Mass Displacement Research Articles

Comprehensive Analysis of Feasibility by Ascending Mining in Coal Mine

In order to study the feasibility of upward mining in a certain coal mine, the mechanical parameters of the coal rock mass were obtained based on on-site investigation and rock mechanics experiments. A numerical model that conforms to the on-site mining layout was established using numerical simulation methods. The stress, displacement, and plastic zone distribution characteristics of the upper coal rock mass at different positions along the X, Y and Z directions after the initial mining of layered coal were analyzed. The critical thickness for tensile failure of the roof during upward mining was calculated using the thick plate theory. A ground penetrating radar was used on site to conduct three-dimensional detection of the fragmentation characteristics of the overlying roof rock. The results show that after the mining of 5# coal, the stress of the overlying roof surrounding rock in the goaf exhibits a dynamic change process of rising peak falling. As the vertical height from the working face increases, the stress in the center of the goaf and around the working face gradually decreases; the displacement distribution extends outwards from the center of the working face, forming a sinking basin with an upward opening in the direction of inclination and direction of the working face. The maximum displacement value is at the bottom of the basin; there is a tensile stress zone above the working face, and the plastic zone has the largest range at the center of the working face direction and inclination. The plastic zone has not evolved to coal 4# and coal 3#; the maximum critical thickness for tensile failure of the roof is 55.4 m, which is much smaller than the actual thickness of 99.82 m on site, and upward mining can be adopted.

DEMOGRAPHIC FACTORS OF ECONOMIC DEVELOPMENT

The history of humankind is closely tied to the problems of population reproduction, changes in its size, and patterns of human settlement. Population in all countries has been growing for millennia. However, in the 20th and 21st centuries, the situation began to change. The article examines certain aspects of the influence of demographic factors on economic processes. An attempt was made to outline the problems of the demographic crisis and demographic explosion in the 21st century. While there is a demographic crisis in the West, the countries of the Global South are mainly experiencing rapid population growth. In modern Europe, the percentage of people of working age is decreasing, while the share of people of non-working age is increasing. A similar situation is observed in Southeast Asian countries, for example, in Japan and South Korea. The demographic situation in Ukraine can also be characterized as a crisis. During the last decades, the population of Ukraine has been rapidly decreasing. On the other hand, in many countries of Asia and Africa, the population continues to grow rapidly. For instance, Africa is the region with the highest total fertility rate. Examples of countries with very high population growth are Niger, Uganda and Mali. Typically, these countries face significant issues with education. The article uses examples from some African (the Democratic Republic of the Congo) and Asian (Bangladesh) countries to demonstrate the varying demographic situations in different regions. It is shown that rapid population growth can contribute to increased crime rates, which often depend on the level of material well-being of the population. Terrorist groups often exploit poverty to recruit young people into illegal activities. It is noted that young people are often prone to radicalism, making a high proportion of young people in the population a risk factor. Rapid population growth in poor countries leads to an increase in the number of migrants, both legal and illegal ones. Wars, famine, and political repression are among the number of factors causing mass displacement of people. In European countries that receive migrants, social dissatisfaction often grows. Imperfect migration policies are often the reason for the rise in popularity of Eurosceptic parties, such as “Alternative für Deutschland” or “Lega Nord”. Using Poland as an example, it is demonstrated that anti-migrant movements can also be directed against Ukrainians. The failures of European countries in their migration policies should be a warning for Ukraine. We believe that our country will have a labour shortage after the end of the war. Therefore, we suggest considering the difference in mentality between ethnic Ukrainians and potential migrants. After all, the priority of the state should be to ensure the safety of Ukrainian citizens.

Geotechnical and Geophysical Characterization of the Aklesal Dablyang Landslide: Implications for Slope Stability

Landslides constitute one of the principal perils in Nepal, particularly within its hilly and mountainous terrains, where a confluence of geological fragility and climatic extremities engenders precarious landscapes. Such hazards precipitate considerable loss of life and property. This investigation centers on the Aklesal Dablyang landslide in Baglung district, a potent menace to local infrastructure, agricultural domains, and human lives. By deploying a synthesis of geotechnical (laboratory-based soil analysis) and geophysical (Electrical Resistivity Tomography (ERT)) methodologies, the intrinsic properties of the soil and rock substrata within the landslide precinct were meticulously examined. The findings reveal that the landslide comprises predominantly loose colluvial deposits with elevated moisture levels, resulting in reduced shear strength and heightened failure susceptibility. The study accentuates the pivotal influence of hydrological phenomena such as surface runoff and groundwater seepage in aggravating slope destabilization. These results underscore the exigency for efficacious risk mitigation strategies to diminish landslide impacts on vulnerable communities. The Aklesal Dablyang landslide exemplifies the intricate interplay of geological and hydrological dynamics within Nepal’s complex topographical context. This research delineates the geotechnical and geophysical determinants of slope stability, highlighting the prevalence of loose colluvial deposits exacerbated by substantial moisture content, which attenuates shear strength and heightens vulnerability to mass movement. ERT analyses divulged a stratigraphy dominated by clayey sand interspersed with cobbles and boulders, which exhibit pronounced susceptibility to mass displacement during intense monsoonal precipitation—a phenomenon exacerbated by climate change. Anthropogenic interventions, including deficient drainage systems and substandard construction methodologies, further destabilize slopes by escalating pore-water pressure and diminishing soil cohesion. The study accentuates the imperative for integrative risk management paradigms, encompassing resilient engineering solutions, hydrological controls, and community collaboration, to bolster resilience against such geo-hazards.

Same, same but different? A Discourse Network Analysis of the EU’s framings of refugee arrivals in 2015 and 2022

ABSTRACT The European Union (EU) experienced two major instances of refugee influx: in 2015, refugees, mainly from Syria, Afghanistan and Iraq fled civil war, persecution, and dire conditions in neighbouring countries and in 2022, Ukrainians fled from Russia’s full-scale invasion. Fusing theoretical insights on framing and crisification of migration, we ask: How do EU actors frame situations of refugee mass influx? Employing a Discourse Network Analysis, we examine EU representatives’ framing of both instances with respect to three analytical foci: (1) who or what they considered to be in crisis, (2) their framing of refugees; and (3) who they saw to be responsible for solving the crisis. We show how, in 2015, EU representatives framed mass displacement predominantly as a crisis at and of Europe’s borders, and refugees as threats to Member States’ public, economic and cultural security. In contrast, in 2022, crisis framings are almost absent or pertain to Ukraine’s – and by extension the EU’s – security. Ukrainian protection seekers are framed as ethnically and culturally similar and their protection as a humanitarian imperative. Our analysis empirically substantiates debates about double standards in refugee governance and draws attention to actor constellations and the factors that shape crisification of mobility.

Efficiency of the dynamic relaxation method in the stabilisation process of bridge and building frame

More and more complex Civil Engineering problems are being considered in computational mechanics with the invention of high-quality computing techniques. In addition, the computational cost and storage requirement for complex and or large structures have increased dramatically, leading to an increased interest in removing the difficulties using any form of parallel computing. The process of applying the preload for parallel computing to any unstable structures is called a stabilising process, such as the Dynamic Relaxation Method (DRM) is one. This method minimises the energy by a simple vector iteration technique, which ultimately leads the structure to a static equilibrium state. The present study aims to highlight the utility of the DRM in the stabilisation process for small structures like building frames and large and or complicated structures such as bridges before actual transient analysis. Therefore, the present manuscript discusses the computational cost, CPU runtime, multiple increases of mass and rigid body displacement of building frames and bridges. The DRM allows an explicit solver to conduct a dynamic analysis by increasing the damping until the kinetic energy drops to a proposed value. The simulation of the DRM starts to find the equilibrium state with minimal dynamic effect, which is required to apply at the beginning of the solution phase to obtain the initial stress and displacement field before the start of the actual analysis.

MAP OF THE EARTH MASSES - ROLE IN THE INVESTMENT PROJECT

Map of the earth masses shows the essence of the vertical planning project by visualizing the anticipated displacement of the land masses within the boundaries of the property. It is the official document through which the designer can determine the amount of land masses for the purpose of their valuation [5]. The article examines the role of the cartogram and modern practices regarding its creation and use in the investment process.

Pitching kinematics have direct and indirect effects on pitch location in NCAA baseball.

Kinematics and release parameters are important factors of throw location, yet an understanding of their relationship has yet to be achieved. This study sought to explore this relationship. Kinematic data were collected for seventy-seven collegiate pitchers. Fifty-seven kinematic parameters were included in path analyses for horizontal (HPL) and vertical plate locations (VPL). Release angles were set as mediating variables (MED) between independent (IV) and dependent (DV) variables. Eleven kinematic variables directly (13 indirectly) affected VPL, while 23 directly affected HPL (10 indirectly). Linear mixed models revealed that lateral trunk flexion at ball release (BR) (R2=.908, BIC=-598, ICC=.528) best explained VPL. Trunk flexion at foot contact (FC) (R2=.944, BIC=-607, ICC=.776), mediolateral centre of mass (COM) displacement at FC (R2=.974, BIC=-573, ICC=.918), and BR (R2=.967, BIC=-593, ICC=.865), and pelvis rotation at BR (R2=.965, BIC=-588, ICC=.895) models were identified for HPL. Results indicate the relationship between pitching kinematics, release conditions, and throw location is complex. Biomechanics can influence release parameters, which in turn impacts throw location. This work may serve to understand better how biomechanics influence performance.

International and temporary protection in EU law: legal frameworks and challenges of practical implementation

The article analyzes the legal foundations for the protection of refugees and internally displaced persons (IDPs) within the context of the European Union (EU) and Ukraine. The focus is on international and European legal instruments that regulate refugee status and provide temporary protection to individuals affected by armed conflicts. The article particularly examines the EU’s Temporary Protection Directive (2001/55/EC) and the Qualification Directive (2011/95/EU) and the Asylum Procedures Directive (2013/32/EU), which harmonize refugee protection across Member States and ensure consistency in asylum procedures establishing legal frameworks for granting protection to those fleeing war, especially in the context of russia’s aggression against Ukraine. The urgency of this article is highlighted by the war in Ukraine, which has led to unprecedented displacement in Europe, testing the capacities of EU Member States and exposing both strengths and gaps in existing legal frameworks. The paper also addresses the evolving nature of international refugee protection and its alignment with human rights doctrines, offering a comprehensive analysis of how international and regional legal standards interact in practice. This article explores how international frameworks for refugee protection, particularly the 1951 Refugee Convention and its 1967 Protocol, have been incorporated into the European Union’s legal system. These international instruments define the rights of refugees and the obligations of states, especially regarding the principle of non-refoulement, which prohibits the return of individuals to countries where their lives or freedom may be at risk. In the EU, these frameworks are primarily integrated through the Common European Asylum System (CEAS) and it’s key component - the Qualification Directive (2011/95/EU), which aligns EU law with international standards on refugee protection. The study emphasizes the importance of procedural safeguards, including fair and transparent asylum processes and special protections for vulnerable groups. In addition, the EU’s Temporary Protection Directive (2001/55/EC) plays a key role in addressing mass displacement, offering immediate protection in situations of crisis. This directive was activated for the first time in 2022 in response to the war in Ukraine, providing a coordinated EU-wide approach to managing the influx of displaced Ukrainians and preventing the collapse of national asylum systems. The article also discusses the legal challenges and issues that the EU and Ukraine face in providing protection and support to refugees and IDPs. The research underscores the importance of coordination between the EU and Ukraine’s legal systems to ensure proper protection for asylum seekers. An essential aspect is the harmonization of approaches and the improvement of the effectiveness of legal mechanisms in response to current global migration challenges. The findings emphasize the need for continued legal collaboration between the parties to create a more comprehensive and consistent system for refugee protection.

Tuberculosis in Times of War and Peace

This chapter provides a comprehensive analysis of tuberculosis (TB) across different historical contexts of war and peace, underscoring the disease’s resilience and adaptability. It highlights the exacerbation of TB transmission due to war-related factors such as mass displacement, malnutrition, and compromised healthcare systems, while also noting periods of peace as opportunities for advancing TB control measures. The chapter examines the impact of major conflicts on TB incidence and management, including World Wars I and II and more recent conflicts like the Ukraine war. It also discusses the evolution of TB control efforts, from the discovery of Mycobacterium tuberculosis to modern strategies against drug-resistant TB, emphasizing the importance of international collaboration and integrated public health strategies to combat this enduring global health challenge.

Center of mass kinematic reconstruction during steady-state walking using optimized template models.

Template models, such as the Bipedal Spring-Loaded Inverted Pendulum and the Virtual Pivot Point, have been widely used as low-dimensional representations of the complex dynamics in legged locomotion. Despite their ability to qualitatively match human walking characteristics like M-shaped ground reaction force (GRF) profiles, they often exhibit discrepancies when compared to experimental data, notably in overestimating vertical center of mass (CoM) displacement and underestimating gait event timings (touchdown/ liftoff). This paper hypothesizes that the constant leg stiffness of these models explains the majority of these discrepancies. The study systematically investigates the impact of stiffness variations on the fidelity of model fittings to human data, where an optimization framework is employed to identify optimal leg stiffness trajectories. The study also quantifies the effects of stiffness variations on salient characteristics of human walking (GRF profiles and gait event timing). The optimization framework was applied to 24 subjects walking at 40% to 145% preferred walking speed (PWS). The findings reveal that despite only modifying ground forces in one direction, variable leg stiffness models exhibited a >80% reduction in CoM error across both the B-SLIP and VPP models, while also improving prediction of human GRF profiles. However, the accuracy of gait event timing did not consistently show improvement across all conditions. The resulting stiffness profiles mimic walking characteristics of ankle push-off during double support and reduced CoM vaulting during single support.

War-related trauma and posttraumatic stress disorder in refugees, displaced, and nondisplaced people during armed conflict in Sudan: a cross-sectional study

BackgroundThe ongoing armed conflict in Sudan has caused mass displacement, affecting mental health. This study aimed to assess the prevalence of posttraumatic stress disorder (PTSD) and trauma among refugees, internally displaced, and nondisplaced people, while also examining the link between displacement type, PTSD severity, and associated factors.MethodsThis cross-sectional study used the Posttraumatic Stress Disorder Checklist for DSM-5 to assess PTSD symptoms and the General Health Questionnaire-28 to evaluate depression. Data were collected from 642 participants, targeting general social media groups for those within Sudan and specific groups for refugees outside the country. Sociodemographic and trauma event data were also gathered. Data analysis was conducted using SPSS, applying one-way ANOVA and independent t-tests to compare PTSD and depression. Binary logistic regression identified associations between sociodemographic factors and PTSD symptoms.ResultsAmong the 642 participants, 46.3% were internally displaced people (IDP), 42.1% were refugees, and 11.7% were non-displaced individuals. Clinically significant PTSD symptoms were identified in 36.6% of the participants. Refugees had a significantly greater percentage of traumatic events (M = 4.31, SD = 2.605, p < .01). Depression symptoms were found to be strongly associated with clinically significant PTSD (p < .001). Factors significantly linked to depression symptoms included female gender (p = 0.015), being single (p = 0.048), younger age (p = 0.036), dissatisfaction with living conditions (p < 0.001), and unemployment (p = 0.021). Dissatisfaction with living conditions also significantly influenced the likelihood of developing PTSD (p < .001).ConclusionThe study found that 36.6% of participants experienced PTSD, with refugees having a 1.4 times greater risk of developing PTSD compared to IDP and non-displaced individuals. Traumatic events were moderately correlated with PTSD symptoms, though non-displaced individuals had higher exposure to such events. These findings highlight the need for targeted mental health interventions, particularly for refugees and those affected by traumatic events. Further research using probability sampling is necessary to confirm these results and inform more effective mental health policies and programs for displaced populations.

Reflections on the shadow carceral state

In 2012 we urged scholars to explore the extension of penal power through the “shadow carceral state.” The shadow carceral state operates through legally hybrid and institutionally serpentine forms that stretch beyond the criminal legal system. Theoretical Criminology's special issue invited us to reflect on the issues we raised in that piece. We are impressed by the transformation of punishment and society scholarship, which has grown deeper and more sophisticated with each wave of activism. Yet it will take more than a thriving subfield to confront the present and likely future: tenacious and expansive carceral and shadow carceral states that are continually deployed to address the compounding global crises of climate change, mass displacement, and structural poverty.

Repatriation via Saigon

The South Korean Vietnam War deployment (1965–73), typically understood as a mercenary expedition, was also an exercise in the management of refugees and other displaced populations. While the South Korean Army managed its own refugee villages in South Vietnam, the overseas dispatch of military labor also promised to ameliorate the problem of mass displacement at home, an ongoing legacy of the Korean War (1950–53). The northern exile writer Sŏnu Hwi (1922–86) was a notable proponent of this vision of the war as a frontier, framing Vietnam as a surrogate for an inaccessible North Korea and an outlet for the social contradictions of Cold War developmentalism in South Korea. Focusing on the embedded novel Wave to the Mekong River (1966–67), this article argues that Sŏnu's expansionist fantasy deviated from official justifications of Vietnam as a war for development. At the same time, it suggests, Sŏnu's ideological equalization of exile and displacement also informed an emergent antiwar literature showing that the deployment aggravated, rather than resolved, the marginalization of mobilized youth.

First Installation of an Optical Ocean-Bottom Seismometer, Cabled Offshore Les Saintes, Lesser Antilles

Abstract The detection and analysis of offshore seismic processes worldwide often require the use of ocean-bottom seismometers (OBSs). However, most OBS deployments are done with stand-alone stations, with data recovery delayed by months. On the other hand, electrically cabled OBS, which allows for real-time monitoring, remains exceptional due to the high cost of manufacturing, installation, and maintenance. Here, we present a new perspective for cabled array of OBSs, using purely optical seismometers, plugged at the end of long fiber-optic cables, aimed at reducing their cost for observatories requesting real-time data. The optical seismometer was developed in the last decade by the École Supérieure d’Électronique de l’Ouest, based on the Fabry–Perot interferometer, tracking at high resolution the displacement of the mobile mass of a mechanical geophone (no electronics nor feedback). A prototype was successfully installed at the top of La Soufrière volcano of Guadeloupe in 2019. We replicated this sensor and installed it 5 km offshore Les Saintes islands, at 43 m depth (Guadeloupe, Lesser Antilles) to characterize the swarm-type activity persistent after the 2004 M 6.3 earthquake (Interreg Caraïbe PREST project). The installation cruise, FIBROSAINTES, was supported by the Flotte Océanographique Française. A plow designed by GEOAZUR carried the cable and was pulled on the seafloor by the vessel ANTEA. The landing cable was connected to the interrogator, with a real-time telemetry to the Institut du Physique du Globe de Paris/Observatoire Volcanologique et Sismologique de Guadeloupe. The OBS has been qualified with local land-based velocity broad band stations. The analysis of local earthquake swarms suggests transient creep on the major normal faults. This successful installation opens promising perspectives for real-time monitoring in on-land or offshore sites, presenting harsh environmental conditions, in which commercial, electrical seismic sensors are difficult and/or costly to install and maintain.

Introduction: Social Protection in a Time of Global Uncertainty

Social protection has established itself as a vibrant policy sector across the global South, and as a pillar of international development cooperation. Social protection features in numerous country policies and development agency strategies, as well as in several Sustainable Development Goals. However, the global context today is characterised by a range of emerging and intensifying challenges and uncertainties, including post-Covid-19 pandemic recovery; the cost-of-living crisis; unprecedented climate change; and rising numbers of protracted wars and political instability, leading to mass displacement and migration. What is the role of social protection in this shifting and uncertain global context? This article highlights challenges and opportunities for social protection at this crossroads moment, under the themes of politics, crises, innovation, and inclusion, as a way of introducing and framing the contributions to this IDS Bulletin. We argue that the need for social protection has never been greater, but its future trajectories need urgent reimagining.

The rotational disruption of porous dust aggregates from ab initio kinematic calculations

The size of dust grains in the interstellar medium follows a distribution where most of the dust mass is made up of smaller grains. However, the redistribution from larger grains towards smaller sizes, especially by means of rotational disruption, is still poorly understood. We aim to study the dynamics of porous grain aggregates undergoing an accelerated rotation, namely, a spin-up process that rapidly increases the angular velocity of the aggregate. In particular, we aim to determine the deformation of the grains and the maximal angular velocity up to the rotational disruption event by caused by centrifugal forces. We precalculated the porous grain aggregate by means of ballistic aggregation analogous to the interstellar dust as input for subsequent numerical simulations. We performed three-dimensional (3D) N-body simulations, mimicking the radiative torque spin-up process up to the point where the grain aggregates become rotationally disrupted. Our simulations results are in agreement with theoretical models predicting a characteristic angular velocity, $ disr $, on the order of $ rad\ $, where grains become rotationally disrupted. In contrast to theoretical predictions, we show that for large porous grain aggregates ($ nm $), the $ disr $ values do not strictly decline. Instead, they reach a lower asymptotic value. Hence, such grains can withstand an accelerated rotation more efficiently up to a factor of 10 because the displacement of mass by centrifugal forces and the subsequent mechanical deformation supports the buildup of new connections within the aggregate. Furthermore, we report that the rapid rotation of grains deforms an ensemble with initially 50:50 prolate and oblate shapes, respectively, preferentially into oblate shapes. Finally, we present a best-fit formula to predict the average rotational disruption of an ensemble of porous dust aggregates dependent on the internal grain structure, total number of monomers, and applied material properties.

FORCED INTERNAL DISPLACEMENT OF THE UKRAINIAN POPULATION: RISKS RAISED BY WAR

The large-scale war forced millions of Ukrainians to leave their homes in search of safety. The mass displacement of the population led to an increase in the level of uncertainty and raised risks for both individuals and the whole of society. This article aims to assess the scale of internal migration in Ukraine during the war and to investigate the impact of this phenomenon on the quantitative and qualitative characteristics of the labor potential and the possibilities of its use. Our assessment of the number of internally displaced persons (IDPs), and our examination of the state of their adaptation and integration in the new territories of residence are based on administrative data about the registration of citizens as IDPs provided by social services as well as the surveys and research findings by international organizations and domestic sociological institutions. We present an overview of individual challenges and risks raised by the forced displacement of the population, and highlight the specific features of their manifestation. In particular, we single out an increase in the demographic burden, a decrease in the number of people of reproductive age, a reduction in the number of jobs, an increase in the burden on the budget, a drop in labor productivity, a loss or reduction in the income of a large part of the population, a limit of access to quality social services, as well as unemployment, deterioration of the quality of employment, increased social vulnerability, and weakening of social cohesion. Risks increase the probability of negative changes that lead to uncertainty, deterioration of the demographic situation, weakening of the stability of the economy, decline in the level and quality of life of the population, deepening of social inequality, growth of social tension, decline in the consumption capacity of the population, complete or partial loss of social ties and jobs. We offer recommendations regarding priorities and specific measures of the national state policy aimed at avoiding risks and minimizing their possible consequences. The implementation of this policy should be focused on establishing legal, economic, and institutional frameworks for easing tensions in the areas of material security and employment, improving the demographic situation as well as the quality and availability of social services, and improving living conditions.

An experiment to measure electromagnetic memory

Abstract We describe an experiment to measure the electromagnetic analog of gravitational wave memory, the so-called electromagnetic (EM) memory. Whereas gravitational wave memory is a residual displacement of test masses, EM memory is a residual velocity (i.e. kick) of test charges. The source of gravitational wave memory is energy that is not confined to any bounded spatial region: in the case of binary black hole mergers the emitted energy of gravitational radiation as well as the recoil energy of the final black hole. Similarly, EM memory requires a source whose charges are not confined to any bounded spatial region. While particle beams can provide unbounded charges, their currents are too small to be practical for such an experiment. Instead we propose a short microwave pulse applied to the center of a long dipole antenna. In this way the measurement of the kick can be done quickly enough that the finite size of the antenna does not come into play and it acts for our purposes the same as if it were an infinite antenna.

How War Is Rebordering Ukraine

Ukraine’s border regions have been long associated with the country’s cultural and linguistic diversity, but also with political cleavages and alternative geopolitical orientations. The annexation of Crimea by Russia and the military conflict in Donbas violently reshaped Ukraine’s eastern borderlands and led to alienation between the two countries. At the same time, the Ukraine-EU Association Agreement and visa-free regime facilitated the growing reorientation of Ukrainian society toward Europe. The 2022 Russian invasion, occupation of further Ukrainian territories and mass displacement intensified these trends. While the war is forging the country together, it is experienced in very different ways in its regions, and these collective experiences will matter for postwar Ukrainian politics.

Stress transfer paths and damage modes of layered coal-rock mass under static loading

In order to explore the distribution characteristics of nonlinear mechanical behavior and the tendency of damage and failure of deep in situ coal-rock mass, a layered composite thin plate coal-rock mass model is established based on thin plate theory and finite element method. The continuity of interlayer stress and displacement is maintained by transfer matrix function, and the maximum shear stress is calculated by Mohr-Coulomb strength criterion. The distribution characteristics of stress, displacement, energy and maximum shear stress of coal-rock mass under static load are obtained. The analysis results are as follows : ① The torsional stress concentration areas of τxz and τyz are formed on the boundary of coal-rock interface, and the principal stress concentration areas of σx, σy and σz are formed in the center and center of the boundary, and the shear stress distribution of τxy is formed on the diagonal line. ② The maximum shear stress of the long axis has a strengthening effect on the shear failure, and each layer forms a stress state of alternating tension-shear-compression-shear. It first destroys in the middle of the coal-rock interface and boundary, and then destroys along the long side and short side. ③ The coal-rock mass presents a ′ X ′ -type shear zone along the radial and axial. The shear failure occurs first, followed by the principal stress compression failure. The cracks are preferentially developed in the direction perpendicular to the minimum principal stress, and the stepped ′ V ′ -shaped failure characteristics are formed under the action of shear and tensile stress.