Unascertained Measure Model Research Articles

Improved unascertained measure model for risk evaluation of collapse in highway tunnels

Improved unascertained measure model for risk evaluation of collapse in highway tunnels

Developing an evaluation model based on unascertained measurement for evaluation of tunnel squeezing

Tunnel squeezing brought great difficulties to the construction and severely threatened the safety of on-site operators. The researches regarding large deformation evaluation have been widely developed, but actual conditions of tunnels are considerably complex, producing a large variety of uncertainty information existing in the evaluation process. Therefore, we constructed an unascertained measurement model incorporating four membership functions for evaluation of tunnel squeezing based on the collected datasets. Simultaneously, information entropy was introduced to objectively calculate the index importance for each index. For the first group data (GPI), the accuracy associated with four membership functions are 100%, 83.33%, 50%, and 83.33%, respectively, while the accuracy of GPII are 70%、77.5%、67.5%, and 70%, respectively. Linear function and parabolic function show better performance on uncertainty information interpretation according to the classification results. The results revealed that the uncertainty model constructed in this study can enrich the available uncertainty evaluation system.

Risk Monitoring Level of Stope Slopes and Landslides in High-Altitude and Cold Mines

To study the landslide risk of high-altitude and cold stope slopes, the slope deformation index and landslide risk standards at home and abroad for many years were analyzed and summarized. Using the unascertained measurement model, combined with the analytic hierarchy process, using the Dongbang slope of the Beizhan Iron Mine in Hejing County, Xinjiang, as the research object, the detailed geological data of the slope were obtained, and nine factors affecting the landslide risk of the slope were analyzed. When calculating the weight of each factor, the actual situation of the slope was used as the standard, and the weight of each factor was determined by the analytic hierarchy process. Then, the undetermined measurement matrix of the slope was determined by the statistical method combined with the expert scoring results. Finally, an unconfirmed measurement model for landslide risk grade evaluation of the Dongbang slope of the Beizhan Iron Mine was formed, and the landslide risk monitoring grade evaluation was carried out on the slope in the cold area. The results show that the landslide risk monitoring level of the Dongbang slope in Beizhan Iron Mine is grade II, which indicates that there is a possibility of mild landslide risk for the slope in this cold area. The research results can provide a reference for the risk level and risk assessment of high-altitude alpine slopes.

Establishment and Application of Performance Evaluation and Obstacle Diagnosis Model for Regional Water Ecological Civilization Construction

A scientific performance evaluation of the regional water ecological civilization construction and clarifying the obstacle factor are key points to improve the performance of regional water ecological civilization construction theory. This study analyzes the coupling relationship between humans and regional water ecology by applying the thinking logic of "driving force-pressure-state-influence-response-management." The regional water ecological civilization construction performance evaluation index system based on the DPSIRM model was established. Combining the unascertained measurement model and obstacle diagnosis model, the water ecological civilization construction performance of Shizuishan City during the past 10 years was empirically evaluated, and the obstacle factors affecting local construction performance were diagnosed and analyzed. The analytical results reveal the following points:First, the performance of the water ecological civilization construction in Shizuishan City gradually increased annually and revealed three development stages:the site visit and slow improvement (2010-2014), intermediate but fast improvement (2015-2017) and good and fast improvement (2018-2019). Second, each subsystem performance index trend varied, but generally, the fluctuations rose. Third, from 2010 to 2014, the average obstacle degree of the subsystem state, subsystem response, and subsystem pressure reached 58.81%, which became the main obstacles restricting the performance of the local water ecological civilization construction. From 2015 to 2017, the average pressure barrier degree reached 21.73%, which was the most significant obstacle to the construction performance. From 2018 to 2019, the average pressure barrier degree remained the largest obstacle by reaching 24.49%. Lastly, the index barrier of the obstacle degree among the top five factors are primarily distributed in the pressure subsystem. A comprehensive frequency ranking of the obstacles, the irrigation water use coefficient, and the pressure of the water consumption per ten thousand yuan of value-added by industry as a representative subsystem are the key directions to future construction. In this paper, the concepts and methods of the research can provide a theoretical reference for the performance evaluation of regional water ecological civilization construction and its obstacle factor diagnosis analysis.

Research on the Pricing of Chinese Artwork Based on Unascertained Measure and GM (1, N) Model

The Chinese art market has developed rapidly in recent years, but the problem of fuzzy and irregular art pricing has always perplexed the participants in the art market. This article proposes a new idea of dividing the influence factors of artworks according to the static and dynamic dimensions, so as to study the attributes and external factors of artworks and analyse the causes of price fluctuations of artworks better. The pricing model proposed in this paper applies the Unascertained Measure Model to the comprehensive evaluation of static attributes of artworks. In addition, the GM (1, N) Model is constructed by combining the static attribute comprehensive evaluation score with other dynamic influencing factors, so that the model has the characteristics of qualitative and quantitative combination, scientific and objective. Finally, this paper proves the validity of the model through empirical research.

Novel approach to evaluate rock mass fragmentation in block caving using unascertained measurement model and information entropy with flexible credible identification criterion

In recent years, block caving has drawn the attention of many mine enterprises due to the admired extraction rate and lower cost, which can exploit the materials via gravity inflow. At the same time, the limitation of this advanced method cannot be underestimated easily, such as surface subsidence and boulder, usually, the latter leads to the frequent secondary blast and damage of bottom structure. Thus, it is significant and crucial to evaluate the fragmentation before the implement of this method. But, traditional fragmentation assessment model suffers from the complex process of modeling and simulation. In this study, a hybrid model consists of unascertained measurement theory and information entropy was constructed to meet the requirements of this prospective mining method. Considering the influence of various parameters on rock fragmentation at the same time, twenty-three factors (i.e., uniaxial compressive strength, modulus ratio, fracture frequency, aperture, persistence, joint orientation, roughness, infilling, weathering, in situ stresses, stress orientation, stress ratio, underground water, fine ratio, hydraulic radius, undercut height, draw column height, draw points geometry, draw rate, multiple draw interaction, air gap height, broken ore density and undercut direction) were chosen to extract the main characteristics of rock mass samples from the two different mines, namely Reserve North (Chile), Diablo Regimiento (Chile) and Kemess mine (Canada). A new membership function (logarithm curve) was added to eliminate uncertainty results from the low level of knowledge about rock mass properties. Then, information entropy was performed to quantify the impacts of individual index. A credible degree identification criterion (Rη) was also applied to review the sample attributes qualitatively. Ultimately, degree of fragmentation of the three samples was judged easily on the basis of a composite measurement vectors and Rη. The evaluation results showed that the fragmentation grades of Reserve North, Diablo Regimiento and Kemess mine, separately, were “Good”, “Medium” and “Good”. With regard to the excellent performance of this hybrid model, it can be seen as a reliable approach to describe the fragmentation potential during the ore extraction using block caving mining method.

Evaluating rainstorm hazard prevention and mitigation capability in mountainous ecological scenic areas: A case study of the Qinling Mountains, China

Mountainous areas have become tourism hotspots in recent years, at the same time, some tourism safety issues have been revealed. To study rainstorm hazard prevention and mitigation capabilities, four representative scenic areas in the Qinling Mountains of China were selected as research foci for this study. The similar weight method and the unascertained measure model were used to establish an evaluation index, and the weights of indices at all levels were determined. Rainstorm hazard prevention and mitigation capabilities in the four scenic areas and on defferent slopes were then evaluated quantitatively. The results found that : according to the rainstorm hazard prevention and mitigation capabilities, the rankings of these scenic areas from high to low were Taibai Mountain National Forest Park, Cuihua Mountain National Geopark, Huayang Scenic Area, and Jinsixia National Forest Park. The rainstorm hazard prevention and mitigation capability on the north of the Qinling Mountains were higher than on the south slope, and the difference was relatively large. Rainstorm hazard prevention and mitigation capabilities on the eastern and western Qinling Mountains were more similar. These conclusions could provide a reference for regional rainstorm hazard prevention and mitigation measures, as well as sustainable development.

Subgrade Stability Evaluation in Permafrost Regions Based on Unascertained Measurement Model

With regard to the complex and changeable engineering properties of subgrade in the permafrost regions, a stability-evaluating and order-arranging model of subgrade in permafrost regions is established based on the unascertained measurement theory. Subgrades of Qinghai–Tibet Railway in permafrost regions is taken as examples in view of the unique geological environment conditions. Twelve factors, which influence the subgrade stability, are selected as the evaluation indexes and analyzed qualitatively and quantitatively. The grading standard and stability evaluation index system are constructed. Entropy theory is used to calculate the index weights of evaluation factors, and the stability grade of five typical sections in permafrost regions is judged by credible degree recognition criterion. Meanwhile, the stability of permafrost subgrade is sorted according to evaluation sorting values. It is shown that the results offered by unascertained measurement model assessment are consistent with those by the fuzzy evaluation method. Furthermore, the proposed method can take into account the unascertained information in stability evaluation, which provides an effective method for the subgrade stability evaluation in permafrost regions.

Safety evaluation of blasting fly-rock based on unascertained measurement model

Safety evaluation of blasting fly-rock based on unascertained measurement model

A multi-factor comprehensive risk assessment method of karst tunnels and its engineering application

The tunnel collapse, a large deformation of surrounding rock, water and mud inrush are the main geological disasters in the process of tunnel construction. In order to control the above construction risks, the multi-factor comprehensive risk assessment method of karst tunnels is investigated in this study. Firstly, twelve influencing factors are selected as comprehensive risk assessment indexes of the karst tunnel from the aspects of karst hydrogeology and engineering geology conditions, as well as construction factors. The corresponding grading standards of assessment indexes are determined. The tunnel collapse, large deformation of surrounding rock, water and mud inrush, and comprehensive risk assessment index systems are established respectively. Secondly, the unascertained measure analysis for assessment indexes is carried out. The single risk grade and comprehensive risk grade are judged respectively by using credible degree recognition criteria. Thirdly, the most serious geological disaster is ascertained based on the riskiest principle, and then comprehensive risk control theories and technical systems of the karst tunnel can be built. Finally, the established unascertained measure model and the proposed multi-factor comprehensive risk assessment method are applied to the risk assessment of the Yichang-Wanzhou Railway Dazhiping tunnel. The assessment results are in good agreement with the site construction conditions. The research results provide an effective approach for comprehensive risk assessment methods of karst tunnels.

Product design evaluation for product environmental footprint

The majority of product environmental footprints for a product are determined at the design stage of its life cycle, especially in conceptual design. However, it is difficult to achieve the solution evaluation for product environmental footprint with unascertained product information in conceptual design. This paper is devoted to conceptual design evaluation for product environmental footprint using unascertained measure model. After the unascertained measure model based on the Unascertained Mathematical Theory is introduced, the evaluation process of solutions in conceptual design for product environmental footprint based on unascertained measure model is discussed in detail. And the product conceptual design for product environmental footprint integrated with unascertained measure model-based evaluation approach is also proposed. The conceptual design of the offshore wind power installation platform is given as an example, which demonstrates that the methodology is helpful to design evaluation in conceptual design for product environmental footprint.

Unascertained measure model of water and mud inrush risk evaluation in karst tunnels and its engineering application

Water and mud inrush is one of the typical geological disasters during tunnel construction in karst areas. In order to effectively control the water and mud inrush risk and guarantee the safety of tunnel construction, an unascertained measure model of water and mud inrush risk evaluation is established based on unascertained measure theory. First, according to geological factors and engineering factors in tunnel zone, unfavorable geology, formation lithology, ground water level, topography and geomorphology, attitude of rocks, contact zones between soluble rock and non-soluble rock, crack in rock stratum, surrounding rock grade, construction technology level, and management level are selected as risk evaluation indexes of water and mud inrush, which constitutes the index system of water and mud inrush risk evaluation. Through collecting and collating information of typical water and mud inrush examples of karst tunnels, the uncertainty measure function of each evaluation index is obtained based on the measured data. Meanwhile, the index weight of each factor is ascertained by entropy-information theory, and the risk grade of water and mud inrush is judged by credible degree recognition criteria. In engineering application, the water and mud inrush risk of Qiyueshan tunnel is evaluated based on the established unascertained measure model. The results show that: (1) The evaluation results agree well with practical construction situation. (2) The unascertained measure model is scientific and reasonable, which can achieve the risk level evaluation of water and mud inrush systematically. (3) The unascertained measure model provides an effective method for water and mud inrush risk evaluation of karst tunnels, which can be applied to practical engineering.

Evaluation of Sustainable Development of Resources-Based Cities in Shanxi Province Based on Unascertained Measure

An index system is established for evaluating the level of sustainable development of resources-based cities, and each index is calculated based on the unascertained measure model for 11 resources-based cities in Shanxi Province in 2013 from three aspects; namely, economic, social, and resources and environment. The result shows that Taiyuan City enjoys a high level of sustainable development and integrated development of economy, society, and resources and environment. Shuozhou, Changzhi, and Jincheng have basically realized sustainable development. However, Yangquan, Linfen, Lvliang, Datong, Jinzhong, Xinzhou and Yuncheng have a low level of sustainable development and urgently require a transition. Finally, for different cities, we propose different countermeasures to improve the level of sustainable development.

Evaluation on the Express Enterprise's Service Quality of Customers Perception Based on SPSS and Unascertained Measure Model

Evaluation on the Express Enterprise's Service Quality of Customers Perception Based on SPSS and Unascertained Measure Model

Selection of project delivery approach with unascertained model

Purpose – The construction project is implemented under uncertainty environment, and the product of construction is very complex. Selecting a project delivery system/approach is a critical task, which determines the project schedule, quality and investment objectives. The purpose of this paper is to propose a decision-making model for the selection of project delivery system which is based on information entropy and unascertained measure model. Design/methodology/approach – A decision-making model based on information entropy and unascertained set is employed to select project delivery approach. In order to overcome the subjective evaluations from the experts, the theory of “entropy weight” is applied to modify the experts’ subjective weight. The multi-attribute unascertained measure decision making is fitted to deal with the uncertainty information for selection of project delivery system. Findings – The proposed methodology is more comprehensive compared with the previous work, especially in the uncertainty environment. Research limitations/implications – There is some further work that should be considered, such as how to deal with the imprecise and subjective information given by the experts; how to determine the weight of the experts’; finding a set of importance factors influencing the selection of a delivery system is a complex task to further research. Practical implications – The proposed method can help the construction owner to select a most fitted project delivery system of a construction project. Originality/value – A new approach to select project delivery approach is proposed based on information entropy and unascertained set.

Unascertained Measure Evaluation in Financial Distress Prediction of Listed Company

Evaluation system of financial distress prediction of listed company was established base on the non-financial index cooperated with financial index widespread. And the procedure of the application of unascertained measure model to financial distress prediction was stated in brief. We focused on a certain listed company of Harbin city in Heilongjiang Province, the results showed that the financial risk of this company was moderate-warning according unascertained measure model. It was found that the application of unascertained measure model to financial distress prediction of listed company was feasible. Meanwhile, this method solved the problem of the weight which was presented subjective judgment in market evolution, and promoted the market process fairer and more scientific. The unascertained measure model was very worthy of research significance and prospect.

Effect Evaluation of Bench Blasting Based on Unascertained Measurement Model

In order to resolve the uncertainty problem of influence factors in effect evaluation of bench blasting, the effect evaluation model of bench blasting based on uncertainty measurement theory was built, then this model was used to evaluate the bench blasting effect in Hongshuitai flat engineering. The evaluation results show that: the information entropy and confidence identifying criterion were respectively used to ascertain the evaluation index weight and identifying criterion, by these ways, the evaluation results of this model are more objective; and the evaluation index can be selected flexibly according to actual situation, the calculation of evaluation model is simple, so the evaluation results can offer decision basis for blasting workers to make timely adjustment of the blasting scheme.

Safety Evaluation in Emulsion Explosive Continuous Manufacturing Based on Unascertained Measurement Model

In order to resolve the problems that many units are intersect and mutual restraint in the safety evaluation of emulsion explosive continuous manufacturing, the safety evaluation model based on uncertainty measurement theory was built, then this model was used to evaluate the safety of emulsion explosive continuous manufacturing in one explosive industry. The evaluation results show that: the information entropy and confidence identifying criterion were respectively used to ascertain the evaluation index weight and identifying criterion, by these ways, the evaluation results of this model are more objective; and the evaluation units can be selected flexibly according to actual situation, the calculation of evaluation model is simple, so the evaluation results can offer decision basis for explosive industry to make good management.

Evaluation of Non-Coal Mines Safety Emergency Capacity Based on Unascertained Measurement Model

Based on the uncertainty measurement theory, considering evaluation indexes of monitoring, personnel positioning, emergency actions, compressed air self-help, water rescue and communication, a mining emergency combat capability evaluation model is built to solve the difficulty of non-coal mine safety evaluation. This model is proposed to many uncertainty factors of safety evaluation of non-coal mine, according to the actual situation, carries on quantitative analysis, calculates indexes’weight, conducts grade decision by confidence identification criteria, then derives results of non-coal mine safety evaluation. This method is used to evaluate a certain six systems of non-coal mine. Compared with expert appraisal conclusion, the result shows consistency, therefore uncertainty measurement model is reasonable.

Comprehensive Evaluation Method for Ecotype and Safety Performance of Building

The ecotype and safety performance of urban buildings is affected by many factors. The evaluation method of unascertained measure model has been adopted, through analyzing the traits of the evaluating method and building performance indexes. Based on analyzing and researching, a relatively integrated evaluation indexes system has been established in this paper. The advantages and disadvantages of all factors have been shown out through analysis. Through factual application, the viability and maneuverability of this method has been confirmed. At the same time, the analysis results will provide scientific decision-making for improving the ecotype and safety performance of urban buildings.