Gas Pressure Research Articles

РАСЧЕТ ВРЕМЕНИ ИСТЕЧЕНИЯ ВОДОРОДА ИЗ БАЛЛОНА ДЛЯ ОПРЕДЕЛЕНИЯ ХАРАКТЕРИСТИК АВАРИЙНОЙ ВЕНТИЛЯЦИИ

Выполнены расчеты по определению времени истечения водорода и смеси водорода с углекислотой из баллонов емкостью 0,04 м3 при различном начальном давлении газа через отверстия различного размера. Выявлены закономерности влияния различных параметров на время истечения газов. Показано, что при некоторых условиях можно избежать давления взрыва газовой смеси свыше 5 кПа в случае разгерметизации баллона с газом. When determining the room category by explosion and fire hazard, it is assumed that all the contents of the device, cylinder or other equipment completely go into the room, mixed with air, then the mixture explodes. Such a scenario is found the most dangerous. If the room is equipped with emergency ventilation activated by a signal from a fast-acting gas analyser, it is allowed to reduce the mass of flammable gas or vapour when calculating the explosion pressure. When gas in high pressure equipment enters the room, the time of entry depends on the gas quantity, pressure and other properties of the gas. The regulatory documentation for fire safety does not provide recommendations on calculating the gas discharge time from the equipment of the final volume, accompanied by pressure decrease. The purpose of this work is to estimate the gas discharge time from industrial cylinders with a capacity of 0.04 m3 depending on various factors. The task of the work is to calculate the K coefficient in the formula for determining the required air exchange rate of emergency ventilation. To solve this problem, there is considered the discharge of several combustible gases from cylinders with a volume of 0.04 m3 through holes of different diameters at different values of initial gas pressure. It is shown that when hydrogen flows out of a cylinder with an initial pressure of 20 MPa through a hole with a diameter of 4 mm, which corresponds to the full opening of the valve, the discharge time is 26 seconds, and when discharging under the same conditions through a hole with a diameter of 1 mm, the discharge time increases up to 346 seconds. In order to determine the possibility of protecting a room with hydrogen cylinders from an explosion of a hydrogen-air mixture, there were made calculations of explosion pressures values depending on the volume of the room. There are established conditions for the use of emergency ventilation to ensure explosion safety in an accident with a gas cylinder. In order to reduce the explosion pressure for this room to 5 kPa, it is necessary to increase the discharge time up to 300 s (5 minutes). Two ways to increase the flow time are considered: reducing the size of the hole (by inserting a washer into the cylinder valve) and preliminary dilution of combustible gas with incombustible gas when filling the cylinder. It is possible to use both methods at the same time to increase the gas discharge time from the cylinder.

Mechanisms of Stress, Temperature, and Gas Pressure on Gas Transport in Coal: An Apparent Diffusion Coefficient-Based Study

Mechanisms of Stress, Temperature, and Gas Pressure on Gas Transport in Coal: An Apparent Diffusion Coefficient-Based Study

Enhancement of antioxidative potential of mung bean by oxygen plasma irradiation of seeds

The present study aimed to assess the effect of oxygen plasma treatment on the germination rate, growth, and antioxidative activity of mung beans at different pressures and irradiation exposure times. Oxygen plasma was capable of shortening the germination time as well as improving the germination rate at each gas pressure and exposure time compared to control. The germination rate of plasma-treated seeds exceeded 90% within 18 h of seeding compared to 30 h for the control (without plasma treatment). Stem length increased by 25.42 to 52.88% depending on the pressure and exposure time compared to control. Vitamin C content in the stem and root increased from 1.49 to 1.97 and 1.27 to 2.04-fold higher, respectively, depending on the pressure and exposure time compared to control; while in the case of thiol content, it was 1.16 to 2.76 and 1.09 to 2.49-fold higher in the stem and root, respectively. Plasma treatment increased antioxidant potency compared to control. Maximum antioxidant potency was found at 30-min exposure time, although the alterations in pressure did not elicit prominent changes. Plant growth, vitamin C and thiol contents, and antioxidant potency were increased with increasing pressure up to 60 Pa, which then declined with higher pressure. On the other hand, these parameters decreased with a longer exposure time, except for the antioxidants. Thiol and vitamin C contents were associated with plant growth.

THE LIMITING STATE OF A STEEL STRUCTURE UNDER EXTREME THERMOMECHANICAL LOADINGS

Using numerical methods, the problem of determining the strength and limiting state of a steel shell structure under thermomechanical loading is solved. The operating stresses are determined by solving a physically nonlinear boundary value problem for a shell of revolution. The classical theory of shells, based on the Kirchhoff – Love hypotheses, and the method of integrating shell equations with discrete S.K. Godunov orthogonalization are used. By integrating a system of ordinary differential equations at each point of the shell, the meridional and circumferential stresses and the corresponding deformations are calculated. When taking into account the plastic deformation of the material, the boundary value problem becomes nonlinear. The relationship between stress and strain is linearized by the method of additional strains. A limiting state criterion for thin-walled structures is proposed. In the absence of the necessary parameters for the material of construction, interpolation and extrapolation of the experimental data based on neural networks is used. The method uses the example of a muffle, which is a revolution shell structure loaded with an internal excess pressure of a hydrogen-containing gas and a non-stationary thermal field. The muffle is designed for high-temperature annealing of the electrolytic steel, and is made of non-heat-resistant St3 steel, its mechanical properties have not been sufficiently studied at temperatures above 500 °C. However, the operating temperature of the muffle can reach more than 1000 °C. Under the influence of such a thermal load, noticeable residual deformations are formed in the muffle structure and the muffle may lose its load-bearing capacity. For thermomechanical loads, a maximum temperature of 1000 °C is determined at which the limit state occurs and the operation of the muffle is not permissible. A satisfactory agreement was obtained with the actual muffle temperature during operations of 1100 °C, at which the muffle loses its load-bearing capacity.

Numerical computational investigation for energy separation effects of acid natural gas

Vortex tubes are widely applied to the natural gas industries, e.g., for dehydration, decarbonization, pressure regulation, heating, and antifreeze of natural gas, but the natural gas extracted from the gas field may have problems such as pressure fluctuation and CO2 impurities. This investigation focuses on the flow patterns and energy separation processes in vortex tubes driven by acid natural gas through numerical computations. The effects of pressure and acidity on streamline distribution and energy separation are discussed. Furthermore, the energy quality loss of acid gas energy separation process is also evaluated by the thermodynamic method of exergy analysis. There exist stagnation points, secondary flows, and recirculation phenomena in the flow field of acid natural gas, in which the secondary flows near the nozzle directly affect the energy separation. Increasing the inlet pressure and decreasing the CO2 content can increase the input exergy by up to 488.7 W and 109 W, respectively. In addition, the combined graphical method of swirl number and radial temperature difference can curtail the deteriorating effect of carbon dioxide on energy separation. The innovative assessment of flow structure and thermodynamic performance can be useful for optimizing the application of vortex tubes in the natural gas industry.

Performance Assessment of a JF-CP-TFET for Hydrogen Gas Sensing Applications

Abstract In this paper, a junction-free charge plasma tunnel field-effect transistor (JF-CP-TFET) is proposed and analyzed for the first time to sense hydrogen (H2) gas. Using junction-free and charge-plasma approaches, the proposed JF-CP-TFET-based sensor minimizes random dopant fluctuations, a large thermal budget requirement, and complex processes in the semiconductor sensor production process. The sensing performance of the JF-CP-TFET-based gas sensor is demonstrated by analyzing changes in the work function of the gate of palladium (Pd) catalytic metals, which are proportional to the pressure of H2 gas exposed at the metal gate surface. The presence of H2 gas has been demonstrated by variations of the DC/AC parameters of the proposed sensor, such as carrier concentration, energy band, electric field, transfer characteristics, threshold voltage (VTh), and subthreshold swing (SS). The sensitivity of the JF-CP-TFET-based sensor has been evaluated in terms of drain current (IDS), ION/IOFF ratio, VTh, and SS change in the presence and absence of H2 gas molecules. The sensing capabilities of the proposed JF-CP-TFET-based gas sensor demonstrate that it could potentially be employed for H2 gas detection with excellent sensitivity and reliability.

Neural operators for hydrodynamic modeling of underground gas storage facilities

Objectives. Much of the research in deep learning has focused on studying mappings between finite-dimensional spaces. While hydrodynamic processes of gas filtration in underground storage facilities can be described by partial differential equations (PDE), the requirement to study the mappings between functional spaces of infinite dimension distinguishes this problem from those solved using traditional mapping approaches. One of the most promising approaches involves the construction of neural operators, i.e., a generalization of neural networks to approximate mappings between functional spaces. The purpose of the work is to develop a neural operator to speed up calculations involved in hydrodynamic modeling of underground gas storages (UGS) to an acceptable degree of accuracy.Methods. In this work, a modified Fourier neural operator was built and trained for hydrodynamic modeling of gas filtration processes in underground gas storages.Results. The described method is shown to be capable of successful application to problems of three-dimensional gas filtration in a Cartesian coordinate system at objects with many wells. Despite the use of the fast Fourier transform algorithm in the architecture, the developed model is also effective for modeling objects having a nonuniform grid and complex geometry. As demonstrated not only on the test set, but also on artificially generated scenarios with significant changes made to the structure of the modeled object, the neural operator does not require a large training dataset size to achieve high accuracy of approximation of PDE solutions. A trained neural operator can simulate a given scenario in a fraction of a second, which is at least 106 times faster than a traditional numerical simulator.Conclusions. The constructed and trained neural operator demonstrated efficient hydrodynamic modeling of underground gas storages. The resulting algorithm reproduces adequate solutions even in the case of significant changes in the modeled object that had not occurred during the training process. The model can be recommended for use in planning and decision-making purposes regarding various aspects of UGS operation, such as optimal control of gas wells, pressure control, and management of gas reserves.

Study on the influence of gas transmission characteristics of positive pressure beam tube system under graded pressurization

The positive pressure beam tube system addresses issues related to gas composition distortion, concentration variations, and long transmission delays observed in traditional negative pressure systems. It has increasingly become the primary system for early monitoring and warning of coal spontaneous combustion in goaf areas. Nevertheless, there remains a deficiency in comprehensive research concerning critical aspects like gas transmission characteristics and transmission lag time in the positive pressure beam tube system. This study aims to construct an experimental platform for the positive pressure beam tube monitoring system and systematically investigate how the choice of pressurization device, pipe length, pipe diameter, and driving pressure in the transmission pipeline affect gas transmission characteristics. The findings indicate that the most effective pressurization occurs under conditions of two-stage high positive pressure transport, with a driving gas pressure of 0.65 MPa. The optimal diameter for positive pressure gas transmission is 7 mm. Long-distance negative pressure pipelines result in decreased transmission efficiency, necessitating increased output pressure with the lengthening of positive pressure pipelines to maintain efficiency.

Spatiotemporal evolutions of gas pressures in coal seam during gas extraction under mining disturbance

A 3D geometric model is established based on a fluid‒solid coupling model for purpose of identifying the influences of mining disturbances on the distribution of gas pressures in front of a working face during gas extraction. Then, the stress distribution and gas extraction process are simulated using COMSOL software. The spatiotemporal evolutions of gas pressures in front of the working face are analyzed from the dimensions of point, line, surface, and volume. A comparative analysis has been conducted to explore the distribution patterns of gas pressure in fractures and pores. The results show that under mining disturbance, the stresses in front of the working face create a stress-relaxation area, a stress concentration area, and an original stress area. Moreover, a low stress concentration is located near the boreholes. In the early stage of gas extraction, corresponding to the stress distribution, the gas pressures present a depressurization area, pressure concentration area, and almost undisturbed area. As the time increases after mining, the effects of mining disturbances gradually decrease, and the range of the gas pressure concentration area steadily shortens and shifts toward the front of the working face. Under the same temporal conditions, the gas pressure in pores is higher than that in fractures. At the onset of mining, the pore gas pressure is even greater than the initial pressure. Furthermore, during the identical extraction period, the “concentration area” of pore gas pressure is situated farther away from the coal wall of the working face compared to the “concentration area” of fracture gas pressure. These results of the study provide theoretical support for arranging drainage boreholes, enhancing gas extraction efficiency, safeguarding against gas accidents.

Experimental and Numerical Simulation of Flow Modes in Flow Focusing/Blurring Nozzle

The flow mode of the flow focusing/blurring nozzle was studied through experimental and numerical simulation methods. The experimental results indicate that the flow mode of the nozzle can be classified into flow focusing, transition, and flow blurring based on the location of the liquid jet breakup. Numerical simulation studies have found that the transformation of flow mode is mainly related to viscous shear force, gas pressure on the jet surface, and liquid inertia force. The increase in the gas flow rate changes the flow mode by affecting the viscous shear force. The increase in the liquid flow rate changes the flow mode by affecting the liquid inertial force. When the liquid flow rate is high, the increase in the liquid flow rate affects the flow mode by affecting the gas pressure on the jet surface. The study also found that excessive gas flow rates can hinder the flow of liquid inside the nozzle, while excessive liquid flow rates can hinder the breakup of liquid inside the nozzle. Therefore, the normal operation of the flow focusing/blurring nozzle requires ensuring that the gas and liquid flow rates are within the normal range.

Experimental Study on Spectral Response Characteristics and Mechanical State of Coal Based on Artificial Acoustic Signals

With the increase in coal mining depth, the stress and strain state of coal and rock mass affects the formation of dangerous zones of dynamic phenomena. In order to study the relationship between the frequency spectrum characteristics of artificial acoustic signals and the stress state of coal and gas pressure, a test device and system that can generate acoustic signals by mechanical vibration excitation are developed by using the design idea of the unit module. Firstly, the basic mechanical parameters of coal under uniaxial compression are analyzed. On this basis, we use the test device to study the qualitative and quantitative relationships between the relative stress coefficient K value of the coal body and the axial loading stress, whether it contains gas, and the mechanical vibration force. The test results show that when the gas-containing coal and the gas-free coal are subjected to the same external mechanical vibration knocking force to stimulate the artificial acoustic signal test, the relative stress coefficient K value increases first and then decreases with the increase in axial loading stress. The relationship between the relative stress coefficient K and the axial loading stress σ can be expressed in the form of exponential function K=e−Cσ. When the axial loading stress and the external mechanical vibration force are both fixed values, the relative stress coefficient K value of the coal body with gas is smaller than that without gas. When the axial loading stress and gas-bearing pressure of the coal body are both fixed values, the relative stress coefficient K value decreases with the increase in the impact force of the external mechanical vibration. This experimental study can provide a reference for the identification and prediction of dynamic disasters based on artificial acoustic signals.

Numerical investigation of bubble dynamics in ageing foams using a phase-field model

A novel numerical method for simulating liquid foam decay has been developed. This method is based on a phase-field model and captures gas pressure inside the bubbles. It employs an algorithm that includes the spontaneous rupture of foam separating films and coalescence of bubbles. We found that the microstructure evolution in liquid foam in the dry foam limit is predicted. The numerical results demonstrate that the foam ageing dynamics are mapped for the decay process due to successive coalescence events. Moreover, the method is well suited for large-scale microstructure simulations. This allows the investigation of statistical properties of foams, based on the structures’ characteristics at the bubble scale. In summary, the method is effective to gain insight into the impact of fundamental factors controlling the evolution and dynamics of decaying liquid foam.

Investigation of the effects of laser power and gas pressure on the top and bottom HAZ widths in AISI 1040 steels

In this research, AISI 1040 steels, which are extensively used in different manufacturing industries, were used as workpieces to better comprehend the influences of laser beam cutting parameters on workpieces. In this context, such parameters as laser power, gas pressure and cutting speed were established as variable parameters. In present research, unlike the investigations available in the literature, the workpieces that started to be cut in a straight line were stopped 3 mm before the end of the cutting process. Thus, it could be possible to both see and investigate the top and bottom HAZ (Heat Affected Zone) widths occurring just outside the workpieces. Within the scope of the research, especially the top and bottom HAZ widths occurring in workpieces cut with a different method were investigated. At the gas pressure of 0.7 Bar, considering the largest and smallest bottom HAZ width values, it was studied out that the largest bottom HAZ width value (9.23 mm) was 32.83% larger than the smallest bottom HAZ width value (6.95 mm). On the other side, considering the largest and smallest top HAZ width values, it was studied out that the largest top HAZ width value (5.33 mm) was 71.39% larger than the smallest top HAZ width value (3.11 mm). At 1.4 Bar gas pressure, considering the largest and smallest bottom HAZ width values, it was found that the largest bottom HAZ width value (11.47 mm) was 28.19% larger than the smallest bottom HAZ width value (8.95 mm). On the other side, considering the largest and smallest top HAZ width values, it was studied out that the largest top HAZ width value (6.79 mm) was 42.95% larger than the smallest top HAZ width value (4.75 mm). Additionally, considering the largest and smallest average HAZ width values based on gas pressure of 0.7 Bar and 1.4 Bar, it was found that the largest the average HAZ width values were 33.29% and 44.75% larger than the smallest the average HAZ width values, respectively.

On the use of pulsed DC bias for etching high aspect ratio features

Inductively coupled plasmas (ICPs) containing Cl2 are widely used for plasma etching in the semiconductor industry. One common issue during plasma etching is aspect ratio dependent etching (ARDE), which is generally attributed to variation in the flux of etchant species to the bottom of features with different dimensions. Insufficient fluxes of neutral etchants to the bottom of high aspect ratio features can also result in sputtering, which tends to distort the feature profile. This article addresses two issues relevant to Cl2 ICP and plasma etching in these plasmas. First, a comprehensive set of diagnostics is used to validate a model for Cl2 ICP for gas pressure between 3 and 90 mTorr. The plasma diagnostics include microwave resonant hairpin probe-based measurements of electron density, photolysis-calibrated two-photon laser induced fluorescence measurement of Cl density, photo-detachment-based measurement of Cl− density, and laser diode absorption spectroscopy of argon metastable species to measure the gas temperature. Consistent with the experiments, the model shows that the electron density peaks near the center of the chamber at low gas pressure due to rapid diffusion. The electron density peak moves under the coils at higher pressures. Using the validated Cl2 model, we investigate ICPs with rectangular pulsed DC voltage for bias. It is shown that the Cl flux at the bottom of a trench decreases significantly with increasing aspect ratio of the trench. Neutral to ion flux ratio is therefore low at the bottom of higher aspect ratio trenches. The duty cycle of the pulsed bias waveform is found to be an effective means of increasing the neutral to energetic ion flux ratio, which should help with ARDE and sputter reduction.

Spatial filtering and optimal generation of high-flux soft x-ray high harmonics using a Bessel–Gauss beam

In recent years, significant advancements in high-repetition-rate, high-average-power mid-infrared laser pulses have enabled the generation of tabletop high-flux coherent soft x-ray harmonics for photon-hungry experiments. However, for practical applications, it is crucial to effectively filter out the driving beam from the high harmonics. In this study, we leverage the distinctive properties of a Bessel–Gauss (BG) beam to introduce a novel approach for spatial filtering, specifically targeting soft x-ray harmonics, releasing with a high-photon flux simultaneously. Our simulations reveal that by finely adjusting the focus geometry and gas pressure, the BG beam naturally adopts an annular shape, emitting high harmonics with minimal divergence in the far field. To achieve complete spatial separation of the driving beam and harmonic emissions, we pinpoint the optimal gas pressure and focusing geometry, particularly under overdriven laser intensities, for achieving good phase matching of harmonic emissions from short-trajectory electrons within the gas medium when the exact ionization level is higher than the “critical” value. Additionally, we establish scaling relations for sustaining optimal phase-matching conditions crucial for spatially separating the driving laser and the high-harmonic field, especially as the wavelength of the driving laser increases. Furthermore, our analysis demonstrates a substantial enhancement of harmonic yields by at least one order of magnitude compared to a truncated Gaussian annular beam. We also show that under accessible experimental conditions, soft x-ray photon flux up to 1010 photons/s at 250 eV can be achieved. The utilization of the BG beam opens up a promising pathway for the development of high-flux attosecond soft x-ray light sources, poised to serve a wide range of applications.

Optimization of the blow-off efficiency of kerosene adhering to the inner wall of chambers with complex structures

The research objective of this paper is to obtain an efficient space engine chamber wall adherent kerosene blow-off solution, the research methodology uses computational fluid dynamics method and experiments are conducted to verify the numerical calculation accuracy. The effect of gas pressure, gas temperature, ambient temperature, and gas type on the blow-off efficiency was obtained, in which increasing the pressure and temperature of the blow-off gas increased the treatment efficiency by 14.16% and 9.85%, respectively, and the blow-off efficiency was significantly improved. Increasing the operating ambient temperature and changing the type of purge gas increased the treatment efficiency by 4.76% and 5.88%, respectively. Finally, the removal scheme was optimized by increasing the blow-off gas pressure and temperature, and the treatment efficiency of the optimized scheme was improved by 37.5% compared to the original scheme. The findings of this paper provide important guidance for the efficient blow-off off of kerosene adhering to the inner wall of complex structural cavities.

MoS2 Coatings in unsynchronized, dry-running Screw Compressors: Experimental Insights on Operational Efficiency and Durability

Abstract The discourse on unsynchronized, oil-free screw compressors versus their conventional, oil-lubricated counterparts encapsulates a pivotal shift towards more effi-cient and environmentally friendly industrial machinery. By forgoing gears and lubricants, these innovative compressors streamline manufacturing and assembly, while also eliminating the risk of lubricant contamination in the process gas. In this configuration, the torque generated on the gate rotor by the gas pressure is directly conveyed to the main rotor through the interfacing surfaces of the rotors. In the development of compressor technology, a significant improvement is the application of a molybdenum disulfide (MoS2) coating on the primary rotor. This application utilizes the properties of molybdenum disulfide, which is effective in reducing friction and wear under various operational conditions. By applying this coating, there is an anticipated increase in the wear resistance of the rotor, effectively reducing frictional losses during its operation. This reduction in friction is expected to improve the mechanical efficiency of the compressor and extend its operational lifespan. The investigation of contact interactions utilizes a custom-designed test rig, through which effective parameters are analyzed to facilitate conclusions regarding losses and the durability of the coating. Additionally, the geometry within the contact area is tactilely measured, enabling the quantitative determination of wear. Various layer thicknesses, surface roughness levels, and loads are examined in this context.

Dynamic response characteristics of coal/rock during water injection and freezing process under gas atmosphere and its control effect on gas outburst

The freezing method compensates for the defect of sacrificing coal integrity to reduce gas content, which is the case with traditional methods, achieving the improvement of coal body strength while reducing coal seam gas energy storage, improving the safety of coal and gas outburst accidents in deep coal seams during the process of rock cross-cut coal uncovering. This study conducted water injection and low-temperature freezing experiments on coal/rock samples under the gas atmosphere, analyzing the effects of water and temperature on sample temperature, deformation, and gas adsorption and desorption characteristics. The results indicate that water can displace adsorbed gas in coal/rock samples, and the relationship between the gas displacement and the water content of the sample satisfies an improved exponential function. The center temperature Tm of low water content coal/rock samples decreases with time and gradually tends to stabilize, while the Tm of high water content samples experiences a short-term deceleration or stagnation due to the phase transition heat release of water when it drops to around 0 °C. The cooling rate of samples with low water content and no gas is higher and that of rocks is higher than that of coal samples. Coal/rock samples with high water content experience frost heave during the freezing process, but the overall deformation is still dominated by cold shrinkage, and the amount of deformation is negatively correlated with temperature and water. The gas adsorption capacity of coal decreases linearly with the temperature. At the same time, an increase in water content and a decrease in freezing temperature will significantly reduce the gas desorption capacity of coal samples, effectively reducing the gas expansion energy of coal samples, especially the desorption gas expansion energy. In engineering implementation of this method, the ice phase network can fill the coal pores and cracks and improve the mechanical properties of the coal/rock mass, and the gas pressure in the coal seam and stress concentration near the coal rock interface can be reduced by low temperature and cold shrinkage, thereby achieving safe exposure of the coal seam and preventing accidents from occurring.

An analysis of intuitionistic fuzzy sets in risk-based inspection: A case study of hydrogen crack damage in steel tanks under gas pressure

An analysis of intuitionistic fuzzy sets in risk-based inspection: A case study of hydrogen crack damage in steel tanks under gas pressure

Analysis of deformation and failure of sediment particle-surrounding rock structure of salt cavern gas storage under the coupled action of temperature and pressure

When gas is injected or produced in the gas storage of salt cavern, the different effects of thermal stress, gas pressure, sediment particles and brine pressure on the cavity wall of salt cavern may cause large deformation and damage in the surrounding rock, which threatens the safe and stable operation of the gas storage of salt cavern. Therefore, based on FLAC3D-PFC3D coupling method, a numerical model of salt cavern gas storage with sediment particles in consideration of temperature was constructed, and the influence of injection-production time effect, sediment particle size and initial porosity on the deformation and failure of sediment-surrounding rock structure is studied. The results show that the tensile contact force chain of sediment is sensitive to the particle size of sediment, but insensitive to the initial porosity of sediment and injection-production conditions; during gas production, the larger the particle size and initial porosity of sediment particles, the greater the vertical displacement of shallow sediment particles, and the opposite results are obtained during gas injection. With the progress of gas production and gas injection, the absolute value of vertical displacement of the roof of the salt cavern increases gradually, and the plastic failure range of surrounding rock expands; for gas production process, the larger the particle size and initial porosity of sediment, the smaller the algebraic value of vertical displacement of surrounding rock at the top of cavity and the smaller the plastic failure range of surrounding rock. For the gas injection process, the larger the particle size and initial porosity of the sediment, the larger the algebraic value of the vertical displacement of the surrounding rock at the top of the cavity and the larger the plastic failure range of the surrounding rock. The results can provide reference for the reasonable setting of injection-production operation parameters of salt cavern gas storage and ensure the safe and stable operation of underground salt cavern gas storage (USCGS).