New Type of Similar Material for Simulating the Processes of Water Inrush from Roof Bed Separation

Wang, Zaiyong; Zhang, Qi; Shao, Jianli; Zhang, Wenquan; Wu, Xintao; Zhu, Xianxiang

doi:10.1021/acsomega.0c03535

Cited by 20 publications

(14 citation statements)

References 17 publications

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“…On the other hand, a similar simulation test experiment in the laboratory is also an important means to study the mechanism of water inrush due to bed separation. 17 Wang et al 18 developed a new similar material containing river sand, nano-calcium carbonate, gypsum, and emulsified paraffin. During the test, different lithologic strata were simulated by adjusting the proportions of material components.…”

Section: Introductionmentioning

confidence: 99%

Evaluation on the Risk of Water Inrush Due to Roof Bed Separation Based on Improved Set Pair Analysis–Variable Fuzzy Sets

Zhang

Wang

et al. 2022

ACS Omega

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To study and prevent bed separation water inrush accidents in coal mines, it is necessary to evaluate the risk according to the limited geological data correctly. In this work, based on hydrogeological and mining conditions, we established a risk evaluation model and selected seven important factors, including the aquifer thickness, aquifer water abundance, hydraulic pressure of the aquifer, effective aquifuge thickness, mining failure ratio, mining height of the working face, and advancing distance as evaluation indexes. The intuitionistic fuzzy analytic hierarchy process (IFAHP) and entropy weight method (EWM) were used to analyze the weights of the original data, and the minimum information entropy principle was used to further integrate the abovementioned calculation results. With the weight results, set pair analysis–variable fuzzy set (SPA-VFS) theory was applied to determine the risk grade of each working face, which provided scientific guidance for the safe mining of coal mines. For the working face where water inrush may occur, the risk of bed separation water inrush can be reduced by optimizing the parameters or changing the mining conditions through the model analysis.

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Section: Introductionmentioning

confidence: 99%

Evaluation on the Risk of Water Inrush Due to Roof Bed Separation Based on Improved Set Pair Analysis–Variable Fuzzy Sets

Zhang

Wang

et al. 2022

ACS Omega

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“…The study on gas-water flow in the reservoir is significant for unconventional gas extraction, geological storage of carbon dioxide, and geothermal energy utilization. − There are pore and fracture structures with different development degrees in the reservoir. , A high-permeability pressure environment forms under engineering disturbances such as mining or fracturing. Unsaturated flow such as the water-driven gas and gas-driven water occurs in the reservoir (see Figure a), and the flow process is influenced by the pore distribution of media, roughness, and wettability .…”

Section: Introductionmentioning

confidence: 99%

Seepage Characteristics of Mixed-Wettability Porous Media on the Phase-Field Model

et al. 2022

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Clarifying the microscale gas–water flow behaviors in a mixed wettability reservoir is of great importance for underground engineering. A numerical model of mixed wettability based on circular particles was constructed using the MATLAB stochastic distribution program, and the gas–water flow was simulated based on the phase-field method. The Navier–Stokes equations were solved by the finite element method. The work analyzed the effects of the content of heterogeneous wetting particles, wettability, and inversed wettability of the matrix on the flow path and pressure distribution of the mixed wettability model. Besides, the two-phase flow behaviors were evaluated in microscale mixed-wettability porous media. The simulation results revealed that (i) the residual saturation of the gas phase showed a positive correlation with the hydrophobic particle content, and closed gases only existed in isolated pore channels with small content. Isolated closed gases gradually connected as the content increased. (ii) The residual gas content in the corner and tail end increased as the hydrophobicity of particles increased in hydrophilic matrices. Hydrophobic matrices showed a negative correlation, with the greatest pressure drop due to capillary resistance and step changes in the neutral-hydrophobic transition zone. (iii) Water-phase breakthrough time and gas-phase residual saturation showed a negative correlation change. The more space occupied by the gas phase, the faster the water-phase breakthrough. Moreover, the saturation no longer changes after the breakthrough. The work provides a guideline for determining the dominant flow path of phase displacements and the distribution of residual phases.

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“…However, frequent safety accidents during coal mining hindered the healthy development of coal mining enterprises. Government and enterprises have tried to change such a passive situation by improving safety management measures and introducing rescue equipment, but the accidents and casualties have not been fundamentally resolved [1][2][3]. The relevant accident statistics in 2020 show that 122 coal mines accidents occurred in China.…”

Section: Introductionmentioning

confidence: 99%

Modified Stochastic Petri Net-Based Modeling and Optimization of Emergency Rescue Processes during Coal Mine Accidents

Shi

Wang

et al. 2021

Geofluids

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The coal mine accidents seriously affect the safety and efficiency of mining for coal mining enterprises. The reliable emergency rescue (ER) processes are explored to minimize the loss of accidents. This paper introduces the stochastic Petri net (SPN) and Markov chain (MC) models based on the system structure flow to analyze the ER processes of coal mine accidents. In addition, a triangle fuzzy strategy is presented to optimize the SPN model. The “9·28” major water inrush accident in Shanxi Fenxi Zhengsheng Coal Company of China is adopted to evaluate the time performance and accident data of the ER process. The MC model-based steady-state probabilities of the system under various states are used to calculate the average delay time of this system. The triangular fuzzy strategy is used to analyze the change value of the total time in the ER system at the unit transition speed when the firing rate of each transition is changed, which finds the most time-consuming key activities in the ER process. The results show that SPN and MC can reflect the dynamic behaviors of ER process, which provides a reference for the rescue operations of other coal mine accidents. The triangular fuzzy strategy can quickly find out the key activities affecting the ER time, which greatly decreases the calculations generated by analyzing the total time of the system changed at the unit transition speed.

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New Type of Similar Material for Simulating the Processes of Water Inrush from Roof Bed Separation

Cited by 20 publications

References 17 publications

Evaluation on the Risk of Water Inrush Due to Roof Bed Separation Based on Improved Set Pair Analysis–Variable Fuzzy Sets

Evaluation on the Risk of Water Inrush Due to Roof Bed Separation Based on Improved Set Pair Analysis–Variable Fuzzy Sets

Seepage Characteristics of Mixed-Wettability Porous Media on the Phase-Field Model

Modified Stochastic Petri Net-Based Modeling and Optimization of Emergency Rescue Processes during Coal Mine Accidents

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