Evaluation on the Stability of Vertical Mine Shafts below Thick Loose Strata Based on the Comprehensive Weight Method and a Fuzzy Matter-Element Analysis Model

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

doi:10.1155/2019/3543957

Cited by 12 publications

(9 citation statements)

References 25 publications

(28 reference statements)

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“…There is currently an urgent need for in-depth studies on this new type of water accident, which play an important role in the effective prediction and prevention. Many researchers have conducted extensive studies on these issues to determine the mechanism of overburden strata separation (Figure ), ,,− evaluate the water inrush risk, ,− and propose the corresponding preventative measures. ,,,,,, For example, Cao investigated the influence of faults on the separation strata formation through similar simulation experiments in the laboratory. Lei simulated the propagation of transverse and longitudinal fractures due to strata separation using 3DEC simulation software developed by ITASCA Consulting Group.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2020

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With an increase in the mining depth and breadth of coal mines in China, water inrush accidents from the roof bed separation of a mining face have become more frequent. A similar simulation experiment in the laboratory is an important way to study the dynamic seepage processes of separation water and explore the mechanism of roof bed separation formation. In this study, we develop a new type of similar material to simulate strata separation. The skeleton of this material is made from river sand, while nanosized calcium carbonate, Ca-bentonite, gypsum, and emulsified wax act as additives. These synthetic materials are then used for the compressive strength experiment, the water permeation height experiment, the structural stability experiment, and the microscopic analysis. Besides, a physical experiment is also conducted to verify the effectiveness of this new similar material. This work could provide the scientific basis for the prediction and control of water accidents caused by the separation strata.

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Section: Introductionmentioning

confidence: 99%

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

et al. 2020

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“…The comprehensive weighting method (CWM) is based on the principle of information entropy, which combines the subjective weight method and objective weight method to allocate a more reasonable comprehensive weight. The calculation formulas are as follows 28 , 29 where ω j refers to the value of the comprehensive weight, ω 1 j refers to the value of the subjective weight, and ξ j refers to the value of the objective weight.…”

Section: Research Methodologymentioning

confidence: 99%

Section: Methodsmentioning

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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“…The AHP method is a subjective analysis method, proposed by Saaty, to quantify qualitative factors. It is a method that converts nonquantitative factors into numerical values, followed by a series of pairwise comparisons on the importance of each influencing factor, which are used to calculate the weight of each factor. , The basic procedures are as follows: A hierarchical structure system is established, which can generally be divided into three layers, namely, the target layer, the intermediate classification layer, and the factor layer (Figure ). A judgment matrix (suppose the size is d by d , d ≥ 2 could be smaller than n due to the hierarchy) is established through mutual comparisons among all of the factors.…”

Section: Methodsmentioning

confidence: 99%

Mathematical Evaluation on the Control of Mining-Induced Ground Subsidence in Thick Loose Strata

Wang

Shao

et al. 2021

ACS Omega

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Coal mining under thick loose strata in North China leads to ground subsidence, which is a natural result of hydromechanical coupling (fluid flow coupled with solid deformation). Therefore, the land surrounding the mining areas is greatly damaged. In this study, the combined weight (CW) method and the fuzzy matter-element analysis (FMEA) method were used to analyze and evaluate the control effect of subsiding land. Overall, 20 sets of geological samples were collected from this area. The influencing factors and the corresponding weights for the control effect of subsiding land were comprehensively analyzed, and an FMEA model was built to predict and verify the results. The results showed that (1) the two evaluation indicators with the most significant impact on land reclamation were the degree of integration and the economic and social benefits and (2) among the 20 sets of samples selected, the predicted conclusions of 17 sets were consistent with the actual engineering situations, which led to an accuracy of 85%. In other words, the CW-FMEA model showed good reliability for evaluating the control effect of subsiding land, which can provide scientific references for control and quality evaluations of land subsidence due to coal mining.

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Evaluation on the Stability of Vertical Mine Shafts below Thick Loose Strata Based on the Comprehensive Weight Method and a Fuzzy Matter-Element Analysis Model

Cited by 12 publications

References 25 publications

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

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

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

Mathematical Evaluation on the Control of Mining-Induced Ground Subsidence in Thick Loose Strata

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