Roof Subsidence and Movement Law of Composite Strata Mining: Insights from Physical and Numerical Modeling

Wang, Yongqian; Wang, Xuan; Zhang, Jiasheng; Chen, Xiaobin; Zhu, Wujun; Yu, Zhang

doi:10.3390/min12010003

Cited by 6 publications

(3 citation statements)

References 43 publications

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“…Yu 14 studied the field structure of weak surrounding rock through numerical simulation, orthogonal tests, field observation, and optimization of combined support parameters. Wang 15 used a combination of similar materials and numerical simulation to predict the subsidence of the composite roof. Li 16 studied the instability mechanism of soft rock composite layered roof through theoretical analysis.…”

Section: Introductionmentioning

confidence: 99%

Supporting optimization of thick seam roadway with top coal based on orthogonal matrix analysis

Jia

Fan

et al. 2023

Sci Rep

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Aiming at the problem of large deformation and difficulty in surrounding rock control of the top coal roadway in thick seam, theoretical analysis, theoretical analysis, numerical simulation, orthogonal matrix analysis and other methods were used to study the roof deformation and support parameter optimization of the top coal roadway in thick seam. Firstly, the structural model and roof mechanical model of the top coal roadway in thick seam were established, and the deformation coefficient TK was defined based on the relationship between curvature radius and bending moment, maximum bending moment and ultimate tensile strength of beam. According to the ratio of deformation rate between TK and beam to determine the roof deformation mode of top coal roadway, the discriminant conditions of roadway roof stability under two deformation conditions are obtained. Due to the characteristics of serious coal-rock fragmentation, large roof deformation, and integration of top coal and side coal. Therefore, the combined support method of “high prestressed long and short anchor cables” is proposed by double arch bearing structure control technology. Finally, based on the orthogonal matrix analysis method of supporting parameters optimization of the top coal roadway in thick seam, the analysis amount of supporting scheme is significantly reduced, the comprehensive evaluation of multi-factor and multi-supporting effect of roadway support is realized, and the optimal supporting scheme is obtained. Compared with the surrounding rock of the roadway without support, the deformation of the roof is reduced by 27.27%, the deformation of the two sides is reduced by 45.24%, and the tensile failure volume is reduced by 54.66%. The top coal roadway in thick seam has been effectively controlled, which provides guarantee for high yield and high efficiency of the mine.

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Section: Introductionmentioning

confidence: 99%

Supporting optimization of thick seam roadway with top coal based on orthogonal matrix analysis

Jia

Fan

et al. 2023

Sci Rep

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“…A coal pillar may enter a residual state and the solid coal side of the next panel can become the main bearing body under the abutment load [3]. According to the position of the roof relative to the goaf, the area above the goaf is divided into three regions: a curving zone, a waterconducting fracture zone, and a falling zone [4]. Te efect of lower coal seam pillar stress concentration and surface subsidence gradient decreased as a function of increasing the section coal pillar stagger distance of the upper and lower coal seams, and that a reasonable section coal pillar stagger distance should be more than 40 m [5].…”

Section: Introductionmentioning

confidence: 99%

A Study on the Instability Mechanisms of Coal Pillars in Shallow Coal Seams Group Mining

Tie-lin

Wang

Liu

et al. 2023

Advances in Civil Engineering

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To explore the instability mechanisms of coal pillars in the upper coal during coal seam group mining in the Yulin area and hence to achieve safe and green mining of the lower coal seams, the engineering geological condition for no. 3−1, no. 4−2, and no. 5−2 coal seams in the north-second panel area of Hongliulin Coal Mine was investigated in this article. Using the combination of physical simulation, FLAC3D numerical calculation, and theoretical analysis, the instability mechanisms, the characteristics of the fracture structure, and fracture evolution between the coal pillars and the interval rocks were all studied. The results showed that a layout position existed that induced instability and subsidence of the coal pillars of the upper coal seam. The instability mechanism was such that the concentrated stress of the upper and lower coal pillars caused shear plastic damage in the interval rock along the direction of stress-transfer influence angle. The phenomenon of “inclined step beam” fracture structure, falling fracture zone, and severe mine pressure happened during seam group mining. Furthermore, the minimum center offset formula was put forward to study the instability of the upper coal pillars. This study provides a theoretical basis for a reasonable layout on how to position coal pillars for shallow coal seams group mining.

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“…Fan et al studied the development characteristics of the WCFZ through on-site measurement and physical simulation; they revealed the dynamic evolution characteristic of "developmentdevelopment-closure" of the mining-induced fractures and discovered the "mud cap effect" revealed by mining failure under thick mud caprock [6]. Wang et al proposed a new method and its applicable conditions for the division of the "vertical three zones" of mining overburden based on the key stratum stability and the characteristics of post-fracture movement through physical simulation experiments and the key stratum theory [19,20]. These studies provide good ideas for dividing the WCFZ in the mining overburden under general geological conditions and traditional mining conditions.…”

Section: Introductionmentioning

confidence: 99%

Calculation of the Height of the Water-Conducting Fracture Zone Based on the Analysis of Critical Fracturing of Overlying Strata

Tan

Cheng

et al. 2022

Sustainability

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Accurate division of the water-conducting fracturing zone (WCFZ) in the mining overburden serves as an important basis to evaluate the stability of coal mining under water bodies. Research on the WCFZ is conducive to controlling surface subsidence and realizing safe coal mining under water. Traditionally, the WCFZ is generally determined by field observation (liquid leakage method, borehole television, etc.) or empirical formula. Although these methods boast high accuracy, they are time-consuming and laborious and have some problems such as weak pertinence and a large value range. In this study, a mechanical model under the critical breakage condition of hard and soft strata was established on the basis of the specific geological and mining information of a mine. Besides, the stability condition for the broken strata to form the “masonry beam” structure and the deflection-based bending deformation formula of hard and soft strata were deduced, and the method of calculating the height of WCFZ based on the analysis of critical fracturing of soft and hard strata (hereafter referred to as the CFSHS-based height calculation method) was proposed. Furthermore, with reference to the results of specific engineering tests, the height of the WCFZ in the working face 15,101 of coal mine XJ was analyzed by means of theoretical analysis, numerical simulation and engineering verification, which verifies the rationality and practicability of the CFSHS-based height calculation method.

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Roof Subsidence and Movement Law of Composite Strata Mining: Insights from Physical and Numerical Modeling

Cited by 6 publications

References 43 publications

Supporting optimization of thick seam roadway with top coal based on orthogonal matrix analysis

Supporting optimization of thick seam roadway with top coal based on orthogonal matrix analysis

A Study on the Instability Mechanisms of Coal Pillars in Shallow Coal Seams Group Mining

Calculation of the Height of the Water-Conducting Fracture Zone Based on the Analysis of Critical Fracturing of Overlying Strata

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