Mechanical criteria and sensitivity analysis of water inrush through a mining fault above confined aquifers
Mechanical criteria and sensitivity analysis of water inrush through a mining fault above confined aquifers
复制标题
承压含水层上方采矿断层突水的力学准则和敏感性分析
DOI：
10.1007/s12517-018-4180-4
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发表时间：
2018
影响因子：
--
通讯作者：
Hu Yang
中科院分区：
文献类型：
--
作者：
Sun Jian;Wang Lianguo;Hu Yang
根据矿山压力和岩层控制理论，建立了承压含水层上采煤工作面断层突水的力学模型。基于岩体极限平衡理论，考虑Mohr-Coulomb屈服准则，推导了承压含水层上工作面开采断层突水的力学判据。从含断层采场底板岩层所能承受的极限水压力的力学判据中选取了断层倾角、断层黏聚力、断层内摩擦角、工作面后悬空范围和底板岩层保护带厚度5个影响因素。采用正交试验方法分析了采场底板岩层对断层极限承受水压的敏感性。结果表明，断层倾角和底板保护带厚度对带断层采场底板岩层极限承受水压影响显著，分别占总影响的32.8%和32.5%。断层黏聚力、断层内摩擦角和工作面后悬空范围对断层底板岩层所能承受的极限水压力的影响相似，分别占总影响的10.5%、13.5%和10.7%。采场底板岩层所能承受的极限水压力随断层倾角、断层内摩擦角和工作面后悬空范围的增大而减小，随断层黏聚力和底板岩层保护带厚度的增大而增大。这种特性随着工作面煤壁与断层之间的距离而减小。该研究为工作面开采断层突水机理及其敏感性提供了理论依据，为承压含水层上断层煤层的安全开采提供了理论依据。
A mechanical model of water inrush through a mining fault in the workface above confined aquifers was developed according to ground pressure and strata control theory. Based on limit equilibrium theory of rock mass, mechanical criteria of the water inrush through the mining fault in the workface above confined aquifers were deduced by considering Mohr–Coulomb yield criterion. Five influencing factors, namely fault dip, fault cohesion, fault internal friction angle, suspended goaf range behind the workface, and thickness of floor strata protective zone, were selected from the mechanical criteria of an ultimate hydraulic pressure that the stope floor strata with a fault can tolerate. An orthogonal test was performed to analyze the sensitivity of the ultimate hydraulic pressure tolerated by the stope floor strata with fault. Results show that the fault dip and thickness of the floor strata protective zone significantly influence the ultimate hydraulic pressure tolerated by the stope floor strata with fault and represent 32.8% and 32.5% of the total effects, respectively. The fault cohesion, fault internal friction angle, and suspended goaf range behind the workface exert similar effects on the ultimate hydraulic pressure that the floor strata with a fault can tolerate and comprise 10.5%, 13.5%, and 10.7% of the total effects, respectively. The ultimate hydraulic pressure that the stope floor strata with a fault can tolerate decreases with the increase in the fault dip, fault internal friction angle, and suspended goaf range behind the workface but increases with the fault cohesion and thickness of the floor strata protective zone. This property decreases with the distance between the coal wall of the workface and the fault. This study provides insights into the water inrush mechanism through the mining fault in the workface and its corresponding sensitivity, thereby aiding in establishing the safe mining of coal seam with fault above confined aquifers.
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影响因子：
2.8
作者：
Wancheng Zhu;C. Wei
通讯作者：
Wancheng Zhu;C. Wei
DOI：
10.1016/j.ijrmms.2004.11.010
发表时间：
2005-04
影响因子：
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通讯作者：
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DOI：
--
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影响因子：
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影响因子：
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影响因子：
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作者：
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