深部煤岩层复合结构底板破坏机制及应用研究

doi:10.13722/j.cnki.jrme.2021.0654

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摘要为研究平煤矿区深部岩石开采工作面底板岩体破坏机制，在传统的单一岩层底板塑性滑移线场理论基础上，构建三层复合结构底板塑性滑移线场力学模型，推导得出5种工况下底板最大破坏深度理论解；模拟分析不同推进度下底板岩体应力场分布规律及塑性变形特征；最后运用振弦式应变计实时监测十二矿己15–31040岩石开采工作面底板岩体微应变量，得到采面采前–采中–采后底板变形发育形态及破坏域。结果表明：(1) 该工作面底板主动破坏区深度位于中层与下层结构岩层之间，属第三种工况，最大破坏深度理论解为17.08 m；(2) 模拟实验发现了底板岩体破坏与损伤主要集中在开切眼及两巷下方，以塑性滑移破坏形式为主，破坏深度为17.1～17.9 m，且寒灰承压水导升高度小于石炭系底部铝土泥岩厚度，有效隔水层可抵御寒灰水导升；(3) 实测数据显示底板破坏初始位置超前采面7.9 m，以压剪破坏形式为主，临近采面底板岩体进入采空区后转化为拉剪破坏，破坏深度可达16.5～18 m，温度监测显示采动破坏带的下部岩体仍具有良好的抗渗性。理论计算与模拟实验及实测结果相一致，可为相似地质条件下煤岩层开采工作面底板水害防治提供理论指导和实践参考。

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	李昂1
	2
	纪丙楠1
	牟谦3
	王满2
	4
	于振子2
	4
	邓五先5
	李宏跃5
	韩泰然2
	4
	郭壮5

关键词 ：采矿工程, 塑性滑移线场, 复合结构底板, 塑性变形, 微应变

Abstract：To study the failure mechanism of floor rock mass in deep rock mining working faces of Pingmei mining area，a mechanical model of plastic slip line field for three-layer composite structure floor was constructed，and the theoretical solution of the maximum failure depth of the floor under five working conditions was derived on the basis of the traditional plastic slip line field theory of single rock floor. The stress field distribution law and plastic deformation characteristics of floor rock mass under different advance degrees were simulated and analyzed. Finally，vibrating wire strain gauges were used to monitor the micro-strain of floor rock mass in No. 15–31040 rock mining working face of No.12 Mine in real time，and the deformation development pattern and failure domain of the floor before-during-after mining were obtained. The results show that the depth of the active failure zone of the floor of the working face is located between the middle and the lower structural strata，which belongs to the third working condition with the theoretical solution of the maximum failure depth of 17.08 m. According to the simulation experiment，the failure and damage of floor rock mass are mainly concentrated in the open-off cut and under the two lanes at the depth of 17.1–17.9 m，mainly in the form of plastic slip failure. The height of uplift of cold ash confined water is less than the thickness of bauxite mudstone at the bottom of carboniferous system，and the effective waterproof layer can resist the uplift of cold ash water. The measured data reveal that the initial position of floor failure is 7.9 m ahead of the mining face，mainly in the form of compression-shear failure，while that the rock mass near the mining face turns into tensile-shear failure after entering the goaf and the failure depth can reach 16.5–18 m. According to the temperature monitoring，the lower rock mass in the mining failure zone is still impermeable. The theoretical calculation is consistent with the simulation experiment and measured results. The research could provide theoretical guidance and practical reference for prevention and control of floor water disasters in coal and rock mining working faces under similar geological conditions.

Key words： mining engineering plastic slip line field composite structure floor plastic deformation micro-strain

引用本文:

李昂1，2，纪丙楠1，牟谦3，王满2，4，于振子2，4，邓五先5，李宏跃5，韩泰然2，4，郭壮5. 深部煤岩层复合结构底板破坏机制及应用研究[J]. 岩石力学与工程学报, 2022, 41(3): 559-572.
LI Ang1，2，JI Bingnan1，MU Qian3，WANG Man2，4，YU Zhenzi2，4，DENG Wuxian5，LI Hongyue5，HAN Tairan2，4，GUO Zhuang5. Failure mechanism of composite structure floors of deep coal and rock strata and its application. , 2022, 41(3): 559-572.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2021.0654 或 http://rockmech.whrsm.ac.cn/CN/Y2022/V41/I3/559

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