基于厚硬岩层运动状态的采场应力转移模型及其应用

doi:10.13722/j.cnki.jrme.2019.1118

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摘要针对采场应力转移和厚硬岩层运动之间关系的问题，通过理论分析、数值模拟和微震监测等手段，首先，提出考虑水平应力影响的半封闭厚硬岩层采场空间模型及其平衡条件；其次，研究连续开采条件下覆岩状态及其载荷转移规律；最后，探讨采场竖直方向上水平应力转移机制。主要研究内容和结论：受水平应力影响的半封闭采场空间模型内，工作面开采同时伴随着覆岩破裂运动和应力转移2个过程，厚硬岩层不同运动状态是形成复杂覆岩结构和应力演化的主要原因；依据工作面两侧不同采动环境，划分工作面为首采、单侧沿空、两侧非充分采动、一侧非充分采动一侧充分采动和两侧充分采动等5种类型，分别得到了相应的工作面静态垂直应力大小；考虑水平应力集中影响的采场上覆厚硬岩层结构，得到了采场厚硬岩层水平应力集中估算方法及其拉伸破坏力学表达式。模型应用于5301工作面的开采实践，现场微震监测结果佐证了研究的合理性，并指导了工作面冲击危险性预测和安全开采，成果对相似条件矿井灾害防控具有指导意义。

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	张明1
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	姜福兴3
	陈广尧4
	焦振华1
	胡浩1
	陈宝宝1

关键词 ：采矿工程, 厚硬岩层, 覆岩结构, 采场应力转移, 估算模型, 微震监测

Abstract：Theoretical analysis，numerical simulation as well as microseismic monitoring were used to investigate the relationship between the stress transfer of stopes in the mine and the movement of thick and hard rock strata. Firstly，a space model and its balance condition of the semi-closed thick hard rock stratum considering the influence of the horizontal pressure were proposed. Secondly，the overburden state and load transfer law under continuous mining conditions were studied. Finally，the horizontal stress transfer mechanism in the vertical direction of the stope was discussed. The results show that，in the semi-closed stope space model affected by the horizontal stress，the mining process is accompanied by two processes of overburden rupture and stress transfer，and that the different motion states of thick and hard rock are the main reasons for the formation of complex overburden structure and stress evolution. According to different mining environments on both sides of the working face，the longwall panel is divided into five types such as initial mining panel，panel with one side mined up，panel with two sides not fully mined，panel with one side fully mined and the other side not，and panel with two sides fully mined. The types of the static support stress of the corresponding working face are obtained respectively，and the static abutment pressure corresponding to the panel type was achieved. An estimation method of horizontal stress concentration of overlying thick hard rock stratum was established，and the tensile fracture mode of thick and hard rock layer controlled by the horizontal stress and its mechanical expression were obtained. The model was successfully used in the mining practice of longwall panel 5301. The on-site microseismic monitoring results agrees well with the research which can guide the prediction of rockburst. The results have guiding significance for mine disaster prevention and control under similar conditions.

Key words： mining engineering thick and hard rock strata overburden structure stope pressure transfer estimation model microseismic monitoring

引用本文:

张明1，2，姜福兴3，陈广尧4，焦振华1，胡浩1，陈宝宝1. 基于厚硬岩层运动状态的采场应力转移模型及其应用[J]. 岩石力学与工程学报, 2020, 39(7): 1396-1407.
ZHANG Ming1，2，JIANG Fuxing3，CHEN Guangyao4，JIAO Zhenghua1，HU Hao1，CHEN Baobao1. A stope stress transfer model based on the motion state of thick and hard rock strata and its application#br#. , 2020, 39(7): 1396-1407.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2019.1118 或 http://rockmech.whrsm.ac.cn/CN/Y2020/V39/I7/1396

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