双巷布置留巷围岩塑性区演化规律及补强支护技术
发布时间：2018-11-11 08:35
【摘要】：为解决红庆梁矿双巷留巷在一次采动后围岩失稳的问题,通过数值模拟对2次采动影响下的主应力差值分布特征及留巷在不同应力阶段下的塑性区特征进行研究。结果表明:留巷围岩主应力差值在一次采动和二次采动影响下经历了5个阶段,且呈现出阶段性增加的特征;留巷围岩在一次采动期间顶板塑性区由1.2 m增大到2.1 m,煤壁帮和煤柱帮塑性区由0.5 m分别增大到2.0 m和1.5m,在受二次采动应力影响后塑性区的扩展呈非对称的特点,顶板塑性区在煤柱帮侧塑性破坏较多,破坏深度可达3.0 m,两帮塑性破坏较对称,塑性破坏范围可达2.5 m。最终提出针对性的补强支护措施,现场应用后围岩顶底板移近量减小了38%,两帮移近量减小了36%,维护了巷道围岩的稳定。
[Abstract]:In order to solve the problem of rock instability of double roadway in Hongqingliang Mine after the first mining, the distribution characteristics of principal stress difference under the influence of two mining motions and the characteristics of plastic zone of retaining roadway under different stress stages were studied by numerical simulation. The results show that the difference of principal stress in the surrounding rock of roadway has experienced five stages under the influence of primary and secondary mining, and has the characteristics of increasing in stages. In the first mining period, the plastic zone of roof increases from 1.2 m to 2.1 m, and the plastic zone of coal wall and pillar increases from 0.5 m to 2.0 m and 1.5 m, respectively. Under the influence of secondary mining stress, the expansion of plastic zone is asymmetrical. The plastic zone of roof has more plastic failure on the side of coal pillar, the depth of failure can reach 3.0 m, the plastic failure of two sections is more symmetrical, and the range of plastic failure can reach 2.5 m. Finally, the corresponding reinforcement and support measures are put forward. After the field application, the rock roof and floor movement is reduced by 38 percent, and the two sides is reduced by 36 percent, thus maintaining the stability of the surrounding rock of the roadway.
【作者单位】： 中国矿业大学(北京)资源与安全工程学院;
【基金】：国家自然科学基金重点资助项目(51234006,51234005)
【分类号】：TD353
，
本文编号：2324328
[Abstract]:In order to solve the problem of rock instability of double roadway in Hongqingliang Mine after the first mining, the distribution characteristics of principal stress difference under the influence of two mining motions and the characteristics of plastic zone of retaining roadway under different stress stages were studied by numerical simulation. The results show that the difference of principal stress in the surrounding rock of roadway has experienced five stages under the influence of primary and secondary mining, and has the characteristics of increasing in stages. In the first mining period, the plastic zone of roof increases from 1.2 m to 2.1 m, and the plastic zone of coal wall and pillar increases from 0.5 m to 2.0 m and 1.5 m, respectively. Under the influence of secondary mining stress, the expansion of plastic zone is asymmetrical. The plastic zone of roof has more plastic failure on the side of coal pillar, the depth of failure can reach 3.0 m, the plastic failure of two sections is more symmetrical, and the range of plastic failure can reach 2.5 m. Finally, the corresponding reinforcement and support measures are put forward. After the field application, the rock roof and floor movement is reduced by 38 percent, and the two sides is reduced by 36 percent, thus maintaining the stability of the surrounding rock of the roadway.
【作者单位】： 中国矿业大学(北京)资源与安全工程学院;
【基金】：国家自然科学基金重点资助项目(51234006,51234005)
【分类号】：TD353
，
本文编号：2324328
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