School of Energy and Mining Engineering,China University of Mining and Technology-Beiing

为了解决孤岛工作面下方大巷围岩支护困难问题,基于弹性力学理论对巷道围岩受力进行分析,探讨了巷道围岩塑性区的影响因素,并分析了巷道半径对巷道围岩塑性区的影响,结合计算机数值模拟,对巷道围岩塑性破坏特征与支护技术优化展开研究,分析得出巷道围岩塑性区剪切破坏呈现"X"型特征,基于此,对原有支护方案进行优化设计,沿巷道正中及顶底板左右四角各增打1根长8 m的锚索,综合数值模拟分析与工业性试验监测,结果表明:巷道围岩支护方案优化后可显著降低巷道围岩应力及控制塑性区发育,围岩变形量最大为0.3 m;验证了优化支护方案的可行性,保证了巷道围岩的稳定,改善了孤岛工作面作用下,原支护方案效果需要反复维修,大巷持续变形的现状。

In order to solve the difficult problem of supporting the deep roadway in isolated island working face,base on of elastic mechanics theory to analysis of fo rces in surrounding rock of roadway,the influence factors of the surrounding rock plastic zone of the roadway are obtained,and the influence of roadway radius on the s urrounding rock of the roadway is analyzed.The plastic failure characteristics and the supporting technology of the surrounding rock are studied by means of computer numerical simulation experiment. and the damage of the plastic zone of the surrounding rock of the roadway is analyzed,it is' X" characteristics of type.On the basis of th is,by optimizing the original supporting scheme.numerical simulation analysis and numerical simulation test show that the roadway surrounding rock support scheme ca n obviously reduce the stress of surrounding rock and control the development of plastic area. The feasibility of the optimized support scheme is verified.the stability of the surrounding rock of the roadway is ensured ,and the effect of the original support scheme needs repeated maintenance and the continuous deformation of the roadw ay is improved under the action of the island working face.

国家自然科学基金资助项目(51404270,51774289)；

0 引言
1 工程背景
2 巷道围岩影响因素分析分析及数值模拟
2.1 巷道半径对巷道围岩的影响
2.2 巷道围岩塑性区形态特征
3 优化支护
3.1 下方大巷支护方案优化
3.2 原支护方案与优化支护方案对比研究
4 工业性试验
4.1 原支护方案巷道围岩破坏窥视分析
4.2 优化支护方案后巷道围岩破坏窥视分析
5 结论

王志强,徐春虎,黄鑫,任亚军,仲启尧,高健勋,崔冬雪.孤岛工作面下方大巷围岩支护技术优化[J].煤炭科学技术,2020,48(S1):5-11.