极破碎软弱大变形煤岩巷道变形机理及支护技术

发布时间：2018-07-11 12:55

本文选题：大变形 + 煤岩巷道　；参考：《煤炭科学技术》2016年12期

【摘要】：针对复杂条件下软弱煤岩巷道常出现的大变形、支护结构破坏严重等支护控制难题,以贵州木孔煤矿1301综采工作面运输巷为研究对象,通过现场工程调研、室内试验,总结得出了巷道变形失稳机理,针对性地提出了"全锚索(长、短锚索)+金属网+钢带"联合支护优化方案,并运用FLAC3D软件对比分析了其与原方案的支护效果。结果表明:优化方案有效地控制了巷道围岩的各部位变形,且围岩应力较大程度地被释放,形成了较为协调的整体系统。通过现场监测可知:巷道两帮最终累计移近量为327mm,顶底板移近量为239 mm,后期变形移近量较小且趋于稳定状态,而锚索受力在前20 d增加得很快,之后出现下降现象,但最终锚固力趋于一较高的稳定值,进而有效地控制了巷道的大变形破坏问题。
[Abstract]:Aiming at the difficult problems of support control such as large deformation and serious destruction of support structure in soft coal and rock roadway under complex conditions, taking the transportation roadway of 1301 fully mechanized coal face in Mugong Coal Mine of Guizhou as the research object, through field engineering investigation and indoor test, this paper discusses the problems of supporting control. In this paper, the mechanism of deformation and instability of roadway is summarized, and the combined support optimization scheme of "full anchor cable (long, short anchor cable) metal mesh steel belt" is put forward, and its support effect is compared with that of the original scheme by using FLAC3D software. The results show that the optimized scheme can effectively control the deformation of surrounding rock of roadway, and the stress of surrounding rock is released to a large extent, forming a more coordinated whole system. Through field monitoring, it can be seen that the final cumulative movement of the two sides of the roadway is 327mm, the roof and floor is 239mm, the late deformation is smaller and tends to be stable, and the stress of the anchor cable increases rapidly in the first 20 days, and then decreases. However, the anchoring force tends to a higher stable value, which can effectively control the large deformation and failure of roadway.
【作者单位】：湖南科技大学煤矿安全开采技术湖南省重点实验室;贵州渝能矿业有限责任公司木孔煤矿;
【基金】：国家自然科学基金资助项目(51574122) 湖南省教育厅科学研究重点资助项目(14A045) 湖南科技大学研究生创新基金资助项目(S140001)
【分类号】：TD353

【相似文献】