大断面软岩硐室稳定性控制技术  

Stability control technology of soft rock chamber with large cross section

作　　者：冯月新[1] 尹乾[2] 许国安[2] 

机构地区：[1]大同煤矿集团有限责任公司,山西大同036005 [2]中国矿业大学深部岩土力学与地下工程国家重点实验室,江苏徐州221116

出　　处：《煤炭科学技术》2016年第1期90-94,共5页Coal Science and Technology

基　　金：国家重点基础研究发展计划(973计划)资助项目(2013CB036003)

摘　　要：为解决大断面软岩巷道控制难度大的问题,基于弹塑性理论,分析了硐室断面尺寸和支护阻力对大断面软岩硐室围岩变形破坏的影响特征。以新上海一号煤矿主井箕斗装载硐室为工程背景,在岩石抗压强度、围岩松动圈厚度和围岩强度测试的基础上,采用FLAC3D有限差分软件对3种不同支护方式下硐室围岩的变形破坏规律和塑性区发育情况进行模拟计算和分析。结果表明:与传统的锚杆索支护相比,锚索+格栅钢筋混凝土联合支护结构具有更好的整体性能,支护后的硐室围岩塑性区和表面变形明显减小。现场工业性试验表明:中室围岩最大内挤变形量仅为5.5 cm,且支护稳定后,围岩应力较小,硐室围岩稳定性得到充分保证。In order to solve the problem of soft rock roadyway with large cross section difficult to control,based on the elastic- plastic theory,the influence of section size of the chamber and the support resistance on the deformation and failure mechanism of the surrounding rock for the soft rock chamber with a large cross section was analyzed. Then,taking the main shaft skip loading chamber of Xinshanghai No. 1Coal Mine in Inner Mongolia as the engineering background,the finite difference software FLAC3 Dwas used to numerically calculate and analyze the deformation law and distribution of plastic zone for the surrounding rock of the chamber under three different supporting schemes on the basis of the measurement of rock strength,loose circle and the strength for the surrounding rock. The results showed that the combined supporting structure of anchor cables and the geogrid reinforced concreted presents a better overall performance compared with the traditional anchor,and the plastic zone and surface deformation of the surrounding rock reduce significantly after supporting. Industrial test indicated that the maximum extrusion deformation of the middle chamber was only 5. 5 cm,and the surrounding rock stress was very low after the stability of the supporting. Therefore,stability and security of the surrounding rock for the chamber were fully insured.

关 键 词：大断面 软岩硐室 围岩稳定性 支护技术 

分 类 号：TD323[矿业工程—矿井建设]