过导水断层软岩巷道围岩稳定控制技术  

Surrounding Rock Stability Control Technology of Soft Rock Roadway Passing Water Conductive Fault

作　　者：王俊良 WANG Junliang(Yulin Shenhua Energy Co.,Ltd.,Yulin 719000,China)

机构地区：[1]榆林神华能源有限责任公司,陕西榆林719000

出　　处：《煤矿安全》2020年第12期85-92,99,共9页Safety in Coal Mines

摘　　要：软岩巷道过导水断层破碎带时围岩往往面临着极大的失稳风险。基于此,考虑泥岩与粉砂岩浸水软化影响,采用FLAC^3D对其通过断层时的应力、变形以及破坏特征展开数值模拟分析,并提出了"超前深孔帷幕注浆堵水+局部超前小导管注浆+锚带网索梁"联合支护技术,并对支护后的软岩巷道围岩变形破坏规律进行了对比研究。研究结果表明:当软岩巷道开挖接近导水断层破碎带时,由于顶板泥岩和粉砂岩受断层导水浸泡影响,其拱顶最大沉降以及侧墙水平位移增大约510%以及166%,而围岩塑性区破坏深度增大约0.5~4.6 m,进而导致部分支护结构失效;采用"超前深孔帷幕注浆堵水+局部超前小导管注浆+锚带网索梁"联合支护后,过断层软岩巷道围岩稳定性得到了有效控制,最终拱顶沉降以及侧墙位移均能控制在32 mm以内,而顶板以及两帮的塑性区破坏深度为1.7~2.0 m。When soft rock roadway passes the water conductive fault fracture zone,the surrounding rock often faces grea tinstability risks.Based on this,FLAC^3D is used to perform numerical simulation analysis on the stress,deformation and failure characteristics when it passes through the fault considering the softening effect of mudstone and siltstone by water.And the combined support technology of"advanced deep-hole curtain grouting for water blocking+local advanced small pipe grouting+anchor belt net and cable beam"is proposed,and the deformation and failure law ofsurrounding rock in the soft rock roadway after the support is comparatively studied.The research results show that:when the soft rock roadway is excavated close to the fracture zone of water conductive fault,the maximum settlement of the vault and the horizontal displacement of the side walls are about 510% and 166% higher than that before the immersion because the mudstone and siltstone of the coal roof are affected by the soaking of fault water.While the failure depth of the plastic zone of surrounding rock is about 0.5 m to 4.6 m larger,this leads to the part failure of supporting structure.After adopting the combined support of"advanced deep-hole curtain grouting for water blocking+local advanced small pipe grouting+anchor belt net and cable beam",the stability for surrounding rock in soft rock roadway crossing the fault has been effectively controlled.And the final vault settlement and side wall displacement can be controlled within 32 mm,while the fracture depth of plastic zone is basically 1.7 m to 2.0 m in the roof and two sides.

关 键 词：断层破碎带 软岩巷道 深孔帷幕注浆 锚带网索梁 位移 塑性区 

分 类 号：TD322.4[矿业工程—矿井建设]