岩土力学2017，Vol.38Issue(3)：793-800,8.DOI:10.16285/j.rsm.2017.03.023
深井高应力软岩沿空留巷围岩破坏机制及控制
Failure mechanisms and control of surrounding rock of deep gob-side entry retaining in soft rock strata under high stress
摘要
Abstract
To solve the large deformation problem of deep gob-side entry retaining in soft rock under high stress,lithological characteristics of surrounding rock,failure modes of supporting structure and its evolutionary process are analyzed by the methods of field investigation,theoretical analysis and similar tests.Failure mechanisms of surrounding rock and its control technology are studied systematically.The results show that the large deformation inducements of surrounding rock are weak thick mudstone with softening property and water absorption behavior,as well as its fragmentation,dilatancy and long-term creep in strong disturbance and highly centralized stress state.The cross-section shape of roadway after deformation and failure of surrounding rock is obviously asymmetric in both horizontal and vertical directions.As the original supporting system of surrounding rock does not form into a complete bearing structure,each part of the supporting system is destroyed one by one.The failure sequences of surrounding rock are as following:(1) roof fiacture of backfilling area,(2) backfill fracture under eccentric load,(3) rapid subsidence of roadway roof,(4) external crack drum and rib spalling of solid coal side,and as a result,the instability of the whole surrounding rock occurs.The partitioned coupling support and the quaternity control technology of surrounding rock are proposed,which take the roof of backfilling area as a key link.The technology can improve the overall stability of gob-side entry retaining,avoid support structure instability caused by local failure of surrounding rock,and ensure the safety and smoothness of roadway.关键词
深井沿空留巷/软岩/高应力/破坏机制/围岩控制Key words
deep gob-side entry retaining/soft rock/high stress/failure mechanism/surrounding rock control分类
建筑与水利引用本文复制引用
武精科,阚甲广,谢生荣,谢福星,陈冬冬..深井高应力软岩沿空留巷围岩破坏机制及控制[J].岩土力学,2017,38(3):793-800,8.基金项目
国家自然科学基金项目(No.51574243,No.51504259) （No.51574243,No.51504259）
中央高校基本科研业务费专项资金资助(No.2010YZ02) （No.2010YZ02）
江苏省基础研究计划(No.BK20151145).This work was supported by the National Natural Science Foundation of China (51574243,51504259),the Fundamental Research Funds for the Central Universities(2010YZ02) and the Jiangsu Basic Research Program (BK20151145). （No.BK20151145）
