基于连续实测的煤巷围岩掘-采期间采动应力演化与破坏模式分析  

Analysis on mining-induced stress evolution and surrounding rock failure mode of roadway during heading-mining period based on continuous measurement

作　　者：苏超 康红普 姜鹏飞 刘畅 刘跃东 伊康 SU Chao;KANG Hongpu;JIANG Pengfei;LIU Chang;LIU Yuedong;YI Kang(College of Mining Technology,Taiyuan University of Technology,Taiyuan,Shanxi 030024,China;Coal Mining Research Institute,China Coal Technology and Engineering Group Co.Ltd.,Beijing 100013,China;State Key Laboratory of Intelligent Coal Mining and Strata Control,Beijing 100013,China)

机构地区：[1]太原理工大学矿业工程学院,山西太原030024 [2]中煤科工开采研究院有限公司,北京100013 [3]煤炭智能开采与岩层控制全国重点实验室,北京100013

出　　处：《岩石力学与工程学报》2024年第9期2201-2213,共13页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家重点研发计划(2023YFC2907600);国家自然科学基金资助项目(52104091)。

摘　　要：采动应力是煤矿开采各类地质灾害的根本驱动力之一,为掌握煤巷围岩掘进和回采期间采动应力演化规律,采用空心包体应力测量技术,在陕西陕煤曹家滩矿业有限公司122110工作面辅运巷首次通过连续监测,获取了煤巷围岩掘-采期间采动应力演化数据,提出基于空心包体应变计连续监测计算应力全量的方法,并基于莫尔-库仑准则对实测数据进行有效性判定,揭示了掘进与回采影响下巷道围岩采动应力的动态变化规律,并通过应力比K对巷道围岩破坏模式进行讨论。研究结果表明:掘进及回采期间的超前采动应力影响范围分别为8和110 m,最大与最小主应力差值分别提升0.17和1.58倍,回采期间提升值为掘进期间的9.3倍;掘进期间围岩破坏模式主要为表层围岩张拉破坏,回采期间则发生较大范围的塑性破坏,其中浅部围岩主要发生张拉破坏,中浅部围岩发生拉-剪复合破坏,深部区域一般较少发生破坏;结合实测数据、钻孔窥视结果与现场破坏特征,验证了应力比K能够较好反映巷道围岩应力状态与破坏模式之间的关系。Mining-induced stress is one of the fundamental driving force of geological disasters in coal mining.In order to master the evolution law of mining-induced stress of surrounding rock during heading and mining period,hollow inclusion stress measurement technology was employed to obtain the full-cycle stress evolution data of the 122110 working face auxiliary roadway from the heading to the end of mining for the first time,in the Shaanxi Coal Caojiatan Mining Co.,Ltd.A method for calculating the full amount of stress based on continuous monitoring of hollow inclusion strain gauges was proposed,and the validity of the measured data was determined based on the M-C criterion.The dynamic change law of the mining-induced stress in the surrounding rock under the influence of heading and mining was revealed,and the failure mode of the roadway surrounding rock was discussed using the stress ratio K.The research results show that the influence range of advance mining-induced stress during heading period and mining period was 8 m and 110 m,respectively,and the difference between maximum and minimum principal stress increases 0.17 and 1.58 times,respectively.The increase value during mining period was 9.3 times of that during heading period.The failure mode of surrounding rock was mainly tensile failure of surface surrounding rock during heading period,and plastic failure occurred in a large range during mining period,in which the shallow surrounding rock is mainly tensile failure,the middle surrounding rock is tension-shear composite failure,and the deep area is generally less failure.The comprehensive field-measured data,drilling results,and in-situ failure characteristics indicate that the stress ratio K can better reflect the relationship between the stress state and the surrounding rock failure mode of the mining roadway.

关 键 词：采矿工程 煤巷 采动应力 掘-采期间 破坏模式 

分 类 号：TD32[矿业工程—矿井建设]