深部开采砌体梁失稳扰动底板破坏力学行为及分区特征  

Floor failure mechanical behavior and partition characteristics under the disturbance of voussoir beam instability in deep coal mining

作　　者：李春元 张勇 左建平[1] 唐世界 刘世峰 LI Chunyuan;ZHANG Yong;ZUO Jianping;TANG Shijie;LIU Shifeng(School of Mechanics and Civil Engineering,China University of Mining and Technology (Beijing),Beijing100083,China;Beijing Key Laboratory for Precise Mining of Intergrown Energy and Resources,China University of Mining and Technology (Beijing),Beijing100083,China;Zhaogu (Xinxiang) Limited Company of Jiaozuo Coal Industrial Group,Henan Energy and Chemical Industry Group Co.,Ltd.,Xinxiang453634,China)

机构地区：[1]中国矿业大学(北京)力学与建筑工程学院,北京100083 [2]中国矿业大学(北京)共伴生能源精准开采北京市重点实验室,北京100083 [3]河南能源化工集团焦煤煤业赵固(新乡)能源有限公司,河南新乡453634

出　　处：《煤炭学报》2019年第5期1508-1520,共13页Journal of China Coal Society

基　　金：国家重点研发计划资助项目(2016YFC0600708);国家自然科学基金资助项目(51622404);中央高校基本科研业务费专项资金资助项目(2011YZ05)

摘　　要：深部开采的强扰动附加属性导致底板煤岩破坏加剧,易沟通底板承压水导升带而诱发突水灾害,故研究砌体梁失稳扰动底板破坏的力学行为可为实现矿山岩层控制提供重要的理论基础。根据弹塑性力学理论分析了深部开采砌体梁失稳扰动底板破坏的动载源特征,基于压力拱及损伤力学理论研究了砌体梁失稳扰动底板压剪破坏和卸荷破坏的力学行为,应用离散元软件计算分析了不同采深下砌体梁失稳扰动底板的应力变化及变形破坏行为,结合采动力学全过程应力-应变曲线获得了深部开采底板强扰动破坏的分区特征,并应用深部开采微震监测数据进行了验证。结果表明:砌体梁失稳后,梁端煤壁端部及触矸区域底板应力增高并形成了塑性屈服区和触矸破坏区,两者之间则形成了压力拱形式的卸荷破坏区;随采深增加,底板塑性屈服区和触矸破坏区的压应力增量及卸荷破坏区的卸荷反弹力不断增大,并使得底板岩体最大变形量在采深700m以浅时近似线性增加,而采深700m以深的深部开采却表现为非线性突变增长;深部开采高围压造成底板压应力峰值及卸荷反弹力非线性增加,促使了扰动岩体由浅部脆性向深部延性的转变,并导致其强扰动破坏的分区范围扩大,变形破坏深度增加,深部开采底板的非线性强扰动破坏行为在底板浅部最突出。Floor failure becomes intensified under the additional property of strong disturbance in deep coal mining,which easily connects hydraulic fractured zone and induces confined aquifer water inrush disasters.Therefore,it can provide an important theoretical basis for realizing strata control in coal mines by the research on floor failure mechanical behavior under the disturbance of voussoir beam instability.According to the elastic-plastic mechanics theory,the dynamic load source characteristic of floor failure under the disturbance of voussoir beam instability in deep coal mining was analyzed.Mechanical behavior of compression-shear failure and unloading failure under the disturbance of voussoir beam instability were studied based on pressure arch theory and damage mechanics.The discrete numerical software was applied to calculate the floor stress change and deformation and failure behavior under the disturbance of voussoir beam instability in different mining depths.Combined with the complete stress-strain relationship of mining-induced mechanical test,strong disturbance failure partitions characteristics of floor in deep coal mining were obtained.Then it carried out verifications by using the mi-croseismic monitoring data of field measurement in deep coal mining.The results show that the stress increases at the coal rib and touching gangues area of the beam end after the main roof beam instability,and plastic yielding zone and touching gangues are formed at the floor,and unloading failure zone is shaped in the middle of them,which appears as the pressure arch shape.With mining depth increasing,the incremental compression stress of floor plastic yielding zone,touching gangues and unloading rebounding stress of unloading failure zone increase grad-ually,which cause the largest deformation of floor rock mass increase approximate linearly with the mining depth less than 700 m,but increase nonlinearly and change suddenly when the mining depth is more than 700 m.High confining pressure of deep coal mining leads to peak

关 键 词：底板岩体 破坏行为 砌体梁失稳 强扰动 深部开采 

分 类 号：TD322[矿业工程—矿井建设]