岩-煤-岩组合体破坏特征及冲击倾向性试验研究  

Experimental research on failure characteristics and bursting liability of rock-coal-rock sample

作　　者：牟宗龙[1,2] 王浩[1] 彭蓬[2] 刘振江[1] 杨晓晨[1] 

机构地区：[1]中国矿业大学矿业工程学院,深部煤炭资源开采教育部重点实验室,江苏徐州221116 [2]兖矿集团有限公司博士后科研工作站,山东邹城273500

出　　处：《采矿与安全工程学报》2013年第6期841-847,共7页Journal of Mining & Safety Engineering

基　　金：国家"十二五"科技支撑计划项目(2012BAK09B01);国家自然科学基金项目(51104150);中国博士后科学基金项目(201104609)

摘　　要：为合理评价开采区域的冲击矿压危险程度,分析了岩-煤-岩组合体受载过程中各部分的位移、加速度、刚度及能量等物理参量的演化规律,提出了以煤体峰值后刚度和岩石卸载刚度为基本参量的组合体稳定破坏和失稳破坏的判别条件。结果表明,岩-煤-岩组合体的破坏状态由其中的煤体峰后刚度及顶底板岩石刚度k1,k2对比关系决定,峰值后卸载至煤体曲线刚度变化率满足21 2 1 2k k m/[(k k)u]的点S后,系统不再维持平衡状态,由稳定破坏转为失稳破坏。提出了采用岩-煤-岩组合体破坏过程中顶底板释放和煤体消耗的能量之比参数作为煤岩组合条件下的冲击倾向性评价指标,并对2个矿区7个地点实际样品进行了冲击倾向性测试结果对比分析,其中有2个取样地点的顶底板会影响煤体冲击倾向性评价结果,试验结果表明,采用岩-煤-岩组合体模型比单纯煤样测试结果能更好地反映现场围岩实际条件对冲击危险的影响程度。In order to determine the bursting danger of mining zone, and to solve the limitation of coal and rock＇s bursting liability evaluation criterion, the stiffness values of coal＇s post-peak and rock＇s unloading process are used to evaluate the steady and unsteady failure of rock-coal-rock sample based on the analysis of deformation, acceleration, stiffness and energy variation. The research results indicate that rock-coal-rock sample＇s failure state is determined by the contrast relation of coal＇s post-peak stiff- ness and rock＇s stiffness. There is a point S on the coal＇s stress-strain curve during the unloading process where the stiffness changing ratio satisfies the relation of λ′〉k1k2m/[（k1＋k2）u^2], after which the rock-coal-rock sample＇s shall not keep the balance state, and the sample＇ s failure will convert from sta- ble to instable state. The parameter a which is the ratio of the energy that roof and floor releases to that of coal releases is used as the index of bursting liability of rock-coal-rock sample. The results of seven sites＇ samples from 2 mines indicate that there are 2 samples＇ burstin. liability is under the influence of roof and floor attribution. The model of rock-coal-rock sample can reflect the bursting liability of in-situ surrounding rock more accurately than that of only coal.

关 键 词：冲击矿压 冲击倾向性 岩-煤-岩组合体 失稳破坏判别 

分 类 号：TD324[矿业工程—矿井建设]