冲击倾向煤岩纵波波速与应力关系试验研究  

Experimental Study on the Correlation Between Stress and P-Wave Velocity for Burst Tendency Coal-Rock Samples

作　　者：巩思园[1,2] 窦林名[2] 徐晓菊[3] 何江[2] 陆菜平[2] 贺虎[2] 

机构地区：[1]中国矿业大学信息与电气工程学院,江苏徐州221116 [2]中国矿业大学煤炭资源与安全开采国家重点实验室,江苏徐州221116 [3]徐州工程学院信电工程学院,江苏徐州221008

出　　处：《采矿与安全工程学报》2012年第1期67-71,共5页Journal of Mining & Safety Engineering

基　　金：国家重点基础研究发展计划(973)项目(2010CB226805);江苏高校优势学科建设工程项目;江苏省博士后科研计划项目(1002004B);煤炭资源与安全开采国家重点实验室自主研究课题项目(SKLCRSM10X05);教育部新世纪优秀人才支持计划项目(NCET-10-0769);江苏省研究生科研创新计划项目(CX08B_124Z)

摘　　要：为了弄清煤矿中冲击矿压现象的发生机理,在实验室单轴条件下对冲击倾向性煤岩样的应力与纵波波速耦合关系进行了研究,建立了两者关系的试验模型,并对模型参数进行了分析。研究结果表明:1)岩样纵波波速对应力的敏感程度要高于煤样,即随应力增加,纵波波速变化更快;2)冲击倾向煤岩试样在弹性阶段纵波波速变化梯度大,塑性阶段波速变化趋于平缓,它表明应力与纵波波速间具有幂函数关系,与实测值的相关系数计算说明,模型具有较高的拟合度,能准确描述应力与波速的变化关系,并服务于现场层析成像冲击危险性计算。To explore the mechanism of rockburst,we established the experimental model between stress and P-wave velocity for burst tendency coal and rock samples from deep coal mine under the uniaxial loadings,and analyzed the parameters of the derived model.The results show that：1） the P wave velocity in rock sample changes more sensitively than that in coal sample under loadings,which means the P wave velocity in rock sample changes more quicker with the increase of stress;2） the velocity gradient of the sample is usually high at the elastic stage and then begins to level out at the plastic stage under the uniaxial loading,which shows that a power function is exist between the P-wave velocity and stress.The calculated correlation coefficients to measured value show that the experimental model has high fitness,and can be well used to describe the stress distribution and identify the risk level of rockburst in mines.

关 键 词：单轴 冲击倾向 煤岩样 应力 纵波波速 试验关系模型 

分 类 号：TD324[矿业工程—矿井建设]