含瓦斯煤体水力压裂动态变化特征研究  

Research on Dynamic Characteristics of Hydraulic Fracturing in Coal Body Containing Gas

作　　者：林柏泉[1] 孟杰[1] 宁俊[1] 张萌博[1] 李全贵[1] 刘洋[1] 

机构地区：[1]中国矿业大学煤炭资源与安全开采国家重点实验室,安全工程学院,江苏徐州221116

出　　处：《采矿与安全工程学报》2012年第1期106-110,共5页Journal of Mining & Safety Engineering

基　　金：国家自然科学基金项目(51074161);国家重点基础研究发展计划(973)项目(2011CB201205);煤炭资源与安全开采国家重点实验室自主研究课题项目(SKLCRSM08X03);煤炭资源与安全开采国家重点实验室开放研究基金项目(09KF09)

摘　　要：为了研究煤体水力压裂的破裂机理及动态变化特征,本文以平煤集团十二矿为例建立了相关数学模型,通过数值试验和现场实验,获得了水力压裂过程中裂隙起裂及扩展过程的动态变化特征,即:应力积累→微裂纹稳定扩展→局部破坏带形成→局部破坏带扩展与贯通→裂隙失稳扩展;结合现场实测数据及含瓦斯煤体水力压裂动态变化影响因素分析,建立了煤体埋深、瓦斯压力和水力破裂压力三者耦合模型,研究结果对现场实践具有重要指导意义。To study the hydraulic fracturing mechanism and its dynamic characteristics,taking 12th mine of Pingdingshan Coal Group as example,a related mathematic model was built,and the dynamic characteristics of fracture initiation and extension were gained in the progress of hydraulic fracturing by numerical simulation and field test,which is described as： stress cumulating →micro-cracks steadily developing →partially destroyed area forming →partially destroyed area extension and coalescence →cracks unsteadily developing.Combined with the analysis of onsite measured data and influencing factors of hydraulic fracturing dynamic changes of coal body containing gas,the coupling model which is composed of coal seam depth,gas pressure and hydraulic fracturing pressure is fitted.The results have an important significance to the field practice.

关 键 词：水力压裂 破裂机理 动态特征 数值模拟 

分 类 号：TD712[矿业工程—矿井通风与安全]