基于能量原理的水力压裂煤体临界水压的确定  

Determination of Critical Pressure of Hydraulic Fracture Coal Based on Energy Principle

作　　者：朱红青[1] 张民波[1] 顾北方 申翔[1] 雷博龙[1] 

机构地区：[1]中国矿业大学(北京)资源与安全工程学院,北京100083

出　　处：《煤矿安全》2014年第7期142-144,147,共4页Safety in Coal Mines

基　　金：国家自然科学基金资助项目(51074168)

摘　　要：针对采用经典弹塑性力学求解的水力压裂煤体临界水压与现场实际存在较大差别的问题,根据热力学定律,基于能量原理对煤体破裂临界水压进行了研究。首先,采用能量释放的观点建立了煤体破坏准则,结合煤层钻孔注水过程中的力学分析,对不同起裂位置处临界水压的计算公式进行了讨论。其次,以平岗煤矿为实例采用能量原理和经典弹塑性力学分别计算了煤体破裂临界水压。最后,经现场试验结果表明:采用能量原理计算结果更加符合现场实际,而经典弹塑性力学计算结果相对偏大。Aiming at the problem that there was a big difference between the critical pressure of hydraulicfracture coal calculated by the classical elasticplastic mechanics and the actual situation, the critical pressure of coal failure was studied on the basis of the thermodynamics laws and the energy principle. Firstly, the coal failure criterion was established by adopting the viewpoint of energy release and the formulas of critical pressure at different initiation locations were discussed by mechanics analysis for the water injection process of coal seam drilling. Secondly, taking Pinggang Coal Mine as an example, the critical pressure was calculated by using the energy principle and the classical elasticplastic mechanics. Finally, the field test results showed that the critical pressure calculated by the energy principle was consistent with the actual site, and the calculation result of the classical elasticplastic mechanics was relatively larger.

关 键 词：能量释放 水力压裂 临界压力 弹塑性力学 低透气性 

分 类 号：TD713.3[矿业工程—矿井通风与安全]