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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。
According to the laws of thermodynamics, the critical pressure of coal rupture is studied based on the principle of energy. Aiming at the problem of the difference between the critical pressure of hydraulic fracturing coal and the actual situation of hydraulic fracturing using classical elasto-plastic mechanics, First of all, based on the energy release theory, the criterion of coal failure was established. Based on the mechanics analysis of coal seam water injection, the calculation formulas of critical pressure at different starting and fracture sites were discussed. Secondly, taking Pinggang Mine as an example, the critical pressure of coal rupture was calculated by energy principle and classical elasto-plastic mechanics. Finally, the field test results show that: the use of energy principle calculation results more in line with the actual field, while the classical elastoplastic calculation results are relatively large.