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
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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。Abstract: Aiming at the problem that there was a big difference between the critical pressure of hydraulic-fracture coal calculated by the classical elastic-plastic 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 elastic-plastic 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 elastic-plastic mechanics was relatively larger.
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[1] 林柏泉,孟杰,宁俊,等.含瓦斯煤体水力压裂动态变化特征研究[J].采矿与安全工程学报,2012,29(1):106-110. [2] 朱红青,张民波,申健,等.低透气性煤层脉动注水增透机理研究及数值分析[J].煤炭学报,2013,38(z2):343-347. [3] 孙炳兴,王兆丰,伍厚荣.水力压裂增透技术在瓦斯抽采中的应用[J].煤炭科学技术,2010,38(11):78. [4] 李国旗,叶青,李建新,等.煤层水力压裂合理参数分析与工程实践[J].中国安全科学学报,2010,20(12):73-77. [5] 吕有厂.水力压裂技术在高瓦斯低透气性矿井中的应用[J].重庆大学学报,2010,33(7):102-107. [6] 王有熙,邓广哲.煤层注水破坏机理的能量耗散分析[J].西安科技大学学报,2013,33(2):143-148. [7] 谢和平,鞠杨,黎立云.基于能量耗散与释放原理的岩石强度与整体破坏准则[J].岩石力学与工程学报,2005,24(17):3003-3010. [8] 谢和平,彭瑞东,鞠杨.岩石变形破坏过程中的能量耗散分析[J].岩石力学与工程学报,2004,23(21):3565-3570. [9] 王瑞芳,易少凤.能量耗散与释放原理在水压致裂法中的运用[J].河南理工大学学报,2007,26(6):707-711. [10] 覃道雄,朱红青,张民波,等.煤层水力压裂增透技术研究与应用[J].煤炭科学技术,2013,41(5):79. [11] 王渭明,杨更社,张向东,等.岩石力学[M].徐州:中国矿业大学出版社,2009:150-167. [12] 张国华.本煤层水力压裂致裂机理及裂隙发展过程研究[D].阜新:辽宁工程技术大学,2001:31-33. [13] 翟成,李贤忠,李全贵.煤层脉动水力压裂卸压增透技术研究与应用[J].煤炭学报,2011,36(12):1996-2001.
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