中文摘要：

结合室内单轴试验和颗粒流与Fish语言程序对杨村矿煤岩进行了不同围压组合试验,研究双向不等围压煤岩的强度、能量演化机制,并基于能量原理导出能量强度准则。结果表明：随围压比增大,煤岩屈服段对应应变幅宽先增后减,峰后软化段应力降明显,残余强度减小;可释放弹性应变能随应变增加在峰值前不断增大,但增速越来越小,峰后初期快速减小,然后保持较低水平;随围压比增大,煤岩在较大轴向应变下出现内部损伤,高围压比下峰前一定应变范围吸收的能量全部用于内部损伤裂隙形成和扩展所需的表面能,揭示了高围压比要比低围压比煤岩破坏时内部损伤程度严重;高围压比煤岩在较大第一、第二主应力作用下峰后弹性应变能释放更加容易;煤岩弹性储能极限与围压比存在线性变化规律,将弹性储能极限与能量演化结合导出能量强度准则,准则方程包含岩性常数和3个主应力,考虑了岩石破坏的综合因素,计算精度比Hoek-Brown准则和Drucker-Prager准则更具优势,能很好地表达岩石强度特性。

英文摘要：

This article is inclined to introduce its investigation and exploration results of the energy evolutionary mechanism in case of the failure process of the coal and energy yield criteria under the bidirectional unequal confining pressure coal specimens, from Yangcun coal mine, Henan. For the said study purpose, we have tested and analyzed the different confining pressures by using the inside uniaxial compression and PFC strength of the coal and energy evolution mechanism at the bidirectional unequal confining pressure. We have gained the energy yield criterion based on the energy-generation principle and achieved some main study results as follows： the yield stage of the coal seam tends to increase to a peak value and then decrease with the increase of the confining pressure ratio. And, then, there would appear a softening stage immediately when the stress peak tends to be over with the residual strength decreasing with the increase of the confining pressure ratio. And, then, the elastic strain energy would begin to release increasingly with the increase of the strain, though its increasing rate turns to be weaker and weaker. When the mining peak is over, the strain may become less and less quickly at first with a lower remaining tendency going on for a period. And, then, there would appear the coal internal damage as the result of the coal crack at the larger axial strain with the increase of the confining pressure ratio. The energy the coal seam has absorbed may then be converted into the surface energy for the need of the internal damage in a certain strain range before the peak appears under the higher confining pressure, which indicates that the coal internal damage in the failure may tend to be more severe under the higher confining pressure. And, it would come into the elastic strain of the coal seam when the post-peak energy becomes more easily released under the higher confining pressure ratio, there would appear a strain bigger than the first and the second principal stress. Thus, it would be p