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在煤层气钻采和煤炭开采过程中,由煤岩蠕变引起的工程失稳现象时有发生,严重制约了煤层气与煤炭资源的勘探和开发。为深入探讨煤岩的蠕变规律,利用我国煤层气钻采和煤炭开采主要地区-山西晋城地区煤岩进行了蠕变力学实验研究,分析不同轴向荷载条件下煤岩应变与时间的关系。并根据该地区煤岩的蠕变力学特性,构建了适合于该地区的改进西原模型及相应的本构方程。通过实验验证与对比分析:改进的西原模型能更好的反映该地区煤岩蠕变特征,尤其是煤岩所受荷载大于长期强度时效果有显著提升。
During the process of CBM drilling and coal mining, the engineering instability caused by the creep of coal has occurred from time to time, seriously restricting the exploration and development of CBM and coal resources. In order to further explore the law of creep of coal and rock, creep mechanics experiments were conducted on the coal and rock in the Jincheng area, the main area of coal mining in China, and the relationship between coal strain and time under different axial load was analyzed. Based on the creep mechanics characteristics of coal and rock in the area, an improved model of the Western model and corresponding constitutive equations are established. Through experimental verification and comparative analysis, the improved model of Nishihara can better reflect the creep characteristics of coal and rock in the area, especially when the load of coal and rock is greater than that of long-term strength.