三轴循环加卸载下深部煤体损伤的能量演化和渗透特性研究

doi:10.13722/j.cnki.jrme.2018.0697

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摘要为了分析煤矿开采过程中煤体损伤的能量演化规律和渗透特性，采用控制围压、加卸载轴压的方式开展三轴循环加卸载渗流试验，分析在不同围压下弹性参数(弹性模量、泊松比)、能量密度随着轴向应变的演化特征，并引入弹塑性材料的损伤变量，进而探讨损伤变量和渗透率的关系。结果表明：在加卸载过程中，进入屈服阶段后，弹性模量开始降低，耗散能密度、耗散能比例以及损伤变量逐渐增大，进入峰后阶段后演化加剧，说明岩石破坏是一个能量耗散的损伤演化过程；以应力屈服点为分界点，屈服前渗透率和损伤变量呈现幂函数关系；屈服后二者具有较好的指数函数关系，并拟合出不同围压下二者的关系公式；渗透率随围压的增加而减小，说明围压对渗透有抑制作用。

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	王向宇
	周宏伟
	钟江城
	张雷
	王超圣
	安露

关键词 ：采矿工程, 循环加卸载, 破坏, 能量演化, 损伤变量, 渗透率

Abstract：In order to analyze the energy evolution and permeability characteristics of coal during the coal mining process，the triaxial cyclic loading and unloading tests were carried out by controlling the confining and axial pressures，and the permeability was measured. The evolution characteristics of elastic parameters(elastic modulus and Poisson?s ratio) and energy densities with the axial strain were analyzed under different confining pressures. A modified damage variable was introduced for this elastoplastic material and its correlation with the permeability was explored. The results show that，during the loading and unloading processes and after entering the yield phase，the elastic modulus begins to decrease，and the dissipated energy density，dissipated energy ratio and damage variable gradually increase，and that in the post-peak period，changes of these parameters develop rapidly. It is also demonstrated that rock damage is an energy-dissipating damage evolution process. Taking the yield point as the demarcation point，the relationship between the permeability and the damage variable can be described by a logarithmical function and an exponent function before and after yielding，respectively，and the fitting formulas were obtained under different confining pressures. The permeability decreases with increasing the confining pressure，which indicates that the confining pressure has an inhibitory effect on permeation.

Key words： mining engineering cyclic loading and unloading destruction energy evolution damage variable permeability

引用本文:

王向宇，周宏伟，钟江城，张雷，王超圣，安露. 三轴循环加卸载下深部煤体损伤的能量演化和渗透特性研究[J]. 岩石力学与工程学报, 2018, 37(12): 2676-2684.
WANG Xiangyu，ZHOU Hongwei，ZHONG Jiangcheng，ZHANG Lei，WANG Chaosheng，AN Lu. Study on energy evolution and permeability characteristics of deep coal damage under triaxial cyclic loading and unloading conditions. , 2018, 37(12): 2676-2684.

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http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2018.0697 或 http://www.rockmech.org/CN/Y2018/V37/I12/2676

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