基于能量耗散的煤岩三轴受压损伤演化特征研究

doi:10.13722/j.cnki.jrme.2020.1133

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摘要在煤矿资源的地下开采工程活动中，煤岩处于轴压、围压和瓦斯气体相互耦合的复杂应力环境。为探究煤岩受压过程中的损伤变形及能量演化特征，利用含瓦斯煤热–流–固耦合三轴伺服渗流试验装置，开展煤岩在不同围压及不同瓦斯压力条件下的三轴压缩试验研究。基于连续损伤力学理论，从能量角度理论推导由非均质威布尔函数、能量耗散函数及塑性应变函数构成的损伤应力–应变函数，并在此基础上建立基于能量耗散的煤岩损伤本构模型。研究结果表明：(1) 不同围压、不同瓦斯压力下煤岩应力–应变变化趋势及塑性变形行为具有阶段性特征。(2) 对应不同的变形破坏阶段煤岩的能量演化趋势呈阶段性变化，应力峰值点处煤岩吸收的总能量随围压的增大而增大，弹性能及耗散能也呈现增大的趋势；随着瓦斯压力的上升，煤岩吸收的总能量和弹性能在应力峰值点处呈下降趋势，耗散能呈上升趋势。(3) 构建围压及瓦斯压力效应下基于能量耗散的煤岩损伤本构模型，并通过试验验证该模型具有较好的合理性。(4) 不同围压及瓦斯压力下煤岩能量耗散与损伤演化均呈“S”型演化趋势。

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	张尧1
	李波波1
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	许江4
	高政1
	陈帅1
	王斌1

关键词 ：采矿工程, 煤岩, 三轴压缩, 能量耗散, 塑性应变, 损伤变形

Abstract：In the underground mining engineering activities of coal resources，coal is in the complex stress environment with the coupling of the axial pressure，the confining pressure and the gas pressure. In order to explore the damage deformation and energy evolution characteristics of coal during the compression process，the triaxial compression test of coal under different confining pressures and different gas pressures is carried out by using a triaxial servo-controlled seepage device. Based on the theory of continuous damage mechanics，the damage stress-strain function composed of heterogeneous Weibull function，energy dissipation function and plastic strain function is deduced theoretically from the angle of energy，and the plastic damage constitutive model of coal based on energy dissipation is constructed. The results show that the change trend of stress-strain and plastic deformation behavior of coal under different confining pressures and different gas pressures have stage characteristics. Corresponding to different deformation and failure stages，the energy evolution trend of coal and rock shows periodic changes. It is also shown that，at the stress peak point，the total energy absorbed by coal as well as the elastic energy and the dissipated energy increases with increasing the confining pressure. However，the total energy absorbed by coal and the elastic energy decrease with increasing the gas pressure，while the dissipated energy increases. A plastic damage constitutive model of coal based on energy dissipation under the effect of the confining pressure and the gas pressure is constructed，and the rationality of the model is verified by experiments. Under different confining pressures and gas pressures，the energy dissipation and damage evolution of coal experience a S type evolution trend.

Key words： mining engineering coal triaxial compression energy dissipation plastic strain damage deformation

引用本文:

张尧1，李波波1，2，3，许江4，高政1，陈帅1，王斌1. 基于能量耗散的煤岩三轴受压损伤演化特征研究[J]. 岩石力学与工程学报, 2021, 40(8): 1614-1627.
ZHANG Yao1，LI Bobo1，2，3，XU Jiang4，GAO Zheng1，CHEN Shuai1，WANG Bin1. Study on triaxial compression damage evolution characteristics of coal based on energy dissipation. , 2021, 40(8): 1614-1627.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2020.1133 或 http://rockmech.whrsm.ac.cn/CN/Y2021/V40/I8/1614

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