煤层气运移过程中损伤效应对煤强度的弱化影响

doi:10.13722/j.cnki.jrme.2021.0698

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摘要煤层气开采时，基质–裂隙内气体压力相互作用引起煤体出现损伤效应，致使煤的强度降低。为得到损伤效应对煤强度的影响规律，通过提出基质与裂隙几何变形的概念模型进而推导出耦合损伤本构参数的渗透率模型,并通过COMSOL live link with MATLAB程序对考虑气体作用的渗透率模型进行强度后处理计算。结果表明：通过孔隙基本原理得到的渗透率模型适用于不同边界条件，在单轴应变和常应力条件下新模型与试验数据匹配良好，而Palmer-Mansoori(P-M)模型只适用于单轴应变边界条件；与对照煤样相比，在气体作用后杨氏模量比为1/3，1/5，1/7和1/10的煤样强度分别降低了46.6%，32.0%，27.9%和26.4%；气体运移降低煤样强度的机制为损伤效应以损伤–诱导应变贡献于煤的孔隙度，孔隙发育程度改变了单轴加载后主裂隙的扩展轨迹。该研究通过编程对渗透率模型进行后处理计算，实现了煤层气运移出现的损伤效应对煤强度影响的耦合计算。

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	程先振1
	陈连军1
	栾恒杰1
	陈中伟2
	蒋宇静1
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关键词 ：采矿工程, 损伤本构参数, 渗透率模型, 煤层气, 基质&ndash, 裂隙相互作用

Abstract：During coalbed methane mining，the gas pressure interactions within the matrix- fracture cause damage effects in the coal seam，resulting in a reduction on the strength of the coal. To investigate the damage effect of the coal strength，a conceptual model of matrix and fracture geometry deformation was proposed，and then，a permeability model with coupled damage constitutive parameters was deduced. The strength post-processing calculations for the permeability model considering gas action were also carried out by the COMSOL live link with MATLAB program. The results show that the permeability model obtained from the pore fundamentals is suitable for different boundary conditions，and that the new model matches the experimental data well under uniaxial strain and constant stress conditions while the Palmer-Mansoori(P-M) model is only suitable for uniaxial strain boundary conditions. Compared to the control coal samples，the strengths of the samples with Young¢s modulus ratios of 1/3，1/5，1/7 and 1/10 decrease by 46.6%，32.0%，27.9% and 26.4% respectively after gas action. The damage effect of gas transport on the strength of the coal sample contributes to the porosity of the coal in the form of damage-induced strain，and pore development changes the extension trace of the main fracture after uniaxial loading. Post-processing calculations of the permeability model were programmed to realize the evaluation of the damage effect on the coal strength arising from coal bed methane transport.

Key words： mining engineering')" href="#">

mining engineering damage constitutive parameter permeability model coalbed methane matrix-fracture interactions

引用本文:

程先振1，陈连军1，栾恒杰1，陈中伟2，蒋宇静1，3. 煤层气运移过程中损伤效应对煤强度的弱化影响[J]. 岩石力学与工程学报, 2022, 41(3): 503-514.
CHENG Xianzhen1，CHEN Lianjun1，LUAN Hengjie1，CHEN Zhongwei2，JIANG Yujing1，3. Damage effect of coalbed methane transport on coal strength. , 2022, 41(3): 503-514.

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