采气–采煤阶段煤岩渗透率演化机制研究

doi:10.13722/j.cnki.jrme.2021.0482

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摘要为模拟煤矿现场先采气后采煤的作业过程，利用含瓦斯煤热–流–固耦合三轴伺服渗流装置，开展孔隙压力减小的煤岩渗流试验和全应力–应变–渗流试验。通过推导温度升高时煤岩裂隙宽度变化的表达式，进一步构建考虑温度–应力的煤岩渗透率模型，探讨温度与应力作用下煤岩瓦斯渗流演化机制。新建的煤岩渗透率模型包括有效应力、吸附/解吸、热膨胀及热裂四部分影响因素，并使用损伤变量表征裂纹扩容过程中产生的基质膨胀效应(热裂)，结果表明：(1) 当外应力恒定时，不同温度下渗透率随孔隙压力减小先略有减小而后迅速增大；当孔隙压力恒定时，渗透率随温度增大整体呈先减小后增大的趋势。(2) 在煤岩全应力‐应变–渗流试验过程中，渗透率随轴向应力的增大呈先减小后增大的趋势；煤岩弹性模量及峰值强度与温度之间呈负相关关系。(3) 新建渗透率模型的计算值和实测值基本一致，可较好表征渗透率随孔隙压力及有效应力的演化规律。(4) 基于内膨胀应力的定义，探讨温度与应力作用过程中内膨胀变形对渗透率的贡献。在温度恒定时，渗透率随内膨胀因子的增大而减小；煤岩裂隙宽度与损伤相关，在温度突变系数增大过程中渗透率随之减小。

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	贾荔丹1
	李波波1
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	李建华1
	高政1
	许江4
	吴学海1

关键词 ：采矿工程, 煤岩, 采气, 采煤, 渗透率, 温度

Abstract：In order to simulate the operation process of gas mining first and then coal mining on site，the gas-containing coal thermal-fluid-solid coupling triaxial servo seepage device was used to conduct coal seepage tests under reduced pore pressure and full stress strain-seepage tests. By deriving the expression of the change in the width of coal cracks when the temperature rises，a coal permeability model considering temperature-stress coupling was constructed，and the evolution mechanism of coal gas seepage under the action of the temperature and the stress was discussed. The newly-built coal permeability model includes four influencing factors such as effective stress，adsorption/desorption，thermal expansion and thermal cracking，and uses damage variables to characterize the matrix expansion effect(thermal cracking) produced during the crack expansion process. The results show that，when the external stress is constant，the permeability first decreases slightly and then increases rapidly with decreasing the pore pressure at different temperatures，and when the pore pressure is constant，the permeability as a whole decreases first and then increases as the temperature increases. During the full stress strain-seepage test of coal，the permeability first decreases and then increases with increasing the axial stress，and both the elastic model and the peak intensity have a negative correlation with the temperature. The calculated values by the new permeability model are basically the same as the measured values，indicating that the model can better characterize the evolution of the permeability with the pore pressure and the effective stress. Based on the definition of the internal expansion stress，the contribution of the internal expansion deformation to the permeability during the action process of temperature and stress was explored. It is also shown that，when the temperature is constant，the permeability decreases with increasing the internal expansion factor，that the width and the damage of coal fractures are related and that the permeability decreases with increasing the temperature mutation coefficient.

Key words： mining engineering coal gas production coal mining permeability temperature

引用本文:

贾荔丹1，李波波1，2，3，李建华1，高政1，许江4，吴学海1. 采气–采煤阶段煤岩渗透率演化机制研究[J]. 岩石力学与工程学报, 2022, 41(1): 132-146.
JIA Lidan1，LI Bobo1，2，3，LI Jianhua1，GAO Zheng1，XU Jiang4，WU Xuehai1. Study on the evolution mechanism of coal permeability during gas production and coal mining. , 2022, 41(1): 132-146.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2021.0482 或 http://rockmech.whrsm.ac.cn/CN/Y2022/V41/I1/132

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