三轴应力下煤体对CH4/N2的吸附–解吸–扩散–渗流规律及变形特征研究

doi:10.13722/j.cnki.jrme.2022.1288

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摘要 CH4/N2吸附–解吸–扩散–渗流特性是衡量瓦斯抽采能力、注氮驱替瓦斯效果的重要指标。为研究CH4/N2吸附–解吸–扩散–渗流规律及试验全流程煤体变形特征，开展CH4/N2吸附–解吸–渗流试验，分析气体吸附–解吸–渗流与煤体变形的时效性特征，明确气体体积分数对气体吸附–解吸–渗流及煤体变形的影响规律，厘清气体吸附量–解吸量–渗流量与煤体变形的定量关系，探讨煤体变形时空特性和各向异性特征，建立CH4/N2吸附–解吸–渗流试验全流程煤体应变模型。结果表明：相同吸附压力下，纯N2吸附/解吸量最少，吸附/解吸平衡时间最短；随着混合气体中CH4体积分数增大，气体吸附/解吸量增加，吸附/解吸平衡时间延长；纯CH4吸附/解吸量最多，吸附/解吸平衡时间最长。纯N2渗流量最大，随着混合气体中CH4体积分数增大，气体渗流量减小，纯CH4渗流量最少。原煤吸附–解吸–渗流CH4/N2产生的变形具有时效性、空间性及各向异性。CH4，N2扩散系数与其分压呈线性、一元二次函数关系。煤体轴向/环向吸附应变、解吸应变分别与气体体积分数呈一元一次、一元二次函数关系；轴向/环向渗流应变分别与气体体积分数呈一元一次、一元三次函数关系。煤体轴向/环向应变与气体吸附量、解吸量、渗流量依次呈一元二次、一元一次、一元二次函数关系。煤体吸附–解吸–渗流气体过程所受应力涵盖吸附态气体对煤基质的膨胀应力、游离态气体对煤基质的压缩应力、游离态气体对微孔裂隙的膨胀应力。综合考虑2种状态气体的3种变形作用，建立了吸附–解吸–渗流CH4/N2试验全流程的煤体应变模型。

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	季鹏飞1
	2
	林海飞1
	2
	3
	孔祥国1
	2
	3
	李树刚1
	2
	3
	龙航1
	2
	白杨1
	2
	詹孟朝1
	赵天烁1

关键词 ：采矿工程；吸附&ndash, 解吸&ndash, 扩散&ndash, 渗流；动力学特征；变形特征；时空特性；变形机制；应变模型

Abstract：The adsorption-desorption-diffusion-seepage characteristics of CH4/N2 are important indicators to measure the gas extraction capacity and N2 injection on gas displacement effect. In order to study the adsorption-desorption-diffusion-seepage law of CH4/N2 and the deformation characteristics of coal in the whole process of the experiment，the adsorption-desorption-seepage experiments of CH4/N2 were carried out. The timeliness characteristics of gas adsorption-desorption-seepage and coal deformation were analyzed. The influence of gas volume fraction on gas adsorption-desorption-seepage and coal deformation was clarified. The quantitative relationship between gas adsorption-desorption-seepage capacity and coal deformation were clarified. The space-time characteristics and anisotropic characteristics of coal deformation were discussed. A coal strain model for the whole process of CH4/N2 adsorption-desorption-seepage experiment was established. The results showed that under the same injection pressure of gas，the adsorption capacity/desorption capacity of pure N2 was the least，and the equilibrium time of adsorption/desorption was the shortest. As the increase of CH4 volume fraction in the mixture，the gas adsorption capacity/desorption capacity increased，and the adsorption/desorption equilibrium time prolonged. The adsorption capacity/desorption capacity of pure CH4 was the largest，and the equilibrium time of adsorption/desorption was the longest. The seepage capacity of pure N2 was the largest. As the volume fraction of CH4 in the mixed gas increased，the gas seepage capacity decreased，and the seepage capacity of pure CH4 was the least. The coal deformation produced by adsorption-desorption-seepage of CH4/N2 has timeliness，spatiality and anisotropy. The diffusion coefficients of CH4 and N2 in column coal had linear and quadratic function with pore partial pressure. The axial/circumferential adsorption strain and desorption strain of coal had a primary and quadratic function relationship with the gas volume fraction. The coal axial and circumferential of seepage strains had linear and cubic functions relationship with the gas volume fraction. The axial/circumferential strain of coal had a quadratic，primary，quadratic function relationship with the adsorption capacity，desorption capacity and seepage capacity，respectively. The coal stress in the process of gas adsorption-desorption-seepage covered the expansion stress of adsorbed gas to coal matrix，the compression stress of free gas to coal matrix，and the expansion stress of free gas to coal microporous fracture. Considering the three kinds of deformation effects by two state gases，a coal strain model in the whole process of CH4/N2 adsorption-desorption-seepage experiment was established.

Key words： mining engineering adsorption-desorption-diffusion-seepage dynamic characteristics deformation characteristics spatiotemporal characteristics deformation mechanism strain model

引用本文:

季鹏飞1，2，林海飞1，2，3，孔祥国1，2，3，李树刚1，2，3，龙航1，2，白杨1，2，詹孟朝1，赵天烁1. 三轴应力下煤体对CH4/N2的吸附–解吸–扩散–渗流规律及变形特征研究[J]. 岩石力学与工程学报, 2023, 42(10): 2496-2514.
JI Pengfei1，2，LIN Haifei1，2，3，KONG Xiangguo1，2，3，LI Shugang1，2，3，LONG Hang1，2，BAI Yang1，2，ZHAN Mengzhao1，ZHAO Tianshuo1. Study on the law of CH4/N2 adsorption-desorption-diffusion-seepage and the coal deformation characteristics under triaxial stress#br#. , 2023, 42(10): 2496-2514.

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