卸轴压条件下原煤变形及渗透特性实验研究

doi:10.13722/j.cnki.jrme.2015.1562

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摘要利用自行研制的煤岩热流固耦合实验系统，以原煤为研究对象，进行不同卸轴压起始应力条件下原煤变形及渗透特性的实验研究。结果表明：(1) 卸轴压时，原煤轴向应力–应变关系可用二次函数表示；原煤变形模量随卸轴压起始应力的升高而减小。(2) 随着轴压的降低，原煤渗透率上升速率逐渐增大；卸轴压过程中，原煤渗透率的增长趋势随卸轴压起始应力的增大而平缓；线弹性阶段不同起始应力卸轴压，原煤渗透率的变化具有较好的相似性。(3) 原煤瓦斯增透效果随卸轴压起始应力的增大而减弱，卸除单位应力时渗透率相对值的增加量与卸轴压起始应力的关系可以用对数函数表示；随着卸轴压起始应力的增大，卸轴压过程中增透率的增长趋势逐渐减弱。

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关键词 ：岩石力学, 卸轴压, 原煤, 变形, 渗透特性, 增透率

Abstract：Based on domestic-developed triaxial servo-controlled seepage equipment for thero-fluid-solid coupling of coal containing methane，the deformation and permeation experiment on row coal was performed under different initial unload levels. The results show that，in the process of unloading axial stress，the relationship between axial stress and strain of coal contained gas is expressed by quadratic functions，and the resilience deformation of coal containing methane decreases with the increase of initial load level. The ascent rate of the penetration rate of raw coal increases with the decrease of axial pressure. In the process of unloading axial stress，the penetration rate of raw coal becomes mild with the increase of initial load level. And there is a better similarity of the change of gas permeability in linear elastic stage. Gas antireflective effect weakens with the increase of initial load level. The relationship between increment of relative permeability at unloading unit stress and the initial stress can be described by logarithmic function. In the process of unloading axial stress，the growth trend of anti-reflection rate gradually weakens with the increase of initial load level.

Key words： rock mechanics；unload axial stress；raw coal；deformation；seepage characteristics；mining- enhanced permeability

引用本文:

边光1，2，3，张东明1，2，3，李铭辉1，2，3，邓博知1，2，3，赵宏刚1，2，3，刘超1，2，3. 卸轴压条件下原煤变形及渗透特性实验研究[J]. 岩石力学与工程学报, 2016, 35(S2): 3689-3695.
BIAN Guang1，2，3，ZHANG Dongming1，2，3，LI Minghui1，2，3，DENG Bozhi1，2，3，. Experimental study of deformation and seepage characteristics of raw coal under unloading axial stress. , 2016, 35(S2): 3689-3695.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2015.1562 或 https://rockmech.whrsm.ac.cn/CN/Y2016/V35/IS2/3689

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