不同应力组合条件下煤岩渗透率的试验

现代矿业 ›› 2011, Vol. 27 ›› Issue (3): 16-19.

不同应力组合条件下煤岩渗透率的试验

李文璞^1,2，王孟来^1,2，唐强^1,2

1.重庆大学；2.西南资源开发及环境灾害控制工程教育部重点实验室

出版日期:2011-03-08 发布日期:2011-03-10

Experimental of Coal-Rock Permeability under Different Stress Combination

Li Wenpu^1,2，Wang Menglai^1,2，Tang Qiang^1,2

1. Chongqing University；2.The Key Laboratory for Exploitation of China SouthwesternResources and Environmental Disaster Control Engineering, Ministry of Education

Online:2011-03-08 Published:2011-03-10

摘要/Abstract

摘要： 利用自制含瓦斯煤热流固耦合三轴伺服渗流实验装置，对煤岩在不同轴压、围压和瓦斯压力组合下进行渗流试验，研究不同围压和瓦斯压力组合下的全应力-应变及在不同应力组合下煤岩渗透性的影响规律。结果表明：煤岩的渗透率随体积应力变化有三个阶段；在轴压和瓦斯压力一定的条件下，渗透率随着围压的增加而减小，且与围压呈二次曲线关系，围压对渗透率的影响比轴压大；在轴压和围压一定的条件下，渗透率随着瓦斯压力的增加先减小后增大，且与瓦斯压力呈三次曲线关系，渗透率减小阶段滑脱效应占主导地位；在一定瓦斯压力和相同体积应力下，渗透率随轴压的增加而增大，随围压的增加而减小，而且呈线性规律。

关键词: 煤岩, 应力组合, 渗透率

Abstract: Based on self-developed triaxial servo gas-seepage experimental device of gas heat solid coupling, gas-seepage experiments were conducted on coal rock under the combination of different axial compression, confining pressure and gas pressure, complete stress-strain under combination of different confining pressure and gas pressure and influence law of coal-rock permeability under different stress combination were researched. The result indicates that there are three stages of permeability of coal-rock with the change of volumetric stress; permeability decreased with the increase of confining pressure, and it shows conical relationship with confining pressure, the influence of confining pressure was bigger than axial compression to permeability under the condition of certain axial compression and gas pressure; Permeability decreased first then increased with the increase of gas pressure, and it shows cubic curve relationship with gas pressure, slippage effect occupies an leading position at stage of permeability decreasing under the condition of certain axial compression and confining pressure; Permeability increase with the increase of axial compression, it decreases with the increase of confining pressure and shows linear law under conditions of a certain gas pressure and the same volumetric stress.

Key words: Coal-rock, Stress combination, Permeability

李文璞, 王孟来, 唐强. 不同应力组合条件下煤岩渗透率的试验[J]. 现代矿业, 2011, 27(3): 16-19.

LI Wen-Pu, WANG Meng-Lai, TANG Qiang. Experimental of Coal-Rock Permeability under Different Stress Combination[J]. Modern Mining, 2011, 27(3): 16-19.

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