瓦斯压力对砂岩力学特性影响的试验研究

doi:10.13722/j.cnki.jrme.2016.0257

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摘要

利用自行研制的“煤岩热流固耦合试验系统(THM–2)”，以砂岩为研究对象，进行不同围压和不同瓦斯压力条件下的三轴加载试验，探讨瓦斯压力对岩石力学特性的影响，结果表明：3 MPa瓦斯压力下三轴抗压强度和弹性模量均比无瓦斯条件下小；相同应力下，含瓦斯岩石的应变较大。瓦斯压力对岩石的力学特性起到了弱化作用，使三轴抗压强度表现出一定的非线性特征。采用抛物线型、Hoek-Brown(H-B)等型式的强度准则对岩石的非线性强度特征进行研究，提出考虑瓦斯压力作用的修改型H-B强度准则，经验证修正后的强度准则与试验数据吻合良好，可以作为瓦斯压力作用下岩石破坏的强度判据。

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Abstract：

In order to investigate the influence of gas pressure on the mechanical properties of sandstone， compression tests of triaxial loading at different confining pressures and different gas pressures were carried out by the self-made“thermo-fluid-solid coupling with triaxial-servo controlled seepage equipment system of coal and rock”. The results show that： gas pressure had a weakening effect on the strength of sandstone. It caused the triaxial compressive strength and elastic modulus of 3 MPa gas pressure were both smaller than that of non-gas and the strain of rock was larger under the same stress. Because of the effect of gas pressure，the triaxis compressive strength exhibit distinctly nonlinear characteristics. The parabolic Mohr criterion and Hoek-Brown strength criterion were employed to analysis nonlinear strength characteristics. Then based on the results of research，the modified Hoek-Brown strength criteria which considered the effect of gas pressure were proposed. By performance analysis and evaluation，the experimental data is in good agreement with the modified strength criterion. So it can be used to judge the strength of sandstone under the effect of gas pressure.

Key words： rock mechanics gas pressure mechanical properties weakening effect nonlinear characteristics strength criterion

引用本文:

赵宏刚1，2，3，张东明1，2，3，李文璞1，2，3，边光1，2，3，刘超1，2，3，张驰1，2，3. 瓦斯压力对砂岩力学特性影响的试验研究[J]. 岩石力学与工程学报, 2017, 36(S1): 3239-3247.
ZHAO Honggang1，2，3，ZHANG Dongming1，2，3，LI Wenpu1，2，3，BIAN Guang1，2，3，. Experimental study on influence of gas pressure on mechanical properties of sandstone. , 2017, 36(S1): 3239-3247.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2016.0257 或 https://rockmech.whrsm.ac.cn/CN/Y2017/V36/IS1/3239

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