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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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

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

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