不同应力路径下花岗片麻岩渗透特性的试验研究

doi:10.13722/j.cnki.jrme.2014.1667

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Abstract Hydro-mechanical triaxial coupling tests were conducted on granitic gneiss with a servo-controlled triaxial equipment. The variations of permeability with seepage pressure，confining pressure，effective confining pressures，volumetric strain and stress paths were investigated based on the results of conventional triaxial compression and triaxial cyclic loading test. During the failure process of rock under two different stress paths，the permeability at each stage decreased with the increase of effective confining pressure. The influence of seepage pressure and confining pressure on permeability was described through the change of effective stress coefficient，effective confining pressure and internal micro cracks and pores in failure process. In triaxial cyclic loading test，the unloading permeability was significantly greater than the corresponding loading permeability. Before the turning point of volumetric strain，permeability decreased during loading and increased during unloading，forming a relatively complete permeability hysteresis loop. After the turning point of volumetric strain，unloading permeability can not be fully restored. The volumetric strain clearly and acutely reflected permeability variation. The turning volumetric strain or its corresponding stress can be regarded as an index of rock permeability change.

Key words： rock mechanics permeability granitic gneiss triaxial cyclic loading stress states effective confining pressure volumetric strain

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2014.1667 OR http://www.rockmech.org/EN/Y2016/V35/I2/260

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