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| Experimental study of permeability properties of granitic gneiss under different stress paths |
| WANG Wei1，2，ZHENG Zhi1，2，3，WANG Rubin1，2，WANG Huanling4，XU Weiya1，2 |
| (1. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering，Hohai University，Nanjing，Jiangsu 210098，China；2. Institute of Geotechnical Engineering，Hohai University，Nanjing，Jiangsu 210098，China；3. College of Architecture and Civil Engineering，West Anhui University，Liuan，Anhui 237012，China；4. College of Harbour，Coastal and Offshore Engineering，Hohai University，Nanjing，Jiangsu 210098，China) |
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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.
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2016, Vol. 35 
