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| PERMEABILITY OF DENSE ROCK UNDER TRIAXIAL COMPRESSION |
| WANG Wei1，2，XU Weiya1，2，WANG Rubin1，2，CAO Yajun1，2，WANG Huanling3，FENG Shurong4 |
| (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 Harbour，Coastal and Offshore Engineering，Hohai University，Nanjing，Jiangsu 210098，China；4. Mid-South Design and Research Institute，China Hydropower Engineering Consulting Group Co.，Changsha，Hunan 410014，China) |
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Abstract A series of coupled hydro-mechanical triaxial tests on granite specimens were carried out in order to investigate the permeability of dense rock under triaxial compression using servo-controlled triaxial testing equipment. The variations of the permeability with the confining pressure，the seepage pressure and the volumetric strain in the complete stress-strain process of the rock were obtained. The experimental results showed that the stress-strain relation exhibited the behavior of brittle failure. The strength of granite at failure increased with the increasing of confining pressure while the seepage pressure was kept constant. The low seepage pressure had little influence on the failure strength of rock. The granite specimens experienced a stage of compaction and a stage of expansion. The maximum volumetric compressive strain increased with the increase of confining pressure. The lowest permeability appeared before the inflection point of volumetric strain and the volumetric strain corresponding to the lowest permeability was found to be about 95% of the maximum volumetric compressive strain. A relationship between the permeability and the volumetric strain was presented.
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Received: 04 March 2014
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2015, Vol. 34 
