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| INVESTIGATION ON CONVENTIONAL TRIAXIAL COMPRESSION TESTS OF DUCTILE ROCK AND LAW OF DEFORMATION AND DAMAGE EVOLUTION |
| ZHANG Zhiliang1，2，XU Weiya1，2，WANG Wei1，2，WANG Rubin1，2 |
| (1. Geotechnical Research Institute，Hohai University，Nanjing，Jiangsu 210098，China；2. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering，Hohai University，Nanjing，Jiangsu 210098，China) |
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Abstract The rock sample is strongly weathered sandstone which is from the compressive zone of the dam foundation of Xiangjiaba hydropower station，and the conventional triaxial experiments under different confining pressures are carried out for the rock by using automatic triaxial servo-instrument. The deformation and failure mechanism of rock are studied. The results show that the rock has significant characteristics of non-linear deformation and ductile failure，so it belongs to ductile rock. In the action of deviatoric stress，the axial and lateral strain of rock reaches 5% and 4% respectively，and the volume expansion strain reaches more than 4%.The deformation mechanical parameters of rock change with the loading. With the increase of deviatoric stress，elastic modulus of the rock decreases as well as Poisson?s ratio increases. The confining pressure enhances the rock resistance to deformation and failure. The greater the confining pressure，the larger the initial expansion deviatoric stress of rock. Based on the density method，the damage evolution of rock is discussed. At the initial loading state，the rock is compacted without damage；when the deviatoric stress exceeds a certain level，the rock damage increases as a linear relationship with the equivalent strain，and the density damage threshold is lower than 0.12. The experiment results offer important reference value to the research of stability of the dam foundation of Xiangjiaba hydropower station.
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Received: 28 October 2010
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2011, Vol. 30 
