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| EXPERIMENTAL STUDY OF INFLUENCES OF CONFINING PRESSURES AND GROUND WATER ON RESIDUAL STRENGTH AND POST-PEAK VOLUMETRIC CHANGE OF SOFT ROCK |
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Abstract The post-peak mechanical behaviors of black macker widely distributed in Baozhen tunnel are discussed by a series of triaxial compressive tests under different saturated times，and research on changing laws of rock residual strengths and post-peak volumetric strain under different confining pressures and saturated times is carried out. In addition，the mechanism and features of confining pressure，saturation time acting on remnant strength are researched. Finally，the timing of carrying out secondary lining is analyzed.
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Received: 20 June 2008
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