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Abstract According to the characteristics of chlorite schist in Jinping II hydropower station，in the same section，multiple monitoring means including the deformation，stress and borehole TV were adopted to analyze the internal mechanical state of surrounding rock. In order to understand the engineering mechanical properties of chlorite schist and its impact on the deformation failure mechanism，uniaxial and triaxial compression tests，grouting penetration test and triaxial rheological test were carried out. And the test results revealed many factors of deformation，instability and destruction of chlorite schist，and provided reference for determination of supporting measures. The stability of chlorite schist depends mainly on whether the lining structure can resist the squeezing effects caused by rheology and water softening. By introducing softening coefficient and Burgers rheological model，the surrounding rock stability from the viewpoint of the force of the lining structure was evaluated. The results of numerical calculation show that the lining structure is in high safety redundancy.
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Received: 28 May 2013
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2013, Vol. 32 
