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Abstract The variation law for the creep parameters of mica-quartzose schist—elastic modulus and viscosity coefficient during triaxial creep process is obtained by the triaxial creep test. The elastic modulus has different variation laws before and after the yield stress，the relation between viscosity coefficient and time has three types at different stress level. By scanning electron microscope test，the micro-structural changes in major components in mica-quartzose schist during triaxial creep process are derived from observing the radial and axial slices of mica-quartzose schist which made from three creep stages，respectively，and the three stages are no force stage，the upcoming accelerated creep stage and creep damage stage. On this basis，a reasonable micro-scopic interpretation for variation in creep parameters during triaxial creep process is given. The study shows that variation in creep parameters during triaxial creep test for mica-quartzose schist has a good correspondence with the micro-structural changes，the macro variation in creep parameters is an external behavior of internal micro-structural changes of mica-quartzose schist. The function reflecting the actual law of creep parameters variation is established，and then the creep model is derived，which can be an approach to describe the upcoming accelerated creep stage of rocks.
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Received: 28 January 2010
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2011, Vol. 30 
