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Abstract The mechanical behaviors of key blocks and characteristics of force transfer of landslides were analyzed. The interactions among forces of sliding，friction and thrust were investigated assuming the anti-sliding forces were not reduced. The slice is at the critical stress state if the sliding force is equal to the friction. Representative characteristics of thrust between the analyzed slices were studied. The difference of the thrust between slices defines the different stress states. If the stresses of slices are between the residual stress state and the peak stress state，the trust change decrease or increase gradually(the measured values of the thrusts can be negative or positive). If the stresses of slices have not reached the peak state，the thrust increases gradually(the measured values of the thrusts can only be positive). A relationship between the coefficients of stability considering the different stress states was derived. The coefficient of stability calculated with the conventional stability analyses in terms of the critical stress state of landslides was not the smallest one, while that calculated in terms of the residual stress state turned out to be the smallest one，considering three different stress state(the critical stress state，the failure stress state，the residual stress state and the mixed stress state).
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Received: 13 May 2013
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2014, Vol. 33 
