Abstract
At present the energy dissipation rate per unit volume of deforming region is expressed with the function of principal strain rates in upper-bound analysis for Coulomb material and this restricts the application of deforming failure mechanisms in upper-bound method. In this paper, a general method of expressing the energy dissipation rate of deforming region with bulk strain rate was put forward and the conditions that the assumed velocity field of deforming region should meet were pointed out. The general method simplifies the solving process of the energy dissipation rate. Finally, the method was employed to calculate the energy dissipation rate of the logspiral shear zone and was proved practical.
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