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Abstract By using plane strength theory，unified strength formula based on the spatially mobiliaed plane(SMP) and Lade-Duncan criteria is derived. Combining with post-peak rock material mechanical properties of post-peak strain softening，considering post-peak internal friction angle ? as intermediate variables，residual strain ? is used to express the post-peak nonlinear elastic modulus E，and finally a unified nonlinear constitutive equation which can be also named as constitutive model of rock post-peak residual stress is established. Combining with triaxial test of typical fractured diorite porphyrite in Eastern area of Xiaoguanzhuang iron mine，simulated calculation of post-peak stress-strain relationship curves for different confining pressures by this model is conducted. The result shows that the post-peak constitutive relation of this study can simulate the experimental results well，so as to prove the rationality of the model and providing a new way to study the post-peak mechanical regular pattern of rock.
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Received: 06 April 2012
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2012, Vol. 31 
