Study on the Strength Evolution Mechanism Based on the Energy Conversion Principal
The evolution mechanism of rock strength is required for improving the accuracy and applicability of strength criteria calculation.Considering the fact that the energy conversion plays a dominant role in the physical process of material,and the effect of the elastic strain energy on the material failure,the influences of the confining pressure,the intermediate principal stress and Poisson's ratio on the strength evolution of rock material are studied.The results show that the rock failure is related to stress state and rock deformation characteristics.Noting that neglecting the influence of Poisson's ratio is the basis for the intermediate principal stress theorem,the confining pressure effect and the intermediate principal stress effect ignore the influence of deformation,which is inconsistent with the experimental results and is also the internal reason for the poor accuracy of the corresponding strength theory.The evolution of rock strength is the result of the combined actions of the confining pressure,the intermediate principal stress,and Poisson's ratio.Based on this,the material failure characteristics,the confining pressure interval,and the condition that the triaxial tensile strength is always larger than the triaxial compressive strength under the hydrostatic condition were studied.It is shown from the theoretical and experimental results that the strength theory,which reflects the effects of confining pressure,intermediate principal stress,and Poisson's ratio,has high computational accuracy and applicability.The results of this paper are of great significance for accurately describing the failure characteristics of rocks and establishing universally applicable strength theories.
elastic strain energystrength evolutionintermediate principal stress effectPoisson's ratiostress state
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