Evolution of deformation property and strength component mobilization for thermally treated Beishan granite under compression

Abstract

The cohesion weakening and friction strengthening (CWFS) model for rock reveals the strength components mobilization process during progressive brittle failure process of rock, which is very helpful in understanding mechanical properties of rock. However, the used incremental cyclic loading-unloading compression test for the determination of strength components is very complicated, which limits the application of CWFS model. In this paper, incremental cyclic loading-unloading compression test was firstly carried out to study the evolution of deformation and the strength properties of Beishan granite after various temperatures treated under different confining pressures. We found the axial and lateral unloading modulus are closely related to the applied stress and damage state of rock. Based on these findings, we can accurately determine the plastic strain during the entire failure process using conventional tri-axial compression test data. Furthermore, a strength component (cohesive and frictional strength) determination method was developed using conventional triaxial compression test. Using this method, we analyzed the variation of strength mobilization and deformation properties of Beishan granite after various temperatures treated. At last, a non-simultaneous strength mobilization model for thermally treated granite was obtained and verified by numerical simulation, which demonstrated the effectiveness of the proposed strength determination method.

Keywords

strength components mobilization / secant unloading modulus / Beishan granite / thermally treated / post-failure

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