Coupling damage model based on Hoek-Brown criterion and its verification for rock mass subjected to high temperature and load
JIANG Annan
HUANG Xuanxi
XU Mengfei
JIANG Haopeng
Abstract：Aiming at the coupling damage of tunnel rock mass under the joint action of high temperature and load,according to the theory of continuous damage mechanics,an elastoplastic damage constitutive model in accordance with generalized Hoek-Brown(H-B)criterion considering the effect of high temperature was established by introducing the temperature-load coupling damage factor.The problem of singular point in the numerical integration process of the model was solved,and Fortran language was used to compile the numerical algorithm of finite element program.The results show that the trend of the stress-strain curve calculated by the model is consistent with the curve obtained by the test,and the error of the calculated results is within 5%.The damage of tunnel surrounding rock is gradually aggravated under the effect of temperature,confirming the accuracy of the model and the robustness of the program,and it can provide an effective calculation method for the safety and stability evaluation of tunnel surrounding rock suffering fire hazard.
Keywords：generalized Hoek-Brown criterioncoupling damage modelfully implicit stress return mapping algorithmelastoplastic modeltemperature-load couplinguniaxial compression teststress-strain curvetunnel
Publication Date：2024-07-25
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：7( 442-448 )