基于甘肅玉門花崗巖的巖石統(tǒng)計損傷模型研究

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Research on Rock Statistical Damage Model Based on Gansu Yumen Granite

LIAO Wenjun，LIU Junxin，DIAO Hongwei，REN Tianbin，WANG Di （School of Civil Engineering and Architecture，Southwest University of Science and Technology， Mianyang 621010，Sichuan，China）

Abstract： To study the evolution behavior of rock damage under diffrent confining pressures，this study conducted triaxial tests on Yumen granite to obtain stress- strain curves and analyzed the variation patterns of its mechanical properties with confining pressure. By assuming that the micro-strength of rocks followed a Weibull probability distribution based onan existing rock damage constitutive model and considering damage thresholds，a modified strength coeffcient accounting for residual stress effects was introduced.The exponential（EXP）strength criterion for micro-element failure characterization was implemented and the statistical damage model representing the complete stress -strain relationship during triaxial compresson was established.The theoretical curves of the established constitutive model were compared with the experimental curves and D-P model curves based on granite tests.The results indicate that the EXP model can reflect the characteristics offull stress -strain curves during rock triaxial compression and performs better in post-peak residual sections than the D-P model.

Keywords：Granite；Triaxial test；Rock damage model;Exponential strength criterion；Weibull distribution

巖石作為一種天然的高強度脆性材料，在國防和民用建筑中具有重要作用。（剩余7329字）