煤矿安全2025，Vol.56Issue(2)：146-153,8.DOI:10.13347/j.cnki.mkaq.20231380
低应力下软岩统计损伤本构模型与试验验证
Statistical damage constitutive model and test verification of soft rock under low stress
摘要
Abstract
In order to study the damage characteristics and the whole stress-strain process of soft rock under low stress,based on the damage mechanics theory and considering the impact of damage threshold on the elastic stage of rock,a damage threshold expres-sion of soft rock was constructed by taking axial strain as the damage variable factor of rock and combining Drucker-Prager strength criterion and Hooke's law.At the same time,the residual shear strength is introduced to describe the deformation characteristics completely.Based on Weibull distribution theory and Lemaitre strain equivalence theory,a damage constitutive model of soft rock is constructed which can reflect both the elastic stage and the residual deformation stage of low stress downline.The parameters of the theoretical model are calculated by the characteristic points of the stress-strain curve and the data of rock triaxial compression test.The nonlinear variation of peak strength,residual shear strength and confining pressure is reasonably described by exponential func-tion.Finally,the rationality and applicability of the theoretical model proposed in this study are verified by the coal and rock test res-ults.关键词
损伤阈值/Drucker-Prager强度准则/岩石损伤/Weibull分布/本构模型Key words
damage threshold/Drucker-Prager strength criteria/rock damage/Weibull distribution/structure model分类
矿业与冶金引用本文复制引用
邓海森,陶铁军,谢财进,田兴朝,简兵希..低应力下软岩统计损伤本构模型与试验验证[J].煤矿安全,2025,56(2):146-153,8.基金项目
国家自然科学基金地区科学基金资助项目(52064008) （52064008）
贵州省高层次创新型人才(百层次)资助项目(黔科合平台人才-GCC[2022]004-1) （百层次）
贵州省科技计划资助项目(默科合支撑[2023]一般120) （默科合支撑[2023]一般120）
