考虑T应力及裂隙参数的岩体压剪断裂准则  

Compression-Shear Fracture Criterion for the Rockmass Considering T-Stress and Crack Parameter

作　　者：刘红岩[1] 祝凤金 周月智 郑秀华[1] LIU Hong-yan;ZHU Feng-jin;ZHOU Yue-zhi;ZHENG Xiu-hua(School of Engineering&Technology,China University of Geosciences(Beijing),Beijing 100083,China;College of Civil Engineering and Architecture,Zhejiang University,Hangzhou 310028,China)

机构地区：[1]中国地质大学(北京)工程技术学院,北京100083 [2]浙江大学建筑工程学院,浙江杭州310028

出　　处：《东北大学学报（自然科学版）》2024年第6期874-882,共9页Journal of Northeastern University(Natural Science)

基　　金：北京市自然科学基金资助项目(8222031);国家重点研发计划项目(2019YFC1509701);新疆维吾尔自治区“天池英才”领军人才计划资助项目(2023);国家自然科学基金资助项目(42172342).

摘　　要：针对压剪作用下裂隙面将发生闭合及摩擦滑移的特点,首先基于Muskhelishvili复变函数理论,建立了压剪作用下裂隙岩体的Kolossoff-Muskhelishvilli应力函数,并求得考虑裂隙3类参数(即几何参数、摩擦强度参数和变形参数)的裂隙尖端应力强度因子K和3个T应力分量的计算公式;其次,将其代入经典的最大周向应力准则,得到考虑裂隙尖端T应力及裂隙3类参数的修正最大周向应力准则;同时该准则认为裂隙法向及切向刚度与裂隙面受力特征密切相关,而非定值,并给出了不同裂隙倾角时的裂隙变形参数.最后,基于压剪作用下翼裂纹起裂角试验结果对该准则的合理性进行了初步验证,结果说明考虑裂隙变形参数是有必要的.For the mechanical characteristic of the crack surface closure and friction sliding under compression‑shear load,Kolossoff-Muskhelishvilli stress function of the cracked rockmass subjected to compression and shear load is firstly established based on Muskhelishvili complex function theory.Then the calculation formulae of the stress intensity factor K and three T-stress components at the crack tip considering three kinds of crack parameters(namely geometry parameter,friction strength parameter and deformation parameter)are proposed.Secondly,a revised maximum tangential stress criterion is obtained by incorporating T-stress at the crack tip and three kinds of crack parameters into the classic maximum tangential stress(MTS)criterion.Meanwhile this proposed criterion assumes that the crack deformation parameter such as crack normal and shear stiffness is not a constant and is closely related to the stress characteristic on the crack face.Additionally,the crack deformation parameters for different crack dip angles are given.Finally,the experiment results of the wing‑crack initiation angle under compression and shear load are adopted to preliminarily valid the revised criterion.It indicates that it is necessary to consider the crack deformation parameter.

关 键 词：T应力 裂隙变形参数 岩体压剪断裂准则 Kolossoff-Muskhelishvilli应力函数 翼裂纹起裂角 

分 类 号：TU443[建筑科学—岩土工程]