岩石–混凝土结构面的广义Patton剪切模型  

Generalized Patton shear model for rock-concrete joints

作　　者：赵衡[1,2] 侯继超 赵明华 ZHAO Heng;HOU Ji-chao;ZHAO Ming-hua(School of Civil Engineering,Hunan University,Changsha 410082,China;Key Laboratory of Building Safety and Energy Efficiency of the Ministry of Education,Hunan University,Changsha 410082,China)

机构地区：[1]湖南大学土木工程学院,湖南长沙410082 [2]湖南大学建筑安全与节能教育部重点实验室,湖南长沙410082

出　　处：《岩土工程学报》2022年第11期2106-2114,F0003,F0004,共11页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(51978255);湖南省研究生科研创新项目(QL20220089)。

摘　　要：为合理预测工程中常法向刚度(CNS)条件下岩石–混凝土结构面的剪切强度,在经典Patton模型(理想化为规则三角形粗糙体)的基础上进行改进,将规则三角形粗糙体推广到相似三角形粗糙体节理模型,并给出了相应的岩石–混凝土结构面粗糙度量化方法。与规则三角形粗糙体相比,相似三角形粗糙体由于波长各异而导致各个粗糙体所受的局部应力各不相同,进而引起粗糙体异步破坏的现象。其中,各粗糙体的极限破坏荷载和临界剪切位移根据下限理论求解。在此基础上,建立了相似三角形粗糙体结构面上各粗糙体剪切状态演化方程,并推广了经典Patton模型。该广义Patton模型可同时预测规则和相似三角形结构面剪切强度,并在一定条件下可退化为经典Patton模型。最后,通过12组不同工况下的CNS直剪试验验证了本文模型的合理性。In order to predict the shear strength of the rock-concrete joints subjected to the constant normal stiffness(CNS), the classical Patton model(idealized as regular triangular asperities) is modified, and the regular triangular asperities are extended to similar ones. The quantitative method for the roughness of rock-concrete joints is also given. Compared with the regular ones,the similar triangular asperities carry different local stresses due to different wavelengths, leading to an asynchronous failure.The collapse load and critical shear displacement of every asperity are identified by the lower-bound solution. On this basis, an evolution equation is proposed to quantify the occurrence of local failure, and the classical Patton model is generalized. The generalized Patton model can predict the shear strength of joints of both the regular and the similar triangular asperities, and the current form can be regressed to the classical form under certain conditions. Finally, the proposed model is validated by the observations from 12 groups of CNS direct shear tests.

关 键 词：相似三角形岩石–混凝土结构面 广义Patton模型 常法向刚度 下限理论 直剪试验 剪切机制 

分 类 号：TU473.1[建筑科学—结构工程]