文献类型：期刊文献

中文题名：基于表面微凸体磨损特征演化规律的节理剪切强度各向异性机制研究

英文题名：Anisotropy mechanism of shear strength based on wear and shear failure evolution of asperities of joint surface

作者：宋磊博[1,2];亢倩倩[1,2];杜时贵[1,2];钟振[1,2];王刚[1,2];王兴开[1,2];韩观胜[1,2];赵金帅[3]

机构：[1]绍兴文理学院土木工程学院,浙江绍兴312000;[2]绍兴文理学院浙江省岩石力学与地质灾害重点实验室,浙江绍兴312000;[3]江苏大学土木工程与力学学院,江苏镇江212013

年份：2021

卷号：42

期号：9

起止页码：2331

中文期刊名：岩土力学

外文期刊名：Rock and Soil Mechanics

收录：CSTPCD、、CSCD2021_2022、ESCI(收录号：WOS:000692517700001)、EI(收录号：20213710891974)、Scopus、WOS、北大核心、CSCD、北大核心2020

基金：This work was supported by the National Natural Science Foundation of China(42002275), the Natural Science Foundation of Zhejiang Province (LQ20E040002, LGJ20EO90001, LQ21EO40003) and the China Postdoctoral Science Foundation(2021M692319).

语种：中文

中文关键词：粗糙节理;剪切强度;各向异性;剪切破坏体积

外文关键词：rough joint;shear strength;anisotropy;shear failure volume

中文摘要：为了从剪切磨损角度探索剪切强度各向异性的机制,定量分析了粗糙节理在不同法向应力下的强度特征与破坏特征。研究发现,节理的剪切强度和破坏体积表现出与形貌特征相似的各向异性特征,且两者的各向异性特征随着法向应力的增加而逐渐削弱。另外,调查了锯齿节理的倾角特征和高度特征对剪切行为的影响。分析表明:两者都与剪切强度存在正相关的关系,且倾角特征还决定了剪切过程中节理接触区域的局部性。粗糙节理的表面由很多微凸体组成,不同剪切方向上表面接触区域的不同以及该区域内微凸体高度特征和倾角特征的差异是造成剪切强度各向异性的本质原因。而随着法向应力的增加,节理表面越来越多的微凸体的破坏由滑移磨损演化为剪断破坏,在不同剪切方向上破坏体积的差异也逐渐减小,进而导致剪切所需的能量逐渐趋于一致,这是剪切强度各向异性特征被法向应力削弱的主要原因。

外文摘要：To explore the anisotropy mechanism of joint shear strength from its damage characteristics, shear strength and failure characteristics were quantitatively analyzed. The study found that the shear strength and failure characteristics of joint show similar anisotropy with its morphology, and their anisotropy is weakened with the increase of normal stress. In addition, the influence of the inclination and height characteristics of the sawtooth joints on the shearing behavior was investigated. The analysis shows the angle and height characteristics of asperities have a positive correlation with shear strength, and the angle characteristics also determine the locality of asperities contact state during the shear process. The rough joint surface is composed of many microscopic asperities. The essential reason for the anisotropy of shear strength is the different contact area on the joint surface in different shear directions and the difference of asperities height and dip angle in the contact area. With the increase of normal stress, the failure of more and more micro convex bodies on the joint surface evolves from sliding wear to shear failure, and the difference of failure volume in different shear directions gradually decreases, which leads to the gradual consistency of the energy required for shear, which is the main reason why the anisotropic characteristics of shear strength are weakened by normal stress.