矿业科学学报2025，Vol.10Issue(4)：607-617,11.DOI:10.19606/j.cnki.jmst.2025017
不同节理开度及连通率下非贯通节理岩体剪切力学特性研究
Study on the shear mechanical properties of non-penetrating joints with different apertures and connectivity rates
摘要
Abstract
Investigating the shear mechanical properties of non-penetrating jointed rock masses under various joint characteristics is of significant practical importance for underground engineering construc-tion.This paper combines laboratory direct shear tests and numerical simulation methods to study the macroscopic and microscopic shear mechanical behavior of non-penetrating jointed rock masses under different joint apertures,joint connectivity rates,and normal stresses.A systematic analysis is conduc-ted on the shear stress-shear displacement curves,peak shear strength,normal displacement-shear dis-placement curves,and stress evolution characteristics.The research findings indicate that:① The shear stress-shear displacement curves of non-penetrating joints exhibit distinct peaks and generally un-dergo stages of compaction,crack propagation,post-peak failure,and residual friction.Based on the shapes of shear curves under various conditions,they can be classified into pre-peak ascending and post-peak climbing type(Type Ⅰ),pre-peak ascending and post-peak stepping type(Type Ⅱ),and pre-peak stepping and post-peak climbing type(Type Ⅲ);② The peak shear strength is negatively correlated with joint aperture and joint connectivity rate,and positively correlated with normal stress.The peak normal displacement is negatively related to joint aperture,and the final normal displacement is negatively related to joint connectivity rate.Both the peak and final normal displacements decrease with the increase of normal stress;③ Before the intact rock bridge fails to penetrate,stress concentra-tion occurs at the joint ends and crack extension areas.As the joint connectivity rate and joint aperture increase,the degree of stress concentration intensifies.After the rock bridge fails to penetrate and forms a shear plane,stress concentration occurs at the plane,and the stress distribution is mainly influ-enced by the plane morphology.关键词
非贯通节理/节理开度/节理连通率/直剪试验/数值模拟Key words
non-penetrating joint/joint aperture/joint connectivity rate/direct shear test/numerical simulation分类
矿业与冶金引用本文复制引用
王刚,李洪奇,刘廷方..不同节理开度及连通率下非贯通节理岩体剪切力学特性研究[J].矿业科学学报,2025,10(4):607-617,11.基金项目
国家自然科学基金(52478390) （52478390）
福建理工大学高层次人才引进科研启动基金(GY-Z23005) （GY-Z23005）
