水文地质工程地质2024，Vol.51Issue(3)：80-89,10.DOI:10.16030/j.cnki.issn.1000-3665.202304042
不同卸载方向下高应力岩石真三轴卸荷力学特性研究
Experimental study of mechanical properties of highly-stressed rocks under true triaxial unloading conditions with different unloading directions
摘要
Abstract
During the excavation process of deep rock masses,the surrounding rock stress field forms alternating zones of stress increase(loading zones)and stress decrease(unloading zones)near the excavation surface,which can easily trigger instability and failure in high-stress rock masses.Despite numerous studies that have been conducted on rock loading and unloading failures,the understanding of rock failure mechanisms under complex true triaxial stress paths remains insufficient.This study focuses on cubic granite specimens from the Linglong gold mine in Shandong.To comprehensively investigate the strength and failure characteristics of granite samples under complex true triaxial loading and unloading paths,true triaxial loading tests under different lateral stresses were conducted,followed by further true triaxial unloading tests in different unloading directions.The experimental results reveal that with the increase of intermediate principal stress,the failure mode of granite under true triaxial loading condition changes from shear-tensile failure to tensile failure,and the true triaxial loading failure strength increases first and then decreases slowly.Under the same intermediate and minimum principal stress conditions,the true triaxial unloading failure strength of granite is smaller than its loading failure strength,and the Mogi strength formula fits well with the true triaxial unloading strength under the minimum principal stress condition.This study provides an essential theoretical basis and guidance for controlling and designing the stability of deep rock masses in engineering applications.关键词
真三轴加卸载/中间主应力/卸载方向/强度/岩石力学Key words
true triaxial loading and unloading/intermediate principal stress/unloading direction/strength/rock mechanics分类
建筑与水利引用本文复制引用
向前,王科,翁磊,尤伟军,储昭飞,李泽宇..不同卸载方向下高应力岩石真三轴卸荷力学特性研究[J].水文地质工程地质,2024,51(3):80-89,10.基金项目
国家自然科学基金面上项目(52278412 （）
42077246) （）
中央高校基本科研业务费专项资金(2042022kf1055) （2042022kf1055）
