摘要
深地空间岩体赋存环境较为复杂,探明采动扰动下岩石卸荷破坏的前兆信号对深部资源安全开采具有重要意义。针对采动扰动的岩石加卸载破坏问题,基于能量耗散理论,建立了考虑扰动损伤的岩石破坏判据。探究了不同岩石加卸载过程及破坏时的判据指数变化规律,分析了判据指数与岩石破坏的内在联系。并基于新建立的岩石破坏判据,讨论了不同岩性岩石的卸荷破坏判据条件。研究表明:①岩石破坏判据通过引入损伤变量,不仅考虑了采动扰动对岩石卸荷破坏的影响,还反映了岩石劣化过程中荷载、变形对岩石临界状态的影响。②判据指数与损伤变量可用于分析岩石破坏特征的差异性和应力路径对岩石力学行为的影响。③根据岩石卸荷破坏的扩容特征,引入能量增长率概念,建立了适用于花岗岩卸荷破坏的能量增长率界限值,验证结果表明,该界限值预测效果良好,最大主应力误差约5%。
The occurrence environment of rock mass in deep space is complex.It is of great significance to explore the precursor signal of rock unloading failure under construction disturbance for the safe mining of deep resources.Aiming at the problem of rock loading and unloading failure under construction disturbance,based on the energy dissipation theory,a rock failure criterion considering mining disturbance is established.The variation law of criterion index in different rock loading and unloading processes and failure is explored,and the internal relationship between criterion index and rock failure is analyzed.Based on the newly established rock failure criterion,the failure criterion conditions of different lithology rocks are discussed.The study results show that:①By introducing damage variables,the rock failure criterion not only considers the influence of construction disturbance on rock unloading failure,but also reflects the influence of load and deformation on the critical state of rock during rock deterioration.②Criterion index and damage variable can be used to analyze the difference of rock failure characteristics and the influence of stress path on rock mechanical behavior.③According to the expansion characteristics of rock unloading failure,the concept of energy growth rate is introduced to establish the boundary value of energy growth rate suitable for granite unloading failure.The verification results show that the prediction effect of the boundary value is good,and the maximum principal stress error is about 5%.
作者
张钦榕
郭建强
刘继
王姣姣
伍安杰
王涓
ZHANG Qinrong;GUO Jianqiang;LIU Ji;WANG Jiaojiao;WU Anjie;WANG Juan(College of Civil Engineering,Guizhou University,Guiyang 550025,China;China Southern Power Grid Guizhou Power Co.,Ltd.,Anshun 561339,China;China Huadian Corporation Qianyuan Power Co.,Ltd.,Guiyang 550000,China)
出处
《金属矿山》
北大核心
2025年第3期25-35,共11页
Metal Mine
基金
国家自然科学基金项目(编号:41372356)
贵州省自然科学基金项目(编号:黔科合基础—ZK[2023]一般068)。
关键词
能量耗散理论
卸荷应力路径
岩石劣化
破坏判据
energy dissipation theory
unloading stress path
rock deterioration damage
failure judgement
作者简介
张钦榕(1998-),男,硕士研究生;通信作者:郭建强(1980-),男,副教授,博士,硕士研究生导师。
