摘要
采用核磁共振技术、数值模拟和能量理论相结合方法,研究岩石加载过程中小、中、大孔径孔隙及裂隙向宏观破坏逐级转化的孔隙演化规律,以及孔隙演化过程中伴随的能量演化规律,阐明“孔隙演化阶段”与“能量演化阶段”“双阶段”的统一性关系,建立岩石微观结构与巷道围岩劣化程度定量表征。研究结果表明:获取了试样单轴加载中孔隙率演化分布特征曲线,将孔隙率演化分布特征划分为孔隙压密阶段、弹性变形阶段、弹塑性变形阶段和塑性屈服阶段四个演化阶段。揭示了室内与数值模拟孔隙演化过程中孔隙演化阶段特征存在差异性机制,该差异是由室内试验卸载过程中试样已产生的弹性变形恢复所致。阐明了“孔隙演化阶段”与“能量演化阶段”两者协同演化过程具有一致性特点,“双阶段”协同演化过程曲线呈现归一化值基本一致特征,其两者存在微宏观跨尺度统一性关系。构建出基于微-宏观跨尺度岩石结构协同演化的巷道围岩劣化破坏预警方法,对围岩劣化程度进行综合评判,给出相应区域岩层的预警等级,为现场相应安全隐患防控工作提供了理论基础。
The assessment of the degree of deterioration of surrounding rock in a roadway is a critical issue for the prediction of roof disasters,which are essentially caused by the microstructural evolution inside the rock mass.In this paper,a combination of nuclear magnetic resonance technology,numerical simulation,and energy theory is employed to investigate the pore evolution laws from small,medium,and large aperture pores and cracks to macroscopic failure during rock loading,as well as the associated energy evolution laws.The unification relationship between the“pore evolution stage”and the“energy evolution stage,”which forms a“dual-stage”evolution process,is elucidated to establish a quantitative characterization of the microstructure of rock and the degree of deterioration of surrounding rock in a roadway.The results show that the distribution characteristics of porosity evolution during uniaxial loading of the specimens are obtained,and the porosity evolution is divided into four stages:pore compaction stage,elastic deformation stage,elastic-plastic deformation stage,and plastic yield stage.The mechanism of the differences in the characteristics of the pore evolution stages between laboratory tests and numerical simulations during the pore evolution process is revealed,which is caused by the elastic deformation recovery of the specimen during the unloading process of the laboratory test.The consistency between the“pore evolution stage”and the“energy evolution stage”during the synergistic evolution process is demonstrated,and the“dual-stage”synergistic evolution process curve shows a basic consistency in normalized values,indicating a micro-macro cross-scale unification relationship between the two.A roadway surrounding rock deterioration and failure warning method based on micro-macro cross-scale rock structure synergistic evolution is constructed to comprehensively evaluate the degree of rock deterioration,give corresponding warning levels for the rock strata in the relevant areas,and provide a theoretical basis for on-site safety hazard prevention and control work.
作者
吴祥业
廖大林
张玉江
陈世江
李建伟
迟学海
WU Xiangye;LIAO Dalin;ZHANG Yujiang;CHEN Shijiang;LI Jianwei;CHI Xuehai(School of Mining and Coal,Inner Mongolia University of Science and Technology,Baotou,Inner Mongolia 014010,China;Inner Mongolia Key Laboratory of Mining Engineering,Baotou,Inner Mongolia 014010,China;Inner Mongolia Research Center for Coal Safety Mining and Utilization Engineering and Technology,Baotou,Inner Mongolia 014010,China;Inner Mongolia Cooperative Innovation Center for Coal Green Mining and Green Utilization,Baotou,Inner Mongolia 014010,China;College of Mining Engineering,Taiyuan University of Technology,Taiyuan,Shanxi 030024,China;School of Mining and Mechanical Engineering,Liupanshui Normal University,Liupanshui,Guizhou 553004,China;College of Mining Engineering,Heilongjiang University of Science and Technology,Harbin,Heilongjiang 150022,China)
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2024年第S01期3450-3463,共14页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金资助项目(51964036,52264010,52004172)
关键词
岩石力学
孔隙演化
能量演化
围岩劣化
定量表征
协同预警
rock mechanics
pore evolution
energy evolution
enclosing rock deterioration
quantitative characterization
collaborative early warning
作者简介
吴祥业(1986-),男,博士,2009年毕业于黑龙江科技大学采矿工程专业,现任副教授、博士生导师,主要从事矿山压力与巷道围岩控制方面的研究工作。E-mail:175874171@qq.com;通讯作者:廖大林(1996-),男,现为硕士研究生。E-mail:liaodalin1996@163.com
