摘要
为探究层状碎裂岩体在单轴压缩下的各向异性力学行为以及节理倾角对其破坏模式和能量演化特征的影响,本工作采用砂岩相似材料,通过切割-粘接的方式制备具有0°、15°、30°和45°四组不同节理倾角的层状碎裂岩体试件。通过单轴压缩试验,实时记录试件的应力-应变曲线、裂纹扩展过程,全面分析了不同节理倾角下岩体的力学响应、破坏模式及能量耗散特征。研究结果表明,层状碎裂岩体表现出显著的各向异性力学特性:应力-应变曲线形状、单轴抗压强度、弹性模量、变形模量和峰值应变均与节理倾角呈现非线性关联。具体而言,峰值强度随节理倾角的变化呈现“勺型”分布、弹性模量呈“V”形分布、变形模量则表现出非单调特性;同时,节理倾角对破坏机制具有显著控制作用,即随着节理倾角的增加,破坏模式由拉伸劈裂破坏向节理控制的剪切滑移破坏转变,节理倾角的增大降低岩体刚度,提高剪切破坏的影响;能量分析结果表明,节理倾角越大,岩体的能量储存能力越弱,而能量耗散能力越强。能量耗散方式由拉伸裂缝扩展向节理滑移主导的耗能机制转变。
To investigate the anisotropic mechanical behavior of layered fractured rock masses under uniaxial compression,and the influence of joint inclination on their failure modes and energy evolution characteristics,this study employed a sandstone-like material and fabricated layered fractured rock mass specimens with four different joint inclinations(0°,15°,30°,and 45°)using a cutting-bonding method.Uniaxial compression tests were conducted,and the stress-strain curves and crack propagation processes of the specimens were recorded in real-time.This allows for a comprehensive analysis of the mechanical response,failure modes,and energy dissipation characteristics of the rock masses under varying joint inclinations.The results demonstrated that layered fractured rock masses exhibit significant anisotropic mechanical properties:the shape of the stress-strain curves,uniaxial compressive strength,elastic modulus,deformation modulus,and peak strain all show a non-linear relationship with joint inclination.Specifically,the peak strength displays a“spoon-shaped”distribution with respect to joint inclination,the elastic modulus exhibits a“V-shaped”distribution,and the deformation modulus presents non-monotonic behavior.Simultaneously,joint inclination exerts a significant control on the failure mechanism:as joint inclination increases,the failure mode transitions from tensile splitting failure to shear slip failure controlled by joints,with the increased joint inclination reducing rock mass stiffness and enhancing the influence of shear failure.Energy analysis results indicate that the larger the joint inclination,the weaker the energy storage capacity of the rock mass,and the stronger the energy dissipation capacity.The energy dissipation mode shifts from tensile crack propagation to an energy-consuming mechanism dominated by joint slippage.
作者
高宇
张家明
鲁明智
刘飞
陈菀婷
GAO Yu;ZHANG Jiaming;LU Mingzhi;LIU Fei;CHEN Wanting(Department of Civil Engineering,Faculty of Civil Engineering and Mechanics,Kunming University of Science and Technology,Kunming 650500,China)
出处
《材料导报》
北大核心
2025年第S2期426-430,共5页
Materials Reports
关键词
砂岩相似材料
层状碎裂岩体
节理倾角
各向异性
sandstone-like material
layered fractured rock mass
joint inclination
anisotropy
