摘要
为分析层状岩体各向异性损伤对材料力学参数劣化的影响,室内钻取8种层理倾角的岩样进行单轴压缩试验,基于岩石材料强度服从Weibull分布建立损伤变量的演化方程,分别得出损伤变量随累计应变、层理倾角及破坏模式的变化规律,并分析其各向异性的内在机理。研究结果表明,各向异性损伤主要反映不同倾角的岩石参数在加载过程中不同的劣化程度;损伤变量随累计应变增加逐渐增加,增速呈慢-快-慢趋势;不同倾角岩石的损伤变量的分布规律与岩体弹性模量、抗压强度对应关系较好,即缓倾角和陡倾角时,损伤较小;在发生沿层理面方向的滑移破坏时(倾角为53°左右),损伤变量最大且对层理倾角变化最敏感;损伤变量各向异性度随累计应变的增加呈增加趋势;损伤变量与破坏模式之间有良好的对应关系。研究成果可为工程实践提供理论指导。
In order to analyze the influence of the anisotropic damage of layered rock mass on the deterioration of material mechanical parameters,8 kinds of rock layer were drilled for the uniaxial compression test.The evolution equation of damage variables was established on the basis of that the rock material strength obeys the Weibull distribution.The variation law of the damage variable with the cumulative strain,the bedding angle and the failure mode was derived,and the internal mechanism of the anisotropy was also analyzed.The results show that the anisotropic damage mainly reflects the different degree of deterioration of the rock parameters with different dip angle of the layer during the loading process;The damage variable increases with the cumulative strain increases,and the growth rate shows a slow-fast-slow trend;The damage variable distribution law of rock with different dip angle of the layer has a good corresponding relation with the elastic modulus and compressive strength of the rock mass,that is,when the inclined angle is gentle or steep,the damage is small;When the slippage along the direction of the bedding plane occurs(the dip angle of the layer is 53°),the damage variable is the largest and the most sensitive to the change of the bedding angle;The anisotropy of the damage variable increases as the cumulative strain increases;There is a good correspondence between the damage variable and the failure mode.The research results can provide theoretical guidance for engineering practice.
作者
赵东雷
左双英
黄春
王嵩
杨冲
ZHAO Dong-lei;ZUO Shuang-ying;HUANG Chun;WANG Song;YANG Chong(Resource and Environmental Engineering College,Guizhou University,Guiyang 550025,China;Guizhou Architectural Design&Research Institute CO.,LTD.,Guiyang 550081,China;Guizhou Bureau of Geology and Mineral Engineering Investigation Institute 2nd,Zunyi 563099,China)
出处
《水电能源科学》
北大核心
2019年第11期144-147,91,共5页
Water Resources and Power
基金
国家自然科学基金项目(51469007)
贵州省土木工程一流学科(QYNYL[2017]0013)
贵州省山地地质灾害防治工程技术研究中心项目(黔科合平台人才[2017]5402号)
贵州省科学技术厅社会发展科技攻关项目(黔科合支撑[2017]2866)
关键词
岩石力学
单轴压缩试验
层状岩体
各向异性
岩石损伤
rock mechanics
uniaxial compression test
layered rock mass
anisotropy
rock damage
作者简介
赵东雷(1995-),男,硕士研究生,研究方向为地质工程,E-mail:zdlchn@163.com;通讯作者:左双英(1977-),女,博士、教授、硕导,研究方向为岩体结构与地下工程,E-mail:shyzuo@163.com。
