摘要
选用离散元3DEC软件建立顺向岩质边坡的数值模型,模拟降雨工况下的边坡变形破坏过程,通过与边坡原始资料比对验证模型建立的有效性,并将边坡的变形破坏分为剪切蠕变与裂隙发育、滑面贯通与加速滑动、滑块陆续堆积3个阶段.在建立模型的基础上改变单因子的具体量值,通过强度折减法及有关规范计算边坡安全系数,并分析坡高、坡角、外倾结构面倾角、外倾结构面走向与坡面夹角、结构面内摩擦角、结构面黏聚力6个因素对边坡稳定性的影响.研究结果表明:坡角、外倾结构面倾角、结构面内摩擦角的影响显著,外倾结构面走向与坡面夹角影响较明显,坡高和结构面黏聚力有一定影响但并不显著.所得结果对今后的顺向岩质类边坡防治具有一定的指导意义.
By using discrete element 3DEC software,a numerical model of lithological bedding slope is established for simulating the deformation and failure process of slope under rainfall condition.By comparing with the original data of the slope,the validity of the model is verified.The deformation and failure of the slope is divided into three stages:shear creep and crack development,progressive penetration and accelerated slide,sliding block accumulation.On the basis of establishing the model,the concrete value of single factor is changed,the safety factor of slope is calculated by the strength reduction method and relevant specifications,and the influence of six factors on slope stability is analyzed,including slope height,slope angle,inclination angle of extroverted structural plane,angle between extroverted structural plane and slope,friction angle of structural plane,and cohesion of structural plane.The results show that the influence of slope angle,inclination angle and friction angle is significant,the influence of slope direction and slope angle is obvious,but the influence of slope height and cohesion is not significant.The result of this study has guiding value for the prevention and control of forward middle dip rock slope in the future.
作者
王茜
晏鄂川
杨凯
周京城
WANG Qian;YAN Echuan;YANG Kai;ZHOU Jingcheng(Faculty of Engineering,China University of Geosciences(Wuhan),Wuhan 430074,China)
出处
《河南科学》
2021年第4期626-632,共7页
Henan Science
基金
国家自然科学基金项目(41672313)。
关键词
顺向岩质边坡
降雨
变形破坏
3DEC模拟
敏感性分析
lithological bedding slope
rainfall
deformation and failure
3DEC simulation
sensitivity analysis
作者简介
王茜(1995-),女,硕士研究生,主要研究方向为岩土体稳定性评价与利用;通信作者:晏鄂川(1969-),男,教授,博士生导师,主要研究方向为工程地质、岩土地质和环境地质等。
