摘要
为研究岩质高陡边坡在开挖卸荷过程中应力位移演化规律,采用FLAC^(3D)软件对边坡应力位移状态进行分析,探究了开挖深度、边坡角对边坡开挖过程中应力场、位移场及稳定性的变化影响规律。结果表明:随着开挖深度的增加,水平应力曲率半径减小,在边坡内部形成了“楔形”应力结构,峰值水平应力随开挖深度的增加呈二次函数递减趋势;位移随开挖深度的增加而不断增大,竖直位移呈现出由底板向下的弧形扩展趋势,随着开挖深度持续增加,逐渐演化成边坡圆弧形滑动趋势;随着边坡角度的增加,坡体总位移变化曲线可分为前期陡增、中期缓增、后期平缓3个发展阶段;边坡稳定性系数均随着边坡角和开挖深度的增加而减小,潜在破坏模式为圆弧滑动破坏。
In order to study the evolution law of stress displacement of high and steep rock slope during excavation and unloading,FLAC^(3D) software is used to analyze the stress displacement state of the slope,and the influence law of excavation depth and slope angle on the stress field,displacement field and stability of the slope during excavation is explored.The results show that the curvature radius of horizontal stress decreases with the increase of excavation depth,forming a"wedge"stress structure in the slope,and the peak horizontal stress decreases with the increase of excavation depth.The displacement increases with the increase of excavation depth,and the vertical displacement presents an arc spreading trend from the bottom plate to the bottom,and gradually evolves into a circular arc sliding trend with the continuous increase of excavation depth.With the increase of slope angle,the total displacement curve of slope body can be divided into three stages:steep increase in the early stage,slow increase in the middle stage and gentle development in the late stage.The stability coefficient of slope decreases with the increase of slope angle and excavation depth,and the potential failure mode is circular sliding failure.
作者
朱敬凯
肖寄飞
胡平
刘宇宸
杨佳
ZHU Jingkai;XIAO Jifei;HU Ping;LIU Yuchen;YANG Jia(Power China Roadbridge Group Co.,Ltd.,Beijing 100070,China;China Water Resources and Hydropower Sixth Engineering Bureau Co.,Ltd.,Shenyang 110169,China)
出处
《露天采矿技术》
2025年第5期16-20,共5页
Opencast Mining Technology
关键词
高陡边坡
开挖卸荷
应力演化
位移演化
稳定性
high and steep slope
excavation unloading
stress evolution
displacement evolution
stability
