摘要
基于CFD-DEM耦合数值模拟方法,结合工程实例,通过变参数分析手段研究了暴雨作用下砂土深基坑的灾变模式,并归纳了基坑底部隆起量、围护结构变形量等变化规律。研究结果表明:暴雨最大渗流速度发生在挡墙墙底处;暴雨渗流作用下,基坑内侧靠近支护结构的土体发生隆起,范围逐渐向横向和竖向发展,挡墙产生侧向位移,最终发生踢脚破坏;深基坑挡墙侧向变形和坑内土体的隆起变形均随降雨量和雨量标准差增加而呈增大趋势;暴雨渗流造成的坑底隆起主要发生在挡墙至坑内0.5倍开挖深度范围内。
Based on CFD-DEM coupling numerical modeling,which was validated by a case history,the seepage disaster mode of sand deep foundation pit due to heavy rainfall was studied by means of series of parametric study,and the change rule of uplift at the bottom of the foundation pit and deformation of enclosure structure was concluded.The results show that:the maximum seepage velocity of the rainstorm occurs near the toe of the retaining wall;under the action of the rain seepage,the soils near the inner side of retaining wall moved upwards,causing lateral displacement,which eventually caused kicking failure of retaining wall;lateral deformation of the retaining wall of the deep foundation pit and the uplift deformation of the soil in the pit increase with rainfall amounts and standard deviation of rainfall;the bottom heave caused by the rainstorm seepage mainly extended from the perimeter of retaining walls to about 0.5 times of the excavation depth inside the pit.
作者
刘天任
谭勇
李金龙
LIU Tianren;TAN Yong;LI Jinlong(School of Civil Engineering,Tongji University,Shanghai 200092,China)
出处
《路基工程》
2021年第1期1-9,共9页
Subgrade Engineering
基金
国家自然科学基金资助项目:暴雨气候下砂砾石地层中城市深开挖工程灾变机制研究(41877286)。
关键词
CFD-DEM耦合
深基坑
围护结构
暴雨
砂土
数值模拟
CFD-DEM coupling
deep foundation pit
enclosure structure
heavy rainfall
sand
numerical simulation
