摘要
考虑渗流-应力耦合作用下的基坑开挖是当前的研究热点。为定量研究地表荷载对基坑降水开挖过程中土体应力应变特性的影响,基于有限单元法,对某基坑的开挖过程进行模拟。结果表明:地表荷载对基坑开挖造成的位移和应力松弛影响很大,基坑底部卸荷回弹隆起明显;地表荷载对渗流路径和渗流速度没有影响,墙趾附近水流流速最大,易发生流土现象;存在地表荷载一侧的基坑边坡稳定性更低,连续墙发生更大的位移、轴力和弯矩。研究成果可为类似基坑工程降水开挖的设计和施工提供参考。
Excavation of foundation pit under the seepage-stress coupling is the hot-spot of current research. In order to analyze the influence of the surface load on the stress and strain characteristics quantitatively with the process of during foundation pit soil excavation. Based on finite element method was used to simulate and analyze the excavation of a two-dimensional foundation pit excavation.The results show that: the displacement and stress relaxation are influenced by surface load largely, and the bottom soil of foundation pit unloading rebound obviously; surface load has little effect on the seepage path and seepage velocity, the maximum flow velocity is near the toe of the wall, prone to soil flow phenomenon; the stability of slope near the surface load is significantly lower than the other side, and also with bigger displacement, greater axial force and bending moment. The research results can provide a reference for the actual design and construction pit of dewatering excavation.
出处
《人民珠江》
2016年第10期70-74,共5页
Pearl River
关键词
渗流-应力耦合
地表荷载
基坑
位移
弯矩
seepage-stress coupling
surface load
foundation pit
displacement
bending moment
