摘要
基于狭窄基坑变形较小的工程实际,针对基坑变形的尺度效应,通过二维有限元模拟,对宽深比对基坑变形的影响规律和基于尺度效应的基坑变形控制措施进行了研究。结果表明:随着基坑宽深比的增加,坑底最大隆起量增大;围护结构最大竖向位移先增加,而后基本不变;围护结构最大水平位移基本不变。对于通过增大插入比或被动区加固来减小围护结构最大水平位移的效果,基坑宽深比的影响并不显著。抽条加固对坑底最大隆起量的减小效果随基坑宽度的增加而减弱。宽深比较大时,裙边加固对减小坑底最大隆起量没有效果。不同的变形控制措施对于不同尺度的基坑效果并不一致,在实际工程中,需要结合基坑尺寸等多方面因素选择适当的控制措施。
A large number of project practices show that deformations of narrow excavations are smaller,which display obvious size effects. The influence of radio of width to depth on the foundation pit deformation is studied by using two-dimensional finite element method. Some deformation control measures are analyzed based on the size effect. The results show： with excavation width increasing,the maximum of heave value of bottom increases; the vertical displacement of retaining wall increases first and then keeps invariant; the maximum of horizontal displacement of retaining wall keeps invariant. Radio of width to depth has no significant influence on the decrease of the maximum of horizontal displacement of retaining wall by increasing insertion ratio or passive zone improvement. With the increase of excavation width,the effect decreases of the strip improvement on the maximum of heave value of bottom. The skirt border improvement has no influence on the maximum of heave value of bottom when radio of width to depth is great.
出处
《四川建筑科学研究》
北大核心
2016年第1期69-74,共6页
Sichuan Building Science
基金
2013年度上海市科技小巨人工程项目(13HX1189000)
关键词
岩土工程
宽深比
基坑变形
入土深度
被动区土体加固
geotechnical engineering
radio of width to depth
excavation deformation
insertion radio
passive zone improvement
