摘要
以上海某软土深基坑为研究对象,利用FLAC3D软件进行了9组正交试验,分析基坑开挖过程中隆起量、桩体位移和坑外土体沉降量。研究表明,基坑中间隆起量最大,基坑隆起量可以用指数模型y=AxB模拟,围护桩入土深度对隆起量影响最大;桩体左侧位移开始逐渐增加,当达到最大值18.91~35.58 mm后逐渐减小,桩径对桩体位移影响最大;土体沉降曲线呈现"勺子"状,坑外下侧土体沉降最大为40.76~51.68 mm,桩径对土体沉降影响最大。
Taking a deep foundation pit in Shanghai as research background, nine group orthogonal tests are done to analyze the uplift amount, displacement of pile and settlement out of pit during excavation by using FLAC3D software. The largest uplift occurs in the middle of pit and the uplift amount can be simulated by exponential model y = Ax8. The buried depth of enclosing pile has great effect on uplift amount. The deformation displacement of left side of pile begins to increase and then decreases after reaching the maximum value of 18.91-35.58 mm. The pile diameter has great effect on deformation displacement of pile. The soil sedimentation curve presents as ＂Spoon＂ shape. The maximum value of settlement of the lower side of pit is 40.76- 51.68 mm and the pile diameter has great effect on soil settlement.
出处
《水力发电》
北大核心
2017年第5期43-47,共5页
Water Power
基金
国家自然科学基金资助项目(51178433)
关键词
软土
深基坑
正交试验
坑底隆起
桩体位移
土体沉降
soft soil
deep foundation pit
orthogonal test
uplift amount
displacement of pile
soil sedimentation
