摘要
依托合肥市某深基坑开挖工程,用MIDAS/GTS对基坑开挖及支护全过程进行数值模拟,研究了基坑开挖过程中周围地表竖向位移发展规律,并将模拟结果与监测数据进行对比,监测数据与模拟结果较为吻合。在此基础上深入分析了深基坑开挖引起的地表竖向变形的影响因素。研究结果表明:随着基坑开挖深度的增加,开挖深度对地表竖向变形的影响增大,地表沉降规律呈“凹槽形”;地表沉降模拟最大值约为27.3 mm,监测最大值约为29 mm;地表最大竖向位移点位置对开挖深度不敏感,出现在离墙后约8 m的位置;地表竖向位移随周围荷载减小、土体弹性模量增大、钢支撑直径及钢支撑壁厚增大而有减小的趋势。
Based on a deep foundation pit excavation project in Hefei,the whole process of foundation pit excavation and support is numerically simulated with MIDAS/GTS.The development law of vertical displacement of surrounding surface in the process of foundation pit excavation is studied,and the simulation results are compared with the monitoring data.The monitoring data are in good agreement with the simulation results.On this basis,the influencing factors of surface vertical deformation caused by deep foundation pit excavation are deeply analyzed.The results show that with the increase of foundation pit excavation depth,the influence of excavation depth on surface vertical deformation increases,and the law of surface settlement presents“groove shape”;the maximum value of surface settlement simulation is about 27.3 mm,and the maximum value of monitoring is about 29 mm;the position of the maximum vertical displacement point on the surface is not sensitive to the excavation depth,and appears about 8 m away from the wall;the surface vertical displacement decreases with the decrease of surrounding load,the increase of soil elastic modulus,the increase of steel support diameter and steel support wall thickness.
作者
赵平
ZHAO Ping(Tongling University,Tongling,Anhui 244000,China)
出处
《龙岩学院学报》
2022年第2期81-87,共7页
Journal of Longyan University
基金
国家自然科学基金(51874112)
安徽省质量工程教研项目(2020jyxm2007)
铜陵学院校级科学研究项目(2021tlxyds16)。
关键词
深基坑开挖
竖向变形
现场监测
数值模拟
deep foundation pit excavation
vertical deformation
field monitoring
numerical simulation
