高层房屋建筑深基坑施工技术研究  

Research on Construction Technology of Deep Foundation Pit in High-rise Building

作　　者：黄孝禄 HUANG Xiaolu(Fujian Yufeng Construction Engineering Co.,Ltd.,Ningde 352100,Fujian,China)

机构地区：[1]福建誉丰建设工程有限公司,福建宁德352100

出　　处：《工程技术研究》2024年第16期62-64,共3页Engineering and Technological Research

摘　　要：采用排桩进行基坑支护可以显著提高基坑边坡的安全性及稳定性。但基坑开挖深度对地表沉降及桩身位移的影响规律尚不清楚。基于此,文章采用Midas GTS软件建立数值计算模型,对不同开挖深度工况下基坑地表沉降及桩身位移的发展演化规律进行研究。结果表明:基坑开挖对地表沉降的影响可以分为显著影响区域、微弱影响区域及无影响区域;随着距离基坑边缘距离的增加,地表沉降先增大后减小,距基坑边缘1倍基坑深度的范围内,地表沉降最大,因此基坑施工过程中主要监测1倍基坑深度的范围内的地表沉降;在锚固段范围内,桩身位移随着桩身高度的增加并不发生显著变化,桩身高度超过基坑底面后桩身位移快速增大,在距桩顶1/3的范围内,桩身位移随着桩身高度增加而增大的趋势减缓;随着桩身高度的增加,桩身位移逐渐增大,当开挖深度分别为5 m、15 m、20 m时,桩身位移最大值分别达到了6.2 mm、14.8 mm、17.8 mm,均满足规范要求。研究结果可为排桩支护结构的设计及施工提供参考。The safety and stability of foundation pit slope can be significantly improved by using soldier pile wall for foundation pit support.However,the infl uence law of excavation depth on surface settlement and pile displacement is not clear.Based on this,this paper uses Midas GTS software to establish a numerical calculation model to study the development and evolution law of foundation pit surface settlement and pile displacement under different excavation depths.The results show that the infl uence of foundation pit excavation on surface settlement can be divided into signifi cant infl uence area,weak infl uence area and no influence area;with the increase of the distance from the edge of the foundation pit,the surface settlement increases fi rst and then decreases,and the surface settlement is the largest in the range of 1 times the depth of the foundation pit from the edge of the foundation pit,so the surface settlement in the range of 1 times the depth of the foundation pit is mainly monitored during the construction of the foundation pit;in the range of anchorage section,the pile displacement does not change significantly with the increase of pile height and increases rapidly when the pile height exceeds the bottom of foundation pit,in the range of 1/3 from the pile top,the increasing trend of pile displacement with the increase of pile height slows down;with the increase of pile height,the pile displacement increases gradually,when the excavation depth is 5 m,15 m and 20 m respectively,the maximum pile displacement reaches 6.2 mm,14.8 mm and 17.8 mm respectively,which all meet the specification requirements.The research results can provide reference for the design and construction of soldier pile wall support structure.

关 键 词：深基坑 排桩支护 开挖深度 地表沉降 桩身位移 Midas GTS软件 

分 类 号：TU753[建筑科学—建筑技术科学]