摘要
以武汉市临江超深基坑天悦星晨工程为背景,通过对基坑开挖过程的理论研究和监测分析,探讨了基坑支护体系受力变形及周边环境沉降规律。研究发现,基坑开挖过程中支护体系和周边环境沉降存在明显的时空效应:位移最大点位于墙身顶点以下而非顶点;无论是位移或者位移变化率都是支护薄弱和基坑边长较大处较大,位移变化率在开挖基坑中上部时明显较开挖下部时大;墙身随深度内力变化曲线基本呈M形,随开挖深度加深,两峰对应深度加深,内力变化率减小;基坑边长较长处及支护薄弱处内力较大,同时内力变化率也较大;坑外沉降随离基坑距离增大先增大后迅速减小;随基坑开挖,沉降速率先增大后减小;内支撑轴力随基坑开挖先迅速增大后缓慢减小。
Taking deep foundation excavation facing river of Tianyue-xingcheng engineering in Wuhan as background, through the monitoring of entire foundation excavation process, this paper analyzes the bracing structures＇ mechanics deformation and the surrounding environment＇ s settlement law. The study finds that timbering system and the surrounding environment settlement exist significant effects of time and space of excavation process; the maximum displacement point is less rather than wails vertex; whether displacement or displacement change rate is larger at the weak supporting side and the greater length side of foundation; when excavating the upper portion of the foundation excavation, the displacement change rate is significantly large compared with excavating the lower portion of the foundation excavation; the curve of wall＇ s internal force change with depth is substantially ＇ M ＇ type; with the deepening of the excavation depth, the corresponding depth for two peaks is deeper, the change rate of internal forces reduces; at the weak supporting side and the greater length side of foundation excavation, the inter force is larger and the inter force change rate is also larger; the settlement increases first and decreases rapidly later with increasing of distance from the foundation excavation; with the excavation, settlement rate reduces after the first increasing; the inner support＇ s axial force decreases slowly after increasing rapidly with excavation.
出处
《施工技术》
CAS
北大核心
2016年第17期45-50,共6页
Construction Technology
关键词
深基坑
监测
位移
内力
沉降
施工技术
deep foundation excavation
monitoring
displacement
inner force
settlement
construction
