2016年9月上 施工技术 第45卷第17期 CONSTRUCTIONTECHNOLOGY 45 DOI:10. 7672/sgjs2016170045 武汉临江超深基坑施工实测性状研究 周鹏华 （中建三局集团有限公司工程总承包公司，潮北武汉430070） [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。
[关键词】深基坑；监测；位移；内力；沉降；施工技术 [中图分类号】TU753 [文献标识码】A [文章编号]1002-8498（2016)17-0045-06 StudyonMeasuredCharactersofSuperDeepFoundation Excavation Facing River in Construction in Wuhan Zhou Penghua (General Construction Company of CCTEB Group Co.，Lud.，Wuhan,Hubei 430070,China) Abstract: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 walls 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 pared 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 later with increasing of distance from the foundation excavation; with the excavation，setlement rate reduces after the first increasing; the inner support's a...
