土工基础

›› 2017, Vol. 31 ›› Issue (5): 563-567.

• 工程实录 • 上一篇    下一篇

SMW工法深基坑工程位移沉降分析

王志文 1,2，陈志波 1，杨建学 3   

  1. （1.福州大学环境与资源学院资源与城乡建设系，福州 350108；2.福建省交通规划设计院，福州 350004；
    3.福建省建筑科学研究院，福州 350025）
  • 收稿日期:2016-10-17 修回日期:2016-11-14 出版日期:2017-10-20 发布日期:2017-10-29
  • 作者简介:王志文(1989-)，男，硕士，研究方向为路桥设计、边坡设计、岩土数值模拟。
  • 基金资助:

    国家自然科学基金（41102167）

Deflection Analysis of Deep Excavation with SMW Supporting System

WANG Zhiwen1,2， CHEN Zhibo1,  YANG Jianxue3   

  1. (1.Department of Resources and UrbanRural Construction, College of Environment and Resources, Fuzhou University, Fuzhou 350108;
    2.Fujian Communications Planning and Design Institute, Fuzhou 350004;
    3.Fujian Academy of Building Research, Fuzhou 350025)
  • Received:2016-10-17 Revised:2016-11-14 Online:2017-10-20 Published:2017-10-29

摘要： 对某深基坑工程开挖施工期间基坑内外位移、沉降、支撑内力、地下水位等监测分析，研究表明：土体的深层水平位移随开挖深度的增加而增大，且与内支撑密度密切相关；基坑坡顶水平位移、坡顶沉降及土体深层水平位移三者变化规律相同，可互相验证；基坑北侧的地表沉降曲线呈凹槽形分布，基坑南侧的地表沉降曲线呈三角形分布；基坑周边地表沉降情况受地下水位变化影响，且具有一定滞后性；台风降雨对于基坑内支撑的轴力及基坑变形影响很大。

关键词: 基坑工程, SMW工法, 监测, 支撑, 位移

Abstract: A deep excavation using Soil Mixing Wall (SMW) method in Fuzhou City was monitored during the construction. The monitored data included: horizontal displacement and vertical settlement behind and in front of the SMW supporting system; stresses within the internal strut supports and groundwater level. Some of the practical conclusions can be drawn from the monitored data: the magnitude of deep horizontal displacement in the soil mass increases with the excavation depth as well as the density of the internal strut supports. The magnitude of horizontal and vertical deflections at the top of the excavation vary with the same relationship as the deep soil horizontal displacement. A concave shape of settlement curve at the ground surface was observed at the north side of the excavation and a triangular settlement shape was identified at the south side of the excavation. The magnitude of the settlement was also affected by groundwater fluctuations and a lapsed effect was found. The typhoon induced precipitation had a significant impact on the stress in the internal support and the deflection of the supporting system.

Key words: Deep Excavations, Soil Mixing Wall (SMW) Method, Construction Monitoring, Internal Support, Deflections