土工基础

土工基础 ›› 2024, Vol. 38 ›› Issue (1): 129-134.

• 测试技术 • 上一篇    下一篇

某基坑围护结构变形监测与数值模拟分析

陆思莲1，袁金兴2， 张烨2，陆敬辉2，王月香1   

  1. （1.苏州科技大学 土木工程学院, 江苏苏州 215009;2.苏州中正工程检测有限公司, 江苏苏州 215129）
  • 收稿日期:2022-06-30 修回日期:2022-07-24 出版日期:2024-02-29 发布日期:2024-03-07
  • 通讯作者: 王月香(1977-)，女，副教授，研究方向为环境岩土理论及应用。
  • 作者简介:陆思莲(1997-)，女，硕士研究生，研究方向为环境岩土理论及应用。
  • 基金资助:
    苏州市2021年建设科技发展计划项目（苏建函科（2021）295）

Deformation Monitoring and Numerical Analysis of a Deep Excavation Supporting Structure

LU Silian1, YUAN Jinxin2, ZHANG Ye2, LU Jinghui2， WANG Yuexiang1   

  1. (1.College of Civil Engineering, Suzhou University of Science and Technology, Suzhou 215009；
    2.Suzhou Zhongzheng Engineering Testing Co. Ltd., Suzhou 215129)
  • Received:2022-06-30 Revised:2022-07-24 Online:2024-02-29 Published:2024-03-07

摘要： 结合苏州市某基坑工程，分别对基坑施工过程中采用不同围护结构的桩(坡)顶部水平和竖向位移、地下水位及坑外地表的监测结果分别进行了整理，并对监测数据进行了分析。结果表明，随基坑开挖，不同围护结构的桩(坡)顶水平位移逐渐向坑内侧偏移；桩(坡)顶竖向位移累计绝对值均逐渐增加，各测点的桩(坡)顶竖向位移时程曲线的变化趋势基本一致；坑周土体虽出现沉降，但坑外地表沉降累计值不大且在报警值之内。表明采用SMW工法桩、钻孔灌注桩结合三轴搅拌桩及两级放坡结合搅拌桩的支护形式是有效的。结合ABAQUS有限元软件对基坑支护结构进行了数值模拟分析，结果表明数值模拟与监测结果的变化规律较为一致，表明基坑支护结构设计合理。

关键词: 监测, 基坑变形, 围护结构, 数值模拟

Abstract: Combined with a deep excavation project in Suzhou, the monitoring results of the horizontal and vertical displacement at the top of pile (slope), groundwater level and surface outside the excavated area with different supporting structures in the process of the deep excavation construction are collected and the monitoring data are systematically analyzed. The results show that with the excavation progress, the horizontal displacement of pile (slope) top of different retaining structures gradually shifts to the inside of excavated area. The cumulative absolute value of the vertical displacement of pile (slope) top increases gradually, and the change trend of time history curve of the vertical displacement of pile (slope) top at each measuring point is essentially the same. The soil around the excavated area has settlement, but the cumulative value of the surface settlement outside the pit is not large and is within the allowable value. Therefore, the support form of the SMW method pile, bored pile combined with triaxial mixing pile and twostage slope combined with mixing pile is effective. Finally, the numerical analysis of the deep excavation supporting structure is performed by using the ABAQUS finite element software. The results show that the variation relationship of the numerical simulation and monitoring results is consistent, indicating that the design of the deep excavation supporting structure is reasonable.

Key words: Monitoring, Deep Excavation Support System Deformation, Enclosure Structure, Numerical Simulation

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