土工基础 ›› 2021, Vol. 35 ›› Issue (3): 311-314.

• 工程实录 • 上一篇    下一篇

深大基坑支护变形分析

周振鸿,孙华波,吕 果,曹世超,周艳富   

  1. (建设综合勘察研究设计院有限公司,北京 100007)
  • 收稿日期:2021-04-06 修回日期:2021-04-12 出版日期:2021-06-25 发布日期:2021-06-25
  • 作者简介:周振鸿(1969-),男,高级工程师,研究方向为岩土工程。

Deformation Analysis of Deep and Large Foundation Excavation Support

ZHOU Zhenhong, SUN Huabo, LV Guo, CAO Shichao, ZHOU Yanfu    

  1. (CIGIS (CHINA) Ltd., Beijing 100007)
  • Received:2021-04-06 Revised:2021-04-12 Online:2021-06-25 Published:2021-06-25

摘要: 基于解放军总医院门诊楼深大基坑在不同工况下桩锚支护结构水平位移、桩体深层水平位移、不同腰梁材料和施加不同预应力时桩体以及锚杆轴力变化的监测数据,通过建立三维模型模拟基坑开挖与支护过程,并将所得结果与现场实测数据进行对比分析。研究表明,该基坑支护结构的监测值和数值计算数据吻合较好,各监测值均远小于规范规定的预警值;在基坑开挖与支护施工过程中,桩体变形最大位置发生在桩身中部,与常见的工字钢腰梁相比,采用混凝土腰梁可更好的控制基坑变形,结果表明该基坑选取的支护结构设计合理,可为类似工程提供参考。

关键词: 深大基坑, 桩锚支护, 现场监测, 数值分析, 混凝土腰梁

Abstract: This paper presents a three-dimensional numerical modelling of the deep excavation supporting process. The monitored data of the lateral deflections in the soldier pile and ground anchor supporting structure, deep horizontal displacement in the soldier pile, soldier pile and ground anchor axial force changes under different conditions, different waler beam materials and different prestressing force are compared with the numerical analysis results. The results show as follow: the monitored values and numerical calculation data of the foundation excavation support structure are in good agreement, and the monitored values are far less than the warning values specified in the specification; in the process of foundation excavation and support structure construction, the maximum deformation of the pile occurs in the middle of the pile body, compared with the common Isteel waler beam, the concrete waler beam can better control the deformation of the excavated area, and the analysis shows that the design of the support structure selected for the foundation excavation.

Key words: Deep and Large Foundation Excavation, Soldier Pile and Ground Anchor Supporting, Construction Monitoring, Numerical Simulation, Concrete Waler Beams

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