土工基础

土工基础 ›› 2024, Vol. 38 ›› Issue (2): 304-309.

• 测试技术 • 上一篇    下一篇

填海区内支撑结构深基坑监测分析

高风昭1,2,刘冬林1,2   

  1. （1.石家庄铁道大学土木工程学院，石家庄 050043；2.石家庄铁道大学道路与铁道工程安全保障省部共建教育部重点实验室，石家庄 050043）
  • 收稿日期:2022-07-24 修回日期:2022-07-29 出版日期:2024-02-29 发布日期:2024-12-22
  • 通讯作者: 刘冬林（1966-），男，博士，教授级高工，研究方向为岩土工程。
  • 作者简介:高风昭（1996-），男，硕士研究生，研究方向为岩土工程。

Monitoring and Analysis of A Deep Excavation in a Reclamation Area with Internal Strut Structure

GAO Fengzhao1,2， LIU Donglin1,2   

  1. (1.College of Civil Engineering, Shijiazhuang Tiedao University, Shijiazhuang 050043；
    2.Key Laboratory of Roads and Railway Engineering Safety Control, Shijiazhuang Tiedao University, Ministry of Education, Shijiazhuang 050043)
  • Received:2022-07-24 Revised:2022-07-29 Online:2024-02-29 Published:2024-12-22

摘要： 填海区基坑岩性复杂、地下水与海水联系紧密、基坑周边环境要求严格。以某填海区内支撑结构深基坑工程为背景，基于不同施工工况下深基坑监测数据，分析了深基坑开挖过程中围护结构水平位移、内支撑轴力、地表沉降、围护桩与立柱隆沉的变形规律。结果表明：围护桩在竖直方向最大侧移发生在基坑坑底附近，沿坑边方向最大侧移位于坑边中部，坑底被动区加固能有效减小坑底以下围护桩的水平位移；水平支撑轴力在竖向第二道支撑轴力最大，同一平面内，基坑中部对撑轴力明显大于基坑角部支撑轴力；基坑周边地表沉降随开挖深度的增加而增加，地表沉降与围护桩侧向变形有较大联系。

关键词: 填海区, 深基坑, 基坑监测, 内支撑结构, 变形规律

Abstract: In the reclamation area, the stratigraphy of the deep excavation area is complicated, and the groundwater is closely connected with the seawater. The surrounding environment of the excavated area has strictive requirements. By using the monitored data in the entire excavation and internal supporting construction process in a nearshore reclaimed area, this paper analyzes the patterns of the horizontal displacement of supporting structure, axial forces in the interior supports, the ground surface subsidence, the upheaving and settlement of the soldier piles. The results show that the maximum lateral displacement of the soldier pile occurs near the bottom of excavation in the vertical direction. The maximum lateral displacement along the edge of the excavation is at the middle of the edge. Improvement in the passive zones at the bottom of excavation can effectively reduce the horizontal displacement of the soldier piles below the excavation. The largest axial force in the horizontal bracing appears in the second vertical struct. In the same plane, the axial force in the middle of the excavation is obviously greater than that of the corner bracing. The ground subsidence around the excavated area increases with the increase of the excavation depth, and the surface subsidence is closely related to the lateral deformation of the soldier piles.

Key words: Reclamation Area, Deep Excavation, Excavation Monitoring, Supporting Structure, Deformation Pattern

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