土工基础

›› 2019, Vol. 33 ›› Issue (1): 1-6.

• 工程实录 •    下一篇

成都某膨胀土基坑变形分析及加固处理

章 宁1，邓 宇 1，孟宝华 2，马 军2，梁 摇2   

  1. (1.中冶成都勘察研究总院有限公司，成都 610023；2.四川兴承建筑工程有限公司，成都 610101)
  • 收稿日期:2018-05-10 修回日期:2018-05-24 出版日期:2019-03-02 发布日期:2019-03-08
  • 作者简介:章 宁(1986- )，男，工程师，工学学士，研究方向为岩土工程设计及施工管理。

Mitigation and Deformation Analysis of a Deep Excavation in Chengdu Expansive Soils

ZHANG Ning1, DENG Yu1, MENG Baohua2, MA Jun2, LIANG Yao2   

  1. (1.MCCC Chengdu Surveying Geotechnical Research Institute Co., Ltd., Chengdu 610023;
    2.Sichuan Xingcheng Construction Engineering Co., Ltd., Chengdu 610101)
  • Received:2018-05-10 Revised:2018-05-24 Online:2019-03-02 Published:2019-03-08

摘要： 成都膨胀土地区某基坑，基坑北段开挖后出现严重变形。经对基坑周边环境及变形情况分析，发现对地质情况调查不足、未做到分层分段开挖、膨胀性黏土发育及地下水下渗是主要诱因。从基坑及周边建筑物安全出发，采取“卸土+冲孔灌注微型桩+仰斜式泄水孔”及 “角撑+斜撑+仰斜式泄水孔”等措施，有效的控制了基坑变形，确保了施工安全及质量。

关键词: 深基坑, 膨胀土, 变形监测, 信息法施工, 处理措施

Abstract: A deep excavation site in Chengdu City is located in expansive soils and large deformations were occurred in the norther supporting structures. Based on the analysis of the shape of the large deformation and the adjacent environment of the excavation site, it was concluded that the insufficient geotechnical investigation data, lack of layered and segmental excavations, presence of welldeveloped expansive soils and seepage of groundwater were the major causes. The mitigation measures should consider the safety as well as performance of adjacent building structures. One option included unloading soils, displacement micropiles plus daylighting weep holes and another option was corner and raking supporting plus daylighting weep holes. The monitoring data indicated that the excavation induced deformation was successfully controlled.

Key words: deep excavation； expansive soils, deformation monitoring, real time monitoring and construction, mitigation measures