土工基础

土工基础 ›› 2021, Vol. 35 ›› Issue (4): 482-486.

• 专题论述 • 上一篇    下一篇

基于泥膜压力平衡的地连墙槽壁稳定判据研究

李毅阳1，李新平1，郭运华1，魏 钢2，李 丹2   

  1. （1.武汉理工大学 道路桥梁与结构工程湖北省重点实验室，武汉 430070；2.中国电建集团铁路建设有限公司，北京 100044）
  • 收稿日期:2020-03-04 修回日期:2020-05-27 出版日期:2021-08-31 发布日期:2021-08-19
  • 作者简介:李毅阳（1996-），男，硕士研究生，研究方向为隧道与地下工程。

Diaphragm Wall Stability Based on Pressure Balance of Slurry

LI Yiyang1, LI Xinping1, GUO Yunhua1, WEI Gang2, LI Dan2   

  1. (1.Hubei Key Laboratory of Roadway, Bridge and Structure Engineering, Wuhan University of Technology, Wuhan 430070;
    2.Power China Railway Construction Co. Ltd., Beijing 100048)
  • Received:2020-03-04 Revised:2020-05-27 Online:2021-08-31 Published:2021-08-19

摘要： 槽壁稳定性及变形控制是地连墙施工质量控制的核心环节，通过稳定性判据获得护壁泥浆配制参数是施工质量控制的重要指标。基于作用于泥膜两侧应力平衡原理，研究泥浆有效护壁压力及槽壁主动土压力随施工过程的动态平衡关系，建立了地连墙槽壁稳定判据。研究表明：槽壁稳定受开挖速度、泥浆黏度、开挖面深度及土层内摩擦角影响，且在槽壁顶部及以下10 m范围、开挖面及以上3 m范围为可能失稳的区域。

关键词: 泥浆护壁, 槽壁, 稳定性判据

Abstract: The stability and deformation control of the excavated side wall is an essential part of the construction quality control of the diaphragm wall. It is an important index of the construction quality control throughout the slurry preparation parameters. Since the mechanism and the role of slurry for the excavated wall stability are not well understood, the empirical method for the concentration of the slurry is still widely used in various projects. The active earth pressure at the excavated wall and the dynamic balance of the pressure of the slurry are illustrated in this paper. The stability criteria of the excavated wall are also presented. The results indicate that, the rate of the diaphragm wall excavation, viscosity of the slurry, depth of the excavation and the internal friction angle of the excavated soil are the factors that might affect the stability of the excavated wall. The potential instability zone is located 10 meters below the ground surface and 3 meters above the bottom of excavation.

Key words: Slurry for Excavated Wall Stability, Excavated Wall Side, Stability Criteria

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