上海交通大学学报

上海交通大学学报（自然版） ›› 2013, Vol. 47 ›› Issue (08): 1328-1334.

• 其他 • 上一篇    

侧摩阻力约束下降水引起的地面沉降估算方法

原华1，张庆贺2，张建伟1   

  1.   （1. 河南大学 土木建筑学院， 河南 开封 475004； 2. 同济大学 岩土及地下工程教育部重点实验室， 地下建筑与工程系， 上海 200092）
     
  • 收稿日期:2012-11-25 出版日期:2013-08-29 发布日期:2013-08-29
  • 基金资助:

    河南省重点科技攻关计划项目（132102310113）资助

Estimation Method for Surface Subsidence Induced by Dewatering under the Constraint of Lateral Friction

YUAN Hua1，ZHANG Qinghe2，ZHANG Jianwei1
  

  1. (1. School of Civil Engineering and Architecture, Henan University, Kaifeng 475004, Henan, China;  2. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education,  Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China)
     
  • Received:2012-11-25 Online:2013-08-29 Published:2013-08-29

摘要：

将用于桩体负摩阻力分析的剪切位移法引入基坑降水引起的地面沉降计算中，研究了降水过程中止水帷幕与土体交界处的侧摩阻力对土体沉降的约束机制，以及侧摩阻力在土体中水平方向的传递规律，推导了侧摩阻力对土体沉降的约束位移，提出了考虑侧摩阻力影响的地面沉降量估算方法.实例分析结果表明：侧摩阻力对土体沉降的约束作用主要局限于距止水帷幕18 m的范围内；在土体与止水帷幕交界处，侧摩阻力对土体沉降的约束作用最显著；所提出的考虑侧摩阻力作用的地面沉降计算方法能够很好地预测降水期间地表沉降量的分布.
 
 

关键词: 基坑, 降水, 地面沉降, 侧摩阻力, 剪切位移法

Abstract:

Based on the shear displacement method used in the negative skin friction calculation of pile, this paper analyzed the constraint mechanism of lateral friction located in soil-waterproof curtain interface towards soil settlement as well as its horizontal transfer law in soil during engineering dewatering. Then, the constraint displacement was deduced. Finally, a novel calculation method for soil subsidence estimation induced by dewatering consideration the effect of lateral friction was put forward. The research results show that the constraint function of lateral friction to soil settlement is mainly limited in the range of 18 m away from the waterproof curtain; the position where the constraint effect of lateral friction became most significant was at the interface of soil and waterproof curtain. The novel estimation method proposed taking the lateral friction into account can well predict the space distribution of soil subsidence induced by dewatering.
 

Key words: foundation pit, dewatering, ground surface settlement, lateral friction, shear displacement method

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