土工基础

›› 2016, Vol. 30 ›› Issue (4): 471-475.

• 工程实录 • 上一篇    下一篇

复杂条件下深基坑支护的设计优化

汪 丽1，张军平2   

  1. （1.西安航空学院，西安 710077；2.西安中交公路岩土工程有限责任公司，西安 710075）
  • 收稿日期:2016-04-25 出版日期:2016-08-20 发布日期:2016-08-26
  • 作者简介:汪 丽（1978-），女，讲师，研究方向为地基与基础。

Deep Excavation Supporting Design Optimization under Complex Conditions

WANG Li1， ZHANG Junping2   

  1. (1.Xi'an Aeronautical University, Xi'an 710077；
    2.Xi'an China Highway Geotechnical Engineering Co., Ltd., Xi'an 710075)
  • Received:2016-04-25 Online:2016-08-20 Published:2016-08-26

摘要： 为了降低基坑事故发生的概率，进行基坑支护设计时一般偏保守，工程造价相对较高。以西安市某复杂条件下的深基坑工程为实例，利用实测手段和数值模拟手段得到基坑在开挖过程中变形的具体情况和变形规律，验证了原基坑支护方案的安全可靠性，在数值模拟过程中对建模和参数的选取上是合理的，在此基础上，改变锚杆和排桩的设计尺寸，模拟基坑在开挖过程中的变形，进行基坑设计优化，降低工程造价。

关键词: 深基坑, 数值模拟, 变形, 设计优化, 工程造价

Abstract: The supporting cost is a significant portion in the deep excavation and foundation engineering. The conventional deep excavation supporting design is usually conservative in order to reduce the supporting failure during the construction. However, the cost of the supporting is usually not optimized as a result of this conservative design. This paper presents a deep excavation case in the complicated subsurface conditions in Xi'an City. The deformation and stress changes in the supporting system have been numerically predicted and measured. The numerical analyses on the supporting system verified that the design of the system is safe and reliable. Further, the analytical results also confirmed that the parameters used were reasonable.  The supporting system optimization was performed based on the results of numerical analysis; the ground anchor and the dimensions of the secant piles are optimized and the cost was able to be reduced.

Key words: Deep Excavation, Numerical Analyses, Deformation, Design Optimizations, Construction Cost