基坑被动区加固参数对支护结构位移影响分析

马郧; 屈若枫; 周兴涛; 徐光黎; 龙雄华; 李受祉

基坑被动区加固参数对支护结构位移影响分析 English Version

(1. 中国地质大学，湖北武汉 430074；2. 中南勘察设计院(湖北)有限责任公司，湖北武汉 430074)

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作者简介:
马郧(1970– )，男，湖北武汉人，博士研究生，教授级高级工程师，主要从事岩土工程勘察、基坑工程设计工作。

中图分类号: TU47
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出版历程
- 收稿日期: 2012-11-12
- 发布日期: 2012-11-12

Effects of reinforcement parameters in passive zone of excavations on lateral deformation of supporting structures

(1. China University of Geosciences, Wuhan 430074, China; 2. Central Southern Geotechnical Design Institute Co., Ltd., Wuhan 430074，China)

摘要

摘要: 为研究软土地基区域基坑被动区加固参数对支护结构位移影响，以武汉地区某典型基坑工程为背景，采用FLAC二维数值模拟的方法，建立了有限差分基坑被动区的加固模型，并将CX6现场实测值与计算值与进行对比，验证计算模型的合理性；实测桩身应力变化规律同支护体系水平位移分布规律一致，反映了实测数据的正确性；基于模型讨论了加固区域的深度、宽度、形状参数对支护结构位移的影响；并将计算值与支护结构的实测位移进行了对比分析，验证数值模拟的精确性、合理性。结合实测值和数值模拟分析的结果表明，数值模拟可以较好地分析支护体系的实际变形规律；在武汉软弱土层地区，被动区阶梯式加固相比其他加固形式有明显的优势，具有较强的适用性；被动区加固对支护结构变形的位移影响是非常显著的；加固区域各阶深度、宽度都存在一个有效域，当超出该域后，加固效果不会出现显著提升；当各阶加固宽度与深度相当时，加固效果最好。
- 软土地基 /
- 基坑 /
- 阶梯式 /
- 被动区加固 /
- 位移影响 /
- 数值模拟
Abstract: In order to study the influence of the parameters of strengthened soils in passive zone of excavations on the lateral displacement of supporting structures in soft soil ground, based on a typical excavation in Wuhan, a finite difference model is established by the FLAC two-dimensional numerical simulation method. Then, the calculated results of CX6 are compared with the field data to verify the rationality and accuracy of the numerical model. The distribution laws of stress on piles and lateral displacement of supporting structure at different measuring points are in consistency, which reflects the correctness of the measured data. The effects of the depth, width and shape in passive zone on the lateral deformation of the supporting structures are studied. The calculated results are compared with the field data to verify the rationality and accuracy of the numerical model. The better agreement of filed data and the numerical simulation analysis shows that the numerical simulation can be used to analyze the actual deformation laws of the supporting structure. The multi-stair improvement has obvious advantages in passive zone compared with other forms, and it shows great application value in Wuhan soft soil layer areas. The effects of strengthened soils in passive zone on the lateral deformation of the supporting structures are obvious. The effects of the depth and width in passive zone exist a valid range. When those parameters exceed a certain value, the increasing rate of the reinforcement effects will be very little. When the width and depth of the improvement are approximately equal, the optimum reinforcement effect can be obtained.
- soft soil ground /
- excavation /
- multi-stair /
- passive zone reinforcement /
- lateral deformation /
- numerical simulation

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参考文献(10)

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基坑被动区加固参数对支护结构位移影响分析 English Version

作者简介: 马 郧(1970– )，男，湖北武汉人，博士研究生，教授级高级工程师，主要从事岩土工程勘察、基坑工程设计工作。

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Effects of reinforcement parameters in passive zone of excavations on lateral deformation of supporting structures

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作者简介:
马郧(1970– )，男，湖北武汉人，博士研究生，教授级高级工程师，主要从事岩土工程勘察、基坑工程设计工作。