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考虑空间变异性的基坑降水支护开挖引起地面沉降的可靠度评估
CSTR:
[cstr]
作者:
作者单位:

1.重庆大学;2.新加坡南洋理工大学;3.重庆三峡学院

基金项目:

国家自然科学基金项目（面上项目，重点项目，重大项目）,重庆自然科学基金， 重庆市三峡水库岸坡与工程结构灾变防控工程技术研究中心开放基金


Reliability assessment of excavation-induced ground surface settlement with groundwater drawdown considering spatial variability
Author:
Affiliation:

1.chongqing university;2.Nanyang Technological University;3.Chongqing Three Gorges University,;4.Chongqing University,

Fund Project:

National Natural Science Foundation of China, Natural Science Foundation of Chongqing, Chongqing Engineering Research Center of Disaster Prevention & Control for Banks and Structures in Three Gorges Reservoir Area

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    摘要:

    对于软黏土或残积土中的深基坑支护开挖，开挖后的地表沉降与基底隆起及挡墙变形密切相关，且受墙后地下水变化的显著影响。本研究提出了一种基于最新开发的简化对数回归模型的可靠性分析，用于预测地面最大沉降。采用考虑了土体空间变异性的方差缩减技术实现一阶可靠性方法（FORM），探讨了地面沉降超过既定阈值的概率。分析了关于空间平均的影响以及几个关键设计参数的影响，如挡墙的系统刚度，地面沉降阈值的大小，土体特性的变化系数以及地下水下降深度。本研究可为城市深基坑设计和支护提供参考依据。

    Abstract:

    For braced excavations in deep deposits of soft clays or residual soils, the ground surface settlement behind the excavation is closely associated with the extent of basal heave as well as the wall deflections and is also greatly influenced by the groundwater drawdown behind the retaining wall. This paper presented a reliability analysis based on a recently developed simplified Logarithm Regression model for the maximum ground surface settlement estimation. The first-order reliability method (FORM) implemented with a variance reduction technique that considers the spatial variability of soil properties is employed to investigate the probability that certain threshold ground surface settlement is exceeded. Some useful conclusions regarding the effects of spatial averaging, and the influence of several key design parameters such as the wall system stiffness, the magnitude of the threshold ground surface settlement, the coefficient of variation of the soil properties, as well as the magnitude of groundwater drawdown are presented.

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  • 收稿日期:2020-10-13
  • 最后修改日期:2020-11-05
  • 录用日期:2020-11-23
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