Wall and ground responses in a braced excavation considering spatial variability

Zhe Luo, C. Hsein Juang, Fu Kuo Huang

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations

Abstract

A framework for evaluating the probability of exceeding the specified limiting wall and ground responses in a braced excavation is presented in this paper. In this framework, the wall and ground responses in a braced excavation are computed with finite element method (FEM). To model uncertainty with limited data, fuzzy numbers are used to characterize the uncertainty, and the spatial variability of soil properties are incorporated into fuzzy parameters using spatial averaging technique. The FEM analysis of braced excavations with fuzzy parameters is carried out using the vertex method, in which "sampling" of uncertain soil parameters is by means of α-cut intervals, rather than the Monte Carlo technique. The output (the maximum wall deflection and ground settlement) of the FEM analysis in this case are fuzzy numbers, and a technique called fuzzy point estimate method (FPEM) is used to interpret the resulting fuzzy numbers. A well-documented excavation case history is analyzed to demonstrate the proposed framework. The results show that the proposed framework is effective for assessing the probability of exceeding the specified limiting wall and ground response in a braced excavation.

Original languageEnglish
Title of host publicationGeoRisk 2011
Subtitle of host publicationGeotechnical Risk Assessment and Management - Proceedings of the GeoRisk 2011 Conference
Pages770-777
Number of pages8
Edition224 GSP
DOIs
StatePublished - 2011
EventGeoRisk 2011: Geotechnical Risk Assessment and Management - Atlanta, GA, United States
Duration: 26 Jun 201128 Jun 2011

Publication series

NameGeotechnical Special Publication
Number224 GSP
ISSN (Print)0895-0563

Conference

ConferenceGeoRisk 2011: Geotechnical Risk Assessment and Management
Country/TerritoryUnited States
CityAtlanta, GA
Period26/06/1128/06/11

Keywords

  • Excavation
  • Geohazards
  • Spatial analysis
  • Walls

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