00317575

open access

Version of Record

コウベシ セイブ チイキ ニオケル クッサク ツチドメ ノ ヘンケイ ケイソク オヨビ カイセキ ニ カンスル ケンキュウ

Deformation Behavior of Retaining Wall during Excavation Work in Western Kobe : Field Observation & Analysis

Japanese (日本語)

神戸大学都市安全研究センター研究報告

6

97-103

神戸大学都市安全研究センター

2002-03

2007-04-13

After Hyogoken-Nanbu Earthquake in 1995, many infrastructures have been constructed in Kobe, Japan. One of the projects is a deep excavation project at western part of Kobe for "Kobe City Subway -Kaigansen" . In this paper, the observed ground deformation behind the retaining wall was studied by analyzing the instrumentation data as well as using the numerical analysis. For the numerical analysis, various tiaxial tests were performed on the sample taken from the site. The triaxial test data provided the deformation characteristic of the sand comprising the most part of the back fill of the retaining wall. The triaxial tests was performed under three different stress paths(i.e. 1. the compression test with constant cell pressure after isotropic consolidation, 2. the compression test with constant cell pressure after anisotropic consolidation, 3. and the compression test after anisotropic consolidation with decreasing cell pressure under constant axial stress.) The test results indicated the effect of density on the shear modulus is small compared with the difference of the stress paths in triaxial test. Numerical analyses based on these laboratory tests were performed to predict the wall and ground movements during the excavation. The analyses indicated that the predicted magnitude and distribution of the strain behind the wall were similar to the observed one but that the settlement behind the retaining wall was underestimated compared with the observed settlement.

紀要論文