Please use this identifier to cite or link to this item: https://doi.org/10.1680/geng.9.00078
Title: Mass behaviour of embedded improved soil raft in an excavation
Authors: Yang, H.
Tan, T.S. 
Leung, C.F. 
Keywords: Excavation
Grouting
Mathematical modeling
Issue Date: Feb-2011
Source: Yang, H., Tan, T.S., Leung, C.F. (2011-02). Mass behaviour of embedded improved soil raft in an excavation. Proceedings of the Institution of Civil Engineers: Geotechnical Engineering 164 (1) : 11-25. ScholarBank@NUS Repository. https://doi.org/10.1680/geng.9.00078
Abstract: In deep excavation in soft soils, a layer of soil below formation level is often improved to stabilise the excavation. The improvement, usually by deep cement mixing or jet-grout piling, will result in the construction of a raft of overlapping short columns (termed an 'embedded improved soil raft'). Soil investigation carried out will usually provide information on vertical cores from such columns. But during excavation, the columns are loaded laterally by the inward-moving retaining wall: thus the mobilised mass properties in the lateral direction are of importance in the design. This paper examines the mechanisms of how mass properties are mobilised and their relation to the elemental properties, the variation of properties within a column, and how the columns are arranged. The analysis and the simulation of a reported field case history show that for soil-cement columns arranged just in contact with each other, the mobilised mass stiffness is less than 28% of the elemental material stiffness. The analysis also shows that the properties of the outer layer have a greater impact on the mass behaviour of the embedded improved soil raft than those of the inner layer, and this ought to be considered in any site investigations.
Source Title: Proceedings of the Institution of Civil Engineers: Geotechnical Engineering
URI: http://scholarbank.nus.edu.sg/handle/10635/59110
ISSN: 13532618
DOI: 10.1680/geng.9.00078
Appears in Collections:Staff Publications

Show full item record
Files in This Item:
There are no files associated with this item.

SCOPUSTM   
Citations

5
checked on Dec 6, 2017

WEB OF SCIENCETM
Citations

2
checked on Nov 21, 2017

Page view(s)

36
checked on Dec 10, 2017

Google ScholarTM

Check

Altmetric


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.