Statistical Evaluation of the Load-Settlement Response of a Multicolumn Composite Foundation

This study examined a composite foundation that was improved by the joint usage of two types of columns: soil-cement and stone columns. The composite foundation that consists of soil-cement columns, stone columns, and natural soils is herein referred to as a multicolumn composite foundation (MCF). E...

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Bibliographic Details
Published in:International journal of geomechanics 2018-04, Vol.18 (4)
Main Authors: Zheng, Jun-Jie, Liu, Yong, Pan, Yu-Tao, Hu, Jun
Format: Article
Language:English
Subjects:
Cement
Cements
Composite materials
Concrete
Equivalence
Evaluation
Modulus of elasticity
Plastics
Ratios
Reliability
Soil
Soil cement
Soil properties
Spatial variations
Statistics
Stone columns
Variability
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Summary:This study examined a composite foundation that was improved by the joint usage of two types of columns: soil-cement and stone columns. The composite foundation that consists of soil-cement columns, stone columns, and natural soils is herein referred to as a multicolumn composite foundation (MCF). Explicit expressions of the equivalent modulus of the MCF under elastic and/or plastic conditions were considered. The spatial variability in the material properties of natural soils and soil-cement columns was taken into account during the calculation of the equivalent moduli. Through considerations of variability, the MCF settlement can be predicted in a statistical manner, thus enabling a reliability-based design for the composite foundation under the serviceability limit state. Finally, the reliability-based design methodology was shown to achieve a desirable balance between safety and economic considerations when designing the area replacement ratios of both types of columns in a MCF.
ISSN:1532-3641
1943-5622
DOI:10.1061/(ASCE)GM.1943-5622.0001124