|Table of Contents|

Investigation of Influences of Geosynthetic Reinforcement on Composite Foundation Cushion Under Rigid Slab(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2022年01期
Page:
106-115
Research Field:
基础工程
Publishing date:

Info

Title:
Investigation of Influences of Geosynthetic Reinforcement on Composite Foundation Cushion Under Rigid Slab
Author(s):
RUI Rui1;  GU Jin-lin1;  ZHENG Xiao-yan2;  CHEN Cheng1;  ZHAI Yu-xin1; 2;  SUN Yi1
(1. School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, Hubei, China; 2. China Railway Construction Group Co., Ltd., Beijing 100040, China)
Keywords:
composite foundation;  cushion;  geosynthetic-reinforcement;  rigid slab;  trapdoor test;  discrete element
PACS:
TU472
DOI:
10.19815/j.jace.2020.12036
Abstract:
To improve the pile-soil load transfer efficiency of composite foundation under rigid slab, geosynthetic-reinforced cushion is used under the pile raft foundation in some construction projects. However, the influences of geosynthetic reinforcement on the long-term deformation coordination and load transfer of composite foundation is still lack of in-depth studies. A series of model tests were carried out using a two-dimensional multi-trapdoor test device and elliptical steel rod analytical soil to study the working mechanism of unreinforced cushion of composite foundation. Deformation and stress coordination characteristics under different cushion thicknesses were revealed. Based on the model tests, particle flow discrete element method(DEM)was used to establish the numerical models of reinforced cushion and unreinforced cushion. The differences of working mechanism between reinforced cushion and unreinforced cushion was compared, and the influences of cushion thickness, clear distance between piles and geo-reinforcement height on the cushion working mechanism were discussed. The results show that the pile-soil stress ratios and the deformation are close to the unreinforced cushion when the reinforcement placement height is higher than 100 mm. The deformation coordination of the granular cushion will be affected when the reinforcement height is less than 100 mm, resulting in a rapid increase of pile-soil stress ratio with the increase of subsoil settlement. The starting point of steep rise section of the pile-soil stress ratio curve increase with the increase of reinforcement placement height, which could cause ground failure of piles of the composite foundation.

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Last Update: 2021-02-10