|Table of Contents|

Simulation of working characteristics of composite foundation cushion based on Winkler foundation discrete element model(PDF)

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

Issue:
2023年01期
Page:
123-132
Research Field:
基础工程
Publishing date:

Info

Title:
Simulation of working characteristics of composite foundation cushion based on Winkler foundation discrete element model
Author(s):
RUI Rui1;  GAO Feng1;  LIU Hao2;  ZHAI Yuxin3;  GU Jinlin1
(1. School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, Hubei, China; 2. Huadong Branch of China Construction Second Engineering Bureau Ltd., Shanghai 200135, China; 3. China Railway Construction Group Co., Ltd., Beijing 100040, China)
Keywords:
composite foundation;  cushion layer;  Winkler foundation;  DEM;  working characteristic
PACS:
TU443
DOI:
10.19815/j.jace.2021.09079
Abstract:
In order to reflect the working state of composite foundation more truly, the discrete element method(DEM)numerical models of composite foundation with Winkler pile foundation, reinforced concrete raft base and plain concrete layer were established and calibrated. A set of L16(45)orthogonal numerical tests were designed to explore the influence of the thickness of cushion layer, pile width, foundation slab thickness and pile-soil stiffness ratio of composite foundation, and the deformation form of cushion layer of composite foundation, the stress on the bottom of foundation and the pile-soil stress ratio were analyzed. The results show that the influence of different factors on the stress uniformity of the foundation slab is in the descending order of cushion layer thickness, pile-soil stiffness ratio, foundation slab thickness and pile width. The influence of different factors on the pile-soil stress ratio from large to small is pile width, pile-soil stiffness ratio, cushion layer thickness, and foundation slab thickness. With the increase of the cushion layer thickness, the deformation of the cushion layer gradually expands from a triangular pattern to a constant sedimentation pattern. At the same time, the force chain network of the cushion layer is more evenly distributed, and the pile-soil stress ratio is significantly reduced. When the thickness of the cushion layer reaches 300 mm, the stress on the bottom of the foundation tends to be evenly distributed.

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Last Update: 2023-01-01