基于Winkler地基离散元模型的复合地基褥垫层工作特性模拟  

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

作　　者：芮瑞[1] 高烽 刘浩[2] 翟玉新 谷金林 RUI Rui;GAO Feng;LIU Hao;ZHAI Yuxin;GU Jinlin(School of Civil Engineering and Architecture,Wuhan University of Technology,Wuhan 430070,Hubei,China;Huadong Branch of China Construction Second Engineering Bureau Ltd.,Shanghai 200135,China;China Railway Construction Group Co.,Ltd.,Beijing 100040,China)

机构地区：[1]武汉理工大学土木工程与建筑学院,湖北武汉430070 [2]中国建筑第二工程局有限公司华东公司,上海200135 [3]中铁建设集团有限公司,北京100040

出　　处：《建筑科学与工程学报》2023年第1期123-132,共10页Journal of Architecture and Civil Engineering

基　　金：国家自然科学基金项目(51208403,51708438);中国建筑第二工程局有限公司科技资助计划项目(CSCEC-2019-Z-29)。

摘　　要：为了更为真实地反映复合地基的工作状态,建立了Winkler桩土地基、基础钢筋混凝土筏板和素混凝土保护层的复合地基离散元(DEM)数值模型并进行了标定。设计了一组L_(16)(4^(5))正交数值试验,以探究复合地基褥垫层厚度、桩宽、基础底板厚度、桩土刚度比的影响,对复合地基褥垫层变形形态、基础底面受力和桩土应力比等进行了分析。结果表明:不同因素对基础底板受力均匀程度的影响由大到小依次为褥垫层厚度、桩土刚度比、底板厚度、桩宽,不同因素对桩土应力比的影响由大到小依次为桩宽、桩土刚度比、褥垫层厚度、基础底板厚度;随着褥垫层厚度的增加,褥垫层变形由三角形模式逐渐扩展,直至形成等沉模式,同时褥垫层力链网络分布更加均匀,桩土应力比显著减小,当褥垫层厚度达到300 mm时,基础底面受力趋于均匀分布。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 ofL_(16)(4^(5))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.

关 键 词：复合地基 褥垫层 WINKLER地基 DEM 工作特性 

分 类 号：TU443[建筑科学—岩土工程]