中字形变径水泥土搅拌桩复合地基固结分析  

Consolidation Analysis of Composite Foundation with Cross-shaped Cement Mixing Pile

作　　者：黄财明 杨涛[1] 盛志成 HUANG Caiming;YANG Tao;SHENG Zhicheng(Department of Civil Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China)

机构地区：[1]上海理工大学土木工程系,上海200093

出　　处：《水利与建筑工程学报》2021年第3期152-158,共7页Journal of Water Resources and Architectural Engineering

基　　金：国家重点研究发展计划项目(2016YFC0802405)。

摘　　要：变径水泥土搅拌桩加固地基是一种新型的复合地基技术。利用轴对称固结模型并基于等竖向应变假定,推导出其复合地基的固结方程,并得到单面排水条件下复合地基的固结解析解。通过与有限元固结度计算结果的比较,评价了所建立的固结解析解的计算精度。最后,通过参数分析研究了中字形搅拌桩复合地基的固结特性。研究表明:中字形搅拌桩复合地基的固结速率随整个桩体刚度、小直径桩段置换率、扩径桩段刚度和长度的增加而增大,随扩径桩段位置的下移而略微增大。扩径桩段直径的变化对复合地基固结速率没有影响。Variable-diameter deep cement mixing column-improved ground is a new type of composite ground.Using the axisymmetric consolidation model and the equal vertical strain assumption,the consolidation equations of the composite ground were derived.And the corresponding analytical solutions were developed under the single-drainage condition.The veracity of the suggested consolidation solution was evaluated by comparing with the result from the finite element analysis.Finally,the consolidation behavior of the composite ground was investigated through the parametric study.The results indicates that the rate of consolidation of the composite foundation with the CDCM columns increases with the stiffness increasing of the CDCM column,the replacement rate of the small-diameter column,as well as the length and stiffness of the large-diameter column.It increases slightly with the movement of the large-diameter column to the end of the CDCM column.The variation in the diameter of the large-diameter column has no effect on the consolidation rate of the composite ground.

关 键 词：中字形搅拌桩 复合地基 固结 解析解 

分 类 号：TU473[建筑科学—结构工程]