附加应力随时间变化的组合桩型复合地基固结解答  

Consolidation solution of composite foundation with composite piles under additional stress varying with time

作　　者：韩毅 武崇福[2] 李文雪 李旭阳 马进学 王建刚 HAN Yi;WU Chongfu;LI Wenxue;LI Xuyang;MA Jinxue;WANG Jiangang(Huazhong Engineering Co,Ltd.of CCCC Tunnel Bureau,Wuhan,Hubei 430014,China;School of Civil Engineering and Mechanics,Yanshan University,Qinhuangdao,Hebei 066004,China)

机构地区：[1]中交隧道局华中工程有限公司,湖北武汉430014 [2]燕山大学建筑工程与力学学院,河北秦皇岛066004

出　　处：《燕山大学学报》2021年第6期552-560,共9页Journal of Yanshan University

基　　金：河北省自然科学基金资助项目(E2020203075)。

摘　　要：组合渗流透水桩-不透水桩复合地基可用于处理沿海地区高速公路的软弱地基,并在路堤填筑过程中,加快路基的排水固结,较早形成强度。本文运用解析法,考虑分级加载,推导了附加应力随时间变化的组合桩型复合地基的固结度表达式。将本文解与瞬时加载解进行分析比较,得到了分级加载的组合桩型复合地基固结规律。结果表明,考虑附加应力随时间变化时,组合透水桩-不透水桩复合地基的固结速率远慢于瞬时加载,且加载时间越长,组合桩型复合地基固结速率越慢;单级加载时,不同的透水桩径向渗透系数和不透水桩土模量比下,组合桩型复合地基固结曲线差异明显。本文解考虑了荷载的时间效应,进一步完善了组合桩型复合地基固结理论,并能为施工提供借鉴。The composite foundation of combined pervious pile and impervious pile can be used to treat the soft foundation of highway in coastal area.In the process of embankment filling,the drainage consolidation of subgrade can be accelerated and the strength is formed earlier.In this paper,the expression of consolidation degree of composite pile foundation with additional stress varying with time was derived by means of analytic method and considering hierarchical loading.The consolidation law of composite pile composite foundation under hierarchical loading was obtained by analyzing and comparing the solution presented with the solution under instantaneous loading.The results show that the consolidation rate of composite foundation is much slower than that of instantaneous loading when the additional stress changes with time,and the longer the loading time is,the slower the consolidation rate of composite foundation of composite pile.Under single stage loading,the consolidation curve of composite pile composite foundation is obviously different under different radial permeability coefficient of permeable pile and impervious pile-soil modulus ratio.This paper considered the time effect of load,further improves the consolidation theory of composite pile composite foundation,and can provide reference for construction.

关 键 词：组合桩型复合地基 固结 分级加载 固结度 解析法 

分 类 号：TU472.3[建筑科学—结构工程]