路堤荷载下低强度混凝土桩复合地基性状分析  

Analysis of performance of LSC pile composite ground under the load from embankment

作　　者：曾开华[1] 俞建霖[1] 龚晓南[1] 

机构地区：[1]浙江大学土木工程学系,浙江杭州310027

出　　处：《浙江大学学报（工学版）》2004年第2期185-190,共6页Journal of Zhejiang University：Engineering Science

基　　金：浙江省交通厅科研资助项目(200009).

摘　　要：目前在柔性基础下复合地基的设计中仍沿用刚性基础下复合地基的设计理论,因而造成实测值与设计值相差甚远.本文通过某高速公路软土地基处理中进行的现场试验,对路堤柔性基础下低强度混凝土桩复合地基的性状进行了分析研究.测试的项目包括桩土应力、桩土表面沉降、分层沉降、侧向变形等.研究结果表明:在柔性基础下这种复合地基可发挥桩间土的承载能力,其桩土应力比的变化趋势为先减小后增大;另外,实测的沉降量比按刚性基础下复合地基理论计算的沉降量要大.In the design of composite ground under the flexible foundation, the composite ground theory for rigid foundation is employed, so that great difference between measured value and design value occurs. The in-situ tests were performed on the low-strength-concrete (LSC) pile composite ground used for improving soft ground under a highway in China. The performance of this composite ground was investigated by measuring the pile-soil stresses, settlements, and lateral movements of composite ground. The research results show that the soil bearing capacity increases, and the variation of pile-soil stress ratio is from decrease to increase in the composite ground under the flexible foundation. Besides, the measured settlement is larger than the calculated settlement according to the composite foundation theory for rigid foundation.

关 键 词：路堤 低强度混凝土桩 复合地基 柔性基础 软土地基 沉降量 

分 类 号：U213.15[交通运输工程—道路与铁道工程]