土工离心机试验涵洞模型设计与分析

针对软基低路堤涵洞模型进行室内离心机试验,介绍了涵洞模型制作的过程以及遇到的一些问题。涵洞模型设计采用了必要的简化手段和替代材料,模型桩基设计采用了等复合模量的换算方法,同时考虑了道路面层与行车荷载的相关换算模式。模型试验结果表明:对于软基低路堤路段,涵洞设置水泥搅拌桩复合地基可以减小绝对沉降,但却增加了路面纵向差异沉降;从减少跳车现象、增加行车舒适性考虑,在软基低路堤路段涵洞设计时建议以控制不均匀沉降为主,以控制绝对沉降为辅的设计理念进行设计。

Culvert Model Design and Analysis Based on Centrifugal Model Test

Two culvert centrifuge model tests were accomplished for low embankment on soft foundation.The process of culvert model making and lots of problems were introduced concretely.Culvert models were designed with the necessary simplified means and alternative materials.The composite modulus conversion method was used in model pile design.At the same time,the conversion methods related with road surface and traffic load were considered.The results show that,for low embankment on soft foundation sections,the cement mixing pile composite foundation in culvert can reduce the absolute settlement,but the road surface longitudinal differential settlement increased.For reducing vehicle jump phenomenon and increasing traffic comfort,the culvert design of low embankment on soft foundation should control the uneven settlement primarily and the absolute settlement secondarily.