摘要
高速公路在改扩建过程中,首先需要解决的是如何有效地减小新旧路基之间的差异沉降问题,桩承式加筋地基的处理方法在控制路基拼接沉降差的问题上应用越来越为广泛。通过对桩承式加筋地基的基本构成及其特点进行了介绍,分析了加筋体、桩基、褥垫层及桩周土的协同作用的加固机理和工作机理,提出了高速公路加宽工程中桩承式加筋地基的设计原则和方法。根据广三高速公路改扩建工程沿线的地质条件,采用了桩承式加筋地基对部分软基路段进行了处理,有效地解决了软基路段新旧路基拼接后存在的沉降差异过大的问题,使用效果良好。
The potential differential settlement between the proposed and the existing embankment is an important issued that needs to be resolved in the highway widening projects. Column supported embankment receives more and more wide application in effectively minimize the differential settlement between the proposed and the existing embankments. This paper introduces the components of the column supported embankments： reinforced soil; column/pile; and load transfer mat. The interactions mechanism among the reinforced soils, columns/piles and load transfer mat are discussed and the principles as well as the column supported embankment for the highway widening are proposed. As a case history, the column supported embankment is used in the soft soil improvement in Guangsan Expressway Project. The potential differential settlement between the existing and the proposed embankments is successfully minimized.
出处
《土工基础》
2015年第2期75-78,127,共5页
Soil Engineering and Foundation
关键词
高速公路
桩承式加筋地基
公路加宽工程
地基处理
沉降差异
Expressway
Column Supported Embankment
Highway Widening
Soil Improvement
Differential Settlement
