桥台后加筋回填设计计算方法  

Design and Computational Method for Bridge Approach Reinforced Backfills

作　　者：刘萌成[1] 赵旭航 葛折圣[2] 

机构地区：[1]浙江工业大学建筑工程学院,浙江杭州310014 [2]华南理工大学土木与交通学院,广东广州510641

出　　处：《中国公路学报》2014年第2期17-26,共10页China Journal of Highway and Transport

基　　金：国家自然科学基金项目(51378472);交通运输部西部交通建设科技项目(2011 318 824 730)

摘　　要：为了给桥台后(台背)加筋回填的设计与施工提供参考,通过拔出破坏条件下加筋土单元力学分析,研究了加筋回填的强度参数换算和简化模拟方法;同时,基于已有的台背回填沉降研究成果,研究了台背加筋回填的设计指标与标准以及设计算法与流程。将该方法应用于实际工程,分析了施工期和竣工后加筋回填体沉降变化规律,并阐述了不同填料情况下设计指标验算过程,验证了推荐算法的可行性。研究结果表明:施工期总沉降绝大部分源于回填路基压缩沉降;地基条件良好情况下,工后总沉降大部分源于回填路基累积沉降;桥台容许沉降增加,则台背回填容许差异沉降或纵坡坡度要求相对降低。In order to provide reference for design and construction of bridge approach reinforced backfills （BARB）, the parameter conversion and simplified modeling were investigated by means of mechanical analysis of reinforced soil element in pullout failure mode, and the design indexes and criteria as well as design algorithm and flow chart for BARB were also studied by integrating the existing findings about bridge approach backfill settlement. This method was used for a practical project of BARB. The settlement of reinforced backfills during or after construction was analyzed, and the procedure of checkout of design indexes for different backfills was presented. The feasibility of the proposed method was verified through the case study. The results show that the construction settlement is mostly composed of compressive settlement in the reinforced backfills; the post construction settlement is mostly composed of the cumulative settlement of reinforced backfills in the case with good foundation; the slab slope or allowable differential settlement of bridge approach backfills decreases relatively owing to the increase of allowable settlement of bridge abutment.

关 键 词：道路工程 加筋路基 力学分析 设计计算方法 台背回填 

分 类 号：U416.1[交通运输工程—道路与铁道工程]