公路桥涵台背回填材料的离心模型试验研究  

Centrifugal Modeling Test on Highway-bridge Abutment Backfill

作　　者：葛折圣[1] 黄晓明[2] 张肖宁[1] 高俊合 

机构地区：[1]华南理工大学道路研究所,广东广州510641 [2]东南大学交通学院,江苏南京210096 [3]深圳市天健(集团)股份有限公司,广东深圳518034

出　　处：《公路交通科技》2006年第6期40-44,共5页Journal of Highway and Transportation Research and Development

基　　金：西部交通建设科技资助项目(200231800032)

摘　　要：通过土工离心模型试验研究不同回填材料作用于桥涵台背土压力的分布状况和回填区表面沉降变形特征,从而优选出性能最佳的台背回填材料。首先,推导了台背回填问题的离心模型试验相似律;其次,进行了陶粒粉煤灰混凝土、粘性土、风积砂、砂砾和石灰土等几种材料的台背回填离心模型试验。研究发现:这些回填材料的压缩性由大至小的顺序为:粘土→石灰土→砂砾→风积砂→陶粒粉煤灰混凝土;轻质、高强度、低压缩性的陶粒粉煤灰混凝土的土压力和沉降变形最小;散粒体回填材料的施工压实度对回填区的表面沉降影响显著。结果表明:陶粒粉煤灰混凝土应用于桥涵台背回填工程具有明显的优越性,是一种值得推荐的台背回填材料。This paper was undertaken to investigate, by centrifugal modeling test, distribution of soil pressure on abutment back and the settlement of backfill. Firstly, centrifugal modeling test comparability was inferred. Secondly, models with different backfill-material such as argil fly-ash concrete, soil, sand, grit and lime-stabilized soil were experimented. It is pointed that argil fly-ash concrete with properties of light in weight, high intensity and modulus are superior to that of other backfill materials. In addition, the compactness loose-grained backfill-materials has conspicuous impact on abutment back fall area surface settlement. Consequently, the results indicate that argil fly-ash concrete is recommended as backfill material.

关 键 词：桥涵 台背回填 材料 陶粒粉煤灰混凝土 离心模型试验 土压力 沉降 

分 类 号：U416.1[交通运输工程—道路与铁道工程]