低活性粉煤灰处理桥头跳车问题的研究  

Study on the application of lower activity fly-ash treat the highway-bridge abutment-backfill

作　　者：周谦[1] 

机构地区：[1]长安大学公路学院,陕西西安710064

出　　处：《沈阳建筑大学学报（自然科学版）》2007年第4期576-579,共4页Journal of Shenyang Jianzhu University：Natural Science

基　　金：辽宁省自然科学基金(SJJ200401)

摘　　要：目的为粉煤灰在沈阳地区公路工程中的推广应用提供理论依据和实践经验.方法在对低活性粉煤灰进行物理力学参数室内试验的基础上,运用弹塑性理论和有限元分析方法,对粉煤灰路堤自重作用下软土地基表面的沉降变形,以及交通重复荷载作用下粉煤灰路堤自身的累计塑性变形问题进行理论分析,同时将分析结果与相同工况条件下正常填土路堤的力学行为进行比较分析.结果在自重荷载作用下以粉煤灰作为路堤填筑材料,地基表面的最大沉降量以及坡角的最大拱起量明显小于正常土填筑路堤的沉降量;在交通重复荷载作用下,其累计塑性变形量明显小于正常路堤填土的量值.结论以粉煤灰作为填料解决桥头跳车的方法是可行的,可以减少桥梁台背处的沉降差异,进而解决桥头跳车问题.The mechanical properties of lower activity fly-ash and effectiveness of its application to abutment-backfill are investigated by material experiment, centrifugal modeling test and numerical calculation. It is pointed that the properties of lower activity fly-ash are superior to that of other backfill materials. Its properties have the advantages of light mass, high strength and high modulus. In addition, its construction method is different from that of other materials. Its soil pressure and settlement are smaller than that of other materials markedly. Consequently, the results indicate that the lower activity fly-ash is recommendable backfill material.

关 键 词：低活性粉煤灰 桥头跳车 沉降 数值分析 

分 类 号：U432[交通运输工程—道路与铁道工程]