海砂回填路基沉降变形分析  

Research on Settlement Properties of Backfilled Sea Sand Subgrade

作　　者：张彩利[1] 成子满 许秀东[2] 刘树祥[2] 孙莛均 

机构地区：[1]河北工业大学土木与交通学院,天津市300401 [2]唐山市交通运输局,唐山市063000

出　　处：《公路》2017年第2期30-35,共6页Highway

基　　金：唐山市科技局计划项目,项目编号12110220a

摘　　要：为了深入了解海砂回填路基的沉降变形规律,更好地利用海砂修筑路基,结合海砂工程特性,构建有限元模型,分析了软土地基条件下填筑速率、压实度、换填厚度及地下水位对海砂回填路基沉降变形的影响规律。研究结果表明:填筑速率对路基和土基均有影响,填筑速率越大,路基总沉降、工后沉降、差异沉降及土基沉降也越大;路基沉降与压实度大致呈线性关系,路基沉降量和差异沉降均随压实度的提高而减小,这说明增大压实度能够改善路基自身变形,提高路基承载力,减小不均匀沉降。与粉质黏土路基相比,海砂用作路基材料能够减小地下水的不利影响,减小沉降量,增强路基承载能力。In order to make better use of sea sand filling subgrade and find out of the settlement law of filling sea sand subgrade, in this paper combining engineering properties of sea sand the influence of different filling rate, different degree of compaction, different replacement thickness and ground water level on subgrade settlement are analyzed by building finite element model. Research results show that subgrade filling rate has an impact on the embankment and soil foundation, and the subgrade total settlement, settlement after construction, differential settlement, ground settlement increase with the increase of the filling rate. There are a linear relationship between settlement and compaction degree. Subgrade settlement and differential settlement increase with the increase in the degree of compaction. At the same time, experimental results show that the increase of compaction degree can improve the deformation of subgrade itself, and improve subgrade bearing capacity and reduce the differential settlement. Compared with the original subgrade, soil sea sand can reduce the adverse effects of groundwater, and reduce settlement, and enhance the bearing capacity of the foundation.

关 键 词：海砂 软土地基 沉降变形 数值模拟 影响因素 

分 类 号：U416.1[交通运输工程—道路与铁道工程]