长期降雨对路堤填土变形和压实度影响分析

摘要

针对潮湿多雨地区典型路基填土,在京台高速公路高液限路堤填土试验研究的基础上,选取典型断面利用GeoStudio有限元软件开展数值模拟研究,考虑非饱和路堤填土的应力和渗流耦合进行固结分析,研究在长期降雨工况下路基沉降变形规律,进而分析长期降雨对变形和压实度的影响规律以及压实度与路基沉降之间的关系.研究表明:对于不同含水率填土路堤,无论是连续施工和间歇施工,竣工期的沉降量占了总沉降量的绝大部分,竣工时和沉降稳定后路堤的最大沉降量都随含水率的增大而增大.当遇长期降雨时,竣工和沉降稳定时路堤的沉降量都比无降雨时大;长期降雨情况下路堤沉降稳定时压实度增量比无降雨时大.%Aiming at embankment fill in the typical moist rainy region,based on the experimental study on the high liquid limit embankment soil of Beijing-Taiwan highway,numerical simulation study was carried out by GeoStudio finite element software for selected typical section.Consolidation analysis was done considering the stress and seepage coupling of unsaturated embankment fill.The settlement of the embankment was studied for long -term rainfall case.The influence of long-term rainfall on the settlement and compaction,and the relation between compaction and settlement were analyzed.The results show that the settlement at completion accounts for the most of the total settlement.The maximum settlement of embankment increases with moisture content increasing at completion and after settlement stabilization.When the long-term rainfall occurs,the settlement of embankment and compactness increment are both larger than those for no rainfall case.