车辆荷载作用下路堤高度对高速公路软基沉降的影响分析

基于车辆荷载的特点和我国车辆普遍超载的现状，采用将车辆荷载简化为静荷载的拟静力计算方法，以4个工程实例分析了路堤高度对由车辆荷载引起的高速公路软土地基沉降的影响。研究结果表明，由车辆荷载引起的软土地基沉降量随路堤高度的降低呈指数关系增大，增加路堤的高度是减小该沉降量的有效方法。在某一路堤高度范围内，高速公路可能存在一个最佳路堤高度，低于或高于这个最佳路堤高度，由车辆荷载引起的地基沉降量都大于最佳路堤高度下的地基沉降量，这个最佳路堤高度存在与否以及其具体高度与车辆荷载大小和地基土的性质有关。

Analysis of influence of embankment height on settlement of expressway on soft foundation under vehicle loads

Based on the characteristic of vehicle load and the actual situation of over loading of vehicles in China, the quasi-static method that simplify vehicle load as static concentrated load is adopted to analyze the influence of embankment height on expressway settlement of soft ground induced by vehicle load through four engineering examples. The results indicate that the settlement of expressway on soft ground induced by vehicle loads exponentially increases with the decrease of embankment height; and increasing the embankment height is an effective method to reduce the settlement. An optimal embankment height may exist in a range of embankment height. If the embankment height is lower or higher than that optimal one, the highway settlement induced by vehicle load will increase. Whether this optimal height exists or not and its actual value are related to the vehicle load and the soil character.