考虑刚度修正的深厚软土层上泡沫混凝土路堤沉降变形特性

Settlement Distortion Characteristics of Foamed Concrete Embankment on Deep Soft Soil with Stiffness Modification

在我国公路建设中,由于多方面的原因,桥头跳车一直没有得到很好的解决。尤其在东南沿海地区,其软土具有泛沉积、超深厚、高含水、强压缩、低强度和高灵敏等不良工程性质。轻质泡沫混凝土由于其质地轻且流动性好,近年来逐渐被运用于软基路堤以及桥台台背的填筑工程中。然而,由于缺乏足够的现场施工经验,还没有得到有效的普及。本文以福建某道路工程为依托,针对不同软土层厚度、不同路堤高度、不同轻质泡沫混凝土等级等一系列典型工况,分析计算了轻质泡沫混凝土块体的刚度贡献对路堤沉降分布的定量影响规律,提出了考虑刚度修正的软土地基上轻质泡沫混凝土路堤沉降计算实用方法。

The problem of bumping at bridge-head has not been well solved due to various reasons, in our country’s highway construction. Especially in the southeast coastal areas, its soft soils have poor engineering properties such as ubiquitous deposition, super deep, high water content, strong compression , low strength, and high sensitivity. Lightweight foam concrete has been gradually used in the filling of soft foundation embankment and the abutment in recent years for light texture and high flowability. However, it has not been effectively popularized, due to the lack of adequate construction experience. Based on a practical engineering in Fujian Province, the quantitative effect of stiffness contribution of lightweight foam concrete on settlement of embankment is analyzed, which considers a series of typical conditions for different soft soil thicknesses, different embankment heights, and different lightweight foam concrete grades. Based on this analysis, a method of calculating the settlement of lightweight foam concrete embankment on soft soil foundation considering stiffness correction is proposed.