泡沫轻质土换填路堤下地基沉降计算方法

Calculation method of foundation settlement of embankment filled with foam light soil

为探究泡沫轻质土换填路堤的基底沉降变形规律,运用数值积分方法推导出泡沫轻质土路堤荷载下地基的竖向附加应力解析解,并结合分层总和法,提出轻质土路堤堆载下地基沉降的理论计算模型。以广连高速某泡沫轻质土路基工程为例,开展工程实例分析。研究结果表明:在泡沫轻质土路堤荷载作用下,地基的沉降理论值在水平方向上呈V形分布,路堤中心位置处的沉降量最大,越靠近路堤两侧,地基沉降量越小;换填轻质土能降低地基土的上覆荷载,有效降低路面的整体沉降。地基沉降理论值与现场实测数据较为吻合,验证了该沉降计算方法的合理性,可为轻质土路基的设计与施工提供参考。

In order to explore the settlement and deformation characteristics of the foundation of the embankment filled with foam lightweight soil,the vertical additional stress of foundation was deduced using the numerical integration method,and a theoretical calculation model for foundation settlement of light soil embankment was proposed combined with hierarchical summation method.And the engineering example analysis was carried out,based on a foam lightweight soil embankment project on Guanglian Expressway.The results showed that,caused by the action of the foam light soil embankment,the theoretical settlement value of the foundation is distributed in a V-shaped curve in the horizontal direction,and the settlement at the center of the embankment is maximum.The closer to sides of embankment,the smaller the settlement of foundation.The overburden load of the foundation soil can be reduced by the foam light soil,reducing the overall settlement.The theoretical value of foundation settlement is in good agreement with the field measured data.Therefore,the rationality of the settlement calculation method is verified.This study can provide reference for the design and construction of light soil subgrade.