强排水复合型动力固结法在铁路路基地基加固中的应用

Application of Mixed Mode of Dynamic Consolidation Method with Forced Drainage for Ground Improvement of Railway Subgrade

强夯法在处理低饱和度的软弱土地基时是一种比较经济、快捷的加固地基方法,但当地下水位埋藏较浅,或地基土处于高饱和度时该法受到了限制。通过真空轻型井点降水的强排水措施,降低地下水位,使地基土体部分得到固结沉降的同时再加以强夯措施,即强排水复合型动力固结法可以突破这种限制。以邯黄铁路一工点为例,阐述该法加固地基的机理,并详细介绍其设计与施工。

As for treating low-saturation soft soil, the dynamic consolidation method （dynamic compaction method ） is an economical and efficient ground improvement method. But when the groundwater level is shallower or the subsoil is in high degree of saturation, the efficiency of this method is limited. However, this limitation problem can be broken through by using the mixed mode of dynamie consolidation method with forced drainage. In this mixed mode, the vaeuum well-point dewatering method is used for lowering the ground water level so that the consolidation settlement in a part of ground soil can be achieved before the dynamic compaction method being used. This paper, taking an actual construction site on Handan-Huanghua Railway as an example, expounds the mechanism of ground improvement with this mixed mode, and introduces in detail its design and construction.