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强力夯实法(简称强夯法),是七十年代新发展起来的一种地基加固方法。在法国首先采用此法处理填土、饱和砂土、冲积土以及软土地基,均获得成功。以后在世界几十个国家得到推广使用。我国至今已有近百项工程采用此法加固地基,取得了不同程度的加固效果。大量的工程实践证明,强夯法具有设备简单、适用面广、快速,经济、效果好等优点,为地基加固开辟了一条新路。 强夯法是用巨大的冲击能量使地基土产生强烈的振动和很高的应力,导致土中孔隙减少,水压上升强度降低,土体局部液化。夯击点周围产生裂缝,形成树枝状良好排水通道(图1),孔隙水顺利逸出,使土体迅速固结,以达到减少沉降、提高承载能力的目的。
The powerful compaction method (abbreviated as the “dynamic compaction method”) is a method of foundation reinforcement newly developed in the 1970s. In France, this method was first used to treat fills, saturated sands, alluvial soils, and soft grounds, all of which were successful. Later in the world dozens of countries have been promoted to use. Up to now, nearly 100 projects in China have used this method to reinforce the foundation and achieved different degrees of reinforcement. A large number of engineering practices have proved that the strong tamping method has the advantages of simple equipment, wide application, rapidness, economy, and good effect, and opens up a new road for the reinforcement of the foundation. The dynamic compaction method uses huge impact energy to make the foundation soil produce strong vibration and high stress, resulting in the reduction of the porosity in the soil, the decrease of the water pressure rising strength, and the local liquefaction of the soil. Cracks are generated around the sniper points, forming a good dendritic drainage channel (Figure 1), pore water smooth escape, the rapid consolidation of the soil, in order to achieve the purpose of reducing the settlement and improving the carrying capacity.