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前言利用振冲器的径向振动和中空轴端射出的压力水流所组成的振动水冲作用,对于砂性地基的加心效果很好,特别是对饱和砂层液化危害的固实处理效果更佳。这是由于振冲外力使砂土颗粒间的摩擦力迅速减小、出现短暂液化,砂土颗粒重新紧密排列,使孔隙比减至原砂土临界孔隙比以下,因此能阻止砂层再度液化。加之,振冲孔由回填砾石(碎石或碎砾石或粗砂)形成的振冲桩,具有较大的承载力和排水井作用,当遇到地震时,可防止因冒水喷砂引起建筑物不均匀沉陷破坏。振冲后形成的复合地基,一般可提
Preface The use of vibration and vibration of the hollow shaft hollow end of the pressure water jet vibration composed of water for the sand-based foundation of the heart effect is very good, especially for saturated sand liquefaction of the solid treatment effect is more good. This is due to the vibration external force sand particles quickly reduce the friction between the occurrence of a brief liquefaction, sand particles re-arranged so that the porosity ratio to reduce the critical porosity of the original sand than the following, thus preventing the sand again liquefaction. In addition, vibrating punching pile is formed by backfilling gravel (gravel or crushed gravel or coarse sand), which has larger bearing capacity and drainage well effect, and can prevent building caused by sand blasting Uneven subsidence damage. Vibration formed after the composite foundation can be mentioned