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一、前言近年来,日本在沿海和内河建造堤坝时,在防止地基破坏和沉降方面,多是采用深层拌和法加固地基。目前使用的拌和法有两种,一是高压旋喷拌和法,一是机械拌和法。过去两种方法多是采用水泥作为加固材料。但是近几年来,粉体喷射拌和法的使用引起了人们的很大兴趣。所谓粉体喷射拌和法是用压缩空气将粉体材料压送到地下深处与软土拌
I. INTRODUCTION In recent years, when Japan built dams along the coast and inland rivers, most of the measures to prevent foundation damage and settlement were to use deep mixing methods to reinforce the foundation. There are two kinds of mixing methods currently used, one is the high-pressure rotary spray mixing method, and the other is the mechanical mixing method. Most of the past two methods used cement as reinforcement material. However, in recent years, the use of powder jet mixing has aroused great interest. The so-called powder jet mixing method uses compressed air to pump powder material to deep underground and soft soil.