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一、前言在基础设计中,当地基承载力不够时,通常采用桩基、沉箱等深基础形式。对于刚性大的深基础,采用增大地基承载力的方法,似乎没有必要。另外,以直接基础支撑的已成结构物,不管是什么原因引起地基承载力不够时,或者必须增加地基承载力时,新设置深基是很困难的,即便设计出来,其费用也相当高。对于这些情况,可用改善地基承载力的各种方法。日本用灌注水泥浆或化学材料灌浆的方法已很普及,在欧洲则主要采
I. Introduction In the basic design, when the bearing capacity of the local foundation is not enough, pile foundation, caissons and other deep foundation forms are usually used. It seems unnecessary to adopt a method of increasing the bearing capacity of the foundation for a large rigid foundation. In addition, the already-built structure supported by the direct foundation, no matter what causes the foundation bearing capacity is not enough, or must increase the foundation bearing capacity, the new set of deep foundation is very difficult, even if designed, the cost is also quite high. For these situations, various methods of improving the bearing capacity of the foundation can be used. Japan has used irrigation grouting or chemical grouting method has been very popular in Europe, the main mining