日本因国土面积狭小需要有效利用，所以在软地基改良的技术方面经过常年积累具有丰富经验，达到了世界先进水平（见图１）。 迄今为止，在世界范围内的松软的不毛之地，有的被闲置不用，有的正在进行着长期的改良。有效利用软地基土地及回填土地等呼声日渐高涨。事实上许多大型 Because of its narrow land area, Japan needs to make effective use of it. Therefore, Japan has accumulated rich experience in improving the technical aspects of soft foundations and has reached the world advanced level (see Figure 1). So far, the world has been soft and dirty, some have been idle, and some are undergoing long-term improvements. Efforts to make effective use of soft ground and backfill land are on the rise. In fact many large