本文介绍了“孔内深层夯扩挤密桩”用于大厚度黄上、杂填上、液化上、各类软弱上、湿陷性黄上等地基处理的作用机理、设计计算方法和试验测试。该方法能有效地消除黄上的湿陷性并提高地基的强度。同时使用建筑垃圾作为夯填料能大量消纳建筑及工业垃圾，变废为宝，具有良好的经济效益和社会效益。

The "enlarged compaction pile by tamping deep layer of bored hole" had been used on treatment of foundations with large thickness of loess, mixed earthfill, liquefied soil, different kinds of weak soft soil, swelling loess, etc. Their effective mechanism, design calculating methods, test and examinations arc introduced in this paper. This method can eliminate the swelling property of loess effectively and raise the strength of the foundation. At the same time, a large amount of architectural and industry residues are used for tamping and filling materials. There are good economic and social benefits due to convert residues to the useful materials.