我国幅员广大,地基极为复杂,在工程建设中常遇到深层基础加固问题。深层基础加固方法甚多,按传统方法,有木桩、钢筋混凝土桩和钢桩——简称“桩基”。随着科学技术的发展,70年代中期,我国也逐步研究发展了“复合地基”——深层地基加固的桩与天然地基构成的共同受力的基础,使之能够充分或较大程度地发挥天然地基承载力的作用, Our country has a vast area and the foundation is extremely complex. We often encounter deep-rooted reinforcement in the construction of our projects. There are many methods for deep foundation reinforcement. According to the traditional methods, there are wooden piles, reinforced concrete piles and steel piles—referred to as “pile foundations”. With the development of science and technology, in the mid-1970s, China has also gradually studied the development of a “composite foundation”—a foundation of a joint of deep ground-reinforced piles and natural foundations, enabling them to fully or largely use natural resources. The role of foundation bearing capacity,