一、前言 近几年来桩基础的应用有了很大的发展,如在上海几乎所有的重型厂房、高层建筑、深水码头基础等都打有钢筋混凝土桩,一般桩长都在20米以上。又由于接桩技术的发展,桩的长度可根据需要放得很长。同时桩的结 I. INTRODUCTION The application of pile foundations has been greatly developed in recent years. For example, almost all heavy-duty powerhouses, high-rise buildings, and deep-water wharf foundations in Shanghai have reinforced concrete piles. The general pile length is more than 20 meters. Due to the development of the pile-jointing technology, the length of the pile can be lengthened as needed. Pile of knots at the same time