一、前言 我国港口工程中使用的钢筋混凝土桩,一般都设有桩尖。设置桩尖主要有三个作用:第一,引导桩身以保持正确的位置;第二,利于沉桩;第三,保护桩身底部附近不易产生纵向裂缝或角点破损。然而,桩尖的设置增加了制桩工序和费用,对于预制质量欠佳的歪斜桩尖,还会引起桩身贯入时的偏斜,反而起到相反的作用。 近年来,平底桩在一些国家中已有较广 I. Introduction The reinforced concrete piles used in port engineering in our country are usually equipped with pile-tip. There are mainly three roles in setting the pile tip: first, guiding the pile body to maintain the correct position; secondly, favoring the pile sinking; thirdly, longitudinal cracks or corner breakages are not easily generated near the bottom of the pile body. However, the setting of the pile tip increases the pile making process and the cost, but also causes the deflection when the pile penetrates into the pile tip with poor prefabricated quality, and on the contrary, it plays the opposite role. In recent years, flat-bottomed piles have been widely used in some countries