从南京某基坑位移超限出发,探讨了规范中桩身弯矩取值偏低,及坑上局部和锚固段抗弯刚度取值偏高两个问题,这是影响基坑安全和桩顶位移超限的两个重要原因。该文提出了圆截面钢筋混凝土桩抗弯刚度取值的一个方法,与工程实测位移吻合较好。 Starting from the displacement overrun of a foundation pit in Nanjing, the problems of low bending moment of the pile body in the code, and the high value of flexural rigidity of local and anchored sections in pits are discussed. This is a problem that affects the safety of foundation pits and the pile top Two major causes of displacement overrun. In this paper, a method of evaluating the flexural rigidity of circular section reinforced concrete piles is proposed, which is in good agreement with the measured displacements.