打入桩,桩径较小,水平承载能力很低,人们一般只用它承担垂直荷载,这样可近似按轴向受压构件计算。在轴向受压构件中,用圆形截面也是合理的。钻孔灌注钢筋混疑土桩,桩径一般较大,水平承载能力很大,因此应按在垂直荷载和水平荷载共同作用下的偏心受压构件计算。在偏心受压构件中,圆形截面的力学性能远不如矩形截面好。为改进桩基结构,提高承载能力,应采用矩形钻孔灌注桩。本文论述了矩形钻孔灌注桩的合理性及施工方法。 Drive into the pile, the pile diameter is small, the horizontal carrying capacity is very low, people generally only use it to bear the vertical load, which can be calculated approximately according to the axial compression member. In axial compression members, it is also reasonable to use a circular cross-section. Bored grouting reinforced concrete piles, pile diameter is generally larger, the horizontal carrying capacity is large, so should be calculated according to the eccentric load components under the vertical load and horizontal load. In eccentric compression members, the mechanical properties of the circular section are much less than those of the rectangular section. In order to improve the pile foundation structure and improve the bearing capacity, rectangular bored piles should be used. This paper discusses the rationality and construction method of rectangular bored cast-in-place piles.