本文将详细介绍夯扩桩的工作原则、设计、施工与检测。由于桩端持力层能提供较大桩端阻力,夯扩桩是代替长春应用最广泛的沉管灌注桩和钢筋混凝土预制桩最为经济适用的一种能提供较大承载力的沉管扩底桩。夯扩桩是在扩底桩与廉价的沉管灌注桩基础上发展起来的,是以桩端夯扩头支承为主、桩侧摩擦力为辅的扩底灌注桩。夯扩桩自1981年在杭州试验成功并形成一整套施工工艺后,逐渐向江苏、浙江、山东、湖北、广东、辽宁等地推广应用。目前,建设部颁布的《建筑桩基技术规范》已包括了夯扩桩的设计、施工及检测等要求。某些地区根据本地特点也相应地制定了适应于本地区的夯扩桩规范。 This article will detail the working principle, design, construction and testing of the rammed expanded pile. Because of the pile-end holding layer can provide greater pile end resistance, rammed expanded pile is the most widely used in Shenyang pipe instead of perfusion pile and reinforced concrete precast pile is the most economical and affordable to provide a larger bearing capacity of the sinking pile. The rammed-expanded pile is developed on the basis of expanded-bottom pile and low-cost immersed-pipe grouting pile, which is a bottom-expanded grouting pile which is mainly supported by the expanded end of the pile end and supplemented by the friction on the pile side. The rammed expansion pile has been successfully applied to Jiangsu, Zhejiang, Shandong, Hubei, Guangdong and Liaoning since it was successfully tested in Hangzhou in 1981 and has formed a complete set of construction technology. At present, the “Technical Specification for Construction Piles” promulgated by the Ministry of Construction has included the requirements of design, construction and testing of rammed expanded piles. In some areas, the specifications of rammed-expanded piles that are adapted to the region have also been formulated according to local characteristics.