深厚杂填土区某项目柱锤冲扩桩复合地基的设计与检测

A PROJECT STUDY OF THE DESIGN AND TEST OF COMPOSITE FOUNDATION WITH IMPACT DISPLACEMENT COLUMNS IN THE DEEP MISCELLANEOUS FILL AREA

某项目位于回填鱼塘区域,回填厚度最深处超过8 m。首先对不同的地基处理方案进行了比选,确定了柱锤冲扩桩复合地基方案。柱锤冲扩桩复合地基的初步设计时,结合结构设计要求和工程地质条件对场地进行了分区设计,确定了各区域的桩长和持力层。通过试成孔调整了终孔标准,并增加了换填设计要求。地基处理施工完成后,采用多种检测方法检测其施工质量,通过检测及沉降观测结果判定,本项目采用柱锤冲扩桩方案处理深厚填土是合理可行的,为类似项目的地基处理积累了经验。

A project is located in the area of backfilled fish pond,with the deepest backfilled thickness of more than 8 m.First of all,the different foundation treatment schemes are compared and selected,and the composite foundation with impact displacement columns is determined.In the preliminary design of the composite foundation,the site is designed according to the structural design requirements and engineering geological conditions,and the pile length and bearing layer of each area are determined.After the impacting test,the final impacting standard is adjusted,and the replacement design requirements are added.After the completion of the foundation treatment construction,a variety of detection methods are used to detect the construction quality.According to the results of detection and settlement observation,it is reasonable and feasible and has accumulated experience for the foundation treatment of similar projects.