柱锤冲扩桩结合排水固结在填海场区地基处理中的应用

Application of Column-hammer Impacting-expanded Piles with Dewatering Consolidation for Foundation Treatment in Sea Reclaimation Area

开山填海场区表层填土粒径不均匀、常伴有大块石,表层以下存在淤泥或淤泥质黏土,这种上硬下软且存在大块石的地层给地基处理带来了很大困难,结合某开山填海场区采用柱锤冲扩桩结合塑料排水板进行地基处理的工程实例,介绍了排水固结与散体挤密桩结合的复合地基处理方案的设计与施工,地基处理取得预期效果的同时,也为开山填海场区的地基处理中提出了一种新的动力排水固结设计理念。

A new foundation treatment technology by adopting column-hammer impacting-expanded piles together with dewatering plastic sheets was developed for sea reclaimation by means of cutting mountain slopes.Grain sizes of the soil are often not uniform,sometimes silt or silty clay together with large boulders are encountered under the ground surface.It is very difficult to treat such ground.The design and construction of such composite foundation treatment using drainage consolidation and compaction of granular pile are introduced with an engineering example.The new method has been proved to be capable of obtaining the desired treatment effects,and to provide a new design concept of dynamic consolidation reinforcement of such projects.