中等压缩性土短桩-网复合地基变形现场测试特性

Deformation characteristics of short pile net composite foundation with medium compression soil by field test

为优化高速铁路中等压缩性土地基处理方案,依托赣龙高速铁路试验段,采用现场试验及理论分析方法,研究了短桩网复合地基的变形特性,并与天然地基进行对比。结果表明:复合地基加固区沉降占总沉降的62%~75%;地基侧向位移主要发生在预压土堆载期,20m深度范围是主要的侧向位移层,在相似条件下,复合地基与天然地基沉降主要发生的时间、主要的沉降土层厚度及路基横断面沉降差异较大。结果显示了短桩网复合地基可有效控制中等压缩性土地基变形。

In order to optimize the processing scheme of medium compression soil foundation,the short pilenet composite foundation deformation characteristics is explored using the method of field test and theoretical analysis on a test section of Ganlong high-speed railway,and it’s compared with the natural foundation.It is shown that the settlement of composite foundation reinforced area is 62%~75% of total settlement,the lateral displacement mainly occurred in preloading soil loading period and 20 mdepth is the main layer.Under similar conditions,the main stage of settlement,the main settlement layer thickness and settlement of cross section are quite different between composite foundation and natural foundation.The results show that the short pile-net composite foundation can effectively control the deformation of the medium compression soil foundation,which can provide reference for similar projects.