高速铁路桩网复合地基低矮路基动静荷载传递特性研究  

On Static and Dynamic Load Transfer Peculiarity of Low Embankment for High Speed Railway Pile-Net Composite Foundation

作　　者：叶阳升[1,2] 张千里[1,2] 蔡德钩[1,2] 陈锋[1,2] 

机构地区：[1]中国铁道科学研究院铁道建筑研究所,北京100081 [2]中国铁道科学研究院高速铁路轨道技术国家重点实验室,北京100081

出　　处：《高速铁路技术》2010年第1期10-15,共6页High Speed Railway Technology

基　　金：铁道部科技研究开发计划(2007G046)

摘　　要：在某高速铁路低矮路基DK849+557和DK849+575断面(路基高度3.0m和3.2m)进行了路基填筑试验和现场原位1∶1动载模拟试验。路基填筑试验表明,静态填筑荷载应力基本符合半球形理论假设,桩间土应力实测值与计算结果较为一致。550万次模拟动载试验表明,整个过程中路基不同深度处静态应力、动态应力和动变形水平略有波动,土拱基本处于稳定状态;动应力在路基土拱中基本按照均质体进行传递;提出了路基面动荷载引起CFG桩桩网复合地基桩间土应力采用Boussinesq公式进行计算的方法。The subgrade filling test and in - situ 1 ： I dynamic load simulation test are in the DK849 ＋ 557 and DK849 ＋ 575 section of low embankment on a high speed railway with a subgrade height 3.0m and 3.2m. The results from sub- grade filling test prove that the static filling load stress conforms with the theoretical supposal of half ball basically and that the real value measured from soil stress between piles conforms with the computation results. The results from 5 500,000 times simulating dynamic load tests prove that the static stress,dynamic stress and dynamic deformation level in different depth of subgrade are slightly fluctuated in the course of the entire tests and the soil arch is in the stable state basically; the dynamic stress in the soil arch of subgrade is basically transferred as per the isotropic body. This paper proposes such method that the Boussinesq formula is adopted for computing the soil stress induced due to the dynamic load of subgrade pavement between piles in pile-net composite foundation.

关 键 词：高速铁路 桩网复合地基 荷载传递 低矮路基 

分 类 号：U213.11[交通运输工程—道路与铁道工程]