云桂高速铁路不同防水层基床动力特性现场试验  

IN-SITU TEST ON DYNAMIC CHARACTERISTICS OF CUTTING SUBGRADE WITH DIFFERENT WATERPROOF LAYERS ALONG YUN-GUI HIGH-SPEED RAILWAY

作　　者：杨果林[1] 王亮亮[1] 房以河[1] 徐亚斌[1] 汪鹏福[1] 

机构地区：[1]中南大学土木工程学院,湖南长沙410075

出　　处：《岩石力学与工程学报》2014年第8期1672-1678,共7页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金资助项目(51278499);铁道部科技研究开发计划课题(2010G016–B);湖南省研究生科研创新项目(CX2012B062)

摘　　要：结合云桂(昆明—南宁)铁路典型膨胀土路堑基床综合试验段的大型激振试验,分析不同防排水层基床在极端服役环境(干燥和浸水)下的动力特性。试验结果表明:(1)服役环境影响基床动力特性参数(动应力、速度和加速度)的绝对值大小,但不影响其衰减规律,动力特性参数的衰减规律与防水结构层刚度有关;(2)相比于改性水泥基防水结构层剖面,在距激振设备6 m范围内,复合防排水板剖面路基面的动位移相对较大;(3)改性水泥基防水结构层具有较大刚度和良好的抗渗性,能够有效解决复合防排水板易破损和搭接缝渗漏问题,这对保证膨胀土路堑基床的长期稳定性具有重要意义。In-situ dynamic tests on cutting subgrade of expansive soil were carried out to investigate the dynamic characteristics of the cutting subgrade with different waterproof layers under extreme service environments. the results show that service environments were found to affect the values of dynamic characteristic parameters （dynamic stress,velocity and acceleration）,and that the attenuation of the dynamic characteristic parameters is related to the stiffness of waterproof structure layers. Compared to that of the subgrade section with the waterproof layers of cement-based compound material,the dynamic displacement of the subgrade surface with the compound waterproof plates is bigger. The modified cement-based waterproof structure layers has large stiffness and excellent anti-permeability,which would desirably solve the problems of lap seam leaking and the mechanic damage of the compound waterproof plate in the process of building,and this is important to the long-term stability of the cutting subgrade in expansive soil area.

关 键 词：土力学 膨胀土 防水层 动力特性 现场试验 高速铁路 

分 类 号：TU43[建筑科学—岩土工程]