铁道科学与工程学报2017，Vol.14Issue(7)：1347-1353,7.
高速铁路无砟轨道膨胀土地基膨胀量计算模型
Calculation model of expansive soil foundation for ballastless track of high-speed railway
摘要
Abstract
Swelling deformation value of high speed ballastless track is strictly required. The expansion and contraction deformations of foundation not only threaten the operational safety and comfort, but also adversely affect the serviceability and service life of high-speed railway lines. However, the expansive soil foundation is the undisturbed expansive soil. The deformation of undisturbed expansive soil under the second line of Lanzhou to Xinjiang Railway was studied. Different overloading scenarios were applied to three different thicknesses with different water contents in order to measure the deformation of undisturbed expansive soil. The test results show that the greater the thickness of the expansive soil, the greater the amount of expansion. The overlying load would have a restraining effect for expansion of undisturbed expansive soil. When the load is greater, the amount of expansion is less. When the load is larger, the larger the amount of the load is. The expansion of soil samples can be divided into slow growth stage, rapid growth stage and slow growth stage with the increase of water content. When the thickness is constant, the model of undisturbed expansive soil was established under the water content increment and overburden load. According to the parameters of the formula, the calculation model of expansive soil expansive soil under the coupling effect of water content, overburden load and thickness was established based on the three factors. The calculated results agreed well with the measured data, which provides some theoretical support for the project construction of the high speed railway in the future.关键词
高速铁路/原状膨胀土/膨胀量/含水率/上覆荷载/厚度/计算模型Key words
high-speed railway/undisturbed expansive soil/process expansion/water content/overlying load/thickness/calculation model分类
建筑与水利引用本文复制引用
薛彦瑾,王起才,张戎令,王冲,王炳忠,李进前..高速铁路无砟轨道膨胀土地基膨胀量计算模型[J].铁道科学与工程学报,2017,14(7):1347-1353,7.基金项目
长江学者和创新团队发展计划资助项目(IRT15R29) （IRT15R29）
中国铁路总公司科技研究开发计划资助项目(Z2015-G001) （Z2015-G001）
中国科协青年人才托举工程资助项目 （）
陇原青年创新人才扶持计划资助项目 （）
兰州交通大学优秀平台资助项目(201606) （201606）
