摘要
温度、土质和路基含水量是影响城市道路冻胀的主要因素,研究路基冻胀的影响因素,对保持路基稳定、控制路基沉降、提高路基耐久性具有重要作用。本文针对这三种因素采用有限差分软件FLAC3D对路基的冻胀过程进行模拟。结果表明:持续缓慢的负温会引起土体冻结速率加快,冻深加大,冻胀作用增强;冻胀敏感性土是路基产生冻胀的条件之一,颗粒越小,冻胀性越强;路基冻胀与路基含水量关系密切,只有路基的初始含水量超过起始冻胀含水量时,路基冻胀才会发生,路基冻胀量随含水量增加而增大。
Temperature, soil and roadbed water content are the main impact tactors in urban roact frost heaving. It has an important role to maintain a stable roadbed, control roadbed settlement and im- prove the roadbed durability. In this paper, we using the finite difference software FLAC3D to simulate the roadbed frost process under these factors. The results showed that ： continuous slow negative tempera- ture can speed up soil freezing rate, increase deep freeze, enhance frost; frost susceptibility of roadbed soil is one of the conditions to produce frost, the smaller the particle, the strorger frost heaving; frost heaving roadbed is closely related to water content, frost heaving will occur only when is more tham the initial water content, roadbed frost water content, the amount of frost heaving is moreased with water content increase.
出处
《低温建筑技术》
2015年第12期110-112,共3页
Low Temperature Architecture Technology
基金
住房和城乡建设部研究开发项目资助(2012-K3-16)
关键词
温度
土质
含水量
路基冻胀
数值模拟
temperature
soil
water content
roadbed frost heaving
numerical simulation
