中国铁道科学2017，Vol.38Issue(6)：9-15,7.DOI:10.3969/j.issn.1001-4632.2017.06.02
微冻胀填料中填充料冻胀与骨架颗粒的相互作用机制
Interaction Mechanism of Filling Material and Skeleton Particle in Micro Frost Heaving Filler
摘要
Abstract
To solve the problem about the influence of subgrade frost heaving on the riding comfort of high speed railway in seasonal frozen soil area,the influence of various factors such as the filling material,water content and external load on micro frost heaving filling material has been studied using the combined method of laboratory test and theoretical analysis,and the interaction mechanism between the filling material and skeleton particle in the process of frost heaving has been analyzed.Research shows that the micro frost heaving filler consists of coarse skeleton,filling material between skeleton particles and residual pore without filling.When the filler filling rate is 0.25,the initial macro frost heaving occurs in filling material.The frost heaving can be inhibited by the overlying load.The volume of coarse particle skeleton with large rigidity does not change in the process of frost heaving,but the volume expansion of filling material has the function of filling the residual pore between skeleton particles and uplifting the skeleton particle,and macro frost heaving occurs.The absorptive function is strong and the uplift function is cut down when the skeleton particles remain large porosity,and the uplift function makes the gap between the skeleton particles increase,thus promotes the development of filling function for filling material.The filling function of filling material is obvious when the skeleton structure is stable.The process of frost heaving of micro frost heaving filling material is actually a dynamic balance process between the filling function and uplift function of filling material.关键词
冻土路基/季节性冻土/微冻胀填料/骨架颗粒/填充料/冻胀机理Key words
Frozen soil subgrade/Seasonal frozen soil/Micro frost heaving filling material/Skeleton particle/Filling material/Mechanism of frost heaving分类
交通工程引用本文复制引用
杜晓燕..微冻胀填料中填充料冻胀与骨架颗粒的相互作用机制[J].中国铁道科学,2017,38(6):9-15,7.基金项目
中国铁道科学研究院行业服务技术创新项目(2016YJ037) （2016YJ037）
太原铁路局科技研究开发计划项目(HGKL-05,2017G06) （HGKL-05,2017G06）
