严寒地区高速铁路路基冻胀和工程对策研究

	严寒地区高速铁路路基冻胀和工程对策研究
Alternative Title	Research on Subgrade Frost Heave of High-speed Railway in Cold Regions and Its Engineering Countermeasures
	石刚强
Subtype	博士
Thesis Advisor	张鲁新
	2014-05-30
Degree Grantor	兰州大学
Place of Conferral	兰州
Degree Name	博士
Keyword	高速铁路季节冻土路基冻胀工程对策
Abstract	论文通过研究2012-2013年哈大高铁开通前后出现的路基冻胀现象及采取的整治措施，主要有以下创新结论：（1）严寒地区高速铁路路基季节冻胀具有普遍性和特殊性。（2）哈大高铁路基冻胀变形可分为冻胀初始波动、冻胀快速发展、冻胀稳定发展和波动融沉四个发展阶段，路基普遍发生冻胀但变形处于可控状态；路基冻胀变形以上层冻胀为主，路基的冻胀变形程度与路基结构有关，整体上全线过渡段冻胀轻微，路堤次之。（3）路基设计冻深应根据具体工点情况综合确定，电缆槽不宜设置在无砟轨道路肩上。（4）含水量是影响路基填料冻胀率的主导因素，掺水泥5%以上级配碎石硬化后基本消除了级配碎石中细粒土的冻胀敏感性，提出两种新型路基防冻胀结构。（5）基于路基季节冻胀的普遍性已采取的防冻胀措施对季节冻胀变形起到消除、减缓的作用。（6）针对路基季节冻胀的特殊性，以控制基床表层冻胀变形为整治工作的主要思路，观测数据表明所采取的措施防治季节冻胀初步效果明显。目前夏季开行300km/h的高速动车组和冬季开行200km/h的动车组列车且安全平稳运行，证明所采取的季节冻胀防治工程对策对于解决严寒地区高速铁路路基冻胀问题是有效的和可靠的。
Other Abstract	By studying on phenomenon of subgrade frost heave and improvement measures the HDHR opening in 2012-2013 year, the main innovative result are listed as follows: (1) The seasonal frost heave of high-speed railway subgrade in cold regions has the particularity and widespread. (2)The development of the frost heave includes the frost heaving occurring volatility，the rapid growing stage, the stable frost heaving stage and the thawing settlement stage. The frost heaving deformation main exists in upper of subgrade bed and deformation level related to the subgrade structures. （3）We should be determined comprehensively the maximum frozen depth according to the specific worksite situation in the design. （4）After graded crushed stone mixing cement by more than 5%, hardening of the rubble basically eliminated the fine grained soil frost heave sensitivity. (5) Because of the universality of seasonal frost heave, there had effect on eliminating and reducing the deformation of seasonal frost heave. (6) Because of the particularity of seasonal frost heave，observation data indicates that measures to prevent and treat seasonal frost heave obtained obvious effect.
URL	查看原文
Language	中文
Document Type	学位论文
Identifier	https://ir.lzu.edu.cn/handle/262010/225826
Collection	土木工程与力学学院
Recommended Citation GB/T 7714	石刚强. 严寒地区高速铁路路基冻胀和工程对策研究[D]. 兰州. 兰州大学,2014.

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