Study on Effect of Frost Heaving Suppression of New Type of Thermal Insulation Strengthening Layer for High-speed Railway Subgrade in Cold Region

被引：0
|
作者：
Liu X. [1 ]
Yue Z. [2 ]
Hu T. [2 ]
机构：
[1] Postgraduate Department, China Academy of Railway Sciences, Beijing
[2] State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures, Shijiazhuang Tiedao University, Shijiazhuang
来源：
Tiedao Xuebao/Journal of the China Railway Society | 2022年 / 44卷 / 02期
关键词：
Foam concrete; Frost heaving; High-speed railway subgrade; Thermal insulation and high strength;
D O I：
10.3969/j.issn.1001-8360.2022.02.014
中图分类号：
学科分类号：
摘要：
In view of the poor durability of EPS, XPS and PU boards as well as the poor effect of local thermal insulation measures for subgrade of high-speed railway in cold regions, a new type of thermal insulation and high strength fly ash cement foam concrete mixed with silty sand was used as the whole section thermal insulation structure on the surface and side slopes of the high-speed railway subgrade. First of all, taking the proportioning ratio as the test variable, by means of freeze-thaw durability test, compression test, flexural test and thermal conductivity test, a comprehensive analysis of the physical and mechanical properties of foam concrete was carried out to obtain the best mix proportion. On this basis, the anti-frost heaving effect of the whole section insulation subgrade structure was analyzed by finite element simulation. The results show that the optimum mix proportion of the new foam concrete is 40% of cement, 50% of fly ash and 10% of silty sand. The whole section of the new thermal insulation subgrade structure that is laid with 10 cm best performance foam concrete thermal insulation strengthening layer, and 50 cm silty sand layer on both sides of the subgrade slope, has good thermal insulation effect, effectively inhibiting the frost heave of the subgrade. © 2022, Department of Journal of the China Railway Society. All right reserved.
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页码：108 / 116
页数：8
相关论文
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