Discussion of Design Technology for Subgrade Structure of 40 t Axle-load Heavy Haul Railway

被引：0
|
作者：
Zhang R. [1 ,2 ]
Luo Q. [1 ,2 ]
Xie H. [1 ,2 ]
Jiang L. [1 ,2 ]
Wang T. [1 ,2 ]
机构：
[1] School of Civil Engineering, Southwest Jiaotong University, Chengdu
[2] Key Laboratory of High-speed Railway Engineering, Ministry of Education, Chengdu
来源：
Tiedao Xuebao/Journal of the China Railway Society | 2020年 / 42卷 / 04期
关键词：
40 t axle-load; Four-axis load mode; Heavy haul railway; Subgrade structure; Subgrade work area;
D O I：
10.3969/j.issn.1001-8360.2020.04.017
中图分类号：
学科分类号：
摘要：
According to the technical characteristics of small wheelbase of heavy axle-load freight vehicles, the spatial distribution law of the train load on the subgrade of heavy haul railway was analyzed. Based on the mechanism of the cumulative deformation effect zone caused by the train load along the depth, the interaction between the subgrade structure mainly bearing the train load and the subgrade filler was discussed. According to the requirements of strength, deformation and long-term stability control in engineering design, the design method of subgrade structure under 40 t super-large axial load was discussed. The research shows that the "4z1800/2400" four axis standard axle load model can better reflect the superposition effect of subgrade stress under super-large-axle train loads, The design method with the cumulative deformation effect of subgrade not exceeding the thickness of subgrade, which comprehensively considered the influence of load and filler, is a improvement of the single factor stress ratio method. With the long-term stability of cumulative deformation in slow convergence state as the main control factor, the design index of layered structure of subgrade for heavy haul railway with axle-load of 40 t was proposed. The thickness of subgrade should be 3.5 m. The K30 of subgrade below corresponding subgrade shall not be less than 110 MPa/m. The surface layer of subgrade shall be strengthened with graded crushed stone, with a thickness of 0.7 m. The K30 of bottom layer of subgrade shall be no less than 130 MPa/m. © 2020, Department of Journal of the China Railway Society. All right reserved.
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页码：131 / 139
页数：8
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