Study on Dynamic Pressure Distribution of Tunnel Basement Structure of Double Track Heavy Haul Railway under Different Axle Loads

被引：0
|
作者：
Yu L. [1 ]
Zhao Y. [2 ]
Wang M. [1 ]
Li Z. [1 ,3 ]
机构：
[1] School of Civil Engineering, Southwest Jiaotong University, Chengdu
[2] China Railway Economic and Planning Research Institute, Beijing
[3] School of Civil Engineering and Architecture, Chongqing University of Science & Technology, Chongqing
来源：
Tiedao Xuebao/Journal of the China Railway Society | 2020年 / 42卷 / 04期
关键词：
Base structure; Different axle load; Dynamic pressure distribution; Heavy-haul railway tunnel; Vibration excitation test;
D O I：
10.3969/j.issn.1001-8360.2020.04.015
中图分类号：
学科分类号：
摘要：
Based on Fuyingzi tunnel project on Zhangtang heavy haul railway, the vibration excitation test and real-time long-distance monitoring were carried out to study the dynamic pressure distribution and vertical transfer law in the surface of different double track railway tunnel structural layers under 25 t, 27 t and 30 t axle loads under the condition of Class IV grade surrounding rock. According to the typical history curve of soil pressure sensor obtained from the excitation test, the transverse and vertical transfer laws of the dynamic pressure of each structure surface were obtained. Finally, the distribution law of the dynamic pressure of the basement structure at 27 t axle load was compared and verified according to the remote monitoring data. The results show that under the effect of heavy load train, the dynamic pressure of heavy load line is greater than that of passenger line under Class IV rock condition. The dynamic pressure value of different measuring points on each structural plane decreases with the increase of the horizontal distance from the excitation position. The increase of the axle load of the heavy haul train causes the increase of the load under heavy load line, resulting in the instability of the basement structure of the double track railway tunnel. The vertical transfer of dynamic pressure indicates that the contact pressure of surface structure from top to bottom is gradually weakened. The analysis result of the remote measurement data is close to the that of the vibration excitation test. The vibration excitation test results can be used in the design of the base structure of the double track heavy haul railway tunnel. © 2020, Department of Journal of the China Railway Society. All right reserved.
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页码：115 / 122
页数：7
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