Model test of subgrade mud-pumping of ballastless track for high-speed railway

被引：0

作者：

Leng W. ^{[1
,2
]}

Li Y. ^{[1
]}

Nie R. ^{[1
,2
]}

Su Y. ^{[1
]}

Dong J. ^{[1
]}

Cheng L. ^{[1
]}

机构：

[1] School of Civil Engineering, Central South University, Changsha

[2] National Engineering Laboratory for High Speed Railway Construction (Central South University), Changsha

来源：

Harbin Gongye Daxue Xuebao/Journal of Harbin Institute of Technology | 2021年 / 53卷 / 03期

关键词：

Ballastless track; Hydrodynamic pressure characteristics; Influencing factors; Model test; Subgrade mud-pumping;

D O I：

10.11918/201907040

中图分类号：

学科分类号：

摘要：

To investigate the subgrade mud-pumping of ballastless track for high-speed railway, a full-scale model test system was built. The moisture content, matric suction, and excess pore water pressure of the subgrade during the process of subgrade mud-pumping were measured, the hydrodynamic pressure characteristics of the subgrade were analyzed under dynamic loads induced by high-speed trains, and the mechanism and influencing factors of subgrade mud-pumping of ballastless track were evaluated. Results show that the subgrade surface layer of ballastless track was basically saturated after rainfall infiltration. The mud-pumping was likely to happen under the dynamic loads of high-speed trains. The subgrade mud-pumping occurred with an increase in excess pore water pressure, and the increment of excess pore water pressure was constant in the mud-pumping region with an increase in the depth of subgrade surface layer. In saturated situation, the excess pore water pressure of the subgrade on both sides of the concrete base was higher than that below the center line of the subgrade, making mud-pumping more likely to occur. Reducing the water content or pore water pressure of subgrade can be an effective way to control and prevent the occurrence of subgrade mud-pumping. Copyright ©2021 Journal of Harbin Institute of Technology.All rights reserved.

引用

页码：118 / 126

页数：8

共 23 条

[1] HU Yifeng, LI Nufang, Theory of ballastless track-subgrade for high-speed railway, (2010)
[2] ZHAO Guotang, High-speed railway ballastless track structure, (2006)
[3] PHAM D P., Study on the mud pumping mechanism and reinforcement effect for gravel in high-speed railway ballastless track surface layer of subgrade bed[D], (2015)
[4] ZHANG Wenchao, SU Qian, LIU Ting, Et al., Research on vibration characteristics of ballastless track subgrade under frost boiling at subgrade bed, Rock and Soil Mechanics, 35, 12, (2014)
[5] ALOBAIDI I, HOARE D J., Factors affecting the pumping of fines at the subgrade subbase interface of highway pavements: a laboratory study, Geosynthetics International, 1, 2, (1994)
[6] ALOBAIDI I, HOARE D J., The development pore water pressure at the subgrade-subbase interface of a highway pavement and its effect on pumping of fines, Geotextiles and Geomembranes, 14, 2, (1996)
[7] DUONG T V, CUI Y J, TANG A M, Et al., Investigating the mud pumping and interlayer creation phenomena in railway sub-structure, Engineering Geology, 171, (2014)
[8] DUONG T V, CUI Y J, TANG A M, Et al., Effect of fine particles on the hydraulic behavior of interlayer soil in railway substructure, Canadian Geotechnical Journal, 51, 7, (2014)
[9] CHAWLA S, SHAHU J T., Reinforcement and mud-pumping benefits of geosynthetics in railway tracks: model tests, Geotextiles and Geomembranes, 44, 3, (2016)
[10] CHAWLA S, SHAHU J T., Reinforcement and mud-pumping benefits of geosynthetics in railway tracks: numerical analysis, Geotextiles and Geomembranes, 44, 3, (2016)

← 1 2 3 →