Study on vibration characteristics of a new prestressed subgrade under train loads

被引：0

作者：

Dong J. ^{[1
]}

Leng W. ^{[1
,2
]}

Xu F. ^{[1
,2
]}

Zhang Q. ^{[1
,3
]}

Li Z. ^{[1
,4
]}

Ruan B. ^{[1
,4
]}

Yao K. ^{[1
]}

机构：

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

[2] MOE Key Laboratory of Engineering Structures of Heavy Haul Railway, Central South University, Hunan, Changsha

[3] School of Civil Engineering, Center South University of Forestry and Technology, Hunan, Changsha

[4] Hunan Tieyuan Civil Engineering Testing Co.，Ltd., Hunan, Changsha

来源：

Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | 2023年 / 42卷 / 11期

基金：

中国国家自然科学基金;

关键词：

acceleration response; model test; numerical simulation; prestressed subgrade; reinforcement mechanism; subgrade engineering;

D O I：

10.13722/j.cnki.jrme.2022.1344

中图分类号：

学科分类号：

摘要：

Studying the operation performance and reinforcement mechanism of prestressed subgrades under train loads can provide technical references for engineering design. In this study，a 1∶5 scale model test was performed to explore the effect of the train axle load and the prestress on the acceleration response of the subgrade，and a three-dimensional dynamic finite element model of the prestressed subgrade was then established to analyze the distribution characteristics of the acceleration field and the prestress reinforcement mechanism. The results show that：(1) Under the action of the cyclic train loading，the peak and trough of the vertical acceleration of the subgrade fluctuate in a small range，and their mean value can be used to reflect the long-term vibration degree of the subgrade. (2) At the shoulder of the subgrade，the peak vertical acceleration linearly increases with increasing the train axle load and exponentially decreases with increasing the prestress，and an empirical model is then established to describe the relationship among the peak acceleration，the train axle load and the prestress. (3) The peak vertical acceleration exhibites a highly correlation with the prestress level，and the acceleration significantly attenuates while propagating along the transverse and depth directions of the subgrade. Therefore，the zones around the lateral pressure plate is significantly affected by the prestress comparing with the inner zones of the subgrade. (4) The horizontal prestress could alleviate the vertical vibration of the subgrade，and the core zones of the subgrade can be effectively enhanced by adjusting the prestress level and increasing the subgrade slope rate. The research findings can provide references for further understanding the reinforcement mechanism of the prestressed subgrade. © 2023 Academia Sinica. All rights reserved.

引用

页码：2847 / 2860

页数：13

共 44 条

[1] LENG W M, XIAO Y J, NIE R S, Et al., Investigating strength and deformation characteristics of heavy-haul railway embankment materials using large-scale undrained cyclic triaxial tests[J], International Journal of Geomechanics, 17, 9, (2017)
[2] NIE R S, LI Y F，, LENG W M，, Et al., Deformation characteristics of fine-grained soil under cyclic loading with intermittence[J], Acta Geotechnica, 15, 11, pp. 3041-3054, (2020)
[3] LENG Wuming, NIE Rusong, YANG Qi, Et al., A new type of prestressed embankment structure and its properties[J], Journal of the China Railway Society, 38, 11, pp. 111-119, (2016)
[4] ZHANG Q S，, LENG W M, Et al., Additional stress in soil embankments subjected to a new prestressed reinforcement device[J], Journal of Civil Engineering and Management, 25, 7, pp. 700-714, (2019)
[5] XU F, LENG W M, NIE R S, Et al., New structure for strengthening soil embankments[J], Advances in Civil Engineering, 2018, (2018)
[6] ESMAEILI M，, ARBABI B., Railway embankments stabilization by tied back-to-backsystem[J], ComputersandGeotechnics, 67, pp. 110-120, (2015)
[7] ESEN A F, WOODWARD P K, LAGHROUCHE O, Et al., Full-scale laboratory testing of a geosynthetically reinforced soil railway structure[J], Transportation Geotechnics, 28, (2021)
[8] ZHU D Y, LEE C F，, CHAN D H，, Et al., Evaluation of the stability of anchor-reinforced slopes[J], Canadian Geotechnical Journal, 42, 5, pp. 1342-1349, (2005)
[9] KANG H P, WU Y Z，, GAO F Q., Deformation characteristics and reinforcement technology for entry subjected to mining-induced stresses[J], Journal of Rock Mechanics and Geotechnical Engineering, 3, 3, pp. 207-219, (2011)
[10] GAO F Q, KANG H P., Effect of pre-tensioned rock bolts on stress redistribution around a roadway：insight from numerical modeling[J], Journal of China University Mining and Technology, 18, 4, pp. 509-515, (2008)

← 1 2 3 4 5 →