铁道标准设计2019，Vol.63Issue(1)：10-15,6.DOI:10.13238/j.issn.1004-2954.201803270006
翻浆状态下无砟轨道路基动力响应特征模型试验研究
Model Experimental Study on Dynamic Response Characteristics of Ballastless Track Subgrade Subject to Mud Pumping
摘要
Abstract
Mud pumping is a special new defect of ballastless track subgrade of high-speed railway, and it has remarkable effects on the comfort and safety of high-speed railway operation. In order to analyze the influences of mud pumping of subgrade bed on the dynamic characteristics of ballastless track subgrade, a large-scale model test of the ballastless track and subgrade bed was carried out. The results show that when the top layer of the subgrade bed suffers mud pumping, the base plate has a transient impact on the top layer of the subgrade bed under the dynamic load, causing the soil dynamic pressure to increase with the increase of the loading times and the attenuation rate along the depth becomes faster. Mud pumping can change the dynamic transmission characteristics between the top layer of the subgrade bed and the base plate. Compared with the top layer of the subgrade bed without mud pumping, the vertical vibration acceleration and displacement ratios of the base plate to seal layer of the subgrade bed are increased by more than 1. 95 and 4. 56 times respectively. The attenuation gradient of the vibration response from the base plate to the top layer of the subgrade bed increases. Mud pumping deteriorating under dynamic loading can reduce the bearing capability of the top layer of the subgrade bed to the base plate, which can result in vibration intensification of the ballastless track and subgrade bed.关键词
铁路路基/无砟轨道/模型试验/基床表层/翻浆/动力响应Key words
Railway subgrade/Ballastless track/Model test/Top layer of subgrade bed/Mud pumping/Dynamic response分类
交通工程引用本文复制引用
孙立,杨威,黄俊杰,苏谦..翻浆状态下无砟轨道路基动力响应特征模型试验研究[J].铁道标准设计,2019,63(1):10-15,6.基金项目
中国铁路总公司科技研究开发计划课题(J2016Z019) （J2016Z019）
