Research on the technology of design, laying and maintenance for CWR in permafrost regions

Release time:2018-06-25

Journal:Journal of Railway Science and Engineering

Key Words:Golmud—Lhasa Section of Qinghai—Tibet Railway；permafrost regions；continuously welded rails；state index；monitoring system

Abstract:Research purposes：Golmud—Lhasa Section of Qinghai—Tibet Railway in permafrost zone has many unique characteristics，such as low temperature and oxygen，changeable climate，indiscernible four seasons，big day／night temperature difference，long annual negative temperature，stronger solar radiation，more steep gradients，thicker ballast bed，more thawing settlement of subgrade and SO on，which are different to the value and variation laws of state index of CWR．So it is very important and urgent to study the value and variation laws of state index． Research conclusions：(1)The monitoring system for state index of CWR on plateau railway in permafrost zone was developed．This system can gather the temperature and displacement at the same time，and realize the lasting observation and automatic data storage of rail displacement，bridge beam displacement，air temperature，rail temperature and bridge beam temperature．(2)With the CWR monitoring system lay in the permafrost zone，the rail and beam temperature difference value and change laws were revealed．Longitudinal and lateral displacement of rail，relative displacement between beam and rail and beam—ends were evaluated too．(3)It iS proved that the CWR in the permafrost zone is stable and reliable．(4)The research results can be applied in the state monitoring of CWR，and it also has important reference value in ballastless track construction and experimental research on the stability CWR．

Co-author:高亮, 崔日新, 曾志平, 陈宪麦

First Author:张向民

Indexed by:Journal paper

Document Type:J

Volume:33

Issue:05

Page Number:25-31+36

Translation or Not:no