Evaluation and analysis of service performance of railway yard subgrade in cold regions

SONG Hongfang; WANG Tianliang; YUE Zurun; YAN Han

doi:10.11860/j.issn.1673-0291.2017.01.004

Abstract：Based on the analysis of station subgrade of Qinghai-Tibet railway Naqu logistics center,12 factors that have great influences on service performance are adopted as the evaluation indexes from 5 aspects,which are frozen soil type,temperature,hydrology,geology,and engineering conditions,and a service performance evaluation system of railway yard subgrade in cold regions is established.Reliability theory is introduced on the basis of considering the relationship between affecting factors,and a fuzzy comprehensive evaluation method of railway yard subgrade is set up by adopting analytic hierarchy process and fuzzy mathematics theory.The service performances of subgrade in heaped cargo area,station area and road area are evaluated,and the service performances of station subgrade after 10 years are predicted with this method.The results show that the subgrade in heaped cargo area has a good service performance and gets a good score due to the condition of no-load.The subgrade in station area gets a relative good score and meets the requirements of service performance.The subgrade in road area gets a poor score,which is consistent with the situation of in-situ serious diseases.The service performance of subgrade in heaped cargo area gets worse caused by full cargo condition,but the service performances of subgrade in station area and road area get better due to maintenance after 10 freeze-thaw cycles.The effective maintenance measures are prerequisites to ensure the service performance in railway yard subgrade.