寒区铁路站场路基服役性能评价与分析

通过对青藏铁路那曲物流中心站场路基的分析,从冻土类型、温度、水文、地质及工程条件5个方面选取了12项对路基服役性影响较大的因素作为评价指标,建立了冻土区铁路站场路基服役性能评价体系.在充分考虑各影响因素间关系的基础上引入可靠度理论,结合层次分析法和模糊数学理论建立车站站区路基服役性能的模糊综合评价模型.利用此方法对货物堆载区、车站站区和道路区进行评价,并对铁路站场路基10年后的服役性能进行预测.结果表明:受到堆载区空载的影响,货物堆载区评价得分高,服役性能好;车站站区评价得分较高,服役性能满足要求;道路区的评价得分低,服役性能差,符合现场道路病害严重的情况;经历10次冻融循环后,由于大宗货物堆载的原因,堆载区服役性能降低,经养护维修后,车站站区和道路区服役性能提高,说明有效的养护和维修措施是保证站场路基服役性能正常发挥的前提条件.

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

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.