青藏铁路风火山地段路基病害特征及防治措施研究

近年来,山区高填方斜坡路基发生病害成为青藏铁路一种新的线路病害类型,对青藏铁路的运营造成了安全隐患,需要对其进行针对性研究。以该类病害发生较为典型的风火山地区某路段作为研究对象,采用收集地质、气象等资料和进行现场调查、地质勘探、试验相结合的方法,进行病害特征及防治措施研究。研究结论:将其病害特征归纳为路基下坡侧坡脚渗水、路基坡体出现开裂、路基沉降明显3个方面。并从地形因素、地质条件、水位气象因素、冻土地质环境4个方向对病害产生原因进行了综合分析。在此基础上提出了加固路基坡体、完善防排水系统、加强热防护措施和加强安全监测等防治措施建议。

Research on Subgrade Defects of Fenghuoshan Section on Qinghai-Tibet Railway and Countermeasures

In recent years, subgrade defects occur frequently in highfill slope embankment of Qinghai-Tibet railway,which results in potential risks to the traffic. It is necessary to conduct researches about it. Eith reference to the typical Fenghuoshan area,yhis paper addresses the issue,by collecting geological and atmospheric data,field investigation and experiments. The research results show that the defects fall into three categories,including water seepage at subgrade slope,subgrade slope cracking and subgrade settlement. The causes are analyzed in terms of topographical factor, geologic factor,hydrometeorological factor and permafrost environment. Based on the analysis,treatment measures are recommended to reinforce roadbed slope,improve drainage system,and strengthen heat-protection and monitoring.