摘要
研究目的:结合现场调查,采用轻型动力触探、K30测试、Evd测试、瑞雷面波法等手段对白阿既有铁路路基基床进行测试,并对测试数据进行分析研究,对现有基床性状进行综合评估,得出提速后路基基床能否继续保持良好状态,研究结论为提速工程的设计和方案比选提供技术依据。研究结论:根据既有线调查、填料成分等,在考虑整体的同时进行既有线路基分段落评价,这样既可以减少数据离散带来的影响,提高评价结果的精度;对于运营多年的白阿铁路线路基基床,承载力和强度不合格处主要集中在基床表层0.0～0.6 m和底层0.6～1.2 m范围内,需要对该深度范围内填料进行重点测试评价;轻型动力触探有操作简单、适用性强的优点,但测试数据离散性较大,如何降低误差是今后需解决的问题;K30相对Evd需要投入大量人力、物力和时间,可以先对不同等级既有线路进行对比试验,探求两者之间的关系,采用Evd替代部分K30测试点以便于提高工作效率;物探瑞雷波速测试法与轻型动力触探法相结合,可以准确揭示路基基床承载力及强度不满足要求的位置和范围,对既有路基基床的现状作出评价。
Research purposes： Based on the on-site investigation,the tests were done to the road base of the existing Baicheng-Aershan Railway with the dynamic penetration test,K30 test,Evd test and spectral analysis of surface waves,and the comprehensive evaluation was carried out to the existing road base by analyzing and studying the test data to prove whether the road base can continue to maintain the good condition or not after the speed-raise for the purpose of providing the technical basis for the design and scheme comparison of the speed-raise project. Research conclusions：Based on the on-site investigation and the composition of subgrade filling of the existing railway,it is necessary to evaluate the subgrade of the existing railway section by section to reduces the negative influence caused by discrete data and improve the accuracy of the valuation results.The defect locations of existing Baicheng-Aershan Railway in bearing capacity and strength mainly concentrate in the range of 0.0~0.6 m of the road base＇s surface and 0.6~1.2 m range of the bottom.The deep filling should be conducted to them in a big range for more test and evaluation.The dynamic penetration test has features of simple operation and wide applicability,but itstest data is of big discreteness and how to reduce the error is the problem to be resolved in future.Compared with the Evd,the K30 requires a lot of human and material resources and much time.The comparative experiment can be done to the existing railways of different grade with these two methods to explores the relation between Evd and K30,and substituting Evd for K30 partially in the test points can improve the work efficiency.The defect position and scope of railway road base in the bearing capacity and strength can be accurately revealled by using the spectral analysis of surface waves along with the dynamic penetration test to evaluate the condition of the existing road base.
出处
《铁道工程学报》
EI
北大核心
2011年第4期15-21,共7页
Journal of Railway Engineering Society
关键词
既有线
路基
基床
测试
评价
existing line
subgrade
road base
test
evaluation
