既有线重载铁路路桥过渡段路基基床病害及整治措施研究

重载铁路路桥过渡段由于刚性桥台结构物和柔性路堤连接处所产生的刚度差,以及在桥台台尾连接地段因重载列车行车荷载的反复作用,使得静态不平顺、动态不平顺同时存在的条件下,填土在固结沉降过程中易产生较大的差异沉降。这一现象将随着车速的提高和轴重的增大而加剧。因此,对重载铁路过渡段轨下基础的研究具有异常重要的意义。发展重载铁路,路基压实质量的好坏直接影响运输的安全和效能,但长期在

RESEARCH ON BED DEFECTS IN RAILWAY-BRIDGE ABUTMENT SUBGRADE AND THEIR TREATMENT IN EXISTING HEAVY-LOAD RAILWAY LINE

For railway-bridge abutment, the fill soil is easy to produce large different settlement in the course of consolidation settlement when the static state and dynamic state irregularity are all concurrent. It is because there is a stiffness difference in the linking part of abutment structure and soft embankment and the repeating action of train loading in abutment trail. This phenomena will become serious with the increasing of train's velocity and axle load. Therefore, it is very important to study the foundation under rail of high speed railway abutment. On the other hand, Subgrade compaction quality has a direct influence on the heavy load railway and its transportation safety. Because the need of the fill soil using in subgrade and the compaction standard is low as well as the checking frequency is little, the existing railway line subgrade technique and state is bad which has become the main weak aspect of the railway and threaten the safety of transportation. And the work which have been done is introduced in this paper and is used for reference of the methods. Firstly, based on the railway ministry project-existing railway line railway-bridge abutment subgrade and rail strengthen research, we have tested Shuo-Huang railway 170th bridge and railway-bridge abutment subgrade in field. The testing projects include geology seismic test. The results reflect the subgrade quality and problems behind this abutment. Then the countermeasures are brought forward to strengthen the subgrade aspects which need deal with. The plane piles and slanting piles are used associatively has a more obvious effect. The strengthening impact is also simulated by FE procedure and the results are satisfied.