Correcting method for high speed railway ballastless track subgrade in soft soil area

Abstract

The invention discloses a correcting method for high speed railway ballastless track subgrade in a soft soil area. The correcting method comprises the following steps that 1, when the lateral displacement of the high speed railway embankment occurs , a deformation groove and a plurality of stress relief apertures are formed in an asymmetrical load region, the deformation groove is filled with rigid foam, and the stress relief apertures are filled with grits and rubbles; 2, a first row jet-grouting pile is arranged in a second soft stratum area, the instantaneous injection pressure generated by the construction of the first row jet-grouting pile is utilized to drive a pile foundation reinforcement area located at the bottom of the high speed railway embankment to conduct the displacement from the second soft stratum area to a first soft stratum area, the pile foundation reinforcement area drives a subgrade reinforcement bed course located above the pile foundation reinforcement area and the high speed railway embankment to move simultaneously, and the correcting for the high speed railway subgrade is achieved; 3, the deformation groove is densely filled with the rubbles plus 5% of cement. An acting force is applied on subgrade deeps, the subgrade drives the subgrade body to conduct a movement, so that the purpose of correcting the lateral displacement of the subgrade is achieved.

Description

technical field [0001] The invention relates to the technical field of high-speed railway embankment disease control, in particular to a deviation correction method for ballastless track embankment of high-speed railways operated in soft soil areas. Background technique [0002] At present, my country's high-speed railway has basically formed a four-vertical and four-horizontal pattern. Among them, Beijing-Shanghai, Beijing-Hong Kong, Hangzhou-Fuzhou and other dedicated passenger lines pass through coastal areas where soft soil is widely distributed. Based on the advantages of long service life, good durability and small maintenance workload of ballastless track, ballastless track is widely used in high-speed railways in my country. After many years of theoretical and engineering case studies, Chinese engineers and technicians have a deep understanding of the subgrade settlement of ballastless track in soft soil areas. Usually, composite foundations, pipe piles + raft struc...

AI Technical Summary

Problems solved by technology

Due to the lack of research on the lateral deformation of the ballastless track subgrade, the understanding of the technical personnel on the lateral deformation of the subgrade is not deep enough

Engineering activities such as one-sided surcharge, foundation pit excavation, or post-maintenance asymmetric construction may cause the lateral deformation of the ballastless track subgrade in soft soil areas to exceed the limit, damage the smoothness of the track structure, and cause the train to overturn in severe cases

[0003] A large number of ballastless tracks used in my country usually use longitudinal connections, which have high longitudinal and lateral rigidity and cannot be repaired in a short period of time, and the use of traditional ballasted track push, pull, and track-shifting lateral deformation correction methods will cause great damage to the ballastless track structure and risk very high

The skylight time of the high-speed railway is short, and the operation or suspension of the high-speed railway is affected by the correction of the track structure, which not only causes economic losses, but also may have a huge negative social impact

The above factors greatly restrict the selection of the correction scheme, making it almost impossible to correct the track structure on the subgrade surface

At present, there is no method for rectifying the ballastless track subgrade of high-speed railways in soft soil areas that do not need to interrupt operations, do not damage the track structure, and have low risks.

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