System for kinetic model test of ballastless track subgrade of high-speed railway

Abstract

The invention discloses a system for kinetic model test of the ballastless track subgrade of a high-speed railway. The system comprises a model test box, a model of the ballastless track subgrade of the high-speed railway, an excitation system and a monitoring system, wherein the model of the ballastless track subgrade of the high-speed railway is formed by the foundation, a foundation bed bottom layer, a foundation bed surface layer, a concrete base, CA (cement asphalt) mortar, a track plate, a fastener system and a steel rail in sequence; the excitation system comprises a series of vibration exciters; simulation of train loads at different running speeds is realized by cooperatively controlling the vibration excitation frequency and phase of each vibration exciter; and dynamic earth pressure sensors and layered settlement gauges are arranged in the model of the subgrade, steel strain gauges are embedded in the concrete base and displacement and acceleration sensors are arranged on the track structure to jointly form the monitoring system of the system. The system can be used for carrying out study on the kinetic model test of the subgrade under the running load of the train and can evaluate and predict different foundation conditions, subgrade structures and track irregularity.

Description

technical field [0001] The invention relates to a roadbed dynamics model test system, in particular to a high-speed railway ballastless track roadbed dynamics model test system. Background technique [0002] At present, my country generally adopts ballastless track technology on 300km / h and above passenger dedicated railways. Since the loose ballast of the ballastless track has been replaced by the reinforced concrete material with great rigidity, the structure of the ballastless track is extremely sensitive to the deformation and stiffness of the roadbed. The high-speed operation of the train puts forward high requirements on the dynamic performance of the track structure and subgrade soil. The increase of the train speed leads to the aggravation of the vibration of the track structure, especially when the train speed is close to the critical wave velocity of the soil, the dynamic response of the soil increases sharply. The increase of the train speed leads to a larger in...

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Problems solved by technology

Another example is the ballastless track test section of the Eastern Suburb Ring Road in Beijing, where real vehicles are used for on-site simulation tests, which can realize dynamic tests at different train speeds. Reproducibility cannot be achieved

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