Railway subgrade mud-pumping phenomenon simulating testing device and method

Abstract

The invention discloses a railway subgrade mud-pumping phenomenon simulating testing device and method. The railway subgrade mud-pumping phenomenon simulating testing device comprises an axial loadingframe, a counterforce frame, a water circulation model box and a lifting-type elastic base; the axial loading frame comprises a loading frame top plate, a loading frame bottom plate, a supporting upright column, a vibrating device and a loading mechanism; the counterforce frame comprises a pressing plate and a pressurized column connected between the pressing plate and the loading frame bottom plate; the pressurized column penetrates through the loading frame top plate; the lifting-type elastic base is mounted on the upper surface of the loading frame bottom plate, and the water circulation model box is mounted between the loading mechanism and the lifting-type elastic base; the water circulation model box comprises a model box body, a water storage cavity and a soil sample storage cavity, and the water storage cavity and the soil sample storage cavity are partitioned by a water permeable plate; and the bottom of the loading mechanism is provided with a loading plate which extends into the soil sample storage cavity and is capable of vertically moving. By using the railway subgrade mud-pumping phenomenon simulating testing device, model tests simulating various combination ways ofa dynamic load, a water condition and physical properties of a soil body can be simultaneously performed.

Description

technical field [0001] The invention relates to a test device and a test method for simulating the phenomenon of mud-flowing disease of a railway subgrade. Background technique [0002] The subgrade is an important part of the railway line, and its function is to bear the dynamic load of the train and the load of the superstructure. Slurry and oozing of subgrade bed is a new type of disease of railway track, which has an important impact on the safety and comfort of line operation. Occurrence of the phenomenon of slurry and mud discharge may not only cause uneven subsidence of the subgrade, affect the normal operation of the train, increase the maintenance cost of the line, but may also pose a great safety hazard to the operation of the train in severe cases. [0003] At present, scholars at home and abroad generally believe that the physical and mechanical properties of the subgrade filling granular materials are the internal cause of the phenomenon of slugging, the dynami...

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Problems solved by technology

The ground anchor on the concrete of this patent, the reaction force is completed by stacking, and the volume is very large

Moreover, the larger the scale of the model test in civil engineering, the more uncontrollable factors, such as some boundary conditions, the uniformity of the sample and other factors, are difficult to control consistently

At the same time, this kind of test device is basically disposable, does not have good test repeatability, and it is labor-intensive and time-consuming to carry out a test

[0005] In addition, CN106771076A and CN206399943U are replenished with the help of a simulated precipitation device. In fact, the source of water for the phenomenon of mud and mud on the railway subgrade is not clear at present. The relevant railway departments have also found in long-term field statistical observations that even if there is no precipitation for a long time in some areas At this time, the volumetric moisture content of the soil layer in the railway subgrade is very low, but under the action of frequent railway dynamic loads, there will still be local subgrade muddying. Therefore, it must not be simply considered that precipitation causes water-rich upper part of the subgrade And the disease problem that forms must wait for further research

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