Method and device for on-site observation of frost heaving of high-speed railway soil layer in seasonally frozen soil area

Abstract

The invention relates to a method and a device for on-site observation of frost heaving of high-speed railway soil layers in seasonal frozen soil regions. The frost heave of the permafrost layers in seasons observed by optical instruments cannot be observed for the frost heave of each layered soil within the freezing depth, and the accuracy is difficult to meet, which requires professional instruments and observation technicians to observe. The device of the present invention is embedded in the seasonal frozen soil layer, and comprises a circular sheet-shaped lower anchor plate and an upper anchor plate, and the center of the lower anchor plate and the upper anchor plate is connected with an upright measuring rod displacement meter, and the measuring rod The displacement meter is connected with the reading instrument installed outside the filling above the upper anchor plate through the transmission cable; the frost heaving deformation of the seasonally frozen soil layer drives the movement of the upper and lower anchor plates, and the distance between the upper and lower anchor plates is observed by the measuring rod displacement meter. The amount of change reflects the amount of frost heave in the seasonal frozen soil layer. The invention can not only observe the total amount of frost heave of the seasonal frozen soil layer, but also observe the amount of frost heave of each layered soil by setting devices with different lengths, the displacement meter has high observation accuracy and high observation efficiency, and can realize the observation of frost heave deformation automation.

Description

technical field [0001] The invention belongs to the technical field of road construction in seasonal frozen soil regions, and in particular relates to a method and a device for on-site observation of frost heaving of high-speed railway soil layers in seasonal frozen soil regions. Background technique [0002] The soil (rock) whose surface is frozen in winter and melts in summer is called seasonally frozen soil. my country's seasonally frozen soil is mainly distributed in the provinces north of the Yangtze River, accounting for about 53% of the country's land area, and the greenhouse effect of the climate makes the area of ​​seasonally frozen soil in cold regions increasing year by year. About 35% of the roads and railways in the world are located in the seasonally frozen areas, and the traffic lines located in the seasonally frozen areas in my country account for about 30% of the total roads. [0003] Highway experience in cold regions shows that frost heave has a serious ...

AI Technical Summary

Problems solved by technology

[0006] 1. The amount of frost heave observed by optical instruments is the total amount of frost heave, and the amount of frost heave of each layered soil within the freezing depth cannot be observed, and the proportion of the frost heave of each layered soil to the total frost heave cannot be analyzed;

[0007] 2. For high-speed railways, non-frost heave and weak frost heaving soil are used for filling in the frozen layer. Sometimes the amount of frost heave is very small and the value is at the millimeter level. The observation accuracy of optical instruments is difficult to meet the requirements, and it is impossible to analyze the soil Provide accurate data for body frost heave;

[0008] 3. The use of optical instruments to observe the amount of frost heave requires special instruments and professional observation technicians to observe. The requirements for the professional quality of the instruments and observers are high, the observation efficiency is low, and the observation cannot be automated

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