Method and device for field observation of soil layer frost heaving of high speed railway in seasonal frozen soil region

Abstract

The invention relates to a method and device for field observation of soil layer frost heaving of a high speed railway in a seasonal frozen soil region. An optical instrument used for observing seasonal frozen soil layer frost heaving amount cannot be used for observing the frost heaving amount of all layered soil in the freezing depth, precision is hard to meet, and professional instruments and observation technicians are needed for observation. The device is buried in a seasonal frozen soil layer and comprises a round-sheet-shaped lower anchor disc and a round-sheet-shaped upper anchor disc. A vertical measuring bar displacement meter is connected to the center of the lower anchor disc and the center of the upper anchor disc, and the measuring bar displacement meter is connected with a reading instrument arranged outside filled soil above the upper anchor disc through a transmission cable. Frost heaving deformation of the seasonal frozen soil layer drives the upper anchor disc and the lower anchor disc to move, and the measuring bar displacement meter is used for observing the variable quantity of the distance between the upper anchor disc and the lower anchor disc to reflect the frost heaving amount of the seasonal frozen soil layer. By means of the method and device, the total frost heaving amount of the seasonal frozen soil layer can be observed, and the frost heaving amount of all layered soil can be observed by setting devices of different lengths; the displacement meter is high in observation precision and efficiency, and automation of observation of frost heaving deformation can be achieved.

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 ...

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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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