Soil frost heave force measurement device and measurement method

Abstract

The invention discloses a soil frost heave force measurement device, which comprises a measurement tank and a measurement element. The measurement tank is divided into three areas, i.e. a water tank,a soil carrying tank and a measurement area from bottom to top through a permeable carrying plate and a top plate; a water inlet pipe is arranged on an outer wall of one side of the water tank; a water outlet pipe is arranged on an outer wall of the other side of the water tank; the soil carrying tank is used for placing a tested soil sample; a plurality of permeable holes are formed in the permeable carrying plate on the lower part, and a piece of thin filter paper covers; water in the water tank is immersed into the soil sample in the soil carrying tank through the permeable holes; two reinforcing steel bars are symmetrically arranged in the measurement area; the bottom parts of the reinforcing steel bars are fixedly connected with a top plate; the top parts of the reinforcing steel barspress against on a tank cover; the tank cover seals on the measurement tank; slideways for the top plate to slide up and down are arranged on two opposite side walls of an area on which the soil carrying tank and the measurement area are located; the measurement element comprises two reinforcing steel bar stress detectors arranged on the corresponding reinforcing steel bars. The measurement device provided by the invention is simple in structure, convenient to operate and capable of accurately measuring a soil frost heave force.

Description

technical field [0001] The invention belongs to the field of soil engineering tests, and in particular relates to a soil frost-heave force measuring device and a measuring method. Background technique [0002] In permafrost areas, frost damage has always been the main problem in railway and road subgrades, and it is also a controlling factor affecting various technical indicators and driving stability of railways and roads in permafrost areas. Frost heaving occurs when the soil contains water. The reason for soil heaving is that the volume of the soil expands due to the freezing of water into ice. At the same time, during the freezing process of the soil, the moisture in the non-frozen area migrates to the frozen area, which significantly increases the water content of the frozen soil layer. When the subgrade soil begins to heave, due to the effect of negative temperature, water begins to accumulate from the lower layer to the frozen cover, forming ice crystals and ice inte...

AI Technical Summary

Problems solved by technology

Due to the frost heaving and thawing phenomenon of the soil, it is easy to produce uneven frost heaving, which will lead to uneven roadbed and seriously affect driving safety.

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