Large frost heaving test system for coarse-grained soil

Abstract

The invention relates to a large-scale frost heaving test system for coarse-grained soil, and aims to solve the problems that most of researches on frost heaving test devices are concentrated on fine-grained soil at present, and frost heaving researches on the coarse-grained soil are few. The large frost heaving test system for the coarse-grained soil comprises a base constant-temperature water replenishing system, a temperature monitoring system, a top freezing system and a frost heaving deformation monitoring system, according to the freezing mode, through a freezing refrigeration top plate (9), a hollow core test cylinder (5), a bottom constant temperature device (4), a first water bath refrigerator (15), a second water bath refrigerator (20) and a bottom water system, a more accurate one-way freezing test under the water supplementing condition is achieved; on the aspect of frost heaving deformation monitoring, the frost heaving deformation amount of soil is accurately and automatically monitored through a digital display dial indicator (16), and the automation and accuracy of the test are improved; the device is applied to the field of coarse-grained soil frost heaving tests, and provides certain support for the frost heaving problem in projects such as roads, buildings and water conservancy.

Description

technical field [0001] The invention relates to a large-scale frost heave test system for coarse-grained soil. Background technique [0002] my country's permafrost is widely distributed, accounting for about 70% of the country's land area. According to the length of freezing time, it can be divided into instantaneous frozen soil, seasonal frozen soil and permafrost. Frozen soil refers to the soil in which the water in the soil freezes into ice at negative temperatures, and the volume of the soil expands, resulting in frost heave. The issue of frost heave involves road engineering, tunnel engineering, bridge engineering, construction engineering, water conservancy engineering, etc. In the cold region, roadbed diseases and damages to buildings (structures) such as bridges and tunnels caused by frost heaving problems have become common occurrences, causing immeasurable economic losses and traffic safety accidents. Therefore, the research on the problem of frost heave in perm...

AI Technical Summary

Problems solved by technology

The cylinder wall has a heating function, so that there is a temperature difference between the soil layer near the cylinder wall and the soil layer in the center of the cylinder. When the top plate is frozen, the soil center and the soil close to the cylinder wall cannot be frozen simultaneously. Due to the heating function of the cylinder wall, the soil layer on the cylinder wall maintains a high temperature and is difficult to freeze

Therefore, resulting in non-uniform freezing, resulting in inaccurate frost heave deformation

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