Unsaturated roadbed soil freeze-thaw cycle model test system

Abstract

The invention discloses an unsaturated roadbed soil freeze-thaw cycle model test system, relates to a freeze-thaw cycle test device, and aims to solve the problem that an existing freeze-thaw cycle test device cannot truly and accurately reflect the comprehensive influence of temperature, moisture and load in the actual freeze-thaw cycle process, wherein the device comprises a test bin, a controlsystem and a data acquisition system, and the test bin comprises a sleeve, a heat preservation body and a water permeable part; a test piece is loaded in the sleeve, the side wall is hermetically wrapped with a thermal insulator, and the water permeable part is arranged at the bottom; the control system comprises a temperature control system, a moisture control system and a load control system; the temperature control system comprises a temperature control chamber, an upper temperature control disc and a lower temperature control disc; the temperature control chamber covers the test bin; the upper temperature control disc and the lower temperature control disc are respectively arranged at the top and the bottom of the sleeve; the moisture control system is communicated with the bottom of the test piece through a water supplementing pipe; the load control system is arranged at the top of the sleeve; the data acquisition system comprises a temperature acquisition system, a moisture acquisition system and a displacement acquisition system.

Description

technical field [0001] The invention relates to a freeze-thaw cycle test device, in particular to a freeze-thaw cycle test device for measuring water, heat and force parameters of unsaturated soil. Background technique [0002] my country's seasonal frozen soil areas are widely distributed, covering an area of ​​5.137 million km2, accounting for 53.5% of the total area of ​​the country, covering more than 10 provinces and cities in the central and northern parts of my country. Periodic freezing and thawing are the main factors that cause water migration in subgrade soil. Moisture migration will change the unsaturated state of subgrade soil, reduce the strength and stability of the soil, and even cause frost heaving, which seriously affects the performance of subgrade engineering. It is a hot engineering issue that scholars at home and abroad pay attention to. The water in the subgrade soil flows from the position of high soil potential energy to the position of low soil pot...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the problem that the existing freeze-thaw cycle test device cannot truly and accurately reflect the comprehensive influence of temperature, moisture and load in the actual freeze-thaw cycle process, and to provide a freeze-thaw cycle model test for unsaturated subgrade soil system

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