Testing machine for mechanical parameter of roadbed material in freezing and thawing cycle

Abstract

A testing machine for testing the mechanical parameters of subgrade materials under the freezing and thawing cycle comprises a temperature controlled system, a dynamic load system, a mechanical parameter testing system, a data acquisition system and an electronic control system; the temperature controlled system is used for simulating the freezing and thawing cycle of subgrade soil in the real environment; the electronic control system is used for controlling the dynamic load system during the freezing or thawing process, thereby enabling the dynamic load system to output various frequencies to simulate the traffic load; the mechanical parameter testing system is used for measuring the total settlement and strain; the deflection and strain value is collected by the data acquisition system in a real-time manner; and after processing, the numerical values, the time-displacement curve and the strain-time curve are displayed. The invention tests the mechanical characteristic parameters of the subgrade materials and monitors the frost-heave capacity, the pavement deflection value and the deformation of the materials during the process of the dynamic load freezing or thawing, quickly and stably simulates the environment necessary for testing, and measures the mechanical performance index of the materials, thereby providing design parameters for road engineering in a seasonal frost region, ensuring that a road in the seasonal frost region fulfills the service life as designed, and improving the measuring accuracy with accurate calculation result.

Description

technical field [0001] The invention relates to a testing machine for testing mechanical parameters of roadbed materials under freeze-thaw cycles. Background technique [0002] Research and practice in recent years have shown that in areas with seasonally frozen soil, when the road route needs to pass through areas with active groundwater and areas with poor hydrogeological conditions, frost heaving and muddying of the road are caused by frost damage, which reduces the service life of the road by 50% %, and increased maintenance costs, a waste of manpower, material and financial resources. my country's seasonal frozen soil is widely distributed, covering more than 10 provinces and cities north of the Yangtze River, accounting for 53.5% of the total area of ​​the country, and its freezing damage has caused great losses to the national economy. The freeze-thaw resistance of subgrade materials is in the research stage at home and abroad, and it is an urgent problem to be solve...

AI Technical Summary

Problems solved by technology

[0003] Existing instruments and equipment such as triaxial instruments cannot test the mechanical indicators of roadbed materials during the freeze-thaw process, and can only be tested after freeze-thaw

Another kind of freeze-thaw cycle testing machine is only to test the stability and durability of the material after freeze-thaw cycle, and cannot measure the change of the mechanical index of the material.

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