High-suction-controlled roadbed material wetting-drying cycle testing device and testing method thereof

Abstract

The invention provides a high-suction-controlled roadbed material wetting-drying cycle testing device and a testing method thereof. The high-suction-controlled roadbed material wetting-drying cycle testing device comprises a test cavity, wherein the test cavity comprises a soil body test sample, a substrate, an upper cap and an outer wall; the test cavity is connected with a gas circulation pump, a saturated saline solution accommodating bottle and a mixed gas buffer container to form a sealed gas loop; permeable stone is arranged at the top and the bottom of the test sample. The device further comprises a humidometer, a throttle valve, a flowmeter and a soil moisture sensor. By means of a gas phase equilibrium method, the device disclosed by the invention achieves the purpose of performing the high-suction-controlled wetting-drying cycle testing method on the test sample, has convenience in operation, can accurately control water content and can more accurately control roadbed material wetting-drying cycle sample conditions.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering, and in particular relates to a dry-wet cycle test device and a test method for roadbed materials controlled by high suction. Background technique [0002] During the use of the road subgrade, it is not only subjected to the repeated action of vehicle loads, but also the comprehensive action of external environmental factors, and its internal moisture content has seasonal repeated changes. Studies have shown that under the action of dry-wet cycles, the internal structure of roadbed filling materials will undergo irreversible changes, resulting in a decrease in strength and stiffness, and even instability of the roadbed. [0003] In order to study the change law of the physical and mechanical properties of roadbed materials under the action of dry-wet cycle conditions, at present, domestic and foreign scholars mainly conduct research through indoor dry-wet cycle tests, while the tr...

AI Technical Summary

Problems solved by technology

At present, there is only a dry-wet cycle test device that uses the axial translation technology to control the suction. However, because the axial translation technology is affected by the air intake value of high-intake ceramics, it can only control the suction within the MPa level, so its application is limited.

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