Direct shear sample device and method of use for dry-wet cycle test

Abstract

The invention discloses a direct shear test sample device of a wetting-drying test and an application method thereof. The device comprises a water channel arranged on a test table, wherein a permeablematerial panel is arranged in the bottom of the water channel; a test sample lower box is embedded into the permeable material panel; a test sample upper box is arranged correspondingly on the test sample lower box and is fixed through a dowel; a force measuring ring is arranged between the test sample upper box and the test table which communicate through a connecting rod; a direct shear transmission device is arranged on the test table and is connected to the water channel through a force transfer rod; an air pressure loading device is externally connected to the upper side of the test sample upper box and is fixed to the test table through a counterforce rack ad a horizontal fixed pulley A; a simulative heating and drying device is arranged above the air pressure loading device and isfixed to the test table through a column. The device simulates the drying and wetting cycle process of soil in a loaded condition through a drying and wetting cycle system. After the drying and wetting cycle, a direct shear test can be performed directly without detaching the test sample, so that disturbance to the soil sample caused by sample detachment (loading and unloading) is avoided effectively.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering test instruments and equipment, and relates to a geotechnical engineering test device, in particular to a direct shear sample device for a dry-wet cycle test and a use method thereof. Background technique [0002] In the southern part of my country, there will be large-scale rainfall every Meiyu season, and the water evaporates rapidly after the rain in the Meiyu season. Rainfall and rapid evaporation of water often alternate, resulting in repeated changes in soil moisture content. The alternating action of dryness and wetness reduces the strength of the soil, leading to natural disasters such as landslides, and causing huge economic losses and casualties in southern my country. Therefore, it is necessary to study the change law of mechanical properties of soil under the condition of dry-wet cycle, so as to provide a theoretical basis for the prevention and control of landslides ...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved: In order to overcome the deficiencies of the existing technology, solve the dry-wet cycle of the soil under load conditions, and realize the test device for direct shearing of the dry-wet cycle sample without disassembling the sample, this The invention provides a direct shear sample device for dry-wet cycle test and its use method

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