Sample preparation device for ring shearing experiment of soil body under water-chemistry condition

Abstract

The invention relates to a sample preparation device for a ring shearing experiment of a soil body under the water-chemistry condition. The sample preparation device mainly comprises an upper bearing plate, a lower bearing plate, an upper inner ring, a lower inner ring, an upper outer ring, a lower outer ring, an upper rigid bearing column, a lower rigid bearing column, a fastening sleeve, an upper water-permeable cover plate, a lower water-permeable cover plate and a ring sample containing groove. By design of the upper outer ring, the separable lower outer ring, the inner rings and the rigid bearing columns which are separable, the sample preparation device meets the accurate control for the sample specification in the ring shearing experiment, not only is used for preparing a ring shearing sample of the soil body, but also can be used for preparing a ring-shearing sample for contact between soil and concrete. According to the sample preparation device, the outer rings, the inner rings and the water-permeable cover plates are all made of toughened glass material. The device is applicable to consideration about the influence of the corrosion condition of the water-chemistry solution on sample preparation equipment, and the phenomenon that the soil body sample gets expanded and loose after being soaked for a long time is effectively overcome. The sample preparation device is reasonable in structure, convenient in disassembly and high in reliability and can be widely applied to the ring shearing experiment for mechanical parameter testing of the soil body and the contact surface between the soil and the concrete in the rock-soil slope engineering.

Description

technical field [0001] The invention relates to a sample preparation device for soil ring shear experiments under hydrochemical conditions, and the device can be widely used in ring shear experiments for soil and soil-concrete contact surface mechanical parameter testing in geotechnical slope engineering sample preparation. Background technique [0002] Rock and soil slopes formed by natural and artificial excavation are widely distributed in river banks, water conservancy, hydropower and transportation projects, and most of them are inevitably affected by multiple factors such as water level changes, rainfall and human domestic sewage, making Slope rocks and soils are usually under hydrochemical environmental conditions, which are prone to local or large-scale deformation and failure, which will lead to landslide geological disasters, endangering engineering construction operations and the safety of human life and property. [0003] With the continuous change of the hydroc...

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Problems solved by technology

[0004] Although the equipment technology of the ring shear instrument is relatively mature, there is usually no matching sample preparation mold, and the experimenter needs to design and manufacture it according to the experimental requirements.

However, in order to facilitate the disassembly of the pressure plate and the inner and outer ring structures of the existing molds, the joints of the molds are often not tight enough, so that the soil is easily squeezed out of the gaps during the sample preparation process. In turn, it greatly affects the accuracy and reliability of the test results.

Secondly, the inner and outer rings of the existing mold are integral and single rigid annular structures. When considering the contact conditions between soil and concrete, it is difficult to control the horizontal precision of the concrete at the bottom of the annular groove for loading samples, so the ring shear test of soil and concrete contact cannot be realized. Prototyping

Thirdly, in order to ensure the rigidity of the mold during sample preparation, the existing molds are all made of steel materials, and the objective conditions of the slope soil in the hydrochemical environment are not considered, resulting in the mold not being equipped when preparing samples that require chemical solution immersion. Corrosion resistance, and the mold cover plate lacks sufficient water-permeable design, therefore, it cannot be applied to the preparation of soil samples affected by different acids and alkalis and different ions under water chemical conditions

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