Temperature-controlled repeated-shearing unsaturated soil direct shear apparatus

Abstract

The invention discloses a temperature-controlled repeated-shearing unsaturated soil direct shear apparatus. A support system is composed of a base, an upright and a flat plate, a shearing box supportis welded on the base, a shearing box is arranged on the shearing box support, a high-air-incoming-value clay plate is bonded at the bottom of the inner side of the shearing box, and pore water pressure can be measured on the lower portion of the clay plate. An environment chamber is arranged on the outer side of an air pressure chamber, a refrigerator is mounted on a side plate of the environmentchamber, a heating rod is arranged on the shearing box base in the environment chamber, and constant temperature control of an experiment is realized by means of electronic refrigerating and heating.A first connection member is welded on the right side of a lower shearing box and fixedly connected with the left end of a pushing shaft, and a second connection member is welded on the left side ofan upper shearing box and fixedly connected with a limiting connection member at the right end of a force transmission rod. Repeated shearing of an unsaturated soil sample is realized through forward-backward rotation of the motor, and shearing displacement can be set in a repeated shearing control portion. By the apparatus, researches on impact of temperature and shearing displacement on residualstrength of unsaturated soil can be conducted.

Description

technical field [0001] The invention relates to the technical field of geotechnical engineering testing, in particular to a temperature-controlled repeated shear unsaturated soil direct shear instrument, which can be used to study the influence of temperature on the unsaturated soil shear strength and residual strength index. Background technique [0002] Landslide is a common geological disaster, which occurs frequently and has serious impact. my country is a mountainous country with frequent landslides, causing huge losses to industrial and agricultural production and people's lives, and some even devastating disasters. [0003] Among them, the slide zone soil is an important part of the landslide. Due to the particularity of the force and the complex geological effects in the formation process, its fabric characteristics and physical and mechanical properties are quite different from those of other parts of the landslide mass. , and its intensity index is the key content...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a temperature-controlled repeated shearing unsaturated soil direct shear instrument, which solves the problem that the current conventional unsaturated soil direct shear instrument cannot realize the repeated shearing of the sample, and can only be limited to the determination of unsaturated soil at normal temperature. Disadvantages of Soil Shear Strength

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