Unsaturated soil direct shear test device with adjustable shear ring diameter

Abstract

The invention discloses a shear ring diameter adjustable unsaturated-soil direct shear instrument testing device which comprises an upper shear box and a lower shear body. Each of the upper and lower shear boxes comprises a circular telescopic steel sheet, steel sheet abutted plates and an outer shear shell; the outer shear shell is of a equilateral triangle, the middle portion of each edge of the triangle is connected with one steel sheet abutted plate, the steel sheet abutted plates have the circular telescopic steel sheet fixed respectively in three directions, and the upper and lower shear boxes are fixedly connected through bolts. By the arrangement, the problem that soil desiccation cannot be attached to the inner wall of the shear box can be solved, precision in unsaturated-soil strength test is improved, and the testing device is easy and light in design, convenient in operation, good in integrated performance and wide in application.

Description

technical field [0001] The invention relates to an unsaturated soil direct shear instrument test device capable of adjusting the diameter of a shear ring, belonging to the field of geotechnical engineering measuring instrument manufacturing technology and testing. Background technique [0002] The water velocity in unsaturated soil is very slow. In order to make the soil sample deform and pore pressure uniform, the loading rate in the shear test is much smaller than that in saturated soil, and the test duration is much longer. Compared with the triaxial test, the unsaturated soil direct shear instrument has a simple structure and is easy to operate, especially the thickness of the sample is small, and the test duration is greatly shortened, so the test efficiency can be improved. [0003] During the change of suction, the volume of the soil will change greatly, such as bentonite, red clay and other clay soils with special properties. Taking bentonite as a class, bentonite h...

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Problems solved by technology

[0006] The purpose of the present invention is to address the deficiencies in the prior art, to provide an unsaturated soil direct shear instrument test device with an adjustable shear ring diameter, which can measure the diameter of the soil under real-time conditions, and obtain the soil in different states. The volume change under the pressure solves the problem that the soil shrinks and the inner wall of the shear box cannot fit together, and obtains the direct shear strength of the soil under different suction

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