A device for preparing geotechnical triaxial sand samples

Abstract

The invention belongs to the field of civil engineering and relates to a preparation device of a geotechnical three-axis sand sample. The preparation device comprises a funnel, a sand falling switch, an upper organic glass pipe, a dispersion device, a dispersion sheet, a lower organic glass pipe, a splitting mold and a three-axis chamber base, wherein the lower organic glass pipe is arranged on the three-axis chamber base through the splitting mold; the splitting mold is provided with a lower air exhausting hole; the dispersion device comprises an upper dispersion device and a lower dispersion device, each having a convex-shaped section; the upper dispersion device sleeves the outer part of the upper organic glass pipe and the lower dispersion device sleeves the outer part of the lower organic glass pipe; the dispersion sheet is embedded between the upper dispersion device and the lower dispersion device; the upper dispersion device and the lower dispersion device are arranged back to back and are connected through a connection bolt; the upper organic glass pipe is communicated with the lower organic glass pipe through the dispersion sheet in the dispersion device; the funnel is arranged at the top of the upper organic glass pipe and is communicated with the upper organic glass pipe through the sand falling switch; and the upper organic glass pipe is provided with an upper air exhausting hole. The preparation device of the geotechnical three-axis sand sample has the advantages that the sand sample with good uniformity can be prepared and the operation is convenient.

Description

technical field [0001] The invention belongs to the field of civil engineering, and relates to a device for preparing a geotechnical triaxial sand sample, in particular to a device for preparing a sand sample by a vacuum shakeout method. Background technique [0002] Because sand is easily disturbed, it is difficult to obtain undisturbed sand samples in indoor geotechnical tests. Therefore, the artificial simulation preparation of cohesion-free soil samples in geotechnical tests is particularly important. At present, the commonly used methods include: air shakeout method, water shakeout method, dry loading method and wet loading method. In the falling sand method, due to the resistance and buoyancy of the particles during the falling process, usually, the large particles will fall first, and the small particles will fall slowly. For sand samples with a large content of fine particles, the fine particles are scattered randomly, and the prepared sand samples are very uneven, ...

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the need for the preparation of uniform triaxial sand samples that cannot be met by existing sand shakeout devices, and further provide a preparation device for geotechnical triaxial sand samples that can produce sand samples with good uniformity and is easy to operate

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