Coarse-grained soil triaxial test sample preparation instrument and using method thereof

Abstract

The invention discloses a sample preparation device for a coarse-grained soil triaxial test, and belongs to the technical field of soil body testing apparatus. The sample preparation device comprises a pressure chamber pedestal, an outer pressure chamber cylinder, a rubber membrane, porous stone, an inner pressure chamber cylinder, an isolating cloth cover, a funnel, a cylindrical compaction device and an annular compaction device, wherein the porous stone is arranged inside a groove in the pressure chamber pedestal; the lower end of the outer pressure chamber cylinder is fixed on the pressure chamber pedestal; the rubber membrane tightly covers the inner surface of the outer pressure chamber cylinder; the inner pressure chamber cylinder for containing coarse aggregates is arranged inside the outer pressure chamber cylinder; the isolating cloth cover tightly covers the outer surface of the inner pressure chamber cylinder. The invention further discloses an application method of the device. The sample preparation device disclosed by the invention cannot cause deformation of the coarse aggregates; meanwhile, the rubber membrane is protected by a sand layer to avoid breakage; the specimen can be prevented from oversize disturbance due to the cylinder lifting process in the pressure chamber; the sample preparation device is quick in specimen filling speed and high in efficiency, and can effectively ensure normal operation of the test.

Description

technical field [0001] The invention belongs to the technical field of soil test devices, and in particular relates to a coarse-grained soil triaxial test sample preparation instrument and a use method thereof. Background technique [0002] Coarse-grained soil has excellent engineering characteristics such as good compaction, high strength, strong water permeability, high filling density, high shear strength, small subsidence deformation, high bearing capacity, and is not easy to liquefy under earthquake loads. It is widely used in engineering, such as earth-rock dams, roads, ports and other projects. Therefore, it is very important to study the mechanical properties of coarse-grained soil. Shear strength is one of the main engineering characteristic indicators of soil and stone materials, and it is the basis for stability analysis of earth and stone works such as natural soil and rock bodies, artificially filled embankments, earth-rock dams, roadbeds, etc. Therefore, the a...

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Problems solved by technology

[0004] Purpose of the invention: the purpose of the present invention is to provide a coarse-grained soil triaxial test sample preparation instrument to solve the problem that the rubber film is easily damaged and the sand layer is lost during the saturation process during the coarse-grained soil triaxial test, and to make the sample preparation process fast Effective, reducing the impact on the original properties of the sample

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