Sample preparation device and sample preparation method for preparing sample for geotechnical true triaxial test

Abstract

The present invention relates to a sample preparation device and a sample preparation method for preparing a sample for a geotechnical true triaxial test, the sample preparation device comprises a bearing platform, a consolidation device and a loading device for applying a downward pressure to the top of the consolidation device in a vertical direction, the consolidation device comprises a drainage base, at least two screws, a sample preparation frame, an auxiliary frame, a latex film, a lower permeable plate, first filter paper, an upper permeable plate, second filter paper and a pressure plate, an exhaust pipe is arranged on the side wall of the sample preparation frame, a first drainage pipe is arranged on the drainage base, and a second drainage pipe is arranged on the pressure plate; and the cross sections of the fixing groove, the inner cavity of the sample preparation frame and the inner cavity of the auxiliary frame are regular polygons or rectangles. A cubic remolded sample is prepared by using a slurry consolidation method, and the drainage volume is controlled through top pressure and the valve so that the density and the water content of the remolded sample are controlled; the whole sample preparation process is simple and easy to implement, and the sample preparation device is scientific, simple, convenient, high in operability and high in economic practicability.

Description

technical field [0001] The invention relates to the field of construction, in particular to a sample preparation device and a sample preparation method for preparing samples for geotechnical true triaxial tests. Background technique [0002] The mechanical and deformation properties of soil are an important theoretical basis to guide the design and construction of geotechnical engineering. Most of the existing soil strength and stress-strain relationships are obtained through conventional triaxial tests. However, conventional triaxial tests can only consider axisymmetric stress states. The properties of the soil under the model failed to consider the influence of the intermediate principal stress. The stress state of soil in actual engineering is complex and is a typical three-dimensional problem. The true triaxial instrument can overcome the limitations of the conventional triaxial instrument, and can reasonably simulate the real stress state and the deformation and streng...

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Problems solved by technology

At present, most of the existing slurry consolidation method sample preparation devices are for cylindrical samples, and there are few devices for preparing true triaxial samples and there are many problems: After the soil is made into a cubic soil sample, the soil needs to be demoulded and installed. The latex film is easy to cause damage to the soil sample; if the latex film is directly placed in the sample preparation cylinder, as the consolidation pressure increases, the latex film is easy to move and deform, making the prepared soil sample uneven; The initial conditions such as sample dry density are difficult to control; after the sample preparation is completed, secondary cutting and moving are required, and the soil sample is greatly disturbed

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