Soft clay hollow cylinder sample preparation instrument and use method

Abstract

The invention discloses a soft clay hollow cylinder sample preparation instrument and a use method. The sample preparation instrument comprises a table type water drilling machine part, a replaceable drill bit part and a sample preparation barrel part; the table type water drilling machine part comprises a water drilling machine, a lifting bracket and a regulating handle; the lifting bracket is arranged at the lower part of the water drilling machine, a tool bit of the replaceable drill bit part is installed on the water drilling machine through an adapter; the sample preparation barrel part is fixed on the lifting bracket, a sample preparation barrel bracket of the sample preparation barrel part is fixed on a bottom turntable, a sample preparation barrel is arranged on the sample preparation barrel bracket, a spent clay barrel is arranged right below the sample preparation barrel, and a turntable motor is connected with the bottom turntable. According to the soft clay hollow cylinder sample preparation instrument and the use method, provided by the invention, the sample preparation instrument is simple in structure, convenient in operation and easy in demolding, and can realize mechanized sample preparation rapidly; the disturbance of the intact clay is reduced, the interior pile collapse of a hollow sample is prevented, the quality of a prepared sample is guaranteed effectively, and a foundation is laid for the torsional tear test of a hollow cylinder.

Description

technical field [0001] The invention relates to a sample preparation device for a hollow torsional shear test in an indoor geotechnical test, in particular to a sample preparation device for a soft clay hollow cylindrical sample and a method for using the same. Background technique [0002] With the development of social economy, infrastructure construction projects are blooming all over the country. Many high-speed railways and highways in China are built on soft foundations. Considering the dynamic loads such as waves and tides in coastal areas, the requirements for soil stability and deformation are increasing day by day. Therefore, it is particularly important to conduct laboratory mechanical tests on undisturbed soft clay under complex stress conditions. [0003] The hollow torsional shear instrument can study the anisotropic mechanical properties of the soil under complex stress paths, and realize the simulation of the actual soil principal stress direction by indepen...

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Problems solved by technology

[0007] The purpose of the present invention is to address the above technical problems, to provide a soft clay hollow cylindrical sample sample preparation instrument and its use method, which are used to overcome the problems of large disturbance, large error of inner and outer diameters, slow sample forming speed and other problems in the sample preparation process. Improving the sample preparation quality of soft clay hollow cylinder samples and laying the foundation for hollow cylinder torsional shear tests

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