Sample cutter for preparing undisturbed loess sample for triaxial test

Abstract

The invention discloses a sample cutter for preparing an undisturbed loess sample for a triaxial test. The sample cutter comprises a bracket on which a base plate is arranged; a synchronous motor is arranged below the base plate; a loess downward cutting disk is arranged on the base plate; the loess downward cutting disk is driven by the synchronous motor to rotate; a supporting stand column is distributed on the base plate; a top plate is arranged on the supporting stand column; a connecting shaft is arranged on the top plate; the connecting shaft is provided with a loess upward cutting disk corresponding to the loess downward cutting disk; a telescopic push rod is arranged on the top plate; a direct-current motor is arranged above the telescopic push rod; a loess cutter frame and a linear motor are arranged below the telescopic push rod; a loess cutter is arranged on the loess cutter frame; and the linear motor drives the loess cutter frame to do reciprocating motion on a guide rail. The sample cutter is convenient to use and can precisely control the size of a sample during sample preparation; moreover, the automation degree is high and the sample preparation efficiency can be improved.

Description

technical field [0001] The invention relates to a device, in particular to a sample cutting instrument for preparing undisturbed loess samples for triaxial tests. Background technique [0002] At present, when carrying out the triaxial test of soil, it is generally necessary to carry out necessary processing and preparation of the soil sample according to the requirements of the test regulations. For the disturbed soil, the prepared soil sample is generally compacted in layers according to the predetermined dry density by using the sampling device matched with the instrument, and then directly installed on the test base for the test. For the preparation of undisturbed soil samples, the soil samples are generally cut into shape by a soil cutting device matched with the test instrument. At present, except for some differences in the structure of the soil cutting disks produced by various instrument manufacturers, the parts used to place and fix the soil samples are basically ...

AI Technical Summary

Problems solved by technology

Due to the large difference in softness and hardness of the soil samples, there are the following problems in the sample preparation process: (1) When the moisture content of the loess is small, the loess is in a hard or hard plastic state, and it is difficult to cut the soil with a small force If the force is too large, it is easy to cause the soil sample to break (or partially fall off); when the water content of the loess is high, the loess is in a plastic state, and the strength is greatly reduced. When cutting the soil, if the force is not uniform, it is easy to cause the soil sample Twist or local excessive cutting

(2) With manual cutting, it is not easy to control the size of the soil sample, and it is easy to have problems such as inconsistent diameters of the top and bottom of the soil sample, and the soil sample is not round.

In addition, the loess structure is loose, and the axial torsion that the soil sample can bear is very small. If a cutting method similar to a lathe is used, the axial torsion of the soil sample will inevitably be increased, causing disturbance of the soil sample.

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