Sample preparing machine and method of soil body rapid triaxial test

Abstract

The invention relates to a sample-making device for soil quick triaxial test and a sample-making method thereof. The sample-making device comprises a sample-beating cylinder and a sample-beating device, wherein the sample-beating cylinder comprises a base, a three-section mould, a lower clamp, an upper clamp and a protective cylinder; the sample-beating device comprises a power transmission plate, a compact hammer, a guide bar, a stopper; the base of the sample-beating cylinder is a double-faced base with one face of the central part of the base is a circular fixed groove, the other face of which is a circular fixed groove with a circular hole at the center; the three-section mould is composed of three circular-arc metal sheets with a central angle of 120 DEG. The sample-making method comprises: fixing the guide bar on the base, laminatedly compacting the soil according to the required dry density, sealing the central hole of the base with clay after being compacted, laminatedly pouring sands into the central cylinder hole and compacting the soil according to the required density, finally sealing the upper hole of the cylinder hole with clay. The invention has simple use, convenient operation, testing time saving, good effect for making uniform, standard sand-core cylinder, can be popularized in the field of soil test technique.

Description

technical field [0001] The invention relates to a sample preparation device and a sample preparation method for a rapid triaxial test of soil, and belongs to the technical field of soil engineering tests. Background technique [0002] For the triaxial consolidation shear test of cohesive soil and gravel-clay, because the permeability coefficient of cohesive soil is very low and the drainage is extremely slow, a middle triaxial (diameter Φ=101mm) consolidation drainage shear test is often completed according to the conventional test method. It takes more than 7 days, and for a large triaxial (diameter Φ=300mm), one test even takes nearly a month, and it takes several months to complete a group (4 to 5 tests), which is extremely time-consuming. [0003] In order to solve the above-mentioned problem of long test time, a rapid triaxial shear test method is adopted, which adopts a cylindrical sample (called sand core cylinder sample) with a cylindrical sand core filled with sand ...

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Problems solved by technology

[0004] However, there is no ready-made sample preparation device for the sand core cylinder sample used in the rapid triaxial test, and the existing standard sample preparation device for cylindrical samples cannot be directly used to make sand core cylinder samples. Therefore, it is necessary to redesign and configure the sand core cylinder At the same time, because the sand core cylinder sample and the conventional cylinder sample are both cylindrical, and their height and diameter are the same, the sand core cylinder sample preparation device has many parts that can be compared with the cylindrical sample preparation device. Therefore, when designing the sample preparation device for sand core cylindrical samples, its versatility for cylindrical samples should also be considered to avoid resource waste caused by repeated configuration

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