Bidirectional layered sample pressing device for preparing consolidation test sample and sample pressing method thereof

Abstract

The invention discloses a bidirectional layered sample pressing device for preparing a consolidation test sample and a sample pressing method thereof. The device is formed in the following manner: the inner wall of a guide cylinder is sleeved with a pressurization piston, the bottom surface of the flange of the pressurization piston is joined with the top of the guide cylinder, a cutting ring groove is formed in a position below the pressurization piston on the inner wall of the guide cylinder, the top of a cutting ring is embedded in the cutting ring groove of the guide cylinder, and the diameter of the cutting ring is equal to that of the pressurization piston; the cutting edge of the cutting ring is embedded in the hollow cavity of a circular ring-shaped projection on the top of a base; one or two disk-shaped cushion blocks are embedded in the inner cavity of the cutting ring; the distance between the bottom surface of the flange of the pressurization piston and the lower end face of the pressurization piston, the height of the inner wall above the cutting ring groove of the guide cylinder and the height of the cushion block are equal to 1 / n of the height of the cutting ring, and n is layering time in a test sample pressing process and is equal to 3 or 4. The pressing density of the test sample pressed by the device is more uniform, and interference caused by friction force of the ring wall in a sample loading process is small, so that the test data error of a consolidation test is small, and the test result is more accurate and reliable.

Description

technical field [0001] The invention belongs to the technical field of geotechnical tests, in particular to a bidirectional layered sample pressing device and a sample pressing method for preparing consolidation test samples in the geotechnical test. Background technique [0002] Before carrying out the consolidation test of the soil, the undisturbed soil sample or the disturbed soil sample should be prepared first. The preparation procedures of disturbed soil samples mainly include sampling, air drying (or drying), grinding, sieving, sample preparation and other procedures. Sample preparation is a very critical step in the preparation of disturbed soil samples. At this stage, there are mainly two sample preparation methods: compaction method and sample compression method. The sample compression method is to calculate the mass of the required wet soil according to the requirements of the compactness (or dry density) of the sample and the volume of the ring knife, and then w...

AI Technical Summary

Problems solved by technology

Since the total compression deformation of the samples produced by most consolidation tests is only 0-3 mm, and the deformation of cohesive soil with a high degree of compaction is even only about 1 mm, the degree of compaction of the samples is small along the direction of the sample depth. The inhomogeneity and the interference of the friction force of the ring wall will have a great impact on the compression deformation data of the sample test, resulting in a large deviation of the test data

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