Grain direct shear test sample preparation device and sample preparation method

Abstract

The invention discloses a grain direct shear test sample preparation device and a sample preparation method. The grain direct shear test sample preparation device comprises a lower cutting box, an upper cutting box, a box cover, an inserting pin, an impacting hammer and an air exhaust device (a motor, an air pump, an air storage tank and a switch). The problems of sample preparation devices and sample preparation technology for grain bulk direct shear tests are solved; through the sample preparation device and the sample preparation method, grain sample forming is guaranteed, height, flatness and compactness of a whole grain sample are ensured, and sample preparation efficiency is improved. The sample preparation device and the sample preparation method are simple to operate and suitable for direct shear sample preparation of different grain varieties.

Description

technical field [0001] The invention relates to the field of civil engineering geotechnical tests, and more particularly relates to a sample preparation device and sample preparation technology for grain direct shear tests. Background technique [0002] The grain direct shear instrument is widely used to measure the internal friction angle of grain, but the density of the prepared samples is generally not considered. The results of research and engineering practice have shown that the grain density has a great influence on the internal friction of grain, which in turn affects the design parameters of the grain silo. . It is difficult to obtain grain samples with higher density by using existing methods. On the one hand, most of the existing specifications are based on the preparation of soil samples, and the grain particles are evenly distributed. It is difficult to obtain samples with different densities when compacted by conventional methods; on the other hand, On the one...

AI Technical Summary

Problems solved by technology

[0002] The grain direct shear instrument is widely used to measure the internal friction angle of grain, but the density of the prepared samples is generally not considered. The results of research and engineering practice have shown that the grain density has a great influence on the internal friction of grain, which in turn affects the design parameters of the grain silo.

It is difficult to obtain grain samples with higher density by using existing methods. On the one hand, most of the existing specifications are based on the preparation of soil samples, and the grain particles are evenly distributed. It is difficult to obtain samples with different densities when compacted by conventional methods; on the other hand, On the one hand, the grain particles are easily deformed and broken, and the method of compacting the soil cannot be used for compaction

The existing equipment and sample preparation technology cannot meet the preparation of grain direct shear test samples with different densities, so it is necessary to develop a grain direct shear test sample preparation device and sample preparation technology

Images