Vacuum fixed sandy soil dry loading sample preparation apparatus and method for applying same

Abstract

The invention belongs to the field of technologies for preparing test samples for mechanical tri-axial tests on rock and soil, and discloses a vacuum fixed sandy soil test sample preparation apparatusand a method for applying the same. The vacuum fixed sandy soil test sample preparation apparatus comprises a wing type split film bearing barrel, a liftable pipeline stabilization rack and a vacuumcontrol desk. The wing type split film bearing barrel comprises split films, hollow wings and stabilization triangle wings; the vacuum control desk comprises a triangle desk, a three-way ball valve a,a three-way ball valve b and a three-way ball valve c; the liftable pipeline stabilization rack comprises a base, a threaded rod a, a threaded rod b, a pipeline connecting plate, a lower fixing sheeta, a lower fixing sheet b, an upper fixing sheet a and an upper fixing sheet b. The vacuum fixed sandy soil test sample preparation apparatus and the method have the advantages that the film bearingbarrel can be fixed by means of vacuum application and can be easily taken down by means of vacuum releasing, accordingly, the problem of disturbance on sandy soil test samples in sample preparation procedures by the aid of dry loading processes and when existing film bearing barrels are detached can be solved, and the stability and the uniformity of initial physical characters of test samples canbe improved.

Description

technical field [0001] The invention belongs to the technical field of rock and soil mechanics triaxial test sample preparation, and in particular relates to a vacuum fixed sand and soil dry packing sample preparation device and a use method. Background technique [0002] Sandy soil is generally a cohesive soil, and its triaxial samples are generally prepared by dry packing method, so the samples are easily disturbed. However, the traditional sample preparation tools are fastened with round hoops. On the one hand, there is no positioning, which leads to easy misalignment. On the other hand, because the tightening degree of the round hoop is affected by human factors, it is easy to cause excessive tightening force, resulting in when the hoop is detached. Excessive force caused the prepared sand sample to be greatly disturbed. In addition, there is no exhaust groove inside the existing conventional film-bearing cylinder, which often leads to the failure of the rubber film to ...

AI Technical Summary

Problems solved by technology

[0002] Sandy soil is generally cohesive soil, and its triaxial sample is generally prepared by dry packing method, so the sample is easily disturbed

However, the traditional sample preparation tools are fastened with round hoops. On the one hand, there is no positioning, which leads to easy misalignment. On the other hand, because the tightening degree of the round hoop is affected by human factors, it is easy to cause excessive tightening force, resulting in when the hoop is detached. Excessive force causes the prepared sand sample to be greatly disturbed

In addition, there is no exhaust groove inside the existing conventional film-bearing cylinder, which often leads to the failure of the rubber film to fit the split mold, which makes the edge of the sampler easy to fit tightly with the rubber film, forming a negative pressure during the pulling process , leading to sand upwelling

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