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

Abstract

The invention belongs to the technical field of rock and soil mechanics triaxial test sample preparation, and discloses a vacuum fixed sand sample sample preparation device and a use method thereof, including a wing-type split film support tube, a liftable pipeline stabilizer and a vacuum console. Wing-type split film tube split mold, hollow wing and stable delta wing; vacuum control board includes triangular table, three-way ball valve a, three-way ball valve b and three-way ball valve c; liftable pipeline stabilization frame includes base, screw thread Rod a, threaded rod b, pipeline connecting plate, lower fixing piece a, lower fixing piece b, upper fixing piece a and upper fixing piece b. The invention fixes the film-supporting cylinder by applying a vacuum, and releases the vacuum to easily remove the film-supporting cylinder, which solves the problem of disturbing the sandy soil sample during the sample preparation process of the dry-packing method and when the film-bearing cylinder is detached, and improves the test efficiency. The stability and uniformity of the original physical properties of the sample.

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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