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Sand making device used for soil test

A technology for geotechnical testing and sandy soil, applied in the field of equipment for preparing sandy soil samples, can solve problems such as lack of accuracy of mechanical performance parameters, large deviations in test results, and influence on test results, so as to ensure consistency and repeatability sexual effect

Active Publication Date: 2013-09-18
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the test, if the sand samples cannot be prepared accurately and consistently, the test results will have large deviations, which will reduce the degree of acceptance
[0003] There are many shortcomings in the preparation of sand samples in centrifugal tests by general methods, such as: poor consistency, large randomness, and the stability of sand sample properties cannot be guaranteed in continuous tests; at the same time, the prepared samples The mechanical property parameters lack accuracy; sand samples cannot guarantee uniformity
These deficiencies will affect the test results

Method used

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  • Sand making device used for soil test
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  • Sand making device used for soil test

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Such as Figure 1-2 As shown, a sand making device for geotechnical testing, the device includes a barrel 2 for holding sand, a hose 3 for connection, and a nozzle 4 for sand flow out. The lower part of the bucket body 2 is connected with the spray head 4 through the hose 3, and the hose 3 enables the spray head 4 to move freely within a certain range. The upper part of the barrel body 2 is an upper drum with a diameter of 30 cm, and the lower part is a lower drum with a diameter of 6 cm. The staving body 2 acts as holding sand and soil, and can make sand and soil flow out from the staving body 2 bottom simultaneously. The nozzle 4 is composed of a nozzle body, a replaceable screen 5 and a baffle 6 . Due to the diversity of sand particle size components, screens with different apertures can be equipped according to specific conditions, preferably 5mm, 6mm, 7mm, 9mm, and the distance between adjacent meshes is 10mm. When in use, open the baffle 6 and replace the sieve...

Embodiment 2

[0021] refer to Figure 1-2 , a kind of sand making device that is used for geotechnical test, the top of this device staving 2 is the upper cylinder of diameter 25cm, and the bottom is the lower cylinder of diameter 4cm. All the other are with embodiment 1.

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Abstract

The invention relates to a sand making device used for a soil test. The device comprises a barrel body, a flexible pipe and a nozzle, wherein a lower part of the barrel body is connected with the nozzle through the flexible pipe, the barrel body is filled with sand, and the sand passes through the flexible pipe and then flows out through the nozzle. The nozzle comprises a nozzle pipe body, a replaceable screen and a baffle, wherein one end of the nozzle pipe body is connected with the flexible pipe, the other end of the nozzle pipe body is connected with the screen, the screen is provided with evenly distributed meshes with uniform aperture, and the baffle is arranged on the screen. Compared with the prior art, the device uses a replaceable screen with uniform mesh aperture, overcomes disadvantages of sand sample preparation in present geotechnical centrifuge tests, and is advantageous in that the prepared sand is high in consistency and good in repeatability.

Description

technical field [0001] The invention relates to a device for preparing sand samples, in particular to a sand making device for soil engineering tests. Background technique [0002] Ordinary geotechnical tests reduce the scale of the model to 1 / N of the prototype, which will cause problems such as soil and model gravity distortion, while geotechnical centrifugal tests increase the centrifugal acceleration field to N times the gravity field to restore the original stress state. Gravity distortion from model scaling. Therefore, in recent years, geotechnical centrifuges have been widely used in geotechnical engineering tests. Sand is a commonly used material in geotechnical centrifugal tests. In small-scale model tests such as centrifugal tests, accurate, consistent, and repeatable preparation of sand samples is crucial to reproducing the soil properties of the original site. During the test, if the sand samples cannot be prepared accurately and consistently, the test results ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28
Inventor 陈之毅沈昊黄雨李文阳未建树
Owner TONGJI UNIV