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Preparation apparatus and preparation method for hollow triaxial sample used for torsional shear test

A technology of triaxial sample and hollow torsional shear, which is applied in the field of geotechnical testing, can solve the problem that hollow samples are seldom used, and achieve the effect of good soil uniformity

Inactive Publication Date: 2016-09-07
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the traditional rock and soil test sample preparation method, the sand rain method is often used to increase the uniformity of the soil, but this method is currently mainly used for large-scale soil tests such as l

Method used

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  • Preparation apparatus and preparation method for hollow triaxial sample used for torsional shear test
  • Preparation apparatus and preparation method for hollow triaxial sample used for torsional shear test
  • Preparation apparatus and preparation method for hollow triaxial sample used for torsional shear test

Examples

Experimental program
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Effect test

Embodiment 1

[0030] A hollow torsional shear triaxial sample preparation device, comprising a funnel 1, a joint 2, a hard plastic tube 3, a template 4 and an annular disc 5. The neck of the funnel 1 is provided with an on-off valve 101 .

[0031] The funnel 1 is light in weight, and the on-off valve 101 has an OFF switch and an ON switch, respectively indicating that the valve is completely closed and opened. In addition, between the OFF switch and the ON switch, there are three gears with different degrees of open state, which are the first gear switch, the second gear switch, and the third gear switch. The switches of these three gears indicate that the valve opening is gradually increasing. Correspondingly, it is used in the three situations of loose sand, medium sand and dense sand.

[0032] The joint 2 is a Y-shaped tee joint.

[0033] The annular disk 5 is horizontally fixed on the upper end of the tripod 13 of the hollow torsional shear instrument through bolts 15 . A steel wire ...

Embodiment 2

[0041] A hollow torsional shear triaxial sample preparation device as described in Example 1, using the device to prepare a hollow torsional shear triaxial sample, comprising the following steps:

[0042] 1) Determine the relative compactness and quality of sand samples according to conventional methods.

[0043] 2) According to the relative compactness of the sand sample, determine the opening gear of the on-off valve 101, the loose sand corresponds to the first gear switch, the medium sand corresponds to the second gear switch, the dense sand corresponds to the third gear switch, and the extremely dense sand corresponds to the ON switch.

[0044] 3) see figure 1 As well as the connection relationship described in Example 1, install the rotary device, that is, the funnel 1 and the hard plastic pipe 3 and the pipelines and steel wires between them, and connect the horizontal steel wire I7 to the motor correspondingly.

[0045] 4) Carry out the measurement of the rotation spee...

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Abstract

The invention provides a preparation apparatus and preparation method for a hollow triaxial sample used for a torsional shear test. The apparatus comprises a funnel with a valve; the lower end of the funnel is connected with a flexible pipe; the flexible pipe is inserted into a Y-shaped T-junction; two flexible pipes are inserted into the lower end of the T-junction; the lower ends of the two flexible pipes are respectively connected with two hard plastic pipes; fixed rings sleeve the outer sides of the upper ends of the hard plastic pipes; steel wires bind the rings, are vertically and upwardly arranged and fixed at the joint of a horizontal steel wire; the horizontal steel wire is bound with the funnel and hanged on an annular disc; the annular disc is fixed on the upper ends of a three-leg column of a hollow torsional shear testing instrument through bolts; and a template is arranged below the funnel. The invention also discloses a method for preparing the hollow triaxial sample used for the torsional shear test by using the apparatus. The preparation apparatus provided by the invention can eliminate artificial errors produced in preparation of traditional hollow samples, enables a prepared sample to be more uniform and testing data to be more reliable, and is simple in structure, convenient in operation, low in price, green, environment-friendly and good in stability.

Description

technical field [0001] The invention belongs to the technical field of geotechnical tests, in particular to a hollow torsional shear triaxial sample preparation device and a preparation method thereof. Background technique [0002] The traditional hollow torsional-shear non-cohesion soil triaxial sample preparation method often adopts the dry ramming method. That is to say, first calculate the mass of each layer of soil according to the relative compactness and the number of layers required by the test plan, then suspend the funnel above the inner and outer templates, and rotate the funnel at a constant speed while loading the soil to make the soil fall Put it into the formwork, then use a wooden stick to roughly level the surface of the soil, and finally use a graduated vibrating rod to tamp the soil to the density required by the test. [0003] In the traditional sample preparation process, due to the narrow annular area between the inner and outer templates and the influ...

Claims

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Application Information

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IPC IPC(8): G01N1/28
CPCG01N1/28
Inventor 刘红肖杨刘汉龙向钰周
Owner CHONGQING UNIV