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Device and method for preparing undisturbed soil sample for torsional shear triaxial test of hollow cylinder

A technology of undisturbed soil samples and hollow cylinders, applied in the preparation of test samples, sampling devices, measuring devices, etc., can solve the problems of high professional quality requirements for experimenters, cumbersome operation steps, complicated sample preparation process, etc., and achieve improvement The effects of preparation standards, improved preparation accuracy, and simple operation

Pending Publication Date: 2022-05-06
LOGISTICAL ENGINEERING UNIVERSITY OF PLA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In recent years, although many scholars have used auxiliary equipment to prepare hollow undisturbed soil samples on the basis of traditional preparation methods, due to the obvious differences in auxiliary equipment, it has seriously affected the success rate of hollow triaxial soil sample preparation, which is not conducive to Specific geotechnical tests The application of hollow cylinder torsional shear triaxial tests makes it difficult to be popularized in geotechnical tests for the study of complex stress states of soil
At present, the dynamic and static hollow cylindrical torsional shear triaxial test technology is the main technical means to study the complex stress path of soil, which has higher requirements on the preparation process of hollow cylindrical soil samples. The accuracy requirements for soil samples in the test affect the research results and the test efficiency is very low
[0004] In summary, although researchers have used some auxiliary sample preparation tools to prepare dynamic and static hollow cylindrical torsional shear triaxial soil samples on the basis of traditional solid triaxial samples, these methods still have the following deficiencies: 1 .Generally, the requirements for the professional quality of the experimenters are high, the sample preparation process is very complicated, the success rate of sample preparation is low, and it is difficult for the experimenters to widely use
2. Due to the cumbersome and complicated operation steps in the preparation of the sample, the disturbance to the soil sample is relatively large. Since there is no fixed support structure as a support, it is easy to use when the two ends of the soil sample are flattened due to the uneven application of drilling torque. The soil sample is deformed, resulting in a large error in the preparation of the hollow triaxial soil sample, and it is difficult to meet the requirements for the accuracy of the sample in the geotechnical test
3. The traditional undisturbed soil sample preparation tools are mostly closed solid cylindrical structures, and the demoulding process after the hollow cylindrical torsional shear triaxial soil sample is prepared is relatively difficult, and it is difficult to ensure the preparation quality of the hollow cylindrical torsional shear triaxial soil sample

Method used

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  • Device and method for preparing undisturbed soil sample for torsional shear triaxial test of hollow cylinder
  • Device and method for preparing undisturbed soil sample for torsional shear triaxial test of hollow cylinder
  • Device and method for preparing undisturbed soil sample for torsional shear triaxial test of hollow cylinder

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Embodiment 1

[0035] Embodiment 1: see Figure 1-3 , a device for preparing a hollow cylindrical torsional shear triaxial test undisturbed soil sample, comprising a dowel 4, an undisturbed soil sample holder 8 and a base 12.

[0036] Described base 12 left and right sides are respectively fixedly connected with corbel support 9, and the top of described corbel support 9 is equipped with detachable crossbeam 5, during concrete implementation, the cross-section of crossbeam 5 is rectangle, each corbel support 9 The inboard side is provided with a plurality of corbel supports 10, and a plurality of corbel supports 10 are arranged from top to bottom and the corbel supports 10 on two corbel supports 9 correspond one-to-one in height in the vertical direction; The corbel support 9 is provided with a corbel support 10 at one height in the vertical direction, and the other corbel support 9 also has a corbel support 10 at the same height in the vertical direction.

[0037] The outer wall of the und...

Embodiment 2

[0051] Embodiment 2: The preparation method of the undisturbed soil sample of the hollow cylinder torsional shear triaxial test adopts the hollow cylinder torsional shear triaxial test undisturbed soil sample preparation device described in Example 1, and the steps of the preparation method are as follows:

[0052] The first step: take soil, according to the latest national "Standards for Geotechnical Test Methods" GB / T 50123-2019 Article 4.5 of the undisturbed soil sample preparation standard, pay attention to the layering direction of the soil sample, and take the rough soil blocks retrieved from the site in the Axial processing is carried out on the undisturbed soil support to prepare cylindrical undisturbed soil samples; the disturbance to undisturbed soil samples should be reduced in the soil extraction engineering, and the process and method of preparing cylindrical undisturbed soil samples are prior art.

[0053] The second step: leveling, select the undisturbed soil sam...

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Abstract

The invention relates to a hollow cylinder torsional shear triaxial test undisturbed soil sample preparation device and method.The preparation device comprises a rotatable dowel bar, a drill bit, a cylindrical soil sample fixator and a corbel support with a base, and the cylindrical soil sample fixator is installed on a corbel support of the corbel support; the rotatable dowel bar and the drill bit are installed on a cross beam of the corbel support, the cylindrical sample fixer is formed by assembling a semi-open film, circular ring steel sheets at the two ends and a fixed steel sheet support, the force transmission device is composed of the dowel bar and the circular drill bit, and a rotatable fixed sleeve is installed on the central axis of the cross beam. And the axes of the rotatable dowel bar, the drill bit and the circular sample fixer coincide with the axis of the bracket bracket with the base. According to the device, the height of the undisturbed soil sample fixer can be consistent with that of the sample, the flatness of the cylindrical undisturbed soil sample can be improved, and the problems of low preparation precision, difficulty in drilling, low sample preparation efficiency and large disturbance of the undisturbed soil sample of a hollow cylindrical sample are effectively solved.

Description

technical field [0001] The invention belongs to a soil sample preparation device for a geotechnical test, and more specifically relates to a simple preparation device and method for an undisturbed soil sample for a dynamic and static hollow cylinder torsional shear triaxial test. Background technique [0002] In the process of scientific research and engineering construction of geotechnical engineering, geotechnical test is often used as the main research method in geotechnical engineering. In engineering practice, after the soil structure is subjected to external forces, adverse geological phenomena such as strength attenuation and deformation increase will occur. important value. Therefore, the geotechnical test method has become a key link in scientific research and engineering construction. [0003] Generally speaking, soil engineering tests are usually carried out on the original soil sample and the remodeled soil sample. A large number of scientific research and engi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28G01N1/08G01N3/24G01N3/22
CPCG01N1/28G01N1/286G01N1/08G01N3/24G01N3/22
Inventor 穆锐陈金锋王培勇成鑫磊田镇华杨秀明孟妍程香
Owner LOGISTICAL ENGINEERING UNIVERSITY OF PLA