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A method for preparing undisturbed samples for hollow torsional shear test of strongly weathered rock and residual soil

A technology of hollow torsional shearing and residual soil, which is applied in the field of undisturbed rock and soil samples, can solve the problems that the mechanical properties of such rock and soil materials cannot be truly described, it is not suitable for strongly weathered rock and residual soil, and it cannot reflect the structural characteristics. It achieves the effect of low in-situ sampling requirements, easy-to-understand principles, and reduced sampling requirements

Active Publication Date: 2022-04-01
INST OF ROCK & SOIL MECHANICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the first method is only suitable for preparing remodeled samples, and most studies have shown that remodeled samples cannot reflect the structural properties commonly found in strongly weathered rocks and residual soils, so they cannot truly describe the mechanics of such geotechnical materials nature
The second method is more widely used in cohesive soils, but it is also not suitable for strongly weathered rocks and residual soils
Under the action of mechanical drilling, these bonds are damaged, which leads to a decrease in the strength of the soil, leading to unreliable or invalid test results
[0004] Therefore, in view of the fact that the current sample preparation method is not suitable for the preparation of undisturbed hollow torsional shear specimens of strongly weathered rock and residual soil, there is an urgent need for a method for preparing undisturbed hollow torsional shear test specimens of strongly weathered rock and residual soil, which is beneficial to this Carry out anisotropy research on soil-like bodies and evaluate the mechanical behavior of soil more accurately, so as to provide reliable parameters for engineering design

Method used

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  • A method for preparing undisturbed samples for hollow torsional shear test of strongly weathered rock and residual soil
  • A method for preparing undisturbed samples for hollow torsional shear test of strongly weathered rock and residual soil
  • A method for preparing undisturbed samples for hollow torsional shear test of strongly weathered rock and residual soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The test material of this embodiment 1 is the strongly weathered granite from Fujian Province, the particle content is composed of 10.0% gravel, 48.0% sand and 42.0% clay, and the sample size is a standard hollow torsional shear sample (inner diameter 60.0mm, outer diameter 100.0mm, height 200.0mm), the sample is the undisturbed original sample.

[0040] Such as figure 1 , figure 2 with image 3 Shown, a kind of method for preparing strongly weathered rock and residual soil hollow torsional shear test undisturbed sample, its steps are:

[0041] (1) Cut the original solid sample:

[0042] Take a piece of soil larger than the size of the standard hollow torsional shear sample (outer diameter 100.0mm, inner diameter 60.0mm, height 200.0mm), first cut the soil sample with a soil cutter (ordinary) until the sample height is 215.0mm. figure 2 with image 3 Describes the equipment and procedures used to cut soil samples, such as figure 2 with image 3 As shown, the m...

Embodiment 2

[0064]In order to better test the general applicability of a method for preparing strong weathered rock and residual soil hollow torsional shear test sample of the present invention, select the test material that is different from the particle composition in Example 1, the test material in Example 2 It is a granite residual soil in Hainan Province, and its particle content is 10.0% gravel, 31.0% sand and 59.0% clay. In addition, in order to compare the influence of the selection of the last two levels of target diameters in step (5) on the effect of sample preparation, the target diameters of progressive hole expansion used in this example are 30.0mm, 40.0mm, and 50.0mm , 60.0mm.

[0065] Such as figure 1 Shown, a kind of method for preparing strongly weathered rock and residual soil hollow torsional shear test undisturbed sample, its steps are:

[0066] (1) Cut the original solid sample:

[0067] Take a piece of soil larger than the size of the standard hollow torsional sh...

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Abstract

The invention discloses a method for preparing an undisturbed sample of a hollow torsional shear test on strongly weathered rock and residual soil. (2) Fix the solid sample: cover the soil sample with plastic wrap and put it into the split cylinder mold; (3) Drill the center of the solid sample forward: adjust the position of the force transmission guide rod of the inner cavity cutter Extend the length, withdraw the inner cavity cutter according to the original way; (4) Reverse drilling in the center of the solid sample: take out the cylinder mold with the soil sample and the fixed snap ring, and remove the rotating lower chassis with the groove from the device (5) Reaming holes step by step: reinstall the sample; (6) Refining the sample; (7) Evaluating the quality of the sample: Cover the prepared sample with a rubber film Wrapped, installed on the hollow torsion shear instrument. The method is simple, low in cost, less in consumables, low in situ sampling requirements, and high in the success rate of sample preparation.

Description

technical field [0001] The invention relates to the technical field of undisturbed soil samples of rock and soil (hollow torsional shear test in geotechnical tests), and more specifically relates to a method for preparing undisturbed samples of hollow torsional shear tests for strongly weathered rock and residual soil, which is suitable for sandy Preparation of hollow torsional shear specimens of various soils with general engineering properties, such as soil and cohesive soil. Background technique [0002] Various weathered rocks and residual soils are widely distributed in the southeastern coastal areas of China. The mechanical properties of these special soils are quite different from the sedimentary soils that have been widely concerned at present (Zhang Xianwei, Liu Xinyu, Kong Lingwei, Xu Chao. Granite residuals under blasting impact load Experimental Research on Mechanical Response of Soil. Chinese Science: Technical Science, 2019, 49(06): 690-702). Currently, studie...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/36G01N1/28
CPCG01N1/36G01N1/286G01N2001/2873G01N2203/0298
Inventor 张先伟刘新宇徐倚晴王港陈成马超
Owner INST OF ROCK & SOIL MECHANICS CHINESE ACAD OF SCI