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Preparation method of original-state sample for hollow torsional shear test of strong-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. Achieve the effects of improving the production success rate and quality, reducing sample shear fracture, sample preparation success rate and sample quality

Active Publication Date: 2021-02-12
INST OF ROCK AND SOIL MECHANICS - CHINESE ACAD OF SCI
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  • 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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  • Preparation method of original-state sample for hollow torsional shear test of strong-weathered rock and residual soil
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  • Preparation method of original-state sample for hollow torsional shear test of strong-weathered rock and residual soil

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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 and 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 and image 3 Describes the equipment and procedures used to cut soil samples, such as figure 2 and image 3 As shown, the main...

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 preparation method of an original-state sample for a hollow torsional shear test of strong-weathered rock and residual soil. The method comprises the following steps: (1) cutting an original-state solid sample: taking an original-state soil block, and cutting the soil block to a height higher than a standard height by using a soil cutter; (2) fixing the solid sample: sleeving the soil sample with a preservative film, and putting the soil sample into a split cylinder mold; (3) forward drilling of the center of the solid sample: adjusting the extension length of a forcetransmission guide rod of an inner cavity cutter, and withdrawing the inner cavity cutter according to an original path; (4) reversely drilling the center of the solid sample: taking out the cylindermold filled with the soil sample and a fixed clamping ring, detaching a rotary lower chassis with a groove from the device, and re-fixing the rotary lower chassis on the chassis; (5) carrying out step-by-step chambering: reinstalling the test sample; (6) finely trimming the sample; and (7) evaluating the quality of the test sample: wrapping the prepared test sample with a rubber membrane, and mounting the test sample on a hollow torsional shear apparatus. The method has the characteristics of simplicity, low cost, low material consumption, low in-situ sampling requirement, high sample preparation success rate and the like.

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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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 AND SOIL MECHANICS - CHINESE ACAD OF SCI
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