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Sample preparation method for eliminating rubber membrane penetration effect of strong-weathered rock

A rubber film and strong weathering technology, which is applied in the preparation, sampling, and strength characteristics of test samples, can solve the problems of test result distortion, etc., and achieve short sample period, true and reliable triaxial shear test results, and high precision Effect

Active Publication Date: 2019-03-26
INST OF ROCK & SOIL MECHANICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art, to provide a sample preparation method that eliminates the embedding effect of strongly weathered rock rubber film with simple operation, and can effectively solve the problem of rubber film embedding effect of strongly weathered rock in the current indoor triaxial shear test. Distortion of Test Results Caused by Membrane Insertion Effect

Method used

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  • Sample preparation method for eliminating rubber membrane penetration effect of strong-weathered rock
  • Sample preparation method for eliminating rubber membrane penetration effect of strong-weathered rock
  • Sample preparation method for eliminating rubber membrane penetration effect of strong-weathered rock

Examples

Experimental program
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Effect test

Embodiment 1

[0040] The test material of embodiment 1 is the strongly weathered granite of Xiamen City, and particle content is composed of 15.0wt% gravel, 50.0wt% sand and 35.0wt% clay, and the sample size is a standard triaxial sample (diameter 50.0mm, height 100.0mm), the sample is the undisturbed original sample, the thickness of the rubber film used is d 0 is 0.3mm, and the consolidation confining pressure is 500kPa.

[0041] Such as figure 1 As shown, a sample preparation method to eliminate the rubber film embedding effect of strongly weathered rocks includes the following steps:

[0042] (1) Sample cutting

[0043] Take a soil column slightly larger than the size of the triaxial sample (diameter 50.0mm, height 100.0mm), first cut the soil column with a soil cutter until the height of the sample is 102.0mm, and then cut the side of the sample with a wire saw , cut the sample into a cylinder with a diameter of 50.0mm, and finally cut the sample with a wire saw to make the height o...

Embodiment 2

[0063] In order to better test the reliability and practicability of a sample preparation method that eliminates the rubber film embedding effect of strongly weathered rock of the present invention, select a test material different from the particle composition of Example 1, and the test material of Example 2 is Shenzhen The strong weathered granite in the city, the particle content is composed of 10.0wt% gravel, 45.0wt% sand and 45.0wt% clay. At the same time, in order to test the influence of sample size, rubber film thickness and consolidation confining pressure on the sample preparation method, this example adopts a different sample size and rubber film thickness from Example 1. The sample size is 38.0mm in diameter and 38.0mm in height 80.0mm, the thickness of the rubber film used is d 0 is 0.2mm, and the consolidation confining pressure is 500kPa.

[0064] Such as figure 1 As shown, a sample preparation method to eliminate the rubber film embedding effect of strongly w...

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Abstract

The invention discloses a sample preparation method for eliminating a rubber membrane penetration effect of a strong-weathered rock. The principle is that cured liquid latex is used as filler, so thatan uneven test sample surface becomes smooth, and the rubber membrane penetration effect of the strong-weathered rock is eliminated. Preparation steps of a test sample comprise the steps of cutting the sample, filling pits, smoothening the surface, molding the test sample and filling the sample. According to the technical scheme provided by the invention, adverse effects of the rubber membrane penetration effect of the strong-weathered rock can be effectively eliminated and a tested three-axis shear test result is real and reliable and has high precision. The sample preparation method has thecharacteristics of toxin-free and harmless testing materials, low construction price, feasible method, convenience for operation, short testing period and the like; and the problem that a rubber membrane is broken by protruding quartz grains on the surface of the test sample under high pressure so that the test fails also can be avoided by the technical scheme.

Description

technical field [0001] The invention relates to a sample preparation method for triaxial samples in geotechnical tests, and more particularly relates to a sample preparation method for eliminating the embedding effect of strongly weathered rock rubber films. Background technique [0002] Strongly weathered rock is a special soil formed by weathering, which has different mechanical properties from sandy soil and clayey soil formed by deposition. At present, the triaxial shear test carried out in the laboratory is an important means to obtain the mechanical index of this kind of soil, and the constitutive model parameters used in some designs also depend on the triaxial shear test results. However, because the sand grains left by the parent rock are often embedded in the clay matrix, the cylindrical samples used in the test often have uneven surfaces or large pits. When carrying out conventional triaxial drainage or undrained shear tests, the confining pressure Application ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28
CPCG01N1/28G01N33/24G01N2001/2873G01N2203/0298G01N2203/0256G01N3/24G01N1/286G01N2001/305
Inventor 张先伟刘新宇马超杜基俊李锐铎陈成
Owner INST OF ROCK & SOIL MECHANICS CHINESE ACAD OF SCI
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