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A preparing and loading method of a broken rock test sample

A technology for crushing rock and rock, applied in the field of crushed rock sample preparation and loading, can solve problems such as difficulty in sample processing, rock sample crushing, rock sample size deviation, etc., and achieve accurate and reliable test results and strong applicability. Effect

Active Publication Date: 2016-02-24
西安华清科教产业(集团)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Especially for weak and broken rock blocks, sample processing is more difficult
During the sample making process, the rock sample is prone to breakage and fracture, and it is impossible to obtain a complete rock sample that meets the test requirements; however, due to the irregular shape of the rock block, it is difficult for the coring equipment fixture to fix it completely. The vibration generated during the working process of the equipment is likely to cause the deviation of the size of the rock sample, which in turn affects the test results of rock mechanical properties to a certain extent.

Method used

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  • A preparing and loading method of a broken rock test sample
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  • A preparing and loading method of a broken rock test sample

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] (1) Ash removal on the surface of the broken shale block;

[0040] (2) Inject glue into the broken shale block, the glue used is 307 unsaturated polyester resin, and its heat distortion temperature is 52°C. The pressure injection time is 6 minutes; place the broken rock block in the pressure barrel of the glue filling machine, and perform pressure injection on the broken rock block. After the completion, let it stand at room temperature for 60 minutes;

[0041] (3) The mold making mold is a self-made cuboid wooden box, and its size is 40×40×50cm;

[0042] (4) Fix the broken shale rock block in the box mold by using the method of cushioning gravel, pour C15 low-strength concrete into shape, and leave it to stand for 7 days after pouring into shape;

[0043] (5) Sampling of broken shale rock samples;

[0044] (6) Use an oven to heat the broken rock sample to 52°C, so that the unsaturated polyester resin in the rock sample reaches its thermal deformation temperature, and...

Embodiment 2

[0047] (1) Ash removal on the surface of the broken shale block;

[0048] (2) Inject glue into the broken shale block, the glue used is 307 unsaturated polyester resin, and its heat distortion temperature is 50°C. The pressure injection time is 10 minutes; place the broken rock block in the pressure barrel of the glue filling machine, and perform pressure injection on the broken rock block. After the completion, let it stand at room temperature for 30 minutes;

[0049] (3) The mold making mold is a self-made cuboid wooden box, and its size is 40×40×50cm;

[0050] (4) Fix the broken shale rock block in the box mold by using the method of cushioning gravel, pour C15 low-strength concrete into shape, and leave it to stand for 5 days after pouring into shape;

[0051] (5) Sampling of broken shale rock samples;

[0052] (6) Use an oven to heat the broken rock sample to 50°C, so that the unsaturated polyester resin in the rock sample reaches its thermal deformation temperature, an...

Embodiment 3

[0055] (1) Ash removal on the surface of the broken shale block;

[0056] (2) Inject glue into the broken shale block, the glue used is 307 unsaturated polyester resin, and its heat distortion temperature is 60°C. The pressure injection time is 5 minutes; place the broken rock block in the pressure barrel of the glue filling machine, and perform pressure injection on the broken rock block. After the completion, let it stand at room temperature for 90 minutes;

[0057] (3) The mold making mold is a self-made cuboid wooden box, and its size is 40×40×50cm;

[0058] (4) Fix the broken shale rock block in the box mold by using the method of cushioning gravel, pour C15 low-strength concrete into shape, and let it stand for 3 days after pouring into shape;

[0059] (5) Sampling of broken shale rock samples;

[0060] (6) Use an oven to heat the broken rock sample to 60°C, so that the unsaturated polyester resin in the rock sample reaches its thermal deformation temperature, and redu...

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Abstract

A preparing and loading method of a broken rock test sample is disclosed and is suitable for test sample preparation of a weak broken rock block. The method includes subjecting the weak broken rock block to surface dedusting, injecting colloid under pressure, putting the rock block after colloid injection into a hollow cuboid or cube box, pouring with cement mortar or low-strength concrete, molding, putting the rock block molded with the mortar or the low-strength concrete to a coring machine, coring, cutting the test sample to obtain a needed standardized rock test sample, heating the obtained rock test sample to allow the temperature of the colloid in the rock to achieve a heat distorsional temperature, and loading to perform mechanical property tests of the rock. The method is simple, convenient and high in applicability, and overcomes the problem that rock samples are easily broken and incomplete in a sampling process of the weak broken rock block. The standardized rock test sample is heated before loading, thus eliminating or reducing influences of the colloid on mechanical properties of the rock test sample as far as possible. Obtained test results are accurate and reliable.

Description

technical field [0001] The invention relates to a rock test method, in particular to a method for making a broken rock sample and loading the same. Background technique [0002] In the field of geotechnical engineering, the test of rock mechanical properties is the basis for related scientific research. The prerequisite for rock mechanical performance testing requires a relatively complete rock sample. For example, the standard rock sample size (Φ×H=50mm×100mm) stipulated by the International Society of Rock Mechanics. [0003] With the large-scale construction of highway and railway transportation systems in our country, more and more tunnel projects under complex geological conditions are emerging. Among them, the most common one is the tunnel engineering under the geological conditions of weak and broken surrounding rock. The rock blocks used for sample sampling are usually taken from the tunnel construction site, and most of them are irregular shaped blocks. Especial...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/44G01N3/00
Inventor 王军保刘新荣邵珠山王新宇
Owner 西安华清科教产业(集团)有限公司
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