Rock size defect repair method and standard test piece preparation method

A standard test piece and defect repair technology, applied in the field of rock testing, can solve problems such as difficulty in making rock test pieces, and achieve the effects of great application value, improved utilization, and expanded scope of application

Pending Publication Date: 2019-10-15
NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a method for repairing rock size defects and preparing standard test piece

Method used

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  • Rock size defect repair method and standard test piece preparation method
  • Rock size defect repair method and standard test piece preparation method
  • Rock size defect repair method and standard test piece preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Embodiment 1: A kind of repairing method of rock size defect

[0042] The mold used is composed of 5 completely transparent square plexiglass plates, which are formed into a square box by sealing the glass plates with organic insulating silicone grease. Concrete preparation steps are:

[0043] (1) Thoroughly clean the rock to be tested and arrange it in the mold, such as figure 1 shown;

[0044] (2) Take the mixture of CY-39 epoxy resin and YS-T31 resin curing agent with a mass ratio of 100:34 and cast it in the mold;

[0045] (3) Put it in a constant temperature blast drying oven at 18°C ​​for 48 hours. When the specimen has a mechanical strength greater than 50MPa, the mold can be removed;

[0046] (4) Use a stone grinder to grind the test surface flat, which can be used as a test piece for abrasiveness, such as figure 2 shown.

[0047] The mechanical parameters of the specimens were detected by conventional methods, and the results are shown in Table 1.

[004...

Embodiment 2

[0051] Embodiment 2: A kind of preparation method of abrasiveness test specimen

[0052] The standard sample in this abrasiveness test is a cube with a side length of 40 mm. The mold used is composed of 5 completely transparent square plexiglass plates, which are formed into a square box by sealing the glass plates with organic insulating silicone grease.

[0053] In order to detect the law of abrasiveness of various rock-forming minerals and their combined working conditions, the following method was used to prepare the specimens for the abrasiveness test:

[0054] (1) Select various types of rocks with the same degree of weathering, the seven most common rock-forming minerals in nature such as image 3 shown;

[0055](2) Use a PCL straight-through crusher to grind the rocks into 15mm diameter particles, clean them and arrange them in the mold; take CY-39 epoxy resin and YS-T31 resin curing agent with a volume ratio of 100:34 The mixture is cast in a mould;

[0056] When ...

Embodiment 3

[0060] Embodiment 3: A kind of preparation method of uniaxial tensile test specimen

[0061] The specimen used in the uniaxial tensile test is dumbbell-shaped, and the two ends of the mold used are T-shaped boxes, which are connected as a whole by strapping plates. Each T-shaped box is composed of 10 completely transparent plexiglass plates. The upper part is opened and sealed with organic insulating silicone grease to form a whole, such as Image 6 shown.

[0062] Concrete preparation steps are:

[0063] (1) Thoroughly clean the rock to be tested, and place it on the board of the mold with T-shaped boxes at both ends. All interfaces are sealed with organic insulating silicone grease, and each end of the defective rock specimen has a length of 1.5 cm into the T. shaped box, such as Image 6 As shown, the purpose is to increase the contact surface between the resin and the defective rock specimen. After the resin is cured, it can provide sufficient bonding force, which can b...

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Abstract

The invention discloses a rock size defect repair method and a standard test piece preparation method for solving the technical problems that a rock test piece is difficult to manufacture, and that the test result is not intuitive and reliable enough in the prior art. The rock size defect repair method mainly comprises: taking CY-39 type epoxy resin and a YS-T31 type resin curing agent, uniformlymixing the components, and performing bubble removal treatment; taking a defective rock sample or a rock-forming mineral raw gemstone, thoroughly cleaning the surface thereof, and then placing the defective rock sample or the rock-forming mineral raw gemstone in a test piece mold with a smooth bottom surface; pouring the obtained castable into the test piece mold, and then performing the bubble removal treatment; and drying and curing under the condition 5-25 DEG C, and dismounting the mold. By adopting the rock size defect repair method disclosed by the invention, the problem that the test piece is difficult to be manufactured in various rock mechanical tests or innovative tests is solved; the prepared test piece can be used for visually observing the repair quality and monitoring the whole process of the test; and the utilization rate of rock samples with irregular shapes can be improved.

Description

technical field [0001] The invention relates to the technical field of rock detection, in particular to a method for repairing rock size defects and preparing a standard test piece. Background technique [0002] With the advancement of science and technology and the improvement of test equipment, the test level of rock mechanics in my country has also been greatly improved. Especially in recent years, with the construction of a large number of major water conservancy and hydropower projects, the characteristics of rock mechanics involved in the test put forward higher requirements. [0003] At present, the production of rock standard specimens mostly depends on core-taking, cutting and grinding of rock samples at the construction site. Due to the brittleness of rocks and the limitations of site and tools, not only the production cost is high, but also many specimens have different sizes. The defects on it make it difficult to use. [0004] On the other hand, for measuring t...

Claims

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Application Information

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IPC IPC(8): G01N1/36
CPCG01N1/36G01N2001/2893G01N2001/366
Inventor 付金伟刘淑丽
Owner NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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