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Fast preparation device and preparation method for rock direct-tension sample

A technology for tensile samples and preparation devices, which is applied in the field of rock mechanics tests, and can solve the problems of insufficient sample accuracy, eccentric tension, and high cost

Pending Publication Date: 2019-10-22
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The results obtained from the Brazilian split test sometimes cannot obtain enough information needed to analyze the problem, and even cannot reflect the essence of the problem, which limits the further development and application of this research method
The results of the direct tensile test are more in line with the actual situation of rock tension, but the processing of the rock sample is more difficult and the cost is higher; and in the sample preparation or test, human factors are greatly affected, and the specimen is placed slowly, which is not conducive to large-scale testing. Batch test test; in addition, due to insufficient precision of the sample or unreasonable loading during the test loading process, sometimes eccentric tension occurs, and the tensile force cannot be guaranteed to pass through the central axis of the sample

Method used

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  • Fast preparation device and preparation method for rock direct-tension sample
  • Fast preparation device and preparation method for rock direct-tension sample
  • Fast preparation device and preparation method for rock direct-tension sample

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] A rapid preparation device for rock direct tensile samples, such as Figure 1-10 As shown, it includes a base 1 and an inverted L-shaped bracket 2, the base 1 and the inverted L-shaped bracket 2 form a basic frame, and the inside of the basic frame is vertically provided with a slide rail 3, and the slide rail 3 is provided with a sliding block that matches it 4. The slider 4 is connected with a rotary pull-down mechanism through the first connecting piece 14, and a steel sleeve 12 is arranged under the rotary pull-down mechanism, and the rock rod 11 can be rotated into the steel pipe 10 filled with an appropriate amount of cement through the rotary pull-down mechanism , the other end of the steel pipe 10 has been blocked with a plastic buckle cover 9 to prevent the glue from flowing out;

[0075] A horizontal adjustment platform 5, an inclination adjustment platform 6, and an electromagnetic chuck A7 are successively installed on the base 1, and a steel sleeve 8 is ads...

Embodiment 2

[0077] A rapid preparation device for rock direct tensile samples, the structure is as shown in Example 1, the difference is that the rotary pull-down mechanism includes a bearing seat 15, a bearing 16, a rotating shaft 17 and a pull-down handle 23, such as Figure 9-10 As shown, the bearing seat 15 is connected to the slider 4 through the first connection 14 and can follow the slider 4 to move up and down along the slide rail 3. Specifically, the first connection 14 includes a vertical connecting plate and a horizontal connecting plate, The vertical connecting plate is fixed on the side of the slider 4 by bolts, and the bearing seat 15 is fixed by bolts on the horizontal connecting plate. A through hole is arranged in the middle of the horizontal connecting plate. The bearing 16 is installed on the bearing seat 15, and the rotating shaft 17 passes through the through hole and the bearing 16. Inner ring fixed connection;

[0078] A rotating disk 18 is fixed above the rotating ...

Embodiment 3

[0082] A rapid preparation device for direct tensile samples of rocks, the structure is as shown in Example 1, the difference is that the steel sleeve 8 plays the role of placing the combination of the plastic buckle cover 9 and the steel pipe 10, wherein the steel sleeve 8 and the plastic buckle The profile of cover 9 is substantially similar, and the shape is as Figure 4 , 5 As shown, the steel sleeve 10 need not be too high, the inner diameter of the steel sleeve 10 matches the outer diameter size of the plastic buckle cover 9, and the inner diameter of the plastic buckle cover 9 matches the outer diameter size of the steel pipe 10; A proper amount of liquid cement will be injected into the steel pipe 10 in advance, and the lower end must be blocked with a plastic buckle cover 9. The purpose is to bond the rock rod 11 in the steel pipe 10 sealed with the plastic buckle cover 9, which can save economic costs. Because steel pipe 10 can be cut by standard steel pipe (section...

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Abstract

The invention relates to a fast preparation device and a preparation method for a rock direct-tension sample and belongs to the technical field of rock mechanics test. The device comprises a base andan inverted L-shaped support. The base and the inverted L-shaped support form a basic framework. The basic framework is internally and vertically provided with a sliding rail. The sliding rail is provided with a matched sliding block. A rotating pull-down mechanism is connected on the sliding block through a first connector. A steel sleeve is arranged under the rotating pull-down mechanism. The base is equipped with a horizontal adjustment platform, a tilt adjustment platform and an electromagnetic chuck A. A steel sleeve is adsorbed on the electromagnetic chuck A. The rock direct-tension sample comprises a rock bar, steel tubes sleeving the both ends of the rock bar respectively, and plastic buckle covers arranged at the two ends of the steel tubes. The device and method can rapidly prepare the high-precision double-end steel tube cemented type rock direct-tension sample through a rotating pull-down method, can effectively eliminate the defects of uneven cementation and eccentric cementation and the like, and have the advantages of being economical and convenient, simple in structure and flexible in operation and the like.

Description

technical field [0001] The invention relates to the technical field of rock mechanics tests, in particular to a device for quickly preparing a rock direct tension sample, a method for preparing a sample, and a method for performing a tensile test using the sample. Background technique [0002] Tensile strength is an important mechanical parameter of rock. The failure or instability of many rock materials is often caused by partial or overall tensile stress. Rock mass tensile failure is also a common failure type in actual engineering. The excavation of underground caverns and roadways will cause the redistribution of surrounding stress, and tensile stress is likely to appear on the vault or side wall; near the surface of artificial slope, due to the existence of free surface, tensile stress often exists; in coal mining or During the roadway excavation, dynamic disaster accidents such as roof fall, rock burst, and coal and gas outburst often occur, and these are often related...

Claims

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Application Information

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IPC IPC(8): G01N1/28G01N1/36G01N3/08G01N3/04
CPCG01N1/28G01N1/36G01N3/08G01N3/04G01N2001/364G01N2203/0298G01N2203/0017G01N2203/0075
Inventor 邢明录赵同彬张巍张丰雪李小亮尹延春黄彬
Owner SHANDONG UNIV OF SCI & TECH
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