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Anchorage damage test device and test method for fracture surrounding rock

A technology of anchorage performance and test method, which is applied in the direction of measuring device, preparation of test samples, and testing material strength by applying stable tension/pressure, etc. Changes and other problems to achieve the effect of preventing transitional stretching and volume deformation

Active Publication Date: 2022-07-08
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] For coal mine roadways, anchor rods are mostly used to anchor the roadways at present. However, due to the complex geomechanical environment of the surrounding rocks in cracks and the many factors involved in the process and equipment involved in anchoring engineering, the research on the anchoring control mechanism of surrounding rocks in cracks is far behind. Engineering practice, anchoring engineering design mostly relies on experience and semi-empirical methods
First of all, the surrounding rocks of the fractures are mostly discontinuous bodies, and their mechanical parameters are significantly different from those of the intact rock specimens. The mechanical properties of the rock mass have weakened, and the specific parameters are not easy to determine, which brings difficulties to numerical simulation and theoretical analysis; secondly , the detection of surrounding rock fissures in the support engineering site is complicated and difficult. It is difficult to carry out long-term monitoring by using ultrasonic surrounding rock fissure detectors or double-ended plugging drilling and water injection method. The characteristics and rules of the interaction with the bolt are not easy to spy
Finally, the current research on the mechanical properties of fractured rock mass is mainly based on experimental research. Scholars at home and abroad have carried out a lot of research on jointed rock masses in the form of single cracks, double cracks and multiple cracks, and achieved a series of results; for The test of anchorage force is mostly destructive pullout test at this stage, and most of the tests do not consider environmental factors such as the real surrounding rock structure and ground stress; the test equipment for the anchorage performance of surrounding rock can generally apply surface force to the rock specimen to simulate ground stress. However, it is difficult to conduct quantitative research on the influence of primary or secondary cracks in the surrounding rock on the anchoring force of the bolt, and it does not consider the real situation of elastic-plastic changes in the rock mass under high-stress conditions, and then failure.

Method used

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  • Anchorage damage test device and test method for fracture surrounding rock
  • Anchorage damage test device and test method for fracture surrounding rock
  • Anchorage damage test device and test method for fracture surrounding rock

Examples

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Effect test

Embodiment 1

[0055] like Figure 1 to Figure 3 As shown in the figure, the structure of the fracture surrounding rock anchorage damage test device specifically includes a servo hydraulic cylinder 1 , a connecting frame 2 , a loading frame 3 , an annular oil cylinder 4 and an anchor rod fixing fixture 5 . The damaged crack specimen 9 is loaded by the servo hydraulic cylinder 1 and the loading frame 3, thereby simulating the in-situ stress conditions of the anchoring section; the annular oil cylinder 4 is used for loading, so as to simulate the stress on the bolt along the direction of the bolt, and then through the device It can carry out pull-out test of anchoring section under different damage and fissure conditions, common pull-out test of anchor rod, pull-out test of non-damaged anchor section of anchor rod, etc., which provides a foundation for indoor test of anchor rod and research on anchoring performance of anchor rod.

[0056] The servo hydraulic cylinder 1 is fixed on the loading ...

Embodiment 2

[0067] like Figure 1 to Figure 3 As shown in the figure, a fracture surrounding rock anchorage damage testing device, its structure specifically includes a servo hydraulic cylinder 1, a connecting frame 2, a loading frame 3, an annular oil cylinder 4 and an anchor rod fixing fixture 5. Among them, such as Figure 4As shown, the servo hydraulic cylinder 1 is fixed on the loading frame 3, the servo hydraulic cylinder 1 includes an upper servo hydraulic cylinder 11, a rear servo hydraulic cylinder 13 and a side servo hydraulic cylinder 12, and the upper servo hydraulic cylinder 11 is arranged on the top of the loading frame 3 towards the For lower loading, the side servo hydraulic cylinders 12 are correspondingly arranged on both sides of the upper servo hydraulic cylinder 11, and the corresponding set of servo hydraulic cylinders have the same loading range. The rear servo hydraulic cylinder 13 can be loaded along the setting direction of the test bolt 8, so as to simulate the...

Embodiment 3

[0079] like Figure 1 to Figure 3 As shown in the figure, a fracture surrounding rock anchorage damage test device, the structure of which specifically includes a servo hydraulic cylinder 1, a connecting frame 2, a loading frame 3, an annular oil cylinder 4 and an anchor rod fixing fixture 5. The servo hydraulic cylinder 1 is fixed on the loading frame 3. The servo hydraulic cylinder 1 includes an upper servo hydraulic cylinder 11 and a side servo hydraulic cylinder 12. The upper servo hydraulic cylinder 11 is arranged on the top of the loading frame 3 to load downward, and the side servo hydraulic cylinder 12 corresponds to They are arranged on both sides of the upper servo hydraulic cylinder 11, and the corresponding set of servo hydraulic cylinders have the same loading range. There are at least two upper servo hydraulic cylinders 11, which independently load the damaged fracture specimen. Two corresponding side servo hydraulic cylinders 12 are respectively provided on both...

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Abstract

The invention provides a test device and a test method for the damage of the anchorage performance of cracked surrounding rocks, and relates to the technical field of bolt support performance tests. A servo hydraulic cylinder is fixed on the frame. The servo hydraulic cylinder includes an upper servo hydraulic cylinder and a side servo hydraulic cylinder. The servo hydraulic cylinder pressurizes the damaged fracture specimen or the complete rock specimen. The connection frame and the loading frame are fixedly connected. The end of the connecting frame and the end of the annular oil cylinder are provided with anchor rod fixing fixtures. One end of the test anchor rod is fixed by the anchor rod fixing fixture, and the other end is set in the damaged crack specimen. The ground stress is simulated by the servo hydraulic cylinder, and the annular The oil cylinder pulls the anchor rod. The device and method can complete the simulation test of the influence of surrounding rock damage on the anchoring force of the bolt, test the damage evolution law of the anchoring performance of the surrounding rock with different cracks, and can also test the mechanical performance of the bolt (cable).

Description

technical field [0001] The invention relates to the technical field of bolt support performance testing, in particular to an anchorage performance damage testing device for cracked surrounding rocks, and a method for using the device for testing. Background technique [0002] The discontinuity of surrounding rock is a common problem faced in geotechnical engineering construction. In a specific geological environment, the natural rock mass is subjected to the action of geological stress, resulting in the formation of various through or non-through joint fissures inside the rock mass. This fissure structure affects the physical and mechanical properties and characteristics of the surrounding rock, and causes safety problems often encountered in mining, tunnels, and underground spaces. Numerous theoretical studies and engineering practices have shown that the instability and failure of surrounding rock in roadways are mostly related to the expansion and penetration of internal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/12G01N3/02G01N1/36
CPCG01N3/12G01N3/02G01N1/36G01N2001/366
Inventor 邢明录王志赵晨尹延春贾敬龙李小亮张丰雪姚金鹏
Owner SHANDONG UNIV OF SCI & TECH
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