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Device and method for testing tensile and compressive creep of inter-hole rock bridges by using expansion agent

A technology of expansion agent and tensile strength, which is applied in the device and field of testing the tensile strength, compression and creep resistance of inter-hole rock bridges by using expansion agent, which can solve the problems of difficulty, inability to guide rock stability, unreliable method of tensile strength, etc. problems, to achieve the real tensile modulus, the measurement results are true and reliable

Active Publication Date: 2019-07-23
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the stability of rock under long-term tension or long-term compression proposed independently and used in engineering, and measures and calculates the mechanical parameters of rock samples. And it cannot guide the stability of rocks under long-term tension or long-term compression. A technology and method for testing the tensile and compressive creep of inter-hole rock bridges using expansion agents has been independently designed. This method can be measured by factual monitoring. Various mechanical parameters can provide real-time feedback on the stress of rock samples, and this method is simple to operate, low in cost, and simple in structure. It can be applied to the detection of tensile and compressive modulus of rock samples of various shapes and sizes, and has wide application Significance and application prospect of engineering practice

Method used

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  • Device and method for testing tensile and compressive creep of inter-hole rock bridges by using expansion agent
  • Device and method for testing tensile and compressive creep of inter-hole rock bridges by using expansion agent
  • Device and method for testing tensile and compressive creep of inter-hole rock bridges by using expansion agent

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Embodiment 1

[0038] see Figure 1-6 , a device for testing the tensile, compressive and creep resistance of inter-hole rock bridges using an expansion agent, it includes a rock sample 2 for testing, and a plurality of small holes 3 are processed inside the rock sample 2, and the holes 3 The inside is filled with an expansion agent 1; a rock bridge 7 is formed between two adjacent small holes 3, and distributed optical fibers 4 and transparent mesh paper for measuring the stress on the rock bridge 7 are arranged in different areas of the rock bridge 7 6 or stress monitoring point 8; inside the small hole 3, steel plates 10 are placed on both sides close to the rock bridge 7, and two adjacent steel plates 10 are connected by steel bars 9. By using the above-mentioned device, various mechanical parameters can be monitored and measured in real time, and the force situation of the rock sample can be fed back in real time, and this method is simple in operation, low in cost, and simple in struct...

Embodiment 2

[0048] Adopt any one of the test method utilizing expansion agent to test inter-hole rock bridge tensile compression and creep resistance device, it is characterized in that he comprises the following steps:

[0049] Step1: Material preparation: prepare rock sample 2 with a relatively flat surface, drill bit, distributed optical fiber 4, expansion agent 1, transparent grid paper 6 with certain flexibility and toughness, steel plate 10 with certain strength and rigidity and steel bars 9;

[0050] Step2: Make transparent grid paper 6: Use transparent paper with a certain degree of flexibility and toughness, use a ruler and a marker pen to draw a grid on the transparent paper, the side length of the grid is a, and the grid can deform as the rock deforms , so as to well reflect the stress of the rock;

[0051] Step3: Make the stress balance device: use the steel plate 10 and the steel bar 9 with higher rigidity and strength, according to the size of the small hole 3 drilled on th...

Embodiment 3

[0056] A test method for testing the tension, compression and creep resistance of inter-hole rock bridges using an expansion agent. A rock sample 2 is taken on a rock with a smooth surface, and small holes 3 are drilled on the rock sample 2 with drill bits of different sizes according to requirements. Adjust the amount of expansion agent 1 by controlling the aperture and hole distance of the small hole 3, and further adjust the size of the force. When measuring the single stress 5, a steel plate 10 connected with a steel bar 9 can be arranged inside the small hole 3, or a plurality of small holes can be arranged. The hole 3 measures the compressive stress 5, and distributes the distributed optical fiber 4 at the rock bridge 7 between the small holes 3, or places a stress monitoring point 8 on it, and can also use a transparent paper with certain ductility to make a transparent grid 6 , and then inject the prepared rock expansion agent 1 into the small hole 3, using the characte...

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Abstract

The invention discloses a device and method for testing tensile and compressive creep of inter-hole rock bridges by using an expansion agent. The device comprises a rock sample for testing, wherein aplurality of small holes are processed inside the rock sample, the expansion agent is filled inside the small holes; a rock bridge is formed between two adjacent small holes, and distributed optical fibers, transparent mesh paper or stress monitoring points for measuring stress on the rock bridges are arranged in different regions of the rock bridges; steel plates are placed on both sides near therock bridges inside the small holes, and two adjacent steel plates are connected by steel bars. The method can monitor and measure various mechanical parameters and timely feedback on the force of the rock sample in real time, is simple in operation, low in cost and simple in structure, can be applied to quantity detection of tensile and compressive molds of rock samples of various shapes and sizes, and has a wide range of engineering practice significance and application prospects.

Description

technical field [0001] The device relates to a technology and method for testing the tensile and compressive creep of rock bridges between holes by using an expansion agent, and is mainly suitable for guiding the stability of rocks under long-term tension or long-term compression, and measuring and calculating mechanical parameters of rock samples. Background technique [0002] In the study of rock tensile strength testing, it was found that the test results of the direct method and the indirect method are very different, which is likely to be caused by the unequal tensile and compressive elastic moduli of the material. Only the tensile strength of the material can be measured. In order to determine the relationship between the test value of the indirect method rock tensile strength and the real tensile strength, it must be compared with the compressive elastic modulus or the tension-compression elastic modulus. It can be seen that the unequal elastic modulus of tension and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/02G01N3/06G01N3/08G01N1/28
CPCG01N1/28G01N3/02G01N3/068G01N3/08
Inventor 刘杰高素芳韩绍康黎照孙涛谢晓康唐洪宇李洪亚兰俊张瀚李远航何卓文莫承林罗越文姜锋
Owner CHINA THREE GORGES UNIV
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