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A device and method for in-situ testing of rock tensile strength

A technology for tensile strength and in-situ testing, which is applied in the direction of measuring devices, strength characteristics, and the use of stable tension/pressure testing material strength, etc., can solve the problem of high cost of rock sample processing, inaccurate measurement results, and rock sample Problems such as uneven force, achieve uniform force, prevent sliding, and reduce friction

Active Publication Date: 2021-11-02
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantage is that the operation is relatively simple; the disadvantage is that the cost of rock sample processing is too high; during the test clamping process, the force near the fixture is concentrated, the rock sample is unevenly stressed, and the rock sample will be disturbed when it is taken out. make the results inaccurate

Method used

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  • A device and method for in-situ testing of rock tensile strength
  • A device and method for in-situ testing of rock tensile strength
  • A device and method for in-situ testing of rock tensile strength

Examples

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Effect test

Embodiment 1

[0059] like Figure 1-11 Shown, a kind of rock tensile strength in-situ testing device, it comprises the coring drilling machine that is used for carrying out borehole sampling to rock sample, and described coring drilling machine comprises drilling machine base 1-2, and the core drilling machine of described drilling machine base 1-2 The top is equipped with a motor 1-4, the output shaft of the motor 1-4 is connected with the input shaft of the gearbox 1-5, and the motor 1-4 and the gearbox 1-5 are all installed on the hand-operated lifting mechanism, The hand-operated lifting mechanism cooperates with the handle 1-3 and drives it up and down; the output shaft of the gearbox 1-5 is equipped with a drill rod for drilling. By adopting the testing device with the above-mentioned structure, it can ensure that the rock pillar can be kept in the corresponding rock sample area during the testing process, thereby ensuring the accuracy of subsequent measurement data.

[0060] Further...

Embodiment 2

[0067] The testing method of any described rock tensile strength in-situ testing device, it comprises the following steps:

[0068] When testing with half threaded drill pipe 1:

[0069] S1: Select the rock area to be measured and the measurement depth to determine the length of the semi-threaded drill pipe 1;

[0070] S2: Connect the prepared semi-threaded drill pipe 1 to the core drilling machine;

[0071] S3: Add high-temperature lubricating grease to the semi-threaded drill pipe 1 to prevent the rod from breaking due to excessive torque during coring;

[0072] S4: Start the core drilling machine, drill into the corresponding depth in the planned area, and generate multiple turns of threads at the end of the rock sample column, and the internal thread 1-1 on the half-threaded drill pipe 1 matches the thread on the rock sample column , so that the semi-threaded drill pipe 1 tightens the rock sample column;

[0073] S5: Separate the semi-threaded drill pipe 1 from the dril...

Embodiment 3

[0076] When testing with shrink-clamped drill pipe 2:

[0077] S1: Select the rock area to be measured and the measurement depth to determine the length of the contraction-clamping drill pipe 2;

[0078] S2: Connect the prepared shrink clamping drill rod 2 to the core drilling machine;

[0079] S3: Add high-temperature lubricating grease to the shrink-clamping drill pipe 2 to prevent the rod from breaking due to excessive torque during coring;

[0080] S4: Start the core drilling rig, drill into the corresponding depth in the planned area, take down the drilling rig, pour industrial alcohol or gasoline into the shrink clamping drill pipe 2 to clean the grease, and wait until the gasoline or alcohol is completely volatilized;

[0081] S5: Connect the turntable 2-3 to the hollow rotating shaft 2-1 of the drill pipe, turn the turntable 2-3, and tighten the retractable clamping drill pipe 2 through the gear structure to reduce the diameter of the shrinkable clamping drill pipe 2 ...

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Abstract

The invention discloses an in-situ testing device and method for rock tensile strength, which comprises a core drilling rig for drilling and sampling rock samples, the core drilling rig includes a drilling rig base, the top of the drilling rig base is installed with a An electric motor, the output shaft of the electric motor is connected with the input shaft of the gearbox, and both the electric motor and the gearbox are installed on a hand-operated lifting mechanism, and the said hand-operated lifting mechanism cooperates with the handle and drives it to go up and down; The output shaft of the above-mentioned gearbox is equipped with a drill rod for drilling. This device adopts retractable drill pipe and half-plane and half-helical hollow drill, combined with vacuum suction technology, under the condition that the rock sample is located on the rock wall, the tensile strength of the specified surface is measured to reduce the disturbance to the rock sample. So as to measure the rock tensile strength more accurately.

Description

technical field [0001] The invention relates to the technical field of testing methods for tensile strength of raw rock and magnetic field control, in particular to an in-situ testing device and method for tensile strength of rocks. Background technique [0002] At present, the method for testing the tensile strength of rocks is mainly to make specific rock samples, most of which are thick at both ends and thin in the middle. The purpose is to facilitate the clamping of the rock samples and stretch them to both sides. The advantage is that the operation is relatively simple; the disadvantage is that the cost of rock sample processing is too high; during the test clamping process, the force near the fixture is concentrated, the rock sample is unevenly stressed, and the rock sample will be disturbed when it is taken out. make the measured results inaccurate. Contents of the invention [0003] In view of the defects existing in the prior art, the object of the present invent...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/08G01N3/10
CPCG01N3/08G01N3/10G01N2203/0017G01N2203/0046G01N2203/005
Inventor 刘杰何卓文王瑞红张瀚成书楼何成欢李远航苏剑李洪亚唐洪宇谢晓康
Owner CHINA THREE GORGES UNIV
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