Method utilizing nail shooting to measure rock cohesion C and internal friction angle (Phi)

A technology of rock cohesion and internal friction angle, which is applied in measuring devices, mechanical devices, instruments, etc., can solve the problems of a large amount of manpower and material resources, cumbersome and complicated test samples, and achieve the effect of improving the reliability of measurement

Inactive Publication Date: 2015-10-21
CHINA THREE GORGES UNIV
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  • Claims
  • Application Information

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Problems solved by technology

[0005] Rock cohesion C and internal friction angle in prior art Obtaining the existing shortcomings needs to be determined by rock direct shear test, uniaxial compression test or triaxial compression test, etc.
The acquisition of test samples requires a lot of manpower and material resources, and is relatively cumbersome

Method used

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  • Method utilizing nail shooting to measure rock cohesion C and internal friction angle (Phi)
  • Method utilizing nail shooting to measure rock cohesion C and internal friction angle (Phi)

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Embodiment Construction

[0022] A Method of Measuring Rock Cohesion C and Internal Friction Angle by Shooting Nails method, including the following steps:

[0023] Step 1: The air compressor generates high-pressure gas, and the high-pressure gas is transmitted to the nail gun through the exhaust pipe. The nail gun shoots the steel row nails into the rock mass through the pressure generated by the high-pressure gas.

[0024] Step 2: Use a steel ruler to measure the length of the steel row nail penetrating into the rock; the rock is soft rock or sandstone with a certain degree of weathering.

[0025] Step 3: Calculate the rock cohesion C and internal friction angle according to the linear Mohr strength envelope

[0026] In the step 1, the pressure of the high-pressure gas in the air compressor decreases in proportion to the increase in the number of times of nailing.

[0027] In step 1, the muzzle of the nail gun is perpendicular to the rock mass.

[0028] In the step 3, for a rock block, the midd...

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Abstract

The invention discloses a method utilizing nail shooting to measure the rock cohesion C and internal friction angle (Phi). The method comprises the following steps: (1) generating high pressure gas by an air compressor, introducing the high pressure gas into a nail shooting gun through an exhaust pipe, and shooting steel arranging nails into a rock under the pressure of the high pressure gas; (2) measuring the length of steel arranging nails in the rock by a steel ruler; (3) according to the linear molar strength envelope line, calculating the rock cohesion C and internal friction angle (Phi). In the provided method, a nail shooting gun shoots steel arranging nails into a rock, then the length of the steel arranging nails in the rock is measured, and finally relationship among the length, the rock cohesion C and internal friction angle (Phi) is established. The method has the advantages of reliability, simple structure, and convenient operation.

Description

technical field [0001] The present invention uses nails to measure rock cohesion C and internal friction angle The method relates to the field of rock exploration and experimentation. Background technique [0002] There is a mature air impact nailer, which uses the air compressor to generate air pressure as power, transmits it to the nail gun through the exhaust pipe, and uses this thrust to drive the nail into the building body; after the nail is completed It can be used directly again. [0003] Two shear strength parameters are often used in rock slope design and calculation: cohesion C, internal friction angle At present, the usual method is to determine through rock direct shear test, uniaxial compression test or triaxial compression test. [0004] Make the corresponding cylindrical specimen, and limit the compressive stress on one side (σ 2 = σ 3 ), gradually apply axial pressure to the specimen until the specimen is fractured, and record the axial compressive st...

Claims

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Application Information

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IPC IPC(8): G01N19/02G01N19/04
Inventor 刘杰李春波胡安龙常德龙王哲
Owner CHINA THREE GORGES UNIV
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