Method for testing dynamic strain in protolith

A technology of dynamic strain and testing method, applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems of lack of basic research results, unclear induction mechanism, neglect of three-dimensional high ground stress state, etc., to ensure authenticity and reliability The effect of reducing the error of strain measurement

Pending Publication Date: 2021-12-31
LIAONING TECHNICAL UNIVERSITY
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Problems solved by technology

[0003] At present, in the research on the induction mechanism of deep rock mass failure and instability under three-dimensional high stress, the induction mechanism of blasting impact on deep rock mass disasters is still unclear, and there is a serious lack of basic research results
At present, in the laboratory rock mechanics tests aimed at the critical fracture and dynamic instability of deep rock mass, the rock high strain rate impact test based on the separated Hopkinson pressure bar technology (SHPB) is generally used, but the real rock is ignored in the test. The factor of the three-dimensional high ground stress state in the environment leads to a large difference between the obtained test data and the actual situation, and the reduction factor can only be obtained from experience to reduce the error as much as possible

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  • Method for testing dynamic strain in protolith
  • Method for testing dynamic strain in protolith
  • Method for testing dynamic strain in protolith

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Embodiment Construction

[0024] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0025] A method for testing dynamic strain inside a proto-rock, comprising the steps of:

[0026] Step 1: Prepare the measuring hole 2 in the area of ​​the explosion shock wave centered on the blasting hole 1; in this embodiment, the distance between the measuring hole 2 and the blasting hole 1 is 10m, the diameter of the measuring hole 2 is 200mm, and the The depth is 2000mm;

[0027] Step 2: Prepare a set of molds with cuboid cavity, pour mortar into the mold, and prepare test block 3 for simulating the physical properties of the original rock; an embedded steel pipe 6 is embedded in the prepared test block 3, and the inner The embedded steel pipe 6 is perpendicular to the upper surface and the lower surface of the test block 3, the upper end of the embedded steel pipe 6 extends out of the upper surface of the test block 3, the low...

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Abstract

The invention relates to a method for testing dynamic strain in protolith, which comprises the following steps of: preparing a measuring hole in an explosive shock wave action area taking a blast hole as a center; preparing a set of mold with a cube-shaped cavity, pouring mortar into the mold, and preparing a test block for simulating physical properties of protolith; pasting a strain gauge on the surface of the prepared test block; preparing a super-dynamic strain tester and a computer, connecting the strain gauges on the surface of the test block with the super-dynamic strain tester through wires, and connecting the super-dynamic strain tester with the computer; feeding the test block into a specified position in the measuring hole and fixing the test block; and controlling the detonators in the blast holes to detonate, collecting data measured by the strain gauges by the super-dynamic strain tester after explosive shock waves pass through the measuring holes, analyzing the collected data by the computer, and automatically calculating stress data. According to the method, the protolith environment and the protolith structure are reserved, the three-way high ground stress field is maintained, the strain measurement error is small, and data are real and reliable.

Description

technical field [0001] The invention belongs to the technical field of rock mechanics testing, in particular to a method for testing dynamic strain inside original rock. Background technique [0002] Deep rock mass is the carrier of deep water conservancy and hydropower projects, deep metal mining, and high-level radioactive nuclear waste disposal. When deep rock mass is excavated, it will be disturbed by blasting and destructive impact, which will often induce a series of damage. The essence of instability and even geological disasters is the critical rupture and dynamic instability of deep rock mass damaged by excavation and unloading under the three-dimensional high ground stress state under the action of blasting shock waves. [0003] At present, in the research on the induction mechanism of deep rock mass failure and instability under three-dimensional high stress, the induction mechanism of blasting impact on deep rock mass disasters is still unclear, and there is a se...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/313
CPCG01N3/313G01N2203/0075G01N2203/0617G01N2203/0676G01N2203/0682
Inventor 费鸿禄左壮壮包士杰甄帅李文焱聂寒张志强山杰
Owner LIAONING TECHNICAL UNIVERSITY
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