Blasting damaged rock sample preparation and micro-macro combined damage degree determination method

A technology of damage degree and measurement method, which is applied in the field of blasting damaged rock sample preparation and damage degree measurement combined with macro and mesoscopic, can solve the problems of rock dynamic damage, inability to accurately quantify blasting, etc., and achieve simple operation and comprehensive and reliable test data. Effect

Inactive Publication Date: 2015-09-30
CHINA UNIV OF MINING & TECH
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Problems solved by technology

[0005] The purpose of the present invention is to provide a simple and feasible blasting damage rock sample preparation and macro-micro-combined damage degree measurement method to solve the problem of rock dynamic damage caused by blasting that cannot be accurately quantified

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  • Blasting damaged rock sample preparation and micro-macro combined damage degree determination method
  • Blasting damaged rock sample preparation and micro-macro combined damage degree determination method
  • Blasting damaged rock sample preparation and micro-macro combined damage degree determination method

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Embodiment 1

[0032] Embodiment 1: the method for determining the degree of damage includes: preparation of blasting damaged rock samples, mesoscopic test for blasting damaged rock samples and macroscopic test for blasting damaged rock samples;

[0033] 1. The preparation of blasting damaged rock samples includes the following steps:

[0034] a. Make a rock specimen of length × width × thickness = 500mm × 500mm × 105mm, wherein the length and width are not limited to 500mm, which is equivalent to this, and a blast hole is drilled along the thickness direction at the center of the upper surface, and the aperture is ≤ 10mm. Hole depth 53mm;

[0035] b. Paste resistance strain gauges and acceleration sensors at key points on the upper surface, and connect them to the ultra-dynamic signal test analyzer through data lines;

[0036] c. Place quantitative explosives and detonators in the central borehole, seal the hole with gun mud, and use the detonator to blast;

[0037] d. Use the ultra-dynam...

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Abstract

The invention discloses blasting damaged rock sample preparation and a micro-macro combined damage degree determination method, and belongs to a determination method for a damage degree of a damaged rock sample. The micro-macro combined damage degree determination method comprises the following steps: a, manufacturing a square rock with thickness of 105mm, putting an explosive and a detonator at the geometric center of the rock, adhering resistance strain gauges and acceleration sensors at key points of the rock, and connecting the resistance strain gauges and the acceleration sensors to a super dynamic data acquisition instrument; b, drilling the rock with large blasting fragment size with the key points as circle centers along the thickness direction, polishing standard rock samples, and collecting small irregular rocks; c, performing a mercury injection test on the irregular rocks, and performing CT, nuclear magnetic resonance, longitudinal wave velocity, osmotic coefficient, elasticity modulus and uniaxial compressive strength tests on the blasting damaged standard rock samples; e, performing identical micro-macro tests on homogeneous complete rock samples; and f, based on dynamic strains and acceleration waveforms, quantitatively determining the degree of damage, caused by blasting impact, to a rock material by synthesizing micro-macro test data. The determination method has the advantages of simplicity in operation and comprehensive and reliable test data.

Description

technical field [0001] The invention relates to a method for measuring the damage degree of damaged rock samples, in particular to a method for measuring the damage degree of blasting damaged rock samples and the combination of macro and micro. Background technique [0002] The drilling and blasting method has the obvious advantages of economy, high efficiency and strong adaptability to geological conditions. It is the most commonly used technical method for rock mass excavation and is widely used in mining, water conservancy, transportation, oil and gas storage, nuclear waste treatment and other projects. While the explosive explosion blasts the rock within the excavation range, the dynamic effect of the explosion stress wave and the quasi-static effect of the explosive gas will cause dynamic disturbance and damage to the retained rock mass, resulting in deterioration of the physical and mechanical properties of the surrounding rock, strength reduction, The integrity deteri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28G01N15/08G01N23/09G01N24/08G01N29/04G01N3/08
Inventor 蔚立元张强齐燕军杨万
Owner CHINA UNIV OF MINING & TECH
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