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Quantification method for newly-generated shear fissure scale in mining rock mass

A technology of shear cracks and quantitative methods, which is applied to the determination of geometric parameters of new cracks in rock bodies in rock engineering, in the field of rock mechanics theory and engineering applications, and can solve problems such as casualties, construction delays, and huge engineering construction volumes

Active Publication Date: 2020-04-14
ANSTEEL GRP MINING CO LTD
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Problems solved by technology

However, due to the relatively complex geological conditions in mainland China, engineering geological disasters such as roof caving, landslides, and water inrush accidents occur frequently during rock engineering construction, resulting in a large number of adverse consequences such as casualties, equipment losses, delays in construction schedules, and project failures; coupled with huge my country has become one of the countries in the world that suffer from serious engineering geological disasters

Method used

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  • Quantification method for newly-generated shear fissure scale in mining rock mass
  • Quantification method for newly-generated shear fissure scale in mining rock mass
  • Quantification method for newly-generated shear fissure scale in mining rock mass

Examples

Experimental program
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Effect test

Embodiment

[0176] 1. Determine the physical and mechanical parameters of the rock through laboratory experiments. The results are shown in Table 1. The experimental methods for measuring the internal friction angle and shear fracture toughness are as follows: figure 1 , 2 shown.

[0177] Table 1

[0178]

[0179] 2. Install the microseismic monitoring system on the project site, and the coordinates of the sensors are shown in Table 2.

[0180] Table 2

[0181]

[0182] 3. Use the microseismic monitoring system to collect microseismic waves induced by rock mass rupture, and manually or automatically pick up the waveforms received by the microseismic sensors ( image 3 ), using the Geiger positioning algorithm to calculate the three-dimensional space coordinates of the rupture surface based on the arrival of the waveform, extract the initial amplitude of the waveform and perform moment tensor inversion, and then calculate the normal vector of the nodal plane, the three-dimensiona...

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Abstract

The invention relates to a quantification method for a newly-generated shear fissure scale in a mining rock mass, thereby solving a problem that the quantification result of a small-scale fissure (meter-scale) is too large because surface energy consumed by a newly-generated fissure is not considered in a widely-adopted Brune model. On the basis of simulating and calculating the spatial distribution of a stress field in the rock engineering excavation process, a normal vector of a fracture surface is determined by combining a moment tensor inversion method, so that the purpose of more reasonably determining the newly-generated shear fissure scale in a mining rock mass is achieved. According to an actual excavation based process, the dynamic evolution process of a stress field in the miningrock mass and a corresponding stress state when a fracture surface is generated are reproduced by combining numerical simulation and a dynamic equation is established to solve the fissure scale by taking the result as a known condition, so that the dynamic characteristics of fissure growth in the rock mass fracture process are better met and basic data can be provided for quantifying the rock mass damage degree by utilizing a micro-seismic monitoring method.

Description

technical field [0001] The invention belongs to the technical field of rock mechanics theory and engineering application, mainly relates to the technical field of determining the geometric parameters of new cracks in rock bodies in rock engineering, and specifically relates to a method for quantifying the size of new shear cracks inside mined rock mass. Background technique [0002] The rapid growth of my country's economy has greatly stimulated the development of resources and energy, most of which involve rock engineering, such as coal mining, metal and non-metal mining, tunnel digging in the process of building roads and railways, and rock engineering in the process of building water conservancy. Quality slope excavation and so on. However, due to the relatively complex geological conditions in mainland China, engineering geological disasters such as roof caving, landslides, and water inrush accidents occur frequently during rock engineering construction, resulting in a la...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/24
CPCG01N33/24
Inventor 解治宇徐连生张鹏海孙健姚强
Owner ANSTEEL GRP MINING CO LTD
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