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A method for quantifying the size of new shear cracks in mined rock mass

A technology of shear crack and quantification method, which is applied to the determination of geometric parameters of new cracks in rock body in rock engineering, rock mechanics theory and engineering application fields, and can solve problems such as engineering failure, delay in construction period, casualties and other problems

Active Publication Date: 2022-04-15
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 suffers from serious engineering geological disasters

Method used

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  • A method for quantifying the size of new shear cracks in mined rock mass
  • A method for quantifying the size of new shear cracks in mined rock mass
  • A method for quantifying the size of new shear cracks in mined rock mass

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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 method for quantifying the size of new shear cracks inside a mined rock mass, which overcomes the problem that the widely used Brune model does not consider the consumption of surface energy by new cracks, resulting in too large quantitative results for small-scale cracks (meter level). On the basis of simulating and calculating the spatial distribution of the stress field in the rock engineering excavation process, the normal vector of the fracture surface is determined by combining the moment tensor inversion method, so as to achieve a more reasonable determination of the scale of new shear cracks in the mined rock mass Purpose. Based on the actual excavation process, combined with numerical simulation to reproduce the dynamic evolution process of the stress field in the mined rock mass and the corresponding stress state when the fracture surface is generated, and use this as a known condition to establish a dynamic equation to solve the crack scale, which is more in line with the rock mass The dynamic characteristics of crack growth during the rupture process can provide basic data for quantifying the damage degree of rock mass using microseismic monitoring methods.

Description

technical field [0001] The invention belongs to the technical field of rock mechanics theory and engineering application, and mainly relates to the technical field of determining the geometric parameters of new cracks in rock bodies in rock engineering, in particular to a method for quantifying the size of new shear cracks inside mining 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 large nu...

Claims

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Application Information

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Patent Type & Authority Patents(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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