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Coal mine earthquake risk assessment method

A risk assessment and mining earthquake technology, applied in mining equipment, earth square drilling, mining equipment, etc., can solve problems such as rock burst disasters, surface building damage, and prominent risks of mine earthquake disasters, so as to ensure safe production and eliminate Effects of rock burst disaster and reduction of mine earthquake risk

Active Publication Date: 2022-03-01
CHINA UNIV OF MINING & TECH +1
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Problems solved by technology

[0003] In addition to the possibility of rock burst disasters caused by mining earthquakes, frequent mine earthquakes will also have an adverse effect on the health of underground workers. In addition, in the mining process of some shallow-buried deep mines, mine earthquakes that occur underground may also cause surface damage. Some strong mining earthquakes even caused damage to surface structures, and the risk of disasters caused by mining earthquakes has become increasingly prominent

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  • Coal mine earthquake risk assessment method
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Embodiment Construction

[0038] The buried depth of the working face of a certain mine is about 380m, the inclined length is 255m, and the advancing length is 1256m. figure 2 As shown, the top-coal caving mining is adopted, the mining height is 27m, the uniaxial compressive strength of the roof rock is 22.8MPa, the uniaxial tensile strength is 3MPa, and the elastic modulus is 9GPa. It is necessary to assess the risk of mine earthquakes during the advancement of this working face.

[0039] Table 1 Columnar drilling in a working face

[0040] Layer number lithology Burial depth of rock floor (m) Rock thickness h(m) Distance from coal seam d(m) / 6 coal bottom 519.19 / / / 6 Coal Tops 492.19 27.00 / 1 gritstone 487.89 4.10 4.30 2 gritstone 475.57 6.60 16.62 3 gritstone 459.82 7.24 32.37 4 gritstone 444.45 25.41 47.74 5 gritstone 412.42 5.14 79.77 6 fine sandstone 387.55 21.28 104.64 7 gritstone 366.27 17.30...

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Abstract

The invention relates to the field of mine earthquake risk assessment in a coal mining process, in particular to a method for assessing mine earthquake risk caused by overlying strata key layer fracture in the coal mining process, which comprises the following steps of: calculating theoretical fracture step pitch and released energy of a key layer; evaluating whether the key layer can be broken or not; the mine earthquake intensity caused by key layer fracture is evaluated; evaluating the potential influence of mine earthquakes on the earth surface; and evaluating the potential influence of the mine earthquake on the underground. According to the method, a technical means for scientifically evaluating the mine earthquake risk is provided for a mine, the mine earthquake risk source and the risk level can be effectively identified, then mine earthquake disaster prevention and control measures are formulated in a targeted mode, the mine earthquake risk is reduced to the maximum extent, rock burst disasters induced by mine earthquakes are weakened or even eliminated, and safe production of the mine is guaranteed.

Description

technical field [0001] The invention relates to the field of mine earthquake risk assessment in the coal mining process, in particular to an assessment method for assessing the mine earthquake risk caused by the breakage of a key layer of overlying rock in the coal mine mining process. Background technique [0002] Coal is an important guarantee for my country's energy security. Rockburst disasters will instantly destroy shaft equipment, cause casualties, and induce secondary disasters such as outbursts and gas explosions. It is one of the most serious disasters in coal mines. As of 2020, there are 123 high-risk rock burst mines in my country, and the production capacity of such mines accounts for more than 10% of my country's total coal production capacity. As the depth of coal mining increases, the situation of rock burst disasters will become more severe. Prevention and control of rock burst is a worldwide problem that needs to be solved urgently. Mining earthquake is a...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21F17/18E21F17/00
CPCE21F17/18E21F17/00
Inventor 曹安业李振雷窦林名宋大钊王桂峰何学秋巩思园彭雨杰
Owner CHINA UNIV OF MINING & TECH
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