Coal and gas outburst forecasting method

A gas outburst and coal-rock mass technology, which is applied in the field of coal and gas outburst prediction, can solve the problems of large influence of human factors and influence on coal and gas prediction results, and achieve the effect of reducing engineering costs and easy operation

Inactive Publication Date: 2010-07-28
INST OF MECHANICS - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] The existing coal and gas outburst forecasts are all based on the analysis of parameters such as gas desorption amount and coal firmness coefficient, and judge the gas outburst bas...

Method used

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  • Coal and gas outburst forecasting method
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  • Coal and gas outburst forecasting method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Embodiment 1: Steps for judging whether Jieshimen protrudes

[0063] (1) Establish the geometric model of Jieshimen, the model and dimensions are as follows image 3 shown.

[0064] (2) The material parameters of the given coal seam and rock formation.

[0065] The average elastic modulus of coal mass E=1.0×10 9 Pa, minimum elastic modulus of coal body E=1.0×10 8 Pa

[0066] Rock elastic modulus mean E=1.0×10 10 Pa, minimum value of elastic modulus of rock E=1.0×10 9 Pa

[0067] Tensile strength mean σ t =0.6×10 6 Pa, minimum tensile strength σ t =0.6×10 5 Pa,

[0068] Average shear strength σ t =2.0×10 7 Pa, the minimum shear strength σ t =2.0×10 6 Pa

[0069] Inhomogeneity coefficient of elastic modulus and strength m=10

[0070] Coal Poisson's ratio v=0.25, rock Poisson's ratio v=0.25

[0071] permeability coefficient k 0 =7.62×10 -15 m 2 ,

[0072] Gas density ρ a =0.8kg / m 3 .

[0073] (3) Given the initial value and boundary conditions.

...

Embodiment 2

[0077] Embodiment 2: Steps for judging whether the blasting tunneling of the coal roadway is outburst

[0078] The difference between blasting tunneling in coal lanes and unraveling stone gates is that coal and gas outbursts are different in calculation parameters and initial boundary conditions, and the rest are the same as in implementation 1.

[0079] The calculation parameters of the numerical simulation of blasting tunneling in coal roadway are:

[0080] The average elastic modulus of coal mass E=1.0×10 9 Pa, minimum elastic modulus of coal body E=1.0×10 8 Pa

[0081] Rock elastic modulus mean E=1.0×10 10 Pa, minimum value of elastic modulus of rock E=1.0×10 9 Pa

[0082] Tensile strength mean σ t =0.8×10 6 Pa, minimum tensile strength σ t =0.8×10 5 Pa,

[0083] Average shear strength σ t =3.0×10 7 Pa, the minimum shear strength σ t =3.0×10 6 Pa

[0084] Inhomogeneity coefficient of elastic modulus and strength m=10, permeability coefficient k 0 =7.62×10 ...

Embodiment 3

[0088] Example 3: One-dimensional gas outburst and constant advancement

[0089] During the period from 1985 to 1996, the Institute of Mechanics of the Chinese Academy of Sciences made a large number of one-dimensional coal and gas outburst simulation experimental devices such as Figure 6 Shown, understand the basic phenomenon of coal and gas outburst. In the experiment, the coal sample was pressed into a round tube, and the round tube was separated into a high-pressure gas area and an ordinary atmospheric pressure area by aluminum foil. When the aluminum foil is broken, observe the protrusion of the coal sample.

[0090] The difference between this embodiment and Embodiment 1 lies in that the established geometric model, calculation parameters, and initial and boundary conditions are different, and the rest of the steps are the same as in Embodiment 1.

[0091] The geometric model for the numerical simulation of one-dimensional gas outburst constant propulsion is as follow...

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Abstract

The invention discloses a coal and gas outburst forecasting method which comprises the following steps that: (1) a geometric model is built; (2) material parameters, initial values and boundary conditions of an area to be tested are given; (3) a theoretical model is built; (4) the material parameters, the initial values and the boundary conditions are substituted into the theoretical model to calculate the coal and gas outbursts in the area to be tested; (5) the coal and gas outbursts calculated in step (4) is marked to generate a cloud atlas; and (6) according to the number of the coal and gas outburst marks of the area to be tested in the cloud atlas, whether the area has coal and gas outbursts is judged. The coal and gas outburst forecasting method of the invention first builds the theoretical model for judging the outbursts, and then adopts a finite element technique to calculate, to realize the forecasting of the coal and gas outbursts. The forecasting method of the invention is based on the complete theoretical model, realizes the coal and gas outburst forecasting by numerical calculation, is easy to operate in actual situations, and can greatly reduce the engineering cost.

Description

technical field [0001] The invention relates to a method for predicting coal and gas outburst. Background technique [0002] Coal and gas outbursts are one of the most serious industrial disasters in coal mines, with high frequency and many casualties. my country's high-gas and coal and gas outburst mines account for more than 50%, and it is one of the countries with the most serious coal and gas outburst in the world. The cumulative number of outbursts accounts for about 40% of the world's total outbursts. The above situation shows that the research and realization of coal and gas outburst forecast is of great significance to ensure the safety of coal mine production, especially the life safety of miners. [0003] Existing forecasts of coal and gas outburst are based on the analysis of parameters such as gas desorption amount and coal firmness coefficient, and judge the gas outburst based on engineering experience. The influence of each parameter of gas outburst on the ac...

Claims

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Application Information

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IPC IPC(8): E21F17/18E21F7/00
Inventor 陈力乔继延丁雁生李德聪
Owner INST OF MECHANICS - CHINESE ACAD OF SCI
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