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Impact instability judgment and anti-impact mining method for asymmetric island working face

A discrimination method and technology of working face, applied in ground mining, mining equipment, mining equipment, etc., can solve problems such as difficult prediction and prevention of coal impact instability, complex structure of overburden in goaf, etc., to reduce impact risk, Optimize the width and ensure the effect of safe mining

Active Publication Date: 2021-06-04
ANHUI UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since there are many factors affecting the impact instability of the coal body in the island working face, the stress concentration degree of the coal body in different island working faces and the movement characteristics of the spatial structure of the overlying strata need to be analyzed in detail. In the asymmetric special island working face, the structure of the overlying strata in the goaf is complex, and the prediction and prevention of coal impact instability are more difficult

Method used

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  • Impact instability judgment and anti-impact mining method for asymmetric island working face
  • Impact instability judgment and anti-impact mining method for asymmetric island working face
  • Impact instability judgment and anti-impact mining method for asymmetric island working face

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] This example illustrates the engineering background and structural features of the research object.

[0072] 1. Engineering background

[0073] 1. Geological overview of the mining area

[0074] The average mining depth of the main mining area of ​​a certain coal mine in Shandong is about 500m. The mining area generally has a monocline structure. The rock formation strikes at about 40°, dips at about 330°, and dips at 10°-16°, generally about 11°. The occurrence is relatively stable. The coal seam 3 in the middle part of the Lower Permian Shanxi Formation and the Upper Carboniferous Taiyuan Group, which are mainly mined, has stable sedimentation and can be mined in the entire mining area. The maximum thickness of the coal seam is 6.71m, the minimum thickness is 1.14m, and the average reaches 4.38m. 60% of the drilled holes saw a coal thickness of about 5.4m, and a coal seam bulk density of 1.35kN / m 3 , the structure of the coal seam is simple, only a layer of gangue i...

Embodiment 2

[0088] This example illustrates the estimation of the support pressure of the island working face in Example 1.

[0089] The actual bearing pressure distribution characteristics of the isolated island working face are closely related to factors such as the thickness of the coal seam, the physical and mechanical parameters of the coal body, the degree of stress concentration, and the width of the working face. The calculation method is relatively complicated. In order to simplify the calculation, it is assumed that the gravity of the overlying strata borne by the working face acts on the coal body on average, and the support pressure of the working face on the island is distributed in a straight line, as shown in Figure 5 shown.

[0090] 1. Establishing the average static bearing pressure model of the island working face

[0091] The static stress of the isolated island working face comes from the superposition of the gravity and transfer stress of the overlying strata. Accor...

Embodiment 3

[0135] This embodiment illustrates the method for judging the impact instability of the island working face.

[0136] According to the content of embodiment 2 and the formula (13), the relationship of "equivalent mining depth-damage degree-average support pressure" is established, see Figure 8 . Such as Figure 8 As shown, the average bearing pressure on the working face When , the working face has the condition of local impact, and the equivalent mining depth of the corresponding working face at this time is The overall damage degree of the working face U=0.375; the average bearing pressure on the working face When the working face meets the conditions of overall instability, the equivalent mining depth of the corresponding working face is The overall damage degree of the working face is U=1.0. That is, there is no risk of impact on the working face of U1.0. Based on this, the "equivalent mining depth" of the isolated island working face was preliminarily establish...

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Abstract

The invention provides an impact instability judgment method for an asymmetric island working face. The impact instability judgment method comprises the following steps of (S1) obtaining the spatial distribution characteristics of overlying strata of the working face, and revealing the control influence of conglomerate on the movement of the overlying strata on the working face through a micro-seismic monitoring result; (S2) dividing the earth surface into three types of areas, analyzing stress transfer rules of overlying strata in different areas to the island working face, and establishing an average bearing pressure estimation model; and (S3) establishing a relation among the equivalent mining depth, the damage degree of the working face and the average bearing pressure of the working face, and judging the possibility of impact instability of the working face according to the relation. The invention further provides an anti-impact mining method for the asymmetric island working face. According to the method, the asymmetric island working face in the condition of the huge thick conglomerate is used as a research object, and the relation among the equivalent mining depth, the damage degree of the working face and the average bearing pressure is put forward and is used as the basis for judging the danger degree of the working face, so that safe mining of the working face is effectively guaranteed.

Description

technical field [0001] The invention relates to the technical field of coal mining, in particular to an impact instability discrimination and scour prevention mining method of an asymmetric island working face. Background technique [0002] The space structure of the overlying rock in the island working face is complex, and the concentration of mining stress is high, which can easily cause dangers such as rock burst. The instability of coal mass impact and the dynamic disasters induced by it have gradually become a difficult problem restricting mine safety production. Carrying out the research on the pre-mining impact instability of the island working face is the key to the prediction and prevention of rock burst hazards. [0003] At present, domestic experts have conducted research on the structural characteristics of the overlying strata, the distribution of stress, and the assessment of impact hazards on the working face of the island, and have achieved fruitful results. ...

Claims

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Application Information

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IPC IPC(8): E21C41/18E21F17/18E21B47/00
CPCE21C41/18E21F17/18E21B47/00
Inventor 张明焦正华袁安营胡学龙
Owner ANHUI UNIV OF SCI & TECH
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