Method for determining structural support load of double key layers between coal seam group layers

A determination method and key layer technology are applied in the field of determination of the support load of the double key layer structure between the layers of the shallow buried coal seam group. The effect of mining

Active Publication Date: 2017-10-10
XIAN UNIV OF SCI & TECH
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  • Application Information

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Problems solved by technology

[0016] The embodiment of the present invention provides a method for determining the support load of the interlayer double key layer structure of the shallow coal seam group, which is used to solve the problem that there is no systematic analysis of the mine pressure characteristics and the roof structure of the coal seam working face under the shallow coal seam group in the prior art. Determination of the support load of the lower coal seam working face that cannot be applied to the interlayer double key layer structure of the shallow coal seam group

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  • Method for determining structural support load of double key layers between coal seam group layers
  • Method for determining structural support load of double key layers between coal seam group layers
  • Method for determining structural support load of double key layers between coal seam group layers

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Effect test

example 1

[0050] Example 1: 22306 Working Face of Bulian Tower

[0051] Bulian Tower 22306 Working Face Mining 2 -2 Coal, coal seam inclination angle 1-3°, buried depth 101-253m, mining height 6.8m, ZY18000 / 32 / 70D type two-column shield support is used for the working face. located in its upper part 1 -2 Coal working face 12307 has been mined into a goaf, with a mining height of 5.4m, a coal seam spacing of 28-35m, and a double key layer structure between layers. The 22306 working face has large and small cycles of pressure, the average step distance of the small period of pressure is 13m, and the average working resistance of the support during the pressure is 16900kN / frame; the average step distance of the large period of pressure is 37m, and the average working resistance of the support during the pressure is 19700kN / frame.

example 2

[0052] Example 2: Caragana tower N1200 working face

[0053] Mining at N1200 working face of Ningtiao Tower 2 -2 For coal, the dip angle of the coal seam is less than 1°, the buried depth is 67-151m, and the mining height is 5.87m. The working face adopts ZY12000 / 28 / 63D two-column shield support. located in its upper part 1 -2 The coal N1106 working face is mined into a goaf after mining, with a mining height of 1.72m, an average coal seam spacing of 39m, and a double key layer structure between layers. The N1200 working face has large and small cycles of pressure, the average step distance of the small cycle is 12m, and the maximum working resistance of the support during the pressure period is 12515kN / frame; the average step distance of the large cycle pressure is 24m, and the maximum working resistance of the support during the pressure period is 13872kN / frame.

[0054] Among them, the physical similarity simulation is as follows:

[0055] East Zone 1, North Wing, Ningti...

example

[0084] Mining at N1200 working face of Ningtiao Tower 2 -2 Coal, with an average mining height of 5.87m and an average buried depth of 102m, is located in the upper 1 -2 The coal N1106 working face has been mined into a goaf, with an average layer spacing of 39m, which belongs to the mining conditions of shallow buried coal seams with double key layer structure between layers. The calculation parameters are selected as follows: μ=0.9, b=1.75m; l k =5.0m; Σh=5.9m; ρ 1 g=22kN / m 3 ; h=12m; α=60°; L 1 =12m; m 2 =5.87m; h 1 =2.0m; ρg=25kN / m 3 ; L 2 =24m; h 2 =18m;K G = 0.4; h 3 = 0.8m.

[0085] According to formula (111):

[0086] P m =13810kN

[0087] According to the mining practice of the N1200 working face, the maximum working resistance of the hydraulic support on the working face is up to 13872kN / frame when it is pressed in a large cycle. The shielding support with a rated working resistance of 12000kN / frame cannot meet the requirement of compressive strength...

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Abstract

The invention discloses a method for determining the structural support load of double key layers between coal seam group layers and relates to the technical field of coal seam mining. The method comprises the steps that according to the large support load characteristic in the ground pressure characteristics of working faces of the double critical layers between the coal seam group layers during great periodic pressure, a great periodic pressure working face roof structure model is built; according to the great periodic pressure working face roof structure model, it is determined that the support load is the sum of the load applied by the immediate roof weight and the load applied by a ramp step rock beam structure on the lower key layer; according to the support load and the supporting efficiency, the support load of the double-key-layer structure between the coal seam group layers is determined. According to the determined method, on the basis of the actual ground pressure measurement and the physical similar simulation, the obvious characteristics of the ground pressure of the working surfaces are obtained, the structure model of the double key layers between the coal seam group layers is built, the determining method of the support load is provided, and a basis can be provided for determining the support load of the working faces under such condictions.

Description

technical field [0001] The invention relates to the technical field of coal seam mining, in particular to a method for determining the support load of a double key layer structure between layers of a shallow coal seam group. Background technique [0002] The shallow-buried coal seam group in the Shenfu mining area in western my country is rich in reserves. With the development of coal resources, the single coal seam in the upper part of the shallow coal seam has been mined, and most mines have entered the lower coal seam for mining. There are dynamic pressure disasters in the working face, causing accidents such as crushing , Threatening safe production in mining areas. Shallow coal seam groups with double key layer structures between layers are relatively common in the Shenfu mining area. At present, the mining research on shallow coal seam groups mainly focuses on the abnormal pressure and roof control of the working face passing through the overlying coal pillars. However...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
CPCG16Z99/00
Inventor 黄庆享曹健
Owner XIAN UNIV OF SCI & TECH
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