A Determination Method for Bracket Load of Interlayer Double Key Layer Structure in Shallow Coal Seam Group

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: 2020-10-02
XIAN UNIV OF SCI & TECH
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A Determination Method for Bracket Load of Interlayer Double Key Layer Structure in Shallow Coal Seam Group
  • A Determination Method for Bracket Load of Interlayer Double Key Layer Structure in Shallow Coal Seam Group
  • A Determination Method for Bracket Load of Interlayer Double Key Layer Structure in Shallow Coal Seam Group

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0050] Example 1: 22306 working face of the supplementary tower

[0051] Bulian Tower 22306 working face mining 2 -2 Coal, coal seam inclination angle is 1-3°, buried depth is 101-253m, mining height is 6.8m, and ZY18000 / 32 / 70D type two-column shielding support is selected for working face. on top of it 1 -2 The 12307 working face of the coal is 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 periods of pressure, the average step distance of the small period is 13m, and the average working resistance of the support during the pressure period is 16900kN / frame; the average step distance of the large period is 37m, and the average working resistance of the support during the pressure period is 19700kN / frame.

example 2

[0052] Example 2: N1200 working surface of caringtiao tower

[0053] Ningtiao Tower N1200 working face mining 2 -2 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. on top of it 1 -2 The N1106 working face of the coal is mined into a goaf 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 periods of pressure, the average step distance of the small period is 12m, and the maximum working resistance of the support during the pressure period is 12515kN / frame; the average step distance of the large period 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] Ningtiaota Mine North Wing East Area 1 -2 The average thickness of coal is 1.84m, the buried depth is 110m, and the lower pa...

example

[0084] Ningtiao Tower N1200 working face mining 2 -2 Coal, with an average mining height of 5.87m and an average burial depth of 102m, located in the upper part of 1 -2 The N1106 working face of the coal has been mined into a mined-out area, with an average interlayer spacing of 39m, which belongs to the mining conditions of shallow-buried and relatively short-distance 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), we get:

[0086] P m =13810kN

[0087] According to the mining practice of the N1200 working face, the maximum working resistance of the hydraulic support of the large-cycle pressure working face is 13872kN / frame. When the working face is pressed, there is a phenomenon that the coal wall is splayed...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

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, and more particularly relates to a method for determining the support load of a double key layer structure between layers of a shallow buried coal seam group. Background technique [0002] The Shenfu mining area in western my country has abundant reserves of shallow coal seams. With the development of coal resources, the single coal seam in the upper part of the shallow coal seam has been exhausted, and most of the mines have entered the lower coal seam for mining. , threatening the safety of mine production. Shallow-buried coal seam groups with double key layer structure types between layers are common in Shenfu mining area. At present, the mining research of shallow-buried coal seam groups mainly focuses on the abnormal pressure and roof control of the working face over the overlying coal pillar. However, there are few studies on the determination of the support load of the lower coal ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & AuthorityPatents(China)
IPC IPC(8): G06F30/13G06F30/20
CPCG16Z99/00
Inventor黄庆享曹健
OwnerXIAN UNIV OF SCI & TECH