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A treatment method for the undercut of coal mine level roadway

A technology of level entry and bottom sill, which is applied in mining equipment, earthwork drilling, wellbore lining, etc. It can solve problems such as difficult engineering, heavy workload, and deformation of surrounding rock, so as to improve the overall bearing capacity, rock strength, The effect of preventing water accumulation again

Inactive Publication Date: 2016-08-24
ANHUI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, undercuts lead to twisting and deformation of the track, ups and downs, rollover accidents, and suspension of roadway operations; serious
Although undercover can alleviate temporary needs, undercover projects not only have a heavy workload, but also are very difficult, and often the progress of the project is slow, seriously affecting production

Method used

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  • A treatment method for the undercut of coal mine level roadway

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Such as figure 1 Shown, a kind of treatment method of the bottom of coal mine level roadway, comprises the following steps:

[0025] (a) Water plugging: First, two rows of grouting holes 1 are respectively set in the floor rock formations at both ends of a horizontal roadway 4 with a length of 100-150 m. The number of grouting holes 1 is 2, and each row of adjacent grouting holes 1 is arranged at equal intervals along the width of the bottom plate. The depth of grouting holes 1 is 4.5m to 6m; The grouting time of hole 1 is to keep for 10 minutes after reaching the grouting pressure. The grouting sequence: first the middle, then both sides, first the inner side, then the outer side. The grouting pressure is 2-3MPa. 0.7;

[0026] (b) water pumping: after the water blocking operation in step (a) is completed for 24 hours, the water collection hole 2 is arranged in the bottom plate rock layer in the middle of the horizontal roadway 4, and the hole depth of the water colle...

Embodiment 2

[0029] The difference from Example 1 is: the water plugging described in step (a), the grouting time of each grouting hole 1 is kept for 5 minutes after reaching the grouting pressure; the hole depth of the water collection hole 2 in the step (b) 7m and a diameter of 100mm; the distance between adjacent filling grouting holes 3 in step (c) is 20m, the grouting pressure is 2MPa, and the hole sealing length is 1.5m.

Embodiment 3

[0031] The difference from Example 1 is: the water plugging described in step (a), the grouting time of each grouting hole 1 is kept for 15 minutes after reaching the grouting pressure; the hole depth of the water collection hole 2 in step (b) 7m and a diameter of 120mm.

[0032] The so-called water blocking is to set grouting holes at both ends of a horizontal roadway with a length of L and implement grouting (the length of L is determined according to the on-site production permission, usually 100-150m), the purpose is to cut off the horizontal roadway of this section and connect with both sides Water conservancy connection of roadway. Adopt the control method of the bottom of the coal mine level roadway described in the present invention, at first carry out water blocking, the purpose is to cut off the water conservancy connection of this section roadway and the roadway connected on both sides, after grouting, the water conservancy between this section horizontal roadway an...

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PUM

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Abstract

The invention provides a treatment method for colliery roadway floor heaves. The treatment method includes the steps of a), for water plugging, arranging a plurality of grouting holes in a floor strata at two ends of a horizontal roadway, wherein the grouting holes are 4.5m-6m in depth, and then performing grouting on the grouting holes with a grouting pump, wherein time for grouting of each grouting hole is 5-15 minutes; b), for water pumping, after water plugging, arranging water collecting holes in the floor strata in the middle of the horizontal roadway, and after arrangement of the collecting holes, performing water pumping for several times on the floor strata through the water collecting holes till bottoms of the water collecting holes are free of accumulated water; c), for grouting filling, arranging a plurality filling grouting holes in the floor strata of the horizontal roadway along the axial direction of the roadway, and after filling grouting hole arrangement, setting grouting pipes, and performing grouting on the grouting holes with the grouting pump, wherein grouting pressure ranges from 2MPa to 3MPa, and time for grouting stops till grout spills over the neighboring grouting holes. With the treatment method, the roadway floor heaves can be effectively treated, and the treatment method is simple in process and low in cost.

Description

technical field [0001] The invention relates to the treatment of the bottom of the coal mine soft rock roadway, in particular to a treatment method for the bottom of the coal mine level roadway. Background technique [0002] For a long time, bottom swell has been a major chronic problem in soft rock roadways in coal mines. The reason why it is called a persistent problem is that people have been helpless about it. Only when it has bulged to a certain extent, it can be dug out with a pick called undercover. On the one hand, undercuts lead to twisting and deformation of the track, ups and downs, rollover accidents, and suspension of roadway operations; serious. Although undercover can relieve temporary needs, undercover projects not only have a heavy workload, but also are very difficult, and often the progress of the project is slow, which seriously affects production. [0003] There are usually two reasons for the undercut. One is the ground pressure. The greater the grou...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D11/10E21D11/38
CPCE21D11/10E21D11/38E21F16/00
Inventor 薛维培经纬经来旺姚直书
Owner ANHUI UNIV OF SCI & TECH