Pre-grouting reinforcement method for working face crossing through faults, and grouting device

A technology of grouting device and working face, which is applied in shaft equipment, earthwork drilling, wellbore lining, etc. It can solve problems such as roof slabs and leaky roofs, improve the gas drainage effect, reduce the weakening of rock formations, The effect of reducing brittleness

Inactive Publication Date: 2020-08-04
HUAINAN MINING IND GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a pre-grouting reinforcement method for the working face crossing a fault that can prevent the phenomenon of roof slabs and leaky roofs, so as to solve the problem that roof slabs and leaky roofs are prone to occur when the existing working face passes through faults. The problem

Method used

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  • Pre-grouting reinforcement method for working face crossing through faults, and grouting device
  • Pre-grouting reinforcement method for working face crossing through faults, and grouting device
  • Pre-grouting reinforcement method for working face crossing through faults, and grouting device

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Effect test

Embodiment 1

[0037] This embodiment discloses a pre-grouting reinforcement method for crossing a fault in a working face, which includes the following steps:

[0038] Step 1: According to the specific geological conditions of the coal mining face, adopt the The drill bit is used to pre-drill to form a pre-drilled hole, the elevation angle of the pre-drilled hole is 8°-14°, and the hole depth is 4-8m.

[0039] Step 2: Grouting the pre-drilled holes in step 1, injecting reinforcement materials to block the fissures in the surrounding rock, and stopping the grouting until the fissures in the surrounding rock return to the grout.

[0040] Specifically, due to the fracture of the shallow surrounding rock, after the reinforcement material is injected into the pre-drilled hole, under the joint action of the grouting pressure and the coal seam gas pressure, the grouting will return along the surrounding rock cracks around the pre-drilled hole, which means that the grouting reinforcement is comple...

Embodiment 2

[0050] refer to figure 1 , this embodiment also discloses a grouting device used in the pre-grouting reinforcement method for crossing faults in the working face. The grouting device includes a first grouting pipe 1, a first elastic bladder 2, a second elastic bladder 3. The second grouting pipe 4, the grouting pipe 5 and the grouting blasting valve 6. In this embodiment, the first grouting pipe 1 is an iron pipe, and the first grouting pipe 1 includes a grouting flower The pipe 11 and the grouting flowerless pipe 12, the grouting flowery pipe 11 and the grouting flowerless pipe 12 communicate to form the first grouting pipe 1, and the grouting flowery pipe 11 is far away from the end of the grouting flowerless pipe 12 The head is the grouting head of the first grouting pipe 1 , and the first elastic bag 2 and the second elastic bag 3 are sleeved on the grouting seamless pipe 12 along the axial direction of the first grouting pipe 1 .

[0051] Further, the end of the grouting...

Embodiment 3

[0058] refer to image 3 In this embodiment, on the basis of the second embodiment, a three-way air pressure burst valve 8 is also provided on the second grouting pipe 4 between the first elastic bladder 2 and the second elastic bladder 3, and the three The blasting pressure of the air pressure blasting valve 8 is lower than the blasting pressure of the pulp return blasting valve 6, ensuring that the three-way air pressure blasting valve 8 bursts first after being pressurized, so as to realize the medium-depth gap between the first elastic bladder 2 and the second elastic bladder 3. Hole or deep hole grouting, to further ensure the sealing effect, but also improve the fixation of the first grouting pipe 1, to prevent the first grouting pipe 1 received reaction force during high-pressure grouting and pop out of the deep hole or deep hole Holes, unable to achieve grouting in deep or deep holes.

[0059] Specifically, the second grouting pipe 4 is grouted externally, and the rei...

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Abstract

The invention discloses a pre-grouting reinforcement method for a working face crossing through faults. The method comprises the following steps: step 1, pre-drilling a working face top plate in a fault passing area to form a pre-drilled hole; step 2, grouting the pre-drilled hole, and injecting a reinforcing material to seal a surrounding rock crack; step 3, after the reinforcing material is completely solidified, drilling the working face top plate to form medium-deep holes; step 4, grouting and injecting a reinforcing material into the middle-deep holes through a grouting device; step 5, after the reinforcing material is completely solidified, drilling the part, between the adjacent medium-deep holes, of the working face top plate to form a deep holes; and step 6, grouting the deep holethrough the grouting device. The method has the advantages that the reinforcement of the working face top plate is realized through pre-grouting, gas can be prevented from leaking from surrounding rock crack, and the later gas extraction effect is improved; and in addition, the deep hole and the medium-deep holes are combined with a two-step grouting process, so that the phenomena of side fallingand roof leakage of the top plate when the working face crosses through the fault are prevented.

Description

technical field [0001] The invention relates to the technical field of grouting reinforcement, in particular to a pre-grouting reinforcement method and a grouting device for crossing a fault in a working face. Background technique [0002] In my country's coal mining, many working faces are inevitably arranged in coal seams with unfavorable geological conditions, some of which contain multiple fault zones. The lithological conditions in the fault structure area of ​​the coal mining face are relatively poor, which can easily cause the coal and rock mass near the fault surface to be broken and have poor stability. The fault fracture zone has a great impact on the safe mining of the working face. During the period of crossing the fault, if it is not properly controlled, it is very easy to cause coal wall fragmentation and roof drop, which may cause a decrease in mining speed and affect the production progress; Accidents such as roof casualties have caused great safety hazards ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D11/10E21B33/13E21B33/12
CPCE21B33/12E21B33/13E21D11/10
Inventor 杨庆亮邓明明
Owner HUAINAN MINING IND GRP
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