A kind of pre-grouting reinforcement method for the fault structure zone of the working face

A technology for working faces and structural zones, which is applied in earthwork drilling, wellbore/well components, sealing/isolation, etc., and can solve the problems of high cost of shallow hole chemical grouting reinforcement, short distance of pillar support and top control, and grouting problems. Problems such as short distance to solve passive and hysteresis construction problems, obvious effect of roof control and high safety

Active Publication Date: 2022-04-08
HUAINAN MINING IND GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above methods have the following problems in the fault treatment process: 1. The distance of pillar support to control the roof is short, and the broken surrounding rock cannot be reinforced, and the construction effect and safety are poor
2. The cost of shallow hole chemical grouting reinforcement is high, and the grouting distance is short and the reinforcement range is small. It is mainly aimed at 5-10m shallow surrounding rocks, and cannot achieve the purpose of large-scale overall reinforcement of the fault fracture zone.
3. The above-mentioned methods are all partial and lagging passive methods for fault management, and cannot achieve advanced and pre-treatment of faults.
4. The above method requires to be carried out when the working face is stopped, which seriously affects the per unit yield of the working face and cannot guarantee the continuous advancement of the working face

Method used

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  • A kind of pre-grouting reinforcement method for the fault structure zone of the working face
  • A kind of pre-grouting reinforcement method for the fault structure zone of the working face
  • A kind of pre-grouting reinforcement method for the fault structure zone of the working face

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Effect test

Embodiment 1

[0040] The specific operation steps of the pre-grouting reinforcement of the 11123 working face of the Pan No. 2 Mine (directional holes are arranged in parallel with the grooved roadway) are as follows:

[0041] A four-step progressive grouting scheme combining curtain holes, shallow holes, deep holes and reserved holes is adopted in the upper groove of the 11123 working face; , hole sealing, grouting sequence of shallow hole, deep hole, reserved hole "step-by-step" grouting process.

[0042] (1) Curtain grouting

[0043] see figure 1 When the 11123 working face is 300~400m away from the edge of the fault structural belt 1, the upper part of the working face along the upper groove of the fault structural belt 1 within the range of 150 m in length and 70 m in width shall be constructed from right to left in the same direction as the advancing direction of the working face. Curtain grouting holes 2 in parallel rows are arranged in a staggered and crossed arrangement. Each hol...

Embodiment 2

[0051] The specific operation steps of Zhangji Mine 1613 (3) working face fault structural belt pre-grouting reinforcement (directional hole drilling field fan-shaped centralized arrangement) are as follows:

[0052] see Figure 5 , in the drilling field 6, by adjusting the angle and length of the drilling holes one by one to complete the centralized arrangement of fan-shaped directional holes, and complete the drilling of curtain holes, shallow holes, deep holes, reserved holes, pipe down, sealing and step-by-step progress. grouting.

[0053] (1) Curtain grouting

[0054] see Figure 5 , in the upper and lower drilling field 6 and the surrounding area of ​​35-50m within the fault structure belt 1 (length 240m, width 150m), two rows of horizontal curtain grouting holes 2 are constructed in sequence, and they are arranged in a dislocation and cross. Each hole in the first row corresponds to the middle part between two adjacent holes in the first row. The horizontal distance ...

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Abstract

The invention relates to a pre-grouting reinforcement method for a fault structure zone on a working face, and belongs to the technical field of grouting support in coal mines. The advance pre-reinforcement operation is as follows: when the working face advances to 300-400m from the edge of the fault structure zone, under the static pressure condition of the working face, follow the trough up or down the working face along the advancing direction of the working face, and move toward the fault structure zone. Drilling, lowering, sealing and grouting of curtain grouting holes, shallow holes and deep holes in the area; then drilling, lowering and sealing of reserved holes; when the working face advances to the distance fault When the edge of the construction zone is 30-50m, under the dynamic pressure condition of the working face, grouting operation is performed on the reserved holes. The present invention achieves the purpose of proactively controlling faults in advance, with higher safety, and at the same time solves the passive and lagging construction problems of conventional methods, as well as the problem of the progress of forced stop production of faults in the treatment of faults, and realizes in a real sense It ensures continuous and efficient recovery during the working face crossing faults.

Description

technical field [0001] The invention belongs to the technical field of grouting support in coal mines, and in particular relates to an advanced grouting reinforcement technology method for broken coal rock mass in an underground fault structural belt. Background technique [0002] Faults are common geological structures in coal mine working faces. The original rock stress in the fault structure zone is complex and the integrity of the rock mass is poor. During the mining process, when the work faces an abnormal zone near the fault, the fault will be further activated. Affected by the broken surrounding rock environment and mining activation in the fault structure zone, it is easy to cause large-scale roof caving, coal wall siding and roof pressure frame accidents. When the working face passes through the fault, it is extremely difficult to maintain the roof and coal wall. The difficulty and low efficiency of the working face crossing the fault structural belt, and the four ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D11/10E21B33/13
CPCE21D11/105E21B33/13
Inventor 曹海山张敦喜王波李俊斌杨张杰王传兵杨永刚李世辉余大军钱统傲王庆牛李琰庆王福海王威陈康
Owner HUAINAN MINING IND GRP
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