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Safety technical measures for crossing fault and fracture zone
Release time:
2019-08-27
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In the process of working face advancement, faults of different sizes will be encountered. Near the fault, the coal seam becomes soft, the inclination angle changes, the water drenching increases, and the roof is relatively broken. During the working face crossing the fault, the following should be strictly implemented.Safety technical measures.
1. When encountering a fault, the support density of the fault zone must be strengthened and the column spacing of the fault zone must be reduced to 500-600mm.
2, according to the actual situation of the site, as appropriate in the top line of a row of trees on the nest column or shed to strengthen support, if necessary, in the second row of columns on the nest column to strengthen support, nest column to face the roof to press the direction of the nest (positive, negative, oblique nest can be.
3, must strictly strengthen the fault zone and fracture zone of the roof plug back, the top of the small plate must be inserted back intact, when the roof is broken, the top of the small plate must be inserted back tight, the headspace must be connected with large material plug back, headspace is strictly prohibited.
4, fault and fracture zone hole blasting can only use dense hole (eye distance is 600-700mm), less charge (each hole is loaded with 1-2 medicine rolls), small gun (a maximum of a detonation top, bottom four charging eyes), it is strictly prohibited to large area blasting.
5, fault and broken zone must be timely hanging support after blasting, and depending on the site situation as appropriate tree or every dozen on the stick to help column, stick to help column rear can put down a gun.
6, the fault zone should be divided into the same group of work, and arrange a strong sense of responsibility, experienced old workers in the section of work, by a monitor personally command and responsible for the sectionSecurityQuality work, found notSecurityHidden dangers must be immediately organized to deal.
7, if the fault with the roof is particularly broken, coal wall piece to help, should use large plate or square wood with wood pillar a plate three columns to the coal wall to strengthen the support, pillar cap size is not less than length * width * height = 400mm * 120mm * 70mm, the middle of the column cap should be rough surface, to prevent the pillar from falling off, large plate or square wood can only be used to pick the top, is strictly prohibited to cut the top.
8. When the fault zone is undercover, the amount of undercover at one time is appropriate to be 300mm, and the column head should be inclined 3-5 degrees to the coal wall when the column is hit, and the column head should be inclined 3-5 degrees to the direction of Laotang when the column is hit, so as to increase the stability of the column.
9. Special personnel must be assigned to observe the mountain for the pillar and pillar of the fault zone, and the back road shall be unobstructed.
10. The team leader, security inspector and quality inspector at the end of the shift must strictly check and accept the engineering quality of the fault zone. If unqualified products are found, personnel must be organized to rectify them in time.
11. The strike fault drop is greater than the mining height
When the working face encounters this type of fault, the working face can be divided into two sections with the fault as the boundary, and the middle lane is excavated along the fault. The coal in the upper working face is transported out of the middle lane. If the fault does not extend long, the middle lane may not be excavated, but the oblique eye is excavated every 5 meters along the strike and transported out through the lower working face.
12. Large drop of inclined faults
For this type of fault, another cut should be made to make the working face skip the fault for mining.
13. Large drop of oblique faults
For this type of fault, another cut should be excavated to skip the fault. Because the fault is oblique to the working face, triangular coal appears on both sides of the fault. In order to improve the recovery rate, it should be mined. According to different situations, the following two methods can be adopted.
① When the fault is at an angle of 25-45 degrees between the true inclination, the working face shall be pushed along the downward trend according to the true inclination, and the shortened part of the working face shall be reserved as a passage.VentilationandSecurityExit, the face is shortened to 10-20 meters, you can start to stop mining.
② When the included angle is less than 25 °, the method of adjusting the surface by clamping the wedge is adopted, and the advancing of the working surface ensures a straight line.
14. The drop of the fault is less than the thickness of the coal seam
In this case, the working surface is generally flat push hard.
① When allowed, the direction of the inclined fault can be changed to make the fault oblique to the working face, or reduce the length affected by the fault when the working face is advanced each time, and the oblique angle cannot be too small.
② Affected by the fault, when the coal seam is thin near the fault and it is difficult for pedestrians to pass through, the top or undercover shall be selected according to the strength of the top and bottom plates and the condition of the fault, so as to ensure thatSecurityBut also a small amount of processing, so that the slope of the working surface floor can be stable changes.
③ In order not to affect the normal mining of the working face, the vicinity of the fault should be treated ahead of time. When dealing with the fault, shallow eyes should be punched, less charging and small guns should be fired. Enlarged guns are strictly prohibited near the fault.
④ When the working face is adjacent to the fault, the support quality should be strengthened, the pillars should be densified, the column spacing and row spacing should be reduced, and the fault surface should be supported by wooden stacks and oblique bracing near the fault.
⑤ Determine reasonable caving step distance and clean the pillars outside the fault at one time.
15. The column cap shall be orthogonal or oblique to the fault line and shall not be used along the fault line.
16, fault area must ensure smooth passage, slip skin, materials to avoid stacking on the 3. four rows, to prevent roof burial materials.
17, over the fault period, each shift must have attendant on duty at the scene, the sceneSecurityOff.
18, in the working face, off work handover, working face fault zone must focus on handover, shall not appear a unqualified pillar.
19, where the working face fault zone nearSecurityHidden dangers, in accordance with the provisions of the three violations of the implementation of the upper limit of punishment.
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