Through the prediction of working face, the working face is divided into outburst dangerous working face and non-outburst dangerous working face.
Mining face without face prediction should be regarded as outburst dangerous face.
Article 60 Outburst prevention measures must be taken in the working face with outburst danger, and the effect of the measures must be tested. After the inspection proves that the measures are effective, it is determined that there is no outburst danger working face; When the measures are ineffective, it is still a dangerous working face, so supplementary outburst prevention measures must be taken and the effect of the measures should be re-tested until the measures are effective.
In the face without outburst danger, mining operations must be carried out under the conditions of taking safety protection measures and leaving enough advance distance of outburst prediction or advance distance of outburst prevention measures.
The minimum predicted advance distance that should be reserved for coal roadway excavation and mining face is 2m.
The minimum advancing distance of outburst prevention measures reserved in the working face is: 5m in the heading face of coal roadway and 3 m in the mining face; In areas with serious geological structure damage, the lead distance should be appropriately increased, but the heading face of coal roadway should not be less than 7m and the mining face should not be less than 5m.
After the completion of outburst prevention measures in each working face, the completion map of outburst prevention measures in working face should be drawn.
Article 61 Before exposing outburst coal seams in crosscut, vertical shaft and inclined shaft, it is necessary to accurately control coal seams and master their occurrence position and form.
Before the coal uncovering face is excavated to the minimum normal distance from the coal seam 10m, at least two pre-exploration coring holes should be drilled, which penetrate the full thickness of the coal seam and enter the top (bottom) plate not less than 0.5m, and the coring data should be recorded in detail. When the gas pressure needs to be measured, the pre-exploration borehole can be used as the measurement borehole; If these two methods can't be used, the measuring boreholes should be arranged at the position with the largest distance between the coal-seeing points of each borehole in this area.
In areas with complex geological structure and broken rocks, a certain number of pre-exploration boreholes must be arranged before the minimum normal distance of 20m from the coal seam, so as to ensure that the thickness, dip angle change, geological structure and gas situation of the coal seam can be accurately grasped.
Geophysical prospecting and other means can also be used to detect the horizon and occurrence of coal seam and the rock density of floor (roof).
Article 62 The process from the minimum normal distance of the bottom (top) plate of the outburst coal seam to the minimum normal distance of 2m (minimum normal distance) of the top (bottom) plate through the coal seam belongs to the coal uncovering operation. Before uncovering coal, the special outburst prevention design for uncovering coal should be compiled and reported to the technical director of the coal mining enterprise for approval.
The coal uncovering operation shall be carried out by a professional team with corresponding technical capabilities, and shall be carried out in accordance with the following operating procedures:
(a) proved the relative position of uncovering coal face and coal seam;
(two) prediction (or regional verification) in the working face at an appropriate distance from the coal seam;
(three) when the working face prediction (or regional verification) is in danger of outburst, take measures to prevent the working face from protruding;
(four) the implementation of working face measures effect test;
(5) Long-distance blasting excavation reveals the position of the working face in front of the coal seam, and the method of working face prediction or measure effect test is adopted for final verification;
(six) take safety protection measures and use long-distance blasting to uncover or cross the coal seam;
(7) Strengthen the support of the joint between rock roadway and coal seam.
Article 63 The outburst risk prediction of coal uncovering faces in crosscut, vertical shaft and inclined shaft must be conducted before the minimum positive distance of 5m from the outburst coal seam (in areas with complex geological structure and broken rocks, the positive distance should be appropriately increased).
When there is no outburst danger in the working face prediction or measure effect inspection, the position of the working face in front of the coal seam can be exposed by driving long-distance blasting, and then the working face prediction method is used for final verification. If it still proves to be a working face without outburst danger, long-distance blasting will be used to expose the coal seam under the condition of taking safety protection measures; Otherwise, outburst prevention measures must be taken or supplemented.
When the prediction of working face or the effect test of measures is to highlight the dangerous working face, the outburst prevention measures must be taken or supplemented until there is no outburst dangerous working face after the effect test of measures.
Article 64 For the working faces of crosscut, vertical shaft and inclined shaft, geophysical prospecting or drilling must be adopted to explore from the excavation to the minimum normal distance of 5m from the outburst coal seam, so as to ensure that the minimum normal distance from the working face to the coal seam is not less than the minimum distance required before the outburst coal seam is exposed by long-distance blasting.
When long-distance blasting is used to expose outburst coal seams, the minimum normal distance between coal seams is required, which is 2m for steeply inclined coal seams and 1.5m for other coal seams. It is required that the minimum normal distance between vertical shaft coal uncovering face and coal seam is: steeply inclined coal seam 1.5m, and other coal seams are 2m. If the rock is soft and broken, the normal distance should be increased appropriately.
Article 65 If the top (bottom) surface of coal seam is not exposed at one time after the outburst coal seam is exposed by long-distance blasting in the coal uncovering face, it should still be carried out according to the requirements of long-distance blasting until all coal uncovering operations are completed.
Article 66 When exposing outburst coal seams with a thickness less than 0.3m in crosscut, vertical shaft and inclined shaft, remote blasting can be used to directly expose coal seams.
Sixty-seventh roadway heading face and coal mining face with outburst coal seam shall prepare the special outburst prevention design of the working face and report it to the mine technical director for approval. In the process of implementation, when the coal seam occurrence conditions change greatly or the roadway design changes, the design should be supplemented or modified.
Article 68 The heading face and mining face of coal roadway where local comprehensive outburst prevention measures are implemented have no outburst danger as the prediction index, and only when the prediction index of the previous cycle is also no outburst danger can they be determined as the face without outburst danger, and the mining operation can be carried out under the conditions of taking safety protection measures and leaving enough predicted lead; Otherwise, it is still necessary to carry out the outburst prevention measures and the effect test of the measures. Article ninety-eight when using drilling method to test the effect of outburst prevention measures, the inspection boreholes distributed in all parts of the working face should be arranged in the position where the density of outburst prevention measures is small and the hole spacing is large, and should be far away from the surrounding outburst prevention measures boreholes or keep the same distance as possible with the surrounding outburst prevention measures boreholes. In areas with complex geological structures, inspection boreholes should be appropriately increased according to the situation.
The effect inspection of outburst prevention measures in working face must include the following two parts:
(a) to check whether the outburst prevention measures implemented in the working face meet the design requirements, whether they meet the relevant regulations and standards, and to understand and collect relevant information such as the working face and implementation measures, highlighting early warning and so on. (including nozzle and sticking, etc.). ) as one of the contents of the measure effect inspection report for comprehensive analysis and judgment;
(2) Determination of various inspection indexes and main data.
Article 99 When testing the effect of outburst prevention measures in Shimen and other coal uncovering working faces, the indicator method of gas desorption from cuttings listed in Article 71 of these Provisions or other methods proved to be effective by experiments shall be selected, but the number of inspection holes in all drilling inspection methods shall not be less than 5, which are located at the upper, middle, lower and both sides of Shimen respectively.
If all the indexes of the inspection results are lower than the critical value of coal seam outburst risk, and no other abnormal conditions are found, the measures are effective; Otherwise, it is judged that the measure is invalid.
Article 100 After the outburst prevention measures are implemented in the heading face of coal roadway, the methods listed in Article 74 of these Provisions should be selected to test the effect of the measures.
There should be no less than 3 inspection holes, and the depth should be less than or equal to the depth of outburst prevention measures.
The inspection index of the effect of measures in coal roadway heading face is less than the index critical value, and no other abnormal conditions are found, then the measures are effective; Otherwise, it is determined that the measures are invalid.
When the inspection results and measures are effective, and the projection length (referring to the depth of the projection hole) of the inspection hole and the outburst prevention measures hole to the heading direction of the roadway is equal, the heading can be carried out while keeping the advancing distance of the outburst prevention measures (see Article 60 of the present Provisions) and taking safety protection measures. When the projected hole depth of the inspection hole is smaller than that of the hole drilled by outburst prevention measures, excavation shall be carried out after safety protection measures are taken under the condition that the propulsion distance required by outburst prevention measures and the propulsion distance of the projected hole depth of the inspection hole are reserved at least 2m.
Article 101 The inspection of the effect of outburst prevention measures in coal mining face shall be carried out with reference to the methods and indicators of outburst risk prediction in coal mining face. However, an inspection borehole should be arranged every 10 ~ 15m along the coal mining face, and the depth should be less than or equal to the depth of outburst prevention measures.
If the inspection index of the coal mining face is less than the critical value of the index, and no other abnormal conditions are found, the measures are effective; Otherwise, it is determined that the measures are invalid.
When the inspection results and measures are effective and the depth of the inspection hole is equal to the drilling depth of outburst prevention measures, mining can be carried out under the conditions of keeping the advancing distance of outburst prevention measures (see Article 60 of these Provisions) and taking safety protection measures. When the depth of inspection hole is less than the depth of outburst prevention drilling hole, mining operation should be carried out after safety protection measures are taken under the condition of reserving the propulsion distance required for outburst prevention measures and the propulsion distance of 2m inspection hole. (1) The shelter is equipped with an isolation door that opens outward, and the isolation door is set according to the anti-damper standard. The indoor clear height shall not be less than 2m, and the depth shall meet the requirements of diffusion ventilation. The length and width are determined according to the number of people who may take refuge at the same time, but at least 15 people can take refuge, and the usable area of each person is not less than 0.5m2 The support in the refuge is well maintained, and there is a direct telephone with the mine (well) dispatching room;
(2) Sufficient drinking water and air supply facilities should be placed in the cabin, and the air supply per person should not be less than 0.3m3/min. If compressed air is used for air supply, a pressure reducing device and a breathing nozzle with valve control are provided;
(3) Shelters shall be equipped with a sufficient number of isolated self-help personnel according to the designed maximum number of asylum seekers.
Article 103: At least two solid and reliable reverse dampers must be set at the air inlet side of the coal seam cross-cut uncovering and coal roadway driving face. The distance between dampers should not be less than 4m.
The distance between the reverse damper and the working face and the number of reverse dampers should be determined according to the ventilation system and the expected outburst strength of the tunneling working face, but the distance between the reverse damper and the return air lane of the working face should not be less than 10m.
Reverse air door wall group
Brick, stone or concrete can be used for masonry. The depth of rock embedded around the roadway can be determined according to the nature of the rock, but it should not be less than 0.2m. The thickness of battlements should not be less than 0.8m. When building reverse air doors in coal lanes, it is necessary to cut around the air door wall, and the cut depth should not be less than 0.5m before entering the solid coal body. Air duct, ditch, scraper conveyor path, etc. A reverse partition device must be set through the reverse air door battlements.
When personnel enter the working face, they must open and close the reverse damper. When the working face is shot and there is no one, the reverse damper must be closed.
Article one hundred and four in order to reduce the intensity of blasting induced outburst, according to the situation, you can install a fence on the blasting face. Fences can be made of metal, coal gangue or wooden piles. Metal fence is generally a grid-like frame arranged by channel steel. The spacing of channel steel in the frame is 0.4m, and the channel steel is fixed with snap rings. When in use, the metal net is laid on the frame facing the working face, and then the frame is supported into a 45-degree inclined plane with wooden posts. A group of guardrails usually consists of two guardrails with a distance of 6 ~ 8m. The distance between the barrier and the working face can be determined according to the expected outburst strength in the design.
Article 105. Long-distance blasting safety protection measures must be taken in blasting excavation and blasting mining faces with outburst coal seams exposed in roadway.
When long-distance blasting is used to expose coal uncovering in crosscut, special measures including shooting location, disaster avoidance route, power failure, evacuation and warning range must be formulated.
In the early stage of mine construction, which has not yet formed full wind pressure ventilation, other working faces related to this crosscut must stop working during the whole operation process of exposing coal seams with outburst danger. When long-distance blasting is carried out to expose outburst coal seams, all underground personnel must be evacuated to the ground, and all underground power supply must be cut off. No fire source is allowed within 20 meters of the ground near the vertical wellhead, 50 meters before the inclined wellhead and 20 meters on both sides.
When long-distance blasting is used in the heading face of coal roadway, the shooting location must be located in the fresh airflow or shelter with full wind pressure ventilation outside the reverse damper on the air inlet side, and the distance from the shooting location to the working face shall be determined by the mine technical director according to the specific conditions such as the maximum outburst intensity that has occurred, but it shall not be less than 300 m; The distance from the shooting location of the coal mining face to the working face shall be determined by the mine technical director according to the specific situation, but it shall not be less than 100m. ..
During long-distance blasting, the return air system must be powered off and emptied. The time to enter the working face for inspection after blasting shall be decided by the mine technical director according to the situation, but it shall not be less than 30 minutes.
106th outburst coal seam mining face should be set up face refuge or compressed air self-help system. One or more of them should be set according to the specific situation, but the working face shelter must be set in the roadway with a driving distance of more than 500m m.
The working face refuge should be located near the coal mining face and the place where the blaster controls the blasting. Determine the number of shelters and their distance from the working face according to the specific situation. Working face refuge should be able to meet the requirements of the largest number of people in the working face, and other requirements are the same as those in the mining area. (1) The compressed air self-rescue device is installed on the compressed air pipeline in the roadway of the heading face and the roadway of the mining face;
(2) At least one set of compressed air self-rescue device should be set up in the roadway 25 ~ 40m away from the coal mining face, the location of shooting, the location of evacuation personnel and alert personnel, and the location of manned return air lane. In the long-distance driving roadway, the setting should be increased according to the actual situation;
(3) Each set of compressed air self-rescue device can be used by 5 ~ 8 people, and the average compressed air supply per person is not less than 0. 1m3/min.