Several problems in mine design

The design of the mine needs to pay attention to many problems. Only when the conditions are met can the mine be mined, firstly the requirements for the “three quantities”; secondly, the main inclined shaft (belt) inspection road; and the third, the number and number of the mining work surfaces; The fourth is to highlight the mine and high gas mine production nuclear reduction; finally, regarding the roadway cross-sectional area, after meeting these conditions, the design can be used to ensure the safety of mine mining, and it can promote the future mining rights and mineral rights transfer.

1. Requirements for “three quantities”

"Coal mine safety facilities construction project design review and final acceptance norms" (AQ1055-2008) 4.2.4 provides that: exploration, preparation, back to the amount of coal compliance. The mining period of large and medium-sized mines should be more than 3 years, the preparation period of coal preparation should be more than 1 year, the recoverable period of coal recovery should be more than 4 months; the mining period of small-scale coal mining should be more than 2 years. The reserve coal preparation period shall be greater than 8 months, and the recoverable coal recovery period shall be greater than 3 months.

Three quantities refer to recoverable reserves.

2. About the main inclined shaft (belt) inspection road

The design capacity of Shaqu Mine is 3.0Mt/a, and the track is repaired and the section of the wellbore is reduced. In the past, when designing the main inclined wellbore, an overhaul track was usually placed on the side of the belt conveyor. Although the tape inspection is convenient, the wellbore section is large, the cost of the wellbore infrastructure is high, and a lifting winch is also occupied. From the actual situation of the production mines in China, the utilization rate of the maintenance track is very low. For this reason, the design of the main inclined shaft of the Shaqu mine is innovative and the maintenance facilities are cancelled. The replacement of the intermediate section of the belt conveyor is manually solved. It has been in operation for six years and is in good condition.

The design capacity of Guizhou Gaoshan Mine is 0.6Mt/a, and there is no overhaul in the main inclined shaft. However, there is an overhead passenger device with a lane width of 4.7m and a glue width of 1000mm. But what if the belt is replaced? The design of the Guizhou Gaoshan Mine is that there is a lane between the main and auxiliary shafts every 40m, which can transport equipment.

3. About the number and number of mining faces

"Guiding Opinions on Strengthening the Safety Management of Small Coal Mines" (Safety Supervision and Control Co., Ltd. [2007] No. 95) stipulates: Ensure that the mine production system is complete and reliable. The production layout of the mine and mining area is scientific and reasonable. The mining face adopts the formal wall mining method, and the roadway type coal mining is strictly prohibited to ensure the perfect system and reliable operation. For a mine with an annual output of 60,000 tons or less and a mining area with an annual output of more than 60,000 tons, only one coal mining face is allowed, and two tunneling faces are produced at the same time. In addition, it is also stipulated that during the “Eleventh Five-Year Plan” period, all regions will stop approving (approving) new coal mine projects with a capacity of 300,000 tons/year.

The State Council Security Committee Office's "Guiding Opinions on Further Strengthening Coal Mine Gas Control Work" (Anwei Office [2008] No. 17) stipulates that only one mining work can be carried out in the same coal seam in each mining area of ​​high gas and coal and gas outburst mines. Production is carried out.

"Basic Requirements for Safety Approval of Coal Mine Construction Projects" AQ1049-2008 stipulates: Newly built coal and gas outburst mines, designed production capacity should be 450,000 tons / year and above, but not higher than 5 million tons / year, the number of working face No more than 2 (excluding the number of working faces for mining protective layers).

Henan Coal Industry Safety Supervision Bureau of Henan Coal Industry Administration, “Notice of Forwarding the National Coal Mine Safety Supervision Bureau of the State Administration of Work Safety on Strengthening the Management of Coal Mine Labor Management and Strictly Controlling the Number of Downhole Operations” (2007) No. 972, in the mining area and When the working face is arranged, no more than 3 (including 3) mining working faces or 5 (including 5) or more working faces shall be arranged in the same coal seam in one mining area, and one working area and one mining working face shall be gradually implemented. The way in which the working face is driven. The production capacity of a mining area with a production capacity of 60,000 t/a or more, 300,000 t/a and below, and a mine of 60,000 t/a or less, at the same time, the working face of coal mining shall not exceed one, and the working face of the excavation shall not exceed two. One.

In the book “Working and Management of Underground Coal Mines”, P106, “The mining area is the basis for the production of mines. It ensures the normal mine production by establishing complete mining, transportation, ventilation, drainage and power supply systems. The number of mining areas produced should reflect the principle of rational centralized production in the mining area and the normal replacement of the mining area, generally not more than three.

Article 48 of the Decision of the State Administration of Work Safety, No. 29 of the “Regulations on Amending the Safety Regulations of Coal Mines”, Article 48 is amended as follows: A wing of the same coal seam in a mining area can only be equipped with a maximum of one working face and 2 The work faces are dug at the same time. In the same coal seam with double-wing mining or multi-coal mining in a mining area, the mining area can only arrange two working faces and four working faces at the same time.

4. About the production of nuclear mines and high gas mines

The General Office of the People's Government of Henan Province on the "Emergency Notice for Resolutely Curbing the Serious Accidents of Coal Mines", Henan Administration Office [2008] No. 90: Strictly reduce the production capacity of all types of coal seams. All kinds of mines that exploit the outburst coal seam and are seriously threatened by the impact of ground pressure will be reduced by 30% according to the approved capacity. The production will be organized in strict accordance with the reduced capacity. Otherwise, it will be severely punished according to the law.

Notice of the General Office of the People's Government of Henan Province on Forwarding the Implementation Opinions on the Classification Management of High Gas and Coal and Gas Outburst Coal Mines in Henan Province (Yu Zheng Office [2012] No. 18): Mines with Class I gas management areas are subject to approved production capacity 80% of the organization produces, the mines with the II gas management area are organized and produced according to 90% of the approved production capacity, and the mines with the III gas management area are organized and produced according to 90% of the minimum production system capacity. For high-gas production of coal and gas-exposed mines with super-capacity production, penalties shall be imposed on coal mining enterprises and responsible persons in accordance with the upper limit stipulated by laws and regulations such as the “Special Provisions of the State Council on Preventing Coal Mine Production Safety Accidents” (State Council Order No. 446). .

5, on the roadway sectional area

The design code for small mines in the coal industry (GB 50399-2006) stipulates that the section of the roadway in the mining area shall be comprehensively determined according to factors such as equipment, transportation, ventilation, pedestrians, pipeline layout and compression deformation of the section during mining. When using mechanized mining, the net section of the transport channel shall not be less than 7m2, and the net section of the return air duct shall not be less than 6m2, the net section of the upper and lower sections of the transport shall not be less than 6m2, and the net section of the return wind and the downhill shall not be less than 5m2; When mining or wind mining, the net section of the transport chute and return air trough should not be less than 4m2.

Zheng Coal Group stipulates: small mines should not be less than 7m2

Yi Coal Group stipulates that the comprehensive mining wells shall not be less than 18m2

Yu Zheng [2010] No. 17 "Henan Provincial People's Government issued a notice on strengthening certain regulations on coal mine safety production": the net section of coal mine roadway can meet the needs of ventilation, pedestrians, transportation and setting up safety production facilities: the main transport lane of the mine, The net height of the main ventilation lane is not less than 2 meters, the net section is not less than 8 square meters; the net height of the roadway in the mining area is not less than 1.8 meters, and the net section is not less than 5 square meters.

Interpretation of the main wind lanes in the “Safety Regulations for Coal Mines”: The main wind lanes refer to “total wind tunnels, total return air lanes, main air intake lanes and main return air lanes”. Into the wind alley - into

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