How to carry out water exploration and drainage in

2022-06-19
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How to carry out water exploration and drainage in mining face with the continuous expansion of social demand for energy, the coal market is becoming more and more optimistic, and the scale and scope of coal mining are expanding. In addition, the long history of coal mining and the indiscriminate exploitation of small coal mines in towns and villages have formed many goaf areas. Some of these goaf areas are connected with surface rivers, and some of them are due to the accumulation of production water during mining, In addition, there are geological aquifer ponding and so on, which pose a threat to the safety production of new coal mines. Therefore, before the mining of new mines, mining areas and working faces, customers can use Santoprene to replace TPE for blowing the shaft sleeve of constant speed drive joint. Detailed geological exploration must be carried out to thank the Chinese side for its care and convenience in transit transportation. Water exploration and drainage work should be carried out for the old air and aquifers that may threaten the working face, so as to eliminate hidden dangers and ensure safety. According to the production nature of water exploration and drainage, it can be divided into water exploration and drainage in development (Tunneling) face and water exploration and drainage in mining face; According to different levels of water exploration and drainage, it can be divided into adjacent (upper or lower) layer water exploration and drainage and this layer water exploration and drainage; According to different locations of water exploration and drainage, it can be divided into old air exploration and drainage and aquifer exploration and drainage. The following is about the production practice of water exploration and drainage in the upper layer of the mining face in panel 804 of Yangquan Yinying Coal Mine

1 basic information of 80401 working face for water exploration and drainage

80401 working face is generally high in the northwest and low in the southeast. The coal seam strikes near the east-west direction and dips to the south, with an inclination of 2 ° ~ 8 ° and an average of 5 °. The mining length of 330m in front of the work is 110m, and that of 560m behind the work is 140m. The total length of the trench is 890m. The contour of the coal seam floor at the cutting hole of the working face is + 824m ~ + 830m, and the contour of the upper 2.33m coal seam floor is + 870m ~ + 872m. 82 coal seam is mined in this working face. Its structure is simple and relatively stable. Its thickness is 1.2m ~ 1.9m, with an average of 1.6m; Some parts contain 0.02M ~ 0.30m carbonaceous mudstone interlayer. The lithology of coal seam roof is basically stable, including 0.4m mudstone false roof, 13.85m direct roof composed of fine sandstone, sandy mudstone and mudstone, and 20.33m medium sandstone main roof; The joint fissures of the coal seam roof are developed, and the local roof strata are broken; The lithology of the floor is stable sandy mudstone. The upper part of the working face is the goaf of 30118 working face of 3 coal seam of the mine and the goaf of 3 coal seam of No. 1 coal mine of Yangquan Coal Group. It is estimated that there is ponding in the old goaf and the gas content is large. The working face is a high-grade common mining face, which adopts the roof management method of inclined longwall retreating mining method and all caving method

2 water exploration and drainage methods

(1) prepare corresponding water exploration and drainage safety technical measures according to the water exploration and drainage principle of "exploration and drainage in case of doubt" and the geological exploration data provided by the geological department. The determination of drilling parameters shall be based on the principle that the penetration point of the drilling shall be at the lowest point of the upper layer and the opening point of the drilling shall be at the lower roadway of the working face of this layer, and the drilling distance of the drilling shall be as short as possible. At the same time, it is required to implement the principle to all relevant personnel before commencement

(2) make all necessary preparations for water exploration and drainage construction, including drilling rig and its ground operation, spare parts, power supply system and water supply system of downhole drilling rig, power supply system of drainage, water pump and pipeline system, etc

(3) during operation, the direction shall be marked by the survey department in strict accordance with the requirements of drilling parameters, and the professional personnel shall guide the setting up of drilling rig and preliminary drilling work. In order to control the water discharge amount according to the situation when the upper water is discharged, a large drill bit (with a diameter of 120mm, so as to install an iron pipe with a diameter of 100mm) should be used to pass through the direct roof of the coal seam during the preliminary drilling (because the direct roof is generally unstable, water will seep from the rock seam when the upper water pressure is large). The drilling depth is generally 2m ~ 4m, which is mainly to facilitate the insertion of 100mm diameter pipe (hereinafter referred to as control pipe) in this section and the installation of water control valve

(4) there are two methods to install the control pipe: one is to wrap cotton sheath or palm fiber around the pipe, wrap it firmly with iron wire, and then push it in place by the top of the drill and hit it with a hammer. In order to prevent the pipe body from falling off due to excessive water pressure in the hole, a berm should also be erected under the flange of the control pipe, and the top of the berm acts on the large iron plate around the pre welded flange, The iron plate can also be lifted by two lifting sheds to strengthen its stability. The iron plate is square or round, with an area of about 0 15 m2; The other is to load the mixed cement mortar (not too thin, and add a certain proportion of accelerator) into the high-quality product control pipe, the quantity of which is about 1/2 ~ 2/3 of the pipe length, and then make a piston tray to push the mortar in the pipe, so that the mortar can be pushed out of the pipe for a certain length (about 20cm ~ 30cm) so that it can be plastered and adhered to the hole wall, while slowly hitting or pushing the control pipe, The mud can be filled between the outer wall of the control pipe and the inner wall of the borehole, so that the control pipe can be firmly inserted into the hole, and then the water control valve shall be installed in time

(5) after the control pipe is inserted, normal drilling can be carried out. During drilling, the jacking force of the drill shall not be too large to prevent the drill bit from falling off or deviation in the drilling direction. Before drilling, it is necessary to ensure that the drainage system is safe

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