What is the advance distance of water exploration and drainage in "Coal Mine Safety Regulations"?
There is less drilling from the starting point of water search to the direction of water search. Therefore, in the process of advanced water search, water search-excavation-water search is often carried out circularly. The final position of the water exploration borehole should always be kept at a distance in front of the working face. The length of lead distance depends on the thickness of ore body.
Due to the inability to accurately grasp the range of accumulated water, in general, there should be enough distance between the starting point of water exploration and suspicious water sources, and 75 ~ 150 m is generally appropriate.
Extended data
Layout principle of drilling holes for water exploration and drainage:
Drilling holes for exploring old empty water and water should be arranged in groups and fan-shaped on the plane. The position of the final borehole shall be subject to the horizontal distance of 3m, and the vertical distance of each final borehole in thick coal seam shall not exceed1.5m. The boreholes for detecting fault water must be arranged in front and below the heading direction, and the number of boreholes in the floor direction shall not be less than 2, and the diameter of the final borehole for detecting water shall generally not be greater than 58 mm. ..
When the water exploration rig is exploring old empty water in an expanded range or exploring old empty water from the lowest point, it must have an orifice water control device, and the installation method of orifice pipe depends on water pressure and coal pillar. Valves and pressure gauges shall be installed outside the orifice pipe.
When the roadway is driven from high to low and parallel to the water accumulation area in the old goaf, a long drilling rig can be used to explore and drill ahead to gradually reduce the water pressure and eliminate the water disaster in the upper goaf. After the drainage of the old tunnel in Laotang, the residual water body can be excavated while exploring with a long drill pipe, exploring for 3m, and excavating1m..
Baidu Encyclopedia-Coal Mine Exploration and Drainage Regulations
Baidu encyclopedia-advanced water exploration