Support method used in passing water guide fracture structure in mine exploration

Abstract

The invention discloses a support method used in passing a water guide fracture structure in mine exploration, belonging to an underground mining method. The support method comprises the following steps: a working roadway is tunneled along a vertical fault direction, temporary support is carried out once when tunneling forwards for 1-2 m, when the working roadway is dug to be at a distance of 5-10 m from the fault, tunneling is stopped, the working roadway is expanded and brushed, a grouting device roadway with the length of 3 m is expanded and brushed, a grouting device is provided, multiple pipe shed holes are formed from the tail end of the grouting device roadway to the fault, the pipe shed holes are located above the top wall of the working roadway, a pipe shed support is arranged in each pipe shed hole, and a grouting pipe is connected with each pipe shed hole, so that cement mortar flows into underground water of a fracture zone; the working roadway is tunneled, when the working roadway is tunneled to be at a distance of 2 m from the fault surface, tunneling is stopped, and multiple anchor rows are driven to a direction of the water guide fracture structure from a place at a distance of 2 m from the fault surface; at last, multiple drainage holes are formed from the tail end face of the working roadway to the fault direction. According to the invention, when the roadway is dug to pass the fracture structure, collapse cannot happen, a digging process is safe, and larger economic benefit can be obtained.

Description

technical field [0001] The invention relates to an underground mining method, in particular to a supporting method for mining a water-conducting fracture structure. Background technique [0002] The Sanshandao gold deposit is a mineral deposit dominated by structural fractures filled with water. Among them, the F3 fault is a regional deep water-conducting fault, and it is also the largest water-conducting fault in the mining area. The fault enters the sea from the northwest section, and the fault strikes about 310°. The dip angle of the fault surface is very steep, all greater than 85°. The width of the fault fracture zone is generally 5-20m, and the widest is 30m. It is a tension-torsion water-conducting structure. There are several diabase dikes and wall rocks (granite, altered granite and sericite, etc.) breccias in the fault zone. Because the rocks in the fault zone are extremely broken and the fault breccias produced are not cemented, this provides a good space for th...

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Problems solved by technology

[0003] In the prevention and treatment of the F3 fault, the existing method adopts the solution of grouting and water blocking reinforcement by laying holes around the roadway, that is, digging the roadway and injecting grouting work in the early stage, that is, digging the working roadway first, and the section of the roadway is 4.2 meters long × The width is 3.4 meters, and the excavation is stopped until it is 1-2 meters away from the fault surface. Then, from the beginning of the roadway to the roadway, advance 1-2 meters in each direction, and excavate a channel with a length of 5.2 meters and a width of 4.2. A U-shaped steel bracket, which is used to support the section of the roadway. After the U-shaped steel bracket is installed, excavate the section of the grouting equipment for placing the grouting equipment from the end of the roadway, and place the grouting equipment on After the section of the grouting equipment, a number of water injection grout holes are opened in the direction of the fault from the section of the grouting equipment, and the cement mortar is continuously injected into the water injection grout holes, so that the cement mortar flows into the water area at the lower part of the fault zone, and the cement mortar flows into the water area below the fault zone. Absorb the water in the lower part of the fault zone to keep the lower part of the fault zone as dry as possible. However, after the grouting hole is opened, the roadway is easy to collapse because the rock formation near the fault is loose and not strong, which has no effect on the safety of the roadway excavation process. Security, a greater threat to personal safety

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