75results about How to "Reduce chunk rate" patented technology

The invention provides a mine water stemming bag and an application of the mine water stemming bag in borehole blockage. By means of the mine water stemming bag, local self-locking can be achieved, and leakage of a bag opening can be prevented reliably. By applying the mine water stemming bag to borehole blockage and combining with polyurethane expansion foam composites, a convenient, quick, efficient and reliable borehole blockage effect can be achieved, labor intensity of manual borehole blocking is relieved, construction time is shortened, work efficiency is improved, and the forced mining and forced excavation technical requirements of underground metal mines are met on the premise that the blasting effect is guaranteed.

The invention discloses a diagonal ore-break-down medium-length hole mining method for a steeply-inclined thin vein ore body. The method comprises the following steps: arranging a stope according to the strike of the ore body, dividing rooms, pillars and sections according to the inclination direction of the ore body and arranging a level haulage roadway along the vein of the ore body from the footwall of the ore body; driving ore-drawing crosscuts into the ore body from where the level haulage roadway is located; horizontally arranging an undercutting roadway along the vein and parallely driving rock-drilling prospecting rises along slant height; arranging ore drop shafts to abut against the haulage roadway; starting stoping from one side of the stope, stopping stoping when the undercutting roadway is driven to the position of the first rock-drilling prospecting rise and then driving the rock-drilling prospecting rise; allowing a medium-length hole drilling machine to gradually travels from undercutting roadway to rock-drilling prospecting rise, drilling medium-length upward blast hole, carrying out denotation and drawing ore out from the bottom ore-drawing crosscuts; and after the first rock-drilling prospecting rise reaches a certain position, continuing driving the undercutting roadway until the position of the second rock-drilling prospecting rise is arrived at, carrying out medium-length hole mining, and repeating the above-mentioned operations until stoping of the stope is completed. The diagonal ore-break-down medium-length hole mining method has the advantages of high production efficiency, great production capacity and good operation security.

The invention discloses a segment pre-blasting technology for a steeply dipping hard coal seam roof. Blast holes with different angles and length are distributed in gate roads of air return and transportation roadways in front of a working surface towards a roof rock in front of the working surface; and the blast holes are charged in an uneven way with large charge mass, which has controlled fracturing action on the hard roof.

The invention belongs to the technical field of mining, and particularly relates to a medium-length hole blasting method used for underground mining. According to the method, blast holes are distributed in a fan shape, detonators are simultaneously buried in the middles and at the bottoms of the blast holes, the mode that delayed blasting is carried out from the middle to two sides simultaneously and every two rows of blast holes are taken as one group and are sequentially blasted is adopted in the blasting method, the blasting effect is obviously improved, the block rate is substantially reduced, and the ore removal efficiency is obviously improved. Compared with a traditional blasting method, the blasting method reduces the block rate from 27.6% to 6%, the ore removal efficiency of an ore removal equipment scraper is raised from 58 tons per machine team to 122 tons per machine team, the ore removal cost is reduced from 13.63 RMB per ton to 11.53 RMB per ton, recrushing times are substantially reduced and operation safety is guaranteed.

The invention particularly relates to a presplitting blasting method for water holes close to high and steep slopes, which adopts a reversing hole distribution mode to distribute holes according to a profile map of a slope face. The technical parameters are that coefficient of not coupling of water hole presplitting hole (5) is 1.5-4.5, pitch of the water hole presplitting hole (5) is 1.5-3mm, space between rows of the water hole presplitting hole (5) and cushion hole (6) is 2.5-3m, thread stitching density of the water hole presplitting hole (5) is 1.5-3.5 kg/m, and the hole net parameter ofa main armament hole (7) is 4x4-6x5m2. Explosive charges (4) are filled in the bottoms of the water hole presplitting hole (5), and then a detonating cord (2) is filled in the water hole presplittinghole (5). Each of the 1-8 times of explosive charges is carried out according to the sequence of repeatedly enabling a spacer (3) to be filled in and enabling the explosive charges (4) to be filled in until completion of filling. After the water hole presplitting hole (5) is plugged, the detonating cord (2) and a non-conductivity booster detonator (1) are connected outside the water hole presplitting hole (5) to make preparation for detonation, and advance detonation time of the water hole presplitting hole (5) is 80-100ms. The presplitting blasting method has the advantages of reducing basalrate, reducing large blocks and being high in efficiency and low in consumption.

The invention discloses a charge system for advance rock breaking of a surface mine. The designed blast hole depth L=H/sin alpha'+ h/sin alpha'+ delta h/sin alpha', wherein H is the height of open-air stages, alpha' is the dip angle of blast holes, h is the extra depth, and delta h is the increased depth. An advance primer cartridge (3) and an advance primer detonator (4) are arranged at the blast hole deepened position at the bottom of each blast hole, and the lower portion of each advance primer detonator (4) is located at the position 1/4 of the upper portion of the corresponding advance primer cartridge (3). An isolation section (5) is arranged at the blast hole deepened position of each blast hole (2). A main primer detonator (7) is located at the position 1/4 of the lower portion of each main charge (6). The in-hole micro-delay detonation technology that the advance primer cartridges (3) and the main charges (6) on the upper portions carry out detonation in sequence is adopted so that advance pre-damage of rock on the upper portions of the stages can be achieved, and the situation that the perforating and blasting work of the lower stages is influenced by excessive breaking of the rock can be effectively avoided.

The invention discloses a mining method for stoping a high-dipping thick orebody with the medium and above stability in an ore mass. The method comprises the steps that an inverted-stepped mining faceis arranged in the thickness direction of the orebody in an ore room, mining is advanced from bottom to top, the mining face part close to a hanging wall is ahead of the mining face part close to a lying wall by a certain height, the advanced mining height of the mining face part close to the hanging wall is utilized to provide an operation space, a shallow hole is drilled upwards in the operation space, and a horizontally parallel medium-length hole is drilled in the direction of the lying wall to blast and break ores; and an anchor rod is used for anchoring partial unstable rocks on the hanging wall in the operation space, a part of the mined ores is temporarily left in the ore room to serve as a protective bottom column and a buffer layer of the hanging wall and provide a standing platform for upward operation and temporarily bearing hanging wall rocks, and a large quantity of ores are removed after ore room exploration is completed. The mining method is beneficial for reducing mixing of waste rocks in the mining process of the high-dipping thick orebody and improving the recycling ratio of resources, the blackness of the ores is even, the stope preparation work amount is less,and rock drilling and blast working are easy to organize.

The invention relates to the field of underground blasting construction, in particular to a medium-length hole blasting technology used in a semi-coal-rock roadway. The technical problems that in existing semi-coal-rock roadway blasting, the blasting progress is slow, the shot hole utilization rate is low, the explosive amount is large, and the blasting cap combustion is high are solved. During application experimental investigation, 31 times of tunneling circulation are completed, and the tunneling roadway forming project amount of 55.8 m is completed. At the experimental stage, the actual shot hole depth is 1.8-2.0 m, the average shot hole depth is 1.9 m, the shot hole utilization rate is 90% or above and can reach 91.3% at most, and the average cyclic footage is 1.8 m. On the aspect of blasting material consumption, the average explosive unit consumption at the experimental stage is 1.52 kg/m<3>, and the blasting cap unit consumption at the experimental stage is 2.51 blasting caps per cubic meter. Working face rock is fully smashed, blasting lumpiness is uniform, the boulder yield is very low, blasting muck piles are concentrated, the throw distance of a large amount of rock is controlled at 6-15 m, the workloads of manual waste rock removal and roadway cleaning are reduced, waste rock pouring and rock loading of a rock loading machine are facilitated, and the work hour utilization rate and the rock loading productivity of the rock loading machine are increased.

The invention discloses a different-hardness-degree rock stratum blasting control method used in deep-hole bench blasting. The positions and number of detonation points are finely designed, two-point or multiple-point simultaneous detonation is adopted in the drilling blasting design, and detonation wave frontal collision is utilized to improve pressure of wave front, so that energy is centralized to break locally-hard and difficultly-blasted rock stratums, the different-hardness-degree rock stratum blasting problem in the deep-hole bench blasting is solved, the boulder yield in the hard rock stratum blasting is reduced, the safety of a detonating network is improved, and the different-hardness-degree rock stratum blasting control method is efficient, convenient and fast and facilitates quick construction.

The invention relates to a blast hole uncoupling energy gathering spacing device suitable for a non-coal mine mountain and a using method thereof. The blast hole uncoupling energy gathering spacing device suitable for the non-coal mine mountain comprises a tray body, upper barbs and lower barbs, the upper barbs and the lower barbs are arranged on the periphery of the tray body and used for clamping the hole wall, the tray body comprises an inverted conical disk body and an internal thread column arranged on the upper surface of the inverted conical disk body and provided with internal threads,and the inner wall of the internal thread column is provided with a suspension rubber band buckle; and rubber band holes where rubber bands penetrate are formed in the positions, located below the internal thread column, on the inverted conical disk body, the upper surfaces of the lower barbs are provided with buckles for inward binding rubber bands, the buckles on the surfaces of the lower barbsare provided with the inward binding rubber bands in a penetrating manner, the inward binding ends of the inward binding rubber bands penetrate the rubber band holes to be connected to suspension rubber band buckles, and the tray body is further provided with a detonating cord hole where a detonating cord penetrates. By means of the blast hole uncoupling energy gathering spacing device, through tray installation between plugging and charging, generation of rockets is prevented, flying stone is reduced, and the safety factor of explosion is improved.

The invention relates to a process for striping and mining solid ore rock masses of a surface mine, which comprises a step of drilling a blast hole array, wherein the blasthole array comprises a plurality of rows of blast holes; adjacent rows of blast holes are mutually staggered along the directions of the rows; each blast hole corresponds to a non-blast hole of the adjacent row of blast holes; on each row, the distance between each two adjacent blast holes serves as a hole pitch; and the distance between each two adjacent blast hole rows serves as a row pitch. The process is characterized in that a small-aperture drill bit and a small hole network spacing are selected to drill the holes; the rock drilling speed is improved for more A times than before; the construction operation is carried out according to the small hole network spacing; the number of the drilled holes is increased to B times that of the original drilled holes; the area of each drilled hole is equivalent to one Bth of the area of the original drilled hole; and both A and B are natural numbers greater than 1. According to the invention, the boulder frequency and the blast root residual ratio can be greatly reduced, the striping and mining operations are continuously carried out, the process is convenient to operate, other investment is not required, the explosive load is unchanged, the drilling time is shortened, and the secondary blast quantity is greatly reduced.

The invention discloses a blasting method and application of using shear thickening liquid as blockage of blasting blast holes. The method comprises the steps of filling the blasting blast holes withthe shear thickening liquid, and using the shear thickening liquid to completely cover or partially cover gas blasters in the blasting blast holes; using the shear thickening liquid to completely cover the blasting blast holes to completely fill the gas blasters in the blasting blast holes; detonating the gas blasters. The blasting method applies the shear thickening liquid as a blast hole blockage material for blocking the blast holes, the blockage effect of the blast holes is good, flying stones and splashing are hardly generated during the blasting process, the blasting degree is deep, theblasting efficiency is high, the method is not limited to the arrangement of the blasting blast holes, the freedom of arrangement of the blasting blast holes is more flexible, the blasting process ismore moderate, strong air shock waves are nor generated, damage to the surrounding environment and workers is not caused, blasting noise is small, and the blasting process is safe.

The invention discloses a heading shaped crack blasting method suitable for high-stress ore bodies. The row interval between front-row main blasting gun holes (2) and rear-row main blasting gun holes(4) is 2.5-3.0 times that of a conventional retreating type sectional blasting manner, and a row of heading cracking holes (3) is formed between the front-row main blasting gun holes (2) and the rear-row main blasting gun holes (4). Bidirectional shaped charging devices are mounted in the heading cracking holes (3). The bidirectional shaped charging devices comprise charging pipes, and cross-shaped energy gathering grooves are formed in the charging pipes. The heading cracking holes (3) carry out detonation 15-17 ms earlier than the front-row main blasting gun holes (2), and the rear-row mainblasting gun holes (4) carry out detonation 17-25 ms later than the front-row main blasting gun holes (2). According to the method, unit consumption is reduced by 15% to 20%, the gun hole blasting output per meter hole is increased by 18.5% to 20.5%, and the blasting effect is greatly improved; and the boulder yield is reduced by 35.7%, and the problems that in the high-stress mine ore body extraction process, the unit consumption of explosives is high, and the energy utilization rate is low are solved.

The invention relates to the technical field of open-pit mining, in particular to an open-pit mining method, which is used to solve the problems of high unit consumption of explosives and high block rate caused by blasting mining in hard rock or extremely hard rock mines. The open-pit mining method includes the following steps: Artificial fracturing: artificially fracturing the open-pit steps according to the basic geological data, distribution rules of cracks, mechanical properties and firmness coefficient of ore rocks; crack monitoring: monitoring the artificial fracturing area , to obtain the distribution and extension of the fissures; blasting mining: perform blasting mining according to the distribution and extension of the fissures. The open-pit mining method of the present invention can be applied to open-pit mining of any mineral type, especially can be applied to open-pit mining of hard rock or extremely hard rock mines.

The invention discloses a large-section-height multi-row micro-difference extrusion blasting method. A vertical deep hole is adopted as a blast hole, hole distribution is conducted according to the principle that explosive is evenly distributed in a to-be-blasted rock body, and the hole distribution manner is a rectangular hole distribution manner. Through determination on blasting parameters, anexplosive filling structure is designed, the multi-hole rowed hole distribution manner is selected on the vertical plane, a deflection center point is selected as a blasting point, and micro-difference sequential blasting is adopted between the adjacent holes and is adopted in holes between rows. The large-section-height multi-row micro-difference extrusion blasting method has the beneficial effects that a favorable free face is created for subsequent ore body rock blasting, and the rock clamping action is lowered; in the rock block motion process after rock body crushing, rock blocks are mutually in collision, mutual rubbing happens, impact pressure and shearing force are generated, the rock blocks are crushed again, a rock block diameter reducing blasting method is provided, the blastedrock body crushing degree can be improved, the blasting vibration effect is reduced, harm to ground buildings is lowered, and mine safety is maintained.

The invention discloses a large-diameter offshore wind power rock-socketed single pile excavating method. The large-diameter offshore wind power rock-socketed single pile excavating method comprises the following steps that immersion of a pilot shaft pile casing is carried out; a petroleum drilling machine is adopted for excavating a pilot shaft through the pilot shaft pile casing; a geological drill is adopted for drilling two to three rings of main blast holes and one ring of outline blast holes, and a casing off hole is lowered down; a dedicated CO2 phase change expansion crack pipe is mounted, the interiors of the main blast holes are mounted in a segmented manner, and the interiors of the outline blast holes are continuously mounted; a blast network is connected; a rock-socketed single pile steel pile casing is lowered down; mud and weathering sand between the pilot shaft pile casing and the rock-socketed single pile steel pile casing are sucked away; the pilot shaft pile casing and a drilling casing pile are pulled out; underwater slag cleaning is carried out; and concrete is poured to form a rock-socketed single pile foundation. Pilot shaft mechanical excavating and CO2 expansion rock breaking and expanded excavating are combined, the technical problem that a 2-4mm-diameter petroleum drilling machine and a common geological drill are used for finishing excavating of an offshore rock-socketed single pile foundation with the diameter being 8 to 10 m and above can be solved, the expansion pressure generated by a CO2 phase change is controllable, the explosion impact waves and the vibration speed are small, and the method is economic and environment-friendly.