A blasting method for directional fracture and slotting of mixed wedge-shaped kerf charges in hard rock roadways

A technology of directional fracture and roadway, which is applied in blasting and other directions, can solve the problems of high rate of over-broken rock blocks, influence on construction progress, and heavy drilling workload, so as to achieve moderate construction difficulty and cost, increase aperture distance and Row spacing, effect of securing strength and stability

Inactive Publication Date: 2017-01-04
HENAN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, due to the difficulty of roadway blasting in hard rock (f=10-16), especially the large consumption of explosives in cutting blasting, the disturbance and damage to the surrounding rock of the roadway are large, and the maintenance and repair costs in the roadway operation stage are high; The quantity is large, and the drilling workload is large; and the utilization rate of blastholes is generally low, which can only reach about 50%; the rate of large pieces of rock bursting is high, the rate of excessively broken rock pieces is also high, and the efficiency of rock loading and transportation is low; thus making The blasting and excavation cycle time of the entire roadway is prolonged, which seriously affects the construction progress

Method used

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  • A blasting method for directional fracture and slotting of mixed wedge-shaped kerf charges in hard rock roadways
  • A blasting method for directional fracture and slotting of mixed wedge-shaped kerf charges in hard rock roadways
  • A blasting method for directional fracture and slotting of mixed wedge-shaped kerf charges in hard rock roadways

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Experimental program
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Effect test

Embodiment 1

[0021] Three to four pairs of vertical wedge cut holes are arranged in the middle of the tunneling face. Each pair of vertical wedge cut holes includes a mirrored primary cut hole 1 and a secondary cut hole 2 set on both sides. The first-level cut hole 1 is composed of three blast holes arranged side by side, the second-level cut hole 2 is composed of four blast holes arranged side by side, and the middle of the first-level cut hole 1 is provided with 1 ~2 straight holes 3, the hole distance between each two adjacent shot holes in the first-level cut hole 1 is 800-1000mm, and every two adjacent shot holes in the second-level cut hole 2 The hole distance between the holes is 300-400mm. When two straight holes 3 are arranged, the hole distance between the straight holes 3 is 300-500mm, and the distance between the first-level cut holes 1 is 800- 1000mm, the distance between the second-level cut holes 2 is 1200-1400mm, the second-level cut holes 2 adopt a coupled continuous charge...

Embodiment 2

[0025] Three to four pairs of vertical wedge cut holes are arranged in the middle of the tunneling face. Each pair of vertical wedge cut holes includes a mirrored primary cut hole 1 and a secondary cut hole 2 set on both sides. The first-level cut hole 1 is composed of three blast holes arranged side by side, the second-level cut hole 2 is composed of four blast holes arranged side by side, and the middle of the first-level cut hole 1 is provided with 2 Two straight holes 3, the hole distance between each two adjacent blast holes in the first-level cut hole 1 is 800-1000 mm, and each two adjacent blast holes in the second-level cut hole 2 The distance between the holes is 300-400mm, the distance between the straight holes 3 is 300-500mm, the distance between the first-level cut holes 1 is 800-1000mm, and the distance between the second-level cut holes 2 The distance between the two is 1200~1400mm, the second-level cut hole 2 adopts a coupled continuous charge, the straight hole...

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Abstract

The invention discloses a medium-length hole mixed wedge cut blasting method capable of realizing directed fracture using a cutting cartridge bag for a solid rock roadway. According to the method disclosed by the invention, 3-4 pairs of vertical wedge cutting holes are arranged at lower half places of an excavating working face; the vertical wedge cutting holes comprise mirror-arranged primary cutting holes and secondary cutting holes that are arranged at the two sides of the primary cutting holes; the primary cutting holes comprise three blast holes that are arranged side by side; the secondary cutting holes comprise four blast holes that are arranged side by side; 1-2 straight holes are formed in the middle portion of each primary cutting hole; a distance between every two adjacent blast holes in the primary cutting holes is 800-1000mm. According to the method disclosed by the invention, the advantage of directed fracture blasting of the cutting cartridge bag is fully utilized, so that an orifice distance and a row distance of the primary cutting holes are increased, the number of blasting holes is reduced, explosive unit consumption is decreased, disturbance damage to the roadway surrounding rocks by cut blasting is effectively controlled, the original strength and stability of the roadway surrounding rocks are guaranteed, and favourable conditions are provided for repairing and maintenance works during later roadway support and operation progresses.

Description

Technical field [0001] The invention relates to a medium and deep hole wedge-shaped cut blasting method for roadways, in particular to a directional fracture cut blasting method for medium and deep holes in hard rock (f=10-16) roadways with mixed wedge-shaped slitting cartridges. Background technique [0002] my country is rich in coal resources, widely distributed, and mainly underground mining. Key state-owned coal mines only have rock tunnel excavation works above 2000Km each year. Drilling and blasting is still the first choice for tunnel excavation construction. Medium-deep hole blasting can reduce auxiliary work time, increase single-cycle footage, save a lot of blasting equipment, accelerate the speed of roadway blasting and obtain better economic benefits, and is considered to be one of the most effective technical means to accelerate the speed of excavation. The development direction of tunnel blasting. [0003] At the same time, in tunnel blasting, cut blasting has alway...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F42D1/00F42D1/08
Inventor 褚怀保梁为民杨小林余永强王新生王金星王云飞陈峰宾王光勇王立平
Owner HENAN POLYTECHNIC UNIV
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