Low-angle dip stratified rock mass misfire-detonation-preventing blasting method

A gentle inclination, layered technology, applied in blasting and other directions, can solve problems such as high block rate, potential safety hazards, over-under-digging, etc., to achieve the effects of simple operation, improved safety, and reduced mutual misalignment

Active Publication Date: 2019-05-10
WUHAN UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If the conventional hole layout method, charge method and detonation method are adopted, after the explosive is detonated, the explosion load pushes the surrounding rock mass, causing the rock mass around the subsequent blast hole to stagger. The distance easily exceeds the blasting distance, resulting in blast rejection; as a result, severe over-under-excavation occurs in the blast area, the rock mass is not ful...

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  • Low-angle dip stratified rock mass misfire-detonation-preventing blasting method

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Embodiment Construction

[0027] Below by embodiment, in conjunction with accompanying drawing, technical scheme of the present invention is described further in detail:

[0028] The floor of a water cushion pond downstream of a high arch dam was excavated. The lithology of the water cushion pond floor is columnar joint basalt, with well-developed joint surfaces, and part of it is breccia lava. At 2.0m-4.0m and 5.5m-6.0m of the rock mass, there are hard breccia lavas with a thickness of about 2.0m and a thickness of about 0.5m. The rock quality of this rock formation is complete and hard. Blasting hole diameter is 76mm, blasting hole depth is 6.0 / 5.5m, plugging length is 1.0m, hole spacing is 1.0m, row spacing is 1.0m, Φ32 2# rock emulsion explosive is used, charge is not coupled, and the coil density is 0.95~1.30g / cm 3 , Sacrifice explosion distance 4cm. Specifically include the following steps:

[0029] 1. According to the previous geological exploration data, it is determined that there is a lay...

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Abstract

The invention provides a low-angle dip stratified rock mass misfire-detonation-preventing blasting method. Due to geological forecast and drilling process recording, a rock stratum distribution figureof a blasting area is drawn; quincunx hole distribution is adopted, the bottoms of adjacent blast holes are drilled in different rock stratum faces, and meanwhile, a certain number of empty holes aredistributed in the blasting area; hole openings and the hole bottoms are each provided with an initiation point, a detonating cord penetrates through whole powder charge, the cartridge joint avoids the rock stratum interface, and it is guaranteed that upper and lower layer cartridges are in close contact and are on one straight line; and a quincunx or V-shaped initiation manner is adopted for performing initiation. According to the low-angle dip stratified rock mass misfire-detonation-preventing blasting method, by improving the charge structure and optimizing the initiation manner, the problem that in the blasting process of a low-angle dip stratified rock mass, due to the mutual diastrophism of the rock stratum, the misfire-detonation problem of explosives is caused can be solved, the boulder yield of hard rock stratum blasting is reduced, under excavation of a foundation surface is avoided, the safety of a blasting network is improved, and fast construction is facilitated.

Description

technical field [0001] The invention belongs to the technical field of water conservancy and hydropower engineering, and in particular relates to a blasting-proof blasting method for layered rock mass with a gentle dip angle, and is particularly suitable for blasting areas where there are layered rock masses with a gentle dip angle and part of the rock stratum with well-developed joint surfaces. Background technique [0002] Drilling and blasting, as an economical and efficient means of rock mass excavation, has been widely used in various basic engineering constructions and mining of mineral resources. With the continuous development of drilling equipment and transportation tools, the advantages of blasting excavation, such as high production efficiency, low cost and easy use of comprehensive mechanized construction, have gradually attracted people's attention. However, in step blasting, blastholes often pass through rock formations with different lithologies, as well as fa...

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Application Information

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IPC IPC(8): F42D3/04F42D1/00F42D1/08F42D1/04
Inventor 严鹏刘晓杨支跃谭尧升杨静高世奎张伟迪
Owner WUHAN UNIV
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