Rock mass blasting method

A technology of rock mass and pre-splitting blasting, which is applied in the field of blasting technology in open-pit mines or geotechnical engineering, can solve problems such as low half-wall porosity and poor excavation surface, and achieve the goals of reducing blasting costs, ensuring blasting safety, and maintaining stability Effect

Pending Publication Date: 2022-01-07
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, for strata with complex geological conditions and easy to collapse, each blast hole is filled with explosives for pre-splitting blasting. This method of mining strata with complex geological conditions results in low half-wall porosity and poor excavation surface

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0037] As an implementation manner of an embodiment of the present invention, the depth of the pre-explosion hole is (H / sinα)+k2, wherein the value of k2 is 0-1m.

[0038] As an implementation manner of an embodiment of the present invention, the diameter of the pre-explosion hole is 30-300mm.

[0039] S2, filling explosives and fillers into the pre-blasting holes at the junction, and performing pre-split blasting;

[0040] image 3 Schematic diagram of the structure for charging and packing the pre-blast hole, combined with image 3 The lower part of the pre-explosion hole 4 is equipped with an explosive 5, the upper part of the pre-explosion hole 4 is equipped with a stuffing 6, and the stuffing 6 and the explosive 5 run through a detonating cord 7.

[0041] As an implementation manner of an embodiment of the present invention, the charge uncoupling coefficient of the pre-detonation hole is 2-5.

[0042] The charge uncoupling coefficient refers to the ratio of the blast h...

Embodiment 1

[0056] 1. Investigation of blasting environment and defects

[0057] The Shuichang Iron Mine of the Mining Company of Shougang Group Co., Ltd. is a deep concave open-pit iron mine. It is in the final stage of open-pit mining. The stope space is narrow and the terrain and geological conditions are complex. More than 90% of the surrounding areas need to implement controlled blasting to control blasting vibration and blasting backlash. , the adjacent side walls need to be pre-splitting blasting, the hardness coefficient of the rock mass is f=8-12, the lithology is mixed granite, gneiss and magnetite quartzite, and more than 50% of the rock mass joints and fissures are relatively developed or the hydrogeological conditions are complex.

[0058] 2. Determination of pre-explosion holes and empty holes

[0059] (1) Determine the distance (a) between adjacent pre-blasting holes. Based on the physical and mechanical properties of the rock and soil to be blasted and the geological and t...

Embodiment 2

[0072] 1. Investigation of blasting environment and defects

[0073] The Shuichang Iron Mine of the Mining Company of Shougang Group Co., Ltd. is a deep concave open-pit iron mine. It is in the final stage of open-pit mining. The stope space is narrow and the terrain and geological conditions are complex. More than 90% of the surrounding areas need to implement controlled blasting to control blasting vibration and blasting backlash. , the adjacent side walls need to be pre-splitting blasting, the hardness coefficient of the rock mass is f=8-12, the lithology is mixed granite, gneiss and magnetite quartzite, and more than 50% of the rock mass joints and fissures are relatively developed or the hydrogeological conditions are complex.

[0074] 2. Determination of pre-explosion holes and empty holes

[0075] (1) Determine the distance (a) between adjacent pre-blasting holes. Based on the physical and mechanical properties of the rock and soil to be blasted and the geological and t...

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Abstract

The invention discloses a rock mass blasting method, and relates to the technical field of surface mine or geotechnical engineering blasting processes. The method comprises the following steps that a plurality of empty holes and a plurality of pre-blasting holes are arranged at the junction of a protected area and a to-be-blasted area, the plurality of pre-blasting holes at the junction are sequentially arranged at intervals, at least one empty hole is formed between any two adjacent pre-blasting holes at the junction; and the pre-blasting holes at the junction are filled with explosives and stuffing, and pre-splitting blasting is carried out; and rock mass blasting is conducted on the to-be-blasted area obtained after presplitting blasting. By adopting the method provided by the invention, rock in the protected area can present a smooth and flat excavation surface, so that the blasting construction efficiency is improved, the blasting safety is ensured, the blasting cost is reduced, and the blasting control effect is improved.

Description

technical field [0001] The invention belongs to the technical field of blasting technology in open-pit mines or geotechnical engineering, and in particular relates to a blasting method. Background technique [0002] Rock mass blasting is a mechanical process in which explosives are used to apply loads to rock mass to destroy rock and soil. In mine development, it is necessary to adopt rock mass blasting technology for ore mining. In order to effectively limit the damage to the rock mass in the protected area in the blasting area, control blasting methods such as smooth surface, pre-splitting, and buffering are generally used. [0003] At present, for strata with complex geological conditions and easy to collapse, each blast hole is filled with explosives for pre-splitting blasting. This method mines strata with complex geological conditions, resulting in low half-wall porosity and poor excavation surface. Contents of the invention [0004] In order to solve the above-ment...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F42D1/00F42D3/04E21C37/00
CPCF42D1/00F42D3/04E21C37/00
Inventor 尹芝足蔡文华康福军安雄乜海军李红勇
Owner SHOUGANG CORPORATION
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