Water injection drilling and blasting method for unloading stress of structural strong rock burst area of horizontal structural surface

Abstract

The invention relates to a water injection drilling and blasting method for unloading the stress of a structural strong rock burst area of a horizontal structural surface. The invention aims to provide the water injection drilling and blasting method for unloading the stress of the structural strong rock burst area of the horizontal structural surface, so as to reduce or eliminate the rock burst energy and achieve the purpose of controlling rock burst. The technical scheme of the invention is as follows: (1) a group of uniform and symmetric blasting holes including top holes, middle upper holes, middle holes, bottom holes and side holes are drilled on an excavation surface; (2) the excavation surface is cleaned by clean water for once every 10 minutes, and water is injected into all the blasting holes every time for 2 minutes during that period of time; (3) explosive is charged in the width range from 0.8m to 1.2m at the bottoms of the top holes, in the whole processes of the middle upper holes, the middle holes and the bottom holes, and in the width range from 0.8m to 1.0m at the bottoms of the side holes; (4) the middle holes and the bottom holes are blasted, and then other holes are blasted; and (5) the steps (1), (2), (3) and (4) are repeated in sequence, until the excavation surface fully penetrates through the whole horizontal structural surface. The water injection drilling and blasting method for unloading the stress of the structural strong rock burst area of the horizontal structural surface is applicable to water conservancy and hydropower projects, traffic, mine and other underground projects.

Description

technical field [0001] The invention relates to a stress unloading water injection drilling and blasting method in structural strong rockburst areas of transverse structural planes, which is mainly applicable to underground projects such as water conservancy and hydropower projects, transportation, mines, etc., and is especially suitable for structural strong rockburst areas of transverse structural planes. Background technique [0002] Rockburst is the destruction of surrounding rock caused by the sudden release of potential energy or strain energy accumulated in the rock mass during the excavation process of underground engineering, which can lead to casualties, damage to the working face or equipment, and its basic characteristics are sudden and violent. The transverse structural plane of the rock mass means that the direction of the structural plane intersects with the direction of the cave at a large angle, generally the intersection angle is between 60° and 90°. The in...

AI Technical Summary

Problems solved by technology

[0003] So far, in the construction of deep underground projects in the world, there is still no fixed construction control method for structural rockburst on transverse structural planes, and the control of structural rockbursts on transverse structural planes in China is basically still in a blank state.

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