Rockblast stress relief water storage guide hole type blasting method for deep-buried round tunnel

Abstract

The invention relates to a rockblast stress relief water storage guide hole type blasting method for a deep-buried round tunnel. The method aims at controlling the rockblast and solves the construction safety and construction progress problems caused by strong rockblast. The method has the technical scheme that a, a group of water storage guide holes, a group of stress relief holes and a circle center hole positioned in the circle center part are respectively formed in the round digging surface; b, the digging surface is cleaned once by clean water every ten minutes, and the cleaning is carried out for three times; c, after water is fully filled into each water storage guide hole, gypsum clay is used for sealing and plugging the hole opening when a water pressure gun is removed; d, the whole-process powder charging is carried out in each stress relief hole and the circle center hole, the total blasting intensity is 0.05kg / T, then, all stress relief holes and the circle center hole are simultaneously initiated, and the slag tapping is carried out after the blasting completion; and e, the steps a, b, c and d are sequentially repeated until the whole stress concentration region is passed. The method is applicable to underground engineering of hydraulic and hydro-power engineering, traffics, coal mines and the like.

Description

technical field [0001] The invention relates to a rockburst stress-relief water storage guide hole type blasting method in a deeply buried circular tunnel, which is mainly applicable to underground projects such as water conservancy and hydropower projects, transportation, and mines. 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. Especially if you encounter a large circular excavation surface (such as a water diversion tunnel or a flood discharge tunnel), affected by its stress distribution characteristics, not only the top and side walls are prone to rockburst, but even the bottom of the cavern will crack. Causing deformation and collapse of the cavern, and even destroy...

AI Technical Summary

Problems solved by technology

[0003] So far, the prevention and control of rockbursts in circular underground caverns around the world is still in its infancy, and no fixed solution has been formed. Generally, the drilling and blasting method from the outside to the inside is adopted, step by step, which seriously affects the progress of the construction. , and the risk of using the drill and blast method in circular tunnels is relatively high, and effective rockburst control methods are basically blank

Images