Stress slant symmetrical type deeply buried tunnel rock burst removing time-share blasting method

Abstract

The invention relates to a stress slant symmetrical type deeply buried tunnel rock burst removing time-share blasting method. The stress slant symmetrical type deeply buried tunnel rock burst removing time-share blasting method aims at controlling rock burst and solving the problems of construction safety and construction schedule caused by rock burst. The technical scheme is that: a, successively arranging a hole I, a hole II and a hole III on the hole tope along a stress concentrated area side, arranging a hole VI, a hole VII and a hole VIII on the hole foot along the stress concentrated side, and arranged a hole IV and a hole V in the middle; b, loading explosive in the hole I, the hole II and the hole III at a depth range 0.5-1m and 2.5-3m from the hole openings; loading explosive in the hole IV, the hole V and the hole VI in whole journey mode; and loading explosives in the hole VII and the hole VIII at a depth range 0.5-1m and 2.5-3m from the hole openings; c, firstly firing explosives in the hole I, the hole II, the hole III, the hole VII and the hole VIII at the 2.5-3m depth range, then firing the explosives in the 0.5-1m depth range, and at last firing the hole IV, the hole V and the hole VI and deslag; and d, successively repeating the steps a, b and c till an excavation face is completely through the hole stress concentrated area. The stress slant symmetrical type deeply buried tunnel rock burst removing time-share blasting method is suitable for stress slant symmetrical type deeply buried tunnels.

Description

technical field [0001] The invention relates to a time-sharing blasting method for rock blast relief in a stress obliquely symmetrical deep tunnel, which is mainly applicable to underground projects such as water conservancy and hydropower projects, transportation, mines, etc., and is particularly suitable for stress obliquely symmetrical deep tunnels. 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. When a rockburst occurs, the vibration is strong, the duration is long, and the damage range is large, which becomes the key factor controlling the safety of the project, the progress of the excavation, and even the success or failure. In the excavation of underground caverns,...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a time-sharing blasting method for removing rockbursts in obliquely symmetrical stress-type deep tunnels in order to solve the problem of obliquely symmetrical rockbursts in the excavation process of deep-buried tunnels (tunnels and roadways), Change the properties of the rock mass at a relatively low cost, reduce or eliminate the degree of energy accumulation, in order to achieve the purpose of controlling rock bursts, and solve the construction safety and construction progress problems caused by strong rock bursts

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