Smooth surface blasting of circular chamber in gneiss area and step-by-step removal method of rockburst

Abstract

The invention relates to a gneiss area circular chamber smooth blasting and rockburst step-by-step removing method and aims at solving the problems about smooth blasting control and rockburst in the deeply-buried gneiss tunnel (tunnels and roadways) tunneling process. According to the technical scheme, a plurality of detonation holes are drilled near the center of the excavated tunnel face and the tunnel face of a circular chamber and are distributed on the circle with the center of the tunnel face as the circle point and the circle point, the hole depth of the detonation holes is 7 m, and charging is conducted within all the depth range; a plurality of smooth blasting control holes are drilled in the position, close to the boundary of the excavated tunnel face, on the excavated tunnel face of the circular chamber, the smooth blasting detonation control holes are evenly distributed in the circle with the center of the tunnel face as the center point, the hole depth of the smooth blasting detonation control holes is 10 m, charging is conducted at the positions, away from the tunnel face by 0-1m, 2-3 m, 4-5 m and 6-7 m, in the smooth blasting control holes, the charging sections are 1m in length, and the detonation strength is 0.04 kg / T. The gneiss area circular chamber smooth blasting and rockburst step-by-step removing method is applicable to hydraulic and hydro-power engineering, traffic, mines and other underground projects.

Description

technical field [0001] The invention relates to a method for smooth blasting of a circular chamber in a gneiss area and a step-by-step method for removing rock bursts. It is suitable for underground projects such as water conservancy and hydropower engineering, transportation, and mining. 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 and damage to the working face or equipment. Its basic characteristics are sudden and violent. As the name implies, smooth blasting is the construction of strict requirements and control of the blasting method, so that the chamber after blasting can avoid the undulation of the excavation surface as much as possible, so as to increase the workload in the later stage. In particular, the schism of the gneiss rock mass itself, the impact...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is: in view of the above-mentioned existing problems, provide a safe, reliable, low-cost, and fast construction progress circular chamber smooth surface blasting and rockburst removal method in gneiss area, in order to solve Smooth surface blasting control and rockburst problems during excavation of deep-buried gneiss tunnels (tunnels, roadways)

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