Tunnel hole distributing explosion method

Abstract

The invention provides a tunnel hole distributing explosion method. The method comprises the steps that a shot hole is formed, charging is performed at a hole site, and shot hole explosion is performed; during hole site charging, charging is performed on side wall peripheral holes and tunnel bottom peripheral holes according to pre-cracking explosion, charging is performed on tunnel arch peripheral holes according to polished explosion, and the side wall peripheral holes, the tunnel bottom peripheral holes and the tunnel arch peripheral holes are each of a non-coupled charging structure; during shot hole explosion, the side wall peripheral holes, the tunnel bottom peripheral holes, the lower middle breaking-in holes, the tunnel bottom auxiliary holes, the tunnel bottom lifting cannons, theupper middle breaking-in holes and the tunnel arch peripheral holes are subjected to explosion according to the sequence. According to the tunnel hole distributing explosion method, in the explosionprocess, the partition explosion sequence is controlled so as to effectively control the back-break range value obtained after tunnel explosion, meanwhile, it is ensured that the whole wheel contour is smooth and flat after tunnel peripheral hole explosion to the maximum extent, disturbance to peripheral breaking surrounding rock during explosion is greatly lowered, and the whole explosion effectis safe and stable.

Description

technical field [0001] The invention relates to the technical field of tunnel construction, in particular to a blasting method for laying holes in a tunnel. Background technique [0002] Existing mountain tunnel engineering excavation and blasting generally adopts smooth blasting technology, which mainly adopts sub-regional and segmental differential blasting, so as to achieve that the contour line after blasting meets the design requirements and the air surface is smooth and regular. Usually, the blasting construction for the face of the tunnel is mainly to blast the rock mass at the excavation part of the main body of the tunnel first, and then detonate the peripheral charges arranged on the design contour line to blast off the light blasting layer to form a smooth excavation noodle. [0003] In the entire tunnel construction operation, the quality of the blasting excavation method plays a decisive role in the blasting excavation speed of the tunnel. At the same time, the...

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Problems solved by technology

[0004] Furthermore, with the high standard requirements of high-speed rail construction, traditional light blasting technology (generally, over- and under-excavation is controlled at 10 cm to 20 cm) has been difficult to meet the high-standard tunnel contour requirements at the construction site (over- and under-excavation is controlled at 5 cm), and the traditional smooth blasting is difficult to form a light blasting effect on the entire broken surrounding rock, and its applicability is poor, especially the over-excavation at the tunnel spandrel and the foot of the side wall is particularly serious. Even during the blasting process, the auxiliary eye and Poor cutting blasting effect will cause disturbances to the surrounding rocks after the surrounding holes are detonated one after another, increasing dangerous rocks and falling blocks, and causing great safety hazards

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