Shock-absorbing blasting method used for bedding rock cutting excavation

Abstract

The invention discloses a vibration-reducing blasting method for the excavation of bedding rock cutting, which comprises the following steps: (1) the excavation section of the cutting is divided into a main excavation area (11), and a protective layer (12) is reserved between the main excavation area (11) and an excavation boundary (13); (2) the deep hole blasting is implemented for the main excavation area (11); (3) after the main excavation area (11) is excavated, the small-bench smooth surface blasting cleaning is implemented for the protective layer (12). The invention has the advantages of preventing the destabilization landslide of the bedding rock slope in the blasting process or preventing the over-deep blasting layer crack from influencing the stability of the slope, being used to the blasting construction of the bedding rock slope of a low dip angle and a moderate dip angle, effectively controlling the generation of the blasting layer crack and keeping the self-stabilization capacity of the slope, ensuring the safe construction of the slope, and reducing the costs of reinforcing and maintaining the slope.

Description

technical field [0001] The invention relates to a blasting construction method in road slope excavation engineering, in particular to a shock-absorbing blasting method for excavating bedding rock road cuttings. Background technique [0002] The bedding rock slope refers to the slope formed by excavating cuttings in the natural layered rock mass. At this time, the slope surface and the rock layer have the same inclination but intersect with each other at a small angle, and the intersection angle is generally less than 35°. When excavating a slope in a layered rock mass with a gentle dip angle and a medium dip angle, the slope angle is greater than the layer dip angle, which will cut off the rock formation and form an unstable slope. [0003] At present, the excavation of bedding rock slopes usually adopts the medium-deep hole or deep hole step blasting method to form the cutting at one time. Due to the effect of blasting and earthquakes, these methods are likely to cause par...

AI Technical Summary

Problems solved by technology

Due to the effect of blasting and earthquakes, these methods are likely to cause partial or overall spallation of the bedding rock cutting slope rock mass, destroy the integrity of the original rock, and reduce the self-stabilizing ability of the rock mass (the slope anti-sliding force decreases ), may even lead to landslides or collapses of existing road cuttings

This not only affects the smooth progress of the construction, but also increases the difficulty of the support and protection construction and increases the project cost.

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