Method for achieving blasting excavation of large-section tunnel with area larger than 400 m2 or above based on electronic detonator

Abstract

The invention relates to a method for achieving blasting excavation of a large-section tunnel with the area larger than 400 m2 or above based on an electronic detonator and belongs to the field of tunnel blasting construction. The blasting excavation method comprises the five stages of a climbing uplifting section, a transverse expanding excavation section, a reverse excavation construction section, an over-excavation backfill section, a residual rock mass and large-section inverted arch treatment. The climbing uplifting section adopts a common detonator controlled blasting technology, and thetransverse expanding excavation section and the reverse excavation construction section both adopt a digital detonator hole-by-hole blasting technology. According to the method, the requirements forlow vibration speed precise control, high circulating footage and safe construction can be met at the same time in ultra-large section blasting construction.

Description

technical field [0001] The invention relates to the field of tunnel blasting construction, in particular to a method for realizing 400 m based on an electronic detonator 2 The above large-section tunnel blasting and excavation methods are mainly aimed at the blasting and excavation projects of super large-section bifurcation tunnels. Background technique [0002] With the progress of the times and society, the current highway and railway tunnels tend to build multi-lane (more than three lanes) expressways, and the construction of underground stations is developing towards a wider and more comfortable direction. Therefore, large-section tunnels and the accompanying tunnel construction will become normal. Generally speaking, the four-lane section is mostly 200m 2 Left and right, if the cross-section of the parallel line in the tunnel is larger, it is generally considered to be greater than 100m. 2 It belongs to the highest-level extra-large section, and the current 200m in ...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the above technical problems, the present invention provides an electronic detonator based on 400m 2 The blasting excavation method for large-section tunnels above solves the problems that traditional blasting methods for large-section tunnels are difficult to meet the requirements of vibration velocity control and construction progress, and low efficiency.

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