A construction method of tunnel blasting in complex layered rock strata

Abstract

The invention discloses a construction method for tunnel blasting in complex layered rock formations, and relates to the technical field of tunnel blasting construction. The key points of the technical scheme are: 1) arranging blasthole drilling positions, and drilling; 2) while drilling, Record the feed displacement and drilling time of the drill bit in real-time during the drilling process, and analyze and calculate the texture strength of rock formations at different positions in the blasthole borehole; 3) according to the texture strength of rock formations at different positions in step 2), Analyze and calculate the amount of explosive filling in different positions in the borehole; 4) According to the amount of explosive filling in step 3), the emulsion explosive is fixed in sections at the corresponding position in the energy-collecting tube and then plugged into the borehole; 5) Seal the hole, Connect the lead to detonate. The amount of blasting charge can be designed according to the strength of the rock formation, so that the blasting can easily form a pre-designed cross-sectional shape and prevent over- and under-excavation phenomena; at the same time, it saves blasting materials, reduces blasting construction costs, and reduces the impact of tunnel excavation on the surrounding rock of the tunnel. disturbance damage.

Description

technical field [0001] The invention relates to the technical field of tunnel blasting construction, more specifically, it relates to a construction method of tunnel blasting in complex layered rock formations. Background technique [0002] my country is a mountainous country, mountains and hills occupy about 70% of the country's land area, and it is also a country with a large population. In order to meet the growing needs of social and economic development, my country has continuously developed tunnels and underground spaces. develop in depth. In nature, sedimentary rocks with layered structure account for two-thirds of the land area, and many metamorphic rocks also have layered structure characteristics, so humans will encounter the stability of layered rock mass when building underground projects. Layered rock mass refers to a rock mass that has a group of structural planes (such as bedding, schistosity, etc.) that dominate. They are one of the typical complex rock masse...

AI Technical Summary

Problems solved by technology

However, when layered rock mass is excavated and blasted for tunnel excavation, due to the existence of layers, the anisotropy of the rock mass is very significant, and the discontinuity of the surrounding rock is caused. The expansion of the management surface leads to the spalling of the rock strata, and it is difficult to form the pre-designed cross-section shape, resulting in extremely serious over- and under-excavation phenomena. This not only consumes more blasting and support materials, slows down the construction progress, but also disturbs the surrounding rock sexually impaired

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