Tunnel excavation blasting optimization method based on drilling energy dissipation monitoring

Abstract

The invention belongs to the field of tunnel engineering construction, and particularly relates to a tunnel excavation blasting optimization method based on drilling energy dissipation monitoring. S100, a dynamic pressure meter is installed on a drill rod clamp of the drilling machine, a stress sensor is installed on the bottom face of a drill bit of the drilling machine, and a displacement meter is installed at the tail end of a drill rod of the drilling machine; s200, the drilling machine drills, a displacement dynamic curve, a stress dynamic curve and a pressure dynamic curve are obtained through a displacement meter, a stress sensor and a dynamic pressure meter, then a drill bit stress along with displacement curve and a drill rod pressure along with displacement curve are obtained through a time corresponding relation, and basic data are provided for calculating rock breaking specific energy; s300, specific energy required for rock breaking of different depths of drill holes is calculated on the basis of the drill bit stress along with displacement and drill rod pressure along with displacement curves, and meanwhile a rock breaking specific energy-displacement diagram is obtained through calculation; s400, energy needed by single-hole blasting rock breaking is calculated; s500, the amount of explosive needed by a single hole is calculated; s600, the volume number of the needed explosive is calculated; and S700, explosive loading is conducted at intervals according to specific energy distribution required by rock breaking.

Description

technical field [0001] The invention belongs to the field of tunnel engineering construction, in particular to a tunnel excavation blasting optimization method based on drilling energy dissipation monitoring. Background technique [0002] In recent years, my country's infrastructure projects have been launched on a large scale, and tunnel engineering is a very important part of infrastructure projects. The excavation methods in tunnel engineering construction are usually divided into manual excavation, mechanical excavation and blasting excavation. Blasting excavation has low construction costs. The distinctive features of it, so it is usually used in mountain tunnels. The blasting method of blasting excavation depends on the physical and mechanical properties of the rock mass. Usually, the blasting design is based on the engineering rock mass classification. However, this design method is too rough and cannot accurately reflect the inhomogeneity and variability of the rock m...

AI Technical Summary

Problems solved by technology

The blasting method of blasting excavation depends on the physical and mechanical properties of the rock mass. Usually, the blasting design is based on the engineering rock mass classification. However, this design method is too rough and cannot accurately reflect the inhomogeneity and variability of the tunnel face rock mass, resulting in blasting The phenomenon of over-excavation and under-excavation not only wastes explosives, but also causes poor stability of the tunnel, or additional construction such as subsequent re-excavation, filling grouting, etc. is required

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