Deep-hole multi-point air-spaced water-uncoupled electric rock blasting method for subway hard rock

Abstract

The deep-hole multipoint air-spaced water-uncoupled electric rock blasting method for subway hard rock is characterized in that blast holes are formed in a hard rock stratum, an electric explosion loading pipe is prepared, and a plurality of functional layers are longitudinally divided; and S7, the electric energy is converted into high-pressure explosion type mechanical energy, the energy is continuously radiated outwards, multi-point multi-layer high-energy flow are quickly formed around each water storage device, and the multi-point multi-layer high-energy flow is preferentially applied tothe corresponding blast hole wall through an electric explosion loading pipe to generate multi-point multi-layer hole wall shock wave pressure, meanwhile, the discharge radiation energy is promoted toexpand and uniformly fill the whole blast hole through an air non-coupling gap between the electric explosion loading pipe arranged on a positioning system and the inner wall of the blast hole and acts on the wall of the blast hole to generate hole wall shock wave pressure, and under the combined action of an air non-coupling and water non-coupling energy-gathering fracturing structure, therefore, the high-energy flow at each water storage device preferentially breaks through the ultimate bearing strength of the hole wall rock mass, and multi-point, multi-layer and full-depth accurate rock breaking is realized in different depth ranges in the hard rock stratum.

Description

technical field [0001] The application belongs to the technical field of electric blasting rock in urban subway hard rock formations, and in particular relates to a deep-hole multi-point air-interval water-uncoupled electric blasting rock device for subway hard rock. Background technique [0002] In the construction of urban subway hard rock tunnels, when the uniaxial compressive strength of the rock exceeds 100MPa, in order to avoid the wear or damage of the high-strength hard rock on the composite shield tool and improve the tunneling efficiency, the traditional drill and blast method is usually used for tunnel excavation. . Since urban subway construction is generally located in the center or suburbs of the city, the mining tunnel blasting construction can easily affect the surrounding historical relics, existing lines, old buildings and the lives of the surrounding residents. In order to reduce the impact, the existing research is mainly to control the time period of th...

AI Technical Summary

Problems solved by technology

In order to reduce the impact, the existing research is mainly to control the time period of the blasting construction, choose different construction techniques for upper and lower steps and fine blasting techniques, etc., but all of these are due to the large potential risk factor of explosives and the damage of existing structures due to vibration, flying stones, and shock waves. And the human body and mind are affected, so its application in urban subways is limited

At the same time, in the drilling and blasting construction of existing urban subway tunnels, the effective depth of the blast hole is generally not more than 5m, and the blast hole is charged by directly placing multiple charges in the blast hole directly in contact with the rock surface of the hole wall based on the experience of the workers. Since the diameter of the charge is smaller than the diameter of the blasthole, the gap between the surface of the charge and the inner wall of the blasthole is unevenly distributed, causing the detonation to gradually weaken or even be interrupted, so that the energy cannot be fully utilized, often causing tunnel damage. over- and under-excavation and surrounding rock damage, and it is not conducive to increasing the tunnel scale and construction progress

Therefore, in the prior art, there is no systematic research on electric blasting of rock formations in urban subway hard rock formations, and there is no electric blasting rock formation device and method involving the combination of air-uncoupled structure and water-coupled structure for subway hard rock formations with deep holes and multiple points. Research

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