Step blasting method with high energy utilization rate

Abstract

The invention discloses a bench blasting method with a high energy utilization rate. Blasting is carried out by optimizing a middle air interval charging structure. According to middle air interval charging structure optimization, rock mass parameters and explosive types are considered, the upper and lower limit values of hole wall pressure are determined according to the preset radius ranges of a blasting smashing area and a fracture area, and the length range of an air section is determined according to the pressure values; and in the determined air section length range, according to the set step length increment, calculating the air section length value corresponding to the hole wall pressure value corresponding to the maximum value of the ratio of the energy consumed by the radial crack to the total explosion energy and the ratio of the energy consumed by the explosion cavity area to the total explosion energy, and taking the air section length value as the optimal air section length. According to the method, the middle air interval charging structure is optimized under the condition that parameters such as the exploded rock mass, drilling and charging are considered, the crushing efficiency and the energy utilization rate of the upper rock mass and the lower rock mass can be improved at the same time, and the chemical consumption and the engineering cost are reduced. And the overall blasting effect and the capacity utilization rate of bench blasting are effectively improved. And the engineering adaptability is wide.

Description

technical field [0001] The invention belongs to the technical field of step blasting construction, in particular to a step blasting method with high energy utilization rate. Background technique [0002] Air-spaced charge technology is widely used in bench blasting construction. In the process of blasting, air-spaced charge technology not only reduces the peak value of blast pressure, avoids the crushing effect of shock waves on surrounding rock, but also prolongs blast pressure action time , to obtain a larger impulse (the product of the detonation pressure and the action time of the detonation pressure), thereby reducing the unit consumption of explosives and engineering costs, and improving the effective energy utilization rate of blasting. [0003] There are three common axial air-spaced uncoupled charges: top air-spaced charge, middle air-spaced charge, and bottom air-spaced charge. The top air-spaced charge often produces large blocks at the orifice; the bottom air-sp...

AI Technical Summary

Problems solved by technology

However, the existing blasting technology with central air compartment charge only selects the ratio of the air section based on engineering experience to determine the length of the air section. There is no specific method for the structure of the charge, and there is no method for optimizing the charge structure of the middle air interval to determine the optimal length of the air section and maximize the energy utilization rate for different blasted rock masses, drilling and charge parameters.

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