Method for assisting carbon dioxide directional blasting through ultrasonic excitation

Abstract

The invention discloses an ultrasonic excitation assisted carbon dioxide directional blasting method, belongs to the technical field of gas blasting, and particularly belongs to an ultrasonic excitation assisted carbon dioxide gas blasting directional fracturing rock mass method. Comprising seven steps of site selection, hole forming, ultrasonic excitation, hole washing, installation of carbon dioxide blasting cracking equipment, hole sealing and detonation. The invention discloses an ultrasonic excitation-assisted carbon dioxide directional blasting method, which comprises the following steps of: firstly, applying an ultrasonic excitation effect on a rock mass in a preset blasting excavation direction according to a design scheme, and performing advanced fracturing on the rock mass in the preset excavation direction of geotechnical engineering in advance, so as to reduce the dynamic property of the rock mass and promote the generation of an internal initial crack of the rock mass; according to the method, the dynamic property of the excavated rock mass can be directionally weakened, the crack initiation extension direction of rock mass explosion cracks is effectively controlled, the back break amount of the rock mass is reduced, and damage disturbance to the rock mass in a non-excavation area is weakened.

Description

technical field [0001] The invention relates to the technical field of liquid blasting, in particular to a method for ultrasonic excitation-assisted carbon dioxide directional blasting. Background technique [0002] With the development of my country's economy, people's demand for resources and space is increasing day by day, and more and more underground space projects have been put into construction. In the construction process of these underground space projects, it is very important to realize the safe and efficient excavation of underground rock mass, which has a great influence on the subsequent operations. Generally speaking, in the crushing and excavation of underground rock mass, on the one hand, the rock mass in the excavation area should be reasonably and effectively broken, and on the other hand, the damage to the rock mass outside the excavation area should be minimized as much as possible. This is the common goal pursued by the majority of scientific and techn...

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Problems solved by technology

It is difficult to effectively break some rock masses with high hardness coefficients by relying on this pressure

The second is that carbon dioxide blasting technology has relatively high requirements for blasting the air surface. In the absence of an air surface, the effect of carbon dioxide blasting is extremely poor, and it is difficult to achieve the purpose of effectively cracking rocks. This is why traditional carbon dioxide blasting technology is not applicable Important reasons for deep foundation pit excavation

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