Rapid construction smooth blasting method for half-section micro-step

Abstract

The invention relates to the technical field of tunnel engineering, and discloses a rapid construction smooth blasting method for a half-section micro-step. The rapid construction smooth blasting method comprises the following steps that a constructor formulates an excavation scheme according to surrounding rock conditions, and peripheral holes and auxiliary holes are formed by using an excavationdrilling trolley according to the excavation scheme. According to the rapid construction smooth blasting method for the half-section micro-step, multiple groups of slotting holes are formed, wedge-shaped slotting, multiple wedge-shaped slotting or straight hole layered slotting or spiral slotting is adopted for the slotting holes, and under the condition that the number of detonator sections is enough, part of rock mass at the slotting part should be blasted, so that slotting is easy to take out, the slotting effect can be guaranteed, the single-section dosage of slotting can be reduced, andthe vibration reduction effect can also be guaranteed; and by the adoption of the non-electric millisecond-level or semi-non-electric millimeter-level delay detonators and the detonating cords, the time difference requirement, namely the shock absorption requirement, can be met, meanwhile, operation is convenient, and stability is high.

Description

technical field [0001] The invention relates to the technical field of tunnel engineering, in particular to a smooth surface blasting method for rapid construction of half-section micro-steps. Background technique [0002] A tunnel is a building built underground or underwater or in a mountain, laying a railway or building a road for the passage of motor vehicles. According to its location, it can be divided into three categories: mountain tunnels, underwater tunnels and urban tunnels. In order to shorten the distance and avoid large ramps, it is called a mountain tunnel that passes under mountains or hills; in order to cross rivers or straits, it is called an underwater tunnel that passes under a river or under the sea; in order to meet the needs of railways passing through large cities, it is called a tunnel. Those that pass underground are called urban tunnels. Among these three types of tunnels, mountain tunnels are the most constructed. [0003] In the prior art, the...

AI Technical Summary

Problems solved by technology

When explosives explode in the rock mass, while blasting the rock within the excavation range, it will inevitably cause damage and destruction to the retained rock mass, thus affecting the stability of the engineering rock mass

The impact of blasting on the stability of engineering rock mass is mainly reflected in two aspects: one is to deteriorate the mechanical properties of the rock and reduce the strength and elastic modulus of the rock; the other is to generate cracks in the surrounding rock or expand the original cracks in the surrounding rock. etc., thereby affecting the integrity of the rock mass, the above two aspects will reduce the basic quality indicators of the rock mass, thereby affecting the stability of the surrounding rock

The degree of impact of blasting excavation on engineering rock mass is directly related to the blasting method and blasting parameters adopted. Reasonable selection of blasting methods and blasting parameters can minimize the damage of blasting to surrounding rock. When excavating rocks by blasting, over- and under-excavation are prone to occur, resulting in a decrease in construction efficiency and an increase in construction costs. Therefore, we propose a smooth blasting method for rapid construction of half-section micro-steps

Images