A control method for deep hole blasting of adjustable pressure-bearing expansion plastic pipe

Abstract

The invention relates to a bearing pressure adjustable plastic expansion pipe deep hole blasting control method. An explosive is sealed in a bearing pressure adjustable plastic expansion pipe; a liquid, solid or solid-liquid mixed detonating medium is filled beside the explosive in the plastic expansion pipe; initial pressure of the bearing pressure adjustable plastic expansion pipe is set through the filled detonating medium; and detonation is conducted after blasting safety protection measures are taken. Air in the plastic expansion pipe is exhausted when the detonating medium is filled. According to the method, the characteristics of low compression performance of the detonating medium in a hole, high explosive energy utilization ratio and dilatation of the detonating medium are utilized to achieve the purpose of sufficient rock breaking; the explosive can be placed sectionally in the drill hole and detonated sequentially; an explosion wave front of the explosive acts on surrounding rock of the drill hole for many times for the sufficient rock breaking; simple change of an explosive loading mode of the plastic expansion pipe, positions and a detonation sequence can meet requirements of controlled blasting of hard rock; and the detonating medium can effectively reduce generated quantity of harmful blasting gas, and has significant cooling and dedusting effects.

Description

technical field [0001] The invention relates to an adjustable pressure-bearing blasting control method of expanding plastic, which relates to the problem of controlling pre-cracking and weakening of engineering rock mass drilling and blasting, and particularly relates to a pressure-bearing blasting control method of hard rock underground in a coal mine. Explosives in the borehole can be placed in sections and detonated sequentially. The explosive shock wave front acts on the surrounding rock of the borehole multiple times to fully break the rock. At the same time, the charging method, position and detonation sequence of the expanded plastic tube can be changed to meet the requirements of hard rock controlled blasting. Require. Background technique [0002] At present, for the excavation of hard rock roadways at home and abroad, especially for roadways with great changes in geological conditions, it is necessary to give full play to the rapid excavation effect of equipment in...

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Problems solved by technology

[0002] At present, for the excavation of hard rock roadways at home and abroad, especially for roadways with great changes in geological conditions, it is necessary to give full play to the rapid excavation effect of equipment in hard rock roadways. Drilling and blasting is one of the best methods to solve the problem; and For the hard roof with high strength, no joints and fissures, good integrity and strong self-stabilization ability in coal mine production, it is easy to form a large area of ​​suspended roof during the mining process of the working face. When the roof suddenly collapses in a large area, it is very easy to form hurricanes and Strong impact loads are likely to cause equipment damage and casualties, and it is easy to cause gas pressure to release and gushe out instantly, causing serious gas accidents. To achieve safe and efficient production at the working face, such roofs must be weakened. Drilling and blasting is a common method

[0003] However, at present, there are still some problems that need to be improved in the drilling and blasting technology itself. For example, the drilling integrity is relatively good under the hard rock condition, which easily leads to a large uncoupling space for the drilling charge, and the energy utilization rate of the explosive in the hole is low. Low, large amount of dust and harmful gas, relatively concentrated range of rock mass damage, poor overall control effect and other series of problems

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