A Blasting Excavation Method for Slope Rock Mass Containing Deep Fissures

Abstract

The invention discloses a method for blasting and excavating rock masses of slopes containing deep fissures. Including: drilling and obtaining the distribution of joints and fissures. According to the distribution of the fissure area in the blast hole, the blast hole passing through the fissure area is divided into a lower coupling charge section, a weakened charge section in the fissure area, and an upper conventional charge section. Charge the blastholes, block the blastholes, and detonate in a network. The blastholes with joints and fissures connected to each other are networked and detonated in sections. The rest of the blastholes are detonated in a conventional network. The invention adopts staged charge, the charge is weakened in the fissure area, and rock cuttings are used to fill the interval between the explosive roll and the wall of the blast hole, which can prevent the explosive gas from leaking prematurely through joint fissures, and is beneficial to improve the peak pressure of the explosive gas and its duration. time, and is conducive to giving full play to the "gas wedge" effect of the detonation gas; grouping the blastholes connected to each other with joints and fissures to detonate in groups and networks can avoid the adverse effects of the first blasting blastholes on the subsequent blastholes through the joints and fissures, thereby avoiding The occurrence of an explosion rejection accident.

Description

technical field [0001] The invention belongs to the technical field of engineering blasting, can be applied to the blasting and excavation operation of a slope rock mass with developed joints and fissures, and relates to a blasting and excavation method for a slope rock mass containing deep cracks. Background technique [0002] There are many mountain ranges in my country, which are especially widely distributed in the western region. With the continuous development of the national economy, various engineering constructions extend to the western region. When various engineering constructions are carried out in the alpine valleys, the blasting excavation of the slope rock mass is essential. Under the action of various geological structures and long-term physical, chemical and biological weathering and erosion, there are usually a large number of fractures in the rock body. It is generally believed that the rock breakage under blasting is the result of the combined action of ...

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Problems solved by technology

[0003] Grouting the rock mass requires additional drilling of grouting holes, which increases the working time of the drilling rig, and when the blasting area is large, the number of grouting holes and the amount of grout required to be drilled are large, which increases the cost and economy of the project. Poor; pouring cement slurry in the blast hole, the space is narrow, the construction operation is inconvenient, and it is difficult to guarantee the filling effect of the tiny cracks around the blast hole; the method of putting explosives into the PE soft water pipe needs to cut the water pipe according to the depth of the blast hole and Bind the lower end of the water pipe, which brings great inconvenience to the charging process

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