A method of pre-damage and fracture of hard rock based on high-voltage pulse electric explosion

Abstract

The invention discloses a hard rock pre-damage and fracture method based on high-voltage pulse electric explosion, which is applied to the technical field of rock mass crushing and includes the following steps: 1. Drilling two holes in the rock mass to be broken, the first drilling hole and the second drilling hole. Two drill holes; 2. insert the first discharge electrode bottom of the first discharge electrode into the first drill hole, and insert the second discharge electrode bottom of the second discharge electrode into the second drill hole; 3. if the first discharge electrode and When the second discharge electrode is inserted into the first borehole and the second borehole for the first time, it is inserted into the bottom of the hole first, and the rock mass pre-damage operation is performed; if the first discharge electrode and the second discharge electrode are inserted into the first borehole and the second borehole for the first time , first insert the edge of the orifice to carry out the rock mass crushing operation. The invention is safe, reliable, green and efficient, and can be applied to many scenarios such as pre-damage of rocks encountered by hard boulders during excavation of shield machines, mining in mines, and breaking of large rocks in mines.

Description

technical field [0001] The invention relates to the technical field of rock crushing, in particular to an electric explosion rock breaking method based on high-voltage pulse discharge. Background technique [0002] Mechanical rock breaking is commonly used in rock breaking, such as shield machine blade cutting, drilling hammer crushing, etc., and chemical explosion rock breaking. For rocks with relatively hard textures, mechanical rock breaking is often difficult to break rocks, or the crushing efficiency is extremely low, the cost is high, the rock breaking process of chemical explosions is complicated, and explosives are strictly controlled, causing high safety risks and polluting the environment. Under certain conditions, the pulse high voltage generated by the high-voltage pulse device acts on both ends of the rock, which can cause the rock to crack. In the air, when the rock is directly inserted on the surface of the rock for rock crushing, because the conductivity of ...

AI Technical Summary

Problems solved by technology

For rocks with relatively hard texture, mechanical rock breaking is often difficult to break rocks, or the crushing efficiency is extremely low, the cost is high, the process of chemical explosion rock breaking is complicated, and explosives are strictly controlled, with high safety risks and environmental pollution.

Under certain conditions, the pulse high voltage generated by the high-voltage pulse device acts on both ends of the rock, which can cause the rock to crack. In the air, when the rock is directly inserted on the surface of the rock for rock crushing, because the conductivity of the rock is lower than that of the air, flashover along the edge will occur, and the plasma channel cannot be formed inside the rock. This discharge method cannot achieve the expected fracture effect.

[0003] The traditional electric crushing method is mostly a single discharge of the electrode, which can only cause a single damage to the rock. At present, due to the technical limitations of pulse power devices and high-voltage transmission cables, the damage area of ​​a single rock damage by electric crushing is limited. For large rocks Or ore body crushing efficiency is extremely low

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