Hard rock pre-damage and rupture method based on high-voltage pulse electrical explosion

Abstract

The invention discloses a hard rock pre-damage and rupture method based on high-voltage pulse electric explosion. and belongs to the technical field of rock mass rupture. The hard rock pre-damage andrupture method comprises the following steps: 1, two holes, namely a first drill hole and a second drill hole, are drilled in a to-be-ruptured rock mass; 2, the first discharge electrode bottom end ofof a first discharge electrode is inserted into the first drill hole, and the second discharge electrode bottom end of a second discharge electrode is inserted into the second drill hole; and 3, if the first discharge electrode and the second discharge electrode are inserted into the hole bottoms firstly when inserted into the first drill hole and the second drill hole for the first time, rock mass pre-damage operation is conducted, and if the first discharge electrode and the second discharge electrode are inserted into the edges of orifices firstly when inserted into the first drill hole and the second drill hole for the first time, rock mass breaking operation is conducted. The method is safe, reliable, environment-friendly and efficient, and can be suitable for various scenes such asrock pre-damage of hard boulders, mine field mining and mine field rock large block crushing during excavation of a shield tunneling machine.

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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