High-pressure water injection device and its construction method for relieving the risk of fracture-slip rockburst

Abstract

The invention relates to a breakage and slippage type rockburst risk relieving high-pressure water injection device and a construction method of the breakage and slippage type rockburst risk relieving high-pressure water injection device. According to the breakage and slippage type rockburst risk relieving high-pressure water injection device and the construction method, surrounding rock stress in a breakage zone and the energy concentration degree are reduced through high-pressure water injection, and rockburst risks are effectively removed. According to the technical scheme, the breakage zone deep buried into underground surrounding rock is arranged in front of a tunneling tunnel, two to three water injection drilling holes which are in large-angle intersection with the breakage zone are drilled from the tunneling tunnel to the breakage zone, and the water injection drilling holes penetrate through the breakage zone by 1 m to 2 m. A high-pressure water injection steel tube is placed in each water injection drilling hole, it is guaranteed that the length of the water injection steel tubes at hole opening sections is 2 m, and the hole opening sections of the high-pressure water injection steel tubes are connected with water inlet pipe connectors; a sealing rubber ring is arranged at a hole opening part of each water injection drilling hole, and the positions between the water injection drilling holes except for the water injection drilling holes in the positions nearby the breakage zone and the high-pressure water injection steel tubes are plugged through cement paste. The breakage and slippage type rockburst risk relieving high-pressure water injection device and the construction method are suitable for the field of deep-buried hard rock underground engineering.

Description

technical field [0001] The invention relates to a high-pressure water injection device and a construction method thereof for relieving the risk of fracture-slip rockburst, and is applicable to the field of deep-buried hard rock underground engineering. Background technique [0002] Rockburst is a sudden and severe form of destruction of surrounding rock in deep underground engineering, which is caused by the sudden release of potential energy or strain energy accumulated in the rock. Rockbursts in deep underground engineering often occur under some specific geological background conditions. In addition to the basic conditions of burial depth and rock mass integrity, rockburst damage is often related to geological structures and faults. According to the current international consensus, rockbursts can generally be divided into three types, namely, strain-type rockburst, fracture-type rockburst and rock-pillar-type rockburst, among which the most prominent impact on engineering...

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Problems solved by technology

[0004] According to the above-mentioned mechanism of rockburst, the control method for rockburst risk is mainly to reduce the degree of stress or energy concentration, such as stress relief blasting, stress relief holes, surface water spraying, etc. , the technical difficulty is relatively high, and the risk control is extremely difficult. There are very few examples of relief projects in the world that specifically address the risk of fracture-slip rockbursts, and relevant technologies are urgently needed as support.

However, the high-pressure water injection measures used in coal mine practice require that the coal seam has water absorption and can change the characteristics of the coal seam in a softening manner, but it has a different mechanism and operating conditions from the high-pressure water injection under hard rock conditions; There are very few engineering examples of stress relief for fractured rockbursts, and there are no engineering application examples using high-pressure water injection measures

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