Deep-buried tunnel instant rock burst active control method

Abstract

The invention provides a deep-buried tunnel instant rock burst active control method and belongs to the technical field of geotechnical engineering. The method comprises the steps of determining the amplitude and orientation of the maximum main stress and the minimum main stress of a tunnel face at first; then drilling deep cannon holes and cut slots in the center area in front of the tunnel facein the direction parallel to the excavation axis of a tunnel, and detonating the deep cannon holes in the center area; sealing non-center deep cannon holes and the orifice sections of the cut slots through accelerated cement, arranging conventional cannon holes in the tunnel face along the outline of the tunnel after high-pressure water injection, and detonating the conventional cannon holes; andimplementing the above drilling and blasting scheme circularly along with continuous forward propelling of the tunnel face, specifically, in the subsequent circulating process, the explosive load of the conventional cannon holes can be reduced according to an actual blasting effect. The deep-buried tunnel instant rock burst active control method can be widely applied to the industries of hydropower, mining, traffic and the like under the condition of high ground stress.

Description

technical field [0001] The invention relates to the technical field of geotechnical engineering, in particular to a method for active prevention and control of instant rock bursts in deep-buried tunnels. Background technique [0002] During the excavation of deep underground engineering, rockbursts are usually caused by rapid release of strain energy through brittle fractures in areas with high in-situ stress of hard and brittle rock masses. Rockburst is an engineering geological problem often encountered during the excavation of hard rock underground engineering under the condition of deep burial and high in-situ stress. Because of its sudden nature and accompanied by the sudden release of strain energy in the rock mass, it often manifests as burst ejection in the form of , which greatly threatens the safety of construction personnel and equipment on site. [0003] At present, the main rockburst prevention and control measures include: (1) For deep mining of metal mines, t...

AI Technical Summary

Problems solved by technology

Although these methods reduce the strain energy released by the rock mass during a single blasting and have a certain effect on the prevention and control of rock bursts, these methods ignore the in-situ stress of the rock mass and the dynamic impact of the transient release of strain energy, sacrificing the excavation efficiency. For the price, the problem of instant rockburst in deep tunnels has not been fundamentally solved

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