Deep-buried tunnel blasting excavation effect control method

Abstract

The invention discloses a deep-buried tunnel blasting excavation effect control method. The method comprises the steps that 1, the main stress level and direction of the heading face of a tunnel to be excavated are determined before blasting excavation; 2, according to the drilling and blasting design scheme with single fire dynamite as a core control index, blast holes are formed and explosive payload is designed on the heading face of the tunnel to be excavated; 3, a circle of conical cutting holes pointing to a center hollow hole of an original cutting hole section is added into the formed original cutting hole section, and breaking holes in the outmost circle are used as buffer holes; 4, on the basis of the excavation blasting design scheme, blasting internetworking is carried out on the blast holes except for the conical cutting holes; 5, blasting is carried out by the adoption of a micro-differential blasting method. The deep-buried tunnel blasting excavation effect control method can control excavation disturbance evoked by deep rock strain energy transient release and blasting loads at the same time so as to achieve active control over the deep rock damage and rock blast, and can be widely applied for control over blasting excavation and deep blasting mining disturbance of deep-buried underground engineering in the hydraulic and hydroelectric engineering field, the traffic field, the mine field and the like.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering, and in particular relates to a method for controlling the blasting excavation effect of a deep buried tunnel. Background technique [0002] Blasting and excavation disturbance has a great influence on the formation and evolution of deep-buried rock mass damage areas. Blasting and excavation effects such as vibration and damage of surrounding rocks are also geological problems often encountered in underground engineering blasting. It is a rock catastrophe phenomenon induced by human activities. . The application of self-blasting technology in large-scale projects, especially in the excavation of deep-buried rock mass in alpine and canyon areas, can greatly improve the construction progress and greatly reduce the construction cost. However, engineering disasters caused by blasting and excavation effects also occur. The excavation effect of blasting mainly refers to the phenomenon...

AI Technical Summary

Problems solved by technology

The traditional control method of blasting excavation disturbance does not consider the clamping effect of high ground stress when the deep rock mass cutting section is detonated, and the instantaneous strain energy of the cutting is released violently, and its shock wave may cause shock waves outside the excavation area when propagating to the deep part of the rock mass. The retained rock mass caused damage, and the traditional pre-splitting blasting construction technology generally does not use pre-splitting blasting technology under high ground stress, and its network needs to be further optimized

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