Hard rock tunnel non-blasting digging blocking method and construction method

Abstract

The invention relates to a hard rock tunnel non-blasting digging blocking method and a construction method. According to the method, a hole drilling core taking technology is utilized, mutually engaged cutting peripheral holes are formed along a tunnel digging contour line, so that a hole wall-shaped digging free face is formed on the periphery of a tunnel face; a hydraulic splitting machine splitting technology is used, in addition, the characteristic that the tensile intensity and the shearing-resistant intensity of rock are much smaller than the pressure-resistant intensity is utilized, the tunnel face digging blocking is firstly carried out, in each digging block, the synchronous splitting digging splitting surfaces do not exceed two, in addition, the two splitting surfaces are in large-angle obtuse angle intersection, in addition, at least one digging free face vertical to the tunnel face is included, then, the digging construction sequence from the lower side to the upper side and from the periphery to the middle is adopted, and the smaller splitting force is used for carrying out rock pulling cracking and shearing cutting splitting digging on the tunnel face along the splitting surface. The hard rock tunnel non-blasting digging blocking method has the advantages that the adverse influence of vibration, noise and dust in the hard rock digging construction can be eliminated, and the utilization rate of tunnel hole slag as building stone materials can be improved.

Description

technical field [0001] The invention relates to the field of tunnel engineering, in particular to a block method and construction method for non-blasting excavation of hard rock tunnels. Background technique [0002] Hard rock tunnels are generally constructed using the drill and blast method. Drilling and blasting construction will cause blasting vibration in the surrounding rock of the tunnel and adjacent building structures, which will have an adverse effect on the mechanical properties of the surrounding rock of the tunnel and the adjacent building structures. At the same time, blasting construction will also emit blasting noise, which will damage the living environment around the tunnel. Even if controlled blasting technology is adopted in blasting construction, it is still difficult to eliminate the adverse effects of blasting vibration and noise. Therefore, for tunnel projects with strict requirements on blasting vibration and blasting noise, the drilling and blasti...

AI Technical Summary

Problems solved by technology

Drilling and blasting construction will cause blasting vibration in the surrounding rock of the tunnel and adjacent building structures, which will have an adverse effect on the mechanical properties of the surrounding rock of the tunnel and the adjacent building structures

At the same time, blasting construction will also emit blasting noise, which will damage the living environment around the tunnel

Even if controlled blasting technology is adopted in blasting construction, it is still difficult to eliminate the adverse effects of blasting vibration and noise

Therefore, for tunnel projects with strict blasting vibration and blasting noise requirements, the drilling and blasting method is difficult to meet the engineering requirements, and non-blasting excavation construction technology is required

[0003] In the existing non-blasting excavation construction technology, the milling method and the tunnel boring machine method can overcome the shortcomings of the drilling and blasting method, but the milling method is generally suitable for construction in soft rock, and in hard rock, it has a lot of wear and tear. Low work efficiency; the tunnel boring machine method is generally applicable to tunnel projects with hard surrounding rock, long tunnel length and constant tunnel section, and is not suitable for tunnel projects with short length and variable section

Manual pneumatic pick excavation method and hydraulic impact hammer excavation method are often suitable for tunnel construction in soft surrounding rock. For hard surrounding rock, the construction efficiency is low, and hydraulic impact hammer construction will also produce certain impact vibration

The expansion agent method has the problem of environmental pollution and will cause personal injury to the construction personnel, so protective covers must be worn during construction

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