Hollow-hole rhombic parallel cut blasting damping method

Abstract

The invention relates to a hollow-hole rhombic parallel cut blasting damping method. Blasting tunneling is performed on the tunnel face of an underground tunnel. The construction method comprises using a down-the-hole drill to drill a hollow hole with the diameter of 90mm to 180mm at the position of the middle of the tunnel face of the tunnel; using a hammerdrill to drill a plurality of blast holes, enabling the blast holes to comprise cut holes, auxiliary holes, periphery holes and base plate holes which are expanded around the hollow hole; filling explosives and detonators, using stemming to seal the blast holes, adopting rock emulsion explosives, and using ordinary millisecond nonel detonators or high-precison millisecond nonel detonators; and detonating the explosives according to blast hole arranging orders and detonator delay time. The hollow-hole rhombic parallel cut blasting damping method has the advantages that when an urban subway underneath passes buildings at a close range in a granite stratum and old resident houses, the blast vibration speed can be effectively controlled, influences of blast vibration on the buildings and life of residents are reduced, and compared with a traditional wedge cut blasting scheme, the hollow-hole rhombic parallel cut blasting damping method enables the maximum blasting vibration speed to be reduced by 50%.

Description

technical field [0001] The invention belongs to the excavation and blasting technology of urban traffic tunnels, and in particular relates to a blasting shock absorption method for hollow hole straight eye rhombic cut, which is used for the construction of urban subway tunnels passing through granite strata and under buildings at a short distance. Background technique [0002] At present, in order to solve the increasingly serious problem of urban traffic congestion, underground railways in cities and suburbs, elevated railways on the ground and ground tracks have been connected into a transportation network, collectively referred to as subways. With its many advantages such as convenience, speed, and environmental protection, the subway has become the first choice for many countries to solve the problem of urban traffic congestion. [0003] In the case of geological conditions dominated by rocks, combined with various factors, the drilling and blasting method has become the...

AI Technical Summary

Problems solved by technology

Although the blasting construction method has the advantages of low cost and high tunneling efficiency, the explosion of explosives during the construction process will produce negative effects such as shock waves, blasting vibrations, and toxic gases. Therefore, safety problems during use have always hindered its promotion. Key bottleneck issues for development

Especially in the construction process of urban tunnel blasting and excavation, due to the blasting and excavation construction under various unfavorable conditions such as the depth of the tunnel and various buildings on the ground, the vibration effect generated by the blasting construction becomes the first in the construction process. Negative effects to be controlled that can have serious consequences if not well controlled

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