Tunnel Excavation Method Combined with Mechanical and Controlled Blasting

Abstract

The invention discloses a mechanical mode and control blasting combined tunneling method which includes utilizing a tunneling machine to excavate a set mechanical cutting zone on a tunnel face, conducting tunneling for first set length along the vertical direction of a tunnel, stopping tunneling, retreating the tunneling machine, drilling a plurality of upper explosive filling holes with second set length in a first control blasting region set above the mechanical cutting region on the tunnel face in the vertical direction of the tunnel, filling explosive in the plurality of upper explosive filling holes, conducting control blasting, clearing rock slag in the tunnel after the first control blasting region is subjected to the control blasting, repeating the steps twice or more than twice to obtain a section of upper middle space in the tunnel, drilling a plurality of lower explosive filling holes with third set length in a second control blasting region set under the mechanical cutting zone on the tunnel face in the vertical direction of the tunnel, filling the explosive in the plurality of lower explosive filling holes, conducting control blasting, clearing rock slag in the tunnel after the second control blasting region is subjected to the control blasting and repeating the construction till the whole tunnel is obtained.

Description

technical field [0001] The invention relates to a tunnel construction method, in particular to a construction method for excavating a tunnel by combining mechanical equipment and controlled blasting technology. Background technique [0002] In the field of tunnel construction, blasting excavation is mostly used in hard rock tunnel construction. If it is in a complex environment, especially when passing through a city, there are often many buildings (structures) on the upper part of the tunnel that need to be protected, and the blasting vibration generated by the tunnel construction will have a great impact on the surrounding environment. Vibration-absorbing excavation technology must be used to ensure safe and rapid tunneling. [0003] At present, the construction methods of urban shallow railway tunnels mainly include the following: full-face tunnel boring machine method (TBM), hydraulic impact hammer method, splitting method, static blasting method, etc. [0004] The ful...

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Problems solved by technology

The method of this invention has following shortcoming and deficiency: (1), it needs to use expensive tunnel boring machine (TBM) to excavate guide tunnel, makes construction cost very high; The upper wall of the guide tunnel is inclined upward to drill the inclined upper charge hole and charge the charge. This kind of construction in the guide tunnel with limited space has certain difficulties and potential safety hazards; (3), due to the use of tunnel boring machines (TBM), The flexibility of the tunnel construction process is reduced, and the entire construction process must be designed around the guide tunnel excavated by the tunnel boring machine (TBM)

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