EXPERIMENTAL STUDY ON THE STABILITY OF SURROUNDING ROCK IN TUNNEL BLASTING CONSTRUCTION
DOI:
https://doi.org/10.14311/CEJ.2018.01.0007Keywords:
Tunnel E ngineering Blasting A ttenuation L aw of B last V ibration S tabilityAbstract
In this study,
criteria and blast ing technologies are introduced in order to control the stability of
surrounding rock of tunnel built using drill and blast safety . The paper is composed of three parts,
namely, a blast vibration propagation law in roof surrounding rock in close proximity to tunnel face,
two formulae to calculate particle critical vibration velocity of shotcrete and key structural element at
the roof of tunnel, and innovative technologies of tunnel blasting . The blast vibration propagation
law is the base to control the sta bility of surrounding rock during tunnel blast ing Based on
Morhr Coulomb criterion and the dynamic analys is, two formulae to calculate the critical particle
vibration velocity are proposed Based on a series of trial blasts using electronic detonators, tw o
innovative blasting technologies are derived. One is the blast holes detonated one by one by using
electronic detonator , and another is the blast holes detonated by combining initiation system of
electronic detonators and nonel detonators T he use of ele ctronic detonators in tunnel blasting not
only leads to a smaller blast vibration but also to a smaller extent of the EDZ (excavation damaged
zone)
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