The Excavation Disturbed Zone Caused By Using Electronic Detonator And Nonel Tube Detonator In Blasting Excavation

Drilling and blasting technology are used on rock tunnel construction commonly. The blasting will break the rock inside the tunnel contour. At the same time the blasting can also cause damage to the surrounding rock which is the excavation disturbed zone (EDZ). The background reference of this paper is the Renhe tunnel engineering Lanyu railway. This paper belongs to the ministry of railway’s significant subject. This paper studies the scope of the damage of the surrounding rock caused by nonel tube detonator blasting and electronic detonator blasting respectively. The main work and major achievements of this paper are as follows:1) The blasting data have been collected in field test. The blasting construction used the nonel tube detonator and electronic detonator respectively.2) The field test blasting vibration velocity has been transformed to the dynamic load in FLAC3D. The numerical calculations have been done.3) The scope of damage have been calculated which are caused by the blasting using the nonel tube detonator and electronic detonator respectively. The results show that using the electronic detonators the blasting damage to the surrounding rock can be reduce by35.33%.4) The affect due to the blasting excavation and redistribution of stresses has been discussed by numerical calculation.5) Consulting the Hongxian Fu and Yong Zhao’s research report (The ministry of Railways Research Report). The report gives the scope of EDZ by wave testing. The results show that this paper’s numerical calculation study offers a certain value in the actual application of the tunnel construction.