E3S Web Conf.
Volume 129, 20191st International Scientific Conference “Problems in Geomechanics of Highly Compressed Rock and Rock Massifs” (GHCRRM 2019)
|Number of page(s)||4|
|Published online||08 November 2019|
Restrictions on seismic impact of blast in the open-pit border zone at the open-pit and combined mining
Institute of mining Ural Branch of RAS, 620075 Ekaterinburg, Russia.
* Corresponding author: email@example.com
The combined mining under the condition of underground mining in the aquifer rock mass of the open-pit sides raises an acute issue of joint drill-and-blast works (D&B). The construction of an underground mine begins normally with the approach of the open-pit mine depth to the final marks. In this situation, if there is a volume for the cutback, it is very small, and the blast works come close to the limit open-pit contour, behind which the protected rock mass is located and in the future the underground mining is supposed to be carried out. The main task in the drill-and-blast works under such conditions is to preserve the stability of this rock mass. The well-timed shielding of the blast and creating the fracture surfaces by the trim blasting reduce the negative impact of the blast on the open-pit side, but do not always prevent the propagation of stress waves caused by the seismic effect along the rock mass. Therefore, restriction of the seismic effect of blast in the border zone is as important for the stability of the rock mass as professional deviated contour holes.
Key words: explosion / blast works / seismic effect of blast / open and combined mining / permissible displacement rate of rock mass / dynamic strength / seismic stability of mines / integrity of mines
© The Authors, published by EDP Sciences, 2019
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