光面掏槽爆破技术的研究及其在巷道掘进中的应用

doi:10.11872/j.issn.1005-2518.2018.03.349

Abstract

Abstract: Choosing a reasonable cutting form can improve the utilization ratio of blasting holes in the process of tunnel excavation and speed up the roadway driving speed. In view of the traditional parallel cutting，there is a big clamp system and low utilization ratio of blasting holes，therefore，the smooth-cutting blasting technology have been proposed in this paper. By using the three-dimensional nonlinear dynamic finite element software LS-DYNA，the elasticity calculation model was established to analyze the generation and transmission of stress under explosive charge，the numerical simulation clearly shows the process of rock fragmentation and expansion of the cavity，the numerical results show that the smooth-rectangular cutting blasting effect is good and can effectively improve the utilization rate of blasting holes. It is applied to the tunnel excavation engineering in a mining area，and has achieved satisfactory blasting effect，which have important guiding significance to the similar tunnel blasting excavation construction.

Key words: blasting, tunnel excavation, smooth-cutting, cavity forming process, numerical simulation, failure criterion, effective stress, LS-DYNA

CLC Number:

TD853

HU Guiying, LIU Kewei, DU Xin, LI Xiaohan. Research on Smooth-cutting Method and Its Application in Tunnel Excavation[J].Gold Science and Technology, 2018, 26(3): 349-356.

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Research on Smooth-cutting Method and Its Application in Tunnel Excavation