Numerical simulation of stress wave interaction in short-delay blasting with a single free surface.

ABSTRACT: It is generally believed that stress wave superposition does occur and plays an important role in cutting blasting with a single free surface, in which explosive columns of several blast holes with short spacing are simultaneously initiated. However, considering the large scatter of pyrotechnic delay detonators that are used in most underground metal mines in China, the existence of stress wave superposition and the influence of this effect on rock fragmentation are questionable. In the present study, the stress wave interaction in short-delay blasting with a single free surface was studied through the use of the LS-DYNA code. Stress waves induced by two blast holes blasting with different delays were compared with the single blast hole case, and the effects of delay time, detonating locat

SUBMITTER: Qiu X 

PROVIDER: S-EPMC6157881 | biostudies-literature | 2018

REPOSITORIES: biostudies-literature