Authors: Fei Liu; Yuesong Tang
Addresses: Guangdong Provincial Key Laboratory of Deep Earth Sciences and Geothermal Energy Exploitation and Utilization, College of Civil and Transportation Engineering, Institute of Deep Earth Sciences and Green Energy, Shenzhen University, Shenzhen 518060, China ' College of Energy and Mining, China University of Mining and Technology, Beijing 100083, China
Abstract: By setting different stemming in the coal and rock at the bottom of the borehole, the effects on the propagation of blasting stress waves were studied. The ANSYS-LS/DYNA with damage model was used to simulate the propagation of blasting cracks in the coal and rock. The results show that the speed of propagation is significantly accelerated when the stress wave entering the interior of the rock. Different stemming has few effects on the crushing of coal. When water is used as filler, the obstruction on the stress wave is slightly greater than that of the coal itself. When the soil is used as filler, it has the greatest hindrance to stress waves and the smallest fragmentation of rock mass.
Keywords: stress wave; coal and rock; tensile damage; numerical calculation analysis.
International Journal of Mining and Mineral Engineering, 2020 Vol.11 No.3, pp.169 - 179
Received: 04 Oct 2019
Accepted: 18 Feb 2020
Published online: 07 Sep 2020 *