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Determining Parameters of Dynamic Fracture Process Analysis(DFPA) Code to Simulate Radial Tensile Cracks in Limestone Blast  

Kim, Hyon-Soo (전북대학교 자원.에너지공학과)
Kang, Hyeong-Min (전북대학교 자원.에너지공학과)
Jung, Sang-Sun (전북대학교 자원.에너지공학과)
Kim, Seung-Kon (전북대학교 자원.에너지공학과)
Cho, Sang-Ho (전북대학교 자원.에너지공학과)
Publication Information
Explosives and Blasting / v.31, no.2, 2013 , pp. 6-13 More about this Journal
Abstract
Recently, complaints or environmental problems caused by the noise and dust generated from crusher of the mine and quarry are emerging. Therefore mining facilities such as crushers and mills have been installed in an underground. In order to facilitate crusher equipments in the underground, excavation of large space is required and then the stability of the large space underground structure is an important issue. In this study, the blast experiments, which use a block of the limestone, are performed. Based on the blast experiments, the numerical model was prepared and simulated using dynamic fracture process analysis code(DFPA) with considering the rising time of applied borehole pressure and microscopic tensile strength variation. Comparing the non-dimensional crack length and no-dimensional tensile strength obtained from blast experiments and numerical analyses, the input parameters of DFPA code for predicting a radial tensile crack in limestone blasting were determined.
Keywords
Excavation damaged zone; Dynamic fracture process analysis (DFPA) code; Microscopic tension strength;
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