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Field investigation of blast-induced damage of the sedimentary strata rock mass at PT Kaltim Prima Coal, Indonesia
Simangunsong G.M.a, Yulianto E.b, Kramadibrata S.c, Matsui K.a, Shimada H.a, Kubota S.c, Ogata Y.b
a Dept. of Earth Resources Eng., Kyushu University, Japan
b PT Kaltim Prima Coal, Indonesia
c Rock Blasting Eng. Lab., Dept. of Mining Eng., ITB, Indonesia
[vc_row][vc_column][vc_row_inner][vc_column_inner][vc_separator css=”.vc_custom_1624529070653{padding-top: 30px !important;padding-bottom: 30px !important;}”][/vc_column_inner][/vc_row_inner][vc_row_inner layout=”boxed”][vc_column_inner width=”3/4″ css=”.vc_custom_1624695412187{border-right-width: 1px !important;border-right-color: #dddddd !important;border-right-style: solid !important;border-radius: 1px !important;}”][vc_empty_space][megatron_heading title=”Abstract” size=”size-sm” text_align=”text-left”][vc_column_text]Five blasting operations at two different pits within PT Kaltim Prima Coal (KPC) were carefully investigated. The areas of interest were Harapan South Pit and Melawan Thiess Pit. The field investigation was carried out to measure the significance of the blast induces fractures within a rock mass. First of all, investigation holes were made and drilled relatively perpendicular with blasting row at near distance behind the last blasting row. To quantitatively determine rock mass fractures, a borehole camera was applied to investigate cracks before and after the blast. A vibration geophone was arranged close to the collar of each investigation hole to monitor peak particle velocity (PPV) of the ground surface. Plotting the PPV as a function of distance divided by cube root or square root of the explosive weight was employed to predict attenuation or decay the PPV. From the data obtained, it was found that the cracks increase proportionally with the PPV.[/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Author keywords” size=”size-sm” text_align=”text-left”][vc_column_text]Borehole camera,Crack density,Rock blasting,Rock damage,Vibration velocity[/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Indexed keywords” size=”size-sm” text_align=”text-left”][vc_column_text]Borehole Camera,Crack Density,Rock Blasting,Rock Damage,Vibration Velocity[/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Funding details” size=”size-sm” text_align=”text-left”][vc_column_text][/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”DOI” size=”size-sm” text_align=”text-left”][vc_column_text]https://doi.org/10.4028/www.scientific.net/msf.465-466.175[/vc_column_text][/vc_column_inner][vc_column_inner width=”1/4″][vc_column_text]Widget Plumx[/vc_column_text][/vc_column_inner][/vc_row_inner][/vc_column][/vc_row][vc_row][vc_column][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][/vc_column][/vc_row]