PHYSICS OF ROCKS AND PROCESSES | |

ArticleName | Seismically safe parameters of confined blasting in levelling dry dock bottom |

DOI | 10.17580/em.2022.02.04 |

ArticleAuthor | Tyupin V. N., Yanitsky E. B., Polyakh A. E., Ignatenko I. M. |

ArticleAuthorData | Belgorod State National Research University, Belgorod, Russia:
JSC VIOGEM, Belgorod, Russia:
LLC Special Operations, Murmansk, Russia: |

Abstract | During construction of a dry dock, it became necessary to level the bottom of gneissic granite rock mass to 7 m by blasting. The blasting site appeared to be spaced at 8.5–20.0 m from a reinforced concrete caisson and a sand cofferdam reinforced with soil–cement piles. Aiming to ensure the required levelling at 16.2 m, the preset fragmentation quality and the reduced seismic safety, the parameters associate with the drilling-and-blasting pattern were calculated. The values of PPV caused by blasting-induced seismic waves in the caisson and cofferdam were found from the constructed formulas. The experimental measurement of ground vibrations induced by blasting used seismic recorder Vibracord DX. Al in all, 20 large-scale blasts were performed, and the blasted rock volume totaled 9 Km |

keywords | Blasting, confined conditions, blasting-induced seismic effect, caisson, cofferdam, soil– cement piles, physicotechnical properties, calculation formulas, PPV, seismograms, reliability |

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Full content | Seismically safe parameters of confined blasting in levelling dry dock bottom |