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Takamura, Hiroaki*; Hamada, Hajime*; Sato, Toshinori
Dai-48-Kai Gamban Rikigaku Ni Kansuru Shimpojiumu Koenshu (Internet), p.13 - 18, 2022/01
In the stage blasting of a mountain tunnel, the condition of single hole initiation in which the effect of other stage does not enter was made by increasing the interval of initiation time between front and rear stages using an electron detonator, and the waveform of vibration and sound pressure at that time was measured. The knowledge obtained from the analysis of sound pressure waveform of single hole blasting is considered to be effective to be utilized for the examination of sound pressure reduction effect of controlled blasting and the analysis of error of noise prediction formula.
Kawakubo, Shohei*; Ono, Hirokazu; Matsui, Hiroya; Kato, Takeshi*
no journal, ,
no abstracts in English
Nishiwaki, Takafumi*; Ogawa, Koji*; Aoki, Kazuhiro; Yoshida, Takumi
no journal, ,
Various physical and mechanical tests were performed on shallow borehole cores (
30 m) taken from the activated Shionohira and the non-activated Kuruma faults associated with the April 2011 Fukushima-ken Hamadori earthquake. The results showed (1) low strength constants and elastic constants for the fault damage zone samples compared to the host rocks; (2) different physical properties for fault gouge, fault breccia, and Cataclasite of the fault damage zone; and (3) for fault gouge, the importance of considering the stress factor on the fault plane. Data accumulation from various fault damage zones is needed to gain better understanding of the physical properties of the fault damage zone.