Zobrazeno 1 - 10
of 64
pro vyhledávání: '"Kimihiro HASHIBA"'
Autor:
Kimihiro HASHIBA, Katsunori FUKUI
Publikováno v:
Journal of MMIJ, Vol 140, Iss 6, Pp 42-49 (2024)
Percussion rock drills have been widely used mainly for blast hole drilling in mineral extraction, tunnel excavation, and underground development. To advance the performance and efficiency of rock drills, it is essential to understand the complex mec
Externí odkaz:
https://doaj.org/article/71f0c729b14247038d1d48a35695e4ff
Publikováno v:
Journal of Rock Mechanics and Geotechnical Engineering, Vol 14, Iss 2, Pp 653-662 (2022)
For estimating the long-term stability of underground framework, it is vital to learn the mechanical and rheological characteristics of rock in multiple water saturation conditions. However, the majority of previous studies explored the rheological p
Externí odkaz:
https://doaj.org/article/d1c1c8745da84c979418aa83cb1f0fa2
Autor:
Kimihiro HASHIBA, Katsunori FUKUI
Publikováno v:
Journal of MMIJ, Vol 136, Iss 1, Pp 1-7 (2020)
Time dependence, probability distribution, and size effect have been investigated by many researchers and are still important issues in rock engineering. These seem to be different characteristics of rock but were found to be closely related to each
Externí odkaz:
https://doaj.org/article/b9f24ab639bd44d58b901b6cd115fce1
Dependence of Uniaxial Compressive Strength of Sanjome Andesite on Loading Rate and Water Saturation
Publikováno v:
Journal of MMIJ, Vol 134, Iss 3, Pp 41-45 (2018)
It is known that the rock strength increases with an increase in loading rate. Many studies on the loadingrate dependence of rock strength have been performed under two environments, namely water-saturated and airdried conditions, and the loading-rat
Externí odkaz:
https://doaj.org/article/c29845ab73894dc582e5ea8adc5479f2
Publikováno v:
Journal of MMIJ, Vol 134, Iss 2, Pp 22-30 (2018)
Because blasting is a quite efficient and economical excavation method, it has been widely applied to tunnel excavation especially in hard rock. However, this method is rarely used to the tunnel site close to residential houses due to its environment
Externí odkaz:
https://doaj.org/article/006dd550835e46968c902fd55380443c
Publikováno v:
Journal of MMIJ, Vol 133, Iss 9, Pp 223-229 (2017)
Rock drills were developed about two hundred years ago, and hydraulic percussion rock drills are about half-century old. Performance and efficiency of rock drills have been increased by a number of researchers and engineers. Percussion energy was dra
Externí odkaz:
https://doaj.org/article/c3eea217b07b45f297db4fd2ce50d11d
Publikováno v:
Journal of MMIJ, Vol 133, Iss 6, Pp 107-115 (2017)
The effect of water on the mechanical properties of rocks, such as strength and Young's modulus, has been investigated in many studies. To understand the mechanism of the effect of water on the mechanical behavior of rocks, not only these mechanical
Externí odkaz:
https://doaj.org/article/8a269e818c3e478dac6db3f488b7c46d
Publikováno v:
Journal of MMIJ, Vol 133, Iss 6, Pp 123-131 (2017)
Although blasting is a quite efficient and economical excavation method, it is rarely applied to tunnel projects close to residential areas due to its environmental impacts, especially with regard to vibration and noise. Two key controls used to miti
Externí odkaz:
https://doaj.org/article/8663352900ae4cbbb22b435c7e7773a5
Publikováno v:
Journal of MMIJ, Vol 132, Iss 8, Pp 129-136 (2016)
Computer simulation of percussive rock drilling requires appropriate numerical models for the interactions among the drill body, rod, rod joint, bit, and rock. In this study, the impact penetration of a bit into rock was investigated for the modeling
Externí odkaz:
https://doaj.org/article/7c2896628f4e4c2995937accf11700c7
Publikováno v:
Journal of MMIJ, Vol 132, Iss 8, Pp 144-151 (2016)
In the CERCHAR abrasivity test for rocks, to understand the wear process of styli is important for the appropriate setting of test conditions and for the estimation of bit wear in in-situ rock excavation. In this study, the wear process of a stylus w
Externí odkaz:
https://doaj.org/article/20afb77cf4654fb99a8e8f6a9f451f09