Zobrazeno 1 - 10
of 35
pro vyhledávání: '"Han Kyu Yoo"'
Publikováno v:
Buildings, Vol 14, Iss 9, p 2772 (2024)
This study introduces a simplified method for predicting the optimal cutting conditions to maximize excavation efficiency based on tool forces. A laboratory-scale linear rock-cutting test was conducted using a conical pick on Finike limestone. The to
Externí odkaz:
https://doaj.org/article/8e9f51fd613b43c5a333d5e90ab59fff
Autor:
Hafeezur Rehman, Abdul Muntaqim Naji, Wahid Ali, Muhammad Junaid, Rini Asnida Abdullah, Han-kyu Yoo
Publikováno v:
International Journal of Mining Science and Technology, Vol 30, Iss 3, Pp 381-386 (2020)
The main aspects that require attention in tunnel design in terms of safety and economy are the precise estimation of probable ground conditions and ground behavior during construction. The variation in rock mass behavior due to tunnel excavation seq
Externí odkaz:
https://doaj.org/article/d4dbb6129fc6478b97da949c66e01220
Publikováno v:
Applied Sciences, Vol 13, Iss 2, p 1205 (2023)
Mechanical methods of tunnel excavation are widely used because of their high excavation output, and the selection of appropriate technology depends on ground composition and project-related features. Compared with tunnel boring machines (TBMs) and r
Externí odkaz:
https://doaj.org/article/3313e0189b0a45b0ab624c55e5e49736
Publikováno v:
Applied Sciences, Vol 12, Iss 17, p 8793 (2022)
Rock fragments obtained by excavation can provide information for evaluating the excavation efficiency, for which the coarseness index (CI) and particle size parameters (d50, dMPS, and d′) are used. However, CI depends on the number and size of the
Externí odkaz:
https://doaj.org/article/0b180380abe14ba7bc834670d01fe367
Publikováno v:
Applied Sciences, Vol 12, Iss 9, p 4489 (2022)
Owing to several advantages, mechanical pre-cutting techniques were first introduced in the United States and subsequently used in Europe for tunneling. Pre-cutting machines perform mechanical excavation tunneling using cutting tools such as tunnel b
Externí odkaz:
https://doaj.org/article/8d8e2355568a42829c2e52ff4e3adbb2
Autor:
Sang-gui Ha, Abdul Muntaqim Naji, Hafeezur Rehaman, Kyoung-min Nam, Han-eol Kim, Jae-won Park, Han-kyu Yoo
Publikováno v:
Applied Sciences, Vol 11, Iss 12, p 5405 (2021)
In the convergence–confinement method, the longitudinal deformation profile (LDP) serves as a graphical representation of the actual tunnel convergence (both ahead of and behind the face); therefore, it is considered important for determining the d
Externí odkaz:
https://doaj.org/article/c8a4b3cffa264e7a947310e3720a60e8
Publikováno v:
Applied Sciences, Vol 11, Iss 4, p 1655 (2021)
During underground construction, the behavior of the ground is influenced by characteristics of the rock mass with situ stresses and ground water, cross section of the excavation area, excavation method, and the rate of excavation. These fundamental
Externí odkaz:
https://doaj.org/article/1af2e5d247804e2aaed810cd891e6ebe
Publikováno v:
Applied Sciences, Vol 8, Iss 12, p 2659 (2018)
Empirical systems for the classification of rock mass are used primarily for preliminary support design in tunneling. When applying the existing acceptable international systems for tunnel preliminary supports in high-stress environments, the tunneli
Externí odkaz:
https://doaj.org/article/57986849f7e444c4b459c5277e2e417b
Autor:
Hafeezur Rehman, Wahid Ali, Abdul Muntaqim Naji, Jung-joo Kim, Rini Asnida Abdullah, Han-kyu Yoo
Publikováno v:
Applied Sciences, Vol 8, Iss 8, p 1250 (2018)
Although rock-mass rating (RMR) and tunneling quality index (Q) systems are used in different rock engineering projects as empirical design tools, their application in tunnel design is widely accepted as these systems were developed and updated for t
Externí odkaz:
https://doaj.org/article/88168869b1314a78acd6cd4fa82bd5e4
Autor:
Ho Won Lee, In Yeob Na, Gyu Tae Kim, Sungkyu Lee, Young Kwan Kim, Han Kyu Yoo, Kyo Min Hwang, Hyun Jung Baek
Publikováno v:
Nanoscience and Nanotechnology Letters. 9:14-19
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a0069fb94ccf59feb7376624ce3453ae
https://doi.org/10.1166/nnl.2017.2304
https://doi.org/10.1166/nnl.2017.2304