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권혁기 ( Kwon Hyek-kee ),신용석 ( Shin Yong-suk ) 한국구조물진단유지관리공학회 2011 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.15 No.1
Fill type dams’ section can be divided into rock zone and core zone. The rock zone accounts for 80% of dam body and its main role is to maintain the dam's strength, building with rocks which make the coring for the dynamic properties practically impossible. Also, the core zone which accounts for 10% of dam body and has very important role of water cutoff, has very limited applicability of in-situ shear wave test in the drilled hole and in-lab tests due to the impracticability of retrieving the core sample. In this thesis, rock zone's and core zone's shear velocities by depth were evaluated using surface shear wave technique which
권혁기 ( Kwon¸ Hyek Kee ),이종근 ( Lee¸ Jong Keun ),안상로 ( Ahn¸ Sang Ro ),신은우 ( Shin¸ Eun Woo ) 한국구조물진단유지관리공학회 2002 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.6 No.2
The purpose of this study is to suggest some references of maintenance and design of Gravity Concrete Dams by analyzing dynamic characteristics in x, y, z directions when earthquakes occur. We consider gravity concrete dams such as Chunchon, Paldang and Chungju dam in Han River basin as some cases.
권혁기(Kwon, Hyek-Kee),신용석(Shin, Yong-Suk) 한국구조물진단유지관리학회 2011 한국구조물진단학회 학술발표회논문집 Vol.15 No.1
Fill type dams’ section can be divided into rock zone and core zone. The rock zone accounts for 80% of dam body and its main role is to maintain the dam’s strength, building with rocks which make the coring for the dynamic properties practically impossible. Also, the core zone which accounts for 10% of dam body and has very important role of water cutoff, has very limited applicability of in-situ shear wave test in the drilled hole and in-lab tests due to the impracticability of retrieving the core sample. In this thesis, rock zone’s and core zone’s shear velocities by depth were evaluated using surface shear wave technique which doesn’t require the drilled hole, proposing shear wave equation associated with confining stresses.
허춘근 ( Hur Choon Kun ),권혁기 ( Kwon Hyek Kee ),김종호 ( Kim Jong Ho ) 한국구조물진단유지관리공학회 2004 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.8 No.2
The purpose of this study is to suggest some references of maintenance and stability of intake towers by analyzing dynamic characteristics in x,y, z directions when earthquakes occur. We consider general symmetrical and unsymmetrical intake towers of an irrigation dam for comparing a hydrodynamic pressure and eigenvalues. Hydrodynamic pressure gives more influence to the unsymmetrical intake tower of an irrigation dam on the normal water level and dead storage level better than the symmetrical intake tower of an irrigation dam. Also, the eigenvalues character of intake towers is showed a spectrum gravity on Standard Design Response Spectrum is located on the peak value by a frequency.
허춘근(Hur Choon Kun),권혁기(Kwon Hyek Kee),김종호(Kim Jong Ho) 한국구조물진단유지관리학회 2004 한국구조물진단학회 학술발표회논문집 Vol.- No.-
The purpose of this study IS to suggest some references of maintenance and stability of Intake towers by analyzing dynamic characteristics In x, y, z directions when earthquakes occur. We consider general symmetrical and unsymmetrical Intake towers of an Irrigation dam for comparing a hydrodynamic pressure and eigenvalues Hydrodynamic pressure gives more Influence to the unsymmetrical Intake tower of an irrigation dam on the normal water level and dead storage level better than the unsymmetrical Intake tower of an irrigation darn, Also. the eigenvalues character of Intake towers is showed a spectrum gravity on Standard Design Response Spectrum is located on the peak value by a frequency
필댐 제체 재료의 동적 물성치 평가 : Ⅰ. 현장 전단파 속도 주상도
김종태(Kim, Jong-Tae),김동수(Dongsoo Kim),박헌준(Park, Heon-Joon),권혁기(Kwon Hyek-Kee) 한국지반공학회 2009 한국지반공학회논문집 Vol.25 No.12
It is very important to measure reliable dynamic properties of each zone in dam for seismic design. However, the Vs values of core and rock-fill zone are seldom determined by field test. Consequently, seismic design in dam is performed using Vs values assumed or empirically determined. So, it is required that reliable Vs has to be evaluated by in-situ test. In this study, surface wave method, which is nondestructive, was applied to dam to evaluate Vs profiles of core and rock-fill zone in dam. In 6 dams, using SASW and HWAW methods, Vs profiles were evaluated reliably. D/B of Vs profiles of each zone with depth and relationship between confining pressure and Vs profiles of rock-fill zone were constructed including existing results of other dams. The evaluated D/B and proposed relationship were compared with the frequently used empirical method by Sawada and Takahashi.
필댐 제체 재료의 동적 물성치 평가 : Ⅱ. 비선형 동적 변형특성
이세현(Lee, Sei-Hyun),김동수(Dongsoo Kim),추연욱(Yunwook Choo),권혁기(Kwon Hyek-Kee) 한국지반공학회 2009 한국지반공학회논문집 Vol.25 No.12
Nonlinear dynamic deformation characteristics, expressed in terms of normalized shear modulus reduction curve (G/G<sub>max</sub>- logγ, G/G<sub>max</sub> curve) and damping curve (D-logγ), are important input parameters with shear wave velocity profile (Vs-profile) in the seismic analysis of (new or existing) fill dam. In this paper, the reasonable and economical methods to evaluate the nonlinear dynamic deformation characteristics for core zone and rockfill zone respectively are presented. For the core zone, 111 G/G<sub>max</sub> curves and 98 damping curves which meet the requirements of core material were compiled and representative curves and ranges were proposed for the three ranges of confining pressure (0~100 kPa, 100 kPa~200 kPa, more than 200 kPa). The reliability of the proposed curves for the core zone were verified by comparing with the resonant column test results of two kinds of core materials. For the rockfill zone, 135 G/G<sub>max</sub> curves and 65 damping curves were compiled from the test results of gravelly materials using large scale testing equipments. The representative curves and ranges for G/G<sub>max</sub> were proposed for the three ranges of confining pressure (0~50 kPa, 50 kPa~100 kPa, more than 100 kPa) and those for damping were proposed independently of confining pressure. The reliability of the proposed curves for the rockfill zone were verified by comparing with the large scale triaxial test results of rockfill materials in the B-dam which is being constructed.