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압축피로에 의한 포천화강암의 미세균열 발달과 P파속도 이방성
김영화,장보안,문병관,Kim, Yeonghwa,Jang, Bo-An,Moon, Byeung Kwan 대한자원환경지질학회 1997 자원환경지질 Vol.30 No.4
P wave velocities of core samples from the Pocheon granite were measured before and after applications of cyclic loading. Then. distribution of the pre-existing microcracks and microcracks developed due to the cyclic loading was investigated by analyzing P wave velocity anisotropies and microscopic observations from thin sections. Anisotropy constants were calculated with three different ways: (1) $C_A$ between the maximum and the minimum velocities, (2) $C_AI$ between velocities measured along the axial direction and the average of six velocities measured in the planes perpendicular to the loading axis (rift plane) and (3) $C_AII$ between the maximum and the minimum velocities measured in the plane perpendicular to the loading axis. Among anisotropy constants. $C_AI$ was the most effective anisotropy constant to identify the rift plane whose orientation is parallel to the pre-existing microcracks as well as the distribution of stress induced microcracks. $C_AI$ decreased after cyclic loading and the relationship between $C_AI$ and number of cycles shows comparatively coherent negative trends. indicating that stress induced microcracks are aligned perpendicular to the orientation of pre-existing microcracks and that the amounts are proportional to the number of loading cycles. The difference of anisotropy constants before and after cyclic loading was effective in delineating the level of cracks and we called it Induced Crack Index. Velocity measurements and microscopic observations show that anisotropy was caused mainly due to microcracks aligned to a particular direction.
A Study on the Structure of the Yangsan Fault In the southern part of Kyeongju
김영화,이기화,Kim, Yeonghwa,Lee, Kiehwa The Korean Society of Economic and Environmental G 1987 자원환경지질 Vol.20 No.4
양산단층의 구조를 밝히는 연구의 일환으로 경주 남쪽지역을 대상으로하여 지질 및 저주파 전자탐사방법에 의한 단층탐사를 실시하였다. 그 결과 양산단층지역의 구조적 특성에서부터 파쇄대의 규모, 단층선의 위치 등에 대한 새로운 사실들이 밝혀졌으며, 단층파쇄대의 규모와 단층변의 위치에 있어서 지질 및 지전기학적 연구성과가 서로 일치됨이 확인 되었다. As a part of study on the structure of the Yangsan Fault, geological and VLF EM studies have been made in the fault area approximately between Kyeongju and Eonyang. The result provides comparatively clear information on the trace of the fault and extent of fracture zone as well as the structural characteristics of the Yangsan Fault area. The location of fault trace identified from this VLF EM study coincides well in general with that expected from geological information of the area. And the extent of fault fracture zone turn out to be characterized by U shaped low resistivity zone whose width increases from north to south.
김영화,홍순호,Kim, Yeonghwa,Hong, Soon Ho 대한자원환경지질학회 1990 자원환경지질 Vol.23 No.2
Upon the basis of the measurements of index properties and ultrasonic velocities as well as the determination of degree of weathering mainly based on microscopic observation, relatively fare correlation has been found between the degrees of weathering and the physical properties of rocks, particularly between degrees of weathering and maximun water content. A significantly better correlation has been obtained between degree of weathering and P wave velocity by grouping rock samples according to rock facies. This study presented the range of physical parameters corresponding to each degree of weathering in granites.
A Study on the Structure of the Yangsan Fault In the southern part of Kyeongju
Yeonghwa Kim(金永和),Kiehwa Lee(李基和) 대한자원환경지질학회 1987 자원환경지질 Vol.20 No.4
양산단층의 구조를 밝히는 연구의 일환으로 경주 남쪽지역을 대상으로하여 지질 및 저주파 전자탐사방법에 의한 단층탐사를 실시하였다. 그 결과 양산단층지역의 구조적 특성에서부터 파쇄대의 규모, 단층선의 위치 등에 대한 새로운 사실들이 밝혀졌으며, 단층파쇄대의 규모와 단층변의 위치에 있어서 지질 및 지전기학적 연구성과가 서로 일치됨이 확인 되었다. As a part of study on the structure of the Yangsan Fault, geological and VLF EM studies have been made in the fault area approximately between Kyeongju and Eonyang. The result provides comparatively clear information on the trace of the fault and extent of fracture zone as well as the structural characteristics of the Yangsan Fault area. The location of fault trace identified from this VLF EM study coincides well in general with that expected from geological information of the area. And the extent of fault fracture zone turn out to be characterized by U shaped low resistivity zone whose width increases from north to south.