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손정술 ( Jeong-sul Son ),신승욱 ( Seungwook Shin ),박삼규 ( Sam-gyu Park ) 한국지구물리·물리탐사학회 2021 지구물리와 물리탐사 Vol.24 No.4
The complex resistivity method is an exploration technique that can obtain various characteristic information of underground media by measuring resistivity and phase in the frequency domain, and its utilization has recently increased. In this paper, a three-dimensional inversion algorithm for the CR data was developed to increase the utilization of this method. The Poisson equation, which can be applied when the electromagnetic coupling effect is ignored, was applied to the modeling, and the inversion algorithm was developed by modifying the existing algorithm by adopting comlex variables. In order to increase the stability of the inversion, a technique was introduced to automatically adjust the Lagrangian multiplier according to the ratio of the error vector and the model update vector. Furthermore, to compensate for the loss of data due to noisy phase data, a two-step inversion method that conducts inversion iterations using only resistivity data in the beginning and both of resistivity and phase data in the second half was developed. As a result of the experiment for the synthetic data, stable inversion results were obtained, and the validity to real data was also confirmed by applying the developed 3D inversion algorithm to the analysis of field data acquired near a hydrothermal mine.
이재욱,조성준,손정술,김창렬,박삼규,김정호,Lee, Jae-Wook,Cho, Seong-Jun,Son, Jeong-Sul,Kim, Chang-Ryol,Park, Sam-Gyu,Kim, Jung-Ho 대한자원환경지질학회 2008 자원환경지질 Vol.41 No.5
물리탐사는 측정점에 대한 정보에만 국한하는 다른 조사방법과는 달리 지반내부에 대한 영상 및 정보를 제공할 수 있으므로 환경오염부지 평가 및 감시, 지반조사, 지질재해 등에서 중요한 기술로 활용되고 있다. 본 연구에서는 상기물리탐사 요소기술에 관한 특허분석을 실시하였다. 1976년부터 2005년까지 출원된 특허의 요약문, 청구항, 도면 검색 등을 통해 총 904건의 관련 특허를 추출하였다. 추출된 특허를 대상으로 국가별, 연도별, 출원인별, 그리고 기술 분야별 출원동향을 분석하였다. 또한 미국특허 분석을 통해 국가별 기술수준을 비교 분석하였다. 상위 5위의 출원국가는 미국, 영국, 일본, 노르웨이 그리고 프랑스 순이었으며, 특히 미국과 영국 출원인의 특허건수가 663건(73.3%)으로 이 분야 기술개발을 주도하고 있는 것으로 파악되었다. Geophysical prospecting technologies are employed to environmental site assessments and monitoring, subsurface investigation, geologic hazard monitoring since they are able to provide information and imaging regarding the subsurface. In this study, we carried out several analysis on patent documents for the geophysical prospecting technologies. The patents including abstracts, claims and drawings from 1976 up to 2005 were surveyed and 904 patents were collected finally. The patents were investigated as to countries, years, assignees and technologies. Furthermore, we carried out the comparative analysis for technological level of assignee countries with United States patents. The top 5 assignee countries are United States, United Kingdom, Japan, Norway and France. Especially United States and United Kingdom play important role in this area as holding 663 patents.
박삼규,김창렬,손정술,김정호,이명종,조성준,Park, Sam-Gyu,Kim, Chang-Ryol,Son, Jeong-Sul,Kim, Jung-Ho,Yi, Myeong-Jong,Cho, Seong-Jun 대한자원환경지질학회 2006 자원환경지질 Vol.39 No.5
본 연구는 석회규산염암 공동에 의한 지반침하 지역에 3차원 전기비저항탐사를 실시하여 그 결과로부터 지하공동의 영상화를 시도했다. 조사지역은 무안군 용월리에 위치하고 있으며, 충적층 하부에 석회규산염암이 분포하고 있는 곳이다. 이 지역의 지질특성은 충적층 하부 석회규산염암의 용식작용에 의한 돌리네와 파쇄대를 따라 공동이 발달되어 있으며 과거 여러 차례 돌리네의 함몰에 의한 지반침하가 발생하였다. 조사지에 실시한 2차원 전기비저항탐사 결과로부터 지하공동이 분포하고 있는 곳은 주변의 기반암에 비하여 전기비저항이 낮게 나타나고 있는데 그 이유는 대부분의 석회규산염암 공동에 지하수와 점토로 충전되어 있기 때문임을 알았다. 2차원 전기비저항탐사 결과로부터 저비저항 분포 영역을 중심으로 3차원 전기비저항탐사를 실시하고, 전기비저항이 50ohm-m 이하를 지하공동으로 가정하여 3차원 전기비저항탐사 결과로부터 석회규산염암 공동을 영상화 하였다. 이것을 시추조사에서 공동이 발견된 위치와 비교한 결과 양자가 일치하고 있음을 알 수 있었으며, 석회규산염암에 발달되어 있는 지하공동 탐지에 3차원 전기비저항탐사가 유용함을 알 수 있었다. In this study, we examined the applicability of 3-D electrical resistivity survey to detect underground cavities within ground subsidence area at the field test site, located at Yongweol-ri, Muan-gun in Korea. Underground cavities are widely present within the limesilicate bedrock overlain by the alluvial deposits in the area of the test site where the ground subsidences have occurred in the past. The limesilicate cavities are mostly filled with groundwater and clays in the test site. Thus, cavities have low electrical resistivity compared to the surrounding host bedrock. The results of the study have shown that the zones of low resistivity correspond to the zones of the cavities identified in the boreholes at the test site, and that the 3-D electrical resistivity survey is very effective to detect underground cavities.
전기비저항 및 탄성파속도를 이용한 터널암반의 정량적 평가수법과 적용성
박삼규,김정호,조성준,이명종,손정술,Park, Sam-Gyu,Kim, Jung-Ho,Cho, Seong-Jun,Yi, Myeong-Jong,Son, Jeong-Sul 한국터널지하공간학회 2003 터널기술 Vol.5 No.3
Electrical resistivity prospecting has been recently increased in the application to tunnel, landslide and other investigations in the civil engineering field. Therefore, it is essential to establish the rock mass classification technique using electrical resistivity data. In this paper, the authors, try to propose a technique which can classify tunnel rock mass using seismic wave velocities derived from electrical resistivity data. In addition, the applicability of the proposed tunnel rock mass classification technique is discussed, by comparing estimated support patterns with actually performed ones. 최근 산악터널의 지반조사에 전기 및 전자탐사를 실시하는 사례가 증가하고 있으며 지반의 전기비저항을 이용한 터널지반의 정량적 평가수법의 필요성이 요구되고 있다. 따라서 본 논문은 암석의 전기비저항과 탄성파속도가 각각 암석의 공극율과 밀접한 관계가 있는 것을 이용하여 지반의 전기비저항으로부터 탄성파속도를 환산하는 수법을 제안한다. 또 이 수법을 이용하여 실제터널에 있어서 지반의 전기비저항으로부터 탄성파속도를 환산하여 암반분류를 행하여 지보패턴을 설정하고 이를 실제 터널시공에 있어서 설정한 지보패턴과 비교함으로써 그 적용성을 검토한다.
이명종,김정호,박삼규,손정술,Yi Myeong-Jong,Kim Jung-Ho,Park Sam-Gyu,Son Jeong-Sul Korean Society of Earth and Exploration Geophysici 2005 지구물리와 물리탐사 Vol.8 No.1
To investigate the feasibility of a new concept of storing Liquefied Natural Gas (LNG) in a lined hard rock cavern, and to develop essential technologies for constructing underground LNG storage facilities, a small pilot plant storing liquid nitrogen (LN2) has been constructed at the Korea Institute of Geoscience and Mineral Resources (KIGAM). The LN2 stored in the cavern will subject the host rock around the cavern to very low temperatures, which is expected to cause the development of an ice ring and the change of ground condition around the storage cavern. To investigate and monitor changes in ground conditions at this pilot plant site, geophysical, hydrogeological, and rock mechanical investigations were carried out. In particular, geophysical methods including borehole radar and three-dimensional (3D) resistivity surveys were used to identify and monitor the development of an ice ring, and other possible changes in ground conditions resulting from the very low temperature of LN2 in the storage tank. We acquired 3D resistivity data before and after storing the LN2, and the results were compared. From the 3D images obtained during the three phases of the resistivity monitoring survey, we delineated zones of distinct resistivity changes that are closely related to the storage of LN2. In these results, we observed a decrease in resistivity at the eastern part of the storage cavern. Comparing the hydrogeological data and Joint patterns around the storage cavern, we interpret this change in resistivity to result from changes in the groundwater flow pattern. Freezing of the host rock by the very low temperature of LN2 causes a drastic change in the hydrogeological conditions and groundwater flow patterns in this pilot plant.