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오늘 본 자료
윤성학(Yun Sung-Hak),이건(Lee Kun),사상호(Sha Sang-Ho),박세주(Park Sei-Joo),라일웅(Ra Il-woong),천윤철(Cheon Yoon-chul),조남준(Cho Nam Jun) 한국철도학회 2005 한국철도학회 학술발표대회논문집 Vol.- No.-
The uncemented breccia consisted of conglomerate and breccia, which are not originated from volcanic clastics, shows wide variation of engineering properties depending on the characteristics of matrix of the uncemented breccia. These uncemented breccia have breccia and matrix irregularly distributed according to their depth and position. Clay minerals are also included in the matrix of these uncemented breccia, so they are expected to show expansive behavior and weakness against weathering process. In this study, the volumetric ratio of breccia on the cores had been calculated using digital image processing technique (performed on recovered core box and their sections). The 3-axial compressional strength test had been done with a shaping of rapid cooling method, and the shear strength (c, φ) of uncemented breccia due to the breccia content had been calculated by applying BIMROCK model curve suggested by Goodman. A reliable analysis on the engineering properties of uncemented breccia had been also possible by using borehole density logging and borehole loading test for the accurate determination of the unit weight and the deformation constants deformation modulus.
전기적 잡음이 심한 지역에서 지표-시추공 복합배열 탄성파탐사에 의한 암반등급 산정
김예련(Kim Ye Ryun),사상호(Sha Sang Ho),남순성(Nam Soon Sung),조철현(Jo Cheol Hyun),차영호(Cha Young Ho),박종범(Park Jong Bum),신경진(Shin Kyung Jin) 한국철도학회 2005 한국철도학회 학술발표대회논문집 Vol.- No.-
Rock mass classification by using electrical resistivity tomography(ERT) method is widely performed for the determination of rock support type in tunnel design. In the region of high electrical noise level, however, the result of the ERT will have many erroneous features. In this study, the back ground electrical noise had been measured to find out the reason why the results of ERT in this area did not agree to the expected geology confirmed by boreholes. In order to overcome this limitation of ERT, a hybrid surface-borehole array seismic refraction tomography had been followed. Using this technique, we could get P-wave velocity section including the depth level of tunnel. The comparison of the P-wave velocity and RMR shows fairly good statistical relationship to make it possible to set up the rock mass classification for the entire tunnel line.
경부선 직하부를 나란히 통과하는 도심지 터널에 있어서 지표물리탐사 및 암반등급 평가 사례 연구
이건(Lee Kun),김은덕(Kim Eun-Duk),사상호(Sha Sang-Ho),차영호(Cha Young-Ho),김태영(Kim Tae-Young),정두석(Jung Doo-Suk),황낙연(Hwang Nak-Yeon) 한국철도학회 2005 한국철도학회 학술발표대회논문집 Vol.- No.-
Urban conditions such as underground facilities and ambient noises due to cultural activity restrict the application of conventional geophysical techniques in general. We used the linear array microtremor technique which uses these noises as strong energy source. The result parameter of the survey is shear wave velocity profile which had been applied as an fundamental information for the determination of the rock support type in tunnel design. This study was the first case in Korea which utilized a surface geophysical technique yielding successful result in urban area especially under the existing rail ways. The quantitative relation between the shear wave velocity from this method and the rock mass rating(RMR) determined from the inspection of the cores recovered from the same boreholes showed high statistical relationship. These correlations were then used to relate the shear-wave velocity to RMR along the entire profile.