한국지반공학회:학술대회논문집 (Proceedings of the Korean Geotechical Society Conference)
- 한국지반공학회 2008년도 춘계 학술발표회 초청강연 및 논문집
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- Pages.142-152
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- 2008
지반의 전단파 속도 도출을 위한 SPT 업홀 기법의 확립 및 검증
Establishment and Verification of SPT-uphole method for Evaluating Shearwave Velocity of a site
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Bang, Eun-Seok
(Geotechnical Engineering Division, KIGAM) ;
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Kim, Jung-Ho
(Geotechnical Engineering Division, KIGAM) ;
- Seo, Won-Seok (Civil, Environmental, Architecture Engineering, University of Texas at Austin (UTA)) ;
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Kim, Dong-Soo
(Dept. of Civil Engineering, KAIST)
- 발행 : 2008.03.28
초록
SPT-Uphole method was introduced for the evaluation of near subsurface shear wave velocity (Vs) profile. In SPT-Uphole method, SPT (Standard Penetration Test) which is common in geotechnical site investigation was used as a source and several surface geophones in line were used as receivers. 1D shearwave velocity profile can be obtained in the manner of downhole method, Vs distribution map which is the triangular shape around the boring point can be developed by tomography inversion. To obtain the exact travel time information of shear wave component, a procedure using the magnitude summation of vertical and horizontal components was used based on the evaluation of particle motion at the surface. It was verified that proposed method could give reliable Vs distribution map through the numerical study using the FEM (Finite Element Method) model. Finally, SPT-Uphole method was performed and the feasibility of proposed method was verified in the field.