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이혁진(Lee Hyeog Jin),박사원(Park Sa Won),유시동(Yu Si Dong),김홍택(Kim Hong Taeg) 한국지반공학회 2004 한국지반공학회논문집 Vol.20 No.2
For geotechnical applications, engineers use data obtained from a site investigation to interpret the structure and potential behavior of the subsurface. In most cases, these data consist of samples that represent 1/100,000 or less of the total volume of soil. These samples and associated field and lab testing provide the information used to estimate soil parameter values. The resulting values are estimated ones and there exists some likelihood that actual soil conditions are significantly different from the estimates. This may be the case even if the sampling and interpretation procedures are performed in accordance with standard practice. Although these efforts have been made to characterize the uncertainty associated with geotechnical parameters, there is no commonly accepted method to evaluate quantitatively the quality of an investigation plan as a whole or the relative significance of individual sampling points or potential sampling points. In this paper, the geostatistical methods, Inverse distance weighted interpolation method and kriging interpolation method for estimating soil parameter values, are compared with each other to examine the accuracy of these methods. And new method for estimating the long-term settlements is proposed. This method combines the concept of investigation plan thoroughness with geostatistical techniques to develop a spatially sensitive estimate of the site investigation plan quality, referred to as continuous thoroughness, because it applies to geotechnical parameters that exist at every point throughout the sampling area. Finally, the method for locating additional sampling positions is proposed. The approach was implemented using a geographic information system platform(ARC-Info) so that the visual, analytical, and data management benefits of GIS could be utilized for a more detailed analysis.
윤지남(Ji-Nam Yoon),양성돈(Sung-Don Yang),이근하(Geun-Ha Lee),박사원(Sa-Won Park),정헌철(Hun-Chul Jung) 한국암반공학회 2008 터널과지하공간 Vol.18 No.2
본 고에서는 파쇄대가 존재하는 기반암 상부에 지하차도를 계획하는 경우, 하부지반의 지지력 증대 및 침하량 감소 목적으로 적용할 수 있는 기초 보강공법에 대하여 연구하였다. 보강효과 및 적정 설치간격을 수치해석적으로 예측함으로써 실제 시공시 기초자료로 활용할 수 있도록 하였다. 이를 위해, 충청남도 연기군 지역에서 수행된 시추조사, 물리탐사 및 실내 실험결과 등을 분석하여 그 결과로 부터 파쇄대의 물리적, 역학적 특성을 파악하고 지하차도의 지내력을 확보할 수 있는 효과적인 보강대책을 검토하였다. 아울러, 보강사례에서 조사된 공법들 중 이중관 고압분사 공법, 삼중관 고압분사 공법, 마이크로 파일 등의 적정 보강심도를 선정하였으며, 수치해석 (Plaxis8.2 프로그램)을 통해 설치간격 등을 변화시켜가면서 동일한 안정성을 기준으로 가장 효과적인 공법의 제원을 비교ㆍ검토하였다. The rock treatment methods for improving bearing capacity and reducing settlement of the underground roadway structure foundation on fractured rock was studied in this paper. Also, effective reinforcement scheme was evaluated by numerical analysis for the application to the practical construction. Various in-situ and laboratory tests were executed systematically at Yeongi-goon, Choongchungnam-do, Korea, for the purpose of defining the physical and mechanical properties of rock. Consequently the effective treatment methods insuring the bearing capacity of fractured rock were proposed. In addition, the adequate reinforcing depth of the comparatives measure, such as double rod, triple rod injection methods and micropile, were investigated from the case study. Finally, the most effective construction scheme with the consideration of safety and economical aspects were proposed by using numerical analysis(Plaxis ver. 8.2).