지하굴착에서 암반의 강도정수 추정을 위한 역해석 기술동향
Technical Trend of Inverse Analysis to Identify the Strength Parameters of Rock Mass in Underground Excavation
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초록
지하굴착 공사에는 지반의 물리적 특성이 공간에 따라 변하는 불확실성이 필연적으로 개입된다. 설계단계 의 제한된 지반조사로 인해 현장에서 관측된 지반거동과 설계단계에서 예측된 거동간의 차이가 발생할 수 있으며, 그 차이가 현저한 경우에는 굴착설계의 적정성을 재검토할 필요가 있다. 이를 위해서는 현장의 지반거동을 재현할 수 있 는 암반물성이 재산정되어야 하며, 현장계측 자료를 토대로 한 역해석 기법이 활용될 수 있다. 지하굴착 역해석을 수 행하는 주된 목적 중 하나는 공사 및 운영 단계에서의 지반 안정성 검증이고, 이를 위해서는 암반의 강도특성 파악을 위한 역해석의 적용이 필요하다. 본 고에서는 지하굴착 시 주변암반의 강도정수 추정을 위한 기존의 역해석 방법과 관련 최적화 기법을 소개하고, 기존 역해석의 한계점과 개선사항에 대하여 기술하였다.
Abstract
Underground excavation necessarily involves geological materials whose physical properties vary in space. Because of limited site investigation in the design phase, the geotechnical behaviors of rock mass predicted in the design phase may differ from those observed during construction. In case of a significant difference, it is necessary to reexamine the adequacy of excavation design. The material properties of rock mass, which simulates the ground behavior in the field, should be improved. Inverse analysis can be used to reassess the rock mass properties based on field measurements. One of the main purposes of the inverse analysis is to ensure ground stability during construction and operation, and thus it requires an inverse analysis which evaluates the strength characteristics of rock mass. This paper introduced previous approaches for identifying the strength parameters of the surrounding rock mass and the associated optimization techniques, and also described limitations and improvements of the conventional approaches.
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