지반변위 기반의 역해석을 이용한 지하굴착에서 암반강도 추정
Estimation of Rock Mass Strength in Underground Excavation Using Ground Displacement-Based Inverse Analysis
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초록
현장계측 자료에 기반한 지하굴착 역해석은 굴착설계의 적정성 검증과 유지관리 단계에서 구조물의 안정성 을 확보하기 위해 수행된다. 설계 적정성 및 안정성 분석을 위해서는 굴착주변 암반의 강도특성을 파악할 수 있는 역해 석의 적용이 필요하다. 본 연구에서는 지하굴착 주변암반의 강도를 추정하기 위한 지반변위 기반의 역해석 기법을 제 안하였다. 최적해 탐색을 위한 알고리즘으로서 응답면 기법을 적용하였고, 탐색 알고리즘과 굴착해석 수치코드를 연 계하기 위한 시뮬레이션 툴을 개발하였다. Mohr-Coulomb 탄소성 재료모델에 기반한 지하굴착 예제를 통해 암반강 도 매개변수 추정에 있어서 계측변위 기반 역해석의 유용성을 분석하였다.
Abstract
The inverse analysis of underground excavation based on field measurement data is conducted to reexamine the adequacy of excavation design and to ensure structural stability during operation. For these examination and stability assessment, it requires an inverse analysis which can evaluate the strength characteristics of the rock mass surrounding underground openings. In the present study, a ground displacement-based inverse analysis was proposed that estimates the strength of the surrounding rock mass in underground excavation. Response surface method was employed as a search algorithm for finding an optimum solution. A simulation tool was developed to combine the search algorithm with a numerical code for excavation analysis. The usefulness of the present ground displacement-based inverse analysis in estimating the rock mass strength parameters was investigated through a synthetic underground excavation example based on the Mohr-Coulomb plasticity material model.
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