반구형 지중공동의 수치해석적 안정성 평가
Numerical Stability Evaluation of Underground Semi-Spherical Cavity
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초록
지중공동이 존재하는 지반의 거동은 지반함몰의 위험을 평가할 때 반드시 고려해야 하는 사항이다. 지중 공동 주변 지반의 전단강도를 알더라도 공동의 크기와 같은 기하학적 요소와 관련된 불확실성으로 인해 정밀한 분석이 어렵다. 본 연구에서는 지반의 강도 및 공동의 기하학적 조건들을 바탕으로 무차원 안정 성 상수를 나타내는 도표를 제안하였다. 이를 위해 수치해석이 수행되었으며 안정성 상수는 지반의 강도 정수인 점착력과 마찰각, 그리고 지중 공동의 크기와 심도를 고려한다. 제안도표는 지반 조건을 바탕으 로 현장의 안정성을 추정하는 데 도움이 될 수 있다.
Abstract
The existence of underground cavity should be considered in the assessment of georisk such as ground subsidence. Even if the shear strength of the ground around the cavity is known, it is difficult to accurately analyze the safety around the cavity due to the uncertainties related to geometric conditions such as the cavity size. In this paper, stability chart representing dimen- sionless stability constants was proposed based on the ground strength and geometric condi- tions. Numerical analysis had been carried out accounting for the stability constants such as the ground strength, the adhesion and friction angles, and the size and depth of the under- ground cavity. The proposed charts can help estimating the stability of ground with under- ground circular cavity.
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