Numerical Stability Evaluation of Underground Semi-Spherical Cavity

Taegeon Lee; Dong-Woo Ryu; Heejung Youn

doi:10.7474/TUS.2022.32.1.020

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2022 Vol.32, Issue 1 Preview Page Next Page

Technical Note

Numerical Stability Evaluation of Underground Semi-Spherical Cavity 반구형 지중공동의 수치해석적 안정성 평가

28 February 2022. pp. 20-29

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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 dimensionless stability constants was proposed based on the ground strength and geometric conditions. 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 underground cavity. The proposed charts can help estimating the stability of ground with underground circular cavity.

Keywords

Stability chart

Underground cavity

Ground subsidence

Numerical analysis

지중공동이 존재하는 지반의 거동은 지반함몰의 위험을 평가할 때 반드시 고려해야 하는 사항이다. 지중공동 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 안정성 상수를 나타내는 도표를 제안하였다. 이를 위해 수치해석이 수행되었으며 안정성 상수는 지반의 강도정수인 점착력과 마찰각, 그리고 지중 공동의 크기와 심도를 고려한다. 제안도표는 지반 조건을 바탕으로 현장의 안정성을 추정하는 데 도움이 될 수 있다.

키워드

안정성 도표

지중공동

지반함몰

수치해석

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Information

Publisher :Korean Society for Rock Mechanics and Rock Engineering
Publisher(Ko) :한국암반공학회
Journal Title :Tunnel and Underground Space
Journal Title(Ko) :터널과 지하공간
Volume : 32
No :1
Pages :20-29
Received Date : 2021-11-05
Revised Date : 2022-01-07
Accepted Date : 2022-01-07
DOI :https://doi.org/10.7474/TUS.2022.32.1.020

Tunnel and Underground SpaceISSN:1225-1275(Print) 2287-1748(Online)한국암반공학회

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