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(사)한국터널지하공간학회

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Vol.21 No.5

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A numerical study on the influence of small underground cavities for estimation of slope safety factor

(사)한국터널지하공간학회 / (사)한국터널지하공간학회, (P)2233-8292; (E)2287-4747
2019, v.21 no.5, pp.621-640
https://doi.org/10.9711/KTAJ.2019.21.5.621




& (2019). A numerical study on the influence of small underground cavities for estimation of slope safety factor. (사)한국터널지하공간학회, 21(5), 621-640, https://doi.org/10.9711/KTAJ.2019.21.5.621

Abstract

Quantitative stability assessment of underground cavities can be presented as a factor of safety based on the Shear Strength Reduction Method (SSRM). Also, SSRM is one of the stability evaluation methods commonly used in slope stability analysis. However, there is a lack of research that considers the relationship between the probability of occurrence of cavities in the ground and the potential failure surface of the slope at the same time. In this study, the effect of small underground cavities on the failure behavior of the slope was analyzed by using SSRM. Considering some of the glaciology studies, there is a case that suggests that there is a cavity effect inside the glacier in the condition that the glacier slides. In this study, the stability evaluation of underground cavities and slope stability analysis, where SSRM is used in geotechnical engineering field, was carried out considering simultaneous conditions. The slope stability analysis according to the shape and position change of underground cavities which are likely to occur in the lower part of a mountain road was analyzed by using SSRM in FLAC3D software and the influence of underground cavities on the slope factor of safety was confirmed. If there are underground cavities near slope potential failure surface, it will affect the calculation of a factor of safety. The results of this study are expected to be basic data on slope stability analysis with small underground cavities.

keywords
소규모 지하공동, 수치해석, 전단강도감소기법, 사면안정해석, 잠재파괴면 형상, Small underground cavity, Numerical analysis, Shear strength reduction method (SSRM), Slope stability analysis, Shape of potential failure surface

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