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(사)한국터널지하공간학회

ISSN : 2233-8292

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Vol.12 No.1

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Modeling of rock dilation and spalling in an underground opening at depth

(사)한국터널지하공간학회 / (사)한국터널지하공간학회, (P)2233-8292; (E)2287-4747
2010, v.12 no.1, pp.31-41


& (2010). Modeling of rock dilation and spalling in an underground opening at depth. (사)한국터널지하공간학회, 12(1), 31-41.

Abstract

This paper presents both numerical and physical modeling approaches for the dilation and spalling of rock recognized as typical process of rock around an underground opening at depth. For physical approach, laboratory testing of rectangular beams using a synthetic rock was used to investigate the onset of dilation and spalling. The beams are axially compressed and subjected to 4-point bending to provide non-uniform compressive stresses which are similar to the maximum tangential stress distribution around circular openings. Discrete element numerical analyses using commercial code PFC2D (Particle Flow Code) were performed to evaluate the stress path at various locations in the beams. The findings from these approaches suggest that the onset of dilation in laboratory tests appears to be a good indicator for assessing the stress magnitudes required to initiate spalling.

keywords
암석팽창, 스폴링, PFC, 불연속체 해석, DEM, 4점 휨 시험, Dilation, spalling, PFC, discrete element method, 4-point bending, Dilation, spalling, PFC, discrete element method, 4-point bending

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