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(사)한국터널지하공간학회

ISSN : 2233-8292

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Vol.15 No.6

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Evaluation of rock load based on critical shear strain concept on tunnels

(사)한국터널지하공간학회 / (사)한국터널지하공간학회, (P)2233-8292; (E)2287-4747
2013, v.15 no.6, pp.637-651




& (2013). Evaluation of rock load based on critical shear strain concept on tunnels. (사)한국터널지하공간학회, 15(6), 637-651.

Abstract

After studying the characteristics of three different evaluation methods of rock load; namely theoretical method, empirical method and numerical method, there were too many limitations for them to be applied on tunnels. Therefore, in this research paper, the method based on numerical analysis is selected to use as this method is the most reasonable one since it considers all parameters that are necessary for rock load estimations, and it also considers the interaction between ground and tunnel support. The critical shear strain concept formulated by Sakurai (1981) was used in order to measure exact rock load values based on numerical analysis. Evaluation on a Level 1 rock load height, which is depicted by the stable region in the graph shows that rock load is not affecting between ground grade 1~3, and it was evaluated that the fourth and fifth grades show less values of rock load height which led to the conclusion of a more economical design of concrete lining.

keywords
한계변형률, 한계전단변형률, 지반이완하중, 콘크리트라이닝, 측압계수, Critical strain, Critical shear strain, Rock load, Concrete lining, In-situ stress ratio

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