| Summary: | 碩士 === 國立臺灣科技大學 === 營建工程技術學系 === 86 === The behavior of cross connections between tunnel tubes should be three-dimensional, and is not suitable using two-dimensional numerical simulation, no matter how empirical judge or safety factor includes. Three-dimensional analysis of under different RMR and lateral stress ratio K. The cross section shape of main tunnel is triple-circular-arcs for main tunnel, and horse-shoe for cross connections. The widths of the main tunnel and cross connection are 17 and 7 meters respectively, and the circular centers The research results show that stress concentration is significant around the penetration region of cross connections, and the concentration is higher in the acute side than obtuse side for inclined cross connections. The influential region of cross connections depends on the rock condition, the region increases if RMR decreases, the tendency is significant if cross connections are located on poor rock.
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