The Mechanical Behavior Comparison of Horseshoe Tunnel Excavation under the Initial Principal Stress Orientation of Vertical and Rotating 45 Degree

• Main Authors: Wei-De Syu, 許偉德
• Other Authors: Chee-Nan Chen
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/f8br6b

碩士 === 國立臺灣科技大學 === 營建工程系 === 106 === This study analysis the mechanical characteristics of nuclear waste disposal tunnel after excavation with FLAC 5.0 version, the mechanical characteristics including stress, displacement, plasticity development and the factor of safety under excavation in high-strength granite (qu=109 MPa) with different K (K=0.5, 1, 2, 3) and disposal depth (H=300, 400, 500, 600 m) when the orientation of principal stress is vertical and rotating 45 degree.The study shows the plasticity zone will develop at wall and roof of horseshoe tunnel when the K equal to 3 and disposal depth over 300 m under the orientation of principal stress is vertical; the plasticity zone will develop at right corner when the K equal to 3 and disposal depth over 500 m under the orientation of initial principal stress is 45 dgree.