A Study on Deflection and Stress Path of Deep Excavation in Sand

• Main Authors: Yeh, Hsien-Hui, 葉賢輝
• Other Authors: B.C.Hsiung
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/66499484800949728982

碩士 === 國立高雄應用科技大學 === 土木工程與防災科技研究所 === 98 === In this study, numerical simulation of deep excavation was delivered using two- dimensional FEM program PLAXIS and three underground stations in Kaohsiung metro system, O6, O7 and R5 were selected as the project background. Two constitutive models in the program, Mohr- Coulomb (MC) and Small Strain (SS) were chosen to evaluate ground behaviour. First, the influence on ground responses from change of assumption of groundwater was explored and results from observations and numerical simulation were compared and discussed. In addition, wall deflection path and stress path plotted based on p’ and q’ were produced and discussed. At the end, application of small strain model in the numerical simulation of deep excavation was examined also. Considering the output from this study, it is suggested that the assumption of groundwater indeed affected ground response and the simulation with a reasonable assumption could predict the behaviours close to field observation. Wall deflection path interpreted from observations and numerical simulation can fit each other herein. Moreover, the use of small strain model might not make significant contribution in the prediction of lateral wall movement but it could achieve a certain success in the simulation of surface settlement.