Numerical Analysis of Deep Excavation in Sandy Soil - Based on the Construction Records of Contract CO2 in the Kaohsiung MRT Project

• Main Authors: Lu Kuan Lin, 呂冠霖
• Other Authors: B.C.Hsiung
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/93545273813893965536

碩士 === 國立高雄應用科技大學 === 土木工程與防災科技研究所 === 96 === In this study, numerical analyses of deep excavation in sand based on case record of SUO06 station of Contract CO2 in Kaohsiung Rapid Transit System are carried out and analytical results are compared with previous works using Mohr-Coulomb (MC) model as well as observations. It shows that no matter choosing MC or Hardening Soil (HS) model, simulated wall deformation is similar. The predicted surface settlement based on HS model is closer to observation rather than the one using MC model. However, analytical surface settlement at the place where far away from the excavation could not fit the reality and this is related to the limitation of small strain behaviour of the model. Further, the effectiveness of sleeve grouting and house protection is examined associated with case record of excavation of O8X shaft of Contract CO2. The damage of the adjacent structure induced by the excavation is discussed also. It is found that the use of sleeve grouting and cross- beam inside the excavation could successfully delay the recovery time of water level and also reduce the influence on ground performances outside the excavation. Further, the induced wall deformation and surface settlement could be restrained also. At last, it is suggested that horizontal strain and angular distortion shall be considered for damage assessment of the adjacent structure for an excavation in sand.