https://scholars.lib.ntu.edu.tw/handle/123456789/576086
標題: | Numerical analysis of tunnel performance in squeezing ground | 作者: | Wang T.-T Huang T.-H. TAI-TIEN WANG |
關鍵字: | Bolts; Numerical analysis; Numerical methods; Shotcreting; Constitutive law; Excavation and support; Excavation sequences; Installation time; Passive supports; Squeezing grounds; Three dimensional effect; Tunnel excavation; Tunneling (excavation) | 公開日期: | 2018 | 來源出版物: | ISRM International Symposium 2000, IS 2000 | 摘要: | This study investigated 18 cases of tunnelling in squeezing ground. The relevant tunnelling methods of various excavation sequences and support systems are reviewed in detail. In addition, a numerical model was established to evaluate the performances of these methods. In the numerical analysis, the strain softening constitutive law of squeezing rocks was considered to simulate the behavior of the media surrounding a tunnel. The factors of three-dimensional effects near the excavation face, excavation sequence and support installation time during tunnelling were also taken into account. The support systems analyzed include not only traditional bolts, steel ribs and shotcrete, but also some newly developed support methods such as yielding bolts, bearing type bolts, adjustable ribs and slot shotcrete. The results of the numerical analysis indicate that step excavation, among which the inner pilot tunnel method might be a better way for tunnel excavation in squeezing ground, can minimize the plastic deformation of the surrounding rock. The support stress can be reduced by the passive support approaches and the performances of various support systems are also presented. Finally, based on the results of this study, some effective strategies for the excavation and support of tunnelling in squeezing ground are recommended. ? 2018 ISRM International Symposium 2000, IS 2000. All rights reserved. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85053899125&partnerID=40&md5=16af9348618ad62734d877055e94cc8f https://scholars.lib.ntu.edu.tw/handle/123456789/576086 |
顯示於: | 土木工程學系 |
在 IR 系統中的文件,除了特別指名其著作權條款之外,均受到著作權保護,並且保留所有的權利。