研究生: |
Syiril Erwin Harahap Syiril Erwin Harahap |
---|---|
論文名稱: |
A study of tunnel movement and restricted zone of an existing tunnel adjacent to excavations A study of tunnel movement and restricted zone of an existing tunnel adjacent to excavations |
指導教授: |
歐章煜
Chang-Yu Ou |
口試委員: |
歐章煜
Chang-Yu Ou 林宏達 Horn-Da Lin 鄧福宸 Fuchen Teng 洪瀞 Ching Hung 熊彬成 Bin-Chen Hsiung |
學位類別: |
博士 Doctor |
系所名稱: |
工程學院 - 營建工程系 Department of Civil and Construction Engineering |
論文出版年: | 2020 |
畢業學年度: | 108 |
語文別: | 英文 |
論文頁數: | 138 |
中文關鍵詞: | deep excavation 、tunnel movement 、restricted zone 、settlement influence zone 、consolidation 、creep |
外文關鍵詞: | deep excavation, tunnel movement, restricted zone, settlement influence zone, consolidation, creep |
相關次數: | 點閱:324 下載:14 |
分享至: |
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This study proposed a new restricted zone of the existing tunnel in soft soil that considered the scale of adjacent excavation, the characteristics of tunnel movement, and the settlement influence zone. The rationale was that existing restricted zones did not follow the characteristics of tunnel movement due to an excavation because they only related to the position, diameter, and depth of the tunnel. The time-dependent deformation for a typical excavation in soft clay was evaluated using the finite element analysis. During excavation, deformations normally increase with time, both in the soil excavation time and the elapsed time between excavation stages. The increase may be due to consolidation and/or creep but the mechanism has never been studied comprehensively before. Compared to the measurement, the soft soil creep model could simulate the time-dependent wall deflection and maximum ground settlement properly. Creep had a significant contribution to increasing the wall deflection while consolidation had little effect. Creep also caused a significant increase in the ground settlement both in excavation stages and elapsed times while consolidation caused the ground settlement to rebound slightly during elapsed times. Soil movements in the undrained analysis and the time-dependent analysis had a similar influence zone pattern. Therefore, the characteristics of tunnel movement were examined using the finite element analysis only in the undrained analysis. The proposed restricted zone was within the primary influence zone and for the excavation depth larger than 0.4 times the tunnel depth. If necessary, it could be divided into two zones, namely zone I and II. The zones boundary was on 0.6 times the primary influence zone and for the excavation depth 0.6 times the tunnel depth. The new excavation in zone I or II could cause the tunnel subjected to a high or medium risk of damage, respectively. It was suggested both zones required a tunnel movement evaluation and appropriate improvement measures if necessary. The use of a relatively advanced analysis technique, such as three-dimensional finite element analysis, and more intensive field monitoring were also suggested for excavations in zone I.
This study proposed a new restricted zone of the existing tunnel in soft soil that considered the scale of adjacent excavation, the characteristics of tunnel movement, and the settlement influence zone. The rationale was that existing restricted zones did not follow the characteristics of tunnel movement due to an excavation because they only related to the position, diameter, and depth of the tunnel. The time-dependent deformation for a typical excavation in soft clay was evaluated using the finite element analysis. During excavation, deformations normally increase with time, both in the soil excavation time and the elapsed time between excavation stages. The increase may be due to consolidation and/or creep but the mechanism has never been studied comprehensively before. Compared to the measurement, the soft soil creep model could simulate the time-dependent wall deflection and maximum ground settlement properly. Creep had a significant contribution to increasing the wall deflection while consolidation had little effect. Creep also caused a significant increase in the ground settlement both in excavation stages and elapsed times while consolidation caused the ground settlement to rebound slightly during elapsed times. Soil movements in the undrained analysis and the time-dependent analysis had a similar influence zone pattern. Therefore, the characteristics of tunnel movement were examined using the finite element analysis only in the undrained analysis. The proposed restricted zone was within the primary influence zone and for the excavation depth larger than 0.4 times the tunnel depth. If necessary, it could be divided into two zones, namely zone I and II. The zones boundary was on 0.6 times the primary influence zone and for the excavation depth 0.6 times the tunnel depth. The new excavation in zone I or II could cause the tunnel subjected to a high or medium risk of damage, respectively. It was suggested both zones required a tunnel movement evaluation and appropriate improvement measures if necessary. The use of a relatively advanced analysis technique, such as three-dimensional finite element analysis, and more intensive field monitoring were also suggested for excavations in zone I.
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