| Title |
Pile Load Transition and Ground Behaviour due to Development of Tunnel Volume Loss under Grouped pile in Sand |
| Authors |
오동욱(Oh, Dong Wook) ; 이용주(Lee, Yong Joo) |
| DOI |
https://doi.org/10.12652/Ksce.2017.37.2.0485 |
| Keywords |
터널굴착;군말뚝;지반거동;축력;체적손실;수치해석 Tunnel excavation;Grouped pile;Ground behaviour;Axial load;Volume loss;Numerical analysis |
| Abstract |
A development of underground space is very useful solution to slove problem occurred from ground surface enlargement in urban areas due to the growth of population, tunnelling is the most popular way and widely used. Researches regarding tunneling-induced pile-soil interactive behaviour have been conducted by many researchers. A study on pile axial force distribution due to tunnelling through laboratory model test, however, is being rarely carried out. In this study, therefore, authors investigate ground behaviour due to tunnelling below grouped pile subjected vertical load as well as pile axial force distribution. A concept of volume loss is used to express tunnel excavation, which is normally applied to 1~2% for tunnelling in soft ground. In this study, however, 10% of that applied to investigate failure mechanism. As a result of laboratory model test, a decrease of pile axial force occurs at 1.5% of volume loss, settlement of grouped pile is 1.2~4.7 times greater than the adjacent ground surface one. Ground deformations at 1.5% of volume loss are measured using Close Range Photogrammetry and compared with results from numerical analysis. |