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http://dx.doi.org/10.9711/KTAJ.2018.20.6.1003

A study on the behaviour of single piles to adjacent Shield TBM tunnelling by considering face pressures  

Jeon, Young-Jin (Dept. of Civil Engineering, Kangwon National University)
Kim, Jeong-Sub (Dept. of Civil Engineering, Kangwon National University)
Jeon, Seung-Chan (Dept. of Civil Engineering, Kangwon National University)
Jeon, Sang-Joon (Dept. of Civil Engineering, Kangwon National University)
Park, Byung-Soo (Dept. of Civil Engineering, Kangwon State University)
Lee, Cheol-Ju (Dept. of Civil Engineering, Kangwon National University)
Publication Information
Journal of Korean Tunnelling and Underground Space Association / v.20, no.6, 2018 , pp. 1003-1022 More about this Journal
Abstract
In the current work, a series of three-dimensional finite element analyses were carried out to understand the behaviour of a pre-existing single pile to the changes of the tunnel face pressures when a shield TBM tunnel passes underneath the pile. The numerical modelling analysed the results by considering various face pressures (25~100% of the in-situ horizontal stress prior to tunnelling at the tunnel springline). In the numerical modelling, several key issues, such as the pile settlements, the axial pile forces, the shear stresses have been thoroughly analysed for different face pressures. The head settlements of the pile with the maximum face pressure decreased by about 44% compared to corresponding settlement with the minimum face pressure. Furthermore, the maximum axial force of the pile developed with the minimum face pressure. The tunnelling-induced axial pile force at the minimum face pressure was found to be about 21% larger than that with the maximum face pressure. It has been found that the ground settlements and the pile settlements are heavily affected by the face pressures. In addition, the influence of the piles and the ground was analysed by considering characteristics of the soil deformations. Also, the apparent safety factor of the piles are substantially reduced for all the analyses conducted in the current simulation, resulting in severe effects on the adjacent piles. Therefore, the behaviour of the piles, according to change the face pressures, has been extensively examined and analysed by considering the key features in great details.
Keywords
Single piles; Face pressure; Tunnel-soil-pile interaction; Three-dimensional (3D) numerical modelling and analysis; Shield TBM;
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Times Cited By KSCI : 10  (Citation Analysis)
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