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http://dx.doi.org/10.9711/KTAJ.2017.19.3.389

A study on the effects of ground reinforcement on the behaviour of pre-existing piles affected by adjacent tunnelling  

Jeon, Young-Jin (Dept. of Civil Engineering, Kangwon National University)
Kim, Sung-Hee (Dept. of Civil Engineering, Kangwon National University)
Kim, Jeong-Sub (Dept. of Civil Engineering, Kangwon National University)
Lee, Cheol-Ju (Dept. of Civil Engineering, Kangwon National University)
Publication Information
Journal of Korean Tunnelling and Underground Space Association / v.19, no.3, 2017 , pp. 389-407 More about this Journal
Abstract
In the current work, a series of three-dimensional finite element analysis was carried out to understand the behaviour of pile when the tunnel passes through the lower part of a single pile or group piles. At the current study, the numerical analysis analysed the results regarding the ground reinforcement condition between the tunnel and pile foundation. In the numerical modelling, several key issues, such as the pile settlements, the axial pile forces, the shear stresses and the total displacements near the tunnel have been thoroughly analysed. The pile head settlements of the single pile with the maximum level of reinforcement decreased by about 16% compared to the pile without ground reinforcement. Furthermore, the maximum axial force of the single pile with the maximum level of ground reinforcement experienced a 30% reduction compared to the pile without reinforcement. It has been found that the angle of ground reinforcement in the transverse direction affects the pile behaviour more so than the length of the ground reinforcement in the longitudinal direction. On the other hand, in the case of the pile group with the reinforced pile cap, the ground displacement near the pile tip appears to be similar to the corresponding ground displacement without reinforcement. However, it was found that the pile cap near the pile head greatly restrained the pile head movement and hence the axial pile force increased by about 2.5 times near the pile top compared to the piles in other analysis conditions. The behaviour of the single pile and group piles, depending on the amount of ground reinforcement, has been extensively examined and analysed by considering the key features in great details.
Keywords
Group piles; Ground reinforcement; Single piles; Three-dimensional (3D) numerical modelling and analysis; Adjacent construction;
Citations & Related Records
Times Cited By KSCI : 6  (Citation Analysis)
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