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Study on deformation of tunnel pile foundation based on discrete element method and finite difference method
Zhenchu Zhao1, Yuan Zhang2, Fang Dai1
1School of Civil Engineering, Central South University, Changsha, China.
Plos One
|July 18, 2024
Summary
Tunnel excavation significantly deforms piles, weakening foundation bearing capacity. Closer pile-tunnel spacing intensifies pile top displacement, especially with multi-hole tunnels, impacting foundation design.
Area of Science:
- Geotechnical Engineering
- Civil Engineering
- Tunneling Engineering
Background:
- Tunnel excavation can induce significant pile deformation, potentially compromising foundation integrity.
- Understanding pile responses to adjacent tunneling is crucial for infrastructure safety.
Purpose of the Study:
- To investigate the deformation response of piles subjected to the excavation of three-hole, small-spacing tunnels.
- To analyze the influence of pile length, pile-tunnel spacing, and multi-hole tunnel construction on pile deformation.
Main Methods:
- Employed a coupled discrete element method (DEM) and finite difference method (FDM) numerical simulation approach.
- Simulated the deformation process of piles during tunnel excavation under various conditions.
Main Results:
- Decreasing pile-tunnel spacing led to more significant incremental horizontal displacement of the pile top.
- Identified four distinct zones of horizontal displacement concentration around the tunnel.
- Concentrated displacement occurred primarily on the tunnel sides and directly above the excavated area.
Conclusions:
- Pile-tunnel spacing is a critical factor influencing pile deformation during multi-hole tunnel construction.
- Findings offer valuable insights for designing and constructing tunnels beneath existing pile foundations.
- The study provides a reference for mitigating risks associated with shield tunneling near piles.
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