Impact of Tunneling on Stress-Displacement Response of Existing Batter Piles

Batter piles up to 45° inclination are used in some giant projects such as bridges, oil platforms, store pits, power plants, vertical car parks, and even some constructed buildings on poor soils. However, the effects of tunneling on the pile tip strength, buckling of piles and surface settlement are various. This research intends to study the stress-displacement behavior of surface ground during tunneling in vicinity of batter piles. Finite Element Method (FEM) has been used to investigate the effect of position and inclination of the piles on the induced surface displacement. After validation and estimation the efficiency of the FE code, model development has been done by comparing the inclination in three degrees (10°, 20° and 30°) and three different lengths of the piles (15m, 21m and 27m). The results showed that in all the lengths and inclinations of piles, the maximum settlement of pile element is higher than the maximum surface settlement and it is higher than the maximum settlement of pile head