TY - JOUR
T1 - Evaluation of response mechanisms in an elevated pile group subjected to lateral loading caused by twin-tunnelling
AU - Ali Soomro, Mukhtiar
AU - Mangi, Naeem
AU - Cui, Zhen Dong
AU - Liu, Kai
AU - Ali Mangnejo, Dildar
N1 - Publisher Copyright:
© 2024 Elsevier Ltd
PY - 2024/7
Y1 - 2024/7
N2 - While the effects of tunnel construction on vertical loaded piled foundations have been extensively explored, the impact of side-by-side twin tunnel excavation on laterally loaded pile groups remains less understood in existing literature. This study investigates the repercussions of twin tunnel excavation at various depths on a laterally loaded (2 × 2) pile group, utilizing a combination of three-dimensional centrifuge model tests and back-analyses employing a sophisticated hypoplastic model. The test IDs CD1.5_1.5, CD2.7_2.7, and CD3.7_3.7 represent tunnelling activities near the pile shaft, pile toe, and beneath the pile toe in a side-by-side twin configuration. Twin tunnelling in test CD1.5_1.5 resulted in the most significant lateral movement of the pile cap due to reduced horizontal stress near the pile group shaft. Furthermore, twin tunnelling in test CD2.7_2.7 led to a substantial transverse tilt of 0.5 % for the pile cap, surpassing the recommended 0.2 % limit per Eurocode 7. During the second tunnelling in tests CD2.7_2.7, and CD3.7_3.7, a shift in load direction from upward to downward occurred in pile P2, potentially compromising its integrity. In test CD1.5_1.5, stress reduction near the pile shaft led to pile P1 enduring a bending moment of 1050 kNm at its midpoint, exceeding its capacity of 850 kNm.
AB - While the effects of tunnel construction on vertical loaded piled foundations have been extensively explored, the impact of side-by-side twin tunnel excavation on laterally loaded pile groups remains less understood in existing literature. This study investigates the repercussions of twin tunnel excavation at various depths on a laterally loaded (2 × 2) pile group, utilizing a combination of three-dimensional centrifuge model tests and back-analyses employing a sophisticated hypoplastic model. The test IDs CD1.5_1.5, CD2.7_2.7, and CD3.7_3.7 represent tunnelling activities near the pile shaft, pile toe, and beneath the pile toe in a side-by-side twin configuration. Twin tunnelling in test CD1.5_1.5 resulted in the most significant lateral movement of the pile cap due to reduced horizontal stress near the pile group shaft. Furthermore, twin tunnelling in test CD2.7_2.7 led to a substantial transverse tilt of 0.5 % for the pile cap, surpassing the recommended 0.2 % limit per Eurocode 7. During the second tunnelling in tests CD2.7_2.7, and CD3.7_3.7, a shift in load direction from upward to downward occurred in pile P2, potentially compromising its integrity. In test CD1.5_1.5, stress reduction near the pile shaft led to pile P1 enduring a bending moment of 1050 kNm at its midpoint, exceeding its capacity of 850 kNm.
KW - 3D centrifuge modelling
KW - Back-analyses
KW - Lateral load
KW - Pile group
KW - Twin tunnelling
UR - http://www.scopus.com/inward/record.url?scp=85190746691&partnerID=8YFLogxK
U2 - 10.1016/j.compgeo.2024.106334
DO - 10.1016/j.compgeo.2024.106334
M3 - Journal article
AN - SCOPUS:85190746691
SN - 0266-352X
VL - 171
JO - Computers and Geotechnics
JF - Computers and Geotechnics
M1 - 106334
ER -