Evaluation of response mechanisms in an elevated pile group subjected to lateral loading caused by twin-tunnelling

Mukhtiar Ali Soomro, Naeem Mangi, Zhen Dong Cui, Kai Liu, Dildar Ali Mangnejo

Research output: Journal article publicationJournal articleAcademic researchpeer-review

9 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number106334
JournalComputers and Geotechnics
Volume171
DOIs
Publication statusPublished - Jul 2024

Keywords

  • 3D centrifuge modelling
  • Back-analyses
  • Lateral load
  • Pile group
  • Twin tunnelling

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology
  • Computer Science Applications

Fingerprint

Dive into the research topics of 'Evaluation of response mechanisms in an elevated pile group subjected to lateral loading caused by twin-tunnelling'. Together they form a unique fingerprint.

Cite this