Journal
INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS
Volume 35, Issue 18, Pages 1949-1971Publisher
WILEY
DOI: 10.1002/nag.989
Keywords
tunneling; pile groups; load transfer; group effect; shielding effect
Funding
- Ministry of Education, People's Republic of China [NCET-06-0649]
- Key Program of Science and Technology Development of Wuhan Rail Transit, People's Republic of China [200860423194]
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Tunnel excavation could influence the working performance of adjacent pile foundations. How to accurately predict the tunneling-induced pile responses is becoming an important issue in urban areas. Previous methods tend to neglect the influence of working loads on the tunneling-induced pile responses. In this paper, a two-stage analysis method is proposed to study the behavior of pile groups with rigid elevated caps subjected to tunneling-induced ground movements, in which the pile-pile interaction, coupling of longitudinal and lateral deformation, and influence of working loads are considered. This method is validated by comparing the results with those from a general pile analysis program, GEPAN, centrifuge test data and field measured data. Thereafter, a series of parametric studies is carried out. The results show that the influence of working load on tunneling-induced pile responses is significant. Three different features of the pile responses will take place for different depth ratios. With the increase in soil stiffness, the tunneling-induced axial force increases linearly, whereas the bending moment increases nonlinearly. For soils with high stiffness, the maximum bending moment increases linearly with the ground loss ratio within the range of 0-5%; but for soils with low stiffness, this tendency becomes obviously nonlinear. Copyright (C) 2010 John Wiley & Sons, Ltd.
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