Volume 21 Issue 3
Jun.  2013
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XIONG Hao, LIU Run, XU Yu. 2013: CHARACTERISTICS AND 3D NUMERICAL SIMULATION ANALYSIS OF UPLIFT PILE BEARING CAPACITY IN URBANS. JOURNAL OF ENGINEERING GEOLOGY, 21(3): 400-407.
Citation: XIONG Hao, LIU Run, XU Yu. 2013: CHARACTERISTICS AND 3D NUMERICAL SIMULATION ANALYSIS OF UPLIFT PILE BEARING CAPACITY IN URBANS. JOURNAL OF ENGINEERING GEOLOGY, 21(3): 400-407.

CHARACTERISTICS AND 3D NUMERICAL SIMULATION ANALYSIS OF UPLIFT PILE BEARING CAPACITY IN URBANS

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  • Received Date: 2012-10-20
  • Rev Recd Date: 2013-03-03
  • Publish Date: 2013-06-25
  • With the development of urban construction, underground structures including subways, underground parks and underground markets have become more and more widespread. Their development trends are diversified, complicated and deep-going. It can be known that anti-floating stability of underground structures become an outstanding problem. So, one of main project measures is to set up uplift piles. This paper mainly analyzes the ground failure mode of uplift pile and pile group, and reveals the work mechanism of uplift pile. The mode of uplift pile and pile group is numerically simulated using ABAQUS finite element software. The influence factors of uplift capacity and pile group effect are investigated in different aspects such as pile stress, soil around pile and pile side resistance. It further studies the effect of the distance-diameter ratio of uplift pile group on uplift capacity and foundation deformation combined with practical works. The analyzing results show that, under the action of uplift force, pile stress mainly acts in axis, which decreases with increasing radius and depth. The pile side friction force decreases gradually from upper depth to lower depth. It increases with increasing upward displacement. When the distance-diameter ratio() of foundation pile decreases, the capacity reduction factor() increases, the pile group effect is more significant, and there is an uplift trend in piles and soil between piles that go against the anti-floating stability of construction.=3 and =6 can be used as the limit ti determine the degree of pile group.
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