›› 2013, Vol. 34 ›› Issue (11): 3055-3060.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Study of effects of tunnel construction on pile group in expansive soil

MA Shao-kun1, 2，WONG K S3，LÜ Hu3，NG CHARLES W W3，ZHAO Nai-feng4   

  1. 1. College of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China; 2. Guangxi Key Laboratory of Disaster Prevention and Engineering Safety, Guangxi University, Nanning 530004, China; 3. Department of Civil and Environmental Engineering, Hong Kong University of Science and Technology, Hong Kong, China; 4. College of Resources and Metallurgy, Guangxi University, Nanning 530004, China
  • Received:2012-10-12 Online:2013-11-09 Published:2013-11-11

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Abstract: A three-dimensional centrifuge model test was carried out to investigate tunnelling effects on pile group in expansive clay. A volume loss of 2% was controlled. During the test, ground settlement trough, additional settlement, additional bending moment and axial force of pile due to tunnelling were monitored. The results show that ground settlement troughs are affected obviously by the distance between the centre axis of pile group and tunnel face. The additional settlement of pile shows linear growth with the tunnel excavation from -0.75D to 1.25D; and it continues to settle even when the tunnel excavation reaches 1.25D away. The settlements of front piles and behind piles are different; and the pile cap tilts. Positive additional bending moment presents at the top of front pile while negative bending moment presents at the bottom. However, only positive additional bending moment occurs at the bottom for behind pile. Moreover, the maximum additional bending moment of the front pile occurs near the axis of tunnel; and it is much bigger than that of the behind pile. The additional axial force of the front pile increases with the tunnel construction and reaches maximum near the axis of tunnel. The additional axial force of the behind pile increases too; but it reaches maximum near the top of pile.

Key words: centrifuge model test, tunnel, pile group, interaction

CLC Number: 

  • TU 443
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