Citation

Wei G, Hong J, Wei X. Disaster Adv. 2012; 5(4): 4-8.

Copyright

(Copyright © 2012, Shankar Gargh)

DOI

unavailable

PMID

unavailable

Abstract

The Double-O-Tube (DOT) shield is a new tunnel construction method and the characteristics of three-dimensional (3D) soil deformation induced by DOT shield tunneling have not been deeply studied. The formula for settlement calculation caused by soil loss was derived from the random medium theory. Considering the friction between the cutter facade, side and soil the formula for soil deformation was deduced using Mindlin solution. The 3D formula for soil deformation was deduced from a combination of the additional driving positive force with the shell frictional resistance force. From the results it can be concluded after considering various factors that, the calculated values are in good agreement with the measured values. The uplift in front of the shield face is mainly caused by friction between shell and soil. Ground settlement is mainly caused by soil loss and it is laterally in accordance with the normal distribution. This conclusion is significant for practical guidance during DOT shield tunnel construction.