Stress-path and piezometric head field analysis of soil during earth pressure balanced shield tunneling

摘要

The effects of earth pressure balanced (EPB) tunneling on the soil stress path and piezometricrnhead of the soil during tunnel advancement are considered in this study. First, the 3D stress distributions of thernarea near the crown and spring line of the tunnel are investigated, after which the tunnel stress path with respectrnto the Mohr–Coulomb yielding surface is presented. Next, by taking into account the three significant factorsrnof a) advance rate of the tunnel face, b) consolidation coefficient of the soil, and c) overburden depth of therntunnel, a parametric study is conducted and the effect of EPB tunneling on the piezometric head field of the soilrnis examined.