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  Research on a new device used to decrease excess pore water pressure of soil around shield tunnels

  Grouting is important for shield tunneling as grouting material fills the adverse gap between segments and the surrounding soil. Generally, high grouting pressure will lead to large segment stress. In order to reduce the stress and deformation of segment, extra soil is usually removed behind the segment through a prefabricated hole located in the middle of each segment. However, this method may lead to excessive soil disturbance. In order to avoid these disadvantages, this paper studies a new device - an infiltration rod, to reduce the excessive pore pressure. This paper shows the numerical simulation results of the infiltration rod. The FLAC3D is used to simulate the whole construction process, so as to estimate the time of dissipation and distribution of the pore pressure around the infiltration rod. By using the infiltration rod, we can inject more grout without significantly increasing the grouting pressure. On one hand, the gap between the segment and the soil is filled more densely; on the other hand, pore water discharge by the infiltration rod increases soil consolidation, thus improving the strength of the surrounding soil. Pore water pressure, Effective stress, Infiltration rod, Numerical simulation.

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