Excess Pore Water Pressure and Ground Consolidation Settlement Caused by Grouting of Shield Tunnelling

Abstract

This study investigates the effect of shield tunnel grouting on excess pore pressure distributions around tunnel and ground consolidation settlement. First, it presents half-plane excess pore pressure around an unlined tunnel caused by grouting pressure based on the complex variable theory and the conformal mapping method. Second, the analytical solution for the soil consolidation is derived using the conformal transformation method and the consolidation theory of Terzaghi–Rendulic. The drainage conditions of the tunnel lining are idealized into three cases: fully drained, partially drained, and impermeable along the tunnel circumference. The impacts of the burial depth of the tunnel, the permeability coefficient of the tunnel lining and the surrounding soil, the Poisson’s ratio of the soil, the lateral Earth pressure coefficient of the soil, and the shear modulus are investigated.

Experimental Study and Simulation Analysis of Slurry Filling Process of Shield Tail Synchronous Grouting

“…ere are also many scholars who simulate the synchronous grouting process, mainly by building models for simulation analysis and studying the influence of various factors on the synchronous grouting process. Zhang et al [9] idealized the drainage conditions of the tunnel lining into three conditions: full drainage, partial drainage, and impermeability. Surface settlement and pressure distribution around the tunnel under the influence of lateral Earth pressure coefficient, shear modulus, and other factors were studied.…”