3D Analytical Solution of Soil Deformation Induced By Shield Tunnelling Construction

摘要

Three-dimensional (3D) analytical solution of soil deformation induced by ground loss in shield tunnelling construction was researched. It is put forward that the ground loss ratio is not a fixed value, but changes in driving direction. The calculation formula of ground loss ratio in driving direction was deduced. Based on two-dimensional (2D) analytical solution of uniform ground movement model of shield tunnelling, the three-dimensional analytical solution of ground deformation induced by ground loss is deduced. The settlement in vertical direction and the displacement in lateral horizontal direction at any point can be calculated;;and the method is only applied to the construction phase. In analytical calculation: the predicted soil displacements are in good agreement with the measured values, and the method is easy to use;;the closer the soil to tunnel is, the faster the lateral horizontal displacement changes;;the extent of change of lateral horizontal displacement in longitudinal direction is smaller than displacement in lateral direction.