Analysis of Soil Deformation Induced by Shield Grouting Considering the Cavity Diffusion
Based on the Mindlin fundamental solution of elasticity and coordinate transformation,assuming that syn-chronous grouting slurry at the shield tail is a Newtonian fluid,and considering the uniform circular diffusion of the grouting slurry in a certain thickness range along the cylindrical surface,the solution for the vertical displacement of the soil caused by the vertical and horizontal components of the grouting pressure is obtained.Taking the shield con-struction section of a project as an example,the vertical displacement caused by simplifying the grouting pressure to uniformly distributed load and the vertical displacement caused by the cavity diffusion are calculated,respectively.The analysis results show that:the displacement curves of the soil calculated by the two methods all present a normal distribution,and the closer to the grouting surface,the greater the upheaval of the soil;when considering the cavity diffusion of the grouting pressure,the calculated value of surface upheaval is about 3 times of the uniform grouting pressure;The displacement formula considering the cavity diffusion includes parameters such as grouting pressure,grouting time,grouting aperture and grout characteristics.By adjusting these parameters,the soil deformation caused by grouting at shield tail can be improved.
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