考虑刀盘影响的饱和土盾构对地层干扰分析

In order to study the disturbance of saturated soil during shield construction,based on the existing research,the initial displacement solution of soil and the solution of pore pressure are obtained by BIOT consolidation equation transformation.Through coordinate transformation,the solution of vertical deformation and pore pressure of saturated soil caused by front face friction of cutter head and side friction of cutter head,including panel-type cutter head and spoke-type cutter head,is derived.Analytical formulas are used to simulate the factors causing soil deformation,and the expressions of total vertical deformation and pore pressure of saturated soil are given.Combined with engineering examples,the calculation and simulation show that the settlement curves of additional thrust,shield shell friction,and soil loss are symmetrically distributed in the direction perpendicular to the shield driving direction,and the maximum value is concentrated directly above the shield axis.The frontal and lateral frictions of the shield cutter head produce asymmetric surface deformation on both sides of the shield axis,while the cutter head factor above the shield axis has little effect on the surface deformation.There is little difference between the two types of cutters on the surface deformation.The response of the spoke-type cutter head to the pore pressure around the tunnel is obvious at the section where the cutter is located,and the attenuation along the shield direction is faster.