Theoretical study on longitudinal deformation of adjacent tunnel subjected to pre-dewatering based on Pasternak-Timoshenko beam model

In this research, under the disturbance of pre-dewatering, analytical solution vertical displacement adjacent tunnel is derived using two-stage analysis method. first stage, effective stress principle was used to calculate additional caused by dewatering. second Pasternak-Timoshenko beam model simulate interaction between and soil, taking shear deformation into account. By referring calculation results existing literature, correctness proposed method verified, influencing factors longitudinal are further analyzed. The show that with increase distance from dewatering well soil elastic modulus, reduced. increases permeability coefficient. decrease modulus can lead rapid tunnel’s displacement, so stiffness should be considered in its deformation. dropping amplitude water level will surrounding strata. According different relative positions table, there two forms load on tunnel. Before drops axis, Additional gradually increase.