Research on calculation of post-construction transverse surface settlement caused by shield tunneling

Due to the excess pore water pressure dissipation,the post-construction surface settlement will be continued caused by shield tunneling.Based on past research,a calculation method of initial excess pore water pressure around the tunnel is put forward.By using layerwise summation method,the surface consolidation settlement can be got within disturbed region of excess pore water pressure dissipation.Combining with the surface settlement in tunnel construction phase,total transverse post-construction surface settlement is obtained.The total surface settlement after soil consolidation is proposed;and surface settlement rate changes over time are also studied.As is shown in analytical calculation,the calculated results of the transverse surface settlement curves are in good agreement with the field data;and they are also in accordance with the normal distribution law.The development of total surface settlement rate is in good agreement with the field data.