Study on the Restraint Effect of Isolation Pile on Surface Settlement Trough Induced by Shield Tunnelling

Isolation piles are widely used to control the influence of shield tunnelling on adjacent buildings as an effective protective measure. However, restraint effect isolation pile surface settlement trough is rarely explored from internal mechanism. Firstly, mechanism investigated pile-soil-tunnel interaction Secondly, based Melan solution and Loganathan formula, analytical under derived. Thirdly, in order satisfy engineering analysis scale reflect friction characteristics between soil particles simultaneously, FDM-DEM coupling technique introduced establish a numerical model including discrete medium continuum medium. Finally, applicability reliability verified by comparing field measured data. The results indicate that will have asymmetric distribution. Surface tends develop more opposite side tunnel when pre-installed one side. findings study substantial theoretical significance reference value.