Analysis of Influence of Shield Tunnel Cutting Building Pile Foundation Groups under Complicated Geological Conditions

With the engineering example of the cutting pile foundation of the Guangzhou Metro shield tunnel passing through office building, three-dimensional models are adopted to conduct finite element analysis on the settlement and deformation responses of the office building during the whole process of the shield cutting pile (before, during and after pile cutting) under complex geological conditions, and the results are then compared with the field test data. Research results indicate that, the settlement and deformation of the shield cutting piles under the office building are within the allowable range, which will not affect the normal use of the buildings. After the shield tunneling is completed, the settlement of the building will last for about 20 days, with small settlement value. It is suggested that the loss of pile side friction affected by shield should be taken into account when calculating the pile end load in the segment design, in order to ensure the safety of both segment structures and buildings.