Research on Deformation Influence of Shield Undercrossing the Existing Metro Double Shield Tunnel

摘要

In the big cities, the shield undercrossing metro project has become critical to the safety of the metro, this paper takes the South-North Water Transfer Project shield under traverse Beijing certain subway project for construction background. It makes technical schemes comparison, analyses the deformation law of the existing subway structure and propoes protective measures to prevent the existing subway structure. The analysis showed the following conclusions: in shield undercrossing the metro project, in order to reduce disturbance on surrounding soils and the existing metro structure, we should take the necessary control measures such as grouting and determine the optimum shield parameters;;the overall trend of the monitoring results accords well with numerical simulation results;;The reason why the actual values and model calculation values has certain deviation is that it is difficult to consider shield parameters such as the pressure of shield thrust, pressures of grouting and so on in numerical simulation.