Numerical analysis and countermeasures of influence of excavation on adjacent tunnels

摘要

With the rapid development of Shanghai railway system and the surrounding commercial development, deep excavation near the underground railway tunnel becomes inevitable. Based on the design proposal of one deep excavation project near Shanghai subway Line No.7 in Baoqing Road, this article aims to predict the dynamic effects of deep excavation on the existing nearby underground railway tunnel by numerical analysis using finite element package ABAQUS. In order to prevent excessive displacement of continuous wall due to the deep excavation, triaxial concrete pile will be used to -strengthen the trench wall and the the bottom of the excavatio n will also be strengthened. After comparison, it is found that t hese strengthening measures can prevent the deformation of ne arby underground tunnel effectively, but special attention is re quired to choose the optimized reinforcing strength.