THE DEFORMATION IMPACT ANALYSIS OF SHIELD TUNNEL TRAVERSE THE EXISTING HIGH-SPEED RAILWAY BRIDGE

With the rapid development of the subway construction in recent years, shield through engineering are increasing, especially through the existing dilapidated building (structure), whose deformation is difficult to control. When demanding to control settlement, the shield method is one of the preferred construction methods. Shield construction with many advantages such as better intelligence, construction safety, leak proof, ant seepage, speediness, has become the mainstream construction method of a subway project, river-crossing and sea-crossing tunnel construction. For construction technology of the shield, Chinese and overseas scholars have done a lot of research. In this paper, combined with engineering practice of the Beijing metro line No.14 through the Beijing-Tianjin Intercity railway viaducts, establish the three dimensional solid model of strata - soil structure was established to simulate the shield through the Beijing-Tianjin Intercity elevated bridge construction process by the finite element analysis software ANSYS. The deformation regularity of the existing high railway elevated bridge and track structure was analyzed, and the theoretical analysis method and protective measures of preventing settlement of the existing high railway elevated bridge was proposed.