Deep Cut Construction Influence On Adjacent Viaduct

Between zhengzhou xinzheng fast channel reconstruction K0 + 0.000 ~ K1 + 100.000 section, total length of 1.1 Km, whole shows north-south route, wear approach road is located in the beijing-guangzhou railway box culvert under the overpass across jingguang railway separated east and west sides, near to the bridge pier, retaining structure on both sides of the deep cut sections of this study was near to the viaduct and beijing-guangzhou route railway special road section, the diameter of the viaduct bridge pier is 2.0 meters, is buried deeply 55 meters, belong to the large diameter bored piles, and cutting excavation depth of 13.0 meters, 9 meters from the recent bridge pier cutting excavation boundary, most for silt soil, independence is poor, cutting the design and construction of retaining structure is very difficult. In deep cut support construction process to ensure the safety of the viaduct is very important, in this paper, the research will provide certain engineering reference for the similar projects.In this paper, based on the neighbor viaduct bridge pier deep cut supporting project, the supporting structure of deep cut, near to the viaduct bridge pier, and the soil as a whole structure, the finite element software MIDAS/GTS software numerical simulation, the principle is the theoretical calculation, the method of combining to the actual measured data to study the deep cut supporting structure, the stress of the surrounding soil mass and adjacent viaduct bridge pier characteristics and the deformation law and so on, the main work is as follows:1. The load-bearing mechanism of large diameter piles in theoretical analysis and calculation and analysis of its bearing capacity.2. The use of reason is deep foundation pit supporting structure design calculation software cutting.3. The analysis summary field monitoring data and analysis of monitoring results and the theoretical calculation results.4. The finite element software MIDAS/GTS to establish finite element model of fitting with the actual engineering, and the simulation results analysis(stress, strain, etc.), and analyze its influencing factors.Through the above work, it is concluded that the following main research results:1. After supporting design and construction of roadbed, bridge pier of the additional bending moment value lower within 10 kN forced the m, to protect the bridge pier.2. With the increase of deep cut excavation depth of soil, the pile anchor supporting structure deformation, lateral position of maximum horizontal displacement occurred falling. The pile anchor supporting structure lateral curve presents two big, small drum belly shape in the middle.3. It is concluded that with the increase of excavation depth, deep cut soil surrounding influence within the scope of the surface subsidence increases gradually, 7.5 m distance from the deep cut soil excavation border maximum, the surface subsidence and the surface subsidence biggest position does not change, from the deep cut excavation depth 3 times outside the surface subsidence is almost zero.4. It is concluded that deep cut boundary nearest bridge pier deep cut construction influence is big, with the increase of bridge pier distance from the deep cut border, gradually reduce the influence of the excavation of the deep cut.