Numerical Analysis Of The Adjacent Structure In Foundation Excavation Engineering

With the exploitation of underground space and great constructions of high-rise buildings in urban, a large number of deep foundation excavations have appeared, and its scale and depth increase constantly. Many of them are surrounded with dense buildings, which are close to the foundations of existent buildings or structures, so the excavation and support of foundation not only relate to the safety of the foundation, but also yield to impact on adjacent buildings. At present, many scholars, engineers and technicians have already worked a lot in the influences of surrounding environment caused by deep excavations, however, many problems remain not to be solved in correlation among the deformation of the support structures, surface deformation around the excavations and the influence of adjacent structures.Taking the example of the typical geological conditions of Xi'an, the deep foundation excavation is simulated and analyzed by chosen solider piles with soil nailing as the support system in this paper. The deformation of the support structures, soil deformation and the deformation and the inner force of adjacent structures were simulated and analyzed using method of numerical simulation, when the distance between adjacent building and deep foundation is varied.On the basis of the predecessors'studies in this paper, the theories and methods of support design, stability analysis of support system, surface settlement caused by deep foundation excavation are concluded in this paper. It referred the deep foundation excavations, the soil around the excavation and the adjacent building as an integrated system and analyzed the regularity for change of the support structures, the soil around the excavation and adjacent buildings by using FLAC3D .It simulated and analyzed the inner force change of frame structure caused by the deep excavation and the effects of the excavation to the adjacent building by using ANSYS. On the basis, the research result provides a reference for actual engineering design and construction in this paper.