| In practical engineering of intensive areas in the city will inevitably encountersituations excavation near underground space has been operating or under constructionlight rail tunnel excavation This particular case has increasingly become a popular andgreat significance research.In this paper sets the example of a deep excavation inBeijing that adjacent to the subway tunnel,carried out design studies and numericalsimulation analysis of deep the excavation program.First,combined with practical engineering, the actual situation of engineeringgeological conditions,hydrogeological conditions,the characteristics of the site and thefoundation, traffic conditions and building protection measures to select excavationprogram and determine the use of composite soil nailing walls+undergroundcontinuous wall+composite prestressed anchor support programs;Secondly, using limitequilibrium method and LIZHENG software to design and caculate the program and toanalyze its stability,the results are meet regulatory requirements.Get deep foundation pitdeformation law and interaction with the subway tunne by numerical simulationanalysis based on Midas/GTS limited element software.Finally,comparative analysis ofthe monitoring results,the rationale being calculated results with the results ofexcavation software Midas/GTS simulations,the three are basically the same,indicatingthat the rational design of excavation program, numerical simulation is reliable.According to the research work shows that the support programs which use thecomposite soil nailing wall pit+underground continuous wall+composite prestressedanchor not only can meet the security and stability of excavation also can ensure thenormal operation of the adjacent subway.This support program technically feasible andreasonable economy also can accumulated experience for similar studies of deepfoundation. |
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