Geomechanical analysis of surface subsidence development due to construction of deep underground station is presented. The station is a typical pylon structure, which is usually used during construction of the latest subway station in Saint Petersburg. Numerical modeling of step-by-step underground station construction is conducted. The results of the numerical analysis allow to predict the magnitude of surface settlement and understand the wide of settlement trough.
In work the option of the multipurpose underground complex being part of the multystoried high-rise building is considered. The complex settles down in underground part of the building and carries out a base role, replacing with itself the usual plates-but-pile base. Predesigns by a method of final elements taking into account staging of construction of an underground complex and the land high-rise building are executed. Sizes and a picture of distribution of vertical displacements are received as a result of calculations.
In work results of modeling of work of two options of the multipurpose underground complex being the base of the multystoried high-rise building are considered. The complex plays a role of the combined foundation. Modeling is executed taking into account stage-by-stage construction of underground and land part of the building.
Structural spatial concept of subway transferring node for two, three andfour metro lines, which are located in unified underground facility issuggested. Preliminary structural fem design of underground facility isdone. Different construction methods are considered and step by step excavation isincluded in finite element modeling.
Finite element analysis of soil – pile interaction for two different design schemes is done. 3d analysis and stage construction is considered. As the results of FEA modeling vertical displacement of soil and subsidence trough for different stage of construction are drawn and analyzed.
The intelligent technology of designing of the constructions of pillar underground station is adduced. Station is building with applying of low-settle technology, which takes into consideration main stages of the building process. The scheme of interaction of the system «support lining-soil massif» was accepted as basic scheme of calculations. The calculations of the stress-strain condition of constructions was performed with applying of finite-elements method.
Numerical modeling of cast iron lining stress and strain state of pylon deep underground station is done. Due to complex geometry of underground station, step by step excavation and lining installation numerical modeling was done in three dimensional space.
The paper presents results of numerical modeling by application of plastic constitutive models with various failure criteria. The Balmer’s and Balandin’s failure criteria have been elaborated in FISH language and they have been applied to simulate two basic problems which are: compression of rock sample and construction of excavation in rock mass.
Forecast of stress and strain state of deep underground metro stations is considered in this article. A complex approach to study of static work of the metro stations including the in situ testing at different stages of their construction and numerical modeling with finite element method is shown.
Geomechanical forecast of stress-strain state of deep underground subway station is considered. Static work of structures of subway station based on complex approach is shown, including in situ testing and numerical modelling (finite elements method) during different stages of construction.
The intense-deformed condition of one of station complexes of the Saint Petersburg underground testing mutual influence from a trading-entertaining complex located over it is considered.