Monitoring and Numerical simulation of a Deep Foundation pit of a Metro Transfer Station in Water-rich Sandstone Strata
XIANG Liang;China Railway First Survey and Design Institute Group Co.,Ltd.;
Based on the excavation project of a metro transfer station in Lanzhou,the deformation law of deep foundation pit engineering in special bad geological conditions( red sandstone layer) is studied based on the analysis of the displacement of fender piles and axial force of the steel supports,and by means of the simulation of the excavation process of deep foundation pit and the comparison of the results of numerical simulation with those of the measurements. The monitoring and numerical simulation results showe that the deformation of the pile presents the shape of a "bow ",most deformation of the pile appears in the surface of excavation; under normal construction,the surface settlement turns to be in a groove shape,and the deformation of the pile shows a triangle in shape in case fender piles are subject to water leak and sand leak; the steel strut axial pressure jumps up to the maximum after the next strut is put in place; where secant pile is used in deep foundation pit engineering as a retaining and sealing structure,the verticality of must be maintained to ensure pile quality; the calculation results are basically agree with the measurements and the numerical analysis provides the basis for the design and construction of foundation pit.
【CateGory Index】： U231.3