RESEARCH ON THE INFLUENCE RANGE OF LARGE DIAMETER SHIELD TUNNELING MACHINE UNDERCROSSING EXISTING LINES IN COMPLEX STRATA
With the continuous development of urban rail transit,shield tunneling through existing structures has become a common phenomenon.However,the protection of existing structures is still a key and difficult point in shield tunneling construction.This study selects an engineering example of a large-diameter shield tunneling through existing subway lines for a long distance in complex strata,simplifies the calculation model,and uses FLAC 3D finite difference software for three-dimensional numerical simulation to analyze vertical deformation.Conduct research on three aspects:longitudinal disturbance and plastic deformation of surrounding rock,analyze the minimum range of increasing protection measures,and strive to provide reference basis for other similar projects.
shield tunnelingnumerical simulationdisturbance range
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