Study On The Karst Collapse Mode And The Factors Of Collapse In Ying De Df Special Railway Line For Passenger Transport From Wu Han To Guang Zhou

This article take the geological environment and heavy cover karst subsidence along the churchyard line of YingDe by the special railway line of WuGuang .it induce the karst subsidence to four modes and it analyses the process of stress-strain and the subsidence mechanism,then it use the 3-D numerical analysis for the numerical simulation of the reason of karst subsidence by the decline of underground water level. Ultimately, it probes into the prevention and cure of the karst subsidence. We can get several conclusions:(1) The geologic generalization mode of the research zone about karst subsidence: "powder clay + limestone" ; " powder clay + cailloutis soil + powder clay +limestone"; " powder clay + cailloutis soil + limestone"; "cailloutis soil + powder clay + limestone".(2) the failure mechanism of karst subsidence reduce to 2 model, one is the fluctuation of water table, the other is move load.(3) the 3-D numerical simulation of the karst subsidence are used in studying each geologic mode,discussing about the application of Ansys and Flac3D in karst subsidence.it offers several availability approaches for impersonality estimation and forecasting.