liquefaction potential
3.The key parameters associated with damage evaluation consist of damaged length, peak ground acceleration, and liquefaction potential index.
4.(3) two algorithms of the BP neural network model both have the higher accuracy for liquefaction potential estimation of sand and LM algorithm is faster than the BP algorithm, but needs more EMS memory in the process of calculation, and therefore, LM algorithm is recommended in this paper;
5.With an analysis of soil liquefaction potential for free field of Nanjing Metro Line 1 under 7 degree earthquake, as well as for excavated field, in line with Railway Engineering Anti-Earthquake Design specification, dynamic triaxial tests and theoretical analysis using efficient stress method, the author comes to the conclusion that, when metro plate is located at layer Ⅱs and the layer is thick, liquefied area is at metro bottom plate; in some local section liquefied area is at metro top plate, or arch sides at the top of metro in most places.
6.The bottom topography and geomorphology in the area are complex,and there are many geologic hazard factors including submarine deep scour channel,buried ancient river course,shallow gas formation,tidal sand ridge and creek,buried ancient steep slope and possible soil liquefaction,which will constitute direct or potential hazards to the marine structures,so attention should be paid to these geologic hazard factors.
