盐城市某港区砂土液化评价体系建立

Set up of Sandy Soil Liquefaction Assessment System in a Harbor Area,Yancheng City

砂土液化引起的地基土大变形是港口工程破坏的重要原因。因此,港口地区的液化判别方法选择的合理性、判别结果的准确性就显得尤为重要。针对某港区砂土液化问题,选择临界标贯击数法、Seed简化法、BP神经网络法、基于GIS的液化判别法等四种液化评价方法,进行砂土液化势评价并分析对比,建立基于GIS三维液化评价体系。结果表明:研究区15m以上砂土液化趋势较大,15m以下液化趋势较小。

The large deformation of foundation soil induced by sandy soil liquefaction is a major causation of harbor engineering damage. Thus, rationality of harbor area sandy soil liquefaction discrimination method selection and accuracy of discriminated results are particu- larly important. In allusion to sandy soil liquefaction issue in harbor area, four liquefaction assessment methods of critical standard pen- etration, Seed reduction, BP neural network and liquefaction discrimination based on GIS are selected to carry out sandy soil liquefac- tion potential assessment and contrastive analysis, then set up 3D liquefaction assessment system based on GIS. The result has shown that in the study area, sandy soil above 15m has larger liquefaction potential, while below 15m lesser.