Abstract: Defects such as the stratigraphic modeling method cannot divide the sequence when the layer exposed by the borehole is complex, and the continuous and smooth interlayer interface cannot be guaranteed exist in the modeling methods of Earth Volumetric Studio（EVS） and lithologic modeling method, respectively. Hence, an EVS stratigraphiclithologic modeling method with the ability to express complex lens and clear geological layers at the same time is proposed by taking Qingxiushan StationBoyi Road Station section of Nanning Rail Transit Line 3 for example. The method is compared with stratigraphic modeling and lithologic modeling and cross validated through engineering examples. The results indicate that the model established by stratigraphiclithologic modeling method can reflect the actual geological conditions better than that by stratigraphic model and lithology model respectively, and show higher accuracy. The relative error and root mean square error of the proposed model are significantly lower than those of the stratigraphic modeling.

Key words: 3D geological modeling, Earth Volumetric Studio（EVS）, metro line, lithology model, urban rail transit