APPLICATION RESEARCH OF BIM GEOLOGICAL MODELING IN LARGE-SPAN TUNNEL

BIM technology plays an important role in the tunnel engineering, and needs to be developed urgently. To explore the application, we established the BIM geological model of the Pingfengling Tunnel. This model based on Revit software and the secondary development plug-in. We compared the model section and the geological section, and studied the model degree of coincidence. We analyzed the design and construction process of the tunnel through the BIM model. The conclusions are as follows:(1)We use plug-in for stratigraphic modeling and civil3d for fault modeling, to facilitate and efficiently build the BIM geological models; (2)When drilling data is lacking, the geological survey data, like geologic sections, can be utilized to add "virtual drilling" to improve the accuracy and reliability of the model; (3)Most areas of the model have a higher degree of coincidence, and areas with large terrain undulations have a lower degree of coincidence; (4)According to analysis, we should excavate the open tunnels on the both sides of the tunnel and use composite lining in the middle section. The fault on the east side intersects the tunnel at a large angle, which needs to be reinforced and seepage-proof to prevent collapse and water gushing.