STUDY ON GEOENVIRONMENT AND GEOTECHNICAL PROBLEMS OF BADONG YANGTZE BRIDGE

The Badong Yangtze Bridge is a large-sized road bridge across the Yangtze River, linking the No.209 national highway. It lies in middle part of the Three Gorges where geotechnical condition is the most complex. In the bridge area, the landform is cliffy; the valley incised sharply; and the geo-structure is complicated with the rock mass heavily cracked. While landslides and debris-flows are particularly common. By rock structure simulation, the rock discontinuity net and the RQD distributing figure were obtained. Moreover, the slope and groundsill stability about the bridge were analyzed systemically by the elastic-plastic finite element method and plot utmost balance way. At the same time, the influences of the aired and the fractured rockmass on the bridge were discussed. Based on the above, proposals have been made about the pier foundation style, the picket ground's depth and carrying strength. At last, more suggestions for the slope remedy have been put forward.