矮寨悬索桥初步方案研究

矮寨特大桥为吉茶高速公路的控制性工程.桥位距吉首市区约20 km,跨越德夯大峡谷.桥位紧邻德夯苗族文化风景区,自然环境优美,地形条件复杂,桥面设计标高与地面高差达330 m左右,山谷两侧悬崖距离从900 m到1 300 m之间变化.推荐方案为262 m＋1 146 m＋124 m的钢桁加劲梁单跨悬索桥,桥梁两端直接与隧道相连,锚碇分别采用重力式锚碇和隧道式锚碇.介绍了大桥方案设计、抗风及岩石力学研究的阶段成果.

Research on Preliminary Plan for Aizhai Suspension Bridge

The Aizhai Extra-large Bridge is a controlling project on Jishou to Chadong Expressway.The bridge site,overpassing Dehang Canyon,is about 20 kilometers away from Jishou City.The bridge site is close to Dehang Miao People's Cultural Scenic Spot,which has beautiful natural environment and complicated topographical conditions.The difference is up to 330?m between the designed elevation of bridge floor and the ground surface elevation.The distance between cliffs on both sides of canyon varies from 900?m to 1?300?m.The recommended scheme is 262?m+1?146?m+124?m steel truss stiffened beam single-span suspension bridge.The ends of the bridge are connected to the tunnel. The anchorage is separately adopted gravity anchorage and tunnel-type anchorage.This paper introduces the bridge plan design and the periodical achievements of wind-resistant and rock mechanics research.