1. Project Overview
The project is an important part of the national highway horizontal line G50 Shanghai-Chongqing Expressway, and is also an important transverse highway in Anhui Road Network “Four Lengthways and Eight Transverse Highways”. In the project area, the rivers and lakes are intertwined, and the geological structure and lithology are extremely complicated, accompanied with karst caves, goafs, poor subsoil, landslip, soft foundation, soil caves, collapses, liquefied sand and other bad geological conditions, resulting in great engineering technical difficulties. 161.15km in total length, it is a fully enclosed, bi-directional 4-lane overpass expressway with a design speeds of 100Km/h; it has roadbed of 26m wide and was paved with bituminous concrete.
2. Technical Features and Innovative Points
1) By using project risk management methods, the route planning and risk aversion as well as design under the extremely bad geological environment was adopted; the project is a model demonstration as an environment-friendly, resource-saving and technically-innovative expressway.
2) Specific to the risk potential environment with deep soft foundation along the river, it breaks through the traditional ground treatment methods and adopts a new technique named “dry-vibrating composite pile and composite foundation treatment” to conduct the shallow treatment for deep soft foundation, thus effectively evading a variety of adverse consequences caused by soft foundation, and achieving the maximum profits in protecting the wetland environment, ensuring the bearing capacity of foundation soil and deformation control, and saving the project cost.
3) To tackle the high risk source of the largest underground karst caverns in the history of Anhui highway construction, the project employed the new technique of “exploration and design of pile foundation in karst area” to evade and solve all kinds of risks in the design and construction; an interchange hub is a representative of the extra-large transportation hub in Eastern China.
3. Innovative Achievements
1) Winner of the 11th China Civil Engineering Zhan Tianyou Award
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