Flexible Design Example of Mountain Expressway"Variation Semi-interworking+Turning Lane"
Due to the narrow terrain in mountainous areas,complex geological conditions,multiple restrictive factors,and large terrain height differences,the main line mostly passes through in the form of bridges and tunnels,and the clear line sections reserved for inter-change layout are limited.Many factors have led to extremely difficult layout of the interchange schemes.Under such conditions,if the traditional interchange layout schemes are still adopted,it will result in low safety of the interchange schemes,large engineering scale,difficult construction,and serious environmental damage,making the scheme layout extremely unreasonable.Therefore,for the layout of expressway interchanges in mountainous areas,it is necessary to proceed from the perspective of adapting to local conditions,design flexibly,and not adhere to traditional interchange layout types under the premise of meeting relevant norms and technical indicators.Combined with the actual situation of specific interchanges,various special-shaped interchange types should be conceived to ensure that the layout of interchange schemes is reasonable,economic,beautiful,and coordinated with the natural environment.Relying on the Shigu interchange project of the Yulong(Xionggu)-Weixi Expressway,through the flexible design of adopting the"variant semi-in-terchange+turning lane"interchange type based on local conditions,the engineering scale is effectively reduced,the implementability of the project is improved,and it is more coordinated with the natural environment.
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