Abstract：Abstract：Research purposes：The construction of terminal interchange near tunnel portal often is a large-scale and high-costing project. Based on completed terminal interchange programs, this article makes a detailed analysis about the feasibility of their planning about channel, corridor, plane and profile section, and centralized and uncentralized setting, to find a new way for the construction of terminal interchange near complex-conditioned tunnel portal, to provide reference for high grade highway survey, design and construction.
Research conclusions：(1) In a planning of terminal interchange near tunnel portal, importance should be attached to major controlling factors, avoid missing important programme. (2) It is necessary to further investigate and analyze, first of all, combined with the existing control choose main plane position scheme. (3) Reasonably adjust the main line longitudinal section elevation, to determine the interchange's elevation scope. (4) Compare and select centralized and uncentralized setting interchange scheme. (5) By carefully selecting and continuous optimization, we can work out the best program that can provide us safety, functional perfection, scale-suitability, and environmental harmony. (6) The research results can provide a good guide for interchange program design near tunnel portal under difficult conditions.
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