黔张常铁路桥梁总体设计

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Abstract Research purposes:The terrain and geological conditions along the Qianjiang-Zhangjiajie-Changde railway are extremely complex, the soluble rock is widely distributed, and the environmental protection requirements are high. In order to reduce the risk of the construction of karst section, a high line plan is adopted. This paper systematically summarizes the characteristics of bridge engineering under karst geological conditions in complex mountainous areas, studies and gives the principles of bridge structure selection and foundation treatment measures in karst areas, analyzes and summarizes the technical characteristics of two extradosed cable-stayed bridges, and puts forward an economic and reasonable bridge selection for similar bridges.
Research conclusions:(1) The geological conditions of railway in karst mountainous areas are complex, and the selection of bridge structure should be based on the principle of reasonable crossing and effective avoidance. (2) Different measures should be taken to deal with karst caves according to their distribution characteristics. (3) Extradosed cable-stayed bridge has large structural stiffness and excellent dynamic characteristics. Cable stiffening can effectively control the creep deformation of concrete structure, which can be used as the first choice for railway bridges with the same condition. (4) The research results can provide reference for railway bridge design in complex mountainous and karst areas.

Key words： railway bridge long-span high-pier karst extradosed cable-stayed bridge

Received: 11 July 2022

PACS:

U448.13

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Cite this article:

ZHANG Jingli. Overall Design of Bridge of Qianjiang-Zhangjiajie-Changde Railway[J]. Journal of Railway Engineering Society, 2022, 39(10): 42-46.

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https://tdgcxb.crec.cn/EN/ OR https://tdgcxb.crec.cn/EN/Y2022/V39/I10/42

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