Optimized design of Huangfu Aqueduct in Beizhao Irrigation Area
The Huangfu aqueduct is located on the loess plateau in Beizhao Irrigation Area,Shanxi Province.The terrain is heavily dissected and the soil is highly collapsible loess,with slopes prone to collapse.Conventional aqueduct design is susceptible to structural damage due to slope collapse,so it is necessary to optimize the design of the aqueduct structure.Through static and dynamic simulation analysis and multiple adjustments,it is determined to be a through type steel-concrete arch aqueduct.The main arch rib adopts prefabricated variable cross-section rectangular steel pipes,forming a spatial structural system with longitudinal tie beams and wind braces.The rectangular steel pipes of the main arch rib is filled with self-compacting and slightly expansive concrete.The lower section of the main arch ring has a constant-section steel box tie beam structure.The steel box tie beam and arch ring are connected by prestressed steel strands.The steel pipe bridge deck adopts a continuous composite structure of I-beam and channel steels.The arch ring is rigidly connected to the longitudinal steel box,and the arch ring is rigidly supported at the abutments.On both banks,abutment foundation and friction type grouting pile are used.This design combines conventional aqueduct and pipe bridge methods,reducing the weight of the structure and avoiding the risk of structural damage due to landslide.This design achievement provides reference for the design and construction of large-span arch aqueducts under similar unfavorable geological conditions in the water conservancy industry,further promoting the development of large-span arch aqueducts(bridges).
high loess terrace of Yellow Rivercollapsible loessthrough typesteel-concrete arch bridgeself-compacting and slightly expansive concrete