Cave body is the main body of culvert; The end wall or wing wall is located on both sides of the entrance and exit, which plays the role of retaining soil and guiding water, and is a structure to ensure the stability of subgrade or embankment at culvert.
Drainage channels (water channels) under subgrade and pavement allow water to flow under highway. It is used to flood across natural valleys and depressions, or to cross large and small roads as an interchange passage for people, livestock and vehicles, or as a canal to irrigate farmland. Culvert is mainly composed of tunnel body, foundation, end and wing wall.
Extended data:
Duncan hyperbola model is used for the overburden of culvert, and elastic model is used for the foundation. Based on the conditions of force balance and deformation coordination, the calculation method of culvert earth pressure is put forward, and the vertical earth pressure at the top of buried reinforced concrete culvert is calculated, thus the main influencing factors of culvert earth pressure are analyzed.
Reinforced concrete box culvert and circular pipe culvert are closed structures, culvert abutment, cover plate and foundation are integrated, and the section of culvert body is composed of box joints or pipe joints. In order to facilitate drainage, the culvert body should also have an appropriate longitudinal slope with a minimum slope of 0.3%.
The earth pressure coefficient of culvert increases with the increase of elastic modulus of foundation, height-width ratio of culvert and internal friction angle of fill, decreases with the increase of compressibility of fill, and first increases and then decreases with the increase of fill height. When the thickness of the fill is equal to the height of the initial isobath, the earth pressure coefficient is the largest.
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