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Mechanics Models of Frost Heaving Damage on Composite Lining Trapezoidal Canal with Arc-bottom

Haibo Jiang, Yuan Zheng

Abstract



The composite lining canal with arc-bottom is widely used in the alpine regions of northern China, mainly due to its superior capacity of resisting frost-heaving damage. However, the design of this composite lining structure is solely experience-based, which makes it extremely difficult to quantify. With the lining trapezoidal canal with arc-bottom as research object, and the friction between the compound geomembrane and the concrete lining structure explicitly considered, this paper establishes mechanics models of frost heaving damage on composite lining canal with arc-bottom, obtains the internal force formula of both the canal slope lining plate and the canal bottom lining plate with arc-bottom, and calculates and checks the thickness of the lining plates. Compared with the concrete lining canal, the addition of compound geomembrane would reduce the tangential force imposed by frozen soil on lining plates, and thus alleviate stress levels on the lining structure and enable an evenly distribution of frost-heave capacity. Consequently, the addition of compound geomembrance could help reduce frost heaving damage, and the underlying mechanisms are also revealed. Compared with the trapezoidal canal, the slope lining plate and the bottom lining plate of composite lining trapezoidal canal with arc-bottom are more integral in structure, and thus are better in serving anti-frost heaving damage purpose. This paper also could provide theoretical basis for anti-frost heaving damage techniques of composite lining canals.

Keywords


Composite lining,trapezoidal canal with arc-bottom,frost heaving damage,mechanics models, frost-heave force

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