Influence of hydraulic factors on the inner forces of rigid lining of trapezoidal water conveyance canal in winter during frost heaving
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Abstract:
We tested in practical engineering the mechanical model of slope concrete slabs of winter water conveyance canals during the frost heaving of the bedsoil. Then we theoretically analyzed the influence of slope angle, water depth, and lining thickness on the inner forces of the rigid lining of the canal under the condition of a specific type of frost heaving force and calculation method. Results showed that the slope slab of the canal had a tendency to move upward along the slope during frost heaving of the bedsoil in winter. On the premise of overall stability of the slope, the innerforces and probability of canal damage due to frost heaving could both be greatly reduced by increasing slope angle, reducing canal bottom width, and rising water level. It is inadvisable to increase the slope slab thickness as a way to increase the frost heaving resistance capacity of the canal. The research findings can provide a new method for the anti-frost heaving design of water conveyance canals without ice cover in winter in seasonally frozen region. To design and adjust the hydraulic parameters of the canalso as to increase the water depth within the canal can reduce the probability of frost heaving damage to the canal, and can reduce the canal land area and earthwork volume.
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