Frost-heave damage checking method of concrete trapezoidal channel during low water level operation in winter

Abstract

The invention discloses a frost heaving damage resistance checking method for a trapezoidal concrete channel during low water level operation in winter. The portion, above the water surface profile in the channel and frozen together with foundation soil, of a concrete side slope plate is regarded as restraint of the portion, below the water surface profile in the channel, of the concrete side slope plate, and the portion, below the water surface profile in the channel, of the concrete side slope plate is regarded as a cantilever structure under water pressure, self-weight and the restraint function of a bottom plate; the bottom plate is regarded as a stressed component under the water pressure and self-weight, the two ends of the bottom plate are restrained by the concrete side slope plate, and the bottom plate is horizontally placed on the foundation soil; the concrete side slope plate and the bottom plate are compared with concrete axial tension strength according to tensile stress generated by the tension bending combination action and tensile stress generated by the pressure bending combination action, and in this way, whether the concrete side slope plate and the bottom plate can resist the frost heaving damage function of the foundation soil of the channel or not is judged. By the adoption of the frost heaving damage resistance checking method to perform frost heaving damage resistance design on a lining layer of the concrete channel under a low water level condition, it can be ensured that the concrete channel has sufficient frost heaving damage resistance, and safe and reliable operation of the concrete channel is guaranteed.

Description

technical field [0001] The invention relates to a method for checking and calculating the anti-frost heave damage of the lining layer of the concrete trapezoidal channel during low water level operation in winter, which is specifically applied to the design of the water diversion channel of the diversion power station in the seasonal frozen soil area and without reservoir regulation upstream. Background technique [0002] In long-distance water transmission projects, concrete anti-seepage canals that enhance the anti-scour capacity of channels, improve water flow conditions, and reduce seepage losses are widely used in my country. However, the concrete-lined canals in cold regions are damaged by cracks, heaves and slumps due to uneven frost heaving and displacement of canal foundation soil. The anti-seepage function of the concrete channel will fail, and the water content will increase due to the leakage of the channel water, which will increase the degree of frost heave dam...

AI Technical Summary

Problems solved by technology

This method not only does not consider the two-way freezing of the canal foundation soil, but also does not consider the influence of changes in the canal water level.

When the water level in the canal is low, although the acting load form is the same as before, it does not completely match the damage phenomenon of the actual canal

Therefore, this method is not suitable for the anti-frost heave damage check calculation of the concrete lining layer of the channel slope during low water level operation in winter

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