Method of calculating maximum scour depth of rear part of debris flow drainage canal transverse sill and applications

Abstract

The invention discloses a method of calculating the maximum scour depth of a rear part of a debris flow drainage canal transverse sill and applications. The calculation method comprises steps: a designed longitudinal slope for the drainage canal, a designed distance between transverse sills, a designed height of the transverse sill over a gully bed, and a designed width for the drainage canal are firstly determined; a debris flow body weight, a gully bed sediment weight, a debris flow viscosity coefficient and a debris flow yield stress are then determined; a debris flow depth and a debris flow velocity are then determined; and finally, according to the maximum scour depth calculation formula for the gully bed at the rear part of the transverse sill, the maximum scour depth of the gully bed at the rear part of the soft foundation energy dissipative-type debris flow drainage canal transverse sill is determined. The method comprehensively considers the gully bed condition and debris flow features, rear transverse sill scour features are also combined, the maximum scour depth calculation formula for the rear part of the drainage canal transverse sill is obtained through theoretical derivation, the maximum scour depth of the gully bed at the rear part of the transverse sill in different conditions can be reasonably determined, a scientific basis is provided for the debris flow disaster prevention engineering design, and the calculation method is simple and convenient and can meet engineering needs.

Description

technical field [0001] The invention relates to a method for measuring and calculating the maximum scour depth of the trench bed at the rear of the rib sill of a soft foundation energy dissipation type debris flow drainage guide groove, and its application in the design of the buried depth of the rib sill foundation in prevention and control engineering. Background technique [0002] Debris flow disaster is one of the main types of mountain disasters, causing hundreds of millions of dollars in economic losses every year. At present, the debris flow drainage channel is an effective engineering measure to prevent and control debris flow disasters. In the long-term practice of debris flow disaster prevention and mitigation, the form of debris flow drainage channels has gradually formed and improved; one of the commonly used forms of debris flow drainage channels is the soft foundation energy dissipation type drainage channel, which adopts separate retaining The combined struct...

AI Technical Summary

Problems solved by technology

According to the "Code for Design of Debris Flow Prevention and Control Engineering" (DZ / T0239-2004), the recommended value of the foundation buried depth of the anti-scour rib sill of the soft foundation energy dissipation type debris flow drainage channel is 1.5-4.0m, and the maximum buried depth is the minimum buried depth value In this case, it is difficult to accurately determine the design burial depth of the rib sill when designing the rib sill of the row guide groove

If a small value is taken in the design, during the operation of the drainage channel project, the rear of the rib sill may be damaged due to the erosion of debris flow, which will lead to the destruction of the drainage channel project; if a large value is taken in the design, it will lead to construction failure. cost increase

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