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Debris flow yield stress and maximum accumulation thickness calculation method

A technology of yield stress and calculation method, which is applied in the field of water conservancy engineering and debris flow prevention engineering

Inactive Publication Date: 2015-07-29
CHENGDU UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

[0006] In view of the problem that the yield stress of fine-grained and coarse-grained debris flow and the maximum deposition thickness of debris flow are not considered in the existing calculation method, the present invention combines the experimental research of fine-grained clay minerals and coarse particles, and determines the undetermined coefficient through the method of inversion , a new calculation method for the yield stress and maximum deposition thickness of debris flow is proposed, which provides a basis for the design of debris flow prevention and control engineering

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Embodiment Construction

[0050] When the formula of the present invention is used to verify other experiments at home and abroad, it has been well verified. The calculation formula two of the yield stress of the new mud-rock flow proposed by the present invention, and existing literature (Ancey, C., and Jorrot, H. (2001) "Yield stress for particle suspensions within a clay dispersion." Journal of Rheology, 45(2):297-319.) Comparing the calculated yield stress values ​​in the Ancey&Jorrot experiment (see figure 1 ), match very well, formula two of the present invention is obviously better than the calculation formula of Ancey&Jorrot (this formula is when the yield stress is bigger, as when the yield stress is more than 100-300Pa, the calculated value is obviously on the low side). In the figure, Ancey&Jorrot 1 is fine sand containing 30% kaolin (d v =0.33mm) experiment; Ancey&Jorrot 2 is fine sand containing 25% kaolin (d v =0.33mm) experiment; Ancey&Jorrot 3: be the polystyrene experiment that conta...

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Abstract

The invention relates to a debris flow yield stress and maximum accumulation thickness calculation method, and belongs to the field of debris flow prevention and control engineering and water conservancy project. The debris flow yield stress and maximum accumulation thickness calculation method has the technical scheme that the equivalent clay mineral percent P in the debris flow body is determined according to the existing debris flow survey, and the equivalent clay mineral percent P in the flow area is set to be unchanged; according to the debris flow volume-weight value of the debris flow in the current time at different frequencies or the debris flow volume-weight value in the adjacent flow areas, the debris flow volume concentration value C0 is obtained through calculation; then, according to the particle grading values Cc and Dv, the equivalent clay mineral percent P calculated in the former step is used for calculation to obtain the debris flow yield stress tao and the maximum accumulation thickness H at different frequencies or in the adjacent flow areas. The method provided by the invention has the advantages that the yield stress and the maximum accumulation thickness of the debris flow occurring at the different frequency or in the adjacent flow areas can be more accurately calculated, and effective technical support is provided for debris flow hazard evaluation and prevention.

Description

technical field [0001] The invention relates to a calculation method for debris flow yield stress and maximum deposition thickness, and belongs to the fields of debris flow prevention and control engineering and water conservancy engineering. Background technique [0002] Most of the towns, villages and other residential areas located in the alpine valley area are built on debris flow or flash flood accumulation fans, and mountain roads, railways and other lifeline projects mostly pass through debris flow accumulation fans. When the debris flow passes through the debris flow circulation area, flows out of the mountain pass and enters the accumulation area, due to the gradual slowing of the slope and the widening of the channel, the movement speed of the debris flow gradually slows down and forms silt in the accumulation area, which may silt the residential areas and lifeline projects on it. For example, after the Wenchuan Earthquake, on September 24, 2008, a large-scale debr...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
Inventor 余斌陈源井
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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