Method for calculating critical condition of viscous debris flow river-blocking
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A critical condition, debris flow technology, applied in computing, design optimization/simulation, special data processing applications, etc., can solve problems such as poor universality
Active Publication Date: 2017-09-15
CHENGDU UNIVERSITY OF TECHNOLOGY
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[0012] The calculation method and application of debris flow blockage disclosed in this patent document have the characteristics of harmonious dimensions and high accuracy of calculation results, and can accurately judge
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Embodiment 1
[0037] A method for calculating the critical condition of viscous debris flow blocking the river, comprising the following steps:
[0038] a. Calculate the single-width discharge ratio ε between the tributary ditch and the main river according to formula 1;
[0039]
[0040] Among them, Q 1 Single-width discharge of the main river, unit m 2 / s, Q Z Main river flow, unit m 3 / s, according to the survey, combined with the relevant national norms and design tasks to obtain Q Z , B 1 The average width of the main river at the intersection of the main river and the tributaries, in m, obtained by field measurement B 1 ;Q 2 is the single-width flow rate of the tributary, in m 2 / s, Q n is the debris flow flow rate, unit m 3 / s, according to the survey, combined with the relevant national norms and design tasks to obtain Q n , B 2 The average width of the tributary at the junction of the main river and the tributary,
[0041] The unit is m, and B is obtained by fiel...
Embodiment 2
[0055] A method for calculating the critical condition of viscous debris flow blocking the river, comprising the following steps:
[0056] a. Calculate the single-width discharge ratio ε between the tributary ditch and the main river according to formula 1;
[0057]
[0058] Among them, Q 1 Single-width discharge of the main river, unit m 2 / s, Q Z Main river flow, unit m 3 / s, according to the survey, combined with the relevant national norms and design tasks to obtain Q Z , B 1 The average width of the main river at the intersection of the main river and the tributaries, in m, obtained by field measurement B 1 ;Q 2 is the single-width flow rate of the tributary, in m 2 / s, Q n is the debris flow flow rate, unit m 3 / s, according to the survey, combined with the relevant national norms and design tasks to obtain Q n , B 2 The average width of the tributary at the intersection of the main river and the tributary,
[0059] The unit is m, and B is obtained by ...
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Abstract
The invention discloses a method for calculating the critical condition of viscous debris flow river-blocking, and belongs to the technical field of debris flow prevention and treatment engineering. The method comprises the steps of: (a), calculating the per-unit-width flow ratio epsilon of a branch channel to a main river; (b), calculating a volume factor yt; (c), calculating a debris flow yield stress factor x and yield stress; (d), calculating a confluence angle factor as shown in the specification; and (e), judging the river-blocking occurrence probability, wherein when y is less than 0.16, river-blocking cannot occur; when y is greater than or equal to 0.16 and less than 0.3, local river-blocking possibly occurs; when y is greater than or equal to 0.3 and less than 0.46, most river-blocking possibly occurs; and, when y is greater than or equal to 0.46, complete river-blocking possibly occurs. By means of the method disclosed by the invention, in combination with indoor test and field data analysis, the debris flow yield stress and the per-unit-width flow ratio are sufficiently considered; debris flow river-blocking influence factors are nondimensionalized; the method can be suitable for field complex and changeable disaster conditions; the calculation result is accurate; the universality is high; and scientific guidance can be provided for preventing and treating debris flow river-blocking.
Description
technical field [0001] The invention relates to the technical field of mud-rock flow prevention and control engineering, in particular to a method for calculating critical conditions for viscous mud-rock flow blocking rivers. Background technique [0002] Debris flow refers to the landslides caused by heavy rain, snowstorm or other natural disasters in mountainous areas or other areas with deep valleys and steep terrain, carrying a large amount of sand and stones. Its area, volume, and flow are large, while landslides are small areas of diluted soil mountains. Typical debris flows are composed of viscous mud with coarse solid debris suspended and rich in silt and clay. Under appropriate terrain conditions, a large amount of water soaks the solid accumulations in the flowing water hillside or ditch bed, reducing its stability, and the solid accumulations saturated with water move under their own gravity, forming a debris flow. [0003] Debris flow is a disastrous geological ...
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