A Calculation Method of Bulk Density of Debris Flow in Earthquake Area Based on the Size of Solid Particles of Debris Flow

A technology for solid particles and debris fluids, applied in calculation, computer-aided design, instruments, etc., can solve the problems of small actual bulk density value of debris flow, inability to meet the design of debris flow prevention and control engineering in earthquake areas, and low clay content, etc., and achieve the perfect calculation theory. Effect

Active Publication Date: 2020-07-28
SICHUAN COLLEGE OF ARCHITECTURAL TECH
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Problems solved by technology

The source of debris flow ditch in the Wenchuan earthquake area is mainly loose rock and soil particles, with extremely low clay content. The calculation method of debris flow bulk density based on the cumulative percentage of debris flow coarse particles and clay particles results in a relatively small relative to the actual bulk density of the debris flow. , so that the dynamic parameters in the design process of debris flow prevention and control engineering are too low, which cannot meet the needs of debris flow prevention and control engineering design in earthquake areas

Method used

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  • A Calculation Method of Bulk Density of Debris Flow in Earthquake Area Based on the Size of Solid Particles of Debris Flow
  • A Calculation Method of Bulk Density of Debris Flow in Earthquake Area Based on the Size of Solid Particles of Debris Flow
  • A Calculation Method of Bulk Density of Debris Flow in Earthquake Area Based on the Size of Solid Particles of Debris Flow

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Embodiment 1

[0042] Niuquangou is located on the south side of Yingxiu Town, on the right bank of Minjiang River, about 1km upstream to Yingxiu New Town. The shape of the Niujuangou watershed is fan-shaped, with a longitudinal length of 5.4km, an average width of 2.0km, and a watershed area of ​​10.7km 2 . The highest point of the watershed is located on the west side of the survey area, with an elevation of about 2700m, and the lowest point is located at the mouth of the Minjiang River where Niuquangou joins, with an elevation of 858.3m and a relative elevation difference of about 1842m. The channel is generally deep-cut "V"-shaped valley, the main channel is 6124m long, the relative height difference is 1629m, and the average vertical slope of the main channel is 266‰.

[0043] In order to effectively prevent and control debris flow, prevent the Minjiang River from being blocked and threaten the downstream safety, the bulk density of the debris flow outbreak can be obtained in advance, ...

Embodiment 2

[0051] Gaojiagou is located on the north side of Ginkgo Township, on the right bank of the Minjiang River. The main ditch is 3.26km long vertically, 1.3km wide horizontally, and has an area of ​​3.79km 2 , the plane shape is approximately fan-shaped, and the relative height difference of the watershed is about 1807m. The longitudinal slope of Gaojiagou is generally steep, with an average vertical gradient drop of 523‰ in the whole valley. There are 4 tributary ditches developed in the gully domain, the length of the tributary ditches is relatively short, generally between 0.5 and 1.6 km, and the vertical gradient of the gully is relatively large, mostly above 500‰.

[0052] In order to effectively prevent and control debris flow, prevent the Minjiang River from being blocked and threaten the downstream safety, the bulk density of the debris flow outbreak can be obtained in advance, and the effective prediction can be made according to the gradation characteristics of the debri...

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Abstract

The invention discloses an earthquake region debris flow volume-weight computing method based on debris flow solid particle diameters. According to the method, a gully longitudinal slope J of the debris flow gully, debris flow depth h, a gully gradient alpha, debris flow solid particle volume-weight gamma<s>, a viscosity coefficient eta of debris flow and a debris flow solid particle diameter d are determined through field survey, measurement and sampling on a debris flow gully in the Wenchuan earthquake region, extraction of feature parameters of the debris flow gully and other means; and the obtained parameters are substituted into a computing formula to obtain an earthquake region debris flow volume-weight predicted value. Compared with the prior art, the debris flow volume-weight with low clay content in the Wenchuan earthquake region can be reflected reasonably and accurately based on rigorous theoretical derivation, a theoretical basis is provided for debris flow control design in post-disaster reconstruction of the earthquake region, and the computing result is high in precision and meets the practical engineering need.

Description

technical field [0001] The invention belongs to the technical field of design and application of debris flow prevention and control engineering, and in particular relates to a method for calculating the bulk density of debris flow in an earthquake area based on the particle size of debris flow solid particles. Background technique [0002] After the "5.12" Wenchuan Earthquake, a large number of earthquake secondary disasters were induced in the strong earthquake area, and debris flow events of different scales broke out every year in the strong earthquake area, among which "9.26" in 2008, "8.13" in 2010, During the "7.03" in 2011, "7.10" in 2013 and "7.05" in 2016, during the heavy rainfall, multiple large-scale mass debris flow disasters broke out in the strong earthquake area, which brought serious casualties to the strong earthquake area. Injuries and huge economic losses have also brought huge damage to post-earthquake reconstruction projects, and 10 to 15 years after th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/13G06F119/14
CPCG06F30/13G06F2119/06
Inventor 屈永平
Owner SICHUAN COLLEGE OF ARCHITECTURAL TECH
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