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Method for predicting damage angle of gully accumulation body in water-saturated state

A prediction method and accumulation technology, applied in prediction, instrument, data processing application, etc., can solve the problem of debris flow prevention and control in earthquake areas, low clay content, stability evaluation of debris flow channel deposits, and debris flow prevention and control design errors, etc. problem, to achieve the effect of perfect computing theory

Active Publication Date: 2017-11-07
SICHUAN COLLEGE OF ARCHITECTURAL TECH
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Problems solved by technology

The deposits of debris flow channels in the Wenchuan earthquake area are mainly loose rock and soil particles with extremely low clay content and large internal porosity of the deposits, which makes the empirical value of the damage angle of debris flow channel accumulations inapplicable in the earthquake area, making debris flow channels There were errors in the stability evaluation of road deposits and the design of debris flow prevention, which could not meet the needs of debris flow prevention in earthquake areas

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  • Method for predicting damage angle of gully accumulation body in water-saturated state
  • Method for predicting damage angle of gully accumulation body in water-saturated state

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[0032] 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‰.

[0033] 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, ...

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Abstract

The invention discloses a method for predicting the damage angle of a gully accumulation body in a water-saturated state. The method comprises the following steps: performing field investigation, measurement and sampling of a debris flow groove in a seismic zone, and extraction of characteristic parameters of the debris flow gully; determining the volume weight of the accumulation body [gamma]S in the debris flow gully, the thickness of the accumulation body h, the saturated internal friction angle [theta] of the accumulation body, the porosity [epsilon] of the accumulation body, the thickness [delta]h of any accumulation body, and the gradient of the gully bed [alpha]; and substituting the obtained parameters into the formula to determine the damage angle of the accumulation body of the debris flow gully in the seismic zone in the water-saturated state. Compared with the prior art, the invention is based on rigorous theoretical derivation, which can reasonably accurately reflect the damage angle of the accumulation body in the debris flow gully in the Wenchuan earthquake area under rainfall-saturated conditions and provide a theoretical basis for the prevention and control of the debris flow in the post-earthquake reconstruction. The calculation result is high-precision and meets the need of actual project.

Description

technical field [0001] The invention belongs to the technical field of debris flow prevention and control, in particular to a method for predicting the damage angle of channel accumulations in a saturated state, which is used to predict the stability of debris flow channel accumulations in an earthquake area in a rainfall event. Background technique [0002] After the "5.12" Wenchuan Earthquake, a large number of earthquake secondary disasters were induced in the strong earthquake area. Debris flow events of different scales broke out every year in the strong earthquake area. The external factors controlling the initiation mechanism of debris flow are mainly water-saturated liquefaction of provenance, pore water pressure, underground seepage, and surface runoff erosion. In order to ensure the sustainable economic development of the Wenchuan earthquake area, it is particularly important to study the damage angle of debris flow channel deposits in the earthquake area for the p...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06Q10/04G06Q50/26
CPCG06Q10/04G06Q50/26
Inventor 屈永平
Owner SICHUAN COLLEGE OF ARCHITECTURAL TECH
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