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Calculating method and calculating application of forms of debris flow siltation behind silt arresters

A technology for sand dams and debris flow, applied in water conservancy projects, water conservancy engineering equipment, buildings, etc., can solve the problems of not considering the nature of debris fluid, the error between calculation results and actual values, etc., and achieve the effect of effective and simple calculation methods

Inactive Publication Date: 2015-05-20
INST OF MOUNTAIN HAZARDS & ENVIRONMENT CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above method only considers the influence of the original longitudinal slope of the channel on the silted longitudinal slope, but does not consider the nature of the debris fluid itself. The range of coefficient values ​​is relatively wide and has a large randomness, and there is often a large discrepancy between the calculated results and the actual values. error

Method used

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  • Calculating method and calculating application of forms of debris flow siltation behind silt arresters
  • Calculating method and calculating application of forms of debris flow siltation behind silt arresters
  • Calculating method and calculating application of forms of debris flow siltation behind silt arresters

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Embodiment 1

[0037] Such as figure 1 , figure 2 , image 3 shown. A debris flow ditch in Mianzhu is located on the left bank of the Mianyuan River, with a drainage area of ​​1.36km 2 , the highest point in the region is 1987m above sea level, the lowest point is 810m above sea level, and the relative height difference is 1177m; the slope of the ditch bed is 412‰, the length of the main ditch is 2.59km, and the width of the watershed is between 330m and 990m. At 30°~70°, it is partly cliff landform. After the earthquake, large-scale mudslides broke out in the river basin many times. After rushing out of the ditch, the mudslides directly entered the Mianyuan River at the mouth of the ditch. Distant rivers formed mudslides and dammed lakes.

[0038] In order to alleviate the debris flow disaster, it is planned to build a sand control dam in the main ditch of the debris flow. The effective height h of the sand control dam is 12.0m, and the width of the channel is 15.0m. The height of th...

Embodiment 2

[0044] Such as figure 1 shown. A debris flow ditch in Yingxiu is located on the inner side of Duwen Road on the G213 line, on the left bank of the Minjiang River. The ditch is 1.24km long and has a drainage area of ​​0.52km 2 , the average gradient is 722‰, the highest point elevation is 1885m, the lowest point elevation is 943m, and the relative height difference is 942m. After the earthquake, three large-scale mudslides broke out in the ditch, which blocked and silted Duwen Road on the G213 line, causing a large number of vehicles to be stranded and greatly affecting the normal operation of traffic. In order to reduce debris flow disasters, it is planned to arrange a cascaded sand dam group consisting of 10 sand dams in the middle reaches of the debris flow ditch. The effective height h of each sand dam is determined through field investigation, as shown in Table 1. Next, determine the distance between the adjacent dam bodies of the cascade sand retaining dam.

[0045] Fi...

Embodiment 3

[0053] Such as figure 1 shown. The same place as in Embodiment 1 will not be described again, and the difference is that:

[0054] In order to reduce debris flow disasters, a sand dam and a submerged sill are planned to be built in the debris flow tributary ditch. The submerged sill is located at 13.7m in the upstream reservoir of the proposed sand control dam, and the submerged sill is a restricted silting point. The allowable maximum dam height of the sand control dam is determined below.

[0055] Through the measurement and calculation of the large-scale topographic map, it is determined that the slope of the debris flow ditch in this section is θ=23°. internal friction angle of debris fluid The distance xl=13.7m between the limited silting point and the sand check dam, and the channel slope θ=23° are substituted into the allowable maximum sand check dam height formula The maximum allowed height of the sand check dam is calculated to be 5.14m. Accordingly, the effect...

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Abstract

The invention discloses a calculating method and calculating application of forms of debris flow siltation behind silt arresters. The method includes: using methods such as site measuring, indoor geotechnical tests, and large-scale topographic map calculating to determine internal friction angles of debris flows and gully slopes of debris flow gullies; putting obtained parameters into a formula of the forms of the debris flow siltation behind the silt arresters, namely reasonably determining debris flow siltation thickness at different positions in a reservoir; and further determining maximum siltation length and siltation longitudinal slopes of the debris flows behind the silt arresters, and effective length of each silt arrester in the presence of limited silt burying points. Compared with the prior art, gully conditions and self-properties of the debris flows are considered comprehensively, an equation of forms of the debris flow siltation behind the silt arresters is obtained through theoretical derivation, engineering parameters such as the maximum siltation length, the siltation slopes and the permitted maximum arrester height can be determined reasonably, and scientific evidence can be provided for debris flow prevention engineering.

Description

technical field [0001] The invention relates to a method for measuring and calculating the back-silting form of mud-rock flow after a sand check dam, and its application in mud-rock flow disaster prevention and control engineering. Background technique [0002] Debris flow is a common geological disaster in mountainous areas of China. It has the characteristics of sudden occurrence, short duration, ferocious onset, large erosion and silting, and strong destructive power. With the further extension of human economic activities to mountainous areas and the deterioration of the natural environment, the scope and frequency of debris flow outbreaks are increasing year by year, and the harm they bring is becoming more serious. In order to ensure the sustainable development of the mountain economy, it is very important to prevent and control debris flows necessary. [0003] In the prevention and control measures of debris flow, the sand control dam is currently the most widely use...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02B1/00
Inventor 游勇林雪平柳金峰赵彦波
Owner INST OF MOUNTAIN HAZARDS & ENVIRONMENT CHINESE ACADEMY OF SCI
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