Measuring and calculating method for length of deep pool segment of step-deep pool type debris flow drainage canal

A technology for draining guide troughs and debris flows, applied in water conservancy projects, artificial waterways, buildings, etc., can solve problems such as the inapplicability of the projection distance formula, few considerations, and failure to reasonably determine the length of the deep pool section

Active Publication Date: 2015-12-23
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 length of the deep pool section can be determined by referring to the formula of projecting distance after the debris flow passes through the dam, but this formula is a statistical empirical formula with few considerations; in addition, the stepped section of the ladder-deep pool structural debris flow drainage channel has certain longitudinal slope, which also makes the projection distance formula after the debris flow past the dam inapplicable
Therefore, there is currently no method to reasonably determine the length of the Shentan section

Method used

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  • Measuring and calculating method for length of deep pool segment of step-deep pool type debris flow drainage canal
  • Measuring and calculating method for length of deep pool segment of step-deep pool type debris flow drainage canal
  • Measuring and calculating method for length of deep pool segment of step-deep pool type debris flow drainage canal

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Embodiment 1

[0064] Such as figure 2 shown. A debris flow ditch is located in Xincheng District, Jiuzhaigou County, Sichuan Province, and is a tributary ditch on the left bank of Baishui River, a tributary of the upper reaches of Jialing River. Groove area: 23.41km 2 ; The length of the main ditch: 8.20km; the elevation of the highest point: 3643m; the elevation of the mouth of the ditch: 1402m; the relative height difference: 2200m; The watershed of the ditch is "thin and wide", with a wide upper reaches and gradually tightens downwards. Its shape is similar to a fan. There are two main threat areas, Shuanglong Village in the middle reaches and Xincheng District in the lower reaches. Thousands of residents and roads in the watershed , Buildings may be directly or indirectly affected by mudslides.

[0065] In order to effectively guide debris flow, prevent debris flow from harming residents and buildings, and reduce debris flow disasters, it is proposed to build a ladder-deep pool type...

Embodiment 2

[0079] Such as figure 2shown. A debris flow ditch is located in the northwest of Mianzhu City, on the left bank of the Mianyuan River. It is a typical representative of debris flow ditch with multiple sources, large gradient and small watershed after the earthquake. Groove area: 1.36km 2 ; Main ditch length: 2.59km; highest point elevation: 1980m; ditch mouth elevation: 960m; relative height difference: 1020m; average vertical gradient: 625‰. Before the earthquake, the ditch was a mountain torrent ditch. After the "5.12" earthquake, the middle and upper mountain body produced a collapse debris flow, which accumulated in the ditch and formed a debris flow under the action of rainfall. From June 2008 to September 2011, a total of 5000m 3 More than 10 times of the above mudslide activities not only buried the Hanwang-Qingping Highway, the lifeline of the ditch mouth, but also blocked the Mianyuan River many times, forming a mudslide barrier lake. After engineering treatment,...

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Abstract

The invention discloses a measuring and calculating method for the length of a deep pool segment of a step-deep pool type debris flow drainage canal. According to the measuring and calculating method, firstly, the unit weight of a debris flow body, the designed longitudinal slope of the drainage canal, the casting angle of debris flow, the designed suspension height of a step segment, the designed width of the drainage canal and the designed peak flow of the drainage canal are determined; then the roughness factor of the drainage canal, the permissible velocity and the overflowing mud depth of the debris flow are determined; afterwards, the average velocity of a debris flow cross section is determined, and the permissible velocity is compared with the average velocity of the debris flow cross section; and finally, the length of the deep pool segment of the step-deep pool type debris flow drainage canal is determined through a measuring and calculating formula of the deep pool segment. Proceeding from the complete movement process of fluid in the canal, the method is based on strict theoretical derivation, and the influence of the properties of the debris flow on the casting range is considered in combination with experiments, so that the length of the deep pool segment of the step-deep pool type debris flow drainage canal is determined reasonably, and a basis is provided for the design of the step-deep pool type drainage canal; the precision of a calculated result is high; the method is adapted to the actual requirement of engineering.

Description

technical field [0001] The invention relates to a method for measuring and calculating the length of the deep pool section of a ladder-deep pool structure type debris flow drainage channel suitable for a large ditch bed longitudinal gradient. Background technique [0002] Geological disasters occur frequently in our country. Debris flow, as one of the main mountain disasters, has seriously affected people's life and property safety, production and life, and has also had a certain restrictive effect on the economic development of mountainous areas. Especially after the "5.12" Wenchuan Ms8.0 earthquake, the debris flow activities in the earthquake area have the characteristics of easy blockage, low critical rainfall, high frequency, and high bulk density due to the rich source of matter and superior topographical conditions. The debris flow activities are concentrated in the basin area <5km 2 1. The vertical slope of the channel is > 20%, or even 50% on the channel or s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02B5/00E02B5/02
Inventor 李云陈晓清陈剑刚赵万玉李昆于献彬王小军
Owner INST OF MOUNTAIN HAZARDS & ENVIRONMENT CHINESE ACADEMY OF SCI
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