Method for discriminating blocking type of window dam in debris flow interception process and application thereof

A discrimination method and technology of debris flow, applied in water conservancy engineering, marine engineering, coastline protection, etc., can solve problems such as lack of theoretical basis and technical indicators

Active Publication Date: 2013-10-09
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

[0004] However, there are few studies on the critical conditions of window dam occlusion types and their sand-retaining performance. The design of window dams is still based on the designer's experience and hydraulic design methods, and the theoretical basis and technical indicators are still lacking.

Method used

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  • Method for discriminating blocking type of window dam in debris flow interception process and application thereof
  • Method for discriminating blocking type of window dam in debris flow interception process and application thereof
  • Method for discriminating blocking type of window dam in debris flow interception process and application thereof

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Embodiment 1

[0034] The Xiaogangjian debris flow disaster site is located on the right side of the Hanqing section of Mianmao Road, on the left bank of the Mianyuan River, and about 5.0km southeast of Qingping Township. The watershed area of ​​Xiaogangjian is 1.36km 2 , the main ditch is 2.59km long, and the longitudinal slope gradient of the ditch bed is 412‰. The danger zone of the Xiaogangjian debris flow is mainly distributed in the gully mouth section of the debris flow and the areas that may be submerged and silted along the upper and lower reaches of the Mianyuan River. In order to protect the Mianmao Highway and other infrastructures passing through this section, a debris flow prevention and control project was built in Xiaogangjian, among which the No. 1 sand control dam of the main ditch is a typical window dam.

[0035] The effective storage height of the No. 1 dam of the main ditch is 12.5m, the total length of the dam crest axis is 38.2m, the dam crest width is 3.0m, the upst...

Embodiment 2

[0039] Xiaojiagou is located in Yingxiu Town, Wenchuan County. The geographic coordinates of the mouth of the ditch are 103°26′20″ east longitude and 31°04′32″ north latitude. The average longitudinal length of Xiaojiagou debris flow ditch is 4.50km, and the ditch area is 7.19km 2 . The elevation of the highest point of the ditch is 3483m, the elevation of the lowest point of the ditch mouth is 1080m, and the relative height difference is 2403m. The threat objects of the Xiaojiagou debris flow are mainly the safety of the downstream Yingxiu Town and the S303 Yingxiu Section of the Mizoguchi Road.

[0040] In order to effectively control the debris flow, prevent the debris flow from blocking the river, intercept the debris flow and stabilize the ditch bed, and reduce the disaster of the debris flow, a window dam is planned to be built in the Xiaojiagou ditch. The purpose of the window dam is to intercept debris flow materials and stabilize the ditch bed and bank slope. Theref...

Embodiment 3

[0045] Xiaogou is located in Minyinxing Township, Wenchuan County, at the mouth of the ditch on the opposite bank of G213 National Highway K5+700m on the right bank of the river. The geographic coordinates are 103°18'26.3" east longitude and 31°05'31.9" north latitude. The small ditch is a new type of debris flow ditch with high frequency rainstorm. The mudslide threatened Goukou-Ergou Hydropower Station, Sanli Power Plant, Dongjienao Village, a total of 115 households, and G213 National Highway traffic, threatening assets of about 60 million yuan, and the danger was large.

[0046] In order to protect the above-mentioned threatened objects, multiple window dams were built in the small ditch. Among them, No. 4 dam is arranged in two rows of 17 openings (8 in the upper row and 9 in the lower row) according to the shape of a character. The net distance is 3.0m, the net distance between rows is 2.5m, the total area S of the cross-section of all openings of the window dam 0 13....

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Abstract

The invention discloses a method for discriminating the blocking type of a window dam in a debris flow interception process and application thereof. According to the method, the blocking type of the window dam is discriminated according to the type of debris flow, the grain size d 95 of debris flow solid matter, the opening width b of the window dam, the opening height h of the window dam, the total area S0 of the cross sections of the openings of the window dam, the cross section area S below the effective height of the window dam within channel width. The method can be used for verifying the blocking type of the window dam or guiding the opening design of the window dam. Compared with the prior art, the opening width, the opening height and the total opening area are taken into consideration, the influences of the opening width, the opening height and the total opening area on the blocking type of the window dam are reflected completely, and the blocking type of the window dam can be distinguished reasonably. Further, the method for discriminating the blocking type of the window dam in the debris flow interception process supplies basis to window dam design and meets the actual engineering demands.

Description

technical field [0001] The invention relates to a method for discriminating block types of debris flow intercepted by a window dam and its application in debris 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 also 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 the most widely used engineering measure in the preven...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02B7/02E02B1/00
Inventor 游勇赵彦波柳金峰林雪平刘曙亮
Owner INST OF MOUNTAIN HAZARDS & ENVIRONMENT CHINESE ACADEMY OF SCI
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