Calculation method for impact height of viscous mud-rock flow on slit damp
A calculation method and technology for debris flow, applied in height/level measurement, measurement devices, instruments, etc., can solve problems such as the influence of comb dams that are not specifically considered, and achieve the effects of reliable method principle, simple calculation process and high accuracy of calculation results.
Inactive Publication Date: 2019-06-28
INST OF MOUNTAIN HAZARDS & ENVIRONMENT CHINESE ACADEMY OF SCI
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Problems solved by technology
Comb dam, as a common permeable sand dam, has the advantages of simple structure, convenient construction, good water permeability, and both blocking and drainage; the impact height of debris flow is an indispensable parameter in the design of debris flow prevention and control engineering. At present, for viscous The calculation method of the impact height of the debris flow acting on the comb dam just follows the calculation formula of the debris flow impacting the impermeable sand check dam, and does not specifically consider the influence of the geometric parameters of the comb dam and the channel conditions on the impact height of the debris flow
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Embodiment 1
[0042] Such as figure 2 , 3 As shown, a debris flow ditch is located in Lvmao Township, Dongchuan District, Kunming City, Yunnan Province, with a drainage area of about 52.8km 2 , the total length of the main ditch is 21.4km, the relative altitude of the watershed is 2196m, the relative height difference can reach 1032m, the clay content of the debris flow is 11%, the terrain is steep, and the channel is cut seriously; , seriously threatening the lives and properties of local residents.
[0043] Aiming at the debris flow disaster in this area, it is planned to build a comb dam prevention project in the ditch, and the calculation method of the present invention is used to calculate the impact height when the debris flow hits the comb dam, which provides a basis for the design of the comb dam project. The calculation method steps of the impact height of the viscous debris flow impact comb dam are as follows:
[0044] (1) Through field investigation, it is determined that t...
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The invention relates to a calculation method for the impact height of viscous mud-rock flow on a slit damp. Mud-rock flow disaster preventing project prospecting is carried out on a mud-rock flow for engineering prevention and control, under the condition that the mud-rock flow density of the trench is greater than 2000kg / m3, and the flow velocity of the possible mud-rock flow, the mud depth, the trench width, the trench gradient, the opening width of the slit dam and the number of openings are determined; according to basic parameters obtained by field investigation, a froude number of theupstream mud-rock flow of the slit dam and the opening rate of the slit dam are calculated; and according to the froude number of the upstream mud-rock flow of the slit dam and the opening rate of theslit dam, the impact height of viscous mud-rock flow on the slit damp is calculated. According to the method, principles are reliable, the calculation process is scientific and simple, a calculationresult is highly precise, influence of the flow state of the mud-rock flow, geometric parameters of the slit dam and the trench condition on the impact process of the mud-rock flow is taken into integrated consideration, and basis is provided for the mud-rock flow disaster preventing project.
Description
technical field [0001] The invention relates to the technical field of mud-rock flow disaster prevention and control engineering, in particular to a calculation method for the impact height of viscous mud-rock flow acting on a comb dam. Background technique [0002] Debris flow is a common geological disaster, which has the characteristics of suddenness, fast flow, large flow, large material capacity and strong destructive power. When mudslides break out, they often destroy infrastructure such as roads and railways, block rivers and even destroy villages, causing huge loss of life and property. Therefore, it is particularly important to prevent and control debris flow. [0003] Permeable sand check dams are widely used engineering measures in debris flow prevention and control projects. Comb dam, as a common permeable sand dam, has the advantages of simple structure, convenient construction, good water permeability, and both blocking and drainage; the impact height of debr...
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IPC IPC(8): G01C5/00
Inventor 周公旦杜俊翰宋东日
Owner INST OF MOUNTAIN HAZARDS & ENVIRONMENT CHINESE ACADEMY OF SCI