Flow velocity and flow quantity calculating method of debris flow passing through grid-type dam
A technology for flow calculation and debris flow, applied in water conservancy projects, water conservancy engineering equipment, buildings, etc., can solve the problems of unsuitable flow rate and flow calculation of permeable sand check dams, and inability to use permeable sand check dams for calculation, etc.
Active Publication Date: 2018-06-29
INST OF MOUNTAIN HAZARDS & ENVIRONMENT CHINESE ACADEMY OF SCI
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The above two patents are mainly aimed at the flow situation of the solid sand check dam, and are not suitable for the calculation of flow velocity and flow after the permeable sand check dam passes through the dam, and cannot be used for the calculation of the permeable sand check dam in actual engineering
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[0021] For realizing the above object, technical scheme of the present invention is:
[0022] The present invention proposes a kind of mud-rock flow lattice dam crossing dam flow velocity, flow calculation method, the theoretical derivation of described calculation method is as follows: assume that the mud-rock flow bulk density passing through a certain section upstream of the lattice dam is γ a , with velocity v a , the mud depth is h a , the bulk density of debris flow passing through a section downstream of the lattice dam is γ b , with velocity v b , the mud depth is h b In the case of dam, it is assumed that the maximum mud depth of the debris flow is greater than the opening spacing of the lattice dam, ignoring the influence of the debris flow over the dam on the properties of the debris flow downstream of the dam, and deducing the velocity and flow relationship of the debris flow through the lattice dam.
[0023] Such as figure 2 Shown is a schematic diagram of d...
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The invention provides a flow velocity and flow quantity calculating method of debris flow passing through a grid-type dam. The flow velocity and flow quantity calculating method comprises the steps that the volume-weight of the debris flow at the upstream and the downstream of the grid-type dam, the characteristic particle size of the debris flow, the width of a ditch, the opening space of the grid-type dam, the diameters of crossbeams and vertical beams of the grid-type dam and the number of the crossbeams of the grid-type dam are obtained; the flow velocity coefficient and the flow quantitycoefficient are rated through a coefficient rating formula obtained by combining basic parameters obtained through field study with an indoor model test; and the flow velocity and the flow quantity of the debris flow passing through the grid-type dam are calculated. The flow velocity and flow quantity calculating method of the debris flow passing through the grid-type dam has the beneficial effects that the property of the debris flow, dam body parameters and a ditch condition are taken into consideration comprehensively, the velocity coefficients and the flow quantity coefficients under different conditions are rated by combining the indoor model test, and the velocity and flow quantity calculating formulas are obtained through theoretical derivation, so that the basis is provided for application of debris flow prevention and treatment engineering.
Description
technical field [0001] The invention relates to a method for calculating flow velocity and flow rate of a debris flow lattice dam and its application in debris flow prevention and control engineering. Background technique [0002] Debris flow engineering measures are an important means of debris flow prevention and control. Since 2008, strong earthquakes have occurred in Southwest China, the surface rock and soil structure has been greatly damaged, and the source of debris flow has increased. The debris flow presents the characteristics of high frequency, large scale, and long active period. The amount of prevention and control is large and the task is arduous, and more innovative explorations are needed for prevention and control projects. [0003] In recent years, my country has made some progress in the study of permeable sand control dams, and some permeable sand control dams have been gradually built in the Wenchuan earthquake-stricken area, such as window dams, slot da...
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Login to View More IPC IPC(8): E02B1/00
CPCE02B1/00
Inventor 柳金峰袁东游勇周文兵焦亮
Owner INST OF MOUNTAIN HAZARDS & ENVIRONMENT CHINESE ACADEMY OF SCI