Biggest superelevation calculation method for debris flow curve and application
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A calculation method and debris flow technology, applied in water conservancy projects, water conservancy engineering equipment, buildings, etc., can solve the problems of poor universality and achieve the effects of preventing casualties and property losses, high applicability and universality of disaster prevention
Active Publication Date: 2017-10-24
CHENGDU UNIVERSITY OF TECHNOLOGY
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[0008] The superelevation calculation method of the debris flow curve disclosed in this patent document follows the principle of dimensional harmony, and the obtained superelevation value of the debris flow curve is relatively accurate, which can provide theoretical data for debris flow defense measures. However, it is only applicable to debris flows with the same nature and curvature The superelevation calculation of debris flow curves with the same radius, and most of the targets are viscous debris flows, with poor universality
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Embodiment 1
[0029] A method for calculating the maximum superelevation of a debris flow curve, comprising the following steps:
[0030] a. Obtain the average flow velocity V of the debris flow at the place where the debris flow occurs, in m / s;
[0031] b. On-site measurement of the width B of the debris flow channel at the place where the debris flow occurs, in m;
[0032] c. On-site measurement of the radius of curvature R of the center of the debris flow curve, in m;
[0033] d. Measure and calculate the yield stress τ of debris flow, unit Pa;
[0034] e. Measurement and calculation of debris flow density p, unit kg / m 3 ;
[0035] f. Calculate the maximum superelevation value ΔH of the debris flow curve through formula 1, and the unit is m;
[0036]
[0037] In the present invention, "a, obtain the average flow velocity V of the debris flow in the place where the debris flow occurs; b, measure the debris flow channel width B in the place where the debris flow occurs; c, measure t...
Embodiment 2
[0039] A method for calculating the maximum superelevation of a debris flow curve, comprising the following steps:
[0040] a. Obtain the average flow velocity V of the debris flow at the place where the debris flow occurs, in m / s;
[0041] b. On-site measurement of the width B of the debris flow channel at the place where the debris flow occurs, in m;
[0042] c. On-site measurement of the radius of curvature R of the center of the debris flow curve, in m;
[0043] d. Measure and calculate the yield stress τ of debris flow, unit Pa;
[0044] e. Measurement and calculation of debris flow density p, unit kg / m 3 ;
[0045] f. Calculate the maximum superelevation value ΔH of the debris flow curve through formula 1, and the unit is m;
[0046]
[0047] The invention is applicable to the calculation of the maximum superelevation of the curve under the condition of different yield stress debris flows at different speeds at the same curve.
[0048]It can accurately calculate ...
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Abstract
The invention discloses a biggest superelevation calculation method for a debris flow curve and application and belongs to the technical field of debris flow preventing and treating projects. The biggest superelevation calculation method for the debris flow curve is characterized by comprising the following steps that a, the average flow speed V of debris flow at the debris flow occurring place is acquired; b, the channel width B of the debris flow at the debris flow occurring place is measured on site; c, the center curvature radius R of the debris flow curve is measured on site; d, the yielding stress tau of the debris flow is measured and calculated; e, the density Rho of the debris flow is measured and calculated; and f, a biggest superelevation value delta H of the debris flow curve is acquired by means of calculation of formula 1. The biggest superelevation calculation method for the debris flow curve is applicable to actual large-scale calculation on the field, the influences of the nature of the debris flow on the superelevation are considered, superelevation may be produced by the debris flow with different yielding stresses at the same curve position under different speed conditions can be accurately calculated, better theoretical data reference is provided for defensive measures of the debris flow, and higher disaster preventing applicability and universality are achieved for debris flow disaster reducing.
Description
technical field [0001] The invention relates to the technical field of debris flow prevention and control engineering, in particular to a method for calculating the maximum superelevation of a debris flow bend and its application. Background technique [0002] Debris flow is a torrent formed by heavy rain and floods after saturation and dilution of soft soil mountains containing sand and rocks. Its area, volume and flow are large, while landslides are areas of small areas of diluted soil mountains. Typical debris flows are caused by suspended It is composed of viscous mud rich in silt and clay with coarse solid clastics. [0003] Under appropriate terrain conditions, a large amount of water soaks the solid accumulations in the flowing water hillside or ditch bed, reducing its stability, and the water-saturated solid accumulations move under their own gravity, forming a debris flow. Debris flow is a disastrous geological phenomenon. Debris flows usually erupt suddenly and f...
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