Method for measuring and calculating characteristics of breach of landslide and debris-flow dam and application thereof
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A technology for debris flow and dam failure, which is applied in dams, barrages, water conservancy projects, etc., and can solve the problems of difficult application of formulas, limited practicability of formulas, and unseen problems.
Inactive Publication Date: 2011-07-06
INST OF MOUNTAIN HAZARDS & ENVIRONMENT CHINESE ACADEMY OF SCI
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Among the given K value coefficients, the materials that are mainly suitable for artificial earth-rock dams cannot be used as the coefficient K value of the natural accumulation of landslide debris flow dams, and the formula is difficult to apply; third, even the existing coefficient K value, Since the K values of the
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Embodiment 1
[0031] Such as Figure 1 ~ Figure 3 Shown, measure and calculate Sichuan Province Wenchuan County Ginkgo Pinggou debris flow dam breach average width b with the inventive method c value with residual high H d value.
[0032] Ginkgo Pinggou in Wenchuan County, Sichuan Province is located near the epicenter of the 5.12 Wenchuan Earthquake, and there are abundant loose solid materials in the trench due to the impact of the earthquake. At 3 o'clock in the morning on August 14, 2010, a large-scale debris flow broke out under the stimulation of heavy rain, and blocked the Minjiang River to form a debris flow dam.
[0033] (1) Field data acquisition
[0034] On the basis of careful field investigation of Ginkgo Pinggou, 6 factors affecting landslide and debris flow dams are determined through field measurements, that is, the 6 basic data of the dam body and the barrier lake are:
[0035] Dam height H=12m, effective dam length B=117m, internal friction coefficient of materials aro...
Embodiment 2
[0046] Measure and calculate the average width b of the Shiping landslide dam breach in Mao County, Sichuan Province with the method of the present invention c value and residual high H d value.
[0047] Maoxian County, Sichuan Province is located in the upper reaches of the Minjiang River. The Shiping ancient landslide in Nanxin Town in the area has obvious deformation, and cracks appear on the front edge and the back side. Especially affected by the 5.12 Wenchuan Earthquake, the cracks in the slope body were significantly widened, lengthened and increased, and large-scale landslides may occur again, and the Minjiang River will be blocked to form a barrier lake.
[0048] (1) Field data acquisition
[0049] The investigation and measurement were completed at the site of the ancient landslide. According to the exploration data of the slope body and the measurement of the front Minjiang River valley, it is expected to estimate the landslide dam height H = 60m, effective dam le...
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Abstract
The invention discloses a method for measuring and calculating characteristics of breaches of a landslide and debris-flow dam. Aiming at overcoming the deficiencies of the prior art that the method for measuring and calculating the average widths of the breaches of the landslide and debris-flow dam is not appropriate, and the residual heights of the breaches cannot be measured and calculated, the invention provides a method for measuring and calculating the average widths and residual heights of the breaches of the landslide and debris-flow dam and the application thereof. The method for measuring and calculating the breaches of the landslide and debris-flow dam comprises the steps of: firstly obtaining basic data required in measurement and calculation through field investigation and measurement or sampling analysis, and then respectively calculating two characteristic values such as the average width and the residual height of each breach according to corresponding formulas. Based on the breakup mechanism and characteristics of the landslide and debris-flow dam, the method disclosed by the invention pertinently solves the problem of measurement and calculation of the characteristics of breaches of the landslide and debris-flow dam, and realizes the measurement and calculation of characteristic values of the residual height of the breaches for the first time. Through comparison of the measurement value and the practically measured value, the errors of the calculated results are not big, thus the engineering practice demands can be met. The method disclosed by the invention can be applied to measurement and calculation of characteristics of breaches possibly caused before or after the landslide and debris-flow dam is formed.
Description
technical field [0001] The invention relates to a method for measuring and calculating the characteristics of a landslide debris flow dam breach, in particular to a method for measuring and calculating the average width and residual height of a landslide debris flow dam breach and an application thereof, belonging to the field of hydraulic engineering. Background technique [0002] Landslide debris flow dam is a general term for landslide dams or debris flow dams formed by large-scale or large-scale landslides in mountainous areas, debris flows blocking rivers or channels, and the height ranges from a few meters to hundreds of meters. The upstream water forms a dam Lakes vary in volume from thousands of cubic meters to billions of cubic meters. Once the dam body breaks, a large amount of lake water will be released rapidly through the breach, often forming super floods with extremely large flow rates, causing severe disasters downstream. Especially after a major earthquake,...
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IPC IPC(8): E02B1/00E02B7/06
Inventor 程尊兰吴积善刘建康时亮
Owner INST OF MOUNTAIN HAZARDS & ENVIRONMENT CHINESE ACADEMY OF SCI
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