Earth-rock dam break centrifugal model test analysis method

Abstract

An earth-rock dam break centrifugal model test analysis method is characterized by comprising the following steps that (1) an earth-rock dam break test special model box is arranged; (2) the working principle and the stress similarity criterion of a centrifugal machine are used, an earth-rock dam prototype and a 1 / N-contraction-scale centrifugal test model are obtained, under the Ng centrifugal acceleration condition, the linear size ratio of the model and the prototype is 1 / N, and the earthing stress of the model and the prototype is the same; (3) according to the seepage similarity criterion, the obtained permeability coefficient of centrifugal model earth is N times of the permeability coefficient of prototype earth; (4) according to the shearing strength similarity criterion, the particle diameter of model cohesiveless earth-rock materials is reduced by N times; and (5) according to the water flow similarity criterion, the similarity criterion of commonly-used physical quantity in an earth-rock dam break centrifugal model test is obtained. The method is not limited or restricted by fields, a large amount of earth and a large number of water resources are of no need during testing, and the method has the advantages of being low in cost and short in time.

Description

technical field [0001] The invention belongs to the technical field of test theory, and in particular relates to an earth-rock dam break centrifugal model test analysis method, which is especially suitable for the experimental research on the break mechanism of the earth-rock dam, the development law of the break and the flow process of the dam break. Background technique [0002] At present, my country has built more than 98,000 reservoir dams and 100,000 kilometers of important embankments, most of which are earth-rock embankments. While these reservoir dams and embankments have brought us huge benefits, they also have the risk of collapse. Since 1954, 3,524 reservoir dams and many embankments have failed in my country, causing major loss of life and property and ecological and environmental disasters. For this reason, in recent years, a large number of experimental studies have been carried out on the dam break mechanism, break development law and dam break flood flow pro...

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Problems solved by technology

However, it is generally difficult to find a suitable test site for this type of test. Even if a suitable test site is found, a large amount of land and water resources will be occupied during the test, which is costly and time-consuming, especially as the dam height increases. risk control will become very difficult

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