Earth and rockfill dam piping burst field test method

Abstract

The invention relates to an earth and rockfill dam piping burst process field test method. According to the method, a weak layer is preset in a dam body, a porous pipe is buried in the weak layer to form a piping channel, and the dam is facilitated to form piping burst. According to the method, the phenomenon that a stable seepage channel cannot be formed in the dam and the piping burst cannot be formed is effectively avoided during test, and the phenomena that the field test fails even an unexpected sudden dam break event occurs and losses of life and property are caused because the piping channel formation time cannot be controlled are avoided. The test success rate is improved, and complete test data is ensured. According to the related method, the field piping test development time can be controlled, and the method has important values for improving the large-scale field piping test success rate and mastering the earth and rockfill dam piping burst mechanism and has important significance for pushing the development of the domestic dam break hydraulics discipline.

Description

technical field [0001] The invention relates to an on-site test method for earth-rock dam piping collapse and belongs to the field of water conservancy engineering scientific experiments. Background technique [0002] my country has built more than 88,000 reservoir dams and more than 6.4 million small ponds and dams, of which more than 90% are earth-rock dams. These reservoirs have been built for a long time, many of which were built by local farmers themselves. The hydrological series is short, and the flood control storage capacity and flood discharge capacity of the reservoirs are underestimated. The design and construction standards of many reservoirs are low. Once a dam failure occurs, it will bring serious damage to the downstream. disaster. According to statistics, the proportion of piping failure in earth-rock dam failure events is as high as 29%, which is one of the main reasons for earth-rock dam failure. [0003] However, because the piping failure process of ea...

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Problems solved by technology

[0003] However, due to the complex processes of internal erosion of piping channels and collapse of internal channels during the piping collapse process of earth-rock dams, the collapse process is strongly nonlinear and non-constant, so it is still very difficult to predict the piping collapse process so far.

For dams constructed of non-viscous materials, the governing equations for the transport of non-viscous sediments are not applicable to the internal scour of the piping due to the rapid flow of the dam break

As for the dam body constructed of cohesive materials, because the theory of cohesive soil and sediment transport is not yet mature, it is difficult to obtain a reasonable pipe burst process with the current physical scale model

In other words, most of the indoor tests carried out so far cannot solve the scale problem well, and the results of indoor piping dam failure tests are more qualitative rather than quantitative.

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