Earth and rockfill dam for simulating piping dam break test

Abstract

The invention relates to an earth and rockfill dam for simulating a piping dam break test. The earth and rockfill dam comprises a dam body which is built by rock materials, wherein a weak layer capable of generating a piping channel is laid at a set position of the dam body according to the test requirement; a water pipe which penetrates through the dam body is arranged in the weak layer; through holes which are distributed along the axial direction at intervals are formed in a pipe wall of the water pipe; and the water pipe which is positioned at the upstream end of the dam body is provided with a valve. During test, water is injected into the water pipe so as to wash the weak layer, so that the formation of piping channel inside the dam body is simulated and accelerated. The field piping test development time can be controlled, 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.

Description

technical field [0001] The invention relates to an earth-rock dam, in particular to an earth-rock dam used in a simulated piping dam break test. 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 earth-rock dams is accompanied by complex pro...

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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 flushing of pipes because the dam-breaking water flow is mostly unsteady rapid flow

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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