Earth and rockfill dam piping burst field test method

A field test and earth-rock dam technology, applied to dams, barrages, hydraulic models, etc., can solve problems such as the difficult pipeline collapse process, the immature theory of cohesive soil and sediment migration, and the inapplicability of non-cohesive sediment pipelines, etc., to achieve The effect of ensuring completeness and improving the success rate of the test

CN103114553BActive Publication Date: 2015-02-04NANJING HYDRAULIC RES INST
7 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2015-02-04

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

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.
Need to check novelty before this filing date? Find Prior Art

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...

Examples

Embodiment 1

[0026] according to figure 1 , 2 As shown in and 3, the dam crest elevation in this embodiment is 8.0m, the piping channel is located 1m away from the dam foundation, and the water level above the dam is 7.6m.

[0027] It is planned to carry out the on-site piping dam failure test. In order to ensure the smooth implementation of the test, a weak layer 2 mainly composed of sand is laid in the dam body 1 at a position 1m high from the dam foundation (of course, other materials that are easy to be lost under the action of water flow can also be used to lay the weak layer). The depth of 2 is 0.6m, the width is 1.5m, and the sand is fine sand with a fineness modulus of 2.2-1.6.

[0028] In the weak layer 2, a water pipe 3 with a diameter of 30 cm is buried, and the water pipe 3 runs through the dam body 1 along the upstream and downstream directions of the dam body 1.

[0029] like Figure 4 As shown, the body of the water pipe 3 is provided with through holes 6 spaced along it...

Embodiment 2

[0034] according to figure 1 , 2 As shown in and 3, the dam crest elevation in this embodiment is 8.0m, the piping channel is located 1m away from the dam foundation, and the water level above the dam is 7.6m.

[0035] It is planned to carry out the on-site piping dam failure test. In order to ensure the smooth implementation of the test, a weak layer 2 mainly composed of sand is laid in the dam body 1 at a position 1m high from the dam foundation (of course, other materials that are easy to be lost under the action of water flow can also be used to lay the weak layer). The depth of 2 is 0.6m, the width is 1.5m, and the sand is fine sand with a fineness modulus of 2.2-1.6.

[0036] In the weak layer 2, a water pipe 3 with a diameter of 20 cm is buried, and the water pipe 3 runs through the dam body 1 along the upstream and downstream directions of the dam body 1.

[0037] like Figure 4 As shown, the body of the water pipe 3 is provided with through holes 6 spaced along it...