Earth-rock dam breaking overtopping field test method

A field test and earth-rock dam technology, applied in the field of dam break test, can solve problems such as mastery, unfavorable test progress, endangering the lives and property safety of downstream people, etc.

A field test and earth-rock dam technology, applied in the field of dam break test, can solve problems such as mastery, unfavorable test progress, endangering the lives and property safety of downstream people, etc.

CN103147422BActive Publication Date: 2015-04-22NANJING HYDRAULIC RES INST
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  • Earth-rock dam breaking overtopping field test method
  • Earth-rock dam breaking overtopping field test method
  • Earth-rock dam breaking overtopping field test method

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Experimental program
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Effect test

Embodiment 1

[0030] Now it is necessary to carry out the dam collapse test of the flooded top of the earth-rock dam. In the test plan, it is determined that the test dam body 1 has a height of 9m and a storage capacity of 100,000 cubic meters. In the present invention, the field test method for a flooded dam failure comprises the following steps:

[0031] 1. Build the test dam body 1 with soil and rock materials on the dam foundation, determine the dam height of the test dam body 1 to be 9m, and the downstream slope to be 1:2;

[0032] 2. According to the field test conditions, it is determined that the dam building material is a certain kind of cohesive soil. The starting friction flow rate of the material is determined to be 0.09m / s through the starting friction test, and the corresponding required water friction flow rate is 0.54m / s. The test For the shape of dam body 1, see figure 1 , via the dimensionless formula:

[0033] u 2 ...

Embodiment 2

[0040] Now it is necessary to carry out the dam collapse test of the flooded top of the earth-rock dam. In the test plan, it is determined that the test dam body 1 has a height of 8m and a storage capacity of 100,000 cubic meters. In the present invention, the field test method for a flooded dam failure comprises the following steps:

[0041] 1. Build the test dam body 1 with soil and rock materials on the dam foundation, determine the dam height of the test dam body 1 to be 8m, and the downstream slope to be 1:2.5;

[0042] 2. According to the field test conditions, it is determined that the dam building material is a certain kind of cohesive soil. The starting friction flow rate of the material is determined to be 0.078m / s through the starting friction test, and the corresponding required water friction flow rate is 0.47m / s. The test For the shape of dam body 1, see figure 1 , via the dimensionless formula:

[0043] u 2 ...

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Abstract

The invention relates to an earth-rock dam breaking overtopping field test method. Aiming at the condition of cohesive-soil homogeneous dams in China and the technical problem of how to determine the depth and the width of torrent guide grooves forming the overflow dam in the dam breaking overtopping test, the invention provides a new solution and a calculation method of related parameters. The inventor combines a burst mechanism to present: if a dam body is required to be burst in the overflow test, the value of the water flow friction velocity at the position of a half dam height needs to be beyond the six times of the starting friction velocity of damming materials. Thus, in the test, a starting friction velocity test is adopted to determine the starting friction velocity of the damming materials, a dimensionless formula is combined to calculate different friction velocity distributions under the overflowing water depth so as to calculate and determine the minimum depth of the torrent guide grooves, and the width of the torrent guide grooves is determined according to the width-depth ratio. The test method has the advantages of safety, reliability, convenience in implementation and the like and has a higher guidance and practical value for developing more earth-rock dam breaking overtopping tests.

Description

technical field [0001] The invention relates to a dam break test method, in particular to a field test method for an earth-rock dam flood top dam break. Background technique [0002] Reservoir dams bring huge economic and social benefits to human beings, but at the same time there is a risk of collapse. Especially affected by global climate change, extreme weather events in my country have increased significantly, and flood disasters are sudden, abnormal, and unpredictable. The nature is becoming more and more prominent, which poses a huge challenge to the safety of reservoirs and dams. In view of the serious consequences of dam failure, people pay more and more attention to the research on the mechanism of dam failure. In the existing research on the mechanism of dam failure, experiment is a very important means. According to the size of the dam break test model, it is mainly divided into two types: indoor and on-site. Although the field test has the characteristics of high...

Claims

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Application Information

Patent Timeline
22 Apr 2015
Publication
CN103147422B
IPC
E02B1/02
Inventors
李云; 宣国祥