Testing device for simulating seepage failure of dam with upper part defects and construction method thereof

A technique for simulating tests and constructing methods, applied in hydraulic models, etc., can solve problems such as difficult to reflect the evolution of seepage behavior, catastrophe process, and imbalance of dams with defects

Active Publication Date: 2017-02-01
NANJING HYDRAULIC RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally speaking, the concentrated seepage induced by hidden danger defects shows the effect of unbalanced dominant flow, which in turn causes significant spatio-temporal change

Method used

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  • Testing device for simulating seepage failure of dam with upper part defects and construction method thereof
  • Testing device for simulating seepage failure of dam with upper part defects and construction method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0025] This embodiment relates to the seepage failure simulation test device for dams with upper defects, such as figure 1 with figure 2 As shown, the device includes a model tank 1 made of transparent plexiglass and a dam model 12 arranged in the model tank 1 and made of a clay layer. The dam model 12 is scaled down with the dam to be simulated; the dam model 12 includes sequentially The connected warehouse plate AB, upstream dam slope BC, dam crest CD and downstream dam slope DE, the upper part of the dam model 12 is provided with a simulated ant tunnel 6 that runs through the dam upstream dam slope CD and downstream dam slope DE, and the dam model 12 is provided with a surrounding The weak area 7 of the simulated ant tunnel 6, the clay layer of the weak area 7 is looser closer to the simulated ant tunnel 6; the section of the simulated ant tunnel 6 is arched; the embankment model 12 is located near the simulated ant tunnel 6 at the downstream dam slope DE A spherical area...

Embodiment 2

[0041] This example is the construction method of the dam seepage failure simulation test device with upper defects in Example 1. First, clay is made into a soil sample, and the soil sample is used to fill the foundation of the dam model in a model tank made of transparent plexiglass. and the bottom after tamping, bury a thin tube with an arched cross-section at the preset position on the upper part of the embankment model, the diameter of which is less than 10 cm, and the bottom width is less than 8 cm; continue to fill the soil sample until it is higher than the predetermined height of the thin tube, then tamp it, and then dig Remove the soil samples around the thin tube, expand the excavated area near the downstream dam slope to make the excavated area a spherical area, and refill the excavated soil samples, but reduce the number of times of compaction so that the closer the clay layer in the spherical area is to the thin tube, the more After loosening, continue to fill the ...

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Abstract

The invention relates to a testing device for simulating a seepage failure of a dam with upper part defects and a construction method thereof. The testing device comprises a model tank and a dam model arranged in the model tank. An arch simulative ant channel is formed in the upper part of the dam model. A spherical area is arranged near the position, close to the downstream dam slope, of the simulative ant channel of the dam model, and an artificial sprinkler is arranged above the model tank. A plurality of sets of monitoring sensors are buried near the simulative ant channel in the dam model. The construction method of the testing device comprises the steps that firstly, clay is made into a soil sample, an arch thin pipe is buried on the upper part of the dam model, and tamping is conducted after the soil sample is made higher than the thin pipe through filling; and secondly, the portion, on the periphery of the thin pipe, of the soil sample is excavated to be spherical, the excavated portion of the soil sample is backfilled again to make a clay layer in the spherical area become looser towards the thin pipe, the simulative ant channel is generated by pulling out the pre-buried thin pipe after filling is completed, and the multiple sets of monitoring sensors are arranged along the simulative ant channel. The testing device can be used for studying preferential flow effects of the upper part defects of the homogeneous dam and the disaster-causing mechanism inducing the seepage failure of the homogeneous dam.

Description

technical field [0001] The invention relates to a dam seepage failure simulation test device and a construction method thereof, belonging to the technical field of reservoir dam protection. Background technique [0002] According to statistics, 80.53% of the failed dams in my country are homogeneous earth dams, and 88% of the dams are less than 30m in height, and 40% of them are caused by engineering quality problems, aging and disrepair, and hidden dangers of biological damage. For example, the dam of Qinghaigou Reservoir broke due to reservoir water immersing into the extremely strong permeable layer connecting the upper and lower parts of the dam, causing seepage damage and bursting; The dam collapsed due to seepage damage caused by termite caves. The danger of the hidden danger defect in the upper part is that it is not easy to be detected by daily inspection and instrument monitoring, but its existence opens up a channel for the infiltration of reservoir water under th...

Claims

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Application Information

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IPC IPC(8): E02B1/02
CPCE02B1/02
Inventor 胡江马福恒李子阳霍吉祥叶伟成荣亮周海啸
Owner NANJING HYDRAULIC RES INST
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