Seepage failure simulation test device and construction method of embankment with upper defect

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 simulation test device for seepage failure of a dam containing upper defects and a construction method thereof, belonging to the technical field of reservoir dam protection. Background technique [0002] According to statistics, 80.53% of the broken dams in my country are homogeneous earth dams, and the dam height Less than 30m accounted for 88%, and among them, engineering quality problems, aging and disrepair, and biological damage hidden defects caused earth-rock dam failures accounted for another 40%. For example, the dam of Qinghaigou Reservoir was immersed in the highly permeable layer through the upper and lower reaches of the dam, causing seepage failure and failure; the homogeneous earth dam of Dalugou Reservoir in Sichuan was also 1 / 3 height from the top of the dam due to the sudden rise of reservoir water Because of termite caves, the dams were permeated and destroyed. The hazard of the upper hidden defects is that the...

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 changes in the seepage field of dams; The qualitative test of seepage is difficult to reflect the actual seepage behavior and its evolution and catastrophe process of dams with defects

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