Testing device used for researching soil piping erosion rule in complex stress

Abstract

The invention discloses a testing device used for researching a soil piping erosion rule in a complex stress state. The testing device comprises a base, a confining pressure chamber, an axial pressurizing device, an axial pressurizing rod, a sample, a sample cap, a water inlet pipe, a water outlet pipe, and a heat shrinkable pipe. The testing device is characterized in that the sample cap is provided with a leakage groove and a sample cap water outlet pipeline, and the two ends of the sample cap water outlet pipeline are connected with the outlet of the leakage groove and the water outlet pipe; the water outlet pipe is provided with a water pressure sensor and a measuring device; the water inlet pipe is provided with a water pressure sensor, and one end is disposed on the bottom part of the sample, and the other end is connected with a seepage pressuring device. During the use of the testing device, a deformation rule of soil and a migration rule of particles under the action of the accurate complex stress are acquired, and the piping development process of the soil in the complex stress state under the action of the vertical upward seepage is well researched, and a new angle is provided for the full comprehension of the piping development mechanism.

Description

technical field [0001] The invention relates to the field of geotechnical engineering tests, in particular to a test device for studying soil piping erosion laws under complex stress states. Background technique [0002] In earth-rock dam engineering, soil particles often migrate inside the embankment due to seepage, which eventually leads to seepage damage to the soil and endangers the safety of the dam; at the same time, the soil in the embankment is usually in a complex state under stress. Therefore, it is of great engineering practical value to truly simulate the actual stress state of the soil in embankment foundations and to carry out research on seepage failure of soil under complex stress conditions. The seepage direction of the soil at the lower part of the piping outlet and the downstream side of the curtain is often upward, and the existing test equipment cannot combine the vertical upward seepage flow with the stress state to measure the migration law of soil pa...

AI Technical Summary

Problems solved by technology

The seepage direction of the soil at the lower part of the piping outlet and the downstream side of the curtain is often upward, and the existing test equipment cannot combine the vertical upward seepage flow with the stress state to measure the migration law of soil particles, so as to obtain the erosion mechanism of piping; Some cannot simulate the real stress state of the soil, and some cannot apply vertical upward seepage flow under the condition of considering the stress state

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