Periodic returning seepage experiment device and method

Abstract

The invention provides a periodic returning seepage experiment device and a periodic returning seepage experiment method. The device comprises a first GDS controller, a second GDS controller and a pressure chamber used for storing a soil sample, wherein a top cover is connected with the upper end of the pressure chamber; a piece of filter paper is arranged between the soil sample and the top cover; a pressure-bearing platform is connected with the lower end of the pressure chamber; an upper connecting pipe is arranged on the top cover; a through hole is formed in the pressure-bearing platform; the diameter of the through hole is smaller than the diameter of an inner wall of the pressure chamber; a flow guide chamber is connected with the lower end of the pressure-bearing platform; a lower connecting pipe is connected with an outlet of the flow guide chamber; a first guide pipe is connected with the lower connecting pipe; the upper connecting pipe is connected with the first GDS controller through a guide pipe; the first guide pipe is connected with the second GDS controller; a first valve is arranged on the upper connecting pipe; a second valve is connected with the first guide pipe. The device is used for simulating the soil seepage on the bank slope of a reservoir when the water level rises and falls through a returning seepage test. A measuring cylinder is arranged for collecting the lost fine particles, so that the loss condition of the soil grains in the test can be conveniently known and the soil grains can be taken out and measured. A dial indicator is arranged for monitoring the settlement deformation of a soil sample in a periodic returning seepage process in real time.

Description

technical field [0001] The invention belongs to the field of geotechnical engineering tests, in particular to a periodic back-and-forth seepage test device and method. Background technique [0002] In order to play the role of flood control and power generation of the hydropower station, the water level of the reservoir will fluctuate repeatedly between high water level and low water level. For example, the water level of the Three Gorges reservoir area runs between 145m and 175m all year round. Before the flood season every year, when the water level of the reservoir drops rapidly, the pore water in the slope flows outward, and the movable fine particles in the gravel slope will be lost with the pore water; after the flood season, the reservoir starts to store water to increase the power generation efficiency, At this time, the reservoir water flows into the bank slope. With the periodic fluctuation of the water level of the reservoir, the repeated infiltration of water in...

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Problems solved by technology

At present, there have been studies using field tests and indoor model tests to simulate the influence of seepage force on slope stability. However, the device and method for the impact of periodic back-and-forth infiltration of water in the slope on the loss of fine particles of soil and the internal structure of the slope have not yet been studied. Did not see related reports

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