SU1724786A1 - Device for determining filtration components in compacted earth embankments - Google Patents

Abstract

FIELD OF THE INVENTION The invention relates to hydraulic engineering. The purpose of the invention is to increase the accuracy and reliability of research by dividing the filtration flow into vertical and horizontal components, ensuring the possibility of conducting full-scale studies year-round, while reducing the time required for their implementation. The embankment to be investigated is divided into the lower 1, upper 2 parts and the embankment 3. In the dirt embankment 3 a feeding pipe 4c is placed with a pressure cavity 5. The pressure cavity 5 is limited with a clay lock with polyethylene film 6. The ring drainage gallery 7 receives filtering

Description

along the layers of the mound of water. Gallery 7 is placed in the top 2 part of the mound. In the lower 1 part of the embankment arrange underground observation gallery 8. On the top and sides of the gallery 8 place the intake tray

9. Tray 9 is filled with rubble. Tray 9 receives water filtered across the layers of the mound. In the upper part of the gallery 8, hatches 10 are arranged for sampling of the soil. 2 Il.

The invention relates to hydraulic construction and is intended to be carried out both in the design process and in the construction process of longitudinal and transverse filtration studies in rafts constructed by embankments, dams, water-dams, industrial sites, for the development of technology for their construction and configuration refinement.

The purpose of the invention is to increase the accuracy and reliability of research by dividing the filtration flow into vertical and horizontal components, ensuring the possibility of conducting field studies year-round while reducing the time frame for their implementation.

Figure 1 shows a diagram of the proposed device; figure 2 - node I in figure 1.

The lower 1 and upper 2 parts of the embankment are used to place the device. Inside the embankment-loading 3, a feeding tube 4 is placed with a pressure cavity 5, bounded by a clay lock with plastic wrap 6. A ring drainage gallery 7 is located in the upper part 2 of the embankment. An underground observation gallery 8 is arranged in the lower part of the embankment. A water intake tray 9 is located coaxially with the pressure cavity 5. In the upper part of the gallery 8, hatches 10 are arranged for soil sampling. Water intake tray 9 provide the outlet pipes 11 with drain sleeves 12.

The device works as follows.

After working out the technology of laying the ground and erecting the lower part of the embankment, the upper part 2 of the embankment is erected according to the already developed technology, designed to test for permeability and filtration strength along and across the laid layers.

A feed tube 4 with a pressure cavity 5, bounded by a clay lock with polyethylene film 6, is placed in a holding embankment load 3, which ensures the retention of the created head, after which it is fed into the feed tube 4

water to accelerate the water saturation of the soil to be tested.

Upon reaching the full moisture content over the entire cross section, there comes a moment of the start of water filtration in horizontal and vertical directions under the influence of the head created in the pressure cavity 5.

Filtering horizontally along the layers of the embankment, the water is received by the annular drainage gallery 7.

In the upper 2 part of the embankment, the annular drainage gallery 7 provides for the intake of water, which is filtered along the laid layers of soil throughout the entire filtration plane.

A device in the lower part of the embankment of the underground observation gallery 8 with a water intake tray 9 located along the top and sides of the said gallery receives and measures the flow of water filtered across the embankment layers.

The water that is filtered in the vertical direction is taken in by means of a water receiving tray 9 filled with rubble, from which it flows down through the drain sleeves 12 of the discharge pipes 11.

The possibility of separating the total filtration flow rate into vertical and horizontal components, separate water intake, filtering along and across the laid embankment layers, increase the accuracy and reliability of measurements.

The execution of manholes 10 in the upper part of the observation gallery 8 allows the sampling of soil to be established in order to establish its filtration-suffixing strength in the body of the test embankment, which also provides an increase in the measurement accuracy.

Performing studies of the vertical and horizontal components of the filtration flow in the deeper layers of the embankment, which do not freeze in winter, allows the work to be carried out around the clock, and not only in the warm season, significantly reducing the time needed for research.

In the process of testing, the instant of the beginning of wetting and full water saturation of the soil is recorded, the time of establishment

water pressure in the feed tube and pressure cavity.

The filtration coefficient of clay soil compacted in the embankment is determined by the radially measured flow rates or by the dependence.

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F (Tf -T „as) I

where Tf - the start time of the filter;

Tnas - the time of establishing the pressure of water in the feed tube and the pressure cavity;

I - pressure gradient;

3nas - the thickness of the embankment. .

Studies using the proposed device can be carried out both to determine the permeability and filtration strength of soils, and to develop and improve the technology of erection of structures and refinement of structures year-round in the design and construction process.

Claims (1)

Invention Formula A device for determining the filtration components in compacted groundwater. 0 five 0 embankments, which include a pressure cavity with a feeding pipe, located respectively within the lower and upper parts of the embankment, an underground embankment load, and an annular drainage gallery, characterized in that, in order to improve the accuracy and reliability of studies by dividing the filtration flow into a vertical and horizontal components, providing the possibility of conducting full-scale studies year-round, while reducing the time required for their implementation, annular drainage gallery for receiving water, filtering along the laid layers of the embankment, placed in the upper part of the embankment. and in the lower part of the embankment an underground observation gallery is arranged, on the top and sides of which a water intake tray is placed coaxially with the pressure cavity to receive water filtered across the embankment layers hatches are arranged.