SU855115A1 - Antifiltration system - Google Patents

Description

(54) ANTI-FILTER SYSTEM

one

The invention relates to anti-filtration systems and can be used to prevent the influx of water into clean water bodies from closely located polluted water bodies, as well as to protect the groundwater of the area adjacent to the polluted water body.

Anti-filtrating devices are known in the body of a dam or dam, made in the form of an injection curtain, reinforced by a hydraulic barrier, made in the form of wells, somewhat entering the water bed.

The hydraulic barrier, which guarantees absolute watertightness of the entire system, is created in this case either by increasing the pressure by pumping water into the wells, or by lowering the pressure by pumping water in quantities that depend on the required hydraulic potential 1.

However, the creation of an injection curtain and its reinforcement with a hydraulic barrier with a greater potential than in a polluted reservoir is achieved due to the continuous operation of the pumping system, which leads to significant labor and material

costs, high power consumption.

Closest to the proposed technical essence and the achieved effect is an impervious filtering system, including enclosing contaminated

The 5 dam reservoir, located in its body as a hydroshield in the form of a trench, buried to the water stop, with a constantly maintained water level in it above the water level of the polluted reservoir. Protection against filtration of polluted waters is carried out in such systems by creating a pressure zone in the path of water movement in the soil of the dam 2.

However, the device of the trench, brought to the waterproof layer, complicates the technology

5 and the amount of work requires large material costs.

The purpose of the invention is to simplify the work technology and, consequently, reduce the cost of construction while ensuring the protection of the adjacent territory from

20 contaminants.

The goal is achieved by the fact that the channel bottom is located at a given distance above the impermeable layer, and

the distance from the water level in the canal to the water level in the polluted reservoir is determined from the ratio

PL

H;

t jjf

e

t is the distance from the water level in the river to the water level in the reservoir; H, - excess of the water level in the nutrient channel above the waterproof layer;

H is the excess of the water level in the polluted reservoir above the waterproof layer. N-DifferenceB channel water levels

and polluted water; P, - wetted perimeter of the channel. FIG. 1 shows an anti-filtration system, a cross-section; in fig. 2 - filtration scheme.

The anti-seepage system includes a dam 1 enclosing a polluted reservoir 2. In the body of the dam 1 there is a hydraulics suspended in the form of channel 3 with a wetted perimeter PL. the water level in the polluted reservoir 2 satisfies the empirical relation given above obtained by analyzing the hydraulic canopies on a number of EGDA models for the case of homogeneous soils at the base. the dam. Due to the placement of channel 3 relative to the polluted reservoir 2 and maintaining the water level in it above the water level of the contaminated reservoir by the value H, an elevated pressure zone is created in the channel of the channel 3 vertical or close to her

planes with maximum piezometric pressure of oncoming filtration flows. This ensures that, below the bottom of the channel, the interface of the contaminated (from the reservoir 2) and clean (from the channel 3) seepage flows.

Thus, this system prevents the infiltration of polluted filtered water into the protected area and the recharge of ground water by these polluted waters.

Claims (2)

Invention Formula An impervious system includes a dam enclosing a reservoir located above the waterproof layer with a hydro-curtain in its body in the form of a channel with a constant water level, which, in order to simplify the process, the bottom of the channel is located at a given distance above the waterproof layer, and From the water level in the canal to the water level in the pond is determined from the ratio R. Ng A , i is the distance from the water level in the river to the level in the reservoir; H, is the excess of the water level in the channel above the waterproof layer; Hj-TO, in the pond; H - the difference in water levels in the channel and pond; P, - wetted perimeter of the channel. Sources of information taken into account in the examination 1 "Express information, ser. “Hydropower. VINITI, 1978, No. 48, p. sixteen 2. Japan patent number 45-38034, cl. 88 В 1, 1971 (prototype).