SU908994A1 - Method of constructing counter-filtration curtains - Google Patents

Description

The invention relates to hydraulic engineering, in particular to methods for erecting antifiltration curtains, and can also be used in mountain sourness, which is advantageous in the development of placers.

There is a known method for constructing anti-filtering curtains for earth dams by treating the soil on the wet slope surface with water-soluble powder polymers GI.

However, in the known method, the depth of penetration of the reagent into the soil is small and, if the treatment is uneven, filtration losses of water occur, especially on heavily filtering sand-gravel-pebble soils.

The closest in technical essence to the present invention is a method of erecting impervious curtains by treating the soil with water-soluble, pereiquine polymers using explosive charges 2.

The disadvantage of this method is that the waterproofing of the filter screen is insufficient.

The purpose of the invention is to increase the effectiveness of waterproofing.

This goal is achieved by the fact that, after the ground is treated with polymers, parallel grooves are cut on its surface, and explosive charges are placed over the centers of the said grooves, and they are blown up after the reservoir is filled.

10 In addition, powder polymers can be placed in containers with explosive charges attached to them.

Figure 1 shows the dam, priest

15 river section; in Fig.2 a plot of the surface of the soil with parallel grooves; FIG. 3 shows a dam, a transverse section, the elimination of local filtration losses.

20

The method is carried out in the following way.

The soil on the surface of the downhill slope 1 of the dam and the base 2 of the dam is pretreated with water 25 soluble polymer powder, for example, sodium carboxymethylcellulose lulose 3. The polymer flow rate is set depending on the permeability (porosity) of the soil and the efficiency of the polymer. When using Na-KSC, usually 2-3 kg / m is prescribed, and with increasing porosity of the soil it is increased. To improve the adhesion of the polymer to the soil, the treated surfaces are dried with water. After that, at a height of 0.2–0.6 m, parcel blocks of explosives in waterproofing shells, for example, in polyethylene hoses 4, are installed at a distance of 34 m between them. After flooding the reservoir with water

5 charges are blown up using conventional means without slowing down. In order to reduce the specific consumption of bedrock and increase the efficiency of explosive clogging, the soil previously treated with polymer is loosened by holding parallel grooved grooves 6, in the center of which charges are placed in hoses

4. After the soil has been treated with polymer, the grooved grooves 6 are conducted with a bulldozer or a ripper to a depth of m at a distance between them up to 5 m (along axial lines up to 6-8 m). The hose charge is set at a height of 0.4-0.6 from the bottom of the notch

In order to eliminate local filtration losses in places where the impervious filtering impairs the charge, the explosive in the waterproofing sheath 7 is strengthened from the upper side to the package of polymer powder in the paper package 8 and the float 9, and then it is blown under water 5 above the probable place of the impervious imperfection. curtains 10.

The present invention allows to increase the efficiency of waterproofing on soils with high water permeability and to eliminate the costly work on the construction of curtains based on sand-cement compositions. In addition, it allows you to quickly and effectively eliminate local violations of impervious curtains, which are particularly dangerous for the functioning of the earth dam as a whole. The economic effect of its implementation will be from 50 to 100 thousand rubles. per year for each enterprise.

Claims (2)

1. A method of erecting anti-filtration curtains by treating the soil with water-soluble powders of polymers using explosive charges, characterized in that, in order to increase the efficiency of the waterproofing, after the treatment of the soil with polymers, parallel grooves are cut on its surface, and the explosive charges are placed on , c the centers of these grooves, and blow them up after filling the reservoir. 2. A method according to claim 1, characterized in that the powder polymers are dispersed in containers with explosive charges attached to them. Sources of information taken into account in the examination 1, Mining Journal, 1976, No. 10, p. 12-14. 2. Authors certificate of the USSR 589334, cl. E 02 B 3/10, 1976. / :: - 3r:; AV-v:; -V: -ii--: ,: / - .. Ch: -,. - about 1 --.- about S ..: - :): i) .T- o -.-.---. .-.-- .. in .i - ".- ,. I - .- / -. -. :: .- J.-:, - f- about ,.,,,.- - ..-.. ...-.. , . .. about/ . - y; . about . . //////// ///////one - ABOUT .,about.. Rig. one I 3 Phia.2 w . about r-g. - ..- o. . .. about - 0 .-. -. -. . . ABOUT ABOUT-.,-,//////// )(// Fig.Z