RU1630342C - Method of making frozen massif in dam foundation - Google Patents

Abstract

The invention relates to hydraulic engineering. The purpose of the invention is to increase the operational reliability of the dam and reduce the cost of maintaining the base in a frozen state. The permafrost base 1 includes a continuous under-bed talik 2. The base of the talik 2 is indicated by the upper boundary of the permafrost 3. When the dam 4 is erected, fill the reservoir 5 and carry out an anti-filter curtain 6, Channel in the railroad - :; Ib, f. - Coy 8. Section 9 of the channel in the downstream drained II thunder. 1 ill.

Description

The invention relates to hydraulic engineering, in particular to the construction of dead dams and tailing dams in permafrost areas on watercourses with continuous through-throat taliks.

The purpose of the invention is to increase the operational reliability of the dam and reduce the cost of maintaining the base in a frozen state.

The drawing shows an array along the stream of water along the body and base of the dam, a vertical section.

The method is implemented as follows.

On a permanent permafrost base 1, including a continuous under-bed talik 2, indicated by the upper boundary of permafrost 3 under domestic conditions,

dead frozen oil dam 4 frozen type of local materials. In talik 2, under dam 4, simultaneously with the construction of dam 4 and filling of the reservoir 5, a permafrost anti-filtration curtain b is made. With the creation of a curtain 6, the filtration of water into the under-bed talik 2 from the reservoir 5 is stopped. After the permafrost curtain 6 is completed, the channel in the lower pool 7 is blocked by a waterproof bridge 8 made of local materials with a non-ground anti-filter screen. The distance between the dam 4 and the jumper 8 when designing a particular object is assigned according to the results of forecasts of the temperature regime of the base for the period of operation. Then section 9 of the channel

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In the lower pool 7 between the dam 4 and the jumper 8, they are drained and maintained further in the drained xsoctoHmm, pumping out water as necessary in section 9 as a result of 1 filtration from the lower pool 7 and the precipitation. To keep section 9 in the dried state, the channel 8 is covered with soil with a surface underflow system. Next, the under-bed talik 2 under the drained section of the channel 9 is frozen with natural cold. Freezing of the talik 2 is carried out during the operation of the structure. Over time, the upper limit of permafrost

 takes position 10, the under-bed talik 2 under the dam 4 and the channel section 9 in the downstream 7 is completely frozen out, and a monolithic mass of frozen ground is formed at the base of the dam.

The proposed method of creating a frozen massif at the dam base allows to exclude thawing of the base soil in the downstream directly

beneath the dam, to freeze the under-bed talik, to form a monolithic frozen mass of soil at the base, spreading towards the downstream, which will significantly increase the reliability of the dam base in operation.

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Claims (1)

The claims A method of creating a frozen m-bulk at the base of a dam, comprising making a permafrost antifiltration curtain in a talik under a dam, characterized in that, in order to increase the operational reliability of the dam and reduce the cost of maintaining the base in a frozen state, the channel is blocked after the curtain is made in the downstream of the dam with a waterproof jumper, drain the section of the channel between the dam and the bridge, maintain it in a dried state and freeze the talik under this section by feeding naturally cold during operation of the facility. 5. s z g y // //  /// 7 / / 7 / ГЯ / 7 / ГЯ7Г /// 77 ±; -. -t -.:. tshz