SU1583521A1 - Stone and earth-fill dam - Google Patents

Abstract

The invention relates to the field of hydraulic engineering. The purpose of the invention is to simplify the construction and technology of the construction of the dam in a harsh climate and increase its reliability during operation. The stone-to-earth dam contains bottom 1 and top 2 prisms from the stone outline, a ridge, transition zones 6 and an anti-filtration device 3 with an anti-multipass head 4. The tip 4 is placed above the mark of the normal retaining level at a distance equal to the building stock per draft, and performed are from poorly lumpy, non-filtering frozen soil, maintained in a permafrost state during operation. Layers of heaving soils are laid over the frozen tip. The cap 4 can be made of a material that has a defrosting coefficient of at least 9 .10 -3 cm / s, of coarse-grained soils with an amount of 35-50% by mass, which have been artificially sealed before freezing. Coarse sands or sand-gravel mixtures compacted before freezing to the skeleton density of fine-earth, equal to 1.60 - 2.20 t / m 3, can be used as thermal insulation from a non-refined soil. f-ly, 1 ill.

Description

The invention relates to hydraulic engineering construction and can be used in the construction of earthen dams in the northern construction and climate zone,

The purpose of the invention is to simplify the construction and technology of the construction of the dam in a harsh climate and increase its reliability during operation.

The drawing shows the dam section.

The dam includes downstream 1 and upstream 2 prisms from rock outlines, an impervious device 3 from bonded soils, 4 tips from weakly lumpy soils with frozen zone 5 within the normal retaining level (NPU) and forced retaining level (FPU), on the sides of the impervious filter 3, transition zones 6 of the body of the dam are placed. Within the base 7, an anti-seepage curtain 8 is made, above which the lost 9 is placed for grouting. The gravel material 10 and the ridge 11 are also indicated in the drawing.

The construction of the dam is carried out as follows.

If necessary, the ground 9 is erected for grouting, then the bottom 1 and the top 2 prisms from the rough bed, as well as transition zones 6 and the impervious device 3 from the bond ground are poured in layers. The latter is rolled to the required density, providing a filtration coefficient of not more than A 10 HiM / c o All structural elements are raised to the elevations of the normal retaining level, taking into account the margin on the construction draft, while at the same time the impervious curtain 8 at the base 7 is executed, then with the negative At atmospheric temperatures, lay-by-step dumping of thawed weakly earthening soil, for example coarse-grained, with sandy-clay aggregate in an amount of 35-50 wt0% with optimum humidity followed by rolling to a density of, eg, 1.60-2.20 t / m is performed. about

baking the filtration coefficient is not more than 9 -1СГ3 cm / s and the subsequent natural freezing of each layer. At the same time, the dumping of the upper and lower ones continues from 0

five

0

five

.-

0

five

0

marks NPU-FPU0 The erection of the tip 4 according to this technology is carried out to the marks of the formed retaining level taking into account the draft of the draft. The thus formed area of frozen soils is covered with a layer of 10 of a gravel material, which is also a roadbed and forms the crest 11 of the dam. The thickness of layer 10 is chosen in such a way as to prevent thawing of the construction head 4 at the time of the peak of the extreme flood below the levels of the retaining level formed.

When filling the reservoir to the levels of the normal retaining level and the subsequent operation of the construction, the filtration resistance of the dam is ensured due to low values of the filtration coefficient of the filtering device from connected soils. When the reservoir level rises to the levels of forced retaining level, the filtration resistance of the structure is ensured due to the water resistant properties of the frozen slightly obscure soil of the tip. During catastrophic floods and long-term standing of the reservoir level at the elevated forced retaining levels, the frost-free head condition provides a seasonal cooling device installed on the dam crest to the normal retaining level marks. If necessary, the heads are equipped with a solar cooling device mounted on the crest to marks NHE.

Claims (1)

Invention Formula 10 Stone-to-earth dam, including downstream and uplite prisms of rock-sketching, a ridge, transition zones and an anti-filtration device with a counterchipping head, characterized in that, in order to simplify the construction and technology of erection of the dam in a harsh climate and increase its reliability during operation, the bottom of the tip is made of weakly erupting frozen soil unburied at the normal retaining level of the reservoir, taking into account the reserve for the settlement of the soil of the dam body, and on top of the frozen 5 158352 the cap is laid layers of nepuchins-made of frozen coarse soil primers with a sandy-clay filling 2. The dam of p I, about t l and h a-tele in the amount of 35-50 You need a head that you have - 4 The dam according to p. I - 3, about t l and - is made of a material with a coefficient that does not tamper-filtering at least 9-10 3 cm / s from the ground consists of the frozen size of the supine state, granular sands or sand and gravel3, Dam according to claims I and 2, different mixtures with skeleton density is shallow so that the cap of the goat is 1.60 - 2.20