SU1469134A1 - Method of working soil on water reservoir bottom - Google Patents

Abstract

The invention relates to the construction and development of sand pits, located under the reservoirs in the regions of the Far North. The goal is to increase the efficiency of the following: working the soils of the talik zone: small reservoirs in permafrost waterproof soils by simplifying the technology of work. To do this, during the period of positive temperatures, the vegetative cover and the peat layer are cut from the coastal part to the depth of its seasonal thawing and transferred to the reservoir. These operations begin from the upper side, where small streams flow into the reservoir, and from the lower side, the prefabricated. efficiently form a drainage trench along the channel of the largest stream. The water is displaced by cut-off morast-concrete cover and peat with the formation of platforms, simultaneous drainage and warming of the soil of the talik zone. Acupuncture installations are placed on the formed sites through which the talicore zone is produced. Soil development is carried out by means of excavation equipment. In advance (up to several days), depending on weather conditions, the insulation is removed from the surface of the quarry in the area of the bottom, avoiding snow and insulation in the face and disturbing the integrity of the insulation in the adjacent areas of the quarry. 3 il. § 4 ;: O); o 00 4;

Description

,one

The invention relates to the construction and relates to the development of sand pits located under water bodies in the regions of the Far North.

The purpose of the invention is to increase the efficiency of the development of soils of the talik zone of small reservoirs in permafrost waterproof soils by simplifying the technology of operations.

FIG. 1 is a plan view of the quarry prepared under the pond; FIG. 2 is a section A-A in FIG. one; in fig. 3 - career development, cross-section.

The method of excavation includes the following operations.

During the period of positive temperatures, using a mechanical means, such as a bulldozer, from the coastal part the mossification cover and the underlying thawed peat layer are cut from the territory of the closed reservoir (lake) of the territory that freezes in winter. The resultant cut-off mixture 2 is transferred to the boom. Moreover, these operations start from the upstream side, where Q small streams 3 flow into the reservoir 1, and from the downstream side pre-form a drainage trench 4 along the channel of the largest creek. Along the contour of the reservoir, in front of the cut-off strip t5 of the soil, upland drainage ditches are being developed. The water is displaced by cut-off morale and vegetation cover and peat, with the formation of platforms, simultaneous drainage of the reservoir and warming of the soil of the high-pressure zone. After the formation of pads from a mixture of 2, the needle filters 5 are immersed, for example, by means of a vibrator or hydrofluid, for the entire depth of the talik zone 6 (its boundary with permafrost 7 is indicated by the position 8). Then the talic drainage is performed; zones b by pumping out water from the needle filters 5 (the depression curve is marked 30 by the position 9). The number of needle filters 5, their locations and pumping modes are determined in advance by known dependencies and rules of hydrogeology, depending on the size of the talik zone, the filtration coefficient of sandy soil for a given drainage time.

Soil development is carried out by means of excavator equipment. When 40 is necessary, the development of the soil can be done after complete drying of the talik zone 6, dismantling the needle filters 5 and another pump

20

25

five

0

five

0

0

five

equipment. The permafrost soils 7 surrounding the thawed zone exclude the ingress of groundwater into the drained thawed zone. Watering it with surface waters from the surrounding area prevents highland drainage ditches. In advance (up to several days), depending on weather conditions, the insulation is removed from the surface of the quarry at section 10, avoiding snow and insulation in the face and disturbing the integrity of the insulation in the adjacent areas of the quarry.

Claims (1)

The invention method of excavation of soil from the bottom of reservoirs, including the drainage and warming of the surface of the developed area during the period of positive temperatures-1F, removal of insulation and the development of soil on the site during the period of negative temperatures, about l and h by the fact that, in order to increase the efficiency of the development of soils of the talik zone of small reservoirs in permafrost water-impermeable soils by simplifying the technology of conducting works during the period of positive temperatures from the coastal part, The flax cover and the peat layer to the depth of its seasonal thawing and transferred to the reservoir, cut off the water by cutting vegetation cover and peat, with the formation of sites, simultaneous drainage of the reservoir and the warming of the soil of the talik zone, needle filters are placed at the formed sites. These zones are being developed by means of excavation equipment. te.f 7 S. X. T C tW, if v v .- 2 1p | 1 | 1 | 1) 1 | MCh 1TS111 | “1Ч1 | 11 | 1H 1 1 | 1 1 | one 7  X. T C tW, if v v -p-jrv .. "Gz