SU1535929A1 - Method of constructing an earth dam - Google Patents

Abstract

FIELD OF THE INVENTION The invention relates to hydraulic engineering. The purpose of the invention is to reduce the time required for the formation of the soil filtering element and increase the reliability of the dam. Along the axis of the dam erected from frozen cohesive soils, metal perforated pipes are laid at the base of the structure. Over the pipes, pour the frozen bonded soil to the design height of the dam with simultaneous treatment with saline solution. On the surface of the poured soil along the longitudinal axis of the structure, laid metal electrodes are placed according to the number of laid perforated pipes. The electrodes overlap with a layer of soil whose thickness is 25% of the design height of the dam. Under the influence of heat from the supply of electric current to the pipes and electrodes, a thawed anti-filtration element in the form of a core is created. Then a constant voltage is applied to the pipes and electrodes. In this case, the tubes serve as the cathode, and the electrodes as the anode. Under the influence of electroosmosis, a rapid outflow of water from the dam body occurs. 2 Il.

Description

The invention relates to hydraulic construction, in particular, in the construction of earth dams, mainly in the northern climatic zone.

The purpose of the invention is to reduce the time required for the formation of the soil filtration element and increase the reliability of the dam.

FIG. Figure 1 shows the layout of the perforated metal pipes, the extended electrodes and the direction of the outflow of water; in fig. 2 is a section through the dam A-A in FIG. 1 and an electrode connection circuit.

Perforated metal pipes 2 are laid on the base 1 along the axis of the dam. The collector 3 collects 3 and removes water from it. Pipe A is used to dump frozen cohesive soil 5 at the design height of the structure N. , NaCl) on the surface of the poured soil layer, also along the dam axis, extended metal electrodes 7 are placed, after which the top soil layer 8 is poured, whose thickness is equal to the depth of the seSP

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zonal freezing in the area. The pipes 2 and electrodes 7 are connected to a source of alternating electric current 9. The soil of the central part of the dam treated with saline is heated with an alternating electric current to a positive temperature, then these electrodes are connected to a direct current source 10, while the pipes 2 serve as cathode, the anode.

Claims (1)

Under the influence of electroosmosis and preload on the weight of the overlying stratum, water flows through perforations in pipe 2 into collector 3, from which it is pumped out by pumps. The treatment of soil by a constant electric current is stopped after a sharp drop in the voltage in the electrical circuit, due to a decrease in the moisture content of the soil being processed. Invention Formula The method of erection of a soil dam, including dumping. 0 soil, followed by thawing, characterized in that, in order to reduce the time required for the formation of the soil filtering element and increase the reliability of the dam in operation, metal perforated pipes are placed at its base along the axis of the erected structure the height of the dam with simultaneous treatment with saline solution on the surface of the poured soil, along the longitudinal axis of the structure above each of the laid pipes have extended met llicheskie electrodes overlapping the next layer of soil, the power of which is 25% of the design height of the dam, and then by exposing the AC and DC electrical current creates thawed impervious element as others. V .8 4 S / fig1 ± ma fig 2