SU1458484A1 - Method of erecting hydraulically deposited structure - Google Patents

Abstract

The invention relates to the field of hydraulic engineering. The purpose of the invention is to increase the stability of the structure by ensuring the outflow of residual moisture from the washed-up rus. Before the washout of each river from the pulp outlets 3, made in the slurry lines 2, located on the embankment dams 1, the permeation screen of the frozen type, which prevents water filtration into the structure body from the washed soil, is erected on the entire surface of the wash map 5. Then, in the process of washing in the soil, the screen is gradually thawed due to heat influxes from the outside. After the screen is completely thawed, the soil is washed out, the new screen is frozen and the entire cycle of works is repeated. The thickness of the layers of the screen, freezing, for example, at negative air temperatures, is determined from the condition of its complete thawing by the time of freezing the screen of the next rus. Liquidation of the downstream screen provides a more complete outflow (dispersion) of residual moisture from the already washed layer of soil located under the frozen screen. 8 il. S9

Description

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The invention relates to methods for erecting alluvial structures, in particular protecting fences of the tailing dump.

The purpose of the invention is to improve the stability of the structure by ensuring the outflow of residual moisture from the reclaimed river. FIG. 1-8 is a flowchart of the method.

FIG. Figure 1 shows the phase of completion of the embankment building; in fig. 2 - the phase of the wash of the next layer of soil of the frost-proof anti-seepage screen (PFE) of the first Rus; in fig. 3 — phase of freezing completion to a predetermined thickness of the first PFE; in fig. 4 - a phase of further washing in of the first rus and gradual thawing of its screen; in fig. 5 shows the phase of the completion of the construction of the second river ramp in FIG. 6 --- phase of freezing of the second PFE; in fig. 7 - phase of completion of the Euzvedeni facilities at full height; in fig. 8 - phase of completion of commissioning of the alluvial structure in the form of a dam.

The method is carried out as follows.

In the area designated for the flushing of the structure, for example, tailing sites, the primary embankment dams 1 are dumped and the distribution slurry line 2 is laid on them with pulp outlets 3 (Fig. 1). A water discharge well 4 is arranged in the central part. After the average daily air temperature becomes negative at the beginning of winter, the screening of the impervious screen begins all over the entire surface of the map 5. On the frozen map 5, a 3 layer of soil 6 with thickness Ahi is washed out from pulp-outs (Fig. 2). The thickness of the bed is generally determined experimentally or on the basis of heat engineering calculations, depending on climatic conditions, soil properties, the required rate of increasing the thickness of the screen, etc. But still it should not exceed 10-15 cm. Then pulpups 3 are closed. During the technological break, the washed-in soil layer 6, due to its small thickness, quickly transfers heat to the surrounding atmosphere and completely freezes. Pulp outlets 3 reopen and wash the next layer 7 with a thickness of dB and again wait until it is completely frozen. This process is repeated until the thickness of the frozen screen 8 reaches a predetermined value h, (FIG. 3). The thickness of the screen is usually prescribed with such a condition that with the used technology of the inwash screen 8 is completely otta l to the beginning of the construction of screen 9 (Fig. 6) in the next floor. After the screen freezes, the alluvium is continued according to the usual technology, which, in particular, in winter

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The period provides for the continuous nature of alluvial work (Fig. 4). The frozen screen 8 prevents the infiltration of water from the layer 10 freshly washed onto it from penetrating into the underlying soil layers. Filtration from the freshly washed layer of soil 10 occurs only parallel to the surface of the underlying screen 8 towards the settling pond I, since there is a slope in this direction. When the structure is washed up, the pulp flows on the plate are a source of heat, which partially spreads into the underlying layers of the soil. Under the influence of these heat fluxes, the frozen screen 8 begins to thaw gradually and its thickness h (decreases (Fig. B). With the onset of summer, this process is intensified. During this period, screen 8 thaws not only during the washing process, but also during technological interruptions If the screen was completely thawed before the onset of cold weather, the alluvial work on this section is temporarily stopped (Fig. 5). With the onset of cold weather, the screening of the impervious screen is resumed on the next track, and the entire cycle of work, starting with layer-by-layer of screen freezing 9 (Fig. 6), repeated many times until the completion of erection, rus after brown, of the whole structure to the design height. Thus, during the entire time of the construction of the structure at full height, the anti-filtration screen periodically moves upwards with increasing height of the structure and But it is located near the surface of the map of alluvium, preventing the infiltration of water from the pulp. After thawing of the next impervious screen, the residual moisture contained in the overlying soil layer is dispersed in the body of Due to the free outflow, and the water content of the reclaimed river is significantly reduced. In a structure erected to the design height, no impervious screens remain.

This method can also produce alluvium structures such as dams (Fig. 8).

Example. The alluvium is produced in a tailings storage facility located in an area with a sharply continental climate. The average annual temperature is about 0 ° C. The winter period with negative average daily air temperatures lasts about 6 months. in a year. The weighted average diameter of the washed tailings is 0.36 mm, the consistency of the pulp fed to the alluvium card is 1:10. 500 m. The discharge of pulp from pulp issue with a diameter of 1000 mm with a flow rate of 6000 m. The construction of the SPV in the winter alluvium begins after the soil freezes to a depth of 0.2-0.25 m. up to 0.1 m they make technological breaks in the alluvium for 10-30 hours depending on the air temperature until the layers are completely freezed. Thus, the thickness of the anti-filtration screen is brought to 0.7 m. It takes about 1.5 months to echo. Further, alluvium in this area is carried out continuously and by the end of winter another layer of soil is thickened up to 2 m. Calculations made on a computer show that by this time the screen thaws about 65% of its thickness. After that, in this area alluvium is stopped until the next winter. Over the summer, the frozen screen thaws completely and with the onset of the new winter, work resumes. In other areas of the alluvium screen thickness is chosen different depending on the subsequent heat load on the screen, ZvidLg L / 7

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With the help of technology and terms of reclamation.

Claims (1)

Invention Formula A method for erecting a foreclosure, including the dumping of dykes, the construction of an impervious screen on the surface of the previous river and the alluvial soil washing, characterized in that, in order to increase the stability of the building by ensuring the outflow of residual moisture from the washed river, the impervious screen is erected by layer-by-layer freezing of the washed soil with the subsequent liquidation of the screen by thawing in the process of further washing the Russ, and after complete thawing Vani screen Alluvian Rus stop and freeze the screen subsequent Rusa. (g.2 ./ Faye. eleven           - /// U /////////////////// ///////////////////// Phage 5  f fjf jjjj fj jyyyyy / j j $ fjf ,, ir r -.- - jTYYY. l l 1. D 1 j 1 1 1 I I., / r / rl W: ШШ1; ЩЩр; shZhr  ///// / /// /// /// ig.6 .    - .-., / ч7 -: -, -уiS: - .--;.:;  -. -,  yl - .., f -, Shs. . ....,. - - .- -: .. . .-. . ;;:; ..:.; - ;. ; -. , -. - ..- -... - -. . jf / -. / .. ; . -. LJ -V, .. “- .-. .-:. -. . - - - - -...- ... -: - :. .-.- - .-. -: Ш4  /////// // // // // // x x-  ///////////////////// /// ///////////// ////// // // At / / //// 7/7 (rig. 3  7 / X f7jfjr} sf // / (e //    BUT . ./ /: jshk .. - .-, - L- G - L . . , A - 7: -. L, ...; y. -. -. . A.-.-. L -.-- , -. - ..- -... - -. . jf / -. / .. ; . -. LJ -V, .. “- .-. .-:. -. . - - - - -...- ... -: - :. .-.- - .-. -: Ш4 / 7 / ftyf77fJ / G I