SU1444465A1 - Method of erecting counter-seepage screen of hydraulic structure - Google Patents

Abstract

The invention relates to the field of hydraulic engineering. The purpose of the invention is to reduce the construction time and improve the quality of facilities. The construction of the anti-filter screen 2 is carried out simultaneously with the filling of the reservoir after the construction of the dam 1 with injection fixed an arbor; its solution into the wells 5. The wells are drilled at an angle of 90 ° C; to the upper slope of the dam. At the same time, the wells 5 are drilled to a depth equal to the thickness of the screen 2 at a distance from each other, defined by the formula rmul8 Hp / 3 (2Kts-b) / / 2 vH + m, where H p is the vertical distance between the rows wells, m; i R - radius of the colmatadium zone from one well, m; b is a parameter that takes into account the interface of closure zones, m; m - the laying of the upper slope. The creation of an anti-filtration screen 2 is carried out by the clogging of the soil material of the dam 1 due to pressure filtration that occurs in the pore medium between the large particles and the small fractions of the solution. 2 Il. (L 4ib .4: 4ih 4 cl tftuf.i

Description

one

The invention relates to hydraulic engineering, the technology of production of works on the installation of an anti-screening screen during the construction of hydraulic structures erected from ground materials, mainly from pebbles or stony soils, land reclamation and water management.

Nin,

The purpose of the invention is to reduce the volume of land works and improve the quality of the structure.

FIG. 1 shows a hydraulic structure, section A-A in FIG. 2; FIG. 2 is a section BB in FIG. one,

The method of erection of the anti-filtration screen of a hydraulic structure, such as a dam, is carried out in the following sequence.

A dam 1 is built up partly or on a full profile with the upper slope m laid down. Then, for the device of the anti-filtration screen 2, taking into account the thickness of the active zone 3 exposed to wave action, the drilling rig 4 is installed on a special pontoon from the upper pool the dead volume of the reservoir as it is filled, along the construction of the drill 90

lonely at an angle

to the upper side

well 5 to a depth which, taking into account the penetration of the solution into the soil, is the calculated thickness of screen 2. During the drilling of the well, as well as after its completion into it under pressure (clay is injected with a consistency from 1.10 to 1.50 tons / m, which is fed through the slurry pipeline 6 laid on the pontoons 7. Thus, the screen 2 is soaked by pressure filtration that occurs in the pore medium between the large particles, which facilitates the transfer and placement of the fine fractions of the solution in the pores between the large soil particles. Besides In addition, boreholes 5, arranged in a staggered order, create uniformity of pore filling in the body of the upper slope, increase the stability of the upper pool active zone thickness, provide

sufficient water resistance and wave resistance of the screen 2, and the number of wells 5 is determined by the formula

H

 - / li2Kk; b) 2 (/ 1 + m)

where k

CKS

K. b - m vertical distance between rows of wells, m; clogging zone radius from one well, m; ; overlap of clogging zones, m; the laying of the upper slope.

Claims (1)

The filtration that occurs when the water level in the reservoir rises also contributes to the transfer of clay particles to large distances deep into the dam bodies, where they, enveloping large particles and combining with small ones, reduce pores with subsequent clogging of them. Invention Formula A method for erecting a screen of a hydraulic structure, predominantly composed of coarse-grained material, includes clogging the upper slope by injecting a fixing solution into pre-drilled wells in the upper slope and filling reservoir, u and with the fact that. differing in order to shorten the construction time by reducing the scope of work and increasing the quality of the construction, clogging is carried out simultaneously with filling the reservoir, and the wells for injecting the fixing solution are arranged in a checkerboard pattern and the radius is determined by the formula   i3 (2,) and p 2 (/ 1 tb where h f vertical distance between rows of wells, m; K - radius of clogging zone from one well, m; b - zone overlap colmatation; m - the laying of the upper slope.