SU1493714A1 - Method of preparing rock bed of dam - Google Patents

Abstract

FIELD OF THE INVENTION The invention relates to hydraulic engineering. The purpose of the invention is to reduce material consumption and increase the reliability of operation of the dam. In the method of preparing the soil base of the dam, which includes the compaction of the soil, the base is compacted in the direction of increasing the load from the dam with separate maps partially overlapping each other. The width of each map is set equal to the values determined depending on the mass of the earth embankment of the dam and the average formation of slopes. Each map is compacted to a modulus of deformation determined by directly proportional to the weight of the earth mound in the sections corresponding to the outer face of the map. 2 Il.

Description

The invention relates to hydraulic construction, in particular to methods for preparing a subsoil base of dams, and can be used in preparing the bases for the construction of hydraulic structures, irrigation and drainage and waterworks for various purposes in normal conditions and undermined groups IV.

The purpose of the invention is to reduce material consumption and increase the reliability of operation of the facility.

FIG. 1 shows the structure and basement, cross section; FIG. 2 is a section A-A in FIG. one.

The method is carried out as follows.

The soil foundation 1 of dam 2 with spillway 4 located in its body 3 or at the base 1 is divided into maps 5. The width of each map is set equal to the values determined by the formula

1 {: li-, -С Aki, k.

1, Ro-t, where UKi 57GT; , 2;

1 -: Zirin of card with number i (1 i i p), m;

n is the number of cards;

D ..

Л71 snapping the outer edges of the map with the number i to the previously compacted map from the top

about with

VOGO and lower slopes, respectively, m;

average laying, respectively, of the upstream and downstream slopes in the sections adjacent to the outer edges of the card with the number i;

t.i ,,

the proportion of the soil of the dam in the sections adjacent to the outer edges of the map with the number i, kN / m;

P, is the minimum load from the weight of the dirt embankment,

1.25,

1/4 - empirical coefficient and

the coefficient derived from it as a result of deriving the formula is 1/4, equal to (1.25-1). Each card 5 is compacted with t

rammers or pounding up

set value deformation modulus

one

determined by the formula

Ei Eopl-,

 about

where E- is the modulus of deformation of the i-th card

MPa; ЕО - modulus of soil deformation

base cross-section with a minimum load on the base, MPa;

P is the load of the weight of the dirt embankment in the sections corresponding to the outer face of the map with number i, kN / m. In this case, the deformation modulus of the compacted card 5 should not exceed the deformation modulus E., the previous card 6 by more than 1.25 times. The breakdown into maps 5 partially overlapping one another in the plan is made in the direction of increasing the load from the structure, starting with a new map 6, the outer faces 7 of which are placed in section 8 with a minimum load PO on the weight of the embankment. The position in the plan and the width of each subsequent card 5, whose outer faces 9 are placed in section 10 with a load P not exceeding the load P in the previous section more than 1.25 times, is set, setting the values of

7t

FROM the outer edges of the previous card 7 from the top 11 and bottom 12 slopes.

Claims (1)

Invention Formula The method of preparing the soil base of the dam, including compaction of soil with maps, characterized in that, in order to reduce material intensity and increase the reliability of operation of the dam, the base is compacted in the direction of increasing the load from the dam with separate maps partially crossing one the width is set equal to the values determined by the formula. i i- (UKi 0 five where is D Hi 12.25; m . five , 2;  Ro 1 {- the width of the card with the number i (1 i p), m; n is the number of cards; Dp L "1 - attachment of the outer edges of the map with the number {) ohm i to the previously sealing map from the upstream and downstream slopes, respectively, m; year m, j ""and. g ". average laying, respectively, of the upstream and downstream slopes in the sections adjacent to the outer edges of the card with the number i; - the specific gravity of the soil of the dam in the sections adjacent to the outer face of the map with the number i, kN / m; PJJ - minimal weight load embankment, and the compaction of each face is made to the values of the moduli of deformation, determined by the formula E, E. | H where E is the strain modulus of the i-th card; Her - modulus of soil deformation base cross-section with a minimum load on the base, MPa; P - load from the weight of the soil embankments in sections corresponding to the outer edge of the map with the number i, kN / m. 12 6-7