CN210368867U

CN210368867U - Superimposed structure of homogeneity earth dam and rock-fill dam

Info

Publication number: CN210368867U
Application number: CN201921046588.9U
Authority: CN
Inventors: 万山红; 付亚东; 史海峰
Original assignee: Sinohydro Bureau 5 Co Ltd
Current assignee: Sinohydro Bureau 5 Co Ltd
Priority date: 2019-07-06
Filing date: 2019-07-06
Publication date: 2020-04-21
Anticipated expiration: 2029-07-06

Abstract

The utility model discloses a superposed structure of a homogeneous earth dam and a rock-fill dam, which comprises a lower homogeneous earth dam and an upper rock-fill dam; geotextile is laid at the contact interface of the homogeneous earth dam and the rock-fill dam, a plurality of geogrids are arranged below the geotextile at intervals, and rolling soil is filled between each layer of geogrid; the rock-fill dam has the following structure: a plurality of reinforcement gabions are fixed on the upstream surface and the downstream surface, a plurality of reinforcements are fixed between the reinforcement gabions on the upstream surface and the downstream surface in parallel, and rockfill is filled between each layer of reinforcements; every layer of reinforcement gabion that is located the upper reaches face adopts trapezoidal section, and the upper reaches face of being convenient for sets gradually concrete cushion and barrier layer, and every layer of reinforcement gabion that is located the low reaches face adopts the rectangle section. The utility model discloses superimposed structure has narrowed the dam foundation width as far as possible on satisfying the stable basis of dykes and dams design, has reduced the area coverage, has also reduced stone side quantity and cost.

Description

Superimposed structure of homogeneity earth dam and rock-fill dam

Technical Field

The utility model relates to a dykes and dams field among the hydraulic and hydroelectric engineering, especially a superimposed structure of homogeneity earth dam and rock-fill dam.

Background

Dikes are broadly defined as buildings and structures for retaining water, and are classified into various types according to the materials and types of damming, and earth-rock dams are constructed using earth or rockfill, and are made of ordinary and inexpensive local materials. Dikes are typically constructed at locations remote from residential areas.

With the rapid development of economy in China, in the construction of dykes in hydraulic engineering, due to factors such as the built buildings or difficulty in land acquisition, more and more pools or dykes have narrow construction space, and new dam types need to be designed to meet the terrain conditions of narrow construction sites.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that a superimposed structure of homogeneity earth dam and rock-fill dam is provided, can satisfy stability, satisfy the prevention of seepage requirement, also adapt to narrow construction space.

In order to solve the technical problem, the utility model discloses a technical scheme is:

a superimposed structure of homogeneous earth dam and rock-fill dam comprises a lower homogeneous earth dam and an upper rock-fill dam; geotextile is laid at the contact interface of the homogeneous earth dam and the rock-fill dam, a plurality of geogrids are arranged below the geotextile at intervals, and rolling soil is filled between each layer of geogrid;

the rock-fill dam has the following structure: a plurality of reinforcement gabions are fixed on the upstream surface and the downstream surface, a plurality of reinforcements are fixed between the reinforcement gabions on the upstream surface and the downstream surface in parallel, and rockfill is filled between each layer of reinforcements; every layer of reinforcement gabion that is located the upper reaches face adopts trapezoidal section, and the upper reaches face of being convenient for sets gradually concrete cushion and barrier layer, and every layer of reinforcement gabion that is located the low reaches face adopts the rectangle section.

Furthermore, the impermeable layer adopts a composite geomembrane.

Further, the specification of the geotextile is 500g/m²。

Furthermore, the two ends of the steel bar are provided with hooks, and the steel bar is fixed on the steel bar gabion through the hooks.

Compared with the prior art, the beneficial effects of the utility model are that: on the basis of meeting the design stability of the dam, the width of the dam foundation is narrowed as much as possible, and the using amount of the stone is reduced; and the local materials and various geotechnical materials (such as non-woven fabrics, geogrids, composite geomembranes and the like) are fully utilized, so that the engineering cost is reduced; the structure is also suitable for dam and pool water retaining structures with the height less than 20 m.

Drawings

FIG. 1 is a schematic view of the whole laminated structure of the homogeneous earth dam and the rock-fill dam of the present invention;

FIG. 2 is a schematic view of a portion of the structural rockfill dam of the present invention;

FIG. 3 is an enlarged schematic view at A in FIG. 2;

FIG. 4 is an enlarged schematic view at B of FIG. 2;

fig. 5 is an enlarged schematic view at C in fig. 2.

In the figure: 1-homogenizing soil dam; 2-rockfill dam; 3-geotextile; 4-rolling the soil; 5-geogrid; 6-rockfill; 7-reinforcing steel bars; 8-a steel reinforcement gabion; 9-concrete cushion; 10-barrier layer.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

The utility model discloses superimposed structure is the dam type that designs according to job site's space size, is mainly that the dam foundation width is too little to be restricted, uses this kind of dam type when having to reduce the dam foundation width. In order to reduce the cost, the bottom of the dam is designed as a conventional homogeneous earth dam 1 according to the site construction space and the local building materials; the upper and lower surfaces of the upper part are both provided with a reinforcement gabion 8, and the upper and middle upper surfaces are filled with rockfill 6 in a layered manner; the upstream face of the laminated dam body is impermeable with a composite geomembrane as shown in figures 1 and 2.

In order to increase the soil body strength, a geogrid 5 is added in a soil layer near the interface of the homogeneous earth dam 1 and the rock-fill dam 2; in order to prevent the clay particles in the homogeneous dam 1 from being taken away by the leakage water, the geotextile 3 is laid on the interface, and the specification of the geotextile 3 is 500g/m²As shown in fig. 3. When the upper reinforcement gabion 8 is installed in a layered mode, reinforcements 7 are laid in a layered mode, and hooks are arranged at two ends of each reinforcement 7; the reinforcement gabion 8 on the upstream face adoptsThe dam is of a trapezoidal section, a 10cm concrete cushion 9 is poured and leveled after the dam body is constructed to the top, so that the construction of an impermeable layer 10 of an upstream slope surface of a subsequent laminated structure is facilitated, and a composite geomembrane can be used as the impermeable layer 10, as shown in fig. 4; the downstream face reinforcement gabion 8 is of rectangular cross-section as shown in figure 5.

Specifically, the utility model discloses a superimposed structure of homogeneous earth dam and rock-fill dam, including homogeneous earth dam 1 of lower part and rock-fill dam 2 of upper part; geotextile 3 is laid at the contact interface of the homogeneous earth dam 1 and the rock-fill dam 2, a plurality of geogrids 5 are arranged below the geotextile 3 at intervals, and rolling soil 4 is filled between each layer of geogrid 5; the rock-fill dam 2 has the following structure: a plurality of reinforcement gabions 8 are fixed on the upstream surface and the downstream surface, a plurality of reinforcements 7 are fixed between the reinforcement gabions 8 on the upstream surface and the downstream surface in parallel, and rockfill 6 is filled between each layer of reinforcements 7; every layer of reinforcement gabion 8 that is located the upper reaches face adopts trapezoidal section, and the upper reaches face of being convenient for sets gradually concrete cushion 9 and barrier layer 10, and every layer of reinforcement gabion 8 that is located the lower reaches face adopts the rectangle section.

The utility model discloses homogeneity earth dam and rock-fill dam's congruent structure's construction mode as follows:

1) filling the homogeneous dam 1 in layers, and additionally laying geogrids 5 in layers when filling the homogeneous dam 1; rolled soil 4 is filled between each layer of geogrid 5, and when the rolled soil 4 is filled to the top, geotextile 3 is laid, and the geotextile 3 plays a role in reverse filtration;

2) the reinforcement gabion 8 is processed outside the site and transported to the site; the self-dumping truck transports the stone to the dam body which is filled nearby; manually sorting qualified stone materials, and loading the stone materials into reinforcement gabions 8 on the upstream surface and the downstream surface;

in order to facilitate the laying of the anti-seepage composite geomembrane on the upstream surface, the reinforcement gabion 8 on the upstream surface is made into an inclined surface which is consistent with the gradient of the dam; after the reinforcement gabion 8 is piled up to the top, a concrete cushion 9 is poured on the surface of the upstream reinforcement gabion 8, the thickness of the concrete cushion 9 is 10cm, and the concrete cushion is manually leveled to serve as a cushion surface of the composite geomembrane;

3) an impermeable layer 10 is laid on the concrete pad 9 and extends to the toe of the homogeneous dam 1.

4) A reinforcement gabion 8 is arranged on the downstream surface, and the reinforcement gabion 8 adopts a rectangular section;

5) filling and rolling rockfill 6 between the reinforcement gabions 8 on the upstream surface and the downstream surface in a layered manner; when each layer of rockfill 6 is filled to be consistent with the height of the reinforcement gabion 8, a layer of reinforcement 7 is laid on the filling surface of the rockfill 6, the diameter of the reinforcement 7 is 18mm, the interval is 2m, the length of the reinforcement 7 is equal to the interval between the reinforcement gabions 8 on the upstream and downstream surfaces, and two ends of the reinforcement 7 are hooked and hung on the reinforcement gabion 8.

Because the construction site at the top is narrow, in order to avoid damage to the reinforcement gabion 8 caused by paving and rolling equipment, small construction equipment is adopted at the top as much as possible, particularly stones which are close to the reinforcement gabion 8 within the range of 50-80 cm are carefully paved, and a hand-held vibration rolling thin layer is adopted for rolling.

Claims

1. A superimposed structure of homogeneous earth dam and rock-fill dam, characterized by that, include homogeneous earth dam (1) and upper rock-fill dam (2) of inferior part; geotextile (3) is laid at the contact interface of the homogeneous earth dam (1) and the rock-fill dam (2), a plurality of geogrids (5) are arranged below the geotextile (3) at intervals, and rolling soil (4) is filled between each layer of geogrid (5);

the rock-fill dam (2) has the following structure: a plurality of reinforcement gabions (8) are fixed on the upstream surface and the downstream surface, a plurality of reinforcements (7) are fixed between the reinforcement gabions (8) on the upstream surface and the downstream surface in parallel, and rockfill (6) is filled between each layer of reinforcements (7); every layer of reinforcement gabion (8) that is located the upper reaches face adopts trapezoidal section, and the upper reaches face of being convenient for sets gradually concrete cushion (9) and barrier layer (10), and every layer of reinforcement gabion (8) that is located the low reaches face adopts the rectangle section.

2. A laminated structure of a homogeneous earth dam and a rock-fill dam as claimed in claim 1, wherein said barrier layer (10) is a composite geomembrane.

3. A superimposed structure of homogeneous earth and rockfill dams according to claim 1, wherein said geotextile (3) has a size of 500g/m²。

4. A laminated structure of a homogeneous earth dam and a rock-fill dam as claimed in claim 1, wherein both ends of said reinforcing bars (7) are provided with hooks, and are fixed to the reinforcing bar gabion (8) by means of the hooks.