CN110241789B - Superimposed structure of homogeneous earth dam and rock-fill dam and construction method thereof - Google Patents
Superimposed structure of homogeneous earth dam and rock-fill dam and construction method thereof Download PDFInfo
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- CN110241789B CN110241789B CN201910606846.2A CN201910606846A CN110241789B CN 110241789 B CN110241789 B CN 110241789B CN 201910606846 A CN201910606846 A CN 201910606846A CN 110241789 B CN110241789 B CN 110241789B
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- fill
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- 238000010276 construction Methods 0.000 title abstract description 16
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 30
- 238000005096 rolling process Methods 0.000 claims abstract description 15
- 239000002689 soil Substances 0.000 claims abstract description 12
- 239000004575 stone Substances 0.000 claims abstract description 12
- 239000004744 fabric Substances 0.000 claims abstract description 9
- 239000002131 composite material Substances 0.000 claims description 11
- 239000004746 geotextile Substances 0.000 claims description 8
- 239000011435 rock Substances 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 5
- 238000005056 compaction Methods 0.000 claims 1
- 238000000034 method Methods 0.000 claims 1
- 230000003014 reinforcing effect Effects 0.000 claims 1
- 229910000831 Steel Inorganic materials 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000000227 grinding Methods 0.000 description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 239000004035 construction material Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- -1 geogrids Substances 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B7/00—Barrages or weirs; Layout, construction, methods of, or devices for, making same
- E02B7/02—Fixed barrages
- E02B7/04—Dams across valleys
- E02B7/06—Earth-fill dams; Rock-fill dams
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Revetment (AREA)
Abstract
The invention discloses a superimposed structure of a homogeneous earth dam and a rock-fill dam and a construction method thereof, wherein the superimposed structure comprises a homogeneous earth dam at the lower part and a rock-fill dam at the upper part; geotechnical cloth is paved at the contact interface of the homogeneous earth dam and the rock-fill dam, a plurality of geogrids are arranged below the geotechnical cloth at intervals, and rolling soil is filled between each layer of geogrids; the rock-fill dam has the following structure: a plurality of reinforced gabions are fixed on the upstream surface and the downstream surface, a plurality of reinforced gabions are fixed in parallel between the reinforced gabions on the upstream surface and the downstream surface, and piled stones are filled between each layer of reinforced gabions; each layer of reinforced gabion located on the upstream face adopts a trapezoid section, so that the concrete cushion layer and the impermeable layer are sequentially arranged on the upstream face, and each layer of reinforced gabion located on the downstream face adopts a rectangle section. The superposition structure of the invention reduces the width of the dam foundation as much as possible on the basis of meeting the design stability of the dam, reduces the occupied area and reduces the use amount and cost of the stone.
Description
Technical Field
The invention relates to the field of dams in water conservancy and hydropower engineering, in particular to a superposition structure of a homogeneous earth dam and a rock-fill dam and a construction method thereof.
Background
Dykes and dams generally refer to water-retaining buildings and structures, and the dykes and dams are divided into a plurality of types according to the material and the type of the dam, and earth-rock dams are constructed by using earth or rock-fill, and are made of common and cheap local materials. Typically, the dikes are built in places far from the residential area.
Along with the rapid development of the economy in China, in the construction of the embankment of the hydraulic engineering, due to factors such as the difficulty in building or land characterization already built, more and more ponds or embankment engineering construction spaces are narrow, and new embankment types need to be designed to meet the narrow construction site topography conditions.
Disclosure of Invention
The invention aims to solve the technical problem of providing a superposition structure of a homogeneous earth dam and a rock-fill dam and a construction method thereof, which can meet the stability and the anti-seepage requirements and adapt to a narrow construction space.
In order to solve the technical problems, the invention adopts the following technical scheme:
a superimposed structure of a homogeneous earth dam and a rock-fill dam comprises a homogeneous earth dam at the lower part and a rock-fill dam at the upper part; geotechnical cloth is paved at the contact interface of the homogeneous earth dam and the rock-fill dam, a plurality of geogrids are arranged below the geotechnical cloth at intervals, and rolling soil is filled between each layer of geogrids;
The rock-fill dam has the following structure: a plurality of reinforced gabions are fixed on the upstream surface and the downstream surface, a plurality of reinforced gabions are fixed in parallel between the reinforced gabions on the upstream surface and the downstream surface, and piled stones are filled between each layer of reinforced gabions; each layer of reinforced gabion located on the upstream face adopts a trapezoid section, so that the concrete cushion layer and the impermeable layer are sequentially arranged on the upstream face, and each layer of reinforced gabion located on the downstream face adopts a rectangle section.
Furthermore, the impermeable layer adopts a composite geomembrane.
Further, the specification of the geotextile is 500g/m 2.
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.
The invention provides a construction method of an overlapped structure of a homogeneous earth dam and a rock-fill dam, which comprises the following steps:
step 1: filling the homogeneous earth dam in layers, and paving geogrids in layers when filling the homogeneous earth dam to the top of the homogeneous earth dam; filling rolling soil among each layer of geogrid, and paving geotechnical cloth when the rolling soil is filled to the top;
step 2: loading the reinforced gabion into the stone; the reinforcement gabion on the upstream surface is made into an inclined plane and is consistent with the slope of the dam; after the reinforced gabion is piled up to the top, pouring a concrete cushion layer on the surface of the reinforced gabion and trowelling, and arranging an impermeable layer on the surface of the concrete cushion layer, wherein the impermeable layer extends to the slope toe of the homogeneous earth dam;
step 3: arranging a reinforced gabion on the downstream surface, wherein the reinforced gabion adopts a rectangular section;
Step 4: filling rock piles between the reinforced gabions on the upstream surface and the downstream surface and carrying out layered rolling; when each layer of rock-fill is filled to the height of the reinforced gabion to be consistent, a layer of reinforced bars are paved on the rock-fill surface, and the two ends of the reinforced bars are hooked on the reinforced gabion.
Compared with the prior art, the invention has the beneficial effects 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 use amount of stone is reduced; 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 an overall schematic view of a stacked structure of a homogeneous earth dam and a rock-fill dam of the present invention;
FIG. 2 is a schematic view of a portion of a rock-fill dam constructed in accordance with the present invention;
FIG. 3 is an enlarged schematic view of FIG. 2 at A;
FIG. 4 is an enlarged schematic view of FIG. 2 at B;
Fig. 5 is an enlarged schematic view at C in fig. 2.
In the figure: 1-homogenizing a soil dam; 2-rock-fill dams; 3-geotextile; 4-rolling soil; 5-geogrid; 6-stacking stones; 7-reinforcing steel bars; 8-reinforcement gabion; 9-concrete cushion; 10-impermeable layer.
Detailed Description
The invention will be described in further detail with reference to the drawings and the detailed description.
The laminated structure is designed according to the space size of a construction site, and is mainly limited by the fact that the width of a dam foundation is too small, and the dam is used when the width of the dam foundation is required to be reduced. To reduce the cost, the bottom of the dike is designed as a conventional homogeneous earth dam 1 according to the site construction space and the local construction materials; the upper and the lower surfaces of the upper part are reinforced gabions 8, and the upper upstream surface and the middle part are filled with rock piles 6 in a layered manner; the upstream face of the laminated dam body is impermeable by adopting a composite geomembrane, as shown in fig. 1 and 2.
In order to increase the soil intensity, a geogrid 5 is added in the soil layer near the interface of the homogeneous earth dam 1 and the rock-fill dam 2; to prevent the leakage water from taking away the clay particles in the homogeneous earth dam 1, geotextile 3 is laid on the interface, and the specification of geotextile 3 is 500g/m 2, as shown in fig. 3. When the upper steel bar gabion 8 is installed in a layered manner, steel bars 7 are paved in a layered manner, and hooks are arranged at two ends of the steel bars 7; the reinforced gabion 8 on the upstream face adopts a trapezoid section, and after the dam body is constructed to the top, a 10cm concrete cushion layer 9 is poured and trowelled, so that the construction of an upstream slope impermeable layer 10 of a subsequent superposed structure is facilitated, and a composite geomembrane can be adopted as the impermeable layer 10, as shown in fig. 4; the gabion 8 of the downstream face adopts a rectangular cross section as shown in figure 5.
Specifically, the superposition structure of the homogeneous earth dam and the rock-fill dam comprises a lower homogeneous earth dam 1 and an upper rock-fill dam 2; geotechnical cloth 3 is paved 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 geotechnical cloth 3 at intervals, and rolling soil 4 is filled between each layer of geogrids 5; the rock-fill dam 2 has the following structure: a plurality of reinforced gabions 8 are fixed on the upstream surface and the downstream surface, a plurality of reinforced bars 7 are fixed in parallel between the reinforced gabions 8 on the upstream surface and the downstream surface, and piled stones 6 are filled between each layer of reinforced bars 7; each layer of reinforced gabion 8 positioned on the upstream face adopts a trapezoid section, so that the concrete cushion layer 9 and the impermeable layer 10 are sequentially arranged on the upstream face, and each layer of reinforced gabion 8 positioned on the downstream face adopts a rectangular section.
The construction mode of the laminated structure of the homogeneous earth dam and the rock-fill dam is as follows:
1) Filling the homogeneous earth dam 1 in layers, and additionally paving geogrids 5 in layers when filling the homogeneous earth dam 1; the rolling soil 4 is filled between each layer of geogrid 5, and when the rolling soil 4 is filled to the top, geotextile 3 is paved, and the geotextile 3 plays a role in reverse filtration;
2) The reinforced gabion 8 is processed outside the site and transported to the site; the self-unloading truck conveys stones to a dam filled nearby; manually sorting qualified stones, and loading the qualified stones into a reinforced gabion 8 on the upstream surface and the downstream surface;
For conveniently paving a composite geomembrane for seepage prevention on an upstream surface, a reinforced gabion 8 on the upstream surface is made into an inclined plane which is consistent with the gradient of a dyke; after the reinforced gabion 8 is piled up to the top, pouring a concrete cushion layer 9 on the surface of the reinforced gabion 8 at the upstream, wherein the thickness of the concrete cushion layer 9 is 10cm, and manually trowelling to be used as a cushion layer of the composite geomembrane;
3) A barrier layer 10 is laid on top of the concrete cushion layer 9 and extends to the toe of the homogenous earth dam 1.
4) Arranging a reinforced gabion 8 on the downstream surface, wherein the reinforced gabion 8 adopts a rectangular section;
5) Filling rock piles 6 between the reinforced gabions 8 on the upstream surface and the downstream surface and carrying out layered rolling; when each layer of rock-fill 6 is filled to be consistent with the height of the reinforced gabion 8, a layer of reinforced bars 7 is paved on the filling surface of the rock-fill 6, the diameter of the reinforced bars 7 is 18mm, the distance is 2m, the length is equal to the distance between the reinforced gabions 8 on the upstream surface and the downstream surface, hooks at two ends of the reinforced bars 7 are hung on the reinforced gabion 8.
Because of the narrow construction site at the top, small construction equipment, especially stones within 50-80 cm close to the reinforced gabion 8, should be used as far as possible, and hand-held vibration thin layer grinding should be used for carefully paving in order to avoid damage to the reinforced gabion 8 by paving and grinding equipment.
Claims (5)
1. The laminated structure of the homogeneous earth dam and the rock-fill dam is characterized by comprising a lower homogeneous earth dam (1) and an upper rock-fill dam (2); geotechnical cloth (3) is paved 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 geotechnical cloth (3) at intervals, and rolling compaction soil (4) is filled between each layer of geogrids (5); the rock-fill dam (2) has the following structure: a plurality of reinforced gabions (8) are fixed on the upstream surface and the downstream surface, a plurality of reinforced bars (7) are fixed in parallel between the reinforced gabions (8) on the upstream surface and the downstream surface, and piled stones (6) are filled between each layer of reinforced bars (7); each layer of reinforced gabion (8) positioned on the upstream face adopts a trapezoid section, so that the concrete cushion layer (9) and the impermeable layer (10) are sequentially arranged on the upstream face, and each layer of reinforced gabion (8) positioned on the downstream face adopts a rectangle section.
2. A composite structure of a homogeneous earth and rockfill dam according to claim 1, wherein the impermeable layer (10) is a composite geomembrane.
3. A composite structure of a homogeneous earth and rockfill dam according to claim 1, wherein the geotextile (3) has a gauge of 500g/m 2.
4. A composite structure of a homogeneous earth and rockfill dam according to claim 1, wherein the reinforcing bars (7) are provided at both ends with hooks by means of which they are secured to the gabion (8).
5. A method of constructing a composite structure of a homogeneous earth and rockfill dam according to claim 1, comprising the steps of:
step 1: filling the homogeneous earth dam (1) in layers, and paving geogrids (5) in layers when filling the homogeneous earth dam (1) to the top; the earth rolling machine is characterized in that rolling earth (4) is filled among each layer of geogrid (5), and geotextiles (3) are paved when the rolling earth (4) is filled to the top;
Step 2: loading the reinforced gabions (8) into the rock material; the reinforced gabion (8) on the upstream surface is made into an inclined plane and is consistent with the slope of the dam; after the reinforced gabion (8) is piled up to the top, pouring a concrete cushion layer (9) on the surface of the reinforced gabion (8) and trowelling, and paving an impermeable layer (10) on the surface of the concrete cushion layer (9);
Step 3: arranging a reinforced gabion (8) on the downstream surface, wherein the reinforced gabion (8) on the downstream surface adopts a rectangular section;
step 4: filling rock piles (6) between the reinforced gabions (8) on the upstream surface and the downstream surface and carrying out layered rolling; when each layer of rock-fill (6) is filled to the height of the reinforced gabion (8) to be consistent, a layer of reinforced bars (7) is paved on the filling surface of the rock-fill (6), and two ends of the reinforced bars (7) are hooked on the reinforced gabion (8).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910606846.2A CN110241789B (en) | 2019-07-06 | 2019-07-06 | Superimposed structure of homogeneous earth dam and rock-fill dam and construction method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910606846.2A CN110241789B (en) | 2019-07-06 | 2019-07-06 | Superimposed structure of homogeneous earth dam and rock-fill dam and construction method thereof |
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| CN110241789A CN110241789A (en) | 2019-09-17 |
| CN110241789B true CN110241789B (en) | 2024-06-18 |
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| CN210368867U (en) * | 2019-07-06 | 2020-04-21 | 中国水利水电第五工程局有限公司 | Superimposed structure of homogeneity earth dam and rock-fill dam |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US4266885A (en) * | 1977-07-13 | 1981-05-12 | Ohbayashi-Gumi Ltd. | Method of constructing a continuous cut-off wall and a core of a fill-type dam |
| KR100406874B1 (en) * | 2000-09-20 | 2003-11-21 | 금호엔지니어링 (주) | Repairing method of earth-fill dam |
| CN102587322A (en) * | 2011-01-11 | 2012-07-18 | 中国水利水电建设工程咨询公司 | Metal mesh box revetment structure of earth-rock dam and construction method of metal mesh box revetment structure |
| CN102261053B (en) * | 2011-05-12 | 2013-03-06 | 河海大学 | Aseismatic measure of high earth-rock dam and construction method thereof |
| CN103233447B (en) * | 2013-05-06 | 2015-01-07 | 大连理工大学 | High concrete face rockfill dam seismic strengthening structure and construction method thereof |
| CN105064288B (en) * | 2015-08-04 | 2017-07-04 | 中国电建集团华东勘测设计研究院有限公司 | The mixing structure of dam type and construction method of a kind of concrete dam and earth and rockfill dam |
| CN106759133A (en) * | 2017-01-13 | 2017-05-31 | 中国电建集团华东勘测设计研究院有限公司 | The mixing structure of dam type and construction method of a kind of homogeneous earth and rockfill dam and rock |
| CN107447731B (en) * | 2017-07-28 | 2019-09-03 | 中国科学院、水利部成都山地灾害与环境研究所 | A kind of mixed dam and its construction method |
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