CN112195874B - High homogeneity dam of dispersion soil - Google Patents
High homogeneity dam of dispersion soil Download PDFInfo
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- CN112195874B CN112195874B CN202010933184.2A CN202010933184A CN112195874B CN 112195874 B CN112195874 B CN 112195874B CN 202010933184 A CN202010933184 A CN 202010933184A CN 112195874 B CN112195874 B CN 112195874B
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- 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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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B3/00—Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
- E02B3/04—Structures or apparatus for, or methods of, protecting banks, coasts, or harbours
- E02B3/12—Revetment of banks, dams, watercourses, or the like, e.g. the sea-floor
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B3/00—Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
- E02B3/16—Sealings or joints
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Abstract
The invention belongs to the technical field of earth and rockfill dam construction, and particularly relates to a high-homogeneity dam for dispersive soil. The invention comprises an upstream slope protection, a protective layer, a geomembrane, geotextile, a dispersible soil material area, a modified dispersible soil material area, prism drainage, mattress drainage and a downstream slope protection; the dispersive soil material area is a trapezoid filled by dispersive soil materials. The surface of the upstream side dam is paved with a geomembrane, the upper surface of the geomembrane is paved with a protective layer, and the upper surface of the protective layer is paved with an upstream slope protection; the surface of the downstream side dam is paved with geotextile, the surface of the geotextile is paved with a downstream slope protection, and the lower end of the geotextile extends to the downstream of the downstream side dam; a modified dispersible soil area is laid at the bottom of the dispersible soil area; mattress drainage and prism drainage are arranged at the bottom of the downstream side dam from inside to outside, and geotextile is laid at the upstream side and the bottom of the mattress drainage and the prism drainage. The invention effectively solves the problems of seepage-proofing reliability, durability and seepage damage of the high-homogeneity dam.
Description
Technical Field
The invention belongs to the technical field of earth and rockfill dam construction, and particularly relates to a high-homogeneity dam for dispersive soil.
Background
The homogeneous dam is a dam type commonly adopted in low and medium dams, and is adopted only when the dam site is lack of other materials except soil materials.
The cohesive force of the dispersive clay among fine particles in the water with low salt content is mostly or even completely disappeared, the particles in the aggregate are automatically dispersed into the original clay particles, suspended in the water and lost along with the permeating water, and large-area erosion appearsHoles or sudden piping failures. The dispersive clay is classified according to plasticity, mostly belongs to medium plasticity, and classified according to particle grading, and belongs to light-weight silty loam. The permeability coefficient of such soils is generally less than 1X 10-7cm/s, belonging to the low permeability soils. The most significant engineering characteristic of dispersive clay is its low erosion resistance. Both domestic and foreign engineering cases of damage caused by adopting dispersive clay for seepage prevention exist.
The dam is built by using dispersive clay at home and abroad. Building a dam by using the dispersive clay, wherein the height of the foreign core wall dam exceeds one hundred meters and is up to 109 m; the application is mainly applied to medium and low dams in China, and no successful case of high dam application exists. The dam height of homogeneous dams built by using dispersive earth at home and abroad is generally limited to medium and low dams.
The safety problem of the dam working community for the dispersive earth damming mainly has the following problems: (1) the ability of the dispersive earth to resist osmotic damage under high dam conditions cannot be accurately predicted. (2) The property of the dispersive soil material is modified to inhibit the dispersibility of the dispersive soil material, and a proper filter material is selected to prevent the loss of soil particles. But the reliability of these measures for high dams remains to be verified.
The safety problem of a dam working boundary to a high-homogeneity dam (the dam height is more than 70 m) is mainly concerned about that the settlement of a high-homogeneity dam body is too large after filling, so that the high-homogeneity dam body cracks, a leakage channel is generated, and the safety of the dam is influenced.
Disclosure of Invention
The invention provides a high-homogeneity dam of dispersive soil, aiming at providing a high-homogeneity dam which can fully exert the respective advantages and comprehensive advantages of geomembrane, dispersive soil materials and reverse filtering materials, technically solve the problems of sedimentation and seepage damage of a high-homogeneity dam body in the high-homogeneity dam, obviously enhance the reliability, durability and safety of an anti-seepage structure of the high-homogeneity dam body and have good social, economic and environmental ecological benefits.
In order to achieve the purpose, the invention adopts the technical scheme that:
a high-homogeneity dam of dispersive soil comprises an upstream slope protection, a protective layer, a geomembrane, a geotextile, a dispersive soil material area, a modified dispersive soil material area, a prism drainage body, mattress drainage, a downstream slope protection, an upstream side dam and a downstream side dam; the dispersive soil material area is a trapezoid formed by filling dispersive soil materials; the upper surface of the upstream side dam is paved with a geomembrane, the upper surface of the geomembrane is paved with a protective layer, and the upper surface of the protective layer is paved with an upstream slope protection; geotextile is laid on the surface of the downstream side dam, a downstream protective slope is laid on the surface of the geotextile, and the lower end of the geotextile extends to the downstream of the downstream side dam; a modified dispersive soil material area is laid at the bottom of the dispersive soil material area; mattress drainage and prism drainage bodies are arranged at the bottom of the downstream side dam from inside to outside, and geotextile is paved at the upstream side and the bottom of the mattress drainage and prism drainage bodies.
The device also comprises a one-way check valve; the one-way check valves are provided with a plurality of water level change areas which are uniformly distributed on the geomembrane; the row spacing of the one-way check valves is (4-6) mx (4-6) m.
The geomembrane membrane material is made of a geosynthetic material with an anti-seepage function.
The geomembrane is a one-cloth one-film, two-cloth one-film or three-cloth two-film geomembrane which is made of HDPE material or PVC material.
The geotextile is made of a geosynthetic material with a reverse filtering function.
The unit area mass of the geotextile is not less than 300g/m2(ii) a The upper part of the geotextile extending to the downstream of the downstream side dam is covered with backfill soil.
The top elevation of the prism drainage body is 0.5m-1.5m higher than the highest water level of the downstream.
The modified dispersive soil material area is prepared by blending dispersive soil with quicklime or cement, wherein the weight ratio of the dispersive soil to the quicklime or cement is (10-1) to 1.
Has the advantages that:
(1) according to the invention, the bottom of the high-homogeneity dam is filled with modified dispersive soil, the upstream side dam of the high-homogeneity dam is provided with a geomembrane for retaining water, and the downstream side dam is provided with a geotextile for reverse filtration, so that the technical problem that only dispersive soil can be used for building the dam in a sand-rock material and block-rock material deficient area is solved, and the problem of permeation safety of the dispersive soil high-homogeneity dam under the action of a high water head is ensured.
(2) The bottom part of the invention is filled with the modified dispersive soil, and the requirement of compactness is improved, thereby reducing the sedimentation value of the dam top after the filling of the dispersive soil high-homogeneity dam is finished, avoiding the generation of cracks of the dispersive soil high-homogeneity dam body and ensuring the safety of the dispersive soil high-homogeneity dam.
(3) In the sand stone material and block stone material deficient area, the invention adopts the technical scheme that the construction of the high-homogeneity dam can be realized when only the dispersive soil material can fill the dam, and the invention has good social, economic and environmental ecological benefits.
The foregoing is a summary of the present invention, and the following is a detailed description of the preferred embodiments of the present invention in order to provide a more clear understanding of the technical features of the present invention.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic cross-sectional view of the present invention.
Fig. 2 is a schematic view of the upstream side dam structure.
In the figure: 1-upstream slope protection; 2-a protective layer; 3-geomembrane; 4-geotextile; 5-a dispersive soil region; 6-modified dispersive soil material area; 7-prism drainage body; 8-mattress drainage; 9-downstream slope protection; 10-backfilling; 11-one-way check valve; ds-downstream side dam; du — upstream side dam; and B, sticking and fixing the position between the valve body of the one-way check valve and the geomembrane.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
referring to fig. 1 and 2, a dispersive soil high-homogeneity dam comprises an upstream revetment 1, a protective layer 2, a geomembrane 3, a geotextile 4, a dispersive soil material area 5, a modified dispersive soil material area 6, a prism drainage body 7, a mattress drainage 8, a downstream revetment 9, an upstream side dam Du and a downstream side dam Ds; the dispersive soil material area 5 is a trapezoid filled with dispersive soil materials; a geomembrane 3 is laid on the surface of the upstream side dam Du, a protective layer 2 is laid on the upper surface of the geomembrane 3, and an upstream revetment 1 is laid on the upper surface of the protective layer 2; geotextile 4 is laid on the surface of the downstream side dam Ds, a downstream protection slope 9 is laid on the surface of the geotextile 4, and the lower end of the geotextile 4 extends to the downstream of the downstream side dam Ds; a modified dispersive soil area 6 is laid at the bottom of the dispersive soil area 5; a mattress drain 8 and a prism drain 7 are provided from the inside to the outside at the bottom of the downstream side dam Ds, and geotextiles 4 are laid on the upstream side and the bottom of the mattress drain 8 and the prism drain 7.
In actual use, the protective layer 2 is made of fine sand, fine gravel or other materials for protecting the geomembrane 3. The downstream slope protection 9 adopts dry masonry, cast-in-place concrete blocks or precast concrete blocks and is used for protecting a downstream dam slope from rainwater erosion and stabilizing the surface of the dam slope. The thickness of the geomembrane 3 adopted when the height of the high homogeneous dam is below 100m is 1mm-2 mm.
In the embodiment, the dispersive soil material is filled into the trapezoidal dispersive soil material area 5, the modified dispersive soil material area 6 is laid at the bottoms of the dispersive soil material areas 5 of the upstream side dam Du and the downstream side dam Ds, the geomembrane is arranged on the surface of the upstream side dam Du for water retaining, and the geotextile is arranged on the downstream side dam Ds for reverse filtration, so that the technical problem that only dispersive soil materials can be used for damming in a sand and stone material deficient area is solved, and the problem of permeation safety of the dispersive soil high-homogeneity dam under the action of a high water head is ensured. The filling of the modified dispersive soil is used, the requirement on compactness is improved, the dam top settlement value after the filling of the dispersive soil high-homogeneity dam is effectively reduced, the seepage damage of soil materials at the bottom of the high-homogeneity dam and the generation of dam body cracks are avoided, and the safety of the dispersive soil high-homogeneity dam is ensured.
The dispersible soil in this example was directly filled with the prior art dispersible soil.
The slope ratio of the upstream side dam Du in this embodiment is 1: m, wherein m is 2.5-3.5; the slope ratio of the downstream side dam Ds is 1: n, wherein n is 2-3, and the slope ratio of the upstream side dam Du is larger than that of the downstream side dam Ds.
In a specific application, the length of the geotextile 4 extending from the lower end to the downstream of the downstream side dam Ds is h2, and seepage calculation is performed according to the prior art to ensure that the seepage gradient at the escape point is smaller than the allowable gradient of the soil material at the escape point, as shown in fig. 1.
The invention aims at the situation that sand and stone materials and block stone materials are lacked in areas with sufficient soil material storage, and only dispersive soil can be used for filling and building as an anti-seepage body. The invention utilizes the upstream geomembrane to reduce the seepage head in the high-homogeneity dam body; reducing a saturation line in the dam by using a downstream drainage body; the downstream geotextile is utilized to protect the dispersive soil from being brought out, so that the infiltration damage is prevented; by utilizing the modified dispersive soil material, the permeation damage of the bottom of the dispersive soil high-homogeneity dam is prevented, and meanwhile, the sedimentation amount of the dispersive soil high-homogeneity dam after filling is reduced.
When sand and stone materials are purchased outside, the price is high, the engineering investment is high, and the economy is poor, by adopting the technical scheme of the invention, the construction of the dispersive soil high-homogeneity dam can be realized, and the invention has good social, economic and environmental ecological benefits.
Example two:
referring to a high-homogeneity dam of dispersive soil shown in fig. 1 and fig. 2, on the basis of the first embodiment: also comprises a one-way check valve 11; the one-way check valves 11 are provided with a plurality of water level change areas which are uniformly distributed on the geomembrane 3; the row spacing of the plurality of one-way check valves 11 is (4-6) mx (4-6) m.
In actual use, the one-way check valves 11 are arranged in the range of the water level variation area of the geomembrane 3, and the row spacing is about 5m multiplied by 5 m. During the sudden drop of the reservoir water level, the seepage water in the high-homogeneity dam of the dispersive soil can be discharged into the reservoir through the one-way check valve 11, and the geomembrane 3 is prevented from being jacked up and destabilized by the seepage water in the high-homogeneity dam of the dispersive soil. The one-way check valve 11 arranged on the geomembrane 3 only allows water seepage in the high-homogeneity dam of the dispersive soil to discharge the high-homogeneity dam of the dispersive soil after the upstream water level is reduced, and does not allow upstream reservoir water to enter the high-homogeneity dam of the dispersive soil.
In a specific application, the row spacing of the plurality of one-way check valves 11 is preferably 5m × 5 m.
Example three:
referring to a high-homogeneity dam of dispersive soil shown in fig. 1 and fig. 2, on the basis of the first embodiment: the geomembrane 3 is made of a geosynthetic material with an anti-seepage function.
Further, the geomembrane 3 is a one-cloth one-film, two-cloth one-film or three-cloth two-film geomembrane made of HDPE material or PVC material.
In actual use, the geomembrane 3 adopts the forms of two cloth, one film, three cloth, two films and the like, namely, the outer cloth wraps the inner film material, and each layer of the inner film material is separated by the cloth; the geomembrane 3 is made of HDPE material, PVC material or other novel materials so as to ensure the safety of the dam body.
In specific application, the geosynthetic material with the anti-seepage function can be used as the material of the geomembrane 3 according to requirements.
In specific application, the thickness of the geomembrane 3 is 1mm-2mm when the height of the high homogeneous dam is below 100 m.
Example four:
referring to a high-homogeneity dam of dispersive soil shown in fig. 1 and fig. 2, on the basis of the first embodiment: the geotextile 4 is made of a geosynthetic material with a reverse filtering function.
Further, the mass per unit area of the geotextile 4 is not less than 300g/m2(ii) a The upper portion of the geotextile 4 extending downstream of the downstream side dam Ds is covered with the backfill soil 10.
During the actual use, geotechnical cloth 4 adopts this technical scheme, can effectually prevent that downstream side dam Ds from taking place the infiltration and destroying, ensures dam safety.
Example five:
referring to a high-homogeneity dam of dispersive soil shown in fig. 1 and fig. 2, on the basis of the first embodiment: the top elevation of the prism drainage body 7 is 0.5m-1.5m higher than the highest water level of the downstream.
When the device is actually used, when the elevation of the top of the prism drainage body 7 is 0.5m-1.5m higher than the highest water level of the downstream, the leakage water flow is effectively prevented from being frozen in winter to block a seepage channel.
Example six:
referring to a high-homogeneity dam of dispersive soil shown in fig. 1, on the basis of the first embodiment: the modified dispersive soil material area 6 is formed by blending dispersive soil with quicklime or cement, wherein the proportion of the dispersive soil to the quicklime or the cement is (10-1): 1.
In actual use, the modified dispersive soil material area 6 can prevent the soil material at the bottom of the dispersive soil high-homogeneity dam from being damaged by permeation, and after the compaction degree of the modified dispersive soil material area 6 is improved, the settlement amount at the top of the dam can be reduced, and the cracks of the dispersive soil high-homogeneity dam can be reduced.
The proportion of the dispersible soil and the quicklime or the cement can be adjusted according to the actual condition of the strong and weak dispersibility of the soil.
Example ten:
as shown in fig. 1, the high-homogeneity dam of dispersive soil has a dam height H of more than 70m, and a high-homogeneity dam body filled with the dispersive soil 5 has a trapezoidal shape, and an upstream portion and a downstream portion of the high-homogeneity dam body are an upstream side dam Du and a downstream side dam Ds, respectively.
The slope ratio of the upstream side dam Du is 2.5, the slope ratio of the downstream side dam Ds is 2, and the upstream slope protection 1 and the protective layer 2 are provided on the surface of the upstream side dam Du from top to bottom.
As the engineering quantity is not large, the protective layer 2 can adopt outsourced sand and sand gravel materials.
The upstream slope protection 1 adopts cast-in-place concrete or precast concrete blocks, and does not need to be built with dry stones due to the shortage of stones.
As shown in fig. 2, the dispersible soil region 5 and the modified dispersible soil region 6 of the upstream side dam Du are provided with a geomembrane 3 on the upstream side, and a protective layer 2 and an upstream revetment 1 are provided upstream of the geomembrane 3, that is, the protective layer 2 and the upstream revetment 1 are provided on the outer surface of the geomembrane 3.
The geomembrane 3 adopts a geosynthetic material form of two cloth one film, three cloth two films and the like; the geomembrane 3 is made of HDPE (high-density polyethylene) material or PVC (polyvinyl chloride) material, and the thickness of the geomembrane is determined according to the height of the high-homogeneity dam body. A dam with the height of less than 100m is 1mm-2 mm.
The range of the water level variation area of the geomembrane 3 is provided with one-way check valves 11 with the row spacing of about 5m multiplied by 5 m. During the sudden drop of the reservoir water level, the seepage water in the high-homogeneity dam of the dispersive soil can be discharged into the reservoir through the one-way check valve 11, and the geomembrane 3 is prevented from being jacked up and destabilized by the seepage water in the high-homogeneity dam of the dispersive soil.
The geotextile 4 is made of geosynthetic material, and has a mass per unit area of not less than 300g/m to meet the relevant standard requirements of geosynthetic material application technology2. The extension length h2 of the geotextile 4 at the downstream of the dispersive soil high-homogeneity dam needs to be determined according to seepage calculation so as to ensure that the infiltration slope drop of the escape point is smaller than the allowable slope drop of the soil material at the escape point. The upper part of the geotextile 4 at the downstream of the prism drainage body 7 is covered with backfill 10.
The modified dispersive soil material area 6 adopts the existing dispersive soil in the engineering area to be mixed with quicklime or cement to eliminate the dispersibility. After modification and compaction, the shear strength and the compression modulus of the modified dispersive soil material area 6 are improved, the settlement value of the dam top after the completion of filling of the dispersive soil high-homogeneity dam can be reduced, and cracks of the dispersive soil high-homogeneity dam are reduced and avoided. The height H1 of the modified dispersive soil material area 6 can be determined by calculation according to the sedimentation of the dispersive soil high-homogeneity dam by utilizing the prior art, so as to ensure that the sedimentation value of the top of the dam is not more than 0.01H after the filling of the dispersive soil high-homogeneity dam is finished.
The top elevation of the prism drainage body 7 is 1m higher than the highest water level of the downstream, and the prism drainage body is filled with block stone materials with good water permeability; the mattress type drainage body 8 extends into the high-homogeneity dam body, and the height and the length of the high-homogeneity dam body are determined through seepage calculation, so that the purpose of reducing a seepage line of the high-homogeneity dam of the dispersive soil is achieved.
According to the dispersive soil high-homogeneity dam, the bottom of the high-homogeneity dam is filled with modified dispersive soil materials, the upstream side dam of the dispersive soil high-homogeneity dam is provided with a geomembrane for retaining water, and the downstream side of the dispersive soil high-homogeneity dam is provided with geotextile for reverse filtration, so that the technical problem that only the dispersive soil materials can be used for damming in a sand and stone block lack area is solved, and the problem of permeation safety of the dispersive soil high-homogeneity dam under the action of a high water head is ensured; the bottom part of the dispersive-soil high-homogeneity dam is filled with the modified dispersive soil, the requirement on compaction degree is improved, and the settlement value of the dam top after the filling of the dispersive-soil high-homogeneity dam is finished can be reduced, so that the generation of cracks of the dispersive-soil high-homogeneity dam is avoided, and the safety of the dispersive-soil high-homogeneity dam is ensured. In the sand stone material and block stone material deficient area, when only dispersive earth material can be used for filling the dam, the high-homogeneity dam body structure has good social, economic and environmental ecological benefits.
Example eleven:
as shown in fig. 1, in the upstream portion and the downstream portion of the high homogeneity dam body, the slope ratio of the upstream side dam Du is 1: m is 1: 3.5, the downstream side dam Ds is slightly steeper than the upstream side dam Du, and the gradient ratio thereof is 1: n is 1: 3.
as shown in fig. 2, according to the conditions of the upstream side dam Du and the downstream side dam Ds, the valve body of the one-way check valve 11 is fixedly bonded to the geomembrane 3 at the position B, the downstream side of the one-way check valve 11 (the side extending into the dispersible soil material area 5 and the modified dispersible soil material area 6) is covered with the geotextile 4, and the geotextile 4 is sewn with the cloth below the geomembrane 2 at the position a.
The construction of the dispersive soil high-homogeneity dam is carried out in the same manner as in the embodiment, and the detailed description is omitted, wherein, for the structure of the dispersive soil high-homogeneity dam, the settlement, deformation, stress, dam slope stability and the like of the dispersive soil high-homogeneity dam must be checked, the requirements of the related specifications of the rolling type earth-rock dam are met, and meanwhile, the penetration stability of each material area of the dispersive soil high-homogeneity dam is checked.
In the case of no conflict, a person skilled in the art may combine the related technical features in the above examples according to actual situations to achieve corresponding technical effects, and details of various combining situations are not described herein.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
Claims (1)
1. A high homogeneity dam of dispersion soil which characterized in that: the soil-water-resistant composite material comprises an upstream protection slope (1), a protective layer (2), a geomembrane (3), a geotextile (4), a dispersible soil material area (5), a modified dispersible soil material area (6), a prism drainage body (7), mattress drainage (8), a downstream protection slope (9), an upstream side dam (Du) and a downstream side dam (Ds); the dispersive soil material area (5) is a trapezoid filled by dispersive soil materials; a geomembrane (3) is laid on the surface of the upstream side dam (Du), a protective layer (2) is laid on the upper surface of the geomembrane (3), and an upstream revetment (1) is laid on the upper surface of the protective layer (2); the surface of the downstream side dam (Ds) is paved with geotextile (4), the surface of the geotextile (4) is paved with a downstream protective slope (9), and the lower end of the geotextile (4) extends to the downstream of the downstream side dam; a modified dispersive soil area (6) is laid at the bottom of the dispersive soil area (5); mattress drainage (8) and a prism drainage body (7) are arranged at the bottom of the downstream side dam (Ds) from inside to outside, and geotextiles (4) are laid at the upstream side and the bottom of the mattress drainage (8) and the prism drainage body (7);
the geomembrane (3) is made of a geometic synthetic material with an anti-seepage function;
the device also comprises a one-way check valve (11); the one-way check valves (11) are provided with a plurality of water level change areas which are uniformly distributed on the geomembrane (3); the row spacing of the one-way check valves (11) is (4-6) mx (4-6) m;
the geomembrane (3) adopts a one-cloth one-film, two-cloth one-film or three-cloth two-film geomembrane which is made of HDPE material or PVC material;
the geotextile (4) is made of a geosynthetic material with a reverse filtration function;
the mass per unit area of the geotextile (4) is not less than 300g/m2(ii) a The upper part of the geotextile (4) extending to the downstream of the downstream side dam (Ds) is covered with backfill soil (10);
the top elevation of the prism drainage body (7) is 0.5m-1.5m higher than the highest water level of the downstream;
the modified dispersive soil material area (6) is formed by blending dispersive soil with quicklime or cement, wherein the weight ratio of the dispersive soil to the quicklime or cement is (10-1): 1.
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| CN114508078B (en) * | 2022-01-28 | 2023-03-24 | 长江勘测规划设计研究有限责任公司 | Construction method for constructing homogeneous sand dam by adopting natural sedimentation graded poor fine sand on site |
| CN116065539A (en) * | 2023-02-14 | 2023-05-05 | 中国电建集团西北勘测设计研究院有限公司 | Dam body drainage structure of hundred-meter-level homogeneous soil dam high downstream water level |
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| CN205000298U (en) * | 2015-10-10 | 2016-01-27 | 中国电建集团成都勘测设计研究院有限公司 | Embankment dam dam facing slope protection structure |
| CN108193648A (en) * | 2018-03-19 | 2018-06-22 | 黄河勘测规划设计有限公司 | Plasticity panel homogeneous dam |
| CN108193649A (en) * | 2018-03-19 | 2018-06-22 | 黄河勘测规划设计有限公司 | Core-wall homogeneous dam |
| CN210857127U (en) * | 2019-09-12 | 2020-06-26 | 中国电建集团中南勘测设计研究院有限公司 | Asphalt concrete core rock-fill dam |
| CN110847124A (en) * | 2019-11-19 | 2020-02-28 | 中电建十一局工程有限公司 | Concrete panel rock-fill dam with multiple anti-seepage structures and construction method thereof |
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