Suspended plastic film anti-seepage structure of flood bank

Abstract

The utility model discloses a flood bank suspension type plastic film anti-seepage structure which comprises a bank body, a suspension type anti-seepage plastic film unit is laid in the bank body, the suspension type anti-seepage plastic film unit is connected with a water filtering and draining unit at a slope toe of the backwater side of the bank body, and the water filtering and draining unit is arranged below a bank foundation of the slope toe of the backwater side of the bank body. According to the suspended type plastic film anti-seepage structure of the flood bank, the suspended type anti-seepage plastic film is arranged in the bank body of the flood bank, so that the seepage flow direction in the bank is changed, the seepage path is effectively prolonged, the seepage gradient and the seepage pressure are reduced, and the seepage escape point height, the escape gradient and the like of the slope on the backwater side of the flood bank are greatly reduced; and seepage stability and engineering safety of the flood bank are ensured. The suspension type plastic film anti-seepage structure of the flood bank is simple in anti-seepage structure, small in engineering investment, easy to construct, convenient to manage and maintain in the later period and low in cost.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of flood control embankment seepage prevention, and particularly relates to a flood control embankment suspension type plastic film seepage prevention structure. BACKGROUND

[0002] During flood of river, seepage of flood control embankment on both banks is stable, and seepage damage does not occur, which is the primary condition for normal operation of embankment and guarantee of flood control safety on both banks of river. The existing seepage prevention structures of flood control embankment mainly have two kinds: one is to lay plastic film or clay covering on the water side of embankment to reduce the height of wetting line, lengthen seepage path, reduce seepage gradient and leakage, and reduce the height of seepage out of the backwater side of flood control embankment, and reduce the outflow gradient; the other is to set clay core wall in the middle of flood control embankment or on the upstream side, and the bottom elevation of clay core wall is located below a certain depth of relatively impermeable layer of embankment foundation to realize seepage interception of embankment, reduce the height of wetting line, reduce seepage gradient and leakage, and guarantee seepage stability of flood control embankment. The above two kinds of seepage prevention structures can play a good seepage prevention role when the height of flood control embankment is less than 10 m, the permeability coefficient of embankment material is less than 1*10 -3 cm / s, and the thickness of water permeable layer of embankment foundation is less than 5 m. However, when the water permeability of embankment material of flood control embankment is strong, and the depth of water permeable layer of embankment foundation is large, even if the height of embankment is not large, the above two kinds of seepage prevention structures are difficult to achieve satisfactory seepage prevention effect, and often cause the following situations: long length of covering on the water side of flood control embankment, large earthwork excavation for construction of base seepage prevention core wall, high seepage out of the backwater side of flood control embankment, unsatisfied stable requirement of outflow gradient, and complex structure of slope drainage facilities. Not only is the engineering investment cost high, but also daily maintenance and management are inconvenient, and there are many engineering operation risks. CONTENT OF UTILITY MODEL

[0003] The utility model aims at providing a flood control embankment suspension type plastic film seepage prevention structure, and solves the problems of high seepage out of the backwater side of embankment, large leakage, and unsatisfied stable requirement of outflow gradient of the existing seepage prevention structure of flood control embankment.

[0004] The technical scheme adopted by the utility model is a flood control embankment suspension type plastic film seepage prevention structure, which comprises an embankment, and a suspension type seepage prevention plastic film unit is laid in the embankment; a filter and drainage unit is connected to the backwater side slope foot of the embankment, and the filter and drainage unit is arranged below the embankment foundation of the backwater side slope foot.

[0005] The utility model has the following characteristics:

[0006] The suspension type plastic film seepage prevention unit comprises an upper section suspension type plastic film seepage prevention unit, an intermediate section plastic film seepage prevention unit connected to one end of the upper section suspension type plastic film seepage prevention unit, a lower section suspension type plastic film seepage prevention unit connected to the other end of the intermediate section plastic film seepage prevention unit, and a filter geotextile connected to the lower section suspension type plastic film seepage prevention unit.

[0007] The upper section suspension type plastic film seepage prevention unit is vertically laid in the interior of the dam body, the top elevation of the upper section suspension type plastic film seepage prevention unit is higher than the design elevation of the flood control water level, and the bottom elevation of the upper section suspension type plastic film seepage prevention unit is lower than the ground.

[0008] The intermediate section plastic film seepage prevention unit is transversely and obliquely laid in the interior of the dam body on the backwater side along the water flow direction.

[0009] The lower section suspension type plastic film seepage prevention unit is vertically laid in the interior of the dam body on the backwater side, the top elevation of the lower section suspension type plastic film seepage prevention unit is lower than the ground, and the bottom of the lower section suspension type plastic film seepage prevention unit extends into the foundation.

[0010] The upper section suspension type plastic film seepage prevention unit, the intermediate section plastic film seepage prevention unit and the lower section suspension type plastic film seepage prevention unit are connected through plastic film adhesive sections along the longitudinal direction of the flood control dam, the length of the connection is not less than 0.5 m, and the upper section suspension type plastic film seepage prevention unit, the intermediate section plastic film seepage prevention unit and the lower section suspension type plastic film seepage prevention unit form an integral structure.

[0011] One end of the filter geotextile close to the lower section suspension type plastic film seepage prevention unit is connected to the lower section suspension type plastic film seepage prevention unit through a film cloth adhesive section along the longitudinal direction of the flood control dam, the length of the connection is not less than 0.5 m, and the horizontal drainage layer is arranged above the horizontal section of the filter geotextile.

[0012] The drainage pebble ditch is laid at the toe of the dam body on the backwater side, and the seepage water is discharged to the ground through the horizontal drainage layer and the drainage pebble ditch.

[0013] The upper section suspension type plastic film seepage prevention unit, the intermediate section plastic film seepage prevention unit and the lower section suspension type plastic film seepage prevention unit are all made of one of the following: a geomembrane seepage prevention plastic film, a one cloth one film seepage prevention plastic film and a two cloth one film seepage prevention plastic film.

[0014] The utility model discloses the beneficial effect is:

[0015] The utility model discloses a plastic film seepage prevention structure of suspension type of flood control dam, set up suspension type plastic film seepage prevention unit in the dam body of flood control dam, changed the seepage flow direction in dam, effectively prolonged the seepage diameter, reduced the seepage ratio drop and seepage pressure, greatly reduced the seepage flow escape point height and escape ratio drop of flood control dam backwater side slope, guaranteed the seepage flow stability and engineering safety of flood control dam. DRAWINGS

[0016] Figure 1 is the structure diagram of the flood control embankment suspension type plastic film seepage prevention structure of the utility model;

[0017] Figure 2 is the A-A section schematic diagram of the utility model;

[0018] Figure 3 is the B-B section schematic diagram of the utility model.

[0019] In the figure, 1. embankment body, 2. upper section suspension type seepage prevention plastic film, 3. middle section seepage prevention plastic film, 4. lower section suspension type seepage prevention plastic film, 5. water filtering geotextile, 6. drainage pebble ditch, 7. film cloth bonding section, 8. horizontal drainage layer, 9. plastic film bonding section. DETAILED DESCRIPTION

[0020] The utility model will be described in detail below in combination with the drawings and specific embodiments.

[0021] The flood control embankment suspension type plastic film seepage prevention structure provided by the utility model, like Figures 1-3The illustrated embankment comprises an embankment body 1 filled with cohesive or sandy soil, a suspended impermeable plastic membrane unit laid in the embankment body 1, a filter drainage unit connected to the suspended impermeable plastic membrane unit at the toe of the embankment body 1 on the land side, and the filter drainage unit being arranged below the embankment foundation at the toe of the embankment body 1 on the land side. The suspended impermeable plastic membrane unit comprises an upper suspended impermeable plastic membrane 2, an intermediate impermeable plastic membrane 3 connected to one end of the upper suspended impermeable plastic membrane 2, a lower suspended impermeable plastic membrane 4 connected to the other end of the intermediate impermeable plastic membrane 3, and a filter geotextile 5 connected to the lower suspended impermeable plastic membrane 4. The filter drainage unit comprises a horizontal drainage layer 8 arranged above the filter geotextile 5, and a drainage pebble ditch 6 laid on the filter geotextile 5 at the toe of the embankment body 1. The drainage pebble ditch 6 and the horizontal drainage layer 8 have good water permeability, so as to facilitate the smooth discharge and dissipation of groundwater. The lower suspended impermeable plastic membrane 4 is kept at a certain horizontal distance from the slope angle of the embankment on the land side. The main function of the upper suspended impermeable plastic membrane 2 is to intercept seepage, change the horizontal seepage direction to downward direction, effectively reduce the height of the embankment saturation line, prolong the seepage path, reduce the seepage gradient and seepage pressure. The main function of the intermediate impermeable plastic membrane 3 is to prolong the seepage path, and to realize the stable reduction of the embankment seepage saturation line along the intermediate impermeable plastic membrane 3, and to reduce the embankment seepage saturation line to below the ground elevation near the land side of the embankment. The main function of the lower suspended impermeable plastic membrane 4 and the horizontal drainage layer 8 is to change the horizontal seepage direction to vertical downward direction through the seepage interception of the lower suspended impermeable plastic membrane 4, further prolong the seepage path, reduce the seepage gradient, further reduce the embankment seepage saturation line, reduce the seepage pressure, and ensure the stability of the seepage outflow area on the land side of the embankment, and the smooth discharge and dissipation of the seepage through the filter geotextile, the horizontal drainage layer 8 and the drainage pebble ditch 6. The upper suspended impermeable plastic membrane 2 is vertically laid in the embankment body 1, the top elevation of the upper suspended impermeable plastic membrane 2 is higher than the design elevation of the flood control water level, the bottom elevation of the upper suspended impermeable plastic membrane 2 is lower than the ground, and the laying depth does not reach the embankment foundation bedrock or relatively impermeable layer. The intermediate impermeable plastic membrane 3 is horizontally and obliquely laid in the embankment body 1 on the land side, so as to facilitate the smooth discharge and dissipation of the groundwater in the embankment above the plastic membrane. The lower suspended impermeable plastic membrane 4 is vertically laid in the embankment body 1 on the land side, the top elevation of the lower suspended impermeable plastic membrane 4 is lower than the ground, and the bottom of the lower suspended impermeable plastic membrane 4 extends into the foundation bed. The upper suspended impermeable plastic membrane 2, the intermediate impermeable plastic membrane 3 and the lower suspended impermeable plastic membrane 4 are connected by plastic membrane adhesive sections 9 along the longitudinal direction of the embankment, and the length of the overlap is not less than 0.5 m. The upper suspended impermeable plastic membrane 2, the intermediate impermeable plastic membrane 3 and the lower suspended impermeable plastic membrane 4 form an integrated structure, which is bonded by special adhesive, so as to ensure the structural integrity of the impermeable plastic membrane and the filter geotextile. One end of the filter geotextile 5 close to the lower suspended impermeable plastic membrane 4 is connected to the lower suspended impermeable plastic membrane 4 by a membrane cloth adhesive section 7 along the longitudinal direction of the embankment, and the length of the overlap is not less than 0.5m, the horizontal drainage layer 8 is arranged above the horizontal section of the water filtering geotextile 5; the drainage pebble ditch 6 is laid at the toe of the backwater side slope of the embankment 1, and water seepage is discharged to the ground through the horizontal drainage layer 8 and the drainage pebble ditch 6; the upper section of the suspended anti-seepage plastic film 2, the middle section of the anti-seepage plastic film 3 and the lower section of the suspended anti-seepage plastic film 4 are all made of the geotextile anti-seepage plastic film, one of the one-geotextile-one-film anti-seepage plastic film and the two-geotextile-one-film anti-seepage plastic film, and the laying is required to meet the requirements of the construction specification to ensure a certain slackness to prevent the plastic film from being torn and damaged due to the natural consolidation settlement of the embankment.

[0022] The working principle of the suspended anti-seepage plastic film structure of the flood control embankment provided by the utility model is as follows: during the flood of a river, the seepage direction of the embankment 1 is the positive seepage from the river to the outside of the embankment, and the internal seepage flow direction of the embankment 1 is the embankment 1 on the water side → the upper section of the suspended anti-seepage plastic film 2 → the middle section of the anti-seepage plastic film 3 → the lower section of the suspended anti-seepage plastic film 4 → the water filtering geotextile 5 → the horizontal drainage layer 8 → the drainage pebble ditch 6, and finally discharged to the embankment 1; during the flood of a river and the groundwater recharge of the river, the internal seepage flow direction of the embankment 1 is the reverse seepage from the outside of the flood control embankment to the inside of the river, and the seepage mainly flows to the river channel through the water permeable layer of the embankment foundation, so that the positive and reverse bidirectional seepage can be realized, and the original seepage channel is not blocked.

[0023] Embodiment 1

[0024] The suspended anti-seepage plastic film structure of the flood control embankment provided by the embodiment, as shown in Figures 1-3 , comprises an embankment 1, the suspended anti-seepage plastic film unit is laid in the embankment 1, the suspended anti-seepage plastic film unit is connected with the filter drainage unit at the toe of the backwater side slope of the embankment 1, and the filter drainage unit is arranged below the embankment foundation at the toe of the backwater side slope of the embankment 1.

[0025] Embodiment 2

[0026] The suspended anti-seepage plastic film structure of the flood control embankment provided by the embodiment, as shown in Figures 1-3 , comprises an embankment 1, the suspended anti-seepage plastic film unit is laid in the embankment 1, the suspended anti-seepage plastic film unit is connected with the filter drainage unit at the toe of the backwater side slope of the embankment 1, and the filter drainage unit is arranged below the embankment foundation at the toe of the backwater side slope of the embankment 1; the suspended anti-seepage plastic film unit comprises the upper section of the suspended anti-seepage plastic film 2, one end of the upper section of the suspended anti-seepage plastic film 2 is connected with the middle section of the anti-seepage plastic film 3, the other end of the middle section of the anti-seepage plastic film 3 is connected with the lower section of the suspended anti-seepage plastic film 4, the lower section of the suspended anti-seepage plastic film 4 is connected with the water filtering geotextile 5, the filter drainage unit comprises the horizontal drainage layer 8, the horizontal drainage layer 8 is arranged on the upper part of the water filtering geotextile 5, and the drainage pebble ditch 6 is laid on the water filtering geotextile 5 at the slope toe of the embankment 1.

[0027] Embodiment 3

[0028] The suspended anti-seepage plastic film structure of the flood control embankment provided by the embodiment, as shown in Figures 1-3As shown, the structure includes a dike body 1, within which a suspended geomembrane unit is laid. A drainage unit is connected to the toe of the slope on the backwater side of the dike body 1, and the drainage unit is located below the dike foundation on the backwater side of the slope. The suspended geomembrane unit includes an upper suspended geomembrane 2, one end of which is connected to a middle section geomembrane 3, and the other end of the middle section geomembrane 3 is connected to a lower suspended geomembrane 4. The lower suspended geomembrane 4 is connected to a filter geotextile 5. The drainage unit includes a horizontal drainage layer 8, located on top of the filter geotextile 5, extending to the toe of the slope of the dike body 1. A drainage pebble ditch 6 is laid on the filter geotextile 5. The upper suspended geomembrane 2 is laid vertically inside the dike body 1, with the top elevation of the upper suspended geomembrane 2 higher than the design flood control level and the bottom elevation of the upper suspended geomembrane 2 lower than the ground level.

[0029] Example 4

[0030] The suspended plastic membrane seepage prevention structure for flood control dikes proposed in this embodiment, such as Figures 1-3 As shown, the structure includes a dike body 1, within which a suspended geomembrane unit is laid. A drainage unit is connected to the suspended geomembrane unit at the toe of the slope on the backwater side of the dike body 1. The drainage unit is located below the dike foundation on the backwater side of the slope. The suspended geomembrane unit includes an upper suspended geomembrane 2, one end of which is connected to a middle section geomembrane 3. The other end of the middle section geomembrane 3 is connected to a lower suspended geomembrane 4, which is connected to a filter soil. The geotextile 5 and the drainage unit include a horizontal drainage layer 8, which is located on the upper part of the geotextile 5 and extends to the toe of the slope of the embankment 1. A drainage pebble ditch 6 is laid on the geotextile 5. The upper section of the suspended impermeable plastic membrane 2 is laid vertically inside the embankment 1. The top elevation of the upper section of the suspended impermeable plastic membrane 2 is higher than the design elevation of the flood control level, and the bottom elevation of the upper section of the suspended impermeable plastic membrane 2 is lower than the ground. The middle section of the impermeable plastic membrane 3 is laid horizontally and inclined along the direction of water flow inside the backwater side of the embankment 1.

[0031] Example 5

[0032] The suspended plastic membrane seepage prevention structure for flood control dikes proposed in this embodiment, such as Figures 1-3As shown, the structure includes a dike body 1, within which a suspended geomembrane unit is laid. A drainage unit is connected to the suspended geomembrane unit at the toe of the slope on the backwater side of the dike body 1, and the drainage unit is located below the dike foundation on the backwater side of the slope. The suspended geomembrane unit includes an upper suspended geomembrane 2, one end of which is connected to a middle section geomembrane 3, and the other end of the middle section geomembrane 3 is connected to a lower suspended geomembrane 4. The lower suspended geomembrane 4 is connected to a filter geotextile 5. The drainage unit includes a horizontal drainage layer 8, which is located on top of the filter geotextile. 5. At the top, the horizontal drainage layer 8 extends to the toe of the slope of the embankment 1, and a drainage pebble ditch 6 is laid on the filter geotextile 5; the upper section of the suspended impermeable plastic membrane 2 is laid vertically inside the embankment 1, the top elevation of the upper section of the suspended impermeable plastic membrane 2 is higher than the design elevation of the flood control level, and the bottom elevation of the upper section of the suspended impermeable plastic membrane 2 is lower than the ground; the middle section of the impermeable plastic membrane 3 is laid horizontally inclined along the direction of water flow inside the backwater side of the embankment 1; the lower section of the suspended impermeable plastic membrane 4 is laid vertically inside the backwater side of the embankment 1, the top elevation of the lower section of the suspended impermeable plastic membrane 4 is lower than the ground, and the bottom of the lower section of the suspended impermeable plastic membrane 4 extends into the foundation.

[0033] Example 6

[0034] The suspended plastic membrane seepage prevention structure for flood control dikes proposed in this embodiment, such as Figures 1-3 As shown, the structure includes a dike body 1, within which a suspended impermeable plastic membrane unit is laid. This suspended impermeable plastic membrane unit is connected to a drainage unit at the toe of the slope on the backwater side of the dike body 1. The drainage unit is located below the dike foundation on the backwater side of the slope. The suspended impermeable plastic membrane unit includes an upper section of suspended impermeable plastic membrane 2, one end of which is connected to a middle section of suspended impermeable plastic membrane 3. The other end of the middle section of suspended impermeable plastic membrane 3 is connected to a lower section of suspended impermeable plastic membrane 4. The lower section of suspended impermeable plastic membrane 4 is connected to a filter geotextile 5. The drainage unit includes a horizontal drainage layer 8, located on top of the filter geotextile 5. The horizontal drainage layer 8 extends to the toe of the slope of the dike body 1, where a drainage pebble ditch 6 is laid on the filter geotextile 5. The upper section of suspended impermeable plastic membrane 2 is laid vertically on... Inside the dike body 1, the top elevation of the upper section of the suspended geomembrane 2 is higher than the design elevation of the flood control level, while the bottom elevation of the upper section of the suspended geomembrane 2 is lower than the ground level. The middle section of the geomembrane 3 is laid horizontally and inclined along the direction of water flow inside the backwater side of the dike body 1. The lower section of the suspended geomembrane 4 is laid vertically inside the backwater side of the dike body 1, with the top elevation of the lower section of the suspended geomembrane 4 lower than the ground level and the bottom of the lower section of the suspended geomembrane 4 extending into the foundation. The upper section of the suspended geomembrane 2, the middle section of the suspended geomembrane 3, and the lower section of the suspended geomembrane 4 are all connected by overlapping sections 9 along the longitudinal direction of the flood control dike, with an overlap length of not less than 0.5m. The upper section of the suspended geomembrane 2, the middle section of the suspended geomembrane 3, and the lower section of the suspended geomembrane 4 form an integral structure.

[0035] Example 7

[0036] The suspended plastic membrane seepage prevention structure for flood control dikes proposed in this embodiment, such as Figures 1-3 As shown, the structure includes a dike body 1, within which a suspended geomembrane unit is laid. A drainage unit is connected to the toe of the slope on the backwater side of the dike body 1, located below the dike foundation on the backwater side. The suspended geomembrane unit includes an upper section of suspended geomembrane 2, with one end connected to a middle section of geomembrane 3, and the other end connected to a lower section of suspended geomembrane 4. A filter geotextile 5 is connected to the lower section of suspended geomembrane 4. The drainage unit includes a horizontal drainage layer 8, located on top of the filter geotextile 5, extending to the toe of the slope of the dike body 1. A drainage pebble ditch 6 is laid on the filter geotextile 5. The upper section of suspended geomembrane 2 is vertically laid inside the dike body 1, with its top elevation higher than the flood control design elevation. The bottom of the upper section of suspended geomembrane 2... The elevation is lower than the ground level; the middle section of the impermeable plastic membrane 3 is laid horizontally inclined along the direction of water flow inside the backwater side of the dike body 1; the lower section of the suspended impermeable plastic membrane 4 is laid vertically inside the backwater side of the dike body 1, the top elevation of the lower section of the suspended impermeable plastic membrane 4 is lower than the ground level, and the bottom of the lower section of the suspended impermeable plastic membrane 4 extends into the foundation; the upper section of the suspended impermeable plastic membrane 2, the middle section of the impermeable plastic membrane 3 and the lower section of the suspended impermeable plastic membrane 4 are all connected by the plastic membrane bonding section 9 along the longitudinal direction of the flood control dike, and the overlap length is not less than 0.5m. The upper section of the suspended impermeable plastic membrane 2, the middle section of the impermeable plastic membrane 3 and the lower section of the suspended impermeable plastic membrane 4 form an integral structure; the end of the filter geotextile 5 near the lower section of the suspended impermeable plastic membrane 4 is connected to the lower section of the suspended impermeable plastic membrane 4 along the longitudinal direction of the flood control dike by the membrane bonding section 7, and the overlap length is not less than 0.5m. The horizontal drainage layer 8 is set above the horizontal section of the filter geotextile 5.

[0037] Example 8

[0038] The suspended plastic membrane seepage prevention structure for flood control dikes proposed in this embodiment, such as Figures 1-3The application discloses a kind of flood control embankment and its construction method, as shown, including dike body 1, dike body 1 is laid with suspension type anti-seepage plastic film unit, suspension type anti-seepage plastic film unit is connected with filter drainage unit at the backwater side slope foot of dike body 1, filter drainage unit is arranged in the backwater side slope foot dike foundation below dike body 1;Suspension type anti-seepage plastic film unit includes upper section suspension type anti-seepage plastic film 2, upper section suspension type anti-seepage plastic film 2 one end is connected with intermediate section anti-seepage plastic film 3, intermediate section anti-seepage plastic film 3 other end is connected with lower section suspension type anti-seepage plastic film 4, lower section suspension type anti-seepage plastic film 4 is connected with filter water geotextile 5, filter drainage unit includes horizontal drainage layer 8, horizontal drainage layer 8 is arranged on the upper portion of filter water geotextile 5, horizontal drainage layer 8 extends to the slope foot of dike body 1 and is laid with drainage pebble ditch 6 on filter water geotextile 5;Upper section suspension type anti-seepage plastic film 2 is vertically laid in the inside of dike body 1, the elevation of upper section suspension type anti-seepage plastic film 2 top is higher than the design elevation of flood control water level, the elevation of upper section suspension type anti-seepage plastic film 2 bottom is lower than ground;Intermediate section anti-seepage plastic film 3 is transversely inclined and laid in the inside of the backwater side of dike body 1 along water flow direction;Lower section suspension type anti-seepage plastic film 4 is vertically laid in the inside of the backwater side of dike body 1, the elevation of lower section suspension type anti-seepage plastic film 4 top is lower than ground, and the bottom of lower section suspension type anti-seepage plastic film 4 extends into foundation;The length of the overlap connection between upper section suspension type anti-seepage plastic film 2, intermediate section anti-seepage plastic film 3 and lower section suspension type anti-seepage plastic film 4 along the longitudinal direction of flood control embankment is not less than 0.5 m, and upper section suspension type anti-seepage plastic film 2, intermediate section anti-seepage plastic film 3 and lower section suspension type anti-seepage plastic film 4 form an overall structure;The length of the overlap connection between the one end of filter water geotextile 5 close to lower section suspension type anti-seepage plastic film 4 and lower section suspension type anti-seepage plastic film 4 along the longitudinal direction of flood control embankment is not less than 0.5 m, and horizontal drainage layer 8 is arranged above the horizontal section of filter water geotextile 5;Drainage pebble ditch 6 is laid in the backwater side slope foot of dike body 1, and water seeps out of ground through horizontal drainage layer 8 and drainage pebble ditch 6;Upper section suspension type anti-seepage plastic film 2, intermediate section anti-seepage plastic film 3 and lower section suspension type anti-seepage plastic film 4 all adopt one of earthwork membrane anti-seepage plastic film, one cloth one membrane anti-seepage plastic film and two cloth one membrane anti-seepage plastic film.

Claims

1. A suspended plastic membrane seepage-proof structure for flood control dikes, characterized in that, The embankment includes a levee body (1), in which a suspended impermeable plastic membrane unit is laid. The suspended impermeable plastic membrane unit is connected to a drainage unit at the back slope toe of the levee body (1). The drainage unit is located below the levee foundation at the back slope toe of the levee body (1).

2. The suspended plastic membrane seepage-proof structure for flood control dikes according to claim 1, characterized in that, The suspended impermeable plastic membrane unit includes an upper suspended impermeable plastic membrane (2), one end of which is connected to a middle section impermeable plastic membrane (3), the other end of which is connected to a lower suspended impermeable plastic membrane (4), and the lower suspended impermeable plastic membrane (4) is connected to a filter geotextile (5). The drainage unit includes a horizontal drainage layer (8), which is located on the upper part of the filter geotextile (5). The horizontal drainage layer (8) extends to the toe of the embankment (1) and a drainage pebble ditch (6) is laid on the filter geotextile (5).

3. The suspended plastic membrane seepage-proof structure for flood control dikes according to claim 2, characterized in that, The upper section of the suspended impermeable plastic membrane (2) is laid vertically inside the embankment (1). The top elevation of the upper section of the suspended impermeable plastic membrane (2) is higher than the design elevation of the flood control level, and the bottom elevation of the upper section of the suspended impermeable plastic membrane (2) is lower than the ground.

4. The suspended plastic membrane seepage-proof structure for flood control dikes according to claim 2, characterized in that, The intermediate section of the impermeable plastic membrane (3) is laid horizontally and inclined along the direction of water flow inside the back side of the embankment (1).

5. The suspended plastic membrane seepage-proof structure for flood control dikes according to claim 2, characterized in that, The lower section of the suspended impermeable plastic membrane (4) is laid vertically inside the backwater side of the embankment (1). The top elevation of the lower section of the suspended impermeable plastic membrane (4) is lower than the ground level, and the bottom of the lower section of the suspended impermeable plastic membrane (4) extends into the foundation.

6. The suspended plastic membrane seepage-proof structure for flood control dikes according to claim 2, characterized in that, The upper section of suspended impermeable plastic membrane (2), the middle section of suspended plastic membrane (3) and the lower section of suspended plastic membrane (4) are all connected by plastic membrane bonding section (9) along the longitudinal direction of the flood control dike. The length of the overlap is not less than 0.5m. The upper section of suspended plastic membrane (2), the middle section of suspended plastic membrane (3) and the lower section of suspended plastic membrane (4) form an integral structure.

7. The suspended plastic membrane seepage-proof structure for flood control dikes according to claim 2, characterized in that, The end of the filter geotextile (5) near the lower section of the suspended impermeable plastic membrane (4) is connected to the lower section of the suspended impermeable plastic membrane (4) in the longitudinal direction of the flood control dike through the membrane bonding section (7). The length of the overlap is not less than 0.5m. The horizontal drainage layer (8) is located above the horizontal section of the filter geotextile (5).

8. The suspended plastic membrane seepage-proof structure for flood control dikes according to claim 2, characterized in that, The drainage pebble ditch (6) is laid on the back slope of the embankment (1), and seepage water is discharged to the ground through the horizontal drainage layer (8) and the drainage pebble ditch (6).

9. The suspended plastic membrane seepage-proof structure for flood control dikes according to claim 2, characterized in that, The upper suspended geomembrane (2), the middle geomembrane (3) and the lower suspended geomembrane (4) are all made of geomembrane geomembrane, one-layer geomembrane geomembrane and two-layer geomembrane geomembrane.

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