Ecological revetment in water source protection area and construction method thereof

Abstract

The present invention relates to the field of revetment construction in water source protection areas, and in particular to an ecological revetment in a water source protection area and a construction method thereof. The ecological revetment includes a primary revetment arranged below the beach elevation, a secondary revetment arranged above the beach elevation, and an ecological sewage interception and grass-planting ditch arranged between the primary revetment and the secondary revetment. The ecological sewage interception and grass-planting ditch is in the shape of a U-shaped groove and is arranged on one side of the second foundation close to the primary revetment. Compared with other reinforcement methods, the ecological revetment of the present invention has the advantages of short construction time, large reinforcement depth, good reinforcement quality, and significant economic benefits. In particular, the ecological sewage interception and grass-planting ditch specially arranged in the present invention not only improves the functional effects of the revetment in retaining soil, filtering, and draining, but also improves the ecological and cultural landscape of the revetment.

Description

Technical Field

[0001] The invention relates to the field of revetment construction in water source protection areas, in particular to an ecological revetment in a water source protection area and a construction method thereof. Background Art

[0002] In order to ensure that the embankment slope protection in the water source protection area can not only maintain water and soil and strengthen the embankment, but also purify water quality and maintain biodiversity, while reducing the impact of surface pollution on both sides of the river on the water body and achieving the goal of ecological water source protection area, the river ecological bank protection engineering technology has put forward higher requirements for retaining soil, filtration, drainage, ecological and cultural landscape design.

[0003] In order to effectively prevent soil erosion and ensure the safety of embankments, the key to the construction of ecological river bank protection is the treatment of river bank slopes. River ecological bank protection types include ecological concrete, stone masonry, natural grass and other forms. Different bank protection types have different engineering characteristics, applicable conditions, cost and hydraulic characteristics.

[0004] Common river ecological bank protection types meet the safety needs of flood control and flood prevention as well as the needs of riverside hydrophilic landscape and ecology. However, a single slope or simple buffer steps cannot solve the problem of cleaning and purifying debris or pollutants caused by rainwater erosion during the rainy season and flood season. Summary of the invention

[0005] In order to solve the above technical problems, one of the purposes of the present invention is to provide an ecological revetment, which has little impact on the original ecological structure and has high structural stability, takes into account the wave-breaking and scouring effects, and can also improve the ecological landscape.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] An ecological revetment for a water source protection area, comprising a primary revetment arranged below the beach elevation, a secondary revetment arranged above the beach elevation, and an ecological pollution interception grass-planted ditch arranged between the primary revetment and the secondary revetment; the primary revetment comprises, from bottom to top, a first foundation arranged at the shore foot, a primary slope protection arranged obliquely, and a first pressure cap arranged at the beach elevation, wherein the top surface of the first pressure cap is flush with the beach elevation line;

[0008] The secondary revetment includes, from bottom to top, a second foundation arranged at the beach line, an inclined secondary slope protection and a second pressure top arranged on the top of the bank, and the top surface of the second foundation is not lower than the top surface of the first pressure top; the ecological pollution interception grass planting ditch is in the shape of a U-shaped groove and is arranged on the side of the second foundation close to the primary revetment.

[0009] Furthermore, the primary slope protection includes a crushed stone cushion layer and a prefabricated block component layer sequentially arranged on the water-facing slope surface, and the secondary slope protection includes a composite geomembrane layer, a fine sand layer, a clay covering layer, a crushed stone cushion layer and a prefabricated block component layer sequentially arranged on the water-facing slope surface.

[0010] Furthermore, the secondary slope protection also includes a partition, which is arranged in the middle of the secondary slope protection. The cross-section of the partition is rectangular, and the center line along the depth direction of the partition is perpendicular to the water-facing slope of the secondary revetment, and the top surface of the partition is flush with the surface of the prefabricated block component layer.

[0011] Furthermore, the first-level revetment also includes a wire cage arranged below the water level, the wire cage is laid along the riverbed from the first basic position to the riverbed bottom elevation, and riprap is contained in the wire cage.

[0012] Furthermore, the prefabricated block component layer is composed of multiple grass planting unit interlocking blocks spliced ​​and laid flat, the grass planting unit interlocking blocks are prefabricated blocks such as commercially available prefabricated blocks, and the strength is not less than 30.0Mpa, and grass planting holes are also provided on the grass planting unit interlocking blocks.

[0013] Furthermore, the top surface width of the ecological sewage interception and grass-planting ditch is 400-800mm, and water retaining plates are arranged on both sides of the U-shaped groove of the ecological sewage interception and grass-planting ditch, and the top surface of the water retaining plate is flush with the second foundation; the ecological sewage interception and grass-planting ditch is filled with a crushed stone cushion layer, a gravel layer, a permeable geotextile covering layer, a clay covering layer, and a planting soil layer from top to bottom, and the surface of the planting soil layer is at least 100mm lower than the elevation of the top surface of the water retaining plate.

[0014] Furthermore, the water retaining plate includes a first water retaining plate close to the flow direction of the water and a second water retaining plate close to the second foundation; the first water retaining plate is provided with a water hole parallel to the flow direction of the water, and the first water retaining plate is also provided with an infiltration groove on the inner side, the infiltration groove is adjacent to the planting soil layer, the infiltration groove is filled with planting soil, and the top surface is paved with pebbles or gravel.

[0015] Furthermore, the porosity of the gravel layer is 35-45%, and the effective pore size is ≥80%. The planting soil layer is mixed with 20% fine sand and has a porosity of 25-35%.

[0016] Furthermore, the first foundation, the first pressure top, the second foundation, the second pressure top and the partitions all adopt mortar-laid block stone structures, and the first foundation has a size of 400mm×600mm, the second foundation has a size of 400mm×1000mm, and the first pressure top, the second pressure top and the partitions have a size of 200mm×400mm.

[0017] Furthermore, along the length direction of the first foundation, the second foundation, the first pressure top and the second pressure top, a settlement joint is arranged every 10-15m, and the settlement joint is filled with a foam board.

[0018] Furthermore, the slope rate of the first-level revetment is not greater than 1:5, and the slope rate of the second-level revetment is 1:5~1:2.5.

[0019] The second object of the present invention is to provide a construction method for the ecological revetment, which comprises the following steps:

[0020] Step 1: Construction of primary revetment:

[0021] S1. During the construction period, the first foundation is constructed by cutting a groove at the water level. The strength grade of the first foundation shall not be less than 7.5MPa, and settlement joints shall be set at intervals specified in the design. After the strength grade meets the requirements, an underwater wire cage is placed. The wire cage is laid along the riverbed from the first foundation position to the riverbed bottom elevation;

[0022] S2. The first pressure cap is applied at the beach elevation, and settlement joints are set at intervals specified in the design. The slope is lowered from the first pressure cap along the beach edge according to the designed slope rate to obtain the water-facing slope;

[0023] S3. Lay a 100 mm thick gravel cushion layer on the water-facing slope and compact it, lay grass-planting unit interlocking blocks on the gravel cushion layer to form a prefabricated block component layer, and after laying, fill the grass-planting holes of the grass-planting unit interlocking blocks with stone pieces, planting soil and green plants;

[0024] Step 2: Construction of ecological sewage interception and grass-planting ditch:

[0025] S1. According to the designed secondary revetment slope, slope upward at the beach elevation, clean and level the water-facing slope and beach surface, and then set the second foundation and settlement joint at the designed beach location;

[0026] S2. Dig an ecological sewage interception and grass planting ditch and set up a water retaining board. After leveling and compacting the pit foundation, set up an anti-seepage geomembrane on both sides of the ecological sewage interception and grass planting ditch. Then, lay a 100mm crushed stone cushion layer and a 200mm thick 6-80mm gravel layer in the pit in sequence. After leveling and compacting the gravel layer with coarse sand, lay a permeable geotextile. Finally, backfill with a 400mm clay cover layer and a 10-200mm planting soil. The top surface of the planting soil should be at least 100mm lower than the top surface elevation of the water retaining board, and plant suitable vegetation.

[0027] Step 3: Construction of secondary revetment

[0028] S1. Referring to steps 1 and 2, after the slope is laid according to the design, the second capping, settlement joints and partitions are constructed, and the strength grade of the second capping and partitions is not less than 10MPa;

[0029] S2. Lay the first composite geomembrane on the water-facing slope after the slope is cut, and extend the first composite geomembrane to the edge of the beach and the ecological pollution interception grass-planting ditch; lay a 50mm fine sand layer, a 100mm clay cover layer, and a 100mm crushed stone cushion layer on top of the first composite geomembrane in sequence and compact them, and continue to lay grass-planting unit interlocking blocks on the crushed stone cushion layer to form a prefabricated block component layer, using the same method as step 1.

[0030] The beneficial effects of the present invention are:

[0031] 1. The present invention can adapt to the beach width of at least 20m between the primary revetment and the secondary revetment. The secondary revetment is added on the basis of the primary revetment, which not only improves the protection height of the revetment, but also increases the hydrophilicity of the revetment. At the same time, the ecological revetment can provide a better ecological landscape in different water levels.

[0032] 2. The layout of the revetment must be adapted to local conditions. It must protect the bank slope and reduce land loss, and it must be economical, reasonable and convenient for construction. For revetment projects on both sides of the river with beaches, stepped bank slopes, or bridges, especially in water source protection areas, it is necessary to meet the river bank protection and flood control functions, and also to achieve natural landscape, ecological protection and sewage interception and water purification functions, and to be full of vitality in the senses. The present invention specially arranges an ecological sewage interception and grass-planting ditch, which provides a flexible ecological structure for the revetment, which improves the functional effects of the revetment in retaining soil, filtering and drainage, and improves the ecological and cultural landscape of the revetment.

[0033] 3. Compared with other reinforcement methods, the implementation scheme of the present invention has the advantages of small size, short construction time, small footprint, large reinforcement depth, good reinforcement quality, significant economic benefits, etc., and the mechanical equipment used in the construction is simple, no foreign imported equipment is required, and it is easy to operate. At the same time, the impact of the construction structure on the original structure can be reduced by reasonably selecting green plants, thereby improving its ecological landscape. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The invention patent of the present invention is further described below in conjunction with the accompanying drawings.

[0035] Figure 1 This is a structural diagram of the first-level revetment;

[0036] Figure 2 This is a schematic diagram of the structure of the secondary revetment;

[0037] Figure 3 A cross-section of a grass-planted ditch for ecological pollution interception;

[0038] Figure 4 It is an overall schematic diagram of the bank protection of the present invention;

[0039] FIG5 is a schematic diagram of the structure of the grass planting unit interlocking block, wherein Figure 5Ais a top view, Figure 5B is a side view;

[0040] Figure 6 It is a schematic diagram of the splicing of the interlocking blocks of the grass planting unit.

[0041] The meanings of the symbols in the figure are as follows:

[0042] 10-First level revetment 11-First foundation 12-First level slope protection 13-First top pressure 14-Wire cage

[0043] 20-Secondary revetment 21-Second foundation 22-Secondary slope protection 23-Second top pressure 24-Separation stem

[0044] 30-ecological sewage interception and grass planting ditch 31-first water retaining plate 311-water hole 32-seepage trough

[0045] 33-second water retaining plate 41-composite geomembrane layer 42-fine sand layer 43-clay cover layer

[0046] 44- gravel cushion layer 45- prefabricated block component layer 451- grass planting unit interlocking block 452- grass planting hole

[0047] 51- Gravel layer 52- Permeable geotextile covering layer 53- Planting soil layer 54- Anti-seepage geomembrane

[0048] 55-flower pipe a-beach elevation b-riverbed elevation. DETAILED DESCRIPTION

[0049] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments. Example

[0050] like Figure 1-4 As shown, an ecological revetment for a water source protection area comprises a primary revetment 10 arranged below the beach elevation a, a secondary revetment 20 arranged above the beach elevation a, and an ecological pollution interception grass-planted ditch 30 arranged between the primary revetment 10 and the secondary revetment 20, wherein the slope rate of the primary revetment 10 is not greater than 1:5, and the slope rate of the secondary revetment 20 is 1:5~1:2.5.

[0051] The primary revetment 10 includes, from bottom to top, a first foundation 11 set at the foot of the bank, a first slope protection 12 set at an angle, a first pressure cap 13 set at the beach elevation a, and a wire cage 14 set below the water level. The top surface of the first pressure cap 13 is flush with the beach elevation a, the primary slope protection 12 includes a 100mm thick gravel cushion layer 44 and a 120mm thick prefabricated block component layer 45 set on the water-facing slope, the wire cage 14 is laid along the riverbed from the first foundation 11 to the riverbed bottom elevation b, and the wire cage 14 is filled with riprap. The water-facing slope is the water-facing embankment slope formed after the original beach is sloped according to the designed slope.

[0052] The secondary revetment 20 includes, from bottom to top, a second foundation 21 arranged at the beach line, a secondary slope protection 22 arranged obliquely, and a second pressure cap 23 arranged on the bank top. Since the beach is generally in a natural state, the beach elevation a at the first pressure cap 13 and the second foundation 21 is difficult to be consistent. Generally, the beach elevation a at the water side, i.e., the first pressure cap 13, is slightly smaller. Therefore, the top surface of the second foundation 21 is not lower than the top surface of the first pressure cap 13; the secondary slope protection 22 includes a composite geomembrane layer 41, a 50mm thick fine sand layer 42, a 100mm thick clay cover layer 43, a 100mm thick crushed stone cushion layer 44 and a 120mm thick prefabricated block component layer 45, which are arranged in sequence on the water-facing slope.

[0053] The secondary slope protection 22 also includes a partition 24, which is arranged in the middle of the secondary slope protection 22. The cross-section of the partition 24 is rectangular. The depth direction of the partition 24 is perpendicular to the inclined surface of the secondary slope protection 22, and the top surface of the partition 24 is flush with the surface of the prefabricated block component layer 45.

[0054] In this embodiment, the first foundation 11, the first pressure top 13, the second foundation 21, the second pressure top 23 and the partition 24 all adopt a rectangular mortar-laid block stone structure, and the size of the first foundation 11 is 400mm×600mm, the size of the second foundation 21 is 400mm×1000mm, the size of the first pressure top 13, the second pressure top 23 and the partition 24 are all 200mm×400mm, and the length is determined according to the actual construction situation.

[0055] Along the length direction of the first foundation, the second foundation, the first pressure top and the second pressure top, a settlement joint is arranged every 10-15m, and the settlement joint is filled with foam boards.

[0056] The ecological sewage interception and grass planting ditch 30 is in the shape of a U-shaped groove and is arranged on the side of the second foundation 21 close to the primary revetment 10. The top surface of the ecological sewage interception and grass planting ditch 30, i.e., the width of the U-shaped groove, is 400-800mm. Water retaining plates are arranged on both sides of the U-shaped groove of the ecological sewage interception and grass planting ditch 30. The top surface of the water retaining plate is flush with the second foundation 21. The water retaining plates include a first water retaining plate 31 and a second water retaining plate 33. Two water holes 311 parallel to the flow direction of the water are opened on the first water retaining plate 31 close to the flow direction of the water collection. The two water holes 311 are one high and one low, which is convenient for water flow at different water levels. The ecological sewage interception and grass planting ditch 30 is also provided with a seepage groove 32 on the inner side of the first water retaining plate 31. The seepage groove 32 is adjacent to the planting soil layer 53. The seepage groove 32 is filled with planting soil, and the top surface is paved with pebbles or gravel. A PE baffle can also be arranged on the side of the pebbles or gravel close to the planting soil layer 53 to prevent the pebbles or gravel from shifting.

[0057] The two sides of the ecological sewage interception and grass planting ditch 30 are provided with anti-seepage geomembranes 54, which are two-fabric and one-membrane structures. The ecological sewage interception and grass planting ditch 30 is filled with 100mm crushed stone cushion layer 44, 200mm gravel layer 51, permeable geotextile covering layer 52, 400mm clay covering layer 43, and 40-600mm planting soil layer 53 from top to bottom. The surface of the planting soil layer 53 is at least 100mm lower than the top elevation of the water retaining plate. The gravel layer 51 is provided with a d100 flower pipe 55 for drainage. When the ecological sewage interception and grass planting ditch 30 is used for the overflow well, a 150mm concrete foundation is added below the gravel layer 51. The porosity of the gravel layer 51 is guaranteed to be 35-45%, and the effective pore size is ≥80%. The planting soil layer 53 is mixed with 20% fine sand and has a porosity of 25-35%.

[0058] In this embodiment, the prefabricated block component layer 45 is composed of a plurality of grass planting unit interlocking blocks 451 spliced ​​and laid flat. In this embodiment, the grass planting unit interlocking blocks 451 are C20 concrete prefabricated blocks, such as Figure 5A , 5B As shown in 6, the grass planting unit interlocking block 451 is in an I-shape, and grooves are provided on the long and short sides of the I-shape. Adjacent grass planting unit interlocking blocks 451 are spliced ​​into a whole through the grooves. A grass planting hole 452 for planting is also provided in the middle of the long side of the I-shape, and the hole can be filled with soil and grass can be planted. The grass planting unit interlocking block 451 can also be a commercially available prefabricated block component, and the component strength should not be less than 30.0Mpa. Example

[0059] The construction method of the ecological revetment in the water source protection area of ​​embodiment 1 comprises the following steps:

[0060] Step 1: Construction of primary revetment 10:

[0061] S1. During the construction period, a groove is opened at the water level line to construct the first foundation 11. The strength grade of the first foundation 11 is not less than 7.5MPa, and settlement joints are set at intervals as specified in the design. After the strength grade meets the requirements, an underwater wire cage 14 is placed. The wire cage 14 is laid along the riverbed from the first foundation 11 to the riverbed bottom elevation b;

[0062] S2. A first pressure cap 13 is applied at the beach elevation a, and settlement joints are set at intervals specified in the design, and a slope is laid down along the beach edge from the first pressure cap 13 according to the designed slope rate to obtain a water-facing slope;

[0063] S3. Lay a 100mm thick gravel cushion layer 44 on the waterfront slope and compact it. Lay grass planting unit interlocking blocks 451 on the gravel cushion layer 44 to form a prefabricated block member layer 45. After laying, fill the grass planting holes of the grass planting unit interlocking blocks 451 with stone and planting soil.

[0064] Step 2: Construction of ecological sewage interception and grass planting ditch 30:

[0065] S1. According to the designed secondary revetment 20 slope, the slope is lowered from the beach elevation a, the slope surface and the beach surface are cleaned and leveled, and then the second foundation 21 and the settlement joint are set at the designed location of the beach;

[0066] S2. Excavate the ecological sewage interception and grass planting ditch 30 and set up a water retaining board. After leveling and compacting the pit foundation, set up an anti-seepage geomembrane 54 on both sides of the ecological sewage interception and grass planting ditch 30, and lay a 100mm crushed stone cushion layer 44 and a 200mm thick 6-80mm grain size gravel layer 51 in the pit in sequence. After leveling and compacting the gravel layer 51 with coarse sand, lay a permeable geotextile cover layer 52, and finally backfill with a 400mm clay cover layer 43 and a 10-200mm planting soil layer 53. The top surface height of the planting soil layer 53 is at least 100mm lower than the top surface elevation of the water retaining board, and plant suitable vegetation;

[0067] Step 3: Construction of secondary revetment 20

[0068] S1. Referring to steps one and two, according to the designed slope, the second pressure top 23, settlement joints and partitions 24 are constructed. The strength grade of the second pressure top 23 and partitions 24 is not less than 10MPa;

[0069] S2. Lay the first composite geomembrane layer 41 on the water-facing slope after the slope is cut, and extend the first composite geomembrane layer 41 to the edge of the beach and the ecological pollution interception grass-planting ditch 30; lay a 50mm fine sand layer 42, a 100mm clay cover layer 43, and a 100mm gravel cushion layer 44 on the first composite geomembrane layer 41 in sequence and compact them, and continue to lay grass-planting unit interlocking blocks 451 on the gravel cushion layer 44 to form a prefabricated block component layer 45, the method is the same as step 1.

Claims

1. A construction method for ecological revetment in a water source protection area, characterized in that: The ecological revetment of the water source protection area comprises a primary revetment (10) arranged below the beach elevation (a), a secondary revetment (20) arranged above the beach elevation (a), and an ecological pollution interception grass-planting ditch (30) arranged between the primary revetment (10) and the secondary revetment (20); the primary revetment (10) comprises, from bottom to top, a first foundation (11) arranged at the foot of the bank, a primary slope protection (12) arranged obliquely, and a first pressure cap (13) arranged at the beach elevation (a), the top surface of the first pressure cap (13) being flush with the beach elevation (a) line; The secondary revetment (20) comprises, from bottom to top, a second foundation (21) arranged at the beach line, a second slope protection (22) arranged obliquely, and a second pressure top (23) arranged at the top of the embankment, wherein the top surface of the second foundation (21) is not lower than the top surface of the first pressure top (13); the ecological pollution interception grass planting ditch (30) is in the shape of a U-shaped groove and is arranged on one side of the second foundation (21) close to the primary revetment (10). The primary slope protection (12) comprises a crushed stone cushion layer (44) and a prefabricated block component layer (45) which are arranged on the water-facing slope surface in order from bottom to top, and the secondary slope protection (22) comprises a composite geomembrane layer (41), a fine sand layer (42), a clay cover layer (43), a crushed stone cushion layer (44) and a prefabricated block component layer (45) which are arranged on the water-facing slope surface in order from bottom to top; The secondary slope protection (22) further comprises a partition (24), the partition (24) being arranged in the middle of the secondary slope protection (22), the cross section of the partition (24) being rectangular, the depth direction of the partition (24) being perpendicular to the water-facing slope surface of the secondary slope protection (22), and the top surface of the partition (24) being flush with the surface of the prefabricated block component layer (45); The first-level revetment (10) further comprises a wire cage (14) arranged below the water level, the wire cage (14) being laid along the riverbed from the position of the first foundation (11) to the riverbed bottom elevation (b), and riprap being contained in the wire cage (14); The prefabricated block component layer (45) is composed of a plurality of grass planting unit interlocking blocks (451) that are spliced ​​and laid flat, the grass planting unit interlocking blocks (451) are prefabricated blocks with a strength of not less than 30.0 Mpa, and grass planting holes (452) are also provided on the grass planting unit interlocking blocks (451); The top surface width of the ecological pollution interception and grass planting ditch (30) is 400-800 mm. Water retaining plates are arranged on both sides of the U-shaped notch of the ecological pollution interception and grass planting ditch (30), and the top surface of the water retaining plate is flush with the second foundation (21); the ecological pollution interception and grass planting ditch (30) is filled with a crushed stone cushion layer (44), a gravel layer (51), a permeable geotextile covering layer (52), a clay covering layer (43), and a planting soil layer (53) in order from bottom to top, and the surface of the planting soil layer (53) is at least 100 mm lower than the top surface elevation of the water retaining plate; Settlement joints are arranged at intervals along the length direction of the first foundation (11), the second foundation (21), the first pressure top (13), and the second pressure top (23); The following steps are involved: Step 1: Construction of primary revetment (10): S1. A first foundation (11) is constructed by cutting a groove at the water level during the construction period. The strength grade of the first foundation (11) is not less than 7.5 MPa, and settlement joints are arranged at intervals specified in the design. After the strength grade meets the requirements, an underwater wire cage (14) is placed. The wire cage (14) is laid along the riverbed from the position of the first foundation (11) to the riverbed bottom elevation (b); S2. A first pressure cap (13) is applied at the beach elevation (a), and settlement joints are arranged at intervals specified in the design, and a slope is laid down along the beach edge from the first pressure cap (13) according to the designed slope rate to obtain a water-facing slope; S3. A 100 mm thick gravel cushion layer (44) is laid on the water-facing slope and compacted. A grass planting unit interlocking block (451) is laid on the gravel cushion layer (44) to form a prefabricated block component layer (45). After laying, the grass planting holes of the grass planting unit interlocking block (451) are filled with stone and planting soil and green plants; Step 2: Construction of ecological sewage interception and grass-planting ditch (30): S1. According to the designed slope of the secondary revetment (20), the slope is raised upward at the beach elevation (a), the water-facing slope and the beach surface are cleaned and leveled, and then the second foundation (21) and the settlement joint are set at the designed position; S2. Excavate an ecological sewage interception and grass planting ditch (30) and set up a water retaining board. After leveling and compacting the pit foundation, set up an anti-seepage geomembrane layer (54) on both sides of the ecological sewage interception and grass planting ditch (30). Then, lay a 100 mm crushed stone cushion layer (44) and a 200 mm thick gravel layer (51) with a particle size of 6-80 mm in the pit in sequence. Use coarse sand to level the gravel layer (51). After compaction, lay a permeable geotextile covering layer (52). Finally, backfill with a 400 mm clay covering layer (43) and a 10-200 mm planting soil layer (53). The top surface of the planting soil layer (53) is at least 100 mm lower than the top surface elevation of the water retaining board, and plant suitable vegetation. Step 3: Construction of secondary revetment (20): S1. Referring to steps 1 and 2, after the slope is laid according to the design, a second pressure cap (23), a settlement joint and a partition (24) are applied, and the strength grade of the second pressure cap (23) and the partition (24) is not less than 10 MPa; S2. Laying the first composite geomembrane layer (41) on the water-facing slope after the slope is cut, and extending the first composite geomembrane layer (41) to the edge of the beach and the ecological sewage interception grass-planting ditch (30); laying a 50 mm fine sand layer (42), a 100 mm clay cover layer (43), and a 100 mm crushed stone cushion layer (44) on the first composite geomembrane layer (41) in sequence and compacting them, and continuing to lay grass-planting unit interlocking blocks (451) on the crushed stone cushion layer (44) to form a prefabricated block component layer (45).

2. The construction method of ecological revetment in a water source protection area according to claim 1, characterized in that: The water retaining plate comprises a first water retaining plate (31) close to the flow direction of the water collection and a second water retaining plate (33) close to the second foundation (21); the first water retaining plate (31) is provided with a water hole (311) parallel to the flow direction of the water collection; the ecological sewage interception and grass planting ditch (30) is further provided with a water seepage groove (32) on the inner side of the first water retaining plate (31); the water seepage groove (32) is adjacent to the planting soil layer (53); the water seepage groove (32) is filled with planting soil, and the top surface is paved with pebbles or crushed stones.

3. The construction method of ecological revetment in a water source protection area according to claim 1, characterized in that: The first foundation (11), the first pressure top (13), the second foundation (21), the second pressure top (23) and the partition (24) all adopt a mortar-laid block stone structure, and the first foundation (11) has a size of 400 mm×600 mm, the second foundation (21) has a size of 400 mm×1000 mm, and the first pressure top (13), the second pressure top (23) and the partition (24) all have a size of 200 mm×400 mm.

4. The construction method of ecological revetment in a water source protection area according to claim 1, characterized in that: Along the length direction of the first foundation (11), the second foundation (21), the first pressure top (13), and the second pressure top (23), a settlement joint is arranged every 10-15 m, and the settlement joint is filled with a foam board.

5. The construction method of ecological revetment in a water source protection area according to claim 1, characterized in that: The slope rate of the first-level revetment (10) is not greater than 1:5, and the slope rate of the second-level revetment (20) is 1:5-1:2.5.

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