Capillary blocking type slope protection system based on recycled aggregate ecological concrete and construction method of capillary blocking type slope protection system

Abstract

The invention discloses a capillary blocking type slope protection system based on recycled aggregate ecological concrete and a construction method of the capillary blocking type slope protection system. The capillary blocking type slope protection system is composed of a side slope, lattice beams, anchor rods, slope bottom drainage pipes, slope body drainage pipes, lattice unit drainage pipes, drainage channels, a recycled aggregate ecological concrete layer, an earthwork recycled fine grain layer and a vegetation layer. The construction method comprises the steps that after the slope body drainage pipes and the anchor rods are embedded in the slope body, drainage channels and slope bottom drainage pipes are constructed at the slope bottom, then lattice beams are poured on the slope surface, and after lattice unit drainage pipes are erected, the recycled aggregate ecological concrete layer, the recycled fine grain layer and the vegetation layer are backfilled layer by layer. The recycled aggregate ecological concrete layer is used as a coarse grain layer in a traditional capillary blocking structure, recycled aggregate ecological concrete is used for bottom layer pouring of a lattice beam transverse framework, and a slope protection system with the excellent anti-seepage slope fixing performance and drainage performance is formed. According to the slope protection system, the toughness of the ecological slope is improved, and green and high-value utilization of engineering earth and stone resources is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of slope protection engineering, and particularly to a capillary-blocking type slope protection system based on recycled aggregate ecological concrete and a construction method thereof. Technical Background

[0002] At present, the ecological protection method commonly used in slope engineering is lattice grass planting slope protection. This ecological slope protection method mainly backfills planting soil inside the lattice unit and sprays seeds and substrates; for areas where the surface weathering of the slope body is relatively serious, a layer of steel mesh will be laid and a layer of concrete will be poured for reinforcement before the construction of the lattice beam. For the lattice grass planting slope protection without pouring the bottom concrete, its anti-seepage performance is poor, and it cannot effectively prevent rainwater infiltration during continuous rainfall or heavy rainfall. Moreover, since the lattice beam does not have drainage performance inside, rainwater will also accumulate at the bottom of the lattice unit and cannot be effectively discharged. For the lattice grass planting slope protection with the bottom concrete poured in advance, although it can effectively prevent rainwater infiltration, the concrete layer also isolates the nutrient exchange between the vegetation layer and the underlying slope body, and the vegetation roots are also difficult to grow into the slope bottom. After the nutrients in the vegetation layer gradually become poor, the phenomenon of vegetation degradation is likely to occur; and in extreme rainfall conditions, due to the difficulty of water moving downward and the inability to be quickly and effectively discharged, the vegetation roots will rot due to long-term immersion.

[0003] The capillary-blocking technology utilizes the characteristic that the hydraulic conductivity between the coarse-grained layer and the fine-grained layer varies greatly, and is widely used in the cover layer of landfills. According to the theory of unsaturated soil mechanics, at the beginning of rainfall, the water content of the fine-grained layer and the coarse-grained layer is relatively low, and the matrix suction is relatively large. At this time, the permeability coefficient of the coarse-grained layer is less than that of the fine-grained soil. After the rainwater passes through the fine-grained layer, it will be blocked between the coarse and fine-grained layers and discharged through lateral drainage; as the rainfall time continues to increase, the continuous infiltration of rainwater causes the matrix suction of the coarse-grained layer to decrease, and the permeability coefficient gradually increases. Eventually, the permeability coefficient of the coarse-grained layer will be greater than that of the fine-grained soil, and the capillary-blocking effect fails. The rainwater breaks through the coarse-grained layer. At this time, the strong water-conducting performance of the coarse-grained layer can effectively discharge the rainwater, thereby reducing the downward movement of water; when the rainfall ends, the strong water-holding capacity in the fine-grained layer can store sufficient water, which is beneficial to the long-term growth of the surface vegetation. The excellent water storage-drainage performance of the capillary-blocking cover layer provides a new idea for solving the deficiencies in ecological slope protection. However, if the capillary-blocking technology is to be widely applied to the protection of ecological slopes, there are still the following problems:

[0004] (1) Insufficient stability of the coarse-grained layer. Traditional capillary-blocking cover layers usually use gravel, coarse sand, medium sand, etc. as the filling materials for the coarse-grained layer. However, since these materials have large particle sizes and no cohesion between particles, when the slope gradient is large, the coarse-grained layer is prone to sliding under the influence of its own gravity and cannot be stable on the slope surface.

[0005] (2)Insufficient reinforcement performance for the slope. For slopes with poor surface lithology and high weathering degree, the coverage of the capillary barrier cover layer cannot directly enhance the slope strength, and there is still a risk of further deformation.

[0006] (3)Poor air permeability of the cover layer. Since the fine-grained layer of the capillary barrier cover layer needs to have a high degree of compaction, its air permeability is low, the soil oxygen content is small, which is not conducive to the respiration and growth of vegetation.

[0007] (4)Lack of economy and environmental protection. Most of the materials used in the traditional capillary barrier cover layer technology are imported soil, and the transportation of a large amount of materials will inevitably increase the construction cost. Moreover, the landfill of imported soil requires a large amount of land, including cultivated land, forest land and production roads, resulting in environmental pollution problems.

[0008] (5)Insufficient drainage performance of the lattice beam. In the traditional lattice grass planting support, each lattice unit is equivalent to a closed space surrounded by four sides, and the accumulated water inside can only migrate underground and is difficult to migrate along the slope surface to the bottom of the slope. A top-down drainage system has not been formed.

[0009] Therefore, it is urgent to explore a capillary barrier type ecological slope protection system with strong self-stability, which can effectively reinforce the slope, has good soil layer air permeability, has anti-seepage and moisture retention performance, strong drainage performance and is more environmentally friendly. Summary of the Invention

[0010] In view of the above problems, the purpose of the present invention is to provide a capillary barrier type slope protection system based on recycled aggregate ecological concrete and its construction method. The system has a more stable self-structure, plays a role in reinforcing the slope, has good soil layer air permeability, excellent anti-seepage and moisture retention performance, strong drainage performance and is environmentally friendly.

[0011] In order to achieve the above-mentioned invention object, the technical solution of the present invention is as follows: A capillary blockage type slope protection system based on recycled aggregate ecological concrete is composed of a slope, lattice beams, anchor rods, slope bottom drain pipes, slope body drain pipes, lattice unit drain pipes, drainage channels, recycled aggregate ecological concrete layers, earthwork recycled fine particle layers and vegetation layers. The lattice beams are cast above the slope surface. The bottom of the transverse skeleton of the lattice beam is a recycled aggregate ecological concrete layer. The anchor rods are arranged at the lattice beam nodes and anchored inside the slope body. One end of the slope body drain pipe is buried inside the lattice unit slope body, and the other end is erected on the lattice beam. The lattice unit drain pipes are arranged at the four corner points of the lattice unit. The drainage channel is arranged at the slope foot. The slope bottom drain pipe is pre-buried on the side where the drainage channel contacts the slope bottom. The covering layer inside the lattice unit from top to bottom is respectively a vegetation layer, a three-dimensional vegetation net, an earthwork recycled fine particle layer, a geotextile, and a recycled aggregate ecological concrete layer. The aggregate used in the recycled aggregate ecological concrete layer is the coarse aggregate obtained after the engineering earthwork is crushed and processed and separated, with a particle size of 10 - 25 mm. The earthwork recycled fine particle layer is silty soil or silty clay obtained after the earthwork is crushed and processed and separated. The vegetation layer is planting soil formed by mixing the topsoil screened from the earthwork with compound fertilizer and organic fertilizer, and is sprayed on the three-dimensional vegetation net by a spray seeding machine.

[0012] The lattice beams are arranged on the slope surface, and a plurality of lattice units are formed by the transverse skeleton and vertical skeleton of the lattice beams. A water retaining sill is provided at the top for guiding rainwater to drain downward along the vertical skeleton of the lattice beams.

[0013] The outer end of the anchor rod is contained inside the lattice beam after the lattice beam is cast.

[0014] The vegetation layer, the earthwork recycled fine particle layer, and the recycled aggregate ecological concrete layer cover the inside of the lattice unit, and the sum of their thicknesses is flush with the top of the vertical skeleton of the lattice beam.

[0015] The thickness of the recycled aggregate ecological concrete layer inside the lattice unit is 50 mm - 100 mm, the thickness of the recycled aggregate ecological concrete layer at the bottom of the transverse skeleton of the lattice beam is 50 mm - 150 mm, the porosity of the recycled aggregate ecological concrete layer is 21% - 30%, the permeability coefficient is not less than 1×10 -3 m / s, the compressive strength is not less than 15 MPa, and the pH value is 8 - 10.

[0016] The earthwork recycled fine particle layer has a thickness of 150 mm - 300 mm, a compaction degree not less than 90%, and a saturated permeability coefficient of 1×10 -8 m / s - 1×10 -6 m / s. The earthwork recycled fine particle layer covers the recycled aggregate ecological concrete layer, and a layer of geotextile is spaced between the two. The specification of the geotextile is 150 g / m2 ~200g / m 2 .

[0017] The three-dimensional vegetation net is laid on the surface of the regenerated fine-grained layer of earth and stone and fixed with J-shaped nails. The thickness of the vegetation layer is 100 mm to 150 mm.

[0018] The pre-buried position at the bottom of the slope bottom drainage pipe is flush with the bottom of the recycled aggregate ecological concrete layer.

[0019] The material used for the slope bottom drainage pipe is HDPE drainage pipe, both ends of which are wrapped with geotextile and fixed with hoops. The material used for the slope drainage pipe is HDPE hard toothed mesh permeable pipe, which is wrapped with two circles of geotextile on the outside and fixed with hoops. The lattice unit drainage pipe pre-uses HDPE hard toothed mesh permeable pipe, which is wrapped with two circles of geotextile on the outside and fixed with hoops, and the inside is filled with recycled coarse aggregate of earth and stone.

[0020] The HDPE is a high-density polyethylene pipe, all of which are commercially available.

[0021] The method for constructing the capillary retardation slope protection system based on recycled aggregate eco-concrete comprises the following steps:

[0022] (1) Excavate and trim the slope surface, brush out a smooth slope surface, and groove the designed position of the lattice beam;

[0023] (2) Position the anchor rods and slope drainage pipes according to the designed positions, drill anchor rod holes and slope drainage pipe holes step by step from the top of the slope downwards, insert the anchor rods and grout, include the anchor rods inside the lattice beams when casting the lattice beams, and then install and fix the slope drainage pipes;

[0024] (3) The drainage channel is excavated vertically at the foot of the slope. After the steel bars are tied and the formwork is fixed, the drainage pipe at the bottom of the slope is fixed at the designed position and concrete pouring can be carried out;

[0025] (4) Tie the steel bars and fix the formwork of the lattice beams. First, pour the recycled aggregate eco-concrete layer at the bottom of the transverse skeleton beam of the lattice beam. After curing for 10 days, pour the recycled aggregate concrete for the rest of the lattice beams. The curing time after pouring shall not be less than 7 days.

[0026] (5) After the lattice beam is cured, the lattice unit drainage pipes are installed at the four corners of the lattice unit, and then the recycled aggregate eco-concrete layer is poured. The curing time after pouring shall not be less than 7 days;

[0027] (6) After the recycled aggregate eco-concrete layer is cured, a geotextile is laid on top of it and fixed with iron nails, and then covered with the recycled fine-grained layer of earth and stone backfilled. It is required to backfill and compact layer by layer to meet the designed compaction degree;

[0028] (7) Lay a three-dimensional vegetation net on the fine-grained layer of recycled earthwork and stone, fix it with J-shaped nails, tie the lap joints with geotextile ropes, and finally spray and sow the planting soil to form a vegetation layer, and replant and sprinkle water for maintenance in the early stage of vegetation growth.

[0029] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0030] 1. Combine the lattice beam with the capillary barrier technology, and replace the single planting soil covering layer of the lattice unit in the original lattice grass slope protection with a regenerated aggregate ecological concrete layer, a fine-grained layer of recycled earthwork and stone, and a vegetation layer, which improves the overall anti-seepage and moisture retention performance of the covering layer;

[0031] 2. Cover the capillary barrier covering layer inside the lattice unit, and the lattice beams around the lattice unit play a role in restraining and fixing the internal covering layer, which can effectively solve the problems of insufficient self-stability of the covering layer and soil erosion;

[0032] 3. Use the regenerated aggregate ecological concrete as the material of the coarse-grained layer in the capillary barrier structure, which has a large difference in hydraulic conductivity characteristics from the fine-grained soil layer. There is still a capillary barrier effect between the two theoretically. At the same time, the regenerated aggregate ecological concrete can play a strong reinforcement role on the surface layer of the slope, which is beneficial to further improving the stability of the slope;

[0033] 4. Use the regenerated aggregate ecological concrete as the bottom layer of the transverse skeleton of the lattice beam, which has strong water permeability. Combined with the drain pipe at the bottom of the slope, a complete drainage system is formed from top to bottom;

[0034] 5. A lattice unit drain pipe is arranged inside the lattice unit, and the inside is filled with gravel, which can be used as a drainage path inside the covering layer and can also increase the air permeability of the internal soil body, enhancing the material exchange with the outside world;

[0035] 6. The aggregate used in the regenerated aggregate ecological concrete is the regenerated coarse aggregate after the engineering earthwork and stone are crushed, processed and separated. The material used in the fine-grained layer of recycled earthwork and stone is the silt or silty clay after the engineering earthwork and stone are crushed, processed and separated. The material used in the vegetation layer is the topsoil after the engineering earthwork and stone are screened, thus reducing the cost of engineering materials and providing a path for the reuse of engineering earthwork and stone, realizing the green and high-value utilization of earthwork and stone resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic structural diagram of the capillary barrier type slope protection system based on regenerated aggregate ecological concrete described in the present invention.

[0037] Figure 2 It is a schematic 1-1 sectional view of the capillary barrier type slope protection system based on regenerated aggregate ecological concrete described in the present invention.

[0038] Figure 3 It is a schematic diagram of the 2-2 section of the capillary-blocking type slope protection system based on recycled aggregate ecological concrete described in the present invention.

[0039] Figure 4 It is a schematic diagram of the 3-3 section of the capillary-blocking type slope protection system based on recycled aggregate ecological concrete described in the present invention.

[0040] Figure 5 It is a schematic diagram of the lattice beam of the capillary-blocking type slope protection system based on recycled aggregate ecological concrete described in the present invention.

[0041] Figure 6 It is a schematic diagram of the drain pipe of the capillary-blocking type slope protection system based on recycled aggregate ecological concrete described in the present invention.

[0042] The markings in the figure are: lattice beam 1, water retaining sill 2, anchor rod 3, bottom slope drain pipe 4, slope body drain pipe 5, lattice unit drain pipe 6, vegetation layer 7, slope 8, drainage channel 9, recycled aggregate ecological concrete layers 101-102, geotextile 111-113, earth-rock recycled fine particle layer 12, three-dimensional vegetation net 13, HDPE pipe 14, hoop 15, HDPE rigid corrugated mesh permeable drain pipe 16, earth-rock recycled crushed stone 17, recycled aggregate concrete 18. Specific implementation manners

[0043] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0044] Embodiment 1

[0045] As Figures 1 to 6 shown, a capillary-blocking type slope protection system based on recycled aggregate ecological concrete described in the present invention is composed of a slope 8, a lattice beam 1, an anchor rod 3, a bottom slope drain pipe 4, a slope body drain pipe 5, a lattice unit drain pipe 6, a drainage channel 9, a recycled aggregate ecological concrete layer 101, an earth-rock recycled fine particle layer 12, and a vegetation layer 7. The lattice beam 1 is cast above the slope surface of the slope 8. The bottom of the transverse skeleton of the lattice beam 1 is a recycled aggregate ecological concrete layer 102, and the upper part is made of recycled aggregate concrete 18. The anchor rod 3 is arranged at the node of the lattice beam 1 and anchored inside the slope body. One end of the slope body drain pipe 5 is buried inside the lattice unit slope body, and the other end is erected on the lattice beam 3. The lattice unit drain pipe 6 is arranged at the four corner points of the lattice unit. The drainage channel 9 is arranged at the slope toe. The bottom slope drain pipe 4 is pre-buried on the side where the drainage channel 9 contacts the bottom slope. The covering layers inside the lattice unit are, from top to bottom, a vegetation layer 7, a three-dimensional vegetation net 13, an earth-rock recycled fine particle layer 12, a geotextile 111, and a recycled aggregate ecological concrete layer 101.

[0046] In this example, the cross-sectional dimension of the lattice beam 1 is 300 mm × 400 mm, the grooving depth is 100 mm, and the distance from the slope surface to the surface of the vertical skeleton of the lattice beam 1 is 300 mm.

[0047] As Figure 2 、 Figure 3 shown, the lattice beam 1 is arranged on the slope surface, and multiple lattice units are formed by the transverse skeleton and the vertical skeleton of the lattice beam 1. A water retaining sill 2 is provided at the top of the lattice beam 1 to guide rainwater to drain downward along the vertical skeleton of the lattice beam 1. The outer end of the anchor rod 3 is contained inside the lattice beam 1 after the lattice beam 1 is poured. The vegetation layer 7, the soil and stone regenerated fine-grained layer 12, and the recycled aggregate ecological concrete layer 101 cover the inside of the lattice unit, and the sum of their thicknesses is flush with the top of the vertical skeleton of the lattice beam 1, that is, the total thickness of the capillary barrier covering layer is 300 mm.

[0048] The recycled aggregate ecological concrete layer 10 covers the slope surface inside the lattice unit, and the thickness is controlled at 50 mm. The porosity of the recycled aggregate ecological concrete layer 101 is 25%, the water permeability coefficient is 8×10 -3 m / s, the compressive strength is 15 MPa, and the pH value is 9. The aggregate used in the recycled aggregate ecological concrete layer 101 is the coarse aggregate obtained by crushing and processing separation of engineering soil and stone, and the particle size is 20 mm.

[0049] The soil and stone regenerated fine-grained layer 12 covers the upper part of the recycled aggregate ecological concrete layer 101, and a layer of geotextile 111 is spaced between the two. The specification of the geotextile 111 is 150 g / m 2 . The thickness of the soil and stone regenerated fine-grained layer 12 is 150 mm, the compaction degree is 90%, and the saturated permeability coefficient is 1×10 -7 m / s. The material used in the soil and stone regenerated fine-grained layer 12 is the silt or silty clay obtained by crushing and processing separation of soil and stone.

[0050] The three-dimensional vegetation net 13 is laid on the surface of the soil and stone regenerated fine-grained layer 12 and fixed with J-shaped nails. The thickness of the vegetation layer 7 is 100 mm, and the material used is the planting soil mixed with the topsoil screened from soil and stone, compound fertilizer, organic fertilizer and plant seeds, and is sprayed on the three-dimensional vegetation net 13 by a spraying machine. Among them, the dosage of plant seeds is 70 g / m 2 , including various plant types such as bermudagrass, bahiagrass, tall fescue and cosmos.

[0051] As Figure 5 shown, the thickness of the recycled aggregate ecological concrete layer 102 at the bottom of the transverse skeleton of the lattice beam 1 is 150 mm.

[0052] As Figure 3 、 Figure 6As shown, the embedded position at the bottom of the slope drainage pipe 4 is flush with the bottom of the recycled aggregate eco-concrete layer 101, so that the water discharged from the recycled aggregate eco-concrete layers 101-102 can be further discharged to the drainage channel 9, forming a complete drainage system from the top of the slope downward. The material used for the slope drainage pipe 4 is a HDPE drainage pipe 14, both ends of which are wrapped with geotextile 112 and fixed with a hoop 15. The material used for the slope drainage pipe 5 is a HDPE hard tooth-shaped mesh permeable pipe 16, which is wrapped with two circles of geotextile 112 on the outside and fixed with a hoop 15. The lattice unit drainage pipe 6 adopts a HDPE hard tooth-shaped mesh permeable pipe 16, which is wrapped with two circles of geotextile 112 on the outside and fixed with a hoop 15, and the inside is filled with recycled coarse aggregate of earth and stone. The specification of the geotextile 112 is 400g / m 2 .

[0053] Example 2

[0054] This embodiment is a method for constructing a capillary retardation slope protection system based on recycled aggregate ecological concrete according to the present invention, comprising the following steps:

[0055] (1) Excavate and trim the slope 8, brush out a smooth slope surface, and groove the designed position of the lattice beam 1;

[0056] (2) Positioning the anchor rod 3 and the slope drainage pipe 5 according to the designed position, drilling holes for the anchor rod 3 and the slope drainage pipe 5 step by step from the top of the slope downward, then inserting the anchor rod 3 and grouting, the outer end of the anchor rod 3 is included in the lattice beam 1 after the lattice beam 1 is cast, and then installing and fixing the slope drainage pipe 5;

[0057] (3) The drainage channel 9 is excavated vertically at the foot of the slope. After the steel bars are tied and the formwork is fixed, the drainage pipe 4 at the bottom of the slope is fixed at the designed position and concrete pouring can be carried out;

[0058] (4) Tie the steel bars and fix the formwork of the lattice beam 1, first pour the recycled aggregate eco-concrete layer 102 at the bottom of the transverse skeleton beam of the lattice beam 1, and after curing for 7 days, pour the recycled aggregate concrete 18 of the rest of the lattice beam 1. The curing time after pouring shall not be less than 7 days;

[0059] (5) After the lattice beam 1 is cured, the lattice unit drainage pipe 6 is installed at the four corners of the lattice unit, and then the recycled aggregate eco-concrete layer 101 is poured. The curing time after pouring shall not be less than 7 days;

[0060] (6) After the recycled aggregate eco-concrete layer 101 is cured, a geotextile 111 is laid on top of it and fixed with iron nails; then the recycled fine-grained soil and stone layer 12 is backfilled, and it is required to be backfilled and compacted layer by layer to meet the designed compaction degree;

[0061] (7) Lay a three-dimensional vegetation net 13 on top of the reclaimed fine-grained soil layer 12 of earthwork and stonework, and fix it with J-shaped nails. Bind the overlapping parts with geotextile ropes. Finally, spray seeding of planting soil is carried out to form a vegetation layer 7, and supplementary planting, watering and other maintenance are carried out in the early stage of vegetation growth.

[0062] Working principle and process:

[0063] When rainfall occurs, rainwater forms surface runoff and flows down along the slope. After being blocked by the water retaining dams 2 on the transverse lattice beams 1, the surface runoff is diverted to the vertical lattice beams 1 and flows into the drainage channel 9 along the vertical lattice beams 1. Part of the rainwater infiltrates into the vegetation layer 7. When the rainfall duration is relatively long, the rainwater penetrates through the vegetation layer 7 and infiltrates into the earthwork regenerated fine-grained layer 12. The earthwork regenerated fine-grained layer 12 has a high degree of compaction and extremely small particle sizes, and has a strong water holding capacity, which can absorb and store a large amount of rainwater. As the rainfall time continues to increase, the rainwater will continue to infiltrate to the interface between the earthwork regenerated fine-grained layer 12 and the recycled aggregate eco-concrete layer 101. At this time, the recycled aggregate eco-concrete layer 101 is in an unsaturated state, and the permeability coefficient of the recycled aggregate eco-concrete layer 101 is smaller than that of the earthwork regenerated fine-grained layer 12. Therefore, a capillary blockage effect will occur. Under the action of this capillary blockage, the water cannot infiltrate smoothly. After accumulating at the interface, it will migrate downward along the interface and enter the recycled aggregate eco-concrete layer 102, reaching the interface between the recycled aggregate eco-concrete layer 101 and the earthwork regenerated fine-grained layer 12 of the next lattice unit, and finally being discharged layer by layer to the recycled aggregate eco-concrete layer 102 at the slope toe, and then converging to the slope bottom drain pipe 4 and discharging into the drainage channel 9. As the rainfall continues, when the matrix suction of the recycled aggregate eco-concrete layer 101 decreases to its water intake value, the permeability coefficient of the recycled aggregate eco-concrete layer 101 will increase, the capillary blockage effect will weaken, and the infiltration of water will become simpler. Eventually, its permeability coefficient will increase rapidly until it exceeds the permeability coefficient of the earthwork regenerated fine-grained layer 12. At this time, the recycled aggregate eco-concrete layer 101 will lose its blocking effect, and the water will break through and enter the recycled aggregate eco-concrete layer 101. The recycled aggregate eco-concrete layer 101 will also become a water conducting layer, guiding the rainwater layer by layer downward to the drainage channel 9. In case of extreme heavy rain weather with a large amount of rainfall in a short time, when the drainage capacity of the recycled aggregate eco-concrete layer 102 and the slope bottom drain pipe 4 is exceeded, the slope drain pipe 5 and the lattice unit drain pipe 6 can discharge the accumulated water in the lattice unit. When the rainfall ends, under the transpiration of the plants in the vegetation layer 7 and the evaporation of the atmosphere, the water inside the vegetation layer 7, the earthwork regenerated fine-grained layer 12 and the recycled aggregate eco-concrete layer 101 can be released, maintaining a relatively low moisture content of the slope 8 soil body while also creating a water storage space for the next rainfall. At the same time, the lattice unit drain pipe 6 and the recycled aggregate eco-concrete layer 101 have relatively many internal pores and can also store more water for the growth of vegetation in the dry season. In addition, the lattice unit drain pipe 6 will also become a way for gas exchange between the soil body inside the lattice unit and the outside world. As the vegetation continues to grow and the geotextile 111 ages, the vegetation roots will extend into the recycled aggregate eco-concrete layer 101 and continue to grow downward, eventually forming a new type of ecological and resilient slope.

[0064] The above are only the preferred embodiments of the present invention and do not limit the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and changes can still be made, and these improvements and changes should be regarded as within the protection scope of the present invention.

Claims

1. A capillary blockage type slope protection system based on recycled aggregate ecological concrete, which is composed of a slope, lattice beams, anchor bolts, bottom slope drain pipes, slope body drain pipes, lattice unit drain pipes, drainage channels, recycled aggregate ecological concrete layers, earth-rock recycled fine grain layers and vegetation layers, and is characterized in that: The lattice beam is cast above the slope surface. The bottom of the transverse skeleton of the lattice beam is a recycled aggregate ecological concrete layer. The anchor rods are arranged at the nodes of the lattice beam and anchored inside the slope body. One end of the slope body drain pipe is buried inside the slope body of the lattice unit, and the other end is erected on the lattice beam. The lattice unit drain pipes are arranged at the four corner points of the lattice unit. The drainage channel is arranged at the slope toe. The bottom slope drain pipe is pre-buried on the side where the drainage channel contacts the bottom slope. The covering layer inside the lattice unit is, from top to bottom, a vegetation layer, a three-dimensional vegetation net, a fine-grained layer of recycled earthwork, a geotextile, and a recycled aggregate ecological concrete layer. The aggregate used in the recycled aggregate ecological concrete layer is the coarse aggregate obtained by crushing and processing separation of engineering earthwork, with a particle size of 10 - 25 mm. The fine-grained layer of recycled earthwork is silt or silty clay obtained by crushing and processing separation of earthwork. The vegetation layer is a planting soil formed by mixing topsoil screened from earthwork with compound fertilizer and organic fertilizer, and the planting soil is sprayed on the three-dimensional vegetation net.

2. The capillary blockage type slope protection system based on recycled aggregate ecological concrete according to claim 1, wherein The lattice beam is arranged on the slope surface and consists of a transverse skeleton and a vertical skeleton of the lattice beam to form multiple lattice units, and a water retaining sill is provided at the top for guiding rainwater to drain downward along the vertical skeleton of the lattice beam.

3. The capillary-blocking slope protection system based on recycled aggregate ecological concrete according to claim 1, wherein The outer end of the anchor rod is contained inside the lattice beam after the lattice beam is cast.

4. The capillary-blocking slope protection system based on recycled aggregate ecological concrete according to claim 1, characterized in that, The vegetation layer, the fine-grained layer of recycled earthwork, and the recycled aggregate ecological concrete layer cover the inside of the lattice unit, and the sum of their thicknesses is flush with the top of the vertical skeleton of the lattice beam.

5. The capillary-blocking slope protection system based on recycled aggregate ecological concrete according to claim 1, characterized in that The thickness of the recycled aggregate eco-concrete layer inside the lattice unit is 50 mm to 100 mm, the thickness of the recycled aggregate eco-concrete layer at the bottom of the transverse skeleton of the lattice beam is 50 mm to 150 mm, the porosity of the recycled aggregate eco-concrete layer is 21% to 30%, the water permeability coefficient is not less than 1×10 -3 m / s, the compressive strength is not less than 15 MPa, and the pH value is 8 to 10.

6. The capillary-blocking type slope protection system based on recycled aggregate ecological concrete according to claim 1, characterized in that, The earthwork and stonework recycled fine-grained layer has a thickness of 150 mm to 300 mm, a compaction degree of not less than 90%, and a saturated permeability coefficient of 1×10 -8 m / s to 1×10 -6 m / s. The earthwork and stonework recycled fine-grained layer covers the recycled aggregate ecological concrete layer, and there is a layer of geotextile between them. The specification of the geotextile is 150 g / m 2 to 200 g / m 2 .

7. The capillary-blocking type slope protection system based on recycled aggregate ecological concrete according to claim 1, characterized in that, The three-dimensional vegetation net is laid on the surface of the fine-grained layer of recycled earthwork and fixed with J-shaped nails. The thickness of the vegetation layer is 100 mm - 150 mm.

8. The capillary-blocking type slope protection system based on recycled aggregate ecological concrete according to claim 1, characterized in that, The pre-buried position at the bottom of the bottom slope drain pipe is flush with the bottom of the recycled aggregate ecological concrete layer.

9. The capillary-blocking slope protection system based on recycled aggregate ecological concrete according to claim 1, characterized in that, The material used for the bottom slope drain pipe is an HDPE drain pipe, and both ends are wrapped with geotextile and fixed with hoop rings. The material used for the slope body drain pipe is an HDPE corrugated mesh permeable pipe, and the outside is wrapped with two layers of geotextile and fixed with hoop rings. The lattice unit drain pipes are pre-made of HDPE corrugated mesh permeable pipes, the outside is wrapped with two layers of geotextile and fixed with hoop rings, and the inside is filled with recycled coarse aggregate of earthwork.

10. The construction method of the capillary barrier type slope protection system based on recycled aggregate ecological concrete according to claim 1 includes the following steps: (1) Excavate and trim the slope surface to brush out a flat slope surface, and groove the designed position of the lattice beam; (2) Position the anchor rods and the slope body drain pipes according to the designed positions, gradually drill the anchor rod holes and the pipe holes of the slope body drain pipes from the top of the slope downwards, then insert the anchor rods and grout. When the lattice beam is cast, the anchor rods are contained inside the lattice beam, and then install and fix the slope body drain pipes; (3) Vertically excavate the drainage channel at the slope toe. After steel bar binding and formwork fixing, fix the bottom slope drain pipe at the designed position and then concrete can be poured; (4) Carry out steel bar binding and formwork fixing of the lattice beam. First, pour the recycled aggregate ecological concrete layer at the bottom of the transverse skeleton beam of the lattice beam. After curing for several days, pour the recycled aggregate concrete of the remaining part of the lattice beam. The curing time after pouring shall not be less than 7 days; After the lattice girder is cured, place the drain pipes of the lattice unit at the four corner points of the lattice unit, and then pour the recycled aggregate ecological concrete layer. The curing time after pouring shall not be less than 7 days; After the recycled aggregate ecological concrete layer is cured, lay geotextile on it and fix it with iron nails, and then cover it with the recycled fine-grained soil layer of the earthwork. It is required to backfill and compact layer by layer to meet the design compaction degree; Lay a layer of three-dimensional vegetation net on the recycled fine-grained soil layer of the earthwork, fix it with J-shaped nails, tie the overlapping parts with geotextile ropes, and finally spray the planting soil to form a vegetation layer, and replant and sprinkle water for maintenance in the early stage of vegetation growth.

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