Multifunctional composite waterproof blanket suitable for roadbed engineering

Abstract

The invention discloses a multifunctional composite waterproof blanket suitable for roadbed engineering. The multifunctional composite waterproof blanket sequentially comprises anti-skid convex strips, a first waterproof layer, a leakage monitoring layer, a second waterproof layer, a water guide and drainage layer, a protection layer, a drainage line and anti-skid protrusions from top to bottom. The waterproof layer is formed by uniformly mixing super-hydrophobic soil and fibers and then clamping and sealing the mixture between two layers of non-woven geotechnical cloth according to a preset compaction degree; the water guide and drainage layer is composed of an upper layer of high-suction geotextile, water absorption and drainage yarn and a lower layer of permeable geotextile. The multifunctional composite waterproof blanket suitable for the roadbed engineering is used for solving the problems that an existing waterproof blanket cannot effectively block the migration path of water and rapidly discharge water accumulated in a roadbed in the water-rich roadbed engineering, and meanwhile, the situation of water leakage and waterproof material damage cannot be monitored in real time, so that roadbed diseases occur frequently and deterioration is accelerated; and the engineering waterproof and drainage quality is difficult to guarantee.

Description

TECHNICAL FIELD

[0001] The present scheme belongs to the technical field of waterproof blankets, and specifically relates to a multifunctional composite waterproof blanket suitable for water-rich roadbed engineering. BACKGROUND

[0002] In roadbed engineering, the migration and accumulation of water in the soil body increase the water content and humidity inside the roadbed, seriously affecting the strength and deformation characteristics of the roadbed, leading to instability and damage of the roadbed, cracking of the road surface, and local collapse and other engineering diseases. Therefore, controlling the water content of the roadbed soil body, intelligently monitoring the water leakage and damage of the waterproof blanket, and blocking the migration path of groundwater from the water-rich stratum to the roadbed are of great significance for controlling roadbed diseases and ensuring the safety and smoothness of the line.

[0003] At present, the widely used waterproof blankets in roadbed engineering are bentonite waterproof blankets (GCL) and composite geomembranes ("two cloths and one membrane"). The bentonite waterproof blanket is a blanket-shaped waterproof material made by uniformly fixing sodium-based bentonite particles or powder between two layers of geotextile through needling, gluing and other processes. Generally, bentonite waterproof blankets can only exhibit excellent impermeability in fresh water or deionized water, and when applied in complex environments, their swelling index and viscosity will be greatly reduced, the permeability coefficient will increase, and the impermeability will not meet the requirements. Due to its own properties, it also has the defects of poor peelability, reduced shear strength after hydration, uneven expansion and damage caused by hydration and swelling reaction when encountering water before or during installation, etc. In addition, the composite geomembrane will produce "pot cover effect" due to its own structure, causing water to accumulate near the water barrier layer, and being easily affected by creep caused by bubbles, puncture, rupture and degradation, resulting in a significant decrease in the waterproof and impermeability of the water barrier layer. In addition, the commonly used drainage geosynthetic material can only exhibit good drainage effect in saturated soil, and cannot drain water in unsaturated soil, and cannot eliminate roadbed diseases. SUMMARY

[0004] In view of the above shortcomings of the prior art, the present application aims to provide a multifunctional composite waterproof blanket suitable for roadbed engineering, which uses super-hydrophobic soil with excellent waterproof and impermeability as the core waterproof material of the waterproof layer, and combines a leakage monitoring layer, a drainage layer and other additional layers to form a blanket for engineering application.

[0005] To achieve the above technical purposes, the multifunctional composite waterproof blanket provided by the present application comprises, from top to bottom, anti-skid protrusions, a first waterproof layer, a leakage monitoring layer, a second waterproof layer, a water guide layer, a protection layer, a hydrophobic line and anti-skid protrusions; the first waterproof layer has anti-skid protrusions, the first waterproof layer and the second waterproof layer sandwich modified soil with a preset compaction degree between two layers of non-woven geotextiles, the modified soil is formed by uniformly mixing super-hydrophobic soil and fibers, the leakage monitoring layer is formed by non-metallic conductive geotextile, the upper surface of the leakage monitoring layer is bonded to the lower surface of the first waterproof layer, and the lower surface of the leakage monitoring layer is bonded to the upper surface of the second waterproof layer, the water guide layer is formed by an upper layer of high-suction geotextile, water absorption and drainage yarn and a lower layer of water-permeable geotextile, the weft of the high-suction geotextile is formed by a polyester wicking yarn with a special cross-section and a reinforced polyester filament, and the high-suction geotextile is woven into a whole by the warp of the polyester filament, the water absorption and drainage yarn is formed by twisting a plurality of polyester yarns with nanofibers attached to the surface, each polyester yarn is formed by interlacing polyester wicking fibers, and the surface of the polyester wicking fibers has micron-level grooves in the axial direction, the protection layer is prepared by filling a plurality of natural soil particles between the lower layer of water-permeable geotextile and the non-woven geotextile layer, and the protection layer has anti-skid protrusions below, the first waterproof layer is sewn with the two layers of non-woven geotextiles and the modified soil by the hydrophobic line, and the second waterproof layer, the water guide layer and the protection layer are sewn into one body by the hydrophobic line.

[0006] In an embodiment of the above technical solution, the anti-skid protrusions are prepared by filling the hollow rubber strip with EVA foam material.

[0007] In an embodiment of the above technical solution, the anti-skid protrusions are in the form of spikes.

[0008] In an embodiment of the above technical solution, the hydrophobic line is prepared by immersing or coating high-strength nylon wire with a hydrophobic solution and then drying or curing.

[0009] In an embodiment of the above technical solution, the proportion of the polyester wicking fibers in the high-suction geotextile is not less than 25%, and the spacing distance between the weft polyester wicking fiber bundles is not less than 5mm.

[0010] The use method of any one of the above multifunctional composite waterproof blankets is as follows: when the waterproof blanket is laid, the weft polyester wicking yarn with water absorption and drainage function in the water guide layer is consistent with the cross-sectional direction of the roadbed, and the two ends of the water guide layer are exposed by a preset length of the roadbed.

[0011] The beneficial technical effects of the scheme are: the waterproof blanket of the scheme is especially suitable for water-rich strata, can effectively block the recharge of groundwater in water-rich strata to the roadbed, block the migration path of water, and at the same time, quickly discharge the water accumulated in the roadbed, prevent the occurrence of "pot cover effect", and ensure that the roadbed soil is in a low water content state for a long time. Moreover, the composite waterproof blanket can monitor the water leakage and damage of the waterproof blanket in real time in the roadbed engineering, accurately locate the leakage point, ensure the performance of the waterproof blanket in the whole life cycle, effectively inhibit the expansion and deterioration of the roadbed disease, and prolong the service life of the roadbed. BRIEF DESCRIPTION OF DRAWINGS

[0012] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0013] Figure 1 It is a structural diagram of the waterproof blanket in an embodiment.

[0014] Figure 2 It is a schematic diagram of the water guide and drainage layer in an embodiment.

[0015] Figure 3 It is a schematic diagram of the anti-skid convex strip / protrusion in an embodiment. DETAILED DESCRIPTION

[0016] Based on the background art, the existing waterproof and drainage materials are difficult to maintain good waterproof and drainage performance in water-rich roadbed engineering, cannot effectively block the migration path of water and quickly discharge the water accumulated in the roadbed in time, and at the same time, cannot monitor the water leakage and damage of the waterproof material in real time, resulting in frequent occurrence of roadbed diseases and accelerated deterioration, and the quality of engineering waterproof and drainage is difficult to guarantee.

[0017] Based on this, the present scheme proposes a multifunctional composite waterproof blanket suitable for water-rich roadbed engineering. The waterproof blanket can effectively control the water content in the roadbed and monitor the water leakage and damage of the waterproof blanket in real time, and ensure that the roadbed soil is in a dry state or a low water content state for a long time. Of course, the waterproof blanket of the present scheme is also suitable for other roadbeds.

[0018] The technical solutions of the present case will be described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present case, not all the embodiments. Based on the embodiments in the present case, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0019] Reference Figure 1The waterproof blanket structure shown from top to bottom includes: anti-skid convex strip 1, first waterproof layer 3-1, leakage monitoring layer 4, second waterproof layer 3-2, water guide layer 5, protective layer 6, hydrophobic line 7 and anti-skid convex 8. Each layer is introduced in detail below.

[0020] (1) Anti-skid convex strip 1 A plurality of anti-skid convex strips 1 are arranged on the upper surface of the waterproof blanket body. The anti-skid convex strip 1 is made of a hollow rubber strip 1-1 filled with EVA foam material 1-2. The two work together, as shown in the left side of the figure. Figure 3 The arrangement interval of the anti-skid convex strip 1 can be equal or unequal.

[0021] The anti-skid convex strip 1 has excellent cushioning performance and shock resistance. The arrangement of the anti-skid convex strip can increase the friction coefficient, ensure that the main surface is protected while providing stable friction to the soles of the workers, and improve the safety of construction.

[0022] (2) Non-woven geotextile 2 The non-woven geotextile 2 is made of polypropylene fibers, with a unit area mass ≥200g / m 2 It has excellent tensile strength and durability, can effectively fix and isolate the filled super-hydrophobic soil particles, prevent the loss of super-hydrophobic soil particles and mixing with the surrounding soil, and ensure the long-term stable waterproof effect of the waterproof blanket.

[0023] (3) Modified soil waterproof layer 3 The modified soil waterproof layer 3 is divided into first waterproof layer 3-1 and second waterproof layer 3-2, which is composed of modified soil with a certain compaction degree sandwiched between two layers of non-woven geotextile 2. It can solve the problems of existing sodium bentonite waterproof blanket, such as poor peeling property, reduced shear strength after hydration, linear hole leakage, uneven expansion and damage caused by hydration swelling reaction when encountering water before or during installation, etc., thereby destroying or failing the integrity of the impermeable system. The modified soil is uniformly mixed with super-hydrophobic soil and fibers.

[0024] ① Super-hydrophobic soil The super-hydrophobic soil is a new type of waterproof material with excellent waterproof and impermeable performance, which is prepared by mixing natural soil (natural soil or engineering waste soil) with hydrophobic modifier (existing hydrophobic agent on the market). For example, the product uses CN01C soil super-hydrophobic emulsion as a hydrophobic agent. Only need to mix the emulsion into the soil sample according to the best concentration and optimal hydrophobic agent content, mix it thoroughly, and wait for the modified soil sample to dry.

[0025] The super-hydrophobic soil is not limited to the above-mentioned method or hydrophobic agent for preparation, and any hydrophobic agent on the market or any hydrophobic agent researched can be used, such as polydimethylsiloxane (PDMS), octadecyl primary amine, and SHOIP (super-hydrophobic high polymer) hydrophobic material. The final purpose is to modify the soil from hydrophilic to super-hydrophobic, present the extreme water-repellent characteristics like the lotus effect, and realize zero permeation of the waterproof layer. The super-hydrophobic soil has a particle size of 5-50 μm, a static contact angle with water of ≥150°, and a rolling angle of ≤10°.

[0026] ②Fiber The fiber is at least selected from one of basalt fiber, polypropylene fiber, polyvinyl alcohol (PVA) fiber, and sisal fiber. After the fiber is uniformly mixed into the super-hydrophobic soil, the fiber will generate friction and occlusion with the soil, and a plurality of fibers form a three-dimensional network structure to constrain and fix the super-hydrophobic soil particles, prevent the movement of the super-hydrophobic soil particles, and improve the integrity and physical and mechanical properties of the soil.

[0027] (4) Leakage monitoring layer 4 The non-metallic conductive geotextile of the leakage monitoring layer 4 has excellent electrical properties and chemical corrosion resistance, can monitor water leakage and waterproof blanket damage in real time through the change of the resistance of the conductive geotextile, accurately locate the leakage point, ensure the performance of the waterproof blanket in the whole life cycle, avoid the occurrence of diseases due to the damage of the roadbed waterproof layer, and prolong the service life of the roadbed.

[0028] In an embodiment, the non-metallic conductive geotextile is made of non-metallic conductive fibers and ordinary fibers. The non-metallic conductive fibers are prepared by adding one or more combinations of carbon nanotubes, graphene, and superconducting carbon black to high molecular polymers. The addition amount of the non-metallic conductive fibers of the leakage monitoring layer 4 is 35%-100%, and the surface resistivity is <1×10 5 Ω•m. The leakage monitoring layer 4 is fixed between the upper and lower modified soil waterproof layers by adhesion.

[0029] (5) Water guiding and draining layer 5 As shown in Figure 2 The water guiding and draining layer 5 is composed of an upper high-suction geotextile 5-1, water absorbing and draining yarns 5-2, and a lower water-permeable geotextile 5-3.

[0030] ①High-suction geotextile 5-1 The weft direction of the high-suction geotextile 5-1 is composed of a polyester wicking yarn with a special cross-section and a reinforced polyester filament, and the whole is woven by the warp direction of the polyester filament.

[0031] In an embodiment, two polyester wicking yarns are arranged between a polyester filament, and are woven with the regular arrangement of the polyester filament in the warp and weft directions, and the filament fibers are arranged in the warp and weft directions to form a force skeleton, which plays a reinforcing role, and the polyester wicking yarns rely on the capillary force generated by the micron-level fiber grooves to play a water absorption and drainage role.

[0032] In an embodiment, the proportion of the polyester wicking fiber in the high-suction geotextile 5-1 should not be less than 25%, and the spacing distance between the weft polyester wicking fiber bundles should not be less than 5 mm, so as to ensure the water absorption and drainage performance of the high-suction geotextile 5-1.

[0033] The high-suction geotextile 5-1 is a transverse drainage geotextile, and the weft polyester wicking yarns with water absorption and drainage function are consistent with the cross-sectional direction of the roadbed when laid.

[0034] ② Water absorption and drainage yarn 5-2 The water absorption and drainage yarn 5-2 is formed by plying several polyester yarns with attached nanofibers on the surface, which can achieve good water absorption and drainage capacity. Each polyester yarn is formed by interweaving polyester wicking fibers, and the surface of the polyester wicking fiber has micron-level grooves in the axial direction. The cross-sectional shape of the wicking fiber has a larger specific surface area and capillary force, and the grooves on the surface can form drainage channels with a diameter smaller than the gap between soil particles, thereby producing a wicking effect to absorb water in unsaturated soil and drain water along the drainage grooves or pipes.

[0035] The nanofiber is formed by electrospinning technology, which uses a strong electric field to stretch and refine the polyacrylonitrile (PAN) melt, and has a more microscopic pore structure feature, which exhibits better hydrophilic and hygroscopic properties in a macroscopic sense. The nanomaterial is coated on each polyester yarn, and the thickness of the single coating is 1 / 6 of the cross-sectional size of the polyester yarn. The drainage channel of the water absorption and drainage yarn 5-2 should be placed transversely in the roadbed, consistent with the cross-sectional direction of the roadbed.

[0036] In an embodiment, the polyester yarn is formed by interweaving polyester wicking fibers, and the diameter is about 1 mm; the cross-sectional diameter of each wicking fiber is about 10 μm, and four deep grooves exist in the surface axial direction, and the diameter of each groove is about 5 μm.

[0037] ③ Water-permeable geotextile 5-3 The water-permeable geotextile 5-3 has good water permeability and filtration, and the unit area mass should be not less than 200 g / m 2 .

[0038] It should be noted that the above-mentioned polyester wicking fiber involved in the high-suction geotextile, the spacing distance between the weft polyester wicking fiber bundles, the diameter of the polyester yarn, the cross-sectional diameter of the wicking fiber, the number of grooves, the groove diameter, the nano material coating thickness, and the mass of the water permeable geotextile can be adaptively changed under the premise of achieving the same purpose or improving the corresponding technical effect.

[0039] The leakage monitoring layer 4 can realize real-time monitoring of water leakage and waterproof blanket damage in roadbed engineering, accurately locate the leakage points, and ensure the performance of the waterproof blanket throughout its life cycle. The first waterproof layer 3-1 and the second waterproof layer 3-2 effectively block the migration path of water, and the drainage layer 5 quickly drains the accumulated water in the roadbed, preventing the occurrence of "pot cover effect", effectively inhibiting the expansion and deterioration of roadbed diseases, improving the quality of engineering waterproof and drainage, and prolonging the service life of the roadbed. The protective layer can avoid damage to the main body of the waterproof blanket.

[0040] (6) Protective layer 6 The protective layer 6 is prepared by filling a plurality of natural soil particles between the lower water permeable geotextile 5-3 and the non-woven geotextile layer 2. The natural soil particles can be natural soil or engineering waste soil, wherein at least one of silt, silty sand, or silty clay is used.

[0041] By setting the protective layer 6 at the lower part of the waterproof blanket body, the protective layer 6 can separate the waterproof blanket body from the base, avoiding the protruding gravel and other debris on the pavement layer from tearing the waterproof blanket body and affecting the waterproof effect of the waterproof blanket body.

[0042] (7) Hydrophobic line 7 In order to facilitate the engineering application and transportation of the waterproof blanket, other layers need to be combined into one body to form a blanket shape through sewing and other processes. In order to effectively prevent water from leaking along the line holes and sewing lines, in an embodiment, hydrophobic line 7 is used for sewing. The hydrophobic line 7 is prepared by immersing or coating a high-strength nylon wire with a hydrophobic solution and then drying or curing. The hydrophobic agent can firmly adhere to the surface of the wire, forming a high-strength sewing line with excellent waterproof performance.

[0043] In an embodiment, the first waterproof layer 3-1 uses hydrophobic line 7 to sew two layers of non-woven geotextile 2 and modified soil. The second waterproof layer 3-2, the drainage layer 5, and the protective layer 6 are sewn together using hydrophobic line 7.

[0044] (8) Anti-slip protrusions 8 A plurality of sharp nail-shaped anti-slip protrusions 8 are provided on the lower surface of the protective layer 6. The sharp nail-shaped anti-slip protrusions 8 can be inserted into the pavement layer, allowing the waterproof blanket to be better fixed and combined with the pavement base, increasing the overall friction of the waterproof blanket, and improving the contact stability of the contact surface. The anti-slip protrusions 8 can be equally spaced or unequally spaced.

[0045] In one embodiment, the spikes are in the shape of a rhombus, as shown in the right side of the figure. Figure 3

[0046] Figure 1 One way of using the waterproof blanket shown in the structure is to lay the waterproof blanket parallel to the roadbed in the direction of the water-absorbing and draining yarns 5-2 at a certain depth, with the waterproof part facing up and the drainage part facing down. When the waterproof blanket is laid, the two ends of the water guide and drainage layer 5 are exposed from the roadbed by a predetermined length, and are exposed to the air for water evaporation. In use, the water-absorbing and draining yarns 5-2 in the water guide and drainage layer 5 will rely on their high capillary force characteristics to continuously absorb water under capillary action and drain it out of the soil outside the internal micro-grooves or pipes, ensuring that the roadbed soil is in a low water content state for a long time, solving a series of disease problems caused by changes in the water content of the roadbed.

[0047] In the above use, the construction method of the multifunctional composite waterproof blanket of the roadbed is briefly described as follows: (1) clearing the roots, stones, and sharp objects such as iron wires in the laying base to avoid damage to the composite waterproof blanket caused by external factors; (2) compacting and leveling the laying base to ensure that the base is tight and uniform, and the soil is solid without obvious bumps (such as bumps with a height greater than the predetermined height); (3) laying the roadbed composite waterproof blanket on the surface of the base and inserting the anti-skid protrusions 8 into the laying base to better fix and combine the waterproof blanket with the laying base, and at the same time, exposing the ends of the water guide and drainage layer 5 by a certain length on both sides of the roadbed.

[0048] In one embodiment, the waterproof blanket has a first waterproof layer 3-1, a leakage monitoring layer 4, a second waterproof layer 3-2, a water guide and drainage layer 5, and a protective layer 6. Compared with other waterproof materials that only have a single function of water resistance or drainage, the waterproof blanket is a multifunctional composite waterproof blanket, which has the first waterproof layer 3-1, the leakage monitoring layer 4, the second waterproof layer 3-2, and the water guide and drainage layer 5, making it have the functions of actively draining excess water in the unsaturated roadbed, efficiently blocking water intrusion, and monitoring water content in the full cross-section of the roadbed, and the protective layer 6 can prevent damage to the main body of the waterproof blanket.

[0049] In one embodiment, the waterproof blanket can be composed of the first waterproof layer 3-1, the leakage monitoring layer 4, and the second waterproof layer 3-2. Depending on the laying environment, there is a protective layer 6 or no protective layer 6. In this embodiment, the waterproof blanket is used for isolation and leakage monitoring above or below.

[0050] In one embodiment, the waterproof blanket can only have the water guide and drainage layer 5, and depending on the laying environment, there is a protective layer 6 or no protective layer 6. In use, the laying direction of the water guide and drainage layer 5 is determined according to the use scenario. In this embodiment, through the water guide and drainage function of the waterproof blanket, the water content of the laying site is controlled. ​

[0051] In one embodiment, the waterproof blanket can be used in a channel waterproofing project. The waterproof blanket can have one or more layers of modified soil waterproofing layer, which is laid on the underside of the water channel surface lining, uniformly laid along the longitudinal direction of the channel, and for the transverse laying, the length should be able to fully lay in the cross section of the channel. In this embodiment, the waterproof blanket can effectively block the seepage channel of water from the channel to the surrounding foundation, avoiding the problem of water source leakage in long distance water conveyance projects.

[0052] Embodiments of the application have been described above, the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes are obvious to those skilled in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles, practical applications, or technical improvements in the market of the embodiments, or to enable other ordinary skilled in the art to understand the embodiments disclosed herein. The scope of the present application is defined by the appended claims.

Claims

1. A multifunctional composite waterproof blanket, characterized in that: the waterproof blanket comprises, from top to bottom, anti-skid protrusions, a first waterproof layer, a leakage monitoring layer, a second waterproof layer, a drainage layer, a hydrophobic line, and anti-skid protrusions; the first waterproof layer has anti-skid protrusions; the first waterproof layer and the second waterproof layer are formed by sandwiching modified soil with a preset compaction degree between two layers of non-woven geotextiles; the modified soil is formed by uniformly mixing super-hydrophobic soil and fibers; the leakage monitoring layer is formed by a non-metallic conductive geotextile, and the upper surface of the leakage monitoring layer is bonded to the lower surface of the first waterproof layer, and the lower surface of the leakage monitoring layer is bonded to the upper surface of the second waterproof layer; the drainage layer is formed by an upper layer of high-suction geotextile, water-absorbing and draining yarn, and a lower layer of water-permeable geotextile; the weft of the high-suction geotextile is formed by a polyester wicking yarn with a special cross-section and a reinforced polyester filament, and the high-suction geotextile is woven into a whole by the warp of the polyester filament; the water-absorbing and draining yarn is formed by twisting a plurality of polyester yarns with nanofibers attached to the surface; each polyester yarn is formed by interlacing polyester wicking fibers; and the surface of the polyester wicking fibers has micron-level grooves in the axial direction; the protection layer is formed by filling a plurality of natural soil particles between the lower layer of water-permeable geotextile and the non-woven geotextile layer; and the protection layer has anti-skid protrusions. The first waterproof layer is stitched by the hydrophobic line to connect the two layers of non-woven geotextiles and the modified soil; and the second waterproof layer, the drainage layer, and the protection layer are stitched by the hydrophobic line to form an integrated body. The anti-skid protrusions are formed by filling EVA foam material in the hollow rubber strip. The anti-skid protrusions are in the shape of sharp nails. The hydrophobic line is formed by immersing or coating high-strength nylon wire in a hydrophobic solution and then drying or curing the hydrophobic solution. The proportion of the polyester wicking fibers in the high-suction geotextile is not less than 25%, and the interval distance between the weft of the polyester wicking fibers is not less than 5 mm. During the laying of the waterproof blanket, the weft of the polyester wicking yarn with water-absorbing and draining functions in the drainage layer is aligned with the cross-sectional direction of the roadbed, and the two ends of the drainage layer are exposed by a preset length of the roadbed.

2. The multifunctional composite waterproof blanket according to claim 1, characterized in that, 7.A multifunctional composite waterproof blanket, characterized in that: the waterproof blanket comprises, from top to bottom, a first waterproof layer, a leakage monitoring layer, a second waterproof layer, a drainage layer, and a protection layer; the drainage layer is formed by an upper layer of high-suction geotextile, water-absorbing and draining yarn, and a lower layer of water-permeable geotextile; the weft of the high-suction geotextile is formed by a polyester wicking yarn with a special cross-section and a reinforced polyester filament, and the high-suction geotextile is woven into a whole by the warp of the polyester filament; the water-absorbing and draining yarn is formed by twisting a plurality of polyester yarns with nanofibers attached to the surface; each polyester yarn is formed by interlacing polyester wicking fibers; and the surface of the polyester wicking fibers has micron-level grooves in the axial direction; and the protection layer is formed by filling a plurality of natural soil particles between the lower layer of water-permeable geotextile and the non-woven geotextile layer.

3. The multifunctional composite waterproof blanket according to claim 1, characterized in that, 8.A waterproof blanket, characterized in that:

4. The multifunctional composite waterproof blanket according to claim 1, characterized in that, ​ 5. The multifunctional composite waterproof blanket according to claim 1, wherein ​ 6. A method of using the multifunctional composite waterproof blanket according to any one of claims 1 to 5, characterized in that, ​ ​ ​ ​ ​ ​ The waterproof blanket comprises a water drainage layer, which is composed of an upper high-suction geotextile, a water-absorbing and draining yarn and a lower water-permeable geotextile, the weft of the high-suction geotextile is composed of a polyester wicking yarn with a special-shaped section and a reinforced polyester filament, and the high-suction geotextile is knitted into a whole by the warp of the polyester filament, the water-absorbing and draining yarn is composed of several polyester yarns with nanofibers attached to the surface, each polyester yarn is formed by interlacing polyester wicking fibers, and the surface of the polyester wicking fibers is axially provided with micron-level grooves.

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