Combined structure for geomembrane supporting layer
By optimizing the material selection and construction process of the combined structure, the problems of flatness and drainage capacity of the geomembrane support layer were solved, achieving a high-efficiency and economical seepage prevention effect, which is suitable for the application of geomembrane support layers.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-05
- Publication Date
- 2026-03-10
AI Technical Summary
Traditional geomembranes suffer from insufficient flatness of the support layer and poor drainage capacity, leading to increased risk of leakage, high construction costs, and extended construction periods.
A combination structure consisting of a transition layer, a bedding layer, a reverse filter layer, and a composite drainage net layer is adopted. Combined with optimized material selection and construction technology, it replaces the traditional fine sand layer, ensuring flatness and improving drainage performance.
It improves engineering reliability, reduces construction costs, shortens the construction period, enhances drainage capacity, extends service life, and adapts to high water head conditions.
Smart Images
Figure CN223984035U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of geotechnical seepage prevention technology, and in particular to a combined structure for a geomembrane support layer. Background Technology
[0002] In geomembrane seepage control systems, the design and construction quality of the support layer directly affect the service life and seepage control effect of the geomembrane.
[0003] Traditional support layers typically use fine sand as a fine protective material. However, because fine sand cannot be effectively compacted, it easily forms an uneven structural surface after construction. This results in the geomembrane not being effectively supported in the recessed areas after water is stored, leading to stress concentration, increasing the risk of puncture and bursting, and causing leakage problems.
[0004] In addition, traditional geomat drainage materials have limited drainage capacity and cannot meet the drainage needs under high water head conditions.
[0005] To address the aforementioned issues, existing technologies often employ methods such as increasing the thickness of the fine sand layer or introducing auxiliary drainage facilities. However, these methods frequently lead to increased construction costs and extended construction periods, and fail to fundamentally resolve the problem of insufficient flatness in the fine sand layer. Therefore, a novel support layer structure is urgently needed that can both ensure the flatness of the support layer and improve drainage performance. Utility Model Content
[0006] To overcome the above problems, the purpose of this utility model is to provide a combined structure for geomembrane support layers, including a transition layer, a cushion layer, a filter layer, and a composite drainage net layer. This combined structure solves the problems of insufficient flatness and poor drainage capacity of traditional fine sand layers by optimizing material selection and construction technology, while reducing construction costs and improving project reliability.
[0007] The technical solution adopted in this utility model is:
[0008] A composite structure for a geomembrane support layer includes a transition layer, a cushion layer, a filter layer, and a composite drainage net layer. The transition layer is located at the bottom of the composite structure, the cushion layer is located above the transition layer, the filter layer is located above the cushion layer, the composite drainage net layer is located above the filter layer, and a geomembrane layer is laid on top of the composite drainage net layer. The geomembrane layer is made of high-density polyethylene geomembrane with a thickness ≥1.5mm.
[0009] As a further description of this utility model, the transition layer is made of weakly weathered, slightly weathered, fresh stone, the thickness of the transition layer is 160cm, the maximum particle size of the transition layer stone is 300mm, the content of particles smaller than 5mm is controlled in the range of 5%-20%, the porosity is ≤18%, and it allows for free drainage.
[0010] As a further description of this utility model, the raw material of the transition layer is obtained by a graded continuous method. During the filling construction, particle separation should be avoided during unloading and spreading. After appropriate watering, a 26t vibratory roller is used for compaction, and the number of compaction times is 8. After compaction, its deformation modulus is not less than 40 MPa.
[0011] As a further description of this utility model, the cushion layer is a freshly rolled product, with a thickness of 48-52 cm, a maximum particle size of 20 mm, and the content of particles smaller than 5 mm controlled within the range of 28%-40%. The porosity is ≤17%, and the permeability coefficient is [missing information]. .
[0012] As a further description of this utility model, the raw material of the cushion layer is obtained by aggregate gradation. During the filling construction, particle separation should be avoided during unloading and spreading. After appropriate watering, it is compacted by a 26t vibratory roller for 8 times. After compaction, its deformation modulus is not less than 40MPa.
[0013] As a further description of this utility model, the filter material layer is made by manual rolling of fresh finished products, the thickness of the filter material layer is 12-16cm, the raw material of the filter material layer is obtained by aggregate gradation, the particle size of the filter material layer is ≤2cm, the non-uniformity coefficient Cu is 5-8, the curvature coefficient Cc is 1-3, and the permeability coefficient is ≥1×10⁻³cm / s.
[0014] As a further description of this utility model, the filter material layer is laid and compacted using a road paver. Before compaction, other materials are removed to keep the filter material layer moist. A 20t vibratory roller is used for compaction, with six compaction passes. After compaction, the flatness is ensured to be ≤ [missing information - likely a specific value]. The compaction degree is ≥95%.
[0015] As a further description of this utility model, the composite drainage net layer is composed of two layers of non-woven geotextile and one layer of three-dimensional mesh core material. The core opening rate is ≥80%, the compressive strength is ≥50kN / m², the unit area mass of the non-woven geotextile is ≥200g / m², the puncture strength is ≥3.5kN, and the planar water conductivity is ≥0.003m² / s.
[0016] As a further description of this utility model, the three-dimensional mesh core material is made of polypropylene and is suitable for environments with pH 2-13.
[0017] The beneficial effects of this utility model are:
[0018] This utility model discloses a combined structure for a geomembrane support layer, comprising a transition layer, a cushion layer, a filter material layer, and a composite drainage net layer. The transition layer is located at the bottom of the combined structure, the cushion layer is located above the transition layer, the filter material layer is located above the cushion layer, and the composite drainage net layer is located above the filter material layer. This combined structure solves the problems of insufficient flatness and poor drainage capacity of traditional fine sand layers by optimizing material selection and construction technology, while reducing construction costs and improving project reliability.
[0019] This utility model discloses a combined structure for geomembrane support layers. It replaces fine sand by combining a transition layer, a cushion layer, a filter layer, and a composite drainage net layer, and is constructed using a road paver to ensure the support layer's flatness is ≤ [missing information]. This optimizes project investment while effectively avoiding the risks of rupture and tearing caused by uneven stress on the geomembrane.
[0020] This utility model discloses a combined structure for a geomembrane support layer. The planar water conductivity of the composite drainage net layer is increased by 650% compared with that of traditional geomat. Combined with the overall layered drainage function of the lower support layer, the drainage capacity is significantly improved, the drainage performance is enhanced, and it is suitable for high water head conditions.
[0021] This utility model discloses a combined structure for a geomembrane support layer. The cushion layer and the filter layer are made from fresh finished products obtained by manual rolling. By using local materials, material costs are saved, construction efficiency is increased by 466%, the construction period is significantly shortened, and construction efficiency is greatly improved. At the same time, the overall project investment is reduced, resulting in significant economic benefits.
[0022] This utility model discloses a combined structure for a geomembrane support layer. The three-dimensional mesh core material is made of polypropylene, which has chemical corrosion resistance, is suitable for environments with pH 2-13, and extends the system service life to the design standard of 50 years. Attached Figure Description
[0023] Figure 1 This is a schematic diagram of a combined structure for a geomembrane support layer proposed in this utility model.
[0024] Explanation of reference numerals in the attached figures
[0025] 1-Transition layer,
[0026] 2-Subbase layer,
[0027] 3-Filter media layer,
[0028] 4-Composite drainage mesh layer,
[0029] 5-Geomembrane layer. Detailed Implementation
[0030] The specific embodiments of this utility model are described below with reference to the accompanying drawings and examples:
[0031] It should be noted that the structures, proportions, sizes, etc. shown in the accompanying drawings are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the implementation conditions of this utility model. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and purposes that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.
[0032] Meanwhile, the terms such as "upper", "lower", "left", "right", "middle" and "one" used in this specification are only for clarity of description and are not intended to limit the scope of implementation of this utility model. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered as within the scope of implementation of this utility model.
[0033] like Figure 1 As shown, it illustrates a specific embodiment of this utility model:
[0034] Example 1
[0035] A composite structure for a geomembrane support layer includes a transition layer 1, a cushion layer 2, a filter layer 3, and a composite drainage net layer 4. The transition layer 1 is located at the bottom of the composite structure, the cushion layer 2 is located above the transition layer 1, the filter layer 3 is located above the cushion layer 2, the composite drainage net layer 4 is located above the filter layer 3, and a geomembrane layer 5 is laid on top of the composite drainage net layer 4. The geomembrane layer 5 is made of high-density polyethylene geomembrane with a thickness ≥1.5mm.
[0036] In this embodiment, as Figure 1 As shown, the combined structure includes a transition layer 1, a cushion layer 2, a reverse filter layer 3, and a composite drainage net layer 4. The transition layer 1 is located at the bottom of the combined structure, the cushion layer 2 is located above the transition layer 1, the reverse filter layer 3 is located above the cushion layer 2, and the composite drainage net layer 4 is located above the reverse filter layer 3. This combined structure solves the problems of insufficient flatness and poor drainage capacity of traditional fine sand layers by optimizing material selection and construction technology, while reducing construction costs and improving project reliability.
[0037] In this embodiment, the geomembrane layer 5 is a high-density polyethylene geomembrane with a thickness of ≥1.5mm. The joint between the geomembrane layer 5 and the composite drainage net layer 4 is connected by a double-track hot-melt welding method to ensure the effectiveness of the geomembrane layer 5 laying and to ensure waterproofing and seepage prevention.
[0038] In this embodiment, fine sand is replaced by a combination of transition layer 1, subbase layer 2, filter layer 3, and composite drainage net layer 4, and construction is carried out using a road paver to ensure that the flatness of the support layer is ≤ This optimizes project investment while effectively avoiding the risks of rupture and tearing caused by uneven stress on the geomembrane.
[0039] Example 2
[0040] Specifically, the transition layer 1 uses weakly weathered, fresh stone, the thickness of the transition layer 1 is 160cm, the maximum particle size of the stone in the transition layer 1 is 300mm, the content of particles smaller than 5mm is controlled in the range of 5%-20%, the porosity is ≤18%, and it allows for free drainage.
[0041] Specifically, the raw materials of the transition layer 1 are obtained in a graded continuous manner. During the filling construction, particle separation should be avoided during unloading and spreading. After appropriate watering, a 26t vibratory roller is used for compaction, and the number of compaction times is 8. After compaction, its deformation modulus is not less than 40 MPa.
[0042] In this embodiment, specific provisions are made regarding the material acquisition method, material requirements, and laying requirements of the transition layer 1 to ensure the function of the transition layer 1.
[0043] Example 3
[0044] Specifically, the cushion layer 2 is a freshly rolled product, with a thickness of 48-52 cm, a maximum particle size of 20 mm, and the content of particles smaller than 5 mm controlled within the range of 28%-40%. The porosity is ≤17%, and the permeability coefficient is [missing information]. .
[0045] Specifically, the raw material of the cushion layer 2 is obtained by aggregate gradation. During the filling construction, particle separation should be avoided during unloading and spreading. After appropriate watering, it is compacted by a 26t vibratory roller for 8 times. After compaction, its deformation modulus is not less than 40MPa.
[0046] In this embodiment, specific provisions are made regarding the material acquisition method, material requirements, and laying requirements of the subbase 2 to ensure the function of the subbase 2.
[0047] Example 4
[0048] Specifically, the filter media layer 3 is made from freshly rolled material by hand. The thickness of the filter media layer 3 is 12-16cm. The raw material of the filter media layer 3 is obtained by aggregate gradation. The particle size of the filter media layer 3 is ≤2cm, the non-uniformity coefficient Cu is 5-8, the curvature coefficient Cc is 1-3, and the permeability coefficient is ≥1×10⁻³cm / s.
[0049] Specifically, the filter material layer 3 is laid and compacted using a road paver. Before compaction, other materials are removed to keep the filter material layer moist. A 20t vibratory roller is used for compaction, with six compaction passes. After compaction, the smoothness is ensured to be ≤ The compaction degree is ≥95%.
[0050] In this embodiment, specific provisions are made regarding the material acquisition method, material requirements, and laying requirements of the reverse filter layer 3 to ensure the function of the reverse filter layer 3.
[0051] In Examples 3 and 4, the pad layer 2 and the filter layer 3 are made from fresh finished products obtained by manual rolling. By using local materials, material costs are saved, construction efficiency is increased by 466%, the construction period is significantly shortened, construction efficiency is greatly improved, and the overall project investment is reduced, resulting in significant economic benefits.
[0052] Example 5
[0053] Specifically, the composite drainage net layer 4 consists of two layers of non-woven geotextile and one layer of three-dimensional mesh core material. The core opening rate is ≥80%, the compressive strength is ≥50kN / m², the unit area mass of the non-woven geotextile is ≥200g / m², the puncture strength is ≥3.5kN, and the planar water conductivity is ≥0.003m² / s.
[0054] Specifically, the three-dimensional mesh core material is made of polypropylene and is suitable for environments with a pH of 2-13.
[0055] In this embodiment, specific provisions are made regarding the material acquisition method, material requirements, and laying requirements of the composite drainage net layer 4 to ensure the function of the composite drainage net layer 4.
[0056] In this embodiment, the planar water conductivity of the composite drainage net layer 4 is increased by 650% compared with that of traditional geomat. Combined with the overall layered drainage function of the lower support layer, the drainage capacity is significantly improved, the drainage performance is enhanced, and it is suitable for high water head conditions.
[0057] In this embodiment, the three-dimensional mesh core material is made of polypropylene, which has chemical corrosion resistance, is suitable for environments with pH 2-13, and extends the system service life to the design standard of 50 years.
[0058] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.
[0059] Many other changes and modifications can be made without departing from the concept and scope of this utility model. It should be understood that this utility model is not limited to the specific embodiments, and the scope of this utility model is defined by the appended claims.
Claims
1. A composite structure for a geomembrane support layer, characterized by, The combined structure comprises a transition layer (1), a cushion layer (2), a filter material layer (3), and a composite drainage net layer (4), wherein the transition layer (1) is located at the bottom of the combined structure, the cushion layer (2) is located above the transition layer (1), the filter material layer (3) is located above the cushion layer (2), the composite drainage net layer (4) is located above the filter material layer (3), and a geomembrane layer (5) is laid above the composite drainage net layer (4), wherein the geomembrane layer (5) is made of high-density polyethylene geomembrane with a thickness of ≥1.5 mm.
2. A composite structure for a geomembrane support layer according to claim 1, characterized in that The transition layer (1) is made of weak, slightly weathered, and fresh stone, the thickness of the transition layer (1) is 160 cm, the maximum particle size of the stone in the transition layer (1) is 300 mm, the content of particles with a size of less than 5 mm is controlled in the range of 5%-20%, the porosity is ≤18%, and the permeation free drainage is achieved.
3. A composite structure for a geomembrane support layer according to claim 2, wherein The raw materials of the transition layer (1) are obtained in a continuously graded manner.
4. The composite structure for a geomembrane support layer according to claim 1, wherein The cushion layer (2) is made of artificial rolling fresh product, the thickness of the cushion layer (2) is 48-52 cm, the porosity is ≤17%, and the permeability coefficient is .
5. A composite structure for a geomembrane support layer according to claim 4, wherein The raw materials of the cushion layer (2) are obtained in an aggregate grading manner.
6. The composite structure for a geomembrane support layer according to claim 1, wherein The filter material layer (3) is made of artificial rolled fresh products, the thickness of the filter material layer (3) is 12-16 cm, the raw materials of the filter material layer (3) are obtained in an aggregate grading manner, the particle size of the filter material layer (3) is ≤2 cm, the coefficient of non-uniformity Cu is 5-8, the curvature coefficient Cc is 1-3, and the permeability coefficient is ≥1×10⁻³ cm / s.
7. A composite structure for a geomembrane support layer according to claim 6, wherein The inverse filter material layer (3) is paved and rolled by a highway paver, and after rolling, the flatness is ensured to be ≤ , and the compaction degree is ≥ 95%.
8. The composite structure for a geomembrane support layer according to claim 1, wherein The composite drainage net layer (4) is composed of two layers of non-woven geotextile and one layer of three-dimensional net core material, the opening rate of the net core is ≥80%, the compressive strength is ≥50 kN / m², the mass per unit area of the non-woven geotextile is ≥200 g / m², the bursting strength is ≥3.5 kN, and the plane water conductivity is ≥0.003 m² / s.
9. A composite structure for a geomembrane support layer according to claim 8, wherein The three-dimensional net core material is made of polypropylene and is suitable for environments with a pH of 2-13.