Impermeable structure of refuse landfill
By adopting a multi-layer anti-seepage structure in the landfill, including a reinforced layer, a gravel cushion layer, a bentonite cushion and a geofilter, the problem of easy damage of the HDPE anti-seepage membrane is solved, effective leachate protection is achieved, and groundwater and soil are protected.
Patent Information
- Application Number
- CN202422749258.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-12
- Publication Date
- 2025-09-12
- Estimated Expiration
- 2034-11-12
AI Technical Summary
The HDPE anti-seepage membrane of the existing landfill is easily damaged, causing leachate to seep into the original foundation and pollute the soil and groundwater.
A multi-layer anti-seepage structure is adopted, including an upper anti-seepage layer, a lower anti-seepage layer and a bearing layer. By laying reinforcement layers on the upper and lower surfaces of the anti-seepage membrane, combining gravel cushion layers, bentonite cushion layers and clay anti-seepage layers, and using geotextile filters and reinforced grids, a comprehensive protection system is formed.
It enhances the tensile strength of the anti-seepage membrane, disperses the pressure and tension of the upper and lower bearing layers, prevents the anti-seepage layer from rupturing, effectively stops the infiltration of leachate, protects groundwater, and ensures that garbage leachate does not accumulate.
Smart Images
Figure CN223329898U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of landfill anti-seepage, in particular to a landfill anti-seepage structure. Background Art
[0002] Municipal landfills are the primary method for disposing of domestic waste in most Chinese cities. After being solidified and extruded, municipal waste is buried in potholes to prevent direct environmental pollution. This serves both as a waste disposal site and as a landfill. Currently, most landfills are located in the open air. Organic matter decomposed by microorganisms in the waste mixes with rainwater or surface water to form leachate. Landfills typically prevent leachate from seeping in by laying HDPE membranes on the slopes and bottoms. However, if the HDPE membranes are damaged, leachate can seep into the native foundation, contaminating the soil and groundwater. Utility Model Content
[0003] The utility model provides a landfill anti-seepage structure, which solves the problem that the HDPE anti-seepage membrane in the landfill anti-seepage structure is damaged, causing leachate to seep into the original foundation and pollute the soil and groundwater.
[0004] To achieve the above-mentioned purpose, the utility model proposes a landfill anti-seepage structure, comprising an upper bearing layer, an upper anti-seepage layer, a lower anti-seepage layer and a lower bearing layer;
[0005] The upper anti-seepage layer includes an anti-seepage membrane and a reinforcement layer 1, wherein the reinforcement layer 1 has two layers and is laid on the upper surface and the lower surface of the anti-seepage membrane respectively;
[0006] The lower anti-seepage layer includes a clay anti-seepage layer and a bentonite pad, and the bentonite pad is laid on the upper surface of the clay anti-seepage layer;
[0007] The lower anti-seepage layer is laid on the lower bearing layer, the upper anti-seepage layer is laid on the lower anti-seepage layer, and the upper bearing layer is laid on the upper anti-seepage layer.
[0008] Preferably, the upper surface of the upper reinforcement layer 1 and the lower surface of the lower reinforcement layer 1 are respectively paved with gravel cushion layers.
[0009] Preferably, the thickness of the gravel cushion layer is 150 mm.
[0010] Preferably, the upper bearing layer includes a coarse aggregate layer 1 and a covering layer, and the covering layer is laid on the coarse aggregate layer 1.
[0011] Preferably, a geofilter is provided between the cover layer and the coarse aggregate layer.
[0012] Preferably, the upper bearing layer further includes a reinforcing grid 1, and the coarse aggregate layer 1 is filled in the reinforcing grid 1.
[0013] Preferably, the lower bearing layer includes a second coarse aggregate layer and an original foundation, and the second coarse aggregate layer is laid on the original foundation.
[0014] Preferably, the lower bearing layer further includes a second reinforcing grid, and the second coarse aggregate layer is filled in the second reinforcing grid.
[0015] Preferably, a second reinforcement layer is laid on the second coarse aggregate layer.
[0016] Preferably, the thickness of the coarse aggregate layer 1 and the coarse aggregate layer 2 are both 300 mm.
[0017] The utility model has the following beneficial effects:
[0018] 1. Lay a reinforcement layer on the upper and lower surfaces of the anti-seepage membrane respectively. This can increase the tensile strength of the anti-seepage membrane and prevent the tensile force on the upper bearing layer and the lower anti-seepage layer from being directly transferred to the anti-seepage layer and tearing the anti-seepage layer;
[0019] 2. The gravel cushion layer can disperse the pressure and tension transmitted to the anti-seepage layer by the upper and lower bearing layers, further protecting the anti-seepage layer and preventing it from rupturing;
[0020] 3. The combination of bentonite pad and clay anti-seepage layer can prevent leachate from seeping into groundwater and polluting groundwater;
[0021] 4. Geotextile filters can effectively filter landfill leachate, preventing it from leaking into groundwater, thereby protecting groundwater from pollution. At the same time, the filter can also collect and drain landfill leachate to ensure that it does not accumulate in the landfill;
[0022] 5. Strengthening the second grid can increase the integrity of the second coarse aggregate layer, prevent the second coarse aggregate layer from cracking, and transfer the tensile stress to the original foundation, causing the original foundation to crack;
[0023] 6. The reinforcement layer 2 can further increase the integrity of the coarse aggregate layer 2. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] Figure 1 This is an exploded schematic diagram of the landfill anti-seepage structure of the utility model;
[0025] Figure 2 This is a schematic structural diagram of the upper bearing layer in the landfill anti-seepage structure of the utility model;
[0026] Figure 3 This is a schematic structural diagram of the upper and lower anti-seepage layers in the landfill anti-seepage structure of the present invention;
[0027] Figure 4 This is a schematic structural diagram of the lower bearing layer of the landfill anti-seepage structure described in the present invention.
[0028] In the figure, 1 is the upper bearing layer; 11 is the first coarse aggregate layer; 12 is the geofilter; 13 is the first reinforced grid; 2 is the upper anti-seepage layer; 14 is the covering layer; 21 is the gravel cushion layer; 22 is the first reinforced layer; 23 is the anti-seepage membrane; 3 is the lower anti-seepage layer; 31 is the clay anti-seepage layer; 32 is the bentonite cushion; 4 is the lower bearing layer; 41 is the original foundation; 42 is the second coarse aggregate layer; 43 is the second reinforced grid; 44 is the second reinforced layer. DETAILED DESCRIPTION
[0029] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments so that those skilled in the art can implement the invention with reference to the description.
[0030] The utility model proposes a landfill anti-seepage structure, such as Figure 1 and Figure 3 As shown, it includes an upper bearing layer 1, an upper anti-seepage layer 2, a lower anti-seepage layer 3 and a lower bearing layer 4. The upper anti-seepage layer 2 includes an anti-seepage membrane 23 and a reinforcement layer 22. The reinforcement layer 22 has two layers and is respectively laid on the upper surface and lower surface of the anti-seepage membrane 23. The lower anti-seepage layer 3 includes a clay anti-seepage layer 31 and a bentonite pad 32. The bentonite pad 32 is laid on the upper surface of the clay anti-seepage layer 31. The lower anti-seepage layer 3 is laid on the lower bearing layer 4. The upper anti-seepage layer 2 is laid on the lower anti-seepage layer 3. The upper bearing layer 1 is laid on the upper anti-seepage layer 2.
[0031] like Figure 3 As shown, the upper surface of the upper reinforcement layer 22 and the lower surface of the lower reinforcement layer 22 are respectively paved with gravel cushion layers 21.
[0032] The anti-seepage membrane 23 is a 1.5 mm thick double-sided rough HDPE film.
[0033] The thickness of the gravel cushion layer 21 is 150 mm.
[0034] The reinforcement layer 22 is made of non-woven geotextile.
[0035] The thickness of the clay anti-seepage layer 31 is 300 mm.
[0036] Reinforcement layers 22 are laid on the upper and lower surfaces of the anti-seepage membrane 23 respectively, which can increase the tensile strength of the anti-seepage membrane 23 and prevent the tensile force exerted on the upper bearing layer 1 and the lower anti-seepage layer 3 from being directly transmitted to the anti-seepage layer and tearing the anti-seepage layer.
[0037] The gravel cushion layer 21 can disperse the pressure and tension transferred from the upper bearing layer 1 and the lower bearing layer 4 to the anti-seepage layer, thereby further protecting the anti-seepage layer and preventing the anti-seepage layer from rupture.
[0038] The bentonite pad 32 and the clay anti-seepage layer 31 can cooperate to prevent leachate from seeping into the groundwater and polluting the groundwater.
[0039] like Figure 2 As shown, the upper bearing layer 1 includes a coarse aggregate layer 11 and a covering layer 14 , and the covering layer 14 is laid on the coarse aggregate layer 11 .
[0040] The coarse aggregate layer 11 is made of crushed stone, with a layer thickness of 300 mm and a coarse aggregate particle size of 40-60 mm.
[0041] The layer thickness of the cover layer 14 is 300 mm.
[0042] like Figure 2 As shown, a geofilter 12 is provided between the cover layer 14 and the coarse aggregate layer 11 .
[0043] The geotextile filter 12 can effectively filter the landfill leachate, preventing it from leaking into the groundwater, thereby protecting the groundwater from pollution. At the same time, the filter can also collect and drain the landfill leachate, ensuring that it does not accumulate in the landfill.
[0044] like Figure 2 As shown, the upper bearing layer 1 further includes a reinforcing grid 13 , and the coarse aggregate layer 11 is filled in the reinforcing grid 13 .
[0045] The reinforcement grid 13 adopts geogrid.
[0046] The reinforced grid 13 can increase the integrity of the coarse aggregate layer 11, prevent cracks in the coarse aggregate layer 11, and transfer the tensile stress to the upper anti-seepage layer 2, tearing the anti-seepage membrane 23, causing leachate to seep down and pollute groundwater.
[0047] like Figure 4 As shown, the lower bearing layer 4 includes a second coarse aggregate layer 42 and an original foundation 41 , and the second coarse aggregate layer 42 is laid on the original foundation 41 .
[0048] The second coarse aggregate layer 42 is made of crushed stone, with a layer thickness of 300 mm and a coarse aggregate particle size of 40-60 mm.
[0049] The compaction degree of the original foundation 41 is greater than or equal to 94%.
[0050] like Figure 4 As shown, the lower bearing layer 4 further includes a second reinforcing grid 43 , and the second coarse aggregate layer 42 is filled in the second reinforcing grid 43 .
[0051] The reinforced grid 243 adopts geogrid.
[0052] The reinforced grid 43 can increase the integrity of the coarse aggregate layer 42 , prevent the coarse aggregate layer 42 from cracking, and transfer the tensile stress to the original foundation 41 , causing the original foundation 41 to crack.
[0053] like Figure 4 As shown, a second reinforcement layer 44 is laid on the second coarse aggregate layer 42 .
[0054] The second reinforcement layer 44 is made of non-woven geotextile.
[0055] The second reinforcement layer 44 can further enhance the integrity of the second coarse aggregate layer 42 .
[0056] According to the present invention, the original foundation 41 is first rolled to reach the specified compaction degree, and then a reinforced grid 13 is laid on the original foundation 41, and a coarse aggregate layer 11 is filled in the reinforced grid 13, and then a reinforced layer 2 44 is laid on the coarse aggregate layer 11, and then a clay anti-seepage layer 31 and a bentonite pad 32 are laid from bottom to top. After the lower anti-seepage layer 3 is laid, the upper anti-seepage layer 2 is laid, and from bottom to top, the lower gravel pad 21, the lower reinforced layer 22, the anti-seepage membrane 23, the upper reinforced layer 22, and the upper gravel pad 21 are laid, and finally the upper bearing layer 1 is laid, and a reinforced grid 13 is first laid on the upper surface of the upper gravel pad 21, and then the coarse aggregate layer 11 is filled in the reinforced grid 13, and then a geofilter 12 is laid on the coarse aggregate layer 11, and finally a covering layer 14 is laid on the geofilter 12.
[0057] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the description and implementation methods. They can be fully applied to various fields suitable for the present invention. For those familiar with this field, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.
Claims
1. A landfill anti-seepage structure, characterized in that: The invention comprises an upper bearing layer (1), an upper anti-seepage layer (2), a lower anti-seepage layer (3) and a lower bearing layer (4); the upper anti-seepage layer (2) comprises an anti-seepage membrane (23) and a reinforcement layer (22); the reinforcement layer (22) is provided with two layers and is laid on the upper surface and the lower surface of the anti-seepage membrane (23) respectively; the lower anti-seepage layer (3) comprises a clay anti-seepage layer (31) and a bentonite pad (32); the bentonite pad (32) is laid on the upper surface of the clay anti-seepage layer (31); the lower anti-seepage layer (3) is laid on the lower bearing layer (4), the upper anti-seepage layer (2) is laid on the lower anti-seepage layer (3), and the upper bearing layer (1) is laid on the upper anti-seepage layer (2).
2. The landfill anti-seepage structure according to claim 1, characterized in that: The upper surface of the upper reinforcement layer 1 (22) and the lower surface of the lower reinforcement layer 1 (22) are respectively paved with gravel cushion layers (21).
3. The landfill anti-seepage structure according to claim 2, characterized in that: The thickness of the gravel cushion layer (21) is 150 mm.
4. The landfill anti-seepage structure according to claim 1, characterized in that: The upper bearing layer (1) comprises a coarse aggregate layer (11) and a covering layer (14), wherein the covering layer (14) is laid on the coarse aggregate layer (11).
5. The landfill anti-seepage structure according to claim 4, characterized in that: A geofilter (12) is provided between the covering layer (14) and the coarse aggregate layer (11).
6. The landfill anti-seepage structure according to claim 4, characterized in that: The upper bearing layer (1) further comprises a reinforcing grid (13), and the coarse aggregate layer (11) is filled in the reinforcing grid (13).
7. The landfill anti-seepage structure according to claim 4, characterized in that: The lower bearing layer (4) comprises a second coarse aggregate layer (42) and an original foundation (41), and the second coarse aggregate layer (42) is laid on the original foundation (41).
8. The landfill anti-seepage structure according to claim 7, characterized in that: The lower bearing layer (4) further comprises a second reinforcing grid (43), and the second coarse aggregate layer (42) is filled in the second reinforcing grid (43).
9. The landfill anti-seepage structure according to claim 7, characterized in that: A second reinforcement layer (44) is laid on the second coarse aggregate layer (42).
10. The landfill anti-seepage structure according to claim 8, characterized in that: The thickness of the coarse aggregate layer 1 (11) and the coarse aggregate layer 2 (42) are both 300 mm.