CN217630133U

CN217630133U - Landfill slope seepage prevention system

Info

Publication number: CN217630133U
Application number: CN202221530555.3U
Authority: CN
Inventors: 王玉琦; 王智; 银剑; 曹魏; 彭雨生; 郭俊; 顾守瑜; 肖朝政
Original assignee: Southwest Municipal Engineering Design and Research Institute of China
Current assignee: Southwest Municipal Engineering Design and Research Institute of China
Priority date: 2022-06-17
Filing date: 2022-06-17
Publication date: 2022-10-21
Anticipated expiration: 2032-06-17

Abstract

The utility model discloses a landfill slope seepage prevention system belongs to the technical field of domestic waste handles the prevention of seepage. It has set gradually groundwater water conservancy diversion layer, barrier layer, protection water conservancy diversion layer from bottom to top, protection water conservancy diversion layer includes first protective layer, filtration liquid water conservancy diversion layer and geotechnological check room layer, filtration liquid water conservancy diversion layer is located between first protective layer and the geotechnological check room layer, first protective layer is located between barrier layer and the filtration liquid water conservancy diversion layer. The utility model has the advantages of with low costs, the construction is simple and convenient, the reliability is high, can once only accomplish the construction.

Description

Landfill slope seepage prevention system

Technical Field

The utility model relates to a landfill slope seepage prevention system belongs to the technical field of domestic waste handles the prevention of seepage.

Background

With the development of social economy, the yield of the household garbage increases year by year, and the incineration disposal amount of the household garbage in 2019 in China exceeds the landfill disposal amount for the first time, but the landfill disposal amount is still about 2 hundred million tons per year. Landfill remains the primary mode of disposal of domestic waste in western cities and county-level administrative districts, and landfill, as the final disposal of solid waste, necessarily entails that landfill construction will persist for a long time. According to relevant standards and standard requirements of pollution control standards of domestic waste landfill sites (GB 16889-2008) and sanitary landfill treatment technical specifications of domestic waste (GB 50869-2013), a defense system must be built in the landfill sites to prevent the landfill leachate from polluting underground water and surface water. At present, the problem of serious damage of the impermeable layer of the domestic constructed refuse landfill is serious, and the leak is detected to be about 17 per ten thousand meters according to the integrity detection of the impermeable films of 79 newly-built landfill sites in twelve provinces and 20 surplus landfill sites in operation in China ² The number of leaks produced by the excellent landfill barrier construction well beyond the U.S. EPA regulations does not exceed 3 per hectare. The main reason for the above mentioned barrier layer breakage is that the HDPE film is pierced from above or below by sharp objects such as crushed stones, twigs, etc. which may come from the ground base layer or clay layer under the HDPE film during construction and from the landfill waste, after being crushed by the transport vehicle.

In order to solve the problem of damage of an impermeable layer, most of landfill slope impermeable structure layers are protected by geotextile bags at present, but on one hand, construction in the mode needs a manual stacking mode, and construction cost is high; on the other hand, the geotextile bags cannot be fully paved at one time, only the mode of garbage landfill and paving can be adopted, and the geotechnical protection materials on the films at the positions where the side slopes are not paved are easily blown and torn by wind. In addition, the oxidation resistance time of the geotextile bag is generally not more than 2 years, and the impermeable structural layer cannot be effectively protected for a long time. Therefore, it is necessary to develop an anti-seepage system which has low cost and easy construction and can effectively protect the side slope of the refuse landfill for a long time.

Disclosure of Invention

The utility model aims to overcome among the prior art refuse landfill slope seepage prevention system construction inconvenient, difficult maintenance, filtration liquid drainage guide are not smooth, can not effectively protect shortcoming such as barrier material for a long time, provide a cost lower, the construction is simple and convenient, easy to maintain and filtration liquid water conservancy diversion and the excellent refuse landfill slope seepage prevention system of prevention of seepage effect.

The purpose of the utility model is realized through the following technical scheme: the utility model provides a landfill side slope seepage prevention system, has set gradually groundwater water conservancy diversion layer, barrier layer, protection water conservancy diversion layer from bottom to top, protection water conservancy diversion layer includes first protective layer, filtration liquid water conservancy diversion layer and geotechnological check room layer, filtration liquid water conservancy diversion layer is located between first protective layer and the geotechnological check room layer, first protective layer is located between barrier layer and the filtration liquid water conservancy diversion layer.

Furthermore, the underground water diversion layer and the percolate diversion layer are both geotechnical composite drainage nets.

Further, the thickness of the geotechnical composite drainage net is not less than 6cm.

Furthermore, the barrier layer comprises a first barrier layer and a second barrier layer, the first barrier layer is a nano bentonite waterproof blanket, the second barrier layer is a high density polyethylene geomembrane, and the first barrier layer is positioned between the underground water diversion layer and the second barrier layer.

Further, the permeability coefficient of the first impermeable layer is not more than 5.0 x 10 ^-9 cm/s, the first barrier layer has a specific gravity of not less than 4800g/m ² (ii) a Thickness of the second barrier layerThe degree is not less than 2mm.

Further, the first protective layer is non-woven geotextile, and the weight of the first protective layer is not less than 600g/m ² 。

Furthermore, the geocell layer comprises geocells and fillers filled in the geocells, and the fillers are fine aggregates.

Further, the height of the geocell is not less than 10cm, and the permeability coefficient of the geocell layer is not less than 10 ^-3 cm/s。

Further, the geocell layer also comprises a connecting part, and the connecting part is connected between adjacent geocells; the connecting part comprises a connecting belt and a plurality of connecting pieces, and the connecting pieces are evenly distributed on the connecting belt along the length direction of the connecting belt.

Furthermore, the connecting piece is the shape of falling U, the inboard of connecting piece is provided with the direction arch that is used for the fixed geotechnological check layer of direction.

The utility model has the advantages that:

1) Through setting up the protection water conservancy diversion layer to by first protective layer, the multilayer structure that filtration liquid water conservancy diversion layer and geotechnological check room layer are constituteed, form the epimembranal protective layer of barrier layer by first protective layer, carry out the water conservancy diversion to filtration liquid by filtration liquid water conservancy diversion layer, geotechnological check room layer then has the function of protection and water conservancy diversion concurrently, when guaranteeing the quick seepage flow of filtration liquid, provide the protection to whole anti-seepage system, avoid sharp thing in the rubbish to puncture the barrier layer, also isolated ultraviolet solarization, and then avoid the barrier layer damage and pollute groundwater. In use, the geocell layer can guide and discharge the side slope leachate to the bottom of the reservoir in time, and the stability of the landfill body is improved.

2) The geocell layer is used for replacing a traditional geocell structure, labor cost for filling and laying the geocell is saved, the geocell layer (10 cm) is thinner than the geocell layer (20-30 cm), filling amount of the geocell layer is reduced, storage capacity occupied by an anti-seepage system is saved, maintenance cost is reduced, and the geocell layer has higher economy. And simultaneously, the utility model provides an original geotechnique's bag can't once only with the whole problem of paving in side slope, avoided it can only along with the heap height of landfill and lay the condition that leads to unable protection not to lay the side slope of geotechnological bag and appear, geotechnological check room layer can once only be accomplished at the construction phase is whole, plays long-term guard action to whole side slope seepage prevention system.

3) Compared with the technology of laying the traditional geotextile bags as the anti-seepage protective layer, the single group area of the geocell is not less than 20m ² The utility model discloses a rubbish landfill bag, including geotechnique bag, adjacent intergroup accessible welding or connecting portion realize connecting to form a whole, have higher stability and reliability, improved geotechnological bag mutual independence, not have the current situation of wholeness, also be favorable to avoiding the rubbish landfill in-process to take place the condition appearance that local slip collapsed even.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a top view of the geocell layer of the present invention.

Fig. 3 is a front view of the geocell layer connection portion of the present invention in a state of not being connected to a geocell.

Fig. 4 is a side view of the connecting portion.

In the figure, 1, an underground water diversion layer; 2. an impermeable layer; 21. a first barrier layer; 22. a second barrier layer; 3. protecting the flow guide layer; 31. a first protective layer; 32. a percolate flow guiding layer; 33. a geocell layer; 331. earthwork standard room; 332. a filler; 333. a connecting portion; 3331. a connecting belt; 3332. a connecting member.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present invention.

As shown in fig. 1, the utility model provides a technical solution: landfill slope seepage prevention system is from bottom to top in proper orderThe underground water diversion layer 1 is provided with an underground water diversion layer 1, an impermeable layer 2 and a protection diversion layer 3, wherein the underground water diversion layer 1 adopts a geotechnical composite drainage net, has the thickness of not less than 6cm and is used for diversion of underground water. The impermeable layer 2 of the embodiment comprises a first impermeable layer 21 and a second impermeable layer 22, the first impermeable layer 21 is a nano bentonite waterproof blanket with a permeability coefficient not greater than 5.0 x 10 ^-9 cm/s, gravity of not less than 4800g/m ² . The second impermeable layer 22 is a high-density polyethylene geomembrane, the thickness of the second impermeable layer is not less than 2mm, and the first impermeable layer 21 is positioned between the underground water diversion layer 1 and the second impermeable layer 22, namely, the geotechnical composite drainage net, the nano bentonite waterproof blanket and the high-density polyethylene geomembrane are sequentially arranged from bottom to top.

As shown in fig. 1, the protective diversion layer 3 of the present embodiment includes a first protective layer 31, a percolate diversion layer 32 and a geocell layer 33, wherein the first protective layer 31 is a non-woven geotextile with a weight of not less than 600g/m ² . The percolate flow guiding layer 32 is a geotechnical composite drainage net and is used for guiding percolate, and the thickness of the percolate flow guiding layer is not less than 6cm. The geocell layer 33 comprises geocells 331 and fillers 332 filled in the geocells 331, the geocell 331 adopted in the embodiment is not less than 10cm in height, the fillers 332 are fine aggregates, the fine aggregates can be sand or other fine aggregates with good permeation effect, and the permeation coefficient of the filled geocell layer 33 is not less than 10 ^-3 cm/s. The first protective layer 31 is located between the impermeable layer 2 and the percolate flow guiding layer 32, the percolate flow guiding layer 32 is located between the first protective layer 31 and the geocell layer 33, and the geocell layer 33 is located above the percolate flow guiding layer 32.

As shown in fig. 2 and 3, in order to improve the overall stability of the geocell layer 33, the geocell layer 33 of this embodiment further includes a connecting portion 333, where the connecting portion 333 is connected between adjacent geocells 331, so that a plurality of groups of geocells 331 are connected to form a whole. The connecting part 333 of this embodiment includes a connecting strip 3331 and a plurality of connecting members 3332, where the connecting strip 3331 may be a nylon strip or other rope with strong flexibility, and the plurality of connecting members 3332 are uniformly distributed on the connecting strip 3331 along the length direction of the connecting strip 3331, and the distance between adjacent connecting members 3332 is close to the distance between adjacent connecting points of the geocell 331. For the convenience of connection and fixation, the connecting member 3332 of this embodiment has an inverted U shape, the outer side of the U-shaped bottom end of the connecting member 3332 is connected to the connecting strip 3331 so that the U-shaped opening of the connecting member 3332 faces downward, and a guide protrusion (see fig. 4) for guiding and fixing the geocell layer 33 is provided on the inner side of the connecting member 3332, that is, the guide protrusion is inclined toward the inner side of the connecting member 3332, so that it is convenient to clamp and fix the geocell 331 guided into the inner side of the connecting member 3332 when it is fixed.

The foregoing is illustrative of the preferred embodiments of the present invention, and it is to be understood that the invention is not limited to the precise forms disclosed herein, and that various other combinations, modifications, and environments may be resorted to, falling within the scope of the invention as defined by the appended claims. But that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention, which is to be limited only by the claims appended hereto.

Claims

1. The utility model provides a landfill side slope seepage prevention system has set gradually groundwater guiding layer (1), barrier layer (2), protection guiding layer (3) from bottom to top, its characterized in that: the protective flow guide layer (3) comprises a first protective layer (31), a percolate flow guide layer (32) and a geocell layer (33), the percolate flow guide layer (32) is located between the first protective layer (31) and the geocell layer (33), and the first protective layer (31) is located between the impermeable layer (2) and the percolate flow guide layer (32).

2. The landfill slope seepage prevention system according to claim 1, characterized in that: the underground water diversion layer (1) and the percolate diversion layer (32) are both geotechnical composite drainage nets.

3. The landfill slope seepage prevention system of claim 2, wherein: the thickness of the geotechnical composite drainage network is not less than 6cm.

4. The landfill slope seepage prevention system of claim 1, wherein: the impermeable layer (2) comprises a first impermeable layer (21) and a second impermeable layer (22), the first impermeable layer (21) is a nano bentonite waterproof blanket, the second impermeable layer (22) is a high-density polyethylene geomembrane, and the first impermeable layer (21) is positioned between the underground water diversion layer (1) and the second impermeable layer (22).

5. The landfill slope seepage prevention system of claim 4, wherein: the permeability coefficient of the first impermeable layer (21) is not more than 5.0 x 10 ^-9 cm/s, the first barrier layer (21) having a specific gravity of not less than 4800g/m ² (ii) a The thickness of the second impermeable layer (22) is not less than 2mm.

6. The landfill slope seepage prevention system of claim 1, wherein: the first protective layer (31) is non-woven geotextile, and the weight of the first protective layer (31) is not less than 600g/m ² 。

7. The landfill slope seepage prevention system of claim 1, wherein: the geocell layer (33) comprises geocells (331) and fillers (332) filled in the geocells (331), and the fillers (332) are fine aggregates.

8. The landfill slope seepage prevention system of claim 7, wherein: the height of the geocell (331) is not less than 10cm, and the permeability coefficient of the geocell layer (33) is not less than 10 ^-3 cm/s。

9. The landfill slope seepage control system of claim 7, characterized in that: the geocell layer (33) further comprises connecting parts (333), and the connecting parts (333) are connected between adjacent geocells (331); connecting portion (333) include connecting band (3331) and a plurality of connecting piece (3332), and is a plurality of connecting piece (3332) are along the length direction evenly distributed of connecting band (3331) on connecting band (3331).

10. The landfill slope seepage prevention system of claim 9, wherein: the connecting piece (3332) is in an inverted U shape, and the inner side of the connecting piece (3332) is provided with a guide bulge for guiding and fixing the geocell layer (33).