CN116078778A - Vertical partition structure of household garbage landfill site and construction method thereof - Google Patents
Vertical partition structure of household garbage landfill site and construction method thereof Download PDFInfo
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- CN116078778A CN116078778A CN202310218908.9A CN202310218908A CN116078778A CN 116078778 A CN116078778 A CN 116078778A CN 202310218908 A CN202310218908 A CN 202310218908A CN 116078778 A CN116078778 A CN 116078778A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B1/00—Dumping solid waste
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B1/00—Dumping solid waste
- B09B1/004—Covering of dumping sites
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B2101/00—Type of solid waste
- B09B2101/25—Non-industrial waste, e.g. household waste
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Abstract
The invention provides a vertical partition structure of a household garbage landfill site and a construction method thereof, wherein the vertical partition structure is arranged in the household garbage landfill site and comprises a fly ash landfill foundation and a fly ash landfill layer, the fly ash landfill foundation is provided with a fly ash landfill area, the fly ash landfill layer is arranged in the fly ash landfill area, the fly ash landfill area foundation comprises a household garbage pile body, a landfill gas guide and discharge reinforcement cushion layer, which are sequentially stacked from bottom to top, and the fly ash landfill layer comprises an impermeable structure layer, a shower solution guide and discharge layer and a fly ash solidified pile body, which are sequentially stacked from bottom to top. The invention has simple structure, fully utilizes the residual reservoir capacity of the domestic garbage landfill to fill the fly ash condensate, solves the problems of difficult site selection, long construction period and high engineering investment of the newly built fly ash landfill, solves the problems of the pulling crack of the landfill gas guide and discharge pipe and leakage of the seepage prevention film caused by the settlement of the domestic garbage stack body, and ensures the standard and safe landfill of the fly ash condensate in the domestic garbage landfill.
Description
Technical Field
The invention relates to the technical field of garbage disposal, in particular to a vertical partition structure of a household garbage landfill site and a construction method thereof.
Background
In recent years, urban household garbage incineration power generation gradually becomes a mainstream household garbage disposal mode, and fly ash generated in the incineration process can enter a household garbage landfill to be buried in a partition mode according to the pollution control standard of the household garbage landfill (GB 16889-2008) after being qualified in solidification treatment. At present, most of landfill sites for filling fly ash solidified materials are newly built fly ash landfill sites or landfill areas horizontally separated by partition dams when the landfill sites are designed. However, for the areas with limited newly built landfill sites, the existing residual storage capacity of the household garbage landfill sites is utilized for regional landfill, so that the method is a good way.
For landfill zoning, most of the existing designs are to build zoning dams (dykes) to divide the landfill into separate landfill areas, for example, a way disclosed in a stabilized fly ash landfill method (CN 109590305). There are also partition planning landfills to maximize the volume of a refuse receptacle, such as a method of using a landfill partition (CN 107597789) and a landfill process for a regular household refuse sanitary landfill (CN 110000182). The scheme is suitable for new landfill sites. For a household garbage landfill site with a large amount of household garbage buried therein, the household garbage is dug out and burned, so that the environment pollution is brought, and the household garbage landfill site is limited by the receiving capacity of a household garbage incineration plant, so that the conventional household garbage stack body is used as a bottom of a warehouse for vertical partition utilization, and the household garbage landfill site is a better scheme. At present, the scheme of capacity expansion is carried out on the shaped pile body, on one hand, only an impermeable layer is described, such as an impermeable structure (CN 205421353U) for capacity expansion after sealing of a sanitary landfill of household garbage; on the other hand, capacity expansion schemes are proposed for domestic refuse landfills which have reached or exceeded the designed storage capacity, such as a transverse capacity expansion structure (CN 206189473U) for refuse landfills, which achieves transverse capacity expansion by newly building a refuse dam, newly building a bottom and newly building a bottom impermeable system outside the existing refuse dam; in addition, there are also schemes for directly piling new garbage on an existing garbage pile body by heightening a garbage dam (yard dam), such as a capacity expansion structure (CN 201762713U) for a solid garbage yard.
The above technology has the following disadvantages: 1. the method is suitable for newly-built landfill sites; 2. the method is suitable for continuously piling up solid wastes with the same property after the expansion, and is not suitable for the use condition of establishing an independent landfill warehouse area for the solidified fly ash landfill on the household garbage stack body. The method is characterized in that the fly ash condensate is piled on the household garbage pile body, the property of the fly ash condensate is completely different from that of the household garbage, the density of the fly ash condensate is larger than that of the household garbage, the fly ash condensate has potential risks of exudation of harmful substances when soaked in acid percolate generated by the household garbage for a long time, meanwhile, leaching liquid generated by fly ash landfill is possibly caused to destabilize and collapse of the existing household garbage landfill leachate treatment system if mixed with the percolate of the household garbage landfill site, so that the fly ash condensate and the household garbage are required to be separately landed, an independent landfill warehouse area effectively separated from a household garbage landfill warehouse area is required to be arranged, and a series of problems such as landfill gas guide and drainage pipe pulling crack, seepage prevention membrane damage of a seepage prevention system and the like are caused by the settlement of the household garbage pile body.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a vertical partition structure of a household garbage landfill and a construction method thereof.
According to the vertical partition structure of the household garbage landfill provided by the invention, the vertical partition structure is arranged in the household garbage landfill and comprises a fly ash landfill foundation and a fly ash landfill layer, wherein the fly ash landfill foundation is provided with a fly ash landfill area, the fly ash landfill layer is arranged in the fly ash landfill area, and the fly ash landfill foundation comprises a plurality of stacked layers sequentially from bottom to top:
the household garbage pile body is formed by shaping the existing household garbage according to the gradient requirement of the fly ash landfill area;
a landfill gas guide bar reinforced cushion layer;
the landfill gas guide bar reinforced cushion layer comprises:
the landfill gas guide and discharge layer is used for collecting and treating landfill gas generated by the household garbage stack body;
the reinforced cushion layer is used for preventing the leakage of the seepage-proof structure layer caused by uneven sedimentation of the household garbage pile body;
the fly ash landfill layer comprises the following components stacked in sequence from bottom to top:
the anti-seepage structure layer is provided with an anti-seepage film;
the leaching solution guide and discharge layer is used for collecting and treating the fly ash leaching solution generated by the fly ash solidified material pile;
and (3) stacking the fly ash solidified matters.
Preferably, the landfill gas guide and exhaust layer comprises a vertical landfill gas guide and exhaust system and a horizontal landfill gas guide and exhaust system, wherein the vertical landfill gas guide and exhaust system comprises a gas guide stone cage well and a vertical guide and exhaust pipe arranged in the gas guide stone cage well, and the horizontal landfill gas guide and exhaust system comprises a broken stone guide and exhaust blind ditch and a horizontal guide and exhaust pipe.
Preferably, the transverse guide and discharge pipe comprises a transverse branch pipe and a transverse main pipe which are communicated with each other;
the connection part of the vertical guide and discharge pipe and the connection part of the transverse branch pipe and the transverse main pipe are flexibly connected, and a settlement allowance is reserved.
Preferably, the reinforcement mat comprises a crushed stone reinforcement mat.
Preferably, the fly ash landfill area comprises a bottom and a side slope, and the impermeable structure layer comprises a bottom impermeable layer correspondingly arranged on the bottom and a side slope impermeable layer correspondingly arranged on the side slope;
a U-shaped sedimentation buffer zone is arranged at the joint of the reservoir bottom impermeable layer and the side slope impermeable layer;
the anti-seepage structure layer is reserved with a transverse sedimentation allowance, and the upper end of the side slope anti-seepage layer is temporarily anchored on a side slope.
Preferably, the anti-seepage structure layer comprises a film lower protective layer, a secondary anti-seepage layer, a seepage detection layer, a film lower protective layer, a main anti-seepage layer and a film upper protective layer which are sequentially arranged from bottom to top;
and the inner parts of the secondary impermeable layer and the main impermeable layer are respectively provided with an impermeable film.
Preferably, the leaching solution guide and discharge layer adopts a broken stone or pebble guide and discharge layer, a leaching solution guide and discharge pipe is buried in the guide and discharge layer, and a pumping and discharge inclined well is arranged at the tail end of the leaching solution guide and discharge pipe and used for pumping and discharging the leaching solution of the fly ash.
Preferably, the device also comprises a domestic garbage percolate pumping well which sequentially passes through the reinforced cushion layer, the seepage-proofing structure layer and the fly ash leaching solution guiding and discharging layer;
the under-film protective layer, the secondary protective layer, the under-film protective layer, the main protective layer and the over-film protective layer in the anti-seepage structure layer are fixed on the household garbage percolate pumping well and can be lifted along with the household garbage percolate pumping well.
According to the construction method of the vertical partition structure of the household garbage landfill, the vertical partition structure of the household garbage landfill is adopted, and the construction method comprises the following steps:
step 1: investigation and investigation of the household garbage landfill are carried out, and a basis is provided for the treatment of the existing household garbage landfill and the foundation treatment of the lower layer of the newly built fly ash landfill;
step 2: according to investigation and investigation conditions, treating the existing household garbage landfill;
step 3: shaping the existing household garbage according to the gradient requirement of the fly ash landfill area, and sequentially newly building a landfill gas guide and discharge layer and a reinforced cushion layer on the treated household garbage pile body to form a fly ash landfill area foundation;
step 4: a seepage-proofing structure layer is newly built in a fly ash landfill area on the foundation of the fly ash landfill area, and a settlement buffer area is newly built between the bottom seepage-proofing layer and the side slope seepage-proofing layer;
step 5: and newly creating a leaching solution guide and discharge layer on the seepage-proofing structure layer, arranging a pumping and discharge inclined shaft at the tail end of the fly ash leaching solution guide and discharge pipe, and pumping and discharging the fly ash leaching solution.
Preferably, in the step 4, a clay layer with the thickness of 300 mm-500 mm is arranged on the foundation of the fly ash landfill, and the seepage-proofing structure layer is arranged on the clay layer.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention has simple structure, fully utilizes the residual reservoir capacity of the domestic garbage landfill to fill the fly ash solidified matters, and solves the problems of difficult site selection, long construction period and high engineering investment of the newly built fly ash landfill.
2. The invention adopts the technical means of flexible connection of the broken stone reinforced cushion layer, the landfill gas guide and discharge pipe, the settlement buffer zone of the impermeable layer and reservation of the settlement allowance, solves the problem of leakage of the impermeable membrane caused by the pulling crack of the landfill gas guide and discharge pipe due to the settlement of the domestic garbage pile body, and ensures the standard and safe landfill of the fly ash solidified matters in the domestic garbage landfill site.
Drawings
Other features, objects and advantages of the present invention will become more apparent upon reading of the detailed description of non-limiting embodiments, given with reference to the accompanying drawings in which:
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic view showing the construction of a reservoir bottom barrier layer in example 1 of the present invention;
FIG. 3 is a schematic diagram of the structure of a side slope barrier layer according to embodiment 1 of the present invention;
FIG. 4 is a schematic diagram of a construction embodying a settlement buffer between a reservoir bottom barrier and a side slope barrier in the present invention.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the present invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications could be made by those skilled in the art without departing from the inventive concept. These are all within the scope of the present invention.
The invention discloses a vertical partition structure of a household garbage landfill site and a construction method thereof, wherein an existing household garbage landfill pile body is used as a bottom of a warehouse, the partition landfill of a fly ash solidified object on the household garbage pile body is realized through a vertical partition technology, and the influence of the settlement of the existing household garbage pile body on the landfill of the fly ash solidified object is prevented through the modes of reinforcing foundation treatment, optimizing landfill gas guide and discharge design, seepage prevention system design and the like, so that the standard and safe landfill of the fly ash solidified object in the household garbage landfill site is ensured.
According to the vertical partition structure of the household garbage landfill provided by the invention, the vertical partition structure is arranged in the household garbage landfill, as shown in fig. 1, and comprises a fly ash landfill foundation and a fly ash landfill layer, wherein the fly ash landfill foundation is provided with a fly ash landfill, the fly ash landfill layer is arranged in the fly ash landfill, and the fly ash landfill foundation comprises a plurality of layers stacked in sequence from bottom to top: the household garbage pile body and the landfill gas guide and discharge reinforced cushion layer are formed by shaping the existing household garbage according to the gradient requirement of the fly ash landfill area; the landfill gas guide bar reinforced cushion layer comprises: the landfill gas guide and discharge layer is used for collecting and treating landfill gas generated by the household garbage stack body; the reinforced cushion layer is used for preventing the leakage of the seepage-proof structure layer caused by uneven sedimentation of the household garbage pile body; the fly ash landfill layer comprises the following components stacked in sequence from bottom to top: the anti-seepage structure layer is provided with an anti-seepage film; the spray solution guide and discharge layer is used for pumping and discharging the fly ash spray solution generated by the fly ash solidified material pile; and (3) stacking the fly ash solidified matters.
The landfill gas guide and exhaust layer comprises a vertical landfill gas guide and exhaust system and a horizontal landfill gas guide and exhaust system, wherein the vertical landfill gas guide and exhaust system comprises a gas guide stone cage well and a vertical guide and exhaust pipe arranged in the gas guide stone cage well, and the horizontal landfill gas guide and exhaust system comprises a broken stone guide and exhaust blind ditch and a horizontal guide and exhaust pipe. The transverse guide and discharge pipe comprises a transverse branch pipe and a transverse main pipe which are communicated with each other; the connection part of the vertical guide and discharge pipe and the connection part of the transverse branch pipe and the transverse main pipe are flexibly connected, and a settlement allowance is reserved. The reinforced cushion layer comprises a broken stone reinforced cushion layer. The fly ash landfill area comprises a bottom and a side slope, and the impermeable structure layer comprises a bottom impermeable layer correspondingly arranged on the bottom and a side slope impermeable layer correspondingly arranged on the side slope; a U-shaped sedimentation buffer zone is arranged at the joint of the reservoir bottom impermeable layer and the side slope impermeable layer; the anti-seepage structure layer is reserved with a transverse sedimentation allowance, and the upper end of the side slope anti-seepage layer is temporarily anchored on a side slope. Preferably, the anti-seepage structure layer comprises a film lower protective layer, a secondary anti-seepage layer, a seepage detection layer, a film lower protective layer, a main anti-seepage layer and a film upper protective layer which are sequentially arranged from bottom to top; and the inner parts of the secondary impermeable layer and the main impermeable layer are respectively provided with an impermeable film. The leaching solution guide and discharge layer adopts a broken stone or pebble guide and discharge layer, a leaching solution guide and discharge pipe is buried in the guide and discharge layer, and a pumping and discharge inclined shaft is arranged at the tail end of the leaching solution guide and discharge pipe and used for pumping and discharging the leaching solution of fly ash. The device also comprises a household garbage percolate pumping well which sequentially passes through the reinforced cushion layer, the seepage-proofing structure layer and the fly ash leaching solution guide and discharge layer; the under-membrane protection layer, the secondary protection layer, the under-membrane protection layer, the main protection layer and the upper protection layer in the anti-seepage structure layer are fixed on a domestic garbage leachate pumping well, can be lifted along with the domestic garbage leachate pumping well, and remain a sedimentation allowance to prevent fly ash leaching solution from flowing into the domestic garbage pile body.
According to the construction method of the vertical partition structure of the household garbage landfill, provided by the invention, the vertical partition structure of the household garbage landfill is adopted, and the construction method comprises the following steps:
step 1: investigation and investigation of the household garbage landfill are carried out, and a basis is provided for the treatment of the existing household garbage landfill and the foundation treatment of the lower layer of the newly built fly ash landfill; the investigation and investigation comprise whether municipal sludge is filled, whether a percolate drainage system is blocked, whether a landfill gas drainage system is invalid, the percolate liquid level in a household garbage pile body, the bearing capacity of the household garbage pile body, rock-soil parameters and the like;
step 2: according to investigation and investigation conditions, treating the existing household garbage landfill sites, wherein the treatment comprises sludge pit treatment, newly built household garbage leachate pumping and discharging wells, newly built landfill gas guiding and discharging wells and the like, and the sludge pit treatment can be treated in the modes of sludge solidification, stone throwing, silt squeezing, stone block replacement, filling and the like;
step 3: shaping the existing household garbage according to the gradient requirement of the fly ash landfill area, and sequentially newly building a landfill gas guide and discharge layer and a reinforced cushion layer on the treated household garbage pile body to form a fly ash landfill area foundation;
specifically, the landfill gas generated by the existing household garbage is collected and treated by arranging a vertical landfill gas guide and discharge system and a horizontal landfill gas guide and discharge system; the household garbage pile body usually subsides along with the time and the weight loading of the fly ash landfill, so the key point of the foundation treatment scheme of the fly ash landfill is to prevent seepage of an impermeable membrane of the fly ash landfill caused by the subsidence of the household garbage pile body; in order to prevent the domestic garbage pile body from sedimentation, the landfill gas guide and discharge branch pipe and the main pipe are broken, flexible connection is adopted at the connection part of the vertical guide and discharge pipe and the transverse guide and discharge pipe and the connection part of the transverse branch pipe and the transverse main pipe, and sedimentation allowance is reserved.
Step 4: the novel anti-seepage structure is characterized in that an anti-seepage structure layer is newly built in a fly ash landfill area on a fly ash landfill area foundation, preferably, a double-layer anti-seepage structure is adopted, a clay layer with the thickness of 300-500 mmm is arranged on a reinforced bottom layer to prevent leakage of an anti-seepage film caused by uneven settlement of a household garbage heap, a U-shaped settlement buffer area is arranged at the joint of a bottom anti-seepage layer and a side slope anti-seepage layer to prevent the household garbage heap from causing the influence of pulling crack and the like, a transverse settlement allowance is reserved in the anti-seepage structure layer, the upper end of the side slope anti-seepage layer is temporarily anchored on a side slope, and specifically, as shown in fig. 4, the settlement allowance is a certain allowance is transversely arranged at the top of the side slope of the anti-seepage structure layer, when settlement occurs, the anti-seepage structure layer can be prevented from being broken through the settlement allowance, and the temporary anchoring is specifically realized by compacting a heavy object (such as a sand bag).
Step 5: and a leaching solution guide and discharge layer is newly built on the seepage-proofing structure layer, preferably, a broken stone/pebble guide layer is adopted, leaching solution guide and discharge pipes are buried in the broken stone/pebble guide layer to jointly form the leaching solution guide and discharge layer, and a pumping and discharge inclined shaft is arranged at the tail end of the leaching solution guide and discharge pipe to pump and discharge the generated fly ash leaching solution.
Example 1
In this embodiment, the vertical partition structure of the household garbage landfill is applied to a valley type household garbage landfill, the household garbage landfill is designed to have a storage capacity of about 244 thousands of cubic meters, the filled household garbage is about 130 tens of thousands of cubic meters, and the remaining storage capacity is about 110 tens of thousands of cubic meters.
By investigating and surveying the current situation of the landfill, the embodiment finds out the current situation of landfill pollution such as municipal sludge landfill amount and sludge distribution, the blockage situation of a percolate guide and discharge system, the situation of a landfill gas guide and discharge system, the percolate liquid level in a household garbage pile body, the bearing capacity of the household garbage pile body, rock-soil parameters, underground water monitoring well water quality and the like;
according to investigation and investigation conditions, the method adopts the modes of stone throwing, silt squeezing, stone block replacement, sludge solidification and the like to treat the sludge pit, realizes effective drainage of the domestic garbage leachate by creating a domestic garbage leachate drainage well, and realizes effective drainage of landfill gas by creating a landfill gas drainage well.
According to the present situation of the landfill site, the slope requirements of the newly-built fly ash landfill area are met, the existing household garbage pile body is shaped, and the surrounding is influenced by the odor easily generated by the household garbage excavation, so that the following scheme is adopted: .
According to the embodiment, the landfill height of the fly ash solidified matters is determined by performing software calculation and analysis on the settlement amount of the household garbage pile body under different landfill heights of the fly ash solidified matters, the stability of the garbage pile body is analyzed on the basis, the fly ash solidified matter pile body is ensured not to slip, and the foundation treatment scheme is determined according to the landfill height. In addition, the embodiment also carries out identification analysis on the current structural safety of the garbage dam and the structural safety of the solidified fly ash after landfill loading, thereby ensuring the safety of the garbage dam.
In order to prevent the problems of seepage prevention film leakage and the like in a fly ash landfill area caused by sedimentation of a household garbage pile body, the embodiment adopts a scheme of a reinforced cushion layer: the reinforced cushion layer comprises a layer of geogrid paved on a rolled and flattened household garbage pile body, and a graded broken stone layer with the total thickness of 50cm-100cm is paved, wherein each 20cm-40cm is layered, rolled and compacted, and the geogrid is paved to form a plurality of layers of geogrids; the use of the gravels is more beneficial to the drainage of landfill gas, but the investment is higher, so gravels and soil can be also used; the thickness of the broken stone/broken stone soil layer and the number of layers of the geogrid are checked and calculated and adjusted based on the investigation data.
In the embodiment, a vertical and a horizontal landfill gas guide and discharge layers are formed by newly building a gas guide and cage well, a gravel guide and discharge blind ditch or a gravel guide and discharge layer, a landfill gas guide and discharge pipe, a horizontal guide and discharge pipe and a vertical guide and discharge pipe, and landfill gas is conveyed to a torch system for treatment through an annular landfill gas guide and discharge main pipe; in order to prevent the landfill gas guide and discharge branch pipe and the main pipe from being pulled apart to affect the collection effect of the landfill gas and the safety of a landfill site caused by the settlement of the household garbage stack body, the invention adopts flexible connection at the connection part of the vertical guide and discharge pipe and the transverse guide and discharge pipe and the connection part of the transverse branch pipe and the main pipe, and the settlement allowance is reserved.
As shown in fig. 2-3, in this embodiment, an impermeable structure layer in a fly ash landfill is newly built above a reinforced cushion layer and a landfill gas guide layer, and a double-layer impermeable structure is adopted, and the bottom impermeable layer of the reservoir is sequentially from bottom to top: 300-500 mm thick compacted clay (second under-film protective layer), 400-700g/m2 non-woven geotextile protective layer (first under-film protective layer), 1.5-3mm HDPE geotextile impermeable layer (secondary impermeable layer), 5-8mm geotextile composite drainage net (leak detection layer), 400-700g/m2 non-woven geotextile protective layer (first under-film protective layer), 1.5-3mm HDPE geotextile impermeable layer (primary impermeable layer), 400-700g/m2 non-woven geotextile protective layer (on-film protective layer); the side slope impervious layer is sequentially from bottom to top: 400-700g/m2 of non-woven geotextile protective layer (first under-film protective layer), 1.5-3mm HDPE geotextile impermeable layer (secondary impermeable layer), 5-8mm geotextile composite drainage net (leakage detection layer), 400-700g/m2 of non-woven geotextile protective layer (first under-film protective layer), 1.5-3mm HDPE geotextile impermeable layer (main impermeable layer), 400-700g/m2 of non-woven geotextile protective layer (upper-film protective layer); the compacted clay layer can prevent the domestic garbage from depositing unevenly, the permeability coefficient is not more than 1X 10 < -7 > cm/s, and the clay layer can also play a role in seepage prevention; in order to prevent the influence of domestic garbage stack settlement on the anti-seepage system, such as pulling crack, the embodiment sets a settlement buffer zone at the junction of the bottom anti-seepage and the side slope anti-seepage, the side slope anti-seepage material reserves settlement allowance, and the side slope anti-seepage layer adopts temporary anchoring.
In the embodiment, a leaching solution guide and drainage layer in a fly ash landfill is newly built on an impermeable structure layer, a 300mm thick gravel/pebble guide layer is adopted, leaching solution guide and drainage pipes are buried in the gravel/pebble guide layer to form the leaching solution guide and drainage layer, and a pumping inclined shaft is arranged at the tail end of each leaching solution guide and drainage pipe to pump and drain generated fly ash leaching solution.
In the embodiment, the geotechnical filter screen and the HDPE geomembrane are arranged on the solution spraying guide and drainage layer of the fly ash landfill area to serve as the rain and sewage diversion membrane, the fly ash solidified material is not buried in sunny days and is not buried in rainy days, the rain and sewage diversion membrane is uncovered during landfill in a mode of distinguishing units, and the rain and sewage diversion membrane is welded after the landfill is finished, so that the yield of the fly ash spraying solution is controlled to be minimum.
In the embodiment, the newly-built domestic garbage leachate pumping well penetrates through the reinforced cushion layer, the seepage-proofing structure layer and the fly ash leaching solution guiding and draining layer, so as to prevent the fly ash leaching solution from flowing into the domestic garbage pile body from the position to be mixed with the domestic garbage leachate, the double-layer seepage-proofing film is lifted along with the dewatering well, and a settlement allowance is reserved.
In the description of the present application, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, merely to facilitate description of the present application and simplify the description, and do not indicate or imply that the devices or elements being referred to must have a specific orientation, be configured and operated in a specific orientation, and are not to be construed as limiting the present application.
The foregoing describes specific embodiments of the present invention. It is to be understood that the invention is not limited to the particular embodiments described above, and that various changes or modifications may be made by those skilled in the art within the scope of the appended claims without affecting the spirit of the invention. The embodiments of the present application and features in the embodiments may be combined with each other arbitrarily without conflict.
Claims (10)
1. The vertical partition structure of the household garbage landfill is characterized by being arranged in the household garbage landfill and comprising a fly ash landfill foundation and a fly ash landfill layer, wherein the fly ash landfill foundation is provided with a fly ash landfill area, the fly ash landfill layer is arranged in the fly ash landfill area, and the fly ash landfill area foundation comprises a plurality of layers stacked from bottom to top in sequence:
the household garbage pile body is formed by shaping the existing household garbage according to the gradient requirement of the fly ash landfill area;
a landfill gas guide bar reinforced cushion layer;
the landfill gas guide bar reinforced cushion layer comprises:
the landfill gas guide and discharge layer is used for collecting and treating landfill gas generated by the household garbage stack body;
the reinforced cushion layer is used for preventing the leakage of the seepage-proof structure layer caused by uneven sedimentation of the household garbage pile body;
the fly ash landfill layer comprises the following components stacked in sequence from bottom to top:
the anti-seepage structure layer is provided with an anti-seepage film;
the leaching solution guide and discharge layer is used for collecting and treating the fly ash leaching solution generated by the fly ash solidified material pile;
and (3) stacking the fly ash solidified matters.
2. The vertical partition structure of a household garbage landfill site according to claim 1, wherein the landfill gas guide and exhaust layer comprises a vertical landfill gas guide and exhaust system and a horizontal landfill gas guide and exhaust system, the vertical landfill gas guide and exhaust system comprises a gas guide gabion well and a vertical guide and exhaust pipe arranged in the gas guide gabion well, and the horizontal landfill gas guide and exhaust system comprises a broken stone guide and exhaust blind ditch and a horizontal guide and exhaust pipe.
3. The vertical partition structure of a domestic refuse landfill according to claim 2, wherein the lateral drainage pipe comprises a lateral branch pipe and a lateral main pipe which are communicated with each other;
the connection part of the vertical guide and discharge pipe and the connection part of the transverse branch pipe and the transverse main pipe are flexibly connected, and a settlement allowance is reserved.
4. The vertical partition structure of a landfill of claim 1, wherein the reinforcement mat comprises a crushed stone reinforcement mat.
5. The vertical partition structure of a household garbage landfill according to claim 1, wherein the fly ash landfill comprises a bottom and a side slope, and the impermeable structure layer comprises a bottom impermeable layer correspondingly arranged on the bottom and a side slope impermeable layer correspondingly arranged on the side slope;
a U-shaped sedimentation buffer zone is arranged at the joint of the reservoir bottom impermeable layer and the side slope impermeable layer;
the anti-seepage structure layer is reserved with a transverse sedimentation allowance, and the upper end of the side slope anti-seepage layer is temporarily anchored on a side slope.
6. The vertical partition structure of a household refuse landfill according to claim 1, wherein the impermeable structure layer comprises a film lower protective layer, a secondary impermeable layer, a leakage detection layer, a film lower protective layer, a main impermeable layer and a film upper protective layer which are sequentially arranged from bottom to top;
and the inner parts of the secondary impermeable layer and the main impermeable layer are respectively provided with an impermeable film.
7. The vertical partition structure of a household garbage landfill according to claim 1, wherein the leaching solution guide and discharge layer is a crushed stone or pebble guide and discharge layer, the leaching solution guide and discharge pipe is buried in the guide and discharge layer, and a pumping and discharge inclined shaft is arranged at the tail end of the leaching solution guide and discharge pipe and used for pumping and discharging the leaching solution of fly ash.
8. The vertical partition structure of a landfill of claim 6, further comprising a landfill leachate pumping well passing through the reinforcement mat layer, the impermeable structure layer and the fly ash leaching solution guiding and draining layer in sequence;
the under-film protective layer, the secondary protective layer, the under-film protective layer, the main protective layer and the over-film protective layer in the anti-seepage structure layer are fixed on the household garbage percolate pumping well and can be lifted along with the household garbage percolate pumping well.
9. A method for constructing a vertical partition structure of a household garbage landfill, characterized by adopting the vertical partition structure of a household garbage landfill according to any one of claims 1 to 8, comprising the steps of:
step 1: investigation and investigation of the household garbage landfill are carried out, and a basis is provided for the treatment of the existing household garbage landfill and the foundation treatment of the lower layer of the newly built fly ash landfill;
step 2: according to investigation and investigation conditions, treating the existing household garbage landfill;
step 3: shaping the existing household garbage according to the gradient requirement of the fly ash landfill area, and sequentially newly building a landfill gas guide and discharge layer and a reinforced cushion layer on the treated household garbage pile body to form a fly ash landfill area foundation;
step 4: a seepage-proofing structure layer is newly built in a fly ash landfill area on the foundation of the fly ash landfill area, and a settlement buffer area is newly built between the bottom seepage-proofing layer and the side slope seepage-proofing layer;
step 5: and newly creating a leaching solution guide and discharge layer on the seepage-proofing structure layer, arranging a pumping and discharge inclined shaft at the tail end of the fly ash leaching solution guide and discharge pipe, and pumping and discharging the fly ash leaching solution.
10. The method for constructing a vertical partition structure of a landfill according to claim 9, wherein in the step 4, a clay layer with a thickness of 300 mm-500 mm is disposed on the foundation of the landfill, and the impermeable structure layer is disposed on the clay layer.
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