CN103572785B - Garbage loading embeading soil property covering system, method for making and purposes that round-the-clock antiseepage is held one's breath - Google Patents
Garbage loading embeading soil property covering system, method for making and purposes that round-the-clock antiseepage is held one's breath Download PDFInfo
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Abstract
The invention provides garbage loading embeading soil property covering system, method for making and purposes that a kind of round-the-clock antiseepage is held one's breath.Soil property covering system of the present invention is layed in and the rubbish of wanted landfill or rubbish covers on gas collection layer; It is characterized in that, this soil property covering system comprises argillic horizon and capillary retardance covering layer, and this argillic horizon is positioned at this capillary blocks tectal below, and wherein this capillary retardance covering layer comprises gravel layer and powder soil horizon from lower to upper successively.This soil property covering system prevents liquid from infiltrating when the soil body is drier by the capillary retardation of this powder soil horizon and this gravel layer.More moistening with saturated at the soil body, then this argillic horizon by setting up infiltrates to prevent liquid.Under round-the-clock (any dry moisture is waited) condition, all effectively can prevent landfill gas from overflowing by this argillic horizon.Soil property covering system material therefor of the present invention is natural earth material, and have and draw materials conveniently, construction is simple, good endurance, the features such as cost is low.
Description
Technical field
The present invention relates to refuse landfill sealing covering system technical field, particularly relate to a kind of soil property covering system, preparation method and purposes of holding one's breath for the round-the-clock antiseepage of garbage loading embeading process.
Background technology
Landfill is the major way of interior disposal municipal refuse quite over a long time at present and in the future.Rubbish produces a large amount of percolates and landfill gas (main component is methane and carbon dioxide) in accumulation degradation process.Landfill gas diffuse pollution urban air, aggravation greenhouse effect, and may initiation fire and blast.The liquid such as rainwater, snow-broth infiltrates, and can aggravate leachate contamination underground water.Therefore, the major function of refuse landfill sealing covering system prevents liquid from entering to blend landfill gas effusion, and namely antiseepage is held one's breath.
Refuse landfill be generally utilize col, Plain is piled up etc. carries out landfill, mainly contains the form such as plain type and mountain valley-type.Therefore, refuse landfill sealing covering system mainly contains horizontal and ramp type two kinds of forms.The earthwork composite material covering system etc. that traditional covering system comprises single clay compaction covering layer and is made up of clay compaction layer and geomembrane, all utilizes the object that the hypotonicity of material is held one's breath to reach antiseepage.But in these traditional covering systems, argillic horizon is surperficial soil layer.Expose aerial argillic horizon when dry weather, very easily ftracture, permeability is caused to become large, thus can not enter blend landfill gas effusion (see document: " Albrecht; B. & Benson, C. (2001) .EffectofDesiccationonCompactedNaturalClays.JournalofGeo technicalandGeoenvironmentalEngineering, ASCE; 127 (1), 67 – 75. " by barrier liquid; " Albright, W., Benson; C., Gee, G.; Abichou, T., McDonald; E., Tyler, S. & Rock; S. (2006) .FieldPerformanceofaCompactedClayLandfillFinalCoverataHu midSite.JournalofGeotechnicalandGeoenvironmentalEngineer ing; ASCE, 132 (11), 1393 – 1403. ").Geomembrane then exists along interface easily slip unstability and the problem (see document: " Stark; T.D., Arellano, D.; Evans; W.D., Wilson, V.L.; andGonda; J.M. (1998) .Unreinforcedgeosyntheticclaylinercasehistory.Geosynthet icsInternational, 5 (5), 521-544. ") such as durability is not good.Therefore, the long-term behaviour of these traditional covering systems is all not fully up to expectations.
In recent years, rise hairdo soil property covering system based on moisture storage-release principle, come into one's own gradually and development.Rise hairdo soil property covering system and be mainly kind of the single particulate soil layer being implanted with vegetation in early days, under condition of raining, store moisture, in dry conditions by evaporation from land and plant transpiration effect release moisture.But, this single soil layer type is risen hairdo covering system and is only applicable to the little arid area of rainfall, and required soil thickness is thicker, the thick 2m(that reaches is see document: " Benson; C.H. & Khire; M.V. (1995) .Earthencoversforsemi-aridandaridclimates.GeotechnicalSp ecialPublication, No.53,201-217. ").Therefore, capillary accumulation type is risen hairdo soil property covering system and is developed (see document: " Khire; M.V.; Benson; C.H. & Bosscher; P.J. (2000) .Capillarybarriers:designvariablesandwaterbalance.Journa lofGeotechnicalandGeoenvironmentalEngineering, ASCE, 126 (8): 695 – 708. "; " Aubertin, M., Cifuentes; E.; Apithy, S.A., Bussiere; B.; Molson, J. & Chapuis, R.P. (2009) .Analysesofwaterdiversionalonginclinedcoverswithcapillar ybarriereffects.CanadianGeotechnicalJournal; 46 (10), 1146-1164. "; " Rahardjo; H., Santoso, V.A.; Leong; E.C., Ng, Y.S. & Hua; C.J. (2012) .Performanceofaninstrumentedslopecoveredbyacapillarybarr iersystem.JournalofGeotechnicalandGeoenvironmentalEngine ering; ASCE, 138 (4), 481-490. ").Capillary retardance covering system is made up of one deck coarse-grained soil sleeping under one deck fine grained soils under unsaturated state, utilizes the capillary retardation at thickness grain soil layer interface place to increase the storage capacity of top particulate soil layer, improves lateral drainage capacity, reduce rain infiltration.Described unsaturated state, referring to existing water in soil body hole has gas again, and the state that in the soil body, the gentle difference of water is communicated with separately.Result of study shows, capillary retardance covering system can reach effective antiseepage function in arid and semiarid climatic region, but it is not good (see document: " Benson; C.H. & Khire; M.V. (1995) .Earthencoversforsemi-aridandaridclimates.GeotechnicalSp ecialPublication; No.53,201-217. " at moist climate region anti-seepage effect; " Benson; C.H.; Albright; W.H.; Roesler, A.C. & Abichou, T. (2002) .Evaluationoffinalcoverperformance:fielddatafromtheAlter nativeCoverAssessmentProgram (ACAP) .Proc.WasteManagement; Vol.2,1-15. ").
Afterwards, scholar is had to propose to block the method for setting up unsaturation lead layer in the middle of tectal thickness grain soil layer in capillary, improve its lateral drainage capacity further (see document: " Stormonont; J.C. & Morris; C.E. (1997) .Unsaturateddrainagelayersfordiversionofinfiltratingwate r.JournalofIrrigationandDrainageEngineering; ASCE, 123 (5), 364-367. "; " Deng Linheng, Zhan Liangtong, Chen Yunmin, Jia Guanwei (2012). containing the capillary accumulation type covering layer performance model experimental study of unsaturation lead layer. geotechnical engineering journal, the 34th volume, the 1st phase, 75-80. ").The open CN102493496A(application number of Chinese patent application is No.201110441895.9, and denomination of invention be " a kind of capillary blockage cover layer structure with lateral drainage capacity ") in be exactly utilize to set up the method for unsaturation layer of sand to improve its lateral drainage capacity at powder soil horizon and macadam centre.But this covering system is still only applicable to the situation that the soil body is in unsaturated state.When cylinder water content native under long-time intense rainfall condition close to saturated or reach capacity state time, this covering system will lose effect of antiseepage.In addition, this covering system is ramp type, and as adopted horizontal, then its anti-seepage effect exists query.This covering system is provided with vegetable layer for attractive in appearance on top layer, be provided with geotechnological layer of cloth and prevent sand from embedding rubble, but do not have practical function for refuse landfill antiseepage in the middle of layer of sand and macadam.
In addition, very important point is, above-mentioned tradition and the retardance of the capillary after improving covering system all can not effectively prevent landfill gas from overflowing, function of namely not holding one's breath.
Up to now, do not have a kind of covering system can be issued at any weather conditions the function that long-term antiseepage holds one's breath, especially can not effectively prevent landfill gas from overflowing and can not effectively prevent liquid from infiltrating under the soil body is close to saturated or the state that reaches capacity.
Summary of the invention
The object of the invention is to overcome above-mentioned defect, a kind of refuse landfill sealing soil property covering system of novel Weatherproof multifunctional is provided, is applicable to any weather conditions, can effectively prevent liquid from infiltrating, can effectively prevent landfill gas from overflowing again, and there is good durability.
For solving the problems of the technologies described above, the invention provides a kind of soil property covering system, preparation method and purposes of holding one's breath for the round-the-clock antiseepage of garbage loading embeading process.
Specifically, the invention provides:
(1) for a soil property covering system for garbage loading embeading, it is layed on the rubbish of wanted landfill, or when being coated with gas collection layer on this rubbish, is then layed on this gas collection layer; It is characterized in that, this soil property covering system comprises argillic horizon and capillary retardance covering layer, and described argillic horizon is positioned at described capillary blocks tectal below, and is positioned at the top of the rubbish of wanted landfill; Wherein, described capillary retardance covering layer comprises gravel layer and powder soil horizon, and described powder soil horizon is positioned at the top of described gravel layer.
(2) the soil property covering system Gen Ju (1), is characterized in that, described argillic horizon is through compaction treatment, and wherein said compaction treatment is included in optimum water content and carries out compacting.
(3) the soil property covering system Gen Ju (1), is characterized in that, the thickness of described argillic horizon is 0.3-0.8m, and the soil body particle diameter of described argillic horizon is less than 0.075mm, and the saturation water transmission coefficient of described argillic horizon is not higher than 1 × 10
-9m/s.
(4) the soil property covering system Gen Ju (1), is characterized in that, the thickness of described gravel layer is 0.2-0.3m, and the soil body particle diameter of described gravel layer is 0.5-5mm, and the saturation water transmission coefficient of described gravel layer is not less than 1 × 10
-4m/s.
(5) the soil property covering system Gen Ju (1), is characterized in that, the thickness of described powder soil horizon is 0.3-0.6m, and the soil body particle diameter of described powder soil horizon is not more than 2mm, and the saturation water transmission coefficient of described powder soil horizon is 1 × 10
-8-1 × 10
-5m/s.
(6) the soil property covering system Gen Ju (1), is characterized in that, this soil property covering system is horizontal or ramp type, and the gradient of ramp type is: Vertical dimension and level are to than being not more than 1:3.
(7) the soil property covering system Gen Ju (1), is characterized in that, this soil property covering system is horizontally provided with one gutter every 20-40m.
(8) a kind of preparation method according to the soil property covering system in (1)-(7) described in any one, the method comprises:
1) provide there is the horizontal of flat surface or the msw landfill of ramp type;
2) alternatively, the surface of described msw landfill is laid gas collection layer (such as, one deck be made up of rubble gas collection layer);
3) on the surface of described gas collection layer (if having this layer) or msw landfill (if when not having gas collection layer), lay argillic horizon, carry out smooth process in optimum water content compacting;
4) on the surface of described argillic horizon, lay gravel layer, compacting also carries out smooth process; And
5) on the surface of described gravel layer, lay powder soil horizon, compacting also carries out smooth process, thus obtains described soil property covering system.
(9) according to the purposes of the soil property covering system in (1)-(7) described in any one for preventing liquid from infiltrating msw landfill under round-the-clock (any dry moisture is waited) condition.
(10) according to the purposes of soil property covering system for preventing gas from overflowing from msw landfill under all weather conditions in (1)-(7) described in any one.
Method of the present invention compared with prior art has the following advantages and good effect:
(1) under what connection wet weather conditions in office, particularly the soil body close to saturated or reach capacity state time, can effectively prevent liquid (particularly rainwater) from infiltrating msw landfill;
(2) under any weather conditions, can effectively prevent landfill gas from overflowing;
(3) soil property covering system composition material of the present invention is natural earth material, abundance, and draw materials conveniently, cost is low;
(4) soil property covering system construction of the present invention is simple, good endurance, and later maintenance cost is low;
(5) soil property covering system of the present invention can be used for the msw landfill of horizontal and ramp type, and particularly, even if msw landfill is horizontal, soil property covering system of the present invention also effectively can reach the effect that round-the-clock antiseepage is held one's breath.
Accompanying drawing explanation
Fig. 1 is that the structure composition of soil property covering system of the present invention and antiseepage are held one's breath principle schematic;
Fig. 2 is the relation function schematic diagram of each soil layer water permeability coefficient and suction in soil property covering system of the present invention;
Fig. 3 is the relation function schematic diagram of each soil layer throughput and air pressure in soil property covering system of the present invention;
Fig. 4 is the numerical simulation result figure as the unified object lesson of capillary retardance covering system compared;
Fig. 5 is the numerical simulation result figure of an object lesson of soil property covering system of the present invention;
Fig. 6 is the soil column tests result figure of an object lesson of the barrier performance of soil property covering system of the present invention;
Fig. 7 is the soil column tests result figure of an object lesson of the performance of holding one's breath of soil property covering system of the present invention;
Reference numeral in the various figures represents respectively: 1 is powder soil horizon, and 2 is gravel layer, and 3 is argillic horizon, and 4 is optional gas collection layer, and 5 is msw landfill, and 6 is landfill gas, and 7 is current, and 8 is soil property covering system, and 9 is geotextiles, and 10 is gutter, S
1for the suction value that powder soil horizon is corresponding with gravel layer water permeability coefficient function crosspoint, S
2for the suction value that gravel layer is corresponding with argillic horizon water permeability coefficient function crosspoint, A is the air-entry value of argillic horizon.
Detailed description of the invention
Below by way of detailed description of the invention description and the invention will be further described with reference to accompanying drawing, but this is not limitation of the present invention, those skilled in the art are according to basic thought of the present invention, various amendment or improvement can be made, but only otherwise depart from basic thought of the present invention, all within the scope of the present invention.
Existing capillary retardance covering system all can not be issued at any weather conditions the function that long-term antiseepage holds one's breath, and especially can not effectively prevent landfill gas from overflowing and can not effectively prevent liquid from infiltrating under the soil body is close to saturated or the state that reaches capacity.And the present inventor is surprised to find, as long as set up one deck argillic horizon below the capillary retardance covering layer be made up of powder soil horizon and gravel layer, particularly clay compaction layer, just can under any weather conditions, particularly the soil body close to saturated or reach capacity state time, effectively prevent liquid (particularly rainwater) from infiltrating msw landfill, and effectively prevent landfill gas from overflowing.
And if argillic horizon is arranged on the top layer of covering system, then can not reach the effect that long-term antiseepage is held one's breath under any weather conditions.This is because, when dry weather, expose aerial argillic horizon and very easily ftracture, cause permeability to become large, thus can not infiltrate or gas effusion by barrier liquid again.In the present invention, argillic horizon is arranged on the bottom of covering system, i.e. the below of powder soil horizon and gravel layer, and saturation ratio is higher, therefore there is not the problem of season cracking.
In this article, " round-the-clock " refers to any weather conditions, comprises any dry moisture and waits, more specifically, comprising: moistening, half moistening, semiarid, dry climate condition.
In this article, " soil body " refers to argillic horizon, gravel layer, powder soil horizon or their general name in covering system of the present invention.
Definition and the division of described herein " silt ", " gravelly sand " and " clay " are known in the art, specifically can see National Standard of the People's Republic of China's " soil engineering classification standard GB/T50145-2007 " and " Code for design of building GB50007-2002 ", wherein mainly to determine according to particle size distribution range.
In this article, " liquid " refers to comprise the various forms of liquid such as rainwater, snow-broth.
Specifically, the invention provides a kind of soil property covering system of holding one's breath for the round-the-clock antiseepage of garbage loading embeading process, it comprises argillic horizon, gravel layer and powder soil horizon; It is characterized in that, described argillic horizon, gravel layer and powder soil horizon are layed on the rubbish of wanted landfill from lower to upper successively, or when being coated with gas collection layer on this rubbish, then be layed on this gas collection layer, the capillary namely formed at described gravel layer and described powder soil horizon blocks below covering layer sets up argillic horizon described in one deck.
Preferably, described argillic horizon is through compaction treatment, and wherein said compaction treatment is included in optimum water content and carries out compacting.
The definition of described herein " optimum water content " is known in the art, water content corresponding when it refers to and reaches maximum density according to compaction test soil body under certain compaction conditions (specifically can see National Standard of the People's Republic of China " " Standard for test methods of earthworks " GB/T50123-1999 ").
Fig. 1 schematically shows a kind of soil property covering system 8 of the present invention, and it lays composition from lower to upper successively primarily of argillic horizon 3, gravel layer 2 and powder soil horizon 1, and the capillary namely formed at powder soil horizon 1 and gravel layer 2 blocks below covering layer sets up one deck argillic horizon 3.
Also preferably, the thickness of described argillic horizon 3 is 0.3-0.8m, and the soil body particle diameter of described argillic horizon is less than 0.075mm, and the saturation water transmission coefficient of described argillic horizon is not higher than 1 × 10
-9m/s; The thickness of described gravel layer is 0.2-0.3m, and the soil body particle diameter of described gravel layer is 0.5-5mm, and the saturation water transmission coefficient of described gravel layer is not less than 1 × 10
-4m/s; The thickness of described powder soil horizon is 0.3-0.6m, and the soil body particle diameter of described powder soil horizon is not more than 2mm, and the saturation water transmission coefficient of described powder soil horizon is 1 × 10
-8-1 × 10
-5m/s.Soil thickness scope obtains by Parameter analysis, such as, numerical simulation software known in the art (such as, GeoStudio2007 software, can derive from and be positioned at Canadian GEO-SLOPE company) can be adopted to carry out.Different soil thickness and different water permeability coefficient can be adopted to carry out Parameter analysis, thus can obtain can reaching best antiseepage to hold one's breath the soil thickness scope of effect from being saturated to dry any weather conditions.
Also preferably, this soil property covering system can be horizontal or ramp type, and the gradient of ramp type is: Vertical dimension and level are to than being not more than 1:3.
Also preferably, this soil property covering system is laid on the msw landfill of level or cyphosomatic shape, and the gradient of slope body is: Vertical dimension and level are to than being not more than 1:3.
In the present invention, the area size of soil property covering system is not particularly limited, those skilled in the art can (actual size as msw landfill) select according to actual needs, and horizontally can arrange one gutter every 20-40m to this soil property covering system as required.When weather is very arid for a long time, the method for recharging can be adopted to pour into gravel layer thus moistening argillic horizon at body top, slope Jiang Shui.The setting in gutter and recharge method can adopt the conventional means of this area or method to carry out.
In addition, for soil property covering system of the present invention, when the particle diameter of adjacent two layers soil body particle differs greatly, optionally can lay ventilative permeable geotechnological layer of cloth 9, mix mutually to prevent the particle between different soil.Such as, when the mean particle size difference of powder soil horizon and gravel layer is greater than 5 times, geotechnological layer of cloth can be laid between powder soil horizon and gravel layer, prevent silt particle from embedding gravel layer.Similarly, when the mean particle size difference of gravel layer and argillic horizon is greater than 5 times, geotechnological layer of cloth can be laid between gravel layer and argillic horizon.
In addition, when soil property covering system of the present invention is applied to msw landfill, optionally gas collection layer can be laid on msw landfill.Gas collection layer is that prior art is known, and it spreads for the gas transfer making msw landfill produce, thus is conducive to improving gas collection efficiency, and therefore, gas collection layer also can be called as gas diffusion layers.Gas collection layer can be made up of rubble, but is not limited thereto.
Present invention also offers the preparation method of described soil property covering system, the method comprises:
1) provide there is the horizontal of flat surface or the msw landfill of ramp type;
2) alternatively, the surface of described msw landfill is laid gas collection layer (such as, one deck be made up of rubble gas collection layer);
3) on the surface of described gas collection layer (if having this layer) or msw landfill (if when not having gas collection layer), lay argillic horizon, carry out smooth process in optimum water content compacting;
4) on the surface of described argillic horizon, lay gravel layer, compacting also carries out smooth process; And
5) on the surface of described gravel layer, lay powder soil horizon, compacting also carries out smooth process, thus obtains described soil property covering system.
Preferably, soil property covering system of the present invention can use (see Fig. 1) according to following steps:
1) surface of smooth msw landfill 5;
2) alternatively, the surface of msw landfill 5 is laid gas collection layer 4(such as, the gas collection layer that one deck is made up of rubble);
3) if lay argillic horizon 3(do not have gas collection layer 4 on the surface of gas collection layer 4, then on the surface of msw landfill 5, argillic horizon 3 is laid), after optimum water content compacting, carry out smooth process;
4) on the surface of argillic horizon 3, lay gravel layer 2, compacting also carries out smooth process;
5) on the surface of gravel layer 2, lay powder soil horizon 1, compacting also carries out smooth process.
Present invention also offers the purposes of described soil property covering system for preventing liquid (particularly rainwater) from infiltrating msw landfill under all weather conditions.Present invention also offers the described purposes of soil property covering system for preventing gas from overflowing from msw landfill under all weather conditions.
The antiseepage function of soil property covering system of the present invention can be realized by following principle:
Those skilled in the art it is understood that, the soil body is dry from being saturated to, desaturation, water content reduces, corresponding suction then increases, and the water permeability coefficient of soil increases with suction and reduces (see document: " Ng, C.W.W. & Menzies; B. (2007) .AdvancedUnsaturatedSoilMechanicsandEngineering.Taylor & Francis, LondonandNY.ISBN:978-0-415-43679-3.687p. ").
The definition of described herein " suction " is known in the art, and it refers to the difference of gas pressure and water pressure in the soil body.
The definition of described herein " saturation ratio " is known in the art, and it refers to the ratio of volume that in soil body hole, water accounts for and soil body voids volume.
The definition of described herein " water permeability coefficient " is known in the art, and it refers to the unit discharge under specific potential gradient in the soil body, and its numerical value unit can be " m/s ".
The definition of described herein " saturation water transmission coefficient " is known in the art, water permeability coefficient corresponding when it refers to, and the soil body reaches capacity (namely saturation ratio is 100%).
Figure 2 shows that the relation function schematic diagram of each soil layer water permeability coefficient and suction in soil property covering system.Be described referring to Fig. 2.
(1) when the suction of the soil body in soil property covering system is less than S
1, when being namely in moist climate condition, water content of soil is higher, is in saturated or close to saturation state, the water permeability coefficient of gravel layer 2 is the highest, and the water permeability coefficient of argillic horizon 3 is minimum.Because the water permeability coefficient of gravel layer 2 is higher than the water permeability coefficient of powder soil horizon 1, capillary retardation lost efficacy, so time rely on the ultralow water permeability of argillic horizon 3 to prevent rainwater from infiltrating msw landfill.On the other hand, because the water permeability coefficient of gravel layer 2 is maximum, therefore lateral drainage mainly occurs in gravel layer 2, as shown in Figure 1.
(2) when the suction of the soil body in soil property covering system is between S
1with S
2between (see Fig. 2), when being namely in grassland climate condition, the soil body is more moistening, and the water permeability coefficient of powder soil horizon 1 is the highest, and the water permeability coefficient of argillic horizon 3 is minimum.Because the water permeability coefficient of powder soil horizon 1 is maximum, therefore lateral drainage mainly occurs in powder soil horizon 1.But still part water may be had to infiltrate in gravel layer 2, so still need to rely on the ultralow water permeability of argillic horizon 3 to prevent rainwater from infiltrating msw landfill.
(3) when the suction of the soil body in soil property covering system is greater than S
2, when being namely in semiarid or arid climatic conditions, the soil body is drier, and the water permeability coefficient of powder soil horizon 1 is far above the water permeability coefficient of gravel layer 2, and capillary retardation comes into force.Rainwater major storage is drained along slope side direction in powder soil horizon 1 or in powder soil horizon 1, and does not infiltrate in gravel layer 2, thus does not infiltrate msw landfill.
The function of holding one's breath of soil property covering system of the present invention is realized by following principle:
Figure 3 shows that the relation function schematic diagram of each soil layer throughput and landfill gas air pressure in soil property covering system.Be described referring to Fig. 3.When landfill gas air pressure is lower, in the soil body, throughput is almost nil, and throughput increases with landfill gas air pressure and increases rapidly afterwards.Be the disruptive pressure of argillic horizon 3 for A point in argillic horizon 3, figure or be called air-entry value, atmospheric pressure value corresponding when namely gas starts to enter the soil body.When landfill gas air pressure is lower than A, landfill gas cannot enter the soil body, and in argillic horizon 3, throughput is almost nil.When landfill gas air pressure is greater than A, gas starts to enter argillic horizon 3, and throughput increases rapidly.In soil property covering system, the disruptive pressure (i.e. air-entry value) of argillic horizon 3 is the highest, and argillic horizon 3 is at bottom, directly contacts (see Fig. 1) with landfill gas 6.The air pressure of landfill gas 6 usually below 20kPa (see document: " and Wei Haiyun (2007). city life garbage landfill gas migration law study. Zhejiang University's thesis for the doctorate. ").Therefore, clay compaction layer 3, makes the air pressure that its disruptive pressure (i.e. air-entry value) A produces higher than landfill gas 6, then can effectively prevent landfill gas from overflowing.
Mode below by way of example further explains and describes content of the present invention, but these examples should not be understood to the restriction to protection scope of the present invention.
Example one
In following example, adopt GeoStudio2007 software (can derive from and be positioned at Canadian GEO-SLOPE company) to carry out numerical simulation.GeoStudio software is the simulation software for geotechnical engineering and Geotechnical Environment analog computation.It is reported, this software is adopted to carry out numerical simulation to refuse landfill and soil property covering system, discovery analog result and true model result of the test are coincide very much (see document: " and Jia Guanwei (2010). in the end soil property covering layer of solid waste stockyard, Moisture migration and regulate and control method are studied. Zhejiang University's thesis for the doctorate. ").
Comparative example 1
As a comparison, first simulate traditional capillary retardance covering system, namely only adopting powder soil horizon and gravel layer as covering system, is gravel layer below powder soil horizon.Wherein the thickness of gravel layer is 0.3m, and soil body particle diameter is 0.5-5mm, and saturation water transmission coefficient is 2 × 10
-4m/s; The thickness of powder soil horizon is 0.3m, and soil body particle diameter is not more than 2mm, and saturation water transmission coefficient is 3 × 10
-6m/s.Gradient Vertical dimension and level are to than being 1:3.
Adopt GeoStudio2007 software to carry out numerical simulation, weather conditions are set to: apply heavy showers, its intensity is 100mm/ hour, continue 2 hours.As shown in Figure 4, in figure, the direction of arrow characterizes water (flow) direction to result, and arrow size characterizes the size of water velocity.This result demonstrates traditional capillary retardance covering system under intense rainfall condition, and namely the soil body is close to saturated or when reaching capacity, and can not prevent rainwater from infiltrating msw landfill.
Embodiment 1
In a kind of soil property covering system of the present invention, below traditional capillary retardance covering system that powder soil horizon and gravel layer form, set up one deck argillic horizon.The thickness of argillic horizon is 0.3m, and soil body particle diameter is less than 0.075mm, and saturation water transmission coefficient is 1 × 10
-9m/s; The thickness of gravel layer is 0.3m, and soil body particle diameter is 0.5-5mm, and saturation water transmission coefficient is 2 × 10
-4m/s; The thickness of powder soil horizon is 0.3m, and soil body particle diameter is not more than 2mm, and saturation water transmission coefficient is 3 × 10
-6m/s.Gradient Vertical dimension and level are to than being 1:3.
Adopt GeoStudio2007 software to carry out numerical simulation, weather conditions are set to: apply heavy showers, its intensity is 100mm/ hour, continue 2 hours.As shown in Figure 5, in figure, the direction of arrow characterizes water (flow) direction to result, and arrow size characterizes the size of water velocity.This result demonstrates soil property covering system of the present invention under intense rainfall condition, and namely the soil body is close to saturated or when reaching capacity, and the ultralow water permeability of argillic horizon can be utilized effectively to prevent rainwater from infiltrating msw landfill.
Embodiment 2
In a kind of soil property covering system of the present invention, the thickness of argillic horizon is 0.5m, and soil body particle diameter is less than 0.075mm, and saturation water transmission coefficient is 1 × 10
-9m/s; The thickness of gravel layer is 0.2m, and soil body particle diameter is 0.5-5mm, and saturation water transmission coefficient is 1 × 10
-3m/s; The thickness of powder soil horizon is 0.3m, and soil body particle diameter is less than 2mm, and saturation water transmission coefficient is 1 × 10
-8m/s.Gradient Vertical dimension and level are to than being 1:4.
Adopt GeoStudio2007 software to carry out numerical simulation, weather conditions are set to: apply heavy showers, its intensity is 70mm/ hour, continue 4 hours.Result demonstrates soil property covering system of the present invention can under intense rainfall condition, and namely the soil body is close to saturated or when reaching capacity, and effectively prevents rainwater from infiltrating msw landfill.
Example two
In following example, the antiseepage adopting one dimension earth pillar to carry out laboratory test checking horizontal soil property covering system is held one's breath performance.When preparing earth pillar, bottom argillic horizon and its on gravel layer carry out compacting by optimum water content and 95% degree of compaction, top powder soil horizon carries out compacting by optimum water content and 80% degree of compaction, then airtight earth pillar lower channel, makes every layer soil body moisture distribution as far as possible evenly.Carrying out antiseepage or Air-tight Test by controlling the upper and lower border of earth pillar, in process of the test, carrying out the measurement along covering layer different depth of pore water pressure, pore air pressure and water content respectively.
Embodiment 1
Carry out the test of one dimension earth pillar rainfall simulation to a kind of soil property covering system of the present invention, the thickness of argillic horizon is 0.4m, and soil body particle diameter is less than 0.075mm, and saturation water transmission coefficient is lower than 1 × 10
-9m/s; The thickness of gravel layer is 0.2m, and soil body particle diameter is 0.5-5mm, and saturation water transmission coefficient is higher than 1 × 10
-4m/s; The thickness of powder soil horizon is 0.4m, and soil body particle diameter is less than 2mm, and saturation water transmission coefficient is 5 × 10
-7m/s.Rainfall is applied above covering system, volumetric(al) moisture content after experienced by the rainfall of varying strength in covering system distributes as shown in Figure 6, wherein, rainfall intensity " x mono-meets " is determined (see document: " Lam; C.C.andLeung; Y.K. (1995) .Extremerainfallstatisticsanddesignrainstormprofilesatse lectedlocationsinHongKong.TechnicalNoteNo.86; RoyalObservatory, HongKong. ") with reference to Hongkong Climate data document.Even if under meeting even higher rainfall intensity at 200 years one, the water content of the argillic horizon bottom soil body in covering system still remains unchanged substantially.This explanation is generally the covering system of 120 years for design period, in its Years Of Service, rainwater can not penetrate argillic horizon.
Embodiment 2
Carry out gas breakdown test to the argillic horizon in a kind of soil property covering system of the present invention, the thickness of argillic horizon is 0.4m, and soil body particle diameter is less than 0.075mm, and saturation water transmission coefficient is lower than 1 × 10
-9m/s.Atmospheric pressure (illustrating with abscissa " bottom gas pressure " in the figure 7) is applied, throughput change (illustrating with ordinate " top gas flow " in the figure 7) on observation argillic horizon top below argillic horizon.Result of the test as shown in Figure 7, under argillic horizon saturation state (i.e. saturation ratio 100%, namely at moistening weather conditions), still fails to puncture argillic horizon even if atmospheric pressure reaches 50kPa; The argillic horizon (namely at moistening, semi-humid weather conditions) of saturation ratio 80%, its disruptive pressure is about 35kPa; The argillic horizon of saturation ratio 60%, disruptive pressure is about 22kPa.Because landfill gas pressure in refuse landfill is under normal circumstances at below 20kPa, even if so under the weather conditions of soil body drying, the saturation ratio of argillic horizon is 60%, still effectively can prevent the effusion of rubbish landfill gas.
Claims (9)
1. for a soil property covering system for garbage loading embeading, it is layed on the rubbish of wanted landfill, or is then layed in when being coated with gas collection layer on described rubbish on this gas collection layer; It is characterized in that, this soil property covering system comprises argillic horizon and capillary retardance covering layer, and described argillic horizon is positioned at described capillary blocks tectal below, and is positioned at the top of the rubbish of wanted landfill; Wherein, described capillary retardance covering layer comprises gravel layer and powder soil horizon, and described powder soil horizon is positioned at the top of described gravel layer; The thickness of described argillic horizon is 0.3-0.8m, and the soil body particle diameter of described argillic horizon is less than 0.075mm, and the saturation water transmission coefficient of described argillic horizon is not higher than 1 × 10
-9m/s.
2. soil property covering system according to claim 1, is characterized in that, described argillic horizon is through compaction treatment, and wherein said compaction treatment is included in optimum water content and carries out compacting.
3. soil property covering system according to claim 1, is characterized in that, the thickness of described gravel layer is 0.2-0.3m, and the soil body particle diameter of described gravel layer is 0.5-5mm, and the saturation water transmission coefficient of described gravel layer is not less than 1 × 10
-4m/s.
4. soil property covering system according to claim 1, is characterized in that, the thickness of described powder soil horizon is 0.3-0.6m, and the soil body particle diameter of described powder soil horizon is not more than 2mm, and the saturation water transmission coefficient of described powder soil horizon is 1 × 10
-8-1 × 10
-5m/s.
5. soil property covering system according to claim 1, is characterized in that, this soil property covering system is horizontal or ramp type, and the gradient of described ramp type is: Vertical dimension and level are to than being not more than 1:3.
6. soil property covering system according to claim 1, is characterized in that, this soil property covering system is horizontally provided with one gutter every 20-40m.
7., according to a preparation method for the soil property covering system in claim 1-6 described in any one, the method comprises:
1) provide there is the horizontal of flat surface or the msw landfill of ramp type;
2) alternatively, the surface of described msw landfill is laid gas collection layer;
3) on the surface of described msw landfill, lay argillic horizon, or then on the surface of this gas collection layer, lay argillic horizon when being provided with described gas collection layer, carry out smooth process in optimum water content compacting;
4) on the surface of described argillic horizon, lay gravel layer, compacting also carries out smooth process; And
5) on the surface of described gravel layer, lay powder soil horizon, compacting also carries out smooth process, thus obtains described soil property covering system.
8. according to the purposes of the soil property covering system in claim 1-6 described in any one for preventing liquid from infiltrating msw landfill under all weather conditions.
9. according to the purposes of soil property covering system for preventing gas from overflowing from msw landfill under all weather conditions in claim 1-6 described in any one.
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| CN201310339617.1A CN103572785B (en) | 2012-08-06 | 2013-08-06 | Garbage loading embeading soil property covering system, method for making and purposes that round-the-clock antiseepage is held one's breath |
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| CN104438276B (en) * | 2014-11-27 | 2017-03-22 | 河南省电力勘测设计院 | Refuse landfill cover layer |
| CN105642642B (en) * | 2016-01-27 | 2018-03-06 | 辽宁工程技术大学 | A kind of composite closure structure of the Mine Solid Wastes landfill field of sulfur compound |
| CN106120813B (en) * | 2016-06-27 | 2018-01-30 | 中国矿业大学 | It is a kind of to avoid seepage flow water barrier from forming discharge method in the opencut with capillary effect |
| CN107091916B (en) * | 2017-04-17 | 2019-12-10 | 武汉大学 | covering layer structure optimization method for adjusting landfill seepage through plant dissipation |
| CN107570522A (en) * | 2017-10-18 | 2018-01-12 | 中国地质大学（武汉） | A kind of multi-functional tectum structure and its application in refuse landfill |
| CN108941145B (en) * | 2018-06-25 | 2021-12-17 | 广州市香港科大霍英东研究院 | Intermediate covering layer of refuse landfill and preparation method and application thereof |
| CN108914979B (en) * | 2018-06-25 | 2020-10-16 | 广州市香港科大霍英东研究院 | Landfill capping layer and preparation method and application thereof |
| CN109047267A (en) * | 2018-09-27 | 2018-12-21 | 苏州金螳螂园林绿化景观有限公司 | Degeneration system is polluted in refuse landfill |
| CN111636443B (en) * | 2020-04-26 | 2021-12-07 | 合肥工业大学 | Guiding and sucking type swelling soil slope shallow water control covering system based on capillary retardation mechanism |
| CN115012454B (en) * | 2022-05-11 | 2023-11-07 | 武汉轻工大学 | Solid waste base composite refuse landfill covering barrier system and preparation method thereof |
| CN114912158B (en) * | 2022-05-13 | 2023-02-14 | 华中科技大学 | Design method of soil covering layer of solid waste landfill with consideration of plant root system effect |
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