CN101717614A - Equivalent anti-infiltration material of landfill liner and equivalent anti-infiltration method - Google Patents
Equivalent anti-infiltration material of landfill liner and equivalent anti-infiltration method Download PDFInfo
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- CN101717614A CN101717614A CN200910117599A CN200910117599A CN101717614A CN 101717614 A CN101717614 A CN 101717614A CN 200910117599 A CN200910117599 A CN 200910117599A CN 200910117599 A CN200910117599 A CN 200910117599A CN 101717614 A CN101717614 A CN 101717614A
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Abstract
The invention relates to the technical field of disposal of anti-infiltration systems of domestic waste sanitary landfills, in particular to an equivalent anti-infiltration material of a landfill liner; and the invention further relates to an equivalent anti-infiltration method of the landfill liner. The equivalent anti-infiltration material of the landfill liner is characterized in that the equivalent anti-infiltration material consists of the following raw materials by weight percent: 86-90% of Lanzhou loess or Yulin loess and 10-14% of bentonite. The equivalent anti-infiltration method of the landfill liner is characterized in that 86-90% of Lanzhou loess or Yulin loess and 10-14% of bentonite are used for preparing the liner material, the liner material is compacted, and the thickness of a lining pad is 220-300cm. The description of the invention is as follows: when the infiltration coefficient of the lining pad is greater than the requirement of the specification, the thickness of the liner can be appropriately increased, thereby prolonging the infiltration path of pollutants in the lining pad and intercepting and blocking the pollutants by utilizing the absorption property of a soil body to the pollutants, and further achieving the equivalent pollution control effect.
Description
Technical field the present invention relates to domestic refuse sanitary filling field seepage control system disposal technology field, is specifically related to landfill liner equivalent anti-infiltration material; The invention still further relates to the landfill liner equivalent anti-infiltration method.
It is reform to traditional dumping method that background technology domestic refuse health is filled out logos, is the needs of modern economy construction development and civilization construction, can reduce the pollution of rubbish to surrounding enviroment, is the needs of environment protection.
Along with constant development of economy; the output of China's solid waste constantly increases; bring disadvantageous effect to the environment protection meeting; in order to control the problem of environmental pollution that solid waste causes; China has successively put into effect and a series of it has been prevented the relevant regulations of smelting, for the management of strengthening solid waste lays the first stone.The essence of waste landfill is to adopt the method for civil engineering work to seal waste, with the diffusion control of pollutent under specific zone and the level that can accept.
China's " domestic refuse Sanitary Landfill Technology standard " (GJJ17-2004) and " domestic refuse sanitary filling field seepage control system engineering legislation " (CJJ113-2007) in the regulation, the impervious barrier of household refuse landfill sites can adopt natural impervious material or artificial impervious material, and its permeability coefficient all should satisfy k≤1.0 * 10
-7Cm/s, and the compacted soil layer thickness must not be less than 2m.From the angle of engineering design, no matter adopt which kind of impervious material, lining is must permeability coefficient little, good stability, low price.Comparatively speaking, under the situation that loess area antiseepage earth material obtains easily, natural impervious material is more more economical than artificial impervious material.
Generally speaking, can both satisfy the anti-requirement of strength that blends of lining after most of clay compacting.Therefore, China's related specifications regulation, lining compacting soil layer should adopt clay.But for NORTHWEST CHINA loess, desert, area, Gobi desert, the clay that is fit to the making lining is but very deficient, if way far away is bought and the transportation clay, the disposal site cost will obviously rise.
China's related specifications is also stipulated, when the native clay resource shortage, can use the soil of other type.This means, make full use of local earth material,, might reduce its perviousness simply, economically, realize the anti-seepage standard of code requirement by the engineering ameliorative measure.Strive the impervious material localization, be that waste is sealed the international basic theory problem in facilities design field always, also is the urgent day by day engineering roadblock that this field of China occurs.
2007 " domestic refuse sanitary filling field seepage control system engineering legislation " (CJJ 113-2007) expand to other types soil outside clay and the clay with domestic refuse sanitary filling field impervious barrier.That is to say that satisfying thickness (h) greater than 2m, permeability coefficient (k) is less than or equal to 10
-7Under the prerequisite of cm/s, allow to use all possible soil material.
Under the tale quale, NORTHWEST CHINA wide geographic area sanitary filling field development falls behind, and one of them limitation reason is exactly that to can be used for the top layer clay resource of sanitary filling field practice of construction very deficient, and the antiseepage lining material can not get good solution.
Though the Northwest's clay resource scarcity, the loess resource is very abundant, if can utilize modification instead of clay, yellow earth lining to realize " impervious material localization ", has great economy and practical value undoubtedly.
The present invention be exactly with loess as research object, turn to core with waste landfill yard lining impervious material native country, loess area, solve the technical problem of modification loess as waste landfill yard lining.
The summary of the invention the technical problem to be solved in the present invention is to provide a kind of gathers materials on the spot, satisfies the landfill liner equivalent anti-infiltration material of anti-permeability performance technical requirements, and the present invention also provides a kind of landfill liner equivalent anti-infiltration method.
A kind of landfill liner equivalent anti-infiltration material is characterized in that being made up of following weight percentages;
Lanzhou loess or Yulin loess 86～90%,
Wilkinite 10～14%.
A kind of landfill liner equivalent anti-infiltration method is characterized in that with Lanzhou loess or Yulin loess 86～90%, and wilkinite 10～14% is as lining material, compacting lining material, 220～300 centimetres of liner thickness.
Landfill liner equivalent anti-infiltration method provided by the invention has proposed " polluting control equivalence principle " new approaches, has illustrated the reasonableness of thickness compensation permeability coefficient.
Water and soil engineering journal, set forth in 1993, the 7 phases " research trial of the garbage sanitary filling field antiseepage lining composite earth " literary composition: " loess is a kind of special continent rickle in the quaternary period, and it is very wide to distribute all over the world, and character is special.China's loess class soil is distributed in northwest, North, Northeast China area basically, and area can reach more than 60 ten thousand square kilometres.Loess is by less than the granulometric composition of 0.25mm basically, especially with the particle of 0.1～0.01mm in the highest flight.Silt content often surpasses over half, even reaches 60%～70%, and wherein mainly is the coarse dust of 0.05～0.01mm; Sand grain content is less, generally seldom surpass 20%, even have only percentum, and wherein main be the fine sand of 0.1～0.05mm level; Clay content changes greatly, and from 5% to 35%, the most common is 15%～25%.”
Loess is based on powder quartzy and that feldspar is formed, the mineral wetting ability a little less than, fine size and homogeneous are though the not anti-water of binding has collapsibility; Without fine compacting, the short texture porous, macrovoid is obvious.So, loess has tangible chance water and links and weaken, structure is tending towards being inclined to closely.
In order to realize the localization of waste landfill yard lining impervious material in the loess area, solve the technical problem of modification loess as waste landfill yard lining, the applicant has established the problem of " research of modification loess lining ".Said modification loess, the loess of be meant admixture in loess wilkinite or lime or cement or coal dust ash.During problem is carried out, entrust Lanzhou University to do that a large amount of landfill yards is material modified selects test, mainly carried out the basic determination of physical appearance of loess, different material modified compaction tests and shearing experiment have been carried out, carried out the part physicochemical property analysis of wilkinite, lime, cement and coal dust ash, and hundreds of orthogonal tests of wilkinite, lime, cement, the coal powder fraction performance study after not making up with loess; Also carried out wilkinite; lime; cement; the X-diffraction mineral substance analytical test of coal dust ash and loess material; the penetrating quality test; the absorption property test; confined pressure is to the test of modification loess permeability coefficient influence; infiltration condition is to the test of modification loess permeability coefficient influence and the scanning electron microscope observation experiment to modification loess microstructure features; over thousands of test such as modification loess flexible wall permeability test; comparative study bentonite modified loess hit real performance and penetrating quality; before having observed infiltration; the microstructure features of post-modification loess; determined to satisfy the wilkinite volume of landfill site seepage prevention requirement; and probed into infiltration condition to the infiltrative influence of modification loess, finally drawn the claimed technical scheme of the present invention.
The present invention's explanation: if with k≤1.0 * 10
-7Cm/s, h=2m is as " standard " design variable of China's compacted soil liner, from polluting the angle of control, with different form combinations, all can reach the anti-seepage effect identical theoretically between soil property type, permeability coefficient, the liner thickness three with standard scheme.When liner permeability coefficient during greater than code requirement, can suitably increase liner thickness, utilize the characterization of adsorption of the soil body itself to pollutent, prolong the permeation pathway of pollutent in liner, pollutent is tackled and intercepted, to reach identical pollution control effect.Alternative lining should reach the pollution control effect identical with the standard lining, promptly meets so-called equivalence principle.The lining system is to the interception of pollutent, mainly be by waterpower intercept and lining material and landfill body transudate between physical-chemical effect obstruct, the physical-chemical effect is to the decay of pollutent, and is closely related with the type of the used soil material of lining etc.According to the equivalence principle, non-cohesive soil fully might be by increasing the deficiency that impervious barrier thickness compensates the impervious barrier permeability coefficient.
Be the experimental technique brief introduction of the present invention's a kind of landfill liner equivalent anti-infiltration material required for protection below:
This test is finished by mechanics institute of Lanzhou University, adopt HM-4160A type flexible wall permeameter produced in USA, with reference to ASTM D5084-03 standard " utilizing flexible wall permeameter to measure the standard test methods of saturated porous material ", under the varying head condition, measured and added that bentonitic loess is arranged is the permeability coefficient of modification loess material.Test is chosen distilled water as percolating fluid, chooses the maximum dry density of every kind of material and hits full pattern as infiltration sample, specimen finish Φ=102mm, high h=40mm.
Because the high precision characteristic of flexible wall permeameter makes specimen surface smooth when requiring cutting as far as possible, the upper and lower surfaces keeping parallelism is beneficial to sample and is close to permeable stone; During the dress sample flexible latex film is tightened and be attached to the sample perisporium, banding flexible membrane two closed levels up and down guarantee that peripheral water can not enter in the sample simultaneously; Install the gas of draining behind the sample in seepage flow pipe and the sample hole, in effusive water no longer small bubbles appear and till.
Test uses distilled water as hole liquid, according to ASTM (D5084-03) tentative specification, carries out falling head permeability test under 20 ℃ of room temperatures.In flow event, distilled water is entered by the sample bottom, flows out from the top, and each infiltration begins and finish all accurately to have write down calculating parameters such as pressure, head height and infiltration time spent.
According to Darcy's law, the permeability coefficient of modification loess can be calculated by formula (A) and try to achieve under the flexible wall permeameter varying head condition.
Because the cross-sectional area a of permeability testing machine buret
In=a
Out, ooze out the pressure p of pipe
OutBe normal atmosphere, the unit weight r of water
w=10.0kN/cm
3, following formula can be reduced to:
In the formula: k-permeability coefficient, cm/s;
a
In, a
Out-infiltration buret and the basal area of oozing out buret, cm
2
L
Sample-penetrating fluid is by the length of sample, cm;
A
Sample-sample cross is long-pending, cm
2
t
Initial, t
FinalThe initial sum termination time that head is read in-survey, s;
h
In, h
Out-infiltrate buret and ooze out the head of buret, cm;
p
In, P
Out-be added in infiltration head and ooze out gaseous tension on the head, kPa;
γ
wThe severe of-penetrating fluid under the test temperature condition, kN/m
3
The relation that two kinds of modification loess permeability coefficients of the present invention research change with the wilkinite adding rate as shown in Figure 1.As can be seen from Figure 1, the wilkinite adding rate was less than 4% o'clock, and curve reduces very slow, and the permeability coefficient of modification loess changes less, be in the same order of magnitude with true yellow soil, and numerical value is more or less the same.Continue to increase the wilkinite addition, curve tendency steepening then, the permeability coefficient of modification loess has obvious reduction: bentonitic adding rate reaches the permeability coefficient of 14% o'clock Lanzhou loess and reduces to 6.5 * 10
-8Cm/s, the permeability coefficient of Yulin loess reduces to 1.1 * 10
-8Cm/s can satisfy the antiseepage requirement of landfill yard lining.Result of study, also as can be seen the wilkinite adding rate the permeability coefficient of hour modification soil do not have considerable change, have only when bentonite content surpasses 8%, the permeability coefficient of modification soil just is significantly reduced.
Draw such conclusion from Fig. 1: loess can drop to k≤1.0 * 10 with the permeability coefficient of thickness h=3-2m loess behind the wilkinite that adds 8-14%
-7Below the cm/s, thereby reach the perviousness national regulation design requirements of refuse landfill compacted soil bed course.
The wilkinite that contrast Lanzhou loess and Yulin loess add different amounts respectively permeates in forward and backward 500 times of electron microscope photo scannings (Fig. 2 a to Fig. 5 b) obviously to be found out: the loess particle is mutual close tightr after adding wilkinite, clay mineral parcel loess particle and filling are between the particle hole, the porosity and the pore connectivity of modification loess are all obviously reduced, form the penetrating quality that has improved loess from microcosmic.The microstructure observations shows that also along with osmosis is carried out, the hole of modification loess can be further blocked.
Contrast modification loess permeates forward and backward 500 times of electron microscope photo scannings and can also find out: the degree of scatter of infiltration post-modification loess CLAY MINERALS AND THEIR SIGNIFICANCE is higher before than infiltration, further disperses and is filled in the hole of loess, and porosity is reduced to some extent.
Modification loess lining basic design parameters provided by the present invention, will possess skills in China loess area demonstration and promotional value provide guidance also can for desert, northwest, the landfill yard design of area, Gobi desert.Compare with the clay lining, modification loess lining will reduce disposes construction costs, is indicating huge economic benefit.
Though the present invention is to be research object with Yulin loess and Lanzhou, Gansu loess, other loess area waste landfill yard lining of China handled has important directive significance.
Description of drawings
Fig. 1 is the graph of a relation that Lanzhou modification loess and Yulin modification loess permeability coefficient change with the wilkinite adding rate;
Fig. 2 a Lanzhou loess adds 10% wilkinite and permeates preceding 500 times of electron microscope photo scannings,
Fig. 2 b Lanzhou loess adds 10% wilkinite and permeates back 500 times of electron microscope photo scannings,
Fig. 3 a Lanzhou loess adds 14% wilkinite and permeates preceding 500 times of electron microscope photo scannings,
Fig. 3 b Lanzhou loess adds 14% wilkinite and permeates back 500 times of electron microscope photo scannings,
Fig. 4 a Yulin loess adds 10% wilkinite and permeates preceding 500 times of electron microscope photo scannings,
Fig. 4 b Yulin loess adds 10% wilkinite and permeates back 500 times of electron microscope photo scannings,
Fig. 5 a Yulin loess adds 14% wilkinite and permeates preceding 500 times of electron microscope photo scannings,
Fig. 5 b Yulin loess adds 14% wilkinite and permeates back 500 times of electron microscope photo scannings.
Among the figure: LH-Lanzhou loess, YH-Yulin loess
Embodiment embodiment 1
With Lanzhou loess 86%, wilkinite 14% is taked existing method compacting lining material, 220 centimetres of liner thickness as lining material.
Embodiment 2
With Lanzhou loess 90%, wilkinite 10% is taked existing method compacting lining material, 300 centimetres of liner thickness as lining material.
Embodiment 3
With Lanzhou loess 88%, wilkinite 12% is taked existing method compacting lining material, 280 centimetres of liner thickness as lining material.
Embodiment 4
With Lanzhou loess 87%, wilkinite 13% is taked existing method compacting lining material, 250 centimetres of liner thickness as lining material.
With Yulin loess 88%, wilkinite 12% is taked existing method compacting lining material, 280 centimetres of liner thickness as lining material.
Embodiment 6
With Yulin loess 90%, wilkinite 10% is taked existing method compacting lining material, 300 centimetres of liner thickness as lining material.
Embodiment 7
With Yulin loess 86%, wilkinite 14% is taked existing method compacting lining material, 260 centimetres of liner thickness as lining material.
Claims (2)
1. a landfill liner equivalent anti-infiltration material is characterized in that being made up of following weight percentages; Lanzhou loess or Yulin loess 86～90%, wilkinite 10～14%.
2. a landfill liner equivalent anti-infiltration method is characterized in that with Lanzhou loess or Yulin loess 86～90%, and wilkinite 10～14% is as lining material, compacting lining material, 220～300 centimetres of liner thickness.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102296563A (en) * | 2011-05-26 | 2011-12-28 | 北京智泽山水生态环境技术有限公司 | Ecological permeability-reducing method and ecological permeability-reducing sand of sand channel |
| CN102330435A (en) * | 2011-07-05 | 2012-01-25 | 东南大学 | Separation wall for carrying out in situ separation repair on pollution site and construction method thereof |
| CN102966123A (en) * | 2012-11-29 | 2013-03-13 | 河海大学 | Double-layer clay liner for preventing seepage and resisting compression at bottom of refuse landfill |
| CN106836312A (en) * | 2017-03-15 | 2017-06-13 | 西北大学 | A kind of method of modifying for improving loess barrier performance |
| CN108226008A (en) * | 2018-01-18 | 2018-06-29 | 西安理工大学 | Self-loopa varying head darcy permeability test instrument |
| CN112552929A (en) * | 2021-02-19 | 2021-03-26 | 中铁四局集团有限公司北京分公司 | Muck improving material for earth pressure balance roof pipe in anhydrous sand layer |
| CN112779932A (en) * | 2020-12-08 | 2021-05-11 | 郑州航空工业管理学院 | Lining of solid waste landfill |
| CN113026821A (en) * | 2021-03-11 | 2021-06-25 | 太原理工大学 | Nano clay modified loess liner suitable for household garbage landfill |
| CN113149591A (en) * | 2021-03-11 | 2021-07-23 | 太原理工大学 | Modified loess and preparation method and application thereof |
| CN115288207A (en) * | 2022-07-06 | 2022-11-04 | 四川轻化工大学 | Anti-seepage adsorption lining for waste landfill in loess area and application thereof |
| CN115475598A (en) * | 2022-09-21 | 2022-12-16 | 浙江大学 | Preparation method and application of loess-modified bentonite vertical barrier wall material |
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2009
- 2009-11-14 CN CN200910117599A patent/CN101717614A/en active Pending
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102296563A (en) * | 2011-05-26 | 2011-12-28 | 北京智泽山水生态环境技术有限公司 | Ecological permeability-reducing method and ecological permeability-reducing sand of sand channel |
| CN102296563B (en) * | 2011-05-26 | 2013-12-18 | 北京智泽山水生态环境技术有限公司 | Ecological permeability-reducing method of sand channel |
| CN102330435A (en) * | 2011-07-05 | 2012-01-25 | 东南大学 | Separation wall for carrying out in situ separation repair on pollution site and construction method thereof |
| CN102966123A (en) * | 2012-11-29 | 2013-03-13 | 河海大学 | Double-layer clay liner for preventing seepage and resisting compression at bottom of refuse landfill |
| CN106836312A (en) * | 2017-03-15 | 2017-06-13 | 西北大学 | A kind of method of modifying for improving loess barrier performance |
| CN108226008B (en) * | 2018-01-18 | 2020-12-18 | 西安理工大学 | Self-circulation variable water head Darcy infiltration experimental instrument |
| CN108226008A (en) * | 2018-01-18 | 2018-06-29 | 西安理工大学 | Self-loopa varying head darcy permeability test instrument |
| CN112779932A (en) * | 2020-12-08 | 2021-05-11 | 郑州航空工业管理学院 | Lining of solid waste landfill |
| CN112552929A (en) * | 2021-02-19 | 2021-03-26 | 中铁四局集团有限公司北京分公司 | Muck improving material for earth pressure balance roof pipe in anhydrous sand layer |
| CN112552929B (en) * | 2021-02-19 | 2021-05-25 | 中铁四局集团有限公司北京分公司 | Muck improving material for earth pressure balance roof pipe in anhydrous sand layer |
| CN113026821A (en) * | 2021-03-11 | 2021-06-25 | 太原理工大学 | Nano clay modified loess liner suitable for household garbage landfill |
| CN113149591A (en) * | 2021-03-11 | 2021-07-23 | 太原理工大学 | Modified loess and preparation method and application thereof |
| CN115288207A (en) * | 2022-07-06 | 2022-11-04 | 四川轻化工大学 | Anti-seepage adsorption lining for waste landfill in loess area and application thereof |
| CN115475598A (en) * | 2022-09-21 | 2022-12-16 | 浙江大学 | Preparation method and application of loess-modified bentonite vertical barrier wall material |
| CN115475598B (en) * | 2022-09-21 | 2024-01-05 | 浙江大学 | Preparation method and application of loess-modified bentonite vertical barrier wall material |
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Application publication date: 20100602 |