CN101386486A - Geotechnical barrier material for treating pollutant-containing underground fluid - Google Patents
Geotechnical barrier material for treating pollutant-containing underground fluid Download PDFInfo
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- CN101386486A CN101386486A CNA2008101559050A CN200810155905A CN101386486A CN 101386486 A CN101386486 A CN 101386486A CN A2008101559050 A CNA2008101559050 A CN A2008101559050A CN 200810155905 A CN200810155905 A CN 200810155905A CN 101386486 A CN101386486 A CN 101386486A
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- barrier material
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- geotechnical barrier
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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Abstract
The invention discloses a geotechnical barrier material for treating pollutant-containing underground fluids. The geotechnical barrier material is prepared by uniformly mixing waste casting sand, fly ash, bentone and water according to a certain ratio. The geotechnical barrier material can improve the efficacy of geotechnical barriers in treating the pollutants contained in underground fluids and can reuse the waste casting sand and fly ash which cause environment pollution as geotechnical materials that can be used in projects. As a green environment-friendly material, the use of geotechnical barrier material is in accordance with the requirements for environment protection and sustainable development. The invention also relates to a method for making the geotechnical barrier material which is used to treat polluted fluids and a method for treating the underground polluted fluids with the geotechnical barrier material. The raw materials used by the method are industrial secondary waste materials which are widely available and cheap, so the method has obvious economic advantages over clay geotechnical barrier material.
Description
Technical field
The invention belongs to environment protection material technology field, be specifically related to a kind of be used to the handle last worker's barrier material of the underground fluid that contains pollutent and the manufacture method of this geotechnical barrier material.
Background technology
The pollutent of contaminated site (source) can down be penetrated into the waterbearing stratum gradually and flow along with phreatic, forms underground fluid, moves to remote areas and forms large-scale pollution.The geotechnical barrier body is to construct in the migration path of underground fluid or the underground earthen structure on the following water level, the migration that is used for controlling and blocking the pollutent in the underground fluid.
According to geotechnical barrier material needs in practice, and consider economy, geotechnical barrier material should satisfy following requirement: 1) reasonable anti-permeability performance should be arranged, the permeability coefficient of geotechnical barrier body is not more than 1 * 10
-7Cm/s.The geotechnical barrier body is constructed on the migration path of underground fluid or following water level, especially the big zone of groundwater flow momentum, the geotechnical barrier that anti-permeability performance is good can reduce the flow of underground fluid infiltration geotechnical barrier, thus the migration of pollution substance in control and the minimizing underground fluid; 2) reasonable pollutent blockage effect should be arranged, particularly have certain activity, so that by the pollutent in the reaction removal underground fluid of displacement and absorption; 3) should have the characteristics of quick formation intensity and globality, help in time containing the migration of underground fluid or the construction in abominable place, and can shorten construction period greatly; 4) should have stronger erosion resistance, under the environment of one or more contaminant infiltration, can keep low-permeability and high pollution thing retardancy preferably; 5) geotechnical barrier material is answered wide material sources, and cost can not be too high, and under the prerequisite that reaches the pollutent retardance, the thickness that the geotechnical barrier body fills should be as far as possible little, to save material usage and construction working amount.
Existing geotechnical barrier material is mainly great soil group.Specifically can be divided three classes, a class is a clay, and a class is a clay matter mixture, and a class is a grout matter mixture.Wherein, clay and clay matter mixture are used more extensive, and technology is comparative maturity also, but mainly there are following problem in clay and clay matter mixture as geotechnical barrier material:
1) globality of clay barriers is relatively poor.After the compacting clay experienced repeatedly drying and watering cycle and freeze-thaw cycle, the cohesiveness of barrier material obviously reduced, and ftractureed easily, and perviousness improves, and caused the seepage flow of underground fluid to increase, and the migration of pollutent increases.
2) the clay barriers is ageing relatively poor.Behind the corrosive pollutent of compacting clay Long contact time, the absorption and the replacing power of barrier material obviously descend, and cause pollution substance to move easily.If increase the filling-up thickness of barriers, not only increase floor space, material usage and construction working amount, and be difficult to guarantee the globality of barriers.
3) clay barrier material source is limited.Though clay material is common natural materials, but the clay that meets the underground fluid Pollutant Treatment is not available anywhere, the clay that the many regional underground geotechnical barriers of China are adopted can't guarantee all to conform with national standard, also be difficult to reach the compactness of regulation, therefore permeability resistance is poor, is difficult to reach requirement.
The main drawback of mud matter mixture barrier material is: the clay content of material is few, and is relatively poor to the adsorptivity of pollutent, because slurries water content height, the bleeding phenomenon takes place, along with the loss of moisture in poor quality's control easily during construction, shrink greatly, form dry crack easily and lose water stop function.
Summary of the invention
The objective of the invention is to overcome above-mentioned shortcoming of the prior art, a kind of geotechnical barrier material that is used to handle the underground fluid that contains pollutent is proposed, make full use of useless casting sand, flyash and wilkinite natural characteristics, directly three kinds of materials are mixed and made into colloid in aqueous media, be used for producing, can use useless casting sand and flyash in a large number, accomplish the waste material utilization, reduced the pollution of useless casting sand and flyash to environment, save a large amount of clays, have with low costly, raw material sources are extensive, and permeability resistance, bulk strength and pollutent retardation capability are better than clay.
The object of the invention is achieved through the following technical solutions: a kind of geotechnical barrier material that is used to handle the underground fluid that contains pollutent is characterized in that it is formulated by following raw materials by weight percentage:
Useless casting sand 40%～70%, flyash 10%～30%, wilkinite 10%～15%, water 10%～20%.
Described geotechnical barrier material is characterized in that it is formulated by following raw materials by weight percentage:
Useless casting sand 50%, flyash 20%, wilkinite 10%, water 20%.
Described geotechnical barrier material is characterized in that it is formulated by following raw materials by weight percentage:
Useless casting sand 70%, flyash 10%, wilkinite 10%, water 10%.
Flyash among the present invention is by the requirement of C class III grade standard regulation in the national standard GB 1596-2005 " flyash that is used for cement and concrete ", fineness, water content there is not other requirement, require loss on ignition less than 15%, sulfur trioxide content is less than 3%, useless casting sand is the foundary industry solid waste, particle diameter need be less than 1.0mm, and wilkinite is with the used wilkinite of common landfill pad layer.Water is selected the clean water that does not contain harmful impurity for use, and general tap water gets final product.
Mechanism of the present invention: useless casting sand in the material of the present invention and flyash are two kinds of low permeability and adsorptivities of not only having clay, and contain the geotechnical barrier material of certain active substance.Useless casting sand particle is tiny, and average 90% size distribution is in the 0.15-0.8mm grating.The permeability coefficient that useless casting sand hits after close can reach 10
-7The cm/s order of magnitude satisfies the low-permeability requirement of barrier material.Useless casting sand contains abundant active substance, especially Zero-valent Iron, viscous mineral matter and organic carbon, adsorbable or ion-exchange vinylchlorid compound, toxic heavy metal and muriate sterilant, effectively degradable organic pollutant.Fly ash grain is not only tiny, and level fits over 0.075-0.5mm, and specific surface area is big, helps adsorption, and has good hydraulic gelling property, under aqueous media, and the active silica (SiO on fly ash grain surface
2) and calcium hydroxide (Ca (OH)
2) and vitriol generation hydration reaction generation hydrated calcium silicate (C-S-H) gel, granule medium gluing on every side forms certain intensity, increases the globality and the erosion resistance of material, reaches the purpose that curing and stabilizing heavy metal move.Wilkinite in the material of the present invention is a kind of clay of 1:2 crystalline network, particle is less than 0.075mm, has high water-swelling, the wilkinite of small particle size can be filled in the particle hole of useless casting sand and coal ash mixed material, increase the degree of compactness and the perviousness that reduces mixture of mixture, in aqueous media, the wilkinite suction expands, further increase the degree of compactness and the perviousness that reduces mixture of mixture, this obviously also will promote the blockage effect of pollutent.
A kind of making and using method that is used to handle the geotechnical barrier material of the underground fluid that contains pollutent: will just can be used as the geotechnological material of underground barriers after the above-mentioned starting material mixing and stirring.
The present invention can use when practical application and traditional build, pumping, grouting and mortar jetting method construction, and these forms of construction work all need not to carry out compacting, and required main equipment is less, can save cost by a relatively large margin.When the present invention was used under the fill-up ground barriers, permeability resistance, intensity globality and erosion resistance were better than clay barriers, clay matter barriers and grout matter barriers, can reach the purpose of the pollutants transfer of retardance underground fluid.
After the present invention adopts technique scheme, mainly contain following advantage and effect:
(1) adopting useless casting sand and flyash is the main raw material prescription, in the making of underground fluid barrier material, has avoided a large amount of clays that use to be raw material, has saved land resources, turns waste into wealth the protection environment.
(2) main raw used in the present invention is useless casting sand and flyash, and material source is extensive, cheap material, and therefore actual operation cost is also lower, easy to utilize.
(3) this material is a self-compaction material, need not mechanical ramming after filling, the characteristics that self-packing arranged and fill and lead up, use clay as barrier material relatively, reduce the usage quantity of main equipment, simplified construction operation, improved construction safety, improve the homogeneity and the intensity of filling barrier, saved great amount of cost.
(4) this material is the self-hardening property material, compares as barrier material with using clay, fills back intensity, globality and permeability resistance and is improved, and helps to block the pollutent of underground fluid.
(5) this material erosion resistance is good, compares as barrier material with using clay, and it is whole to fill the glued one-tenth of back material granule, and antipollution thing corrosive performance is improved, and Use Limitation also strengthens.
(6) this material retardance pollutent is effective, and useless casting sand and flyash contain active substance, can promote absorption, displacement and the degraded of pollutent, improve the retardance of the pollutent of underground fluid.
(7) behind a certain amount of wilkinite of admixture of the present invention, volume slightly expands, and not only can avoid occurring shrinkage crack, and volumetric expansion helps the degree of compactness of material, can further improve permeability resistance and globality.
(8) geotechnological material of the present invention can be widely used as geotechnical barrier material as water conservancy curtain (Fig. 1), the material of sanitary filling field laying (Fig. 2).
Description of drawings
Fig. 1: geotechnical barrier material is as the synoptic diagram of water conservancy curtain.
Description of drawings: 1-source of pollution, 2-ground water table, 3-underground fluid, 4-water conservancy curtain, the weak permeable ground of 5-.
Fig. 2: geotechnical barrier material is as the synoptic diagram of sanitary filling field laying.
Description of drawings: 2-ground water table, 6-landfill material, 7-laying, the former soil layer of 8-.
Fig. 1 is that explanation the present invention can be used for underground water conservancy curtain, and the pollutants transfer that can block contaminated site can prevent that also cleaning seepage action of ground water goes into contaminated site simultaneously to other zone, and protection underground water is not contaminated.
Fig. 2 is that explanation the present invention can be used for the sanitary filling field laying, not only can reduce the amount of leaching of percolate, can also strengthen the blockage effect of laying to pollutent, and protection underground water is not contaminated.
Embodiment
Be described further the present invention below in conjunction with embodiment.
Embodiment among the present invention adopts conventional manufacture method.
Embodiment 1
A kind of component of the geotechnical barrier material that is used to handle the underground fluid that contains pollutent and cooperate the mass percent of ratio as follows:
Useless casting sand 50%
Flyash 20%
Wilkinite 10%
Water 20%
According to the geotechnical barrier material that this proportioning is made, permeability coefficient is 10 after tested
-8The cm/s order of magnitude, unconfined compression strength can reach 65kPa in 7 days, and permeability resistance reaches the regulation technical requirements, and the general clay of strength ratio (15-30kPa) height has intensity and globality preferably.
Embodiment 2
A kind of component of the geotechnical barrier material that is used to handle the underground fluid that contains pollutent and cooperate the mass percent of ratio as follows:
Useless casting sand 70%
Flyash 10%
Wilkinite 10%
Water 10%
According to the geotechnical barrier material that this proportioning is made, permeability coefficient is 10 after tested
-8The cm/s order of magnitude, unconfined compression strength can reach 50kPa in 7 days, and permeability resistance reaches the regulation technical requirements, and the general clay of strength ratio (15-30kPa) height has intensity and globality preferably.
Claims (4)
1. geotechnical barrier material that is used to handle the underground fluid that contains pollutent is characterized in that it is formulated by following raw materials by weight percentage:
Useless casting sand 40%～70%, flyash 10%～30%, wilkinite 10%～15%, water 10%～20%.
2. geotechnical barrier material according to claim 1 is characterized in that it is formulated by following raw materials by weight percentage:
Useless casting sand 50%, flyash 20%, wilkinite 10%, water 20%.
3. geotechnical barrier material according to claim 1 is characterized in that it is formulated by following raw materials by weight percentage:
Useless casting sand 70%, flyash 10%, wilkinite 10%, water 10%.
4. geotechnical barrier material according to claim 1 contains application in the underground fluid of pollutent in processing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101559050A CN101386486A (en) | 2008-10-10 | 2008-10-10 | Geotechnical barrier material for treating pollutant-containing underground fluid |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101559050A CN101386486A (en) | 2008-10-10 | 2008-10-10 | Geotechnical barrier material for treating pollutant-containing underground fluid |
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|---|---|
| CN101386486A true CN101386486A (en) | 2009-03-18 |
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| CNA2008101559050A Pending CN101386486A (en) | 2008-10-10 | 2008-10-10 | Geotechnical barrier material for treating pollutant-containing underground fluid |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103174173A (en) * | 2013-03-08 | 2013-06-26 | 浙江大学 | Method for shallow part enhancement type soil-swell soil vertical antifouling separating wall |
| CN107503383A (en) * | 2017-10-17 | 2017-12-22 | 中国科学院武汉岩土力学研究所 | A kind of Multi-layered composite gasket system antifouling for refuse landfill base impervious |
-
2008
- 2008-10-10 CN CNA2008101559050A patent/CN101386486A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103174173A (en) * | 2013-03-08 | 2013-06-26 | 浙江大学 | Method for shallow part enhancement type soil-swell soil vertical antifouling separating wall |
| CN103174173B (en) * | 2013-03-08 | 2015-03-11 | 浙江大学 | Method for shallow part enhancement type soil-swell soil vertical antifouling separating wall |
| CN107503383A (en) * | 2017-10-17 | 2017-12-22 | 中国科学院武汉岩土力学研究所 | A kind of Multi-layered composite gasket system antifouling for refuse landfill base impervious |
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Open date: 20090318 |