CN107274951B - Buffering backfill layer and its design method with negative charge density gradient - Google Patents
Buffering backfill layer and its design method with negative charge density gradient Download PDFInfo
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- CN107274951B CN107274951B CN201710464870.8A CN201710464870A CN107274951B CN 107274951 B CN107274951 B CN 107274951B CN 201710464870 A CN201710464870 A CN 201710464870A CN 107274951 B CN107274951 B CN 107274951B
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
- G21F9/00—Treating radioactively contaminated material; Decontamination arrangements therefor
- G21F9/28—Treating solids
- G21F9/30—Processing
- G21F9/301—Processing by fixation in stable solid media
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
- G21F9/00—Treating radioactively contaminated material; Decontamination arrangements therefor
- G21F9/04—Treating liquids
- G21F9/06—Processing
- G21F9/16—Processing by fixation in stable solid media
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Abstract
The present invention relates to buffering backfill layer and its design method with negative charge density gradient, the material which backfills layer is the polymer modification bentonite made of intercalation after sodium bentonite and sodium cellulose glycolate mixing；Buffering backfill layer is set as torus；The inner hole of torus places high-level waste tank for wrapping up；Buffering backfill layer is made by the polymer modification bentonite bed intussusception of several layers annular shape；The sodium cellulose glycolate of every one layer of polymeric modified alta-mud layer and the mass ratio of sodium bentonite are gradually increased along the radial direction of buffering backfill layer；The sodium cellulose glycolate of all polymer modification bentonite beds and the mass ratio of sodium bentonite are 1%~30%.Buffering backfill layer effectively improves bentonite chemical stability, improve the ability of salt tolerant, acidproof, resistance to heavy metal ion pollution, it remains to maintain extremely low infiltration coefficient under extremely pollution Leachate site effect, extends the Acceptable life of buffering backfill layer, it is ensured that disposition library safe operation.
Description
Technical field
The present invention relates to Environmental Geotechnical technical fields, in particular to negative charge density gradient buffering backfill layer and its
Design method.
Background technique
With the continuous development of nuclear industry, a large amount of high-level radioactive waste (abbreviation high-level waste) is produced, and such as
What long-term safety effectively disposes the problem of these high-level wastes are as whole world urgent need to resolve.By years of researches and reality
It tramples, current generally accepted feasible program is deep geological disposal, i.e., high-level waste is embedded in apart from the deep about 500-1000m's of earth's surface
In geologic body, it is allowed to permanently be isolated with the living environment of the mankind.Wherein buffering backfilling material is to be filled in waste body and disposition library
Engineering Barrier Materials between country rock play the waterpower barrier of Groundwater infiltration in barrier country rock, block the chemistry of nuclein migration
The key effects such as barrier and diffusion kernel radiant heat.Since compacting bentonite has high dilatancy, extremely low permeability, core
The features such as hysteresis of element migration, becomes the preferred buffering backfilling material used both at home and abroad.
During the operation of Nuclear Waste Repository, bentonite is made by long-term diffusion kernel photothermy and chemistry
With.Under temperature, the concentration of chemical solution and barometric gradient collective effect, the underground water in country rock can gradually be seeped into bentonite
Enter.Backfilling material is buffered for the bentonite of high-pressure solid, pore water is in adsorbed state.In this state, although moisture moves
Move simultaneously be under pressure gradient and temperature gradient driving, but barometric gradient drive under water translocation and diffusion process extremely
Slowly, occur sometimes even without flow phenomenon, and the water translocation under temperature gradient driving often becomes in hypotonic material
The main mechanism of Water Transport.Meanwhile bentonite, because of its special structure, soil particle surface has remaining negative electrical charge, because of its band
Electrically, soil particle has suction-operated to pore water or ion, while dissipation electric double-layer is generated around soil particle.Work as hole
When ion concentration in aqueous solution is higher, electric double layer compression, the permeability of material be increased dramatically, and influence disposition library safe operation
A key factor be ground water movement and the nuclein migration problem with ground water movement.Therefore how in above-mentioned extreme condition
Under effect, being still able to maintain the buffering backfill extremely strong barrier performance of layer is the critical issue to be solved.
Buffering backfill layer in the prior art is when the ion concentration of hole aqueous solution is higher, electric double layer compression, material
Permeability increased dramatically, and influence disposition library safe operation.
Summary of the invention
The present invention provides buffering backfill layers and its design method with negative charge density gradient, solve or part solves
Buffering backfill layer in the prior art determined when the ion concentration of hole aqueous solution is higher, what the permeability of material increased dramatically
Technical problem realizes and effectively improves bentonite chemical stability, improves the ability of salt tolerant, acidproof, resistance to heavy metal ion pollution,
It remains to maintain extremely low infiltration coefficient under extremely pollution Leachate site effect, extends the Acceptable life of buffering backfill layer, really
Protect the technical effect of disposition library safe operation.
A kind of buffering with negative charge density gradient provided by the invention backfills layer, and the material of the buffering backfill layer is
The polymer modification bentonite made of intercalation after sodium bentonite and sodium cellulose glycolate mixing；
The buffering backfill layer is set as torus；The inner hole of the torus places high-level waste tank for wrapping up；
The buffering backfill layer is made by the polymer modification bentonite bed intussusception of several layers annular shape；
The sodium cellulose glycolate of each layer polymer modification bentonite bed and the matter of the sodium bentonite
It measures than being gradually increased along the radial direction of the buffering backfill layer；
The sodium cellulose glycolate of all polymer modification bentonite beds and the quality of the sodium bentonite
Than being 1%~30%.
Preferably, the partial size of the sodium bentonite is less than or equal to 0.075mm.
Preferably, the thickness of each layer polymer modification bentonite bed is identical.
Preferably, the outer diameter of the buffering backfill layer and the difference of internal diameter are 1000mm.
Preferably, the buffering backfill layer is suppressed by 20 layers of polymer modification bentonite bed intussusception.
Preferably, the sodium cellulose glycolate and the sodium base of each layer polymer modification bentonite bed are swollen
The difference for moistening the mass ratio of soil is 1.5%；
The sodium cellulose glycolate of polymer modification bentonite bed described in innermost layer and the matter of the sodium bentonite
Amount is than being 1.5%.
Based on same inventive concept, present invention also provides a kind of, and the buffering with negative charge density gradient backfills layer
Design method, be used to prepare the buffering backfill layer with negative charge density gradient, described with negative charge density gradient
Buffering backfill layer design method include:
The sodium bentonite is added water and stirred into the mud containing 2 times of liquid limit water content；
The mud is divided into several pieces, the different hydroxylmethyl cellulose of mass ratio is added into every portion mud
Polymer modification bentonite described in stirring to obtain after plain sodium；Every bentonitic hydroxylmethyl cellulose of the portion polymer modification
The mass ratio of plain sodium and the sodium bentonite is 1%~30%；
By every portion polymer modification bentonite air-dry to water content be 4~5% after pulverize；
If the polymer modification bentonite after pulverizing is pressed into dry clay packet；
To be fixed on the corresponding several clay packets splicings of a polymer modification bentonite the height put it is useless
Outside the circumference of object tank, the circular polymer modification bentonite bed is formed；Every portion polymer modification bentonite pair
One layer of polymer modification bentonite bed should be formed；
The buffering backfill layer is formed after all polymer modification bentonite bed intussusceptions are fixed, and described in each layer
The sodium cellulose glycolate of polymer modification bentonite bed and the mass ratio of the sodium bentonite are backfilled along the buffering
The radial direction of layer is gradually increased.
Preferably, the partial size of the sodium bentonite is less than or equal to 0.075mm；
The clay packet is arranged to Rectangular Plate Structure, and the length of the clay packet is 25mm, width 15mm, with a thickness of
25mm；
The average dry density of the clay packet is 1.8g/cm3。
Preferably, the mud is divided into 20 parts, it is correspondingly formed 20 layers of polymer modification bentonite bed；
The sodium cellulose glycolate of polymer modification bentonite bed described in innermost layer and the matter of the sodium bentonite
Amount is than being 1.5%；
The sodium cellulose glycolate of polymer modification bentonite bed described in adjacent layer and the matter of the sodium bentonite
The difference for measuring ratio is 1.5%.
One or more technical solutions provided herein, have at least the following technical effects or advantages:
Sodium bentonite is added water and stirred into the mud containing 2 times of liquid limit water content due to using；It is added into mud
Stirring to obtain polymer modification bentonite after the sodium cellulose glycolate of setting quality, polymer modification bentonite are air-dried to aqueous
Amount pulverizes obtained clay packet after being 4~5%, and the splicing of clay packet is fixed on outside the circumference of high-level waste tank, annular shape is formed
Polymer modification bentonite bed forms buffering backfill layer after all polymer modification bentonite bed intussusceptions are fixed；Sodium bentonite
With sodium cellulose glycolate mix, polymer modification bentonite is made, so that bentonitic fixed negative charge density increases；It is each
The polymer modification bentonite bed of layer carries out mix using the sodium cellulose glycolate of different quality, obtains different fixation negative electricity
Lotus density, buffering backfill layer from inside to outside fixed negative charge content successively constant gradient increase, and buffer backfill layer temperature ladder
Degree successively decreases from inside to outside；Therefore seepage flow caused by energy compensation temperature gradient.In this way, efficiently solving in the prior art slow
Refunds packing course is when the ion concentration of hole aqueous solution is higher, the technical issues of permeability of material increased dramatically, has realized
Effect improves bentonite chemical stability, the ability of salt tolerant, acidproof, resistance to heavy metal ion pollution is improved, in extremely pollution Leachate site
It remains to maintain extremely low infiltration coefficient under effect, extends the Acceptable life of buffering backfill layer, it is ensured that disposition library safe operation
Technical effect.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the buffering backfill layer provided by the invention with negative charge density gradient；
Fig. 2 is the process signal of the design method of the buffering backfill layer provided by the invention with negative charge density gradient
Figure.
Specific embodiment
The embodiment of the present application provides the backfill layer and its design method of the buffering with negative charge density gradient, solve or
Part solves buffering backfill layer in the prior art when the ion concentration of hole aqueous solution is higher, and the permeability of material is sharply
The technical issues of increase, by the way that sodium bentonite is added water and stirred into the mud containing 2 times of liquid limit water content；It is added into mud
Stirring to obtain polymer modification bentonite after the sodium cellulose glycolate of setting quality, polymer modification bentonite are air-dried to aqueous
Amount pulverizes obtained clay packet after being 4~5%, and the splicing of clay packet is fixed on outside the circumference of high-level waste tank, annular shape is formed
Polymer modification bentonite bed forms buffering backfill layer after all polymer modification bentonite bed intussusceptions are fixed；It realizes effectively
Bentonite chemical stability is improved, the ability of salt tolerant, acidproof, resistance to heavy metal ion pollution is improved, makees in extremely pollution Leachate site
It remains to maintain extremely low infiltration coefficient under, extends the Acceptable life of buffering backfill layer, it is ensured that disposition library safe operation
Technical effect.
Referring to attached drawing 1, a kind of buffering backfill layer with negative charge density gradient provided by the invention, buffering backfill layer
Material is the polymer modification bentonite made of intercalation after sodium bentonite and sodium cellulose glycolate mixing；Buffering
Backfill layer is set as torus；The inner hole of torus places high-level waste tank for wrapping up；Buffering backfill layer passes through several layers circle
Cricoid polymer modification bentonite bed intussusception is made；The sodium cellulose glycolate and sodium of every one layer of polymeric modified alta-mud layer
The mass ratio of base bentonite is gradually increased along the radial direction of buffering backfill layer；The hydroxylmethyl cellulose of all polymer modification bentonite beds
The mass ratio of plain sodium and sodium bentonite is 1%~30%.
Wherein, sodium cellulose glycolate is a kind of anionically charged polymer, and swelling can be significantly increased by mixing in bentonite
The fixed negative charge density of soil remains to maintain biggish electric double layer thickness, reduces infiltration when the ion concentration of pore water increases
Property.Meanwhile the density gradient of negative electrical charge can be controlled by mixing the polymer of different quality in bentonite, it is sealed up for safekeeping to offset
Seepage flow caused by temperature gradient in the process.Intercalation occurs for sodium carboxymethylcellulose and bentonite simultaneously, is not easy to be washed by fluid
It is de-, so that polymer modification bentonite performance is more stable.Buffering backfill layer can effectively improve impermeability, and have relatively strong
Chemical stability and salt tolerant, acidproof, the pollution of resistance to heavy metal ion ability, remain to maintain under extremely pollution Leachate site effect
Extremely low infiltration coefficient substantially increases the barrier performance of buffering backfill layer.
Further, the partial size of sodium bentonite is less than or equal to 0.075mm.The thickness of every one layer of polymeric modified alta-mud layer
It spends identical.The outer diameter of buffering backfill layer and the difference of internal diameter are 1000mm.Buffering backfill layer passes through 20 one polymer bentones
Soil layer intussusception is suppressed, the sodium cellulose glycolate of every one layer of polymeric modified alta-mud layer and the matter of the sodium bentonite
The difference for measuring ratio is 1.5%；The sodium cellulose glycolate of innermost layer polymer modification bentonite bed and the quality of sodium bentonite
Than being 1.5%.
Based on same inventive concept, present invention also provides a kind of, and the buffering with negative charge density gradient backfills layer
Design method is used to prepare the above-mentioned buffering backfill layer with negative charge density gradient, and referring to attached drawing 2, this has negative electrical charge close
Degree gradient buffering backfill layer design method include:
S1: sodium bentonite is added water and stirred into the mud containing 2 times of liquid limit water content.
S2: being divided into several pieces for mud, stirs after the different sodium cellulose glycolate of mass ratio is added into every a mud
It mixes and obtains polymer modification bentonite；The matter of every portion polymer modification bentonitic sodium cellulose glycolate and sodium bentonite
Amount is than being 1%~30%.
S3: by every a polymer modification bentonite air-dry be 4~5% to water content after pulverize.
S4: if the polymer modification bentonite after pulverizing is pressed into dry clay packet.
S5: if the corresponding dry clay packet splicing of same portion polymer modification bentonite to be fixed on to the circumference of high-level waste tank
Outside, circular polymer modification bentonite bed is formed；Every portion polymer modification bentonite is correspondingly formed one layer of polymeric and changes
Property bentonite bed.
S6: forming buffering backfill layer after all polymer modification bentonite bed intussusceptions are fixed, every one layer of polymeric is modified
The sodium cellulose glycolate of bentonite bed and the mass ratio of sodium bentonite are gradually increased along the radial direction of buffering backfill layer.
Further, the partial size of sodium bentonite is less than or equal to 0.075mm；Clay packet is arranged to Rectangular Plate Structure, clay
The length of packet is 25mm, width 15mm, with a thickness of 25mm；The average dry density of clay packet is 1.8g/cm3。
Further, mud is divided into 20 parts, is correspondingly formed 20 one polymer bentone soil layers；Innermost layer polymer changes
Property bentonite bed sodium cellulose glycolate and sodium bentonite mass ratio be 1.5%；Adjacent layer polymer modification bentonite
The difference of the mass ratio of the sodium cellulose glycolate and sodium bentonite of layer is 1.5%.
The buffering backfill provided by the present application with negative charge density gradient is discussed in detail below by specific embodiment
The design principle and design procedure of layer:
The basic principle is:
The hole flow event of broad sense is described by following equations:
N in formulalFor the volume fraction of pore-fluid, vl,sSpeed for pore-fluid relative to solid skeletal, ξlFor infiltration
Coefficient,For the chemical potential of water in pore-fluid, ρlFor the density of pore-fluid, T is temperature, ηlFor unit quality hole clearance flow
Entropy possessed by body, b indicate gravitational effect, alFor the acceleration of pore-fluid.In formula in pore-fluid water chemical potentialIt can
It indicates are as follows:
In formulaFor reference state, (temperature T, pressure are) pure water chemical potential, plFor the true hole of pore-fluid
Pressure,For the density of reference state pure water, it is assumed that be constant.R is universal gas constant, is 8.314J/ (mol*K).MwIt is pure
The molal weight of water,For the activity of water in pore-fluid, when pore solution is ideal dilute solution, it will be assumed that be hole clearance flow
The concentration of water in body.ΩlFor the surface energy of pore-fluid.
In addition, there are following relationships for true pore pressure and measurement pore pressure:Wherein broad sense osmotic pressure Π includes
Two parts, i.e. Π=ΠD-ρlΩl；Donnan osmotic pressure isIn formulaFor balance solution hole
The activity of water in fluid, in balance solution ion concentration and fixed charge it is related.In conjunction with above-mentioned expression formula, then formula (1) is moved back
It turns to:
In fine and close bentonite, pressure gradient term (first item on the right of formula (3)) is compared to temperature gradient (formula (3) the right third
) and concentration gradient item (formula (3) on the right of Section 2) is smaller can be ignored.Simultaneously in balance solution pore-fluid water activity
Related with the density of fixed negative charge, above formula is writeable are as follows:
C in formulafixFor the fixed negative charge density of material, T is temperature.
By formula (4) it is found that in fine and close buffer layer backfilling material, the driving force of infiltration is mainly temperature and fixed charge
Concentration gradient.Therefore a kind of method can be used, so that above formula right end is smaller, zero is leveled off to, maintains buffering backfill layer extremely strong
Infiltration retardation capability.Preceding two coefficients are positive value in formula (4) right end bracket, it is therefore desirable to control the ladder of fixed negative charge
Degree will be with temperature gradient on the contrary, to seepage flow caused by compensation temperature gradient.And during disposing library operation, the temperature of buffer layer
Degree is to gradually decrease from inside to outside, it is therefore desirable to which the density for controlling fixed negative charge increases from inside to outside.
In conclusion can be adopted to guarantee that buffering backfill layer has extremely strong barrier performance under the effect of extreme Leachate site
The effective way taken is that certain electropolymer is added in buffering backfilling material, and it is close can to change bentonitic fixed negative charge
Degree, so that buffering backfill layer has certain negative charge density gradient, so that seepage flow caused by compensation temperature gradient, maintains its low
Permeability.
The design procedure are as follows:
S1: sodium bentonite is added water and stirred into the mud containing 2 times of liquid limit water content；The partial size of sodium bentonite is less than
Or it is equal to 0.075mm.
S2: being divided into 20 parts for mud, stirs after the different sodium cellulose glycolate of mass ratio is added into every a mud
Obtain polymer modification bentonite；The molecular weight of sodium cellulose glycolate is 263.1976.The smallest a polymer of mass ratio
The sodium cellulose glycolate of modified alta-mud and the mass ratio of sodium bentonite are 1.5%；Remaining polymer modification bentonite
Sodium cellulose glycolate and sodium bentonite mass ratio difference be 1.5%.
S3: by every a polymer modification bentonite air-dry be 4% to water content after pulverize.
S4: the polymer modification bentonite after pulverizing is pressed into clay packet of the muti-piece having a size of 25*25*15mm, and viscous
The average dry density of Tu Bao is 1.8g/cm3。
S5: if the corresponding dry clay packet splicing of same portion polymer modification bentonite to be fixed on to the circumference of high-level waste tank
Outside, circular polymer modification bentonite bed is formed；It is modified that 20 parts of polymer modification bentonites are correspondingly formed 20 one polymer
Bentonite bed.
S6: forming buffering backfill layer after all polymer modification bentonite bed intussusceptions are fixed, every one layer of polymeric is modified
The sodium cellulose glycolate of bentonite bed and the mass ratio of sodium bentonite are gradually increased along the radial direction of buffering backfill layer.
It is cylinder an actor's rendering of an operatic tune body that the buffering, which backfills layer, and with a thickness of 500mm, the setting of high-level waste tank backfills layer inner hole in buffering
In, sodium cellulose glycolate quality contained by every one polymer bentone soil layer is different, from inside to outside content successively constant gradient
Increase, therefore the density gradient of fixed negative charge is gradually increased from inside to outside, and buffers the temperature gradient of backfill layer from inside to outside
Successively decrease, seepage flow caused by the negative charge density gradient energy compensation temperature gradient of buffering backfill layer maintains its low-permeability.
The design method of buffering backfill layer substantially increases the barrier performance of buffering backfilling material, effectively improves bentonite
Chemical stability improves the ability of salt tolerant, acidproof, resistance to heavy metal ion pollution, remains to tie up under extremely pollution Leachate site effect
Extremely low infiltration coefficient is held, the Acceptable life of isolation facility is extended, meanwhile, the design method principle is intuitive, buffers back
The preparation of packing course material is simple easily operated, cheap；And mechanics with higher and chemical stability.
One or more technical solutions provided herein, have at least the following technical effects or advantages:
Sodium bentonite is added water and stirred into the mud containing 2 times of liquid limit water content due to using；It is added into mud
Stirring to obtain polymer modification bentonite after the sodium cellulose glycolate of setting quality, polymer modification bentonite are air-dried to aqueous
Amount pulverizes obtained clay packet after being 4~5%, and the splicing of clay packet is fixed on outside the circumference of high-level waste tank, annular shape is formed
Polymer modification bentonite bed forms buffering backfill layer after all polymer modification bentonite bed intussusceptions are fixed；Sodium bentonite
With sodium cellulose glycolate mix, polymer modification bentonite is made, so that bentonitic fixed negative charge density increases；It is each
The polymer modification bentonite bed of layer carries out mix using the sodium cellulose glycolate of different quality, obtains different fixation negative electricity
Lotus density, buffering backfill layer from inside to outside fixed negative charge content successively constant gradient increase, and buffer backfill layer temperature ladder
Degree successively decreases from inside to outside；Therefore seepage flow caused by energy compensation temperature gradient.In this way, efficiently solving in the prior art slow
Refunds packing course is when the ion concentration of hole aqueous solution is higher, the technical issues of permeability of material increased dramatically, has realized
Effect improves bentonite chemical stability, the ability of salt tolerant, acidproof, resistance to heavy metal ion pollution is improved, in extremely pollution Leachate site
It remains to maintain extremely low infiltration coefficient under effect, extends the Acceptable life of buffering backfill layer, it is ensured that disposition library safe operation
Technical effect.
Above-described specific embodiment has carried out further the purpose of the present invention, technical scheme and beneficial effects
It is described in detail, it should be understood that being not limited to this hair the foregoing is merely a specific embodiment of the invention
Bright, all within the spirits and principles of the present invention, any modification, equivalent substitution, improvement and etc. done should be included in the present invention
Protection scope within.
Claims (9)
1. a kind of buffering with negative charge density gradient backfills layer, which is characterized in that
It is described buffering backfill layer material be sodium bentonite and sodium cellulose glycolate mixing after made of intercalation
Polymer modification bentonite；
The buffering backfill layer is set as torus；The inner hole of the torus places high-level waste tank for wrapping up；
The buffering backfill layer is made by the polymer modification bentonite bed intussusception of several layers annular shape；
The sodium cellulose glycolate of each layer polymer modification bentonite bed and the mass ratio of the sodium bentonite
Radial direction along the buffering backfill layer is gradually increased；
The mass ratio of the sodium cellulose glycolate and the sodium bentonite of all polymer modification bentonite beds is
1.5%.
2. the buffering with negative charge density gradient backfills layer as described in claim 1, which is characterized in that
The partial size of the sodium bentonite is less than or equal to 0.075mm.
3. the buffering with negative charge density gradient backfills layer as described in claim 1, which is characterized in that
The thickness of each layer polymer modification bentonite bed is identical.
4. the buffering with negative charge density gradient backfills layer as claimed in claim 3, which is characterized in that
The outer diameter of the buffering backfill layer and the difference of internal diameter are 1000mm.
5. the buffering with negative charge density gradient backfills layer as described in claim 1, which is characterized in that
The buffering backfill layer is suppressed by 20 layers of polymer modification bentonite bed intussusception.
6. the buffering with negative charge density gradient backfills layer as claimed in claim 5, which is characterized in that
The sodium cellulose glycolate of each layer polymer modification bentonite bed and the mass ratio of the sodium bentonite
Difference be 1.5%；
The sodium cellulose glycolate of polymer modification bentonite bed described in innermost layer and the mass ratio of the sodium bentonite
It is 1.5%.
7. a kind of design method of the buffering backfill layer with negative charge density gradient, is used to prepare any one of claim 1~6
The buffering with negative charge density gradient backfills layer, which is characterized in that the buffering with negative charge density gradient
Backfill layer design method include:
The sodium bentonite is added water and stirred into the mud containing 2 times of liquid limit water content；
The mud is divided into several pieces, the different sodium cellulose glycolate of mass ratio is added into every portion mud
Polymer modification bentonite described in stirring to obtain afterwards；Every bentonitic sodium cellulose glycolate of the portion polymer modification
Mass ratio with the sodium bentonite is 1.5%；
By every portion polymer modification bentonite air-dry to water content be 4~5% after pulverize；
If the polymer modification bentonite after pulverizing is pressed into dry clay packet；
Corresponding several clay packets splicings the high-level waste tank will be fixed on the portion polymer modification bentonite
Circumference outside, form the circular polymer modification bentonite bed；Every portion polymer modification bentonite corresponds to shape
At one layer of polymer modification bentonite bed；
The buffering backfill layer, and the polymerization of each layer are formed after all polymer modification bentonite bed intussusceptions are fixed
The sodium cellulose glycolate of object bentone soil layer and the mass ratio of the sodium bentonite are along the buffering backfill layer
Radial direction is gradually increased.
8. the design method of the buffering backfill layer with negative charge density gradient as claimed in claim 7, which is characterized in that
The partial size of the sodium bentonite is less than or equal to 0.075mm；
The clay packet is arranged to Rectangular Plate Structure, and the length of the clay packet is 25mm, width 15mm, with a thickness of 25mm；
The average dry density of the clay packet is 1.8g/cm3。
9. the design method of the buffering backfill layer with negative charge density gradient as claimed in claim 7, which is characterized in that
The mud is divided into 20 parts, is correspondingly formed 20 layers of polymer modification bentonite bed；
The sodium cellulose glycolate of polymer modification bentonite bed described in innermost layer and the mass ratio of the sodium bentonite
It is 1.5%；
The sodium cellulose glycolate of polymer modification bentonite bed described in adjacent layer and the mass ratio of the sodium bentonite
Difference be 1.5%.
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| CN105622019A (en) * | 2015-12-31 | 2016-06-01 | 安吉县宇宏粘土化工有限公司 | Modified clay reinforcing paste slurry |
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