CN207775867U - A kind of vertical antifouling isolation wall construction of cement-bentonite - Google Patents

A kind of vertical antifouling isolation wall construction of cement-bentonite Download PDF

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CN207775867U
CN207775867U CN201721425787.1U CN201721425787U CN207775867U CN 207775867 U CN207775867 U CN 207775867U CN 201721425787 U CN201721425787 U CN 201721425787U CN 207775867 U CN207775867 U CN 207775867U
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bentonite
wall
cement
water
soil layer
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李育超
黄根清
杨佳林
于泽溪
陈冠年
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Zhejiang University ZJU
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Abstract

The utility model discloses a kind of vertical antifouling isolation wall constructions of cement bentonite.Including cement bentonite wall and its material mixture ratio, and it is arranged and leads wall in cement bentonite wall earth's surface position both sides, cement bentonite wall is extended through from earth's surface through high osmosis rock-soil layer in opposite impervious stratum, and stable upper water plane and downstream water plane are formed in high osmosis rock-soil layer;Cement bentonite wall and lead wall top face and around ground overlying structure.The utility model materials for wall has both the advantages that water content is high, permeability is low, non-deformability is strong, shearing strength is higher, and work surface is small, simplifies vertical antifouling partition wall construction technique;Divider wall is made and spreads prevention and control, the operating mode larger especially suitable for burden pressure or ground lateral pressure for the regulation and control of concentrated contaminated water source seepage action of ground water and pollutant.

Description

A kind of vertical antifouling isolation wall construction of cement-bentonite
Technical field
The utility model is related to seepage action of ground water regulation and control and the structures of underground water and soil environmental pollution prevention and control, and in particular to one Plant cement-bentonite vertically antifouling isolation wall construction.
Background technology
China's rapid economic development causes seriously descend water and soil pollution simultaneously.Municipal solid wastes the like waste is concentrated Disposal site (in particular, ten hundreds of below standard simple city solid waste landfill sites or stockyard) generally existing underground pollution is asked Topic, the place heavy metal and organic pollution content left after a large amount of industrial enterprise's resettlements are significantly exceeded.Vertical antifouling isolation Wall is the technical way for effectively controlling above-mentioned pollution sources pollution periphery underground environment.
Abound with that high-quality natural sodium bentonite is different, and the domestic natural montmorillonite overwhelming majority in China is that calcium base is swollen from the U.S. Profit soil.Compared with sodium bentonite, the stickiness that the bentonite of calcium-base bentonite mud is generally not easy needed for dispersion formation does not precipitate Suspension.Under the same conditions, the soil-bentonite prepared with calcium-base bentonite or modified calcium-base bentonite is in barrier properties, absorption Property etc. in multinomial major project characteristic not as good as soil-bentonite that natural sodium bentonite is prepared, it is difficult to reach underground pollution prevention and control Technology requirement.
The vertical antifouling partition wall construction process such as soil-bentonite, plastic concrete mainly by " excavate groove/mud off, Two key step compositions of backfill/displacement mud ", construction technology are relative complex.Meanwhile common soil-bentonite is vertically antifouling Divider wall materials for wall shearing strength is relatively low, it is difficult to bear larger burden pressure or ground lateral pressure, be also easy to produce larger change Shape influences the integrality and long service performance of vertical antifouling divider wall under above-mentioned operating mode.
Utility model content
The purpose of this utility model is that a kind of cement-bentonite vertically antifouling isolation wall construction is proposed, with cement, state Production calcium-base bentonite or modified calcium-base bentonite and water are that primary raw material is mixed and made into high-moisture, hypotonicity, resistance to deformation energy Power is strong, the higher vertical antifouling divider wall materials for wall of shearing strength, it is proposed that is suitable for larger burden pressure or ground is lateral The vertical antifouling isolation wall construction of cement-bentonite of pressure working condition, and common vertical antifouling partition wall construction technique is simplified, Increase the technological approaches of effective prevention and control China underground pollution.
The utility model is achieved through the following technical solutions:
The utility model include be placed in cement-bentonite wall of upper water plane and downstream water plane intersection, and Wall of leading in cement-bentonite wall earth's surface position both sides is set, and cement-bentonite wall is arranged in high osmosis rock-soil layer In, wall lower part is embedded in the opposite impervious stratum under high osmosis rock-soil layer, and cement-bentonite wall is from earth's surface through height Permeability rock-soil layer extends through in opposite impervious stratum, and stable upper water plane and downstream are formed in high osmosis rock-soil layer Water level face;Cement-bentonite wall and lead wall top face and around ground on be provided with overlying structure and (such as surface cap rock or enclose Dike etc.).
The high osmosis of the high osmosis rock-soil layer refers to that infiltration coefficient is more than 1 × 10-7cm/s。
The cement-bentonite materials for wall is the mixture of cement/bentonite/water, and part of cement can be by levigate grain Shape blast-furnace slag or coal ash instead, substitution rate are 40%~90% mass, wherein cement and levigate granular blast furnace slag or powder The quality sum of coal ash accounts for the 15%~30% of mixture gross mass;Bentonite slurry quality account for mixture gross mass 70%~ 85%, wherein bentonite quality accounts for the 5%~10% of bentonite slurry quality.
The cement-bentonite materials for wall is mixture, the levigate granular blast furnace slag/water of cement/bentonite/water The mixture of mud/bentonite/water or the mixture of flyash/cement/bentonite/water.
Specifically, in the mixture of the cement/bentonite/water, cement quality account for mixture gross mass 15%~ 30%;Bentonite accounts for the 70%~85% of mixture gross mass, wherein bentonite quality with bentonite slurry quality made of water Account for the 5%~10% of bentonite slurry quality.
Specifically, in the mixture of the levigate granular blast furnace slag/cement/bentonite/water, levigate granular blast furnace slag The 15%~30% of mixture gross mass is accounted for the quality sum of cement, wherein levigate granular blast furnace slag accounts for levigate granulated blast furnace The 40%~90% of the quality sum of clinker and cement;Bentonite accounts for mixture gross mass with bentonite slurry quality made of water 70%~85%, wherein bentonite quality accounts for the 5%~10% of bentonite slurry quality.
Specifically, in the mixture of the flyash/cement/bentonite/water, the quality sum of flyash and cement accounts for mixed The 15%~30% of object gross mass is closed, wherein flyash accounts for the 40%~90% of the quality sum of flyash and cement;Bentonite The 70%~85% of mixture gross mass is accounted for bentonite slurry quality made of water, wherein bentonite quality accounts for bentonite slurry The 5%~10% of quality.
The cement-bentonite materials for wall infiltration coefficient is not more than 1 × 10-6Cm/s, unconfined compressive strength are more than 50kPa and be less than 1MPa.
The overlying structure is clay, bentonite, bankets or the compound cover rocks containing GCL.
The cement-bentonite wall is to pour into cement-bentonite slurry through the direct shape of hydration and hardening after excavating groove At cement-bentonite slurry plays retaining wall in excavation groove stage injection groove.
The cement-bentonite thickness of wall body 0.3m~1.5m.
In the cement-opposite impermeable rock soil layer of bentonite wall insertion, and insert depth is not less than 1.0m.
The utility model have the advantage that for:
(1) it is main former that technical solutions of the utility model, which are with cement and domestic calcium-base bentonite or modified calcium-base bentonite, The vertical antifouling divider wall material of hypotonicity is made in material according to a certain ratio, solves short in the natural high-quality sodium bentonite in China Vertically antifouling divider wall materials for wall prepares problem to hypotonicity under the conditions of lacking.
(2) it is main former that technical solutions of the utility model, which are with cement and domestic calcium-base bentonite or modified calcium-base bentonite, Vertical antifouling divider wall material is made in material, with water content is high, non-deformability is strong, the higher engineering characteristic of shearing strength, solution Certainly wall leads to the problem of large deformation cracking or failure by shear under burden pressure or the larger operating mode of ground lateral pressure.
(3) technical solutions of the utility model are cement-bentonite slurries of channel excavation retaining wall through the direct shape of hydration and hardening At vertical antifouling divider wall materials for wall, as one-step method is constructed, than " excavating groove/mud off, backfill/displacement mud " two The vertical antifouling partition wall construction such as soil-bentonite, plastic concrete that footwork is constructed is simple, work surface is small, simplifies vertical anti- Dirty partition wall construction technique.
(4) vertically antifouling divider wall can be used for municipal solid wastes landfill yard, danger to the utility model cement-bentonite The seepage action of ground water regulation and control of the concentrated contaminated waters such as waste guaveyard, contaminated site source and pollutant spread prevention and control, especially suitable for overlying Pressure and the larger operating mode of ground lateral pressure.
Description of the drawings
Attached drawing 1 is the schematic cross-sectional view of the vertical antifouling isolation wall construction of the cement-bentonite of the utility model.
Attached drawing 2 is that vertically antifouling divider wall hydraulic grab machine key step of constructing is shown for the cement-bentonite of the utility model It is intended to:(a) the width groove reserved after width is excavated;(b) it excavates and reserves width groove;(c) it completes to excavate two width grooves.
In figure:1, cement-bentonite wall;2, high osmosis rock-soil layer;3, upper water plane;4, downstream water plane;5、 Opposite impermeable rock soil layer;6, overlying structure (such as surface cap rock or embankment);7, wall is led;8, hydraulic grab machine.
Attached drawing 3 is the experimental example 28 day age cement-bentonite infiltration coefficient of the utility model and levigate granulated blast furnace mine Slag substitutes the relationship of cement ratio.
Attached drawing 4 be the utility model experimental example 28 day age cement-bentonite unconfined compressive strength with it is levigate granular Blast-furnace cinder substitutes the relationship of cement ratio.
Specific implementation mode
Utility model is described in further detail with specific implementation mode with reference to neighbouring figure:
As shown in Figure 1, the vertical cement-that the utility model specific implementation is included in the setting of high osmosis rock-soil layer 2 is swollen Moisten cob wall body 1, which is embedded in the opposite impervious stratum 5 under it, and stable upstream water level is formed in high osmosis rock-soil layer 2 Face 3 and downstream water plane 4 further include being arranged to lead wall 7 in cement-bentonite wall earth's surface position both sides, and swollen in cement- Profit cob wall body 1 and lead the top surface of wall 7 and surrounding ground upper berth sets overlying structure 6.
Cement-bentonite wall 1 is the major part for realizing prevention and control underground pollution function, is arranged in high osmosis rock-soil layer 2, thickness 0.3m~1.5m, and the depth of embedded opposite impermeable rock soil layer 5 is not less than 1.0m, infiltration coefficient is not more than 1 × 10- 6Cm/s, non-confining strength one are more than 50kPa and are less than 1MPa.The material of cement-bentonite wall 1 be cement/bentonite/ The mixture of water, the mixture of levigate granular blast furnace slag/cement/bentonite/water or flyash/cement/bentonite/water it is mixed Object is closed, lignosulfonates is added in said mixture, mobility can be improved, delay setting time.Usually, cement and mill The quality sum of acinous blast-furnace slag or flyash accounts for the 15%~30% of mixture gross mass, and bentonite slurry quality accounts for mixed The 70%~85% of object gross mass is closed, dry bentonite quality accounts for the 5~10% of bentonite slurry quality.Wherein, part of cement can It is substituted by levigate granular blast furnace slag, levigate granular blast furnace slag can delay setting rate, mixed when substitution rate is 60%~80% Closing material infiltration coefficient can be than the mixture order of magnitude lower of no alternative materials;Part sofa can be by coal ash instead, fine coal Ash can increase mixture solid content, have good dry strength and resistance to chemical attack more better than levigate granular blast furnace slag Property.
The main function for leading wall 7 is that superficial part groove both sides foundation soil caves in and falls when preventing vertical antifouling divider wall channel excavation Enter groove, and guiding role during excavating groove.Cast-in-place concrete structure should be used by leading wall 7, and strength grade of concrete is not C20 should be less than, thickness is no less than 200mm, using two-way reinforcement, top surface 100mm preferably above ground level, and should be higher than that level of ground water 0.5m or more, 30mm~50mm should be widened than vertical antifouling divider wall design thickness by leading wall clear distance.
The main function of overlying structure 6 is to prevent vertical antifouling divider wall from suffering erosion, dehydration occurs crack and various Form interfere, located immediately at cement-bentonite wall 1 and lead on the top surface and surrounding ground of wall 7, material be mainly clay, Bentonite bankets or the compound cover rocks containing GCL.If overlying structure is surface cap rock, thickness 0.3m~0.6m.
The Specific construction process of the utility model is as follows:
(1) according to the vertical antifouling divider wall floor plan of cement-bentonite, smooth location, when necessary in construction machinery It is filling roadbed on route, foundation stability is improved, draws the horizontal centre of the vertical antifouling divider wall of cement-bentonite on the ground Axis.
(2) cement-bentonite slurry is prepared, high speed colloidal state shear mixer, rotating speed is preferably used to be preferably greater than 1400r/min, The aquation that progress 4h~8h is needed after mixing adds preferably abundant aquation bentonite before cement.
(3) vertical antifouling divider wall channel excavation, using mechanical works such as hydraulic grab machine, excavators.The groove of excavation Route should be not more than 0.6m with design axial line distance error, and guarantee is substantially vertical, and cutting depth is not answered with projected depth error More than 15cm.After channel excavation, using excavation project or other suitable clear bottoms of mode, the loose ground stone of channel bottom is removed Material.
When excavating groove, cement-bentonite slurry through aquation is injected in the trench, and be kept above groundwater level 60cm or more slot or occurs to the larger lateral deformation in groove direction to prevent groove both sides foundation soil unstability from collapsing.
Vertical antifouling divider wall groove is excavated using hydraulic grab machine 8, as shown in Fig. 2, being reserved on excavating direction of advance Region is not excavated less than hydraulic grab width, first excavates the latter width groove of reserved area, then excavates reserved area, and then complete At two width channel excavations.
When excavating groove process using end stop pipe or stop plate using discrete method, terminate in daily or each shift Before, backstop pipe or stop plate are inserted perpendicularly into completed slot section end, waiting cement-bentonite slurry initial set forms certain strong Backstop pipe or stop plate are extracted after degree, and a smooth vertical surface is formed in end.When excavating next slot section, digs into and be completed 60~90cm within the burnishing surface of slot section end, to new box cut section and be completed slot section formed continuity it is good vertically it is antifouling Divider wall wall.
(4) cement-bentonite slurry directly forms cement-bentonite wall 1 through hydration and hardening in groove, without such as soil- The common vertical antifouling divider wall type such as bentonite, plastic concrete backfills materials for wall step in the trench like that, to big It is big to reduce work surface.
(5) surface for removing Free water or cracking in groove at the top of wall after defined intensity has been reached, be used in combination newly Cement-bentonite slurry is supplemented to designed elevation.
The loose ground for backfilling thickness 15cm or more after the cement of supplement-bentonite slurry initial set at top, prevents top water Mud-bentonite wall dehydration cracking.Construction overlying structure (such as surface on cement-bentonite vertically antifouling divider wall top surface Cap rock or embankment etc.), prevent vertical antifouling divider wall from suffering erosion, dehydration and various forms of interference occurs.Surface cap rock Material uses clay or bentonite, thickness 0.3m~0.6m.
Experimental example 1
Cement-the bentonite of this experimental example is specifically to use C42.5 Portland cements (the limited public affairs of Hangzhou money tidewater mud Department's production), Shandong bentonite and levigate granular blast furnace slag (production of Yuan Heng water-purifying materials factory of Gongyi City) and tap water be formulated. Wherein, the quality sum of levigate granular blast furnace slag and cement is the 20% of cement-bentonite gross mass, levigate granulated blast furnace stove Slag amount is 0%, 40%, 70%, 80% and the 90% of the sum of levigate granular blast furnace slag and cement quality;Bentonite slurry matter Amount is the 80% of cement-bentonite gross mass, and bentonite quality is the 5% of bentonite slurry quality.Cement-swelling soil sample system After standby, after water-bath conserves 28 days under 20 ° of temperature conditions consolidate under 100kPa pressure, then it is 10 conditions to carry out hydraulic gradient Under infiltration coefficient test, the results are shown in Figure 3.As it can be seen that cement-bentonite infiltration coefficient is substituted with levigate granular blast furnace slag Cement proportion improves and declines.For this experimental example use cement-bentonite material, when levigate granular blast furnace slag quality not Less than cement and levigate granular blast furnace slag quality sum 40% when, cement-bentonite infiltration coefficient is less than 1 × 10-6Cm/s, Antiseepage requirement can be met.In addition, having carried out unconfined compressive strength test to the sample of maintenance 28 days, the results are shown in Figure 4.It can See, when levigate granular blast furnace slag quality 40% no more than cement and levigate granular blast furnace slag quality sum, cement-is swollen The native unconfined compressive strength of profit is more than 50kPa, can meet shearing strength requirement.
Above-mentioned specific implementation is used for illustrating the utility model with experimental example, and non-therefore limitation the utility model protects model It encloses, both is within the protection scope of the present invention according to various modifications made by above-mentioned specific implementation or apply mechanically.

Claims (4)

1. a kind of vertical antifouling isolation wall construction of cement-bentonite, it is characterised in that:Including be placed in upper water plane (3) and under Cement-bentonite the wall (1) of swimming plane (4) intersection and setting are in cement-bentonite wall (1) earth's surface position both sides Lead wall (7), cement-bentonite wall (1) is arranged in high osmosis rock-soil layer (2), cement-bentonite wall (1) lower part In opposite impervious stratum (5) under embedded high osmosis rock-soil layer (2), stabilization is formed in high osmosis rock-soil layer (2) Upper water plane (3) and downstream water plane (4);Cement-bentonite wall (1) and lead wall (7) top surface and around ground on It is provided with overlying structure (6).
2. a kind of vertical antifouling isolation wall construction of cement-bentonite according to claim 1, it is characterized in that:The water Mud-bentonite wall (1) material is the mixture of cement/bentonite/water.
3. a kind of vertical antifouling isolation wall construction of cement-bentonite according to claim 1, it is characterized in that:Described is upper Structure (6) is covered to be clay, bentonite, banket or the compound cover rocks containing GCL.
4. a kind of vertical antifouling isolation wall construction of cement-bentonite according to claim 1, it is characterized in that:Described leads The material of wall (7) is cast-in-place armored concrete.
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108951711A (en) * 2018-09-12 2018-12-07 中节能大地环境修复有限公司 A kind of hazardous waste pollution joint vertical divider structure and its construction method for Bed Rock Region
CN113461380A (en) * 2021-07-06 2021-10-01 中船第九设计研究院工程有限公司 Plastic concrete for vertical antifouling barrier
CN116770901A (en) * 2023-08-14 2023-09-19 水利部交通运输部国家能源局南京水利科学研究院 Double-layer vertical partition wall structure of polluted site and active regulation and control method

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108951711A (en) * 2018-09-12 2018-12-07 中节能大地环境修复有限公司 A kind of hazardous waste pollution joint vertical divider structure and its construction method for Bed Rock Region
CN113461380A (en) * 2021-07-06 2021-10-01 中船第九设计研究院工程有限公司 Plastic concrete for vertical antifouling barrier
CN113461380B (en) * 2021-07-06 2023-02-21 中船第九设计研究院工程有限公司 Plastic concrete for vertical antifouling barrier
CN116770901A (en) * 2023-08-14 2023-09-19 水利部交通运输部国家能源局南京水利科学研究院 Double-layer vertical partition wall structure of polluted site and active regulation and control method

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