CN109056764A - Compound impervious wall and its construction method for soft clay area landfill yard environmental protection - Google Patents
Compound impervious wall and its construction method for soft clay area landfill yard environmental protection Download PDFInfo
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- CN109056764A CN109056764A CN201811135797.0A CN201811135797A CN109056764A CN 109056764 A CN109056764 A CN 109056764A CN 201811135797 A CN201811135797 A CN 201811135797A CN 109056764 A CN109056764 A CN 109056764A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/12—Restraining of underground water by damming or interrupting the passage of underground water
- E02D19/18—Restraining of underground water by damming or interrupting the passage of underground water by making use of sealing aprons, e.g. diaphragms made from bituminous or clay material
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Abstract
The invention discloses a kind of compound impervious walls and its construction method for soft clay area landfill yard environmental protection; the compound impervious wall includes the flexible core wall around setting in landfill yard one week; the depth of the flexible core wall, which meets from earth's surface extension, is embedded in water barrier; plasticity wall is respectively arranged with inside and outside the flexible core wall; knee wall is respectively set on the outside of inside in internal plasticity wall and the plasticity wall in outside; it is provided with transition region between inboard knee wall and landfill yard, transition region is provided with underground water pump-drainage well.The present invention is according to certain process; building knee wall, right angle setting flexible core wall, makes plastic concrete according to specific proportion and underwater pouring mode is taken to construct plasticity wall vertical channel; pass through technical solution; it can be under the premise of ensureing landfill yard embankment, base fixed; it is effectively isolated dangerous waste landfill yard accident effusion, soil protection and underground water.
Description
Technical field
The present invention relates to a kind of compound impervious walls and its construction method for soft clay area landfill yard environmental protection.
Background technique
In the prior art, with the rapid development of social economy, urbanization and industrialization development are accelerated, municipal refuse,
Trade waste sharply increases, and the pressure that petrochemical industry, mine smelting process generate environment is increasing.Coastal weak soil
Area, due to factors such as Soft Clay defect, level of ground water height, the dangerous waste landfill yard of building, during operation, once leakage,
It is big to soil and groundwater harm, need to construct HDPE film vertical impermeable wall to reinforce environmental protection.Soft clay area is continuously vertical
Fluting will affect trough rim embankment, the soil body, generate displacement, and then phenomena such as ground cracking occur.
In addition, in the prior art, patent application CN102617073A discloses a kind of Plastic concrete for cutoff wall, packet
Cementitious material, aggregate, water-reducing agent and water are included, partial size, sand coarse aggregate ratio and the water-cement ratio etc. by adjusting aggregate realize flyash and moulding
Property concrete in high additive utilize.CN105236901A discloses a kind of for the plastic concrete of antiseep and its preparation side
Method, including cement, bentonite, flyash, gypsum, clay, fine aggregate, coarse aggregate, redispersable latex powder, sodium carbonate, propylene
Sour calcium, neopelex, sodium metasilicate and water, by using the group of ordinary portland cement and portland slag cement
It closes, the early strength and anti-permeability performance, addition redispersable latex powder for improving plastic concrete improve plastic concrete workability
The impermeability of concrete is further increased with intensity, addition calcium acrylate.
But the plastic concrete in the above technology meets the inorganic salts in sea water intrusion, especially seawater, will affect swelling
Native effect reduces plastic concrete intensity and barrier performance.
Summary of the invention
In view of this, the main purpose of the present invention is to provide a kind of for the compound of soft clay area landfill yard environmental protection
Cut-pff wall under the premise of ensureing landfill yard embankment, the soil body and leakage preventing structure safety, has according to the technical solution of the present invention
Command displacement is imitated, evades ground cracking, continuous underground compound impervious wall is constructed, to control in polluted soil or underground water
The diffusion mobility of pollutant, and by underground water pump-drainage well, effectively control groundwater level, and in time take out the effusion of interception
It administers out.
In order to achieve the above object, the technical scheme of the present invention is realized as follows:
A kind of compound impervious wall for soft clay area landfill yard environmental protection, the water proof including being embedded in landfill yard underground
Layer, including the flexible core wall around setting in landfill yard one week, the depth of the flexible core wall meet extend from earth's surface be embedded in every
Water layer is respectively arranged with plasticity wall inside and outside the flexible core wall, inside and place in internal plasticity wall
Knee wall is respectively set on the outside of external plasticity wall, is provided with transition between inboard knee wall and landfill yard
Area, transition region are provided with underground water pump-drainage well.
It is further preferred that the flexible core wall is made of the HDPE geomembrane of at least 3.0mm thickness, whole infiltration coefficient≤
10-8cm/s；Antiseepage coefficient≤5 × 10 of the plasticity wall-8Cm/s, thickness >=600mm, the knee wall is by surrounding one week
The multiple high-pressure rotary jet grouting piles being arranged are built-up, single pile diameter >=800mm, and 200mm, pile center's line and plasticity wall are engaged between stake
Sideline horizontal distance >=single pile radius+300mm.
It is further preferred that the depth of the knee wall and plasticity wall is identical as the depth of flexible core wall, the underground
Groundwater level is consistently lower than landfill yard base impervious layer 3m in the deep well pump control well of water pump-drainage well, while lower than described compound
Cut-pff wall periphery groundwater level is no less than 1m.
It is further preferred that the plasticity wall is in such a way that plastic concrete is by underwater grouting, in the flexibility
The two sides of core wall are symmetrically poured composition, and the plastic concrete is by cement, bentonite, clay, coarse sand, rice sand, melon seeds piece, poly-
Ionic surfactant, fluorocarbon surfactant, the polyether nonionic surfactant, non-ionic poly- third of oxyethylation
Acrylamide and water are constituted, and specific parts by weight are as follows:
Cement: 150-210 parts；
Bentonite: 40-80 parts；
Clay: 75-105 parts；
Middle sand: 398-513 parts；
Rice sand: 398-513 parts；
Melon seeds piece: 398-513 parts；
Polyoxyethylated ionic surfactant: 0.6-1 parts；
Fluorocarbon surfactant: 0.1-2 parts；
Polyether nonionic surfactant: 0.5-1.5 parts；
Non-ionic polyacrylamide: 0.0002-0.02 parts；
Water: 300-380 parts.
It is further preferred that the cement is portland cement；
The bentonite selects sodium bentonite, and granularity meets 400 mesh screen residues and is not more than 10%；
The clay selects silty clay, and moisture content is not more than 8%, and granularity meets 100 mesh screen residues and is not more than 10%；
The coarse sand selects river sand, partial size 0.5-3mm；
The rice sand, which is that mountain cobble is broken, to be formed, partial size 3-5mm；
The melon seeds piece, which is that mountain cobble is broken, to be formed, partial size 5-10mm；
The coarse sand: rice sand: the weight ratio of melon seeds piece is 1:1:1；
The polyoxyethylated ionic surfactant is ether alcohol sulfate；
The fluorocarbon surfactant selects polyethylene glycol Hydrophilic nonionic fluorocarbon surfactant；
The polyether nonionic surfactant is the addition product of the ethylene oxide of polypropylene glycol, wherein ethylene oxide number
Mesh is 40-50.
It is further preferred that the plastic concrete is prepared by following steps:
Step A: polyoxyethylated ionic surfactant and a certain proportion of water, a certain proportion of bentonite are mixed
It is even, it is then allowed to stand extruding, bentonite slurry is made；
Step B: non-ionic polyacrylamide and remaining water, fluorocarbon surfactant, polyether-type nonionic surface are lived
Property agent mix, adjusting liquid is made；
Step C: melon seeds piece, rice sand, coarse sand, clay, cement and remaining bentonite is descending one by one by partial size
Be mixed to form mixed dry material, then with the bentonite slurry, the adjusting liquid mix to get.
It is further preferred that water used in the step A is the 90% of total Water, water used with it is used swollen
Moistening native mass ratio is 100:10~15.
A kind of construction method of the compound impervious wall for soft clay area landfill yard environmental protection, specifically includes following
Step:
Step 1: being arranged the knee wall at two layers of interval around the periphery of landfill yard to underground, the depth of knee wall meet from
Earth's surface extension is embedded in water barrier；
Step 2: flexible core wall is set in two layers of the intermediate of knee wall, the depth satisfaction of the flexible core wall is prolonged from earth's surface
It stretches and is embedded in water barrier；
Step 3: plasticity wall is set between the inner peripheral and ectonexine knee wall of flexible core wall；
Step 4: underground water pump-drainage well is arranged in the transition region between internal layer knee wall and landfill yard.
It is further preferred that flexible core wall selects the HDPE geomembrane of 3.0mm thickness, single width width in the step 2
4.1m, several HDPE geomembranes are circumferentially arranged around landfill yard, and the two sides of adjacent HDPE geomembrane are welded to each other E type lock
Button completes the installation of HDPE geomembrane using Film opening roll cylinder vehicle and gravity lower film machine.
It is further preferred that plasticity wall is poured using plastic concrete in the step 3, and led using steel
Pipe bottom-up casting by the way of underwater pouring by the good plastic concrete of mixing surrounds circumferentially-spaced setting
A piece steel conduit, groove body bottom certain distance of the first steel conduit of depth direction on water barrier, every casting are specified deep
Degree, promotes a conduit, flushes until being poured into ground, the plastic concrete is by cement, bentonite, clay, coarse sand, rice
Sand, melon seeds piece, polyoxyethylated ionic surfactant, fluorocarbon surfactant, polyether nonionic surfactant,
Non-ionic polyacrylamide and water are constituted.
Compared with prior art, the invention has the following advantages:
Provided by the present invention for the compound impervious wall of soft clay area landfill yard environmental protection, flexible core wall is utilized
(HDPE geomembrane) and plasticity wall (excellent match plastic concrete casting) form vertical compound impervious wall main structure, control by
The diffusion mobility of contaminated soil or underground water pollutant improves the stability of Environmental Safety performance and structure.Knee wall is strong
The strength and stability for having changed landfill yard periphery weak soil improves the safety of construction.
A kind of compound impervious wall construction party for soft clay area hazardous waste landfill environmental protection provided by the invention
Method, plasticity wall are poured to be formed by plastic concrete, by that will do according to partial size is descending when plastic concrete prepares
Material is pre-mixed, and improves the uniformity of material, is conducive to the early strength for improving plastic concrete；By non-ionic polypropylene
Amide, fluorocarbon surfactant, polypropylene glycol the addition product of ethylene oxide be mixed into adjusting liquid, then it is mixed with the siccative that stirs evenly
It closes, improves cohesiveness and the resistance to inorganic salts inside plastic concrete；By the preparatory extruding of part bentonite at mud, and
Ether alcohol sulfate is added, forms the anti-inorganic salts mudcake of water proof on plastic concrete surface, is conducive to improve plastic concrete morning
Phase intensity and to inorganic salts resistance, provides one of safety and stability for flexible core wall (HDPE geomembrane) and assists potent impervious barrier.
A kind of compound impervious wall construction party for soft clay area hazardous waste landfill environmental protection provided by the invention
Method uses Film opening roll cylinder vehicle and gravity lower film machine to install HDPE geomembrane, the installation accuracy height of HDPE geomembrane, verticality
Height, construction efficiency is high, and low energy consumption, takes up little area, and can freely adjust the installation speed of HDPE geomembrane.
A kind of compound impervious wall construction party for soft clay area hazardous waste landfill environmental protection provided by the invention
Method can effectively control groundwater level by underground water pump-drainage well, while can in time extract the effusion of interception out and administer.
Detailed description of the invention
Fig. 1 is the schematic diagram of the section structure of compound impervious wall of the invention；
Fig. 2 is the cross section structure schematic diagram of compound impervious wall of the invention；
Fig. 3 is the right angle setting schematic diagram of HDPE geomembrane of the invention.
In figure, 1 flexible core wall, 2 plasticity walls, 3 knee walls, 4 water barriers, 5 landfill yards, 6 embankments, 7 soil bodys, 8 underground water
Pump-drainage well.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiments of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill people
Member's every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
Specific embodiment in the present invention is described in further detail below in conjunction with attached drawing.
As depicted in figs. 1 and 2, of the present invention for the compound anti-of soft clay area hazardous waste landfill environmental protection
Seep wall, including water barrier 4, flexible core wall 1, plasticity wall 2, knee wall 3 and underground water pump-drainage well 8.
The water barrier 4 is provided and is used usually as the base impervious layer of landfill yard 5, is embedded in underground, is in
Above water table, the corresponding subterranean zone of entire landfill yard 5 is at least expanded to, plays the role of obstructing water, both may be used
It is permeated and polluted underground water downwards with obstructing the water (effusion of such as landfill yard) being positioned above, while can also obstructed under it
Clean underground water on gush the landfill area for entering landfill yard 5.
The flexible core wall 1 is embedded into water barrier 4 from earth's surface extension, and around the setting of landfill yard 5 one weeks, and depth is from ground
Table, which extends always, to be embedded into underground water barrier 4, and anti-seepage effect is primarily served, and the pollutant for preventing operation from surprisingly revealing is in underground
It is spread to horizontal direction.
The plasticity wall 2 includes inside and outside two layers, is respectively inside and outside flexible core wall 1, depth is also embedded into
Water barrier 4, can with comparable intensity for protecting flexible core wall 1 from extraneous damage (such as burn into punctures)
Bear the static pressure of the soil body 7 without significantly deforming, damaged (such as crack, hole), meanwhile, plasticity wall 2 can also be
Certain anti-seepage effect is played to a certain extent.The thickness of the plasticity wall 2 of every side is generally 300mm.The flexible core wall 1
Arrange that sandwich layer (flexible core wall 1) is wrapped up by wrapping layer (plasticity wall 2) completely in sandwich layer, wrapping layer structure with plasticity wall 2,
This kind of combined wall prohibits the landfill area circle of landfill yard 5 in inside, forms a kind of combined wall with standalone feature, and
It is compound impervious wall of the invention main leakage preventing structure body in the horizontal direction, there is preferable anti-seepage effect.
In rough vertical direction, flexible core wall 1 and plasticity wall 2 extend from earth's surface and are embedded into water barrier 4, and point
It is not combined with water barrier 4 to be formed and be firmly combined and stable composite structure.Aforementioned combination can by with flowering structure come
Realize: water barrier 4 opens up slot or hole, and the end of the water barrier 4 for stretching to underground of flexible core wall 1 and plasticity wall 2 can
It is embedded into slot above-mentioned or hole.Obviously, in order to make the closed of the combination between flexible core wall 1, plasticity wall 2 and water barrier 4
Property, the seam between water barrier 4 and flexible core wall 1, plasticity wall 2 can be irrigated by various sealing materials, be filled up.
The knee wall 3 includes inside and outside two layers, is internal layer knee wall and outer layer knee wall, is located at inboard plasticity wall
The inside of body 2 and the outside of outside plasticity wall 2, it is built-up by high-pressure rotary jet grouting pile, thus to inside and outside flexible core
The two sides for the combined wall that wall 1 and plasticity wall 2 are constituted are supported, and are realized and reinforced to the 5 periphery soil body 7 of landfill yard,
Displacement is reduced, compound impervious wall construction safety is improved.In some improvement examples, positioned at inboard plasticity wall 2 and its inboard
Knee wall (i.e. internal layer knee wall) between and positioned at outside moulding wall 2 and its on the outside of 2 (i.e. outer layer of moulding wall
Knee wall) between can also be spaced by the soil body 7.
There is the transition region i.e. knee wall 3 of inboard between landfill yard 5 and the antiseepage area 3 of the formed innermost layer of the present invention and fill out
It buries and is provided with transition region between field 5, filled and formed by the soil body 7, transition region is provided with underground water pump-drainage well 8.Underground water pump drainage
Well 8 is used to control groundwater level, while can be used in time administer the effusion extraction of interception, to be effectively isolated
Dangerous waste landfill yard surprisingly leaks, soil protection and underground water.Its depth is generally closer to underground water barrier 4, but is in underground
On water barrier 4, groundwater level can be effectively controlled, while the effusion of interception can be extracted out in time and administered.
Compound impervious wall provided by the invention is sequentially arranged knee wall 3, plasticity wall for one week around landfill yard 5 from inside to outside
Body 2, flexible core wall 1, plasticity wall 2, knee wall 3, with 5 pollutant of the landfill yard diffusion for preventing operation from surprisingly revealing, the present invention
Underground water pump-drainage well 8 is also set up in transition region between the knee wall 3 and landfill yard 5 of inside, can effectively control underground water
Water level, while the effusion of interception can be extracted out in time and administered.The present invention is before ensureing 5 embankment of landfill yard, 6 base fixed
It puts, constructs compound impervious wall, be effectively isolated the unexpected leakage of dangerous waste landfill yard 5, soil protection and underground water.
Compound impervious wall is used for the environmental protection of soft clay area hazardous waste landfill, and is formed in the underground of landfill yard periphery
Building.In other words, the region of the practical landfill waste of landfill yard is greater than by the region of compound impervious wall limited.Compound impervious wall
It is primarily used to prohibit landfill yard circle inside it, so that pollutant entrained by rubbish to be limited to the place of entire landfill yard
Inside ground, without leaking and (referring mainly to horizontal direction, vertical direction).In the vertical direction, water barrier 4 play prevent effusion to
The problem of 7 percdation of the soil body.
As further embodiment, the flexible core wall 1 is made of the HDPE geomembrane for including at least 3.0mm thickness, whole
Body infiltration coefficient≤10-8cm/s.
As further embodiment, antiseepage coefficient≤5 × 10 of the plasticity wall 2-8Cm/s, 28 days without lateral confinement resistance to compression
Intensity >=4.5MPa, thickness >=600mm.
As further embodiment, the plasticity wall 2 is poured by plastic concrete.The plastic concrete by
Cement, bentonite, clay, coarse sand, rice sand, melon seeds piece, polyoxyethylated ionic surfactant, fluoro-carbon surface active
Agent, polyether nonionic surfactant, non-ionic polyacrylamide and water by a certain percentage, process mixing composition, adopt
The mode for taking underwater pouring is symmetrically poured composition in the two sides of flexible core wall 1.
As further embodiment, the knee wall 3 is built-up by high-pressure rotary jet grouting pile, single pile diameter >=800mm, stake
Between be engaged 200mm, stake is deep consistent with 2 height of plasticity wall, pile center's line and plasticity wall sideline horizontal distance >=single pile radius+
300mm, 28 days unconfined compressive strength >=1.5MPa of single pile, positioned at the two sides of plasticity wall 2.The particular number of stake is according to fluting
Stability Checking setting can form multiple rows of resistance to compression wall in every side if the compression strength of single knee wall is insufficient.The support
The setting of wall can reduce surrounding soil displacement, improve the construction safety of flexible core wall 1 and plasticity wall 2.
As further embodiment, the underground water pump-drainage well 8 is located at mistake between the knee wall 3 of inside and landfill 5
It crosses in area, is consistently lower than 5 base impervious layer of landfill yard using groundwater level in the deep well pump control well of underground water pump-drainage well 8
3m, while 1m is no less than lower than compound impervious wall periphery groundwater level.
As further embodiment, the plastic concrete of anti-inorganic salts used by the plasticity wall 2 is containing following weight
Measure the ingredient of number:
Cement: 150-210 parts, preferably 160~210 parts, further preferred 160~200 parts, most preferably 180~200 parts；
Bentonite: 40~80 parts, preferably 50~80 parts, further preferred 50~70 parts, most preferably 60~80 parts；
Clay: 75~105 parts, preferably 80~105 parts, further preferred 80~100 parts, most preferably 90~105 parts；
Coarse sand: 398~513 parts, preferably 450~513 parts, further preferred 450~490 parts, most preferably 450~480 parts；
Rice sand: 398~513 parts, preferably 450~513 parts, further preferred 450~490 parts, most preferably 450~480 parts；
Melon seeds piece: 398~513 parts, preferably 450~513 parts, further preferred 450~490 parts, most preferably 450~480
Part；
Polyoxyethylated ionic surfactant: 0.6~1 part, preferably 0.8~1 part；
Fluorocarbon surfactant: 0.1~2 part, preferably 0.5~2 part, further preferred 0.5~1.5 part；
Polyether nonionic surfactant: 0.5~1.5 part, preferably 1~1.5 part；
Non-ionic polyacrylamide: 0.0002~0.02 part, preferably 0.005~0.02 part, further preferred 0.005~
0.01 part；
Water: 300~380 parts.
The present invention improves the anti-of plastic concrete by changing composition and the addition compound surfactant of aggregate
Inorganic salts permeability, and utilize the synergistic effect improvement plastic concrete between aggregate, cementitious material and surfactant
Comprehensive performance makes it meet the performance requirement of impervious purposes.
Wherein, the coarse sand of gradient partial size, rice sand, melon seeds piece and clay, bentonite, cement, improve plastic concrete
Uniformity is conducive to improve plastic concrete early strength.
Polyoxyethylated ionic surfactant can effectively improve plastic concrete to the resistivity of inorganic salts,
Ensure intensity and infiltration coefficient.
Polyether nonionic surfactant improves plastic concrete to the resistance of chemical reagent, enhances stabilization
Property.
Polyethylene glycol Hydrophilic nonionic fluorocarbon surfactant is added in the present invention, is formed and is protected on plastic concrete surface layer
Layer, reduces plastic concrete to ionic adsorption, further improves the resistivity to inorganic salts.
Non-ionic polyacrylamide is added in the present invention, reduces influence of the underground water to plastic concrete, reinforce it is each at
Cohesiveness between point is conducive to improve plastic concrete early strength.
Although the above polymer plays respective leading role, it has been investigated that, if the one kind being only added thereto,
Two or three, without whole additions, or using other proportions, ideal anti-inorganic salts performance can not be obtained.
The 42.5 strength grade ordinary portland cement of cement selection label；
The bentonite selects sodium bentonite, and granularity meets 400 mesh screen residues and is not more than 10%；
The clay selects silty clay, and moisture content is not more than 8%, and granularity meets 100 mesh screen residues and is not more than 10%；
The coarse sand selects river sand, 0.5~3mm of partial size；
The rice sand, which is that mountain cobble is broken, to be formed, 3~5mm of partial size；
The melon seeds piece, which is that mountain cobble is broken, to be formed, 5~10mm of partial size；
The coarse sand: rice sand: the weight ratio of melon seeds piece is 1:1:1；
The polyoxyethylated ionic surfactant is ether alcohol sulfate, preferred fat alcohol polyoxyethylene ether sulfuric acid
Salt, preferably C12~C14 fatty alcohol polyoxyethylene ether sulfate；
The fluorocarbon surfactant selects polyethylene glycol Hydrophilic nonionic fluorocarbon surfactant, it is preferable that described
The molecular weight of polyethylene glycol in polyethylene glycol Hydrophilic nonionic fluorocarbon surfactant is 0.4k~2k, further preferably
Ground, the fluorine carbon in the polyethylene glycol Hydrophilic nonionic fluorocarbon surfactant are perfluor (2- methyl -3- oxa- hexyl) fluorine
Compound or perfluor -2,5- dimethyl -3,6- dioxy nonanoyl fluorine.
The polyether nonionic surfactant is the addition product of the ethylene oxide of polypropylene glycol, wherein ethylene oxide number
Mesh is 40-50, such as 42,44,45,47,49,50 etc..
The preparation method that any conventional can be used in plastic concrete provided by the present invention is made, such as simple mixing,
However it has been investigated that, addition opportunity of mixed sequence and water and surfactant, extruding soil adding manner etc. to modeling
The performance of property concrete has a significant impact, for this purpose, the present invention provides following preferably preparation methods:
Step A: polyoxyethylated ionic surfactant and part water, part bentonite are mixed, are then allowed to stand
Bentonite slurry is made in extruding；
Step B: non-ionic polyacrylamide and remaining water, fluorocarbon surfactant, polyether-type nonionic surface are lived
Property agent mix, adjusting liquid is made；
Step C: remaining raw material (melon seeds piece, rice sand, coarse sand, clay, cement and remaining bentonite) is mixed
Mixed dry material is formed, is then mixed with the bentonite slurry, the adjusting liquid.
Wherein, water used in two step of the step A and step B can adjust according to actual needs；Preferably, step A institute
Water is the 90% of total Water (quality), and water used and bentonite mass ratio used are 100:10~15, such as
100:11,100:12,100:13,100:14,100:15 etc..The time of the extruding preferably for 24 hours more than.
Preferably, the step B is further are as follows:
Non-ionic polyacrylamide is mixed in a heated condition with remaining water, fluorocarbon surface is then added after the cooling period
Activating agent and polyether nonionic surfactant mix, adjusting liquid are made；First polyacrylamide is dissolved in the water, it can be with
The formation for exciting Mesh nodes in gel is conducive to the molecule cohesiveness for improving plastic concrete.Wherein, the temperature of heating is preferred
It is 60~80 DEG C.
The step C is further are as follows: by melon seeds piece, rice sand, coarse sand, clay, cement and remaining bentonite according to partial size
Sequence from large to small, addition mixing, is made mixed dry material, then mixes it with the bentonite slurry, the adjusting liquid one by one
It is even；It is descending according to partial size, and siccative is pre-mixed, and improves the uniformity of material, is conducive to improve plastic concrete
Early strength.
In three steps, the mixing of every step needs to cooperate stirring.For example, can be in 3000r/min revolving speed in step A
Under, it is stirred 15min.In step B 10min can be stirred under 200r/min revolving speed.In step C, first siccative is mixed
It closes, mixed mode: gradually adding by partial size is descending, and melon seeds piece, rice sand, coarse sand, clay, cement, bentonite are mixed
It is every to add a kind of 5~10min of material stirring to together, mixed dry material is made.
In step A in the ionic surfactant of mixed polyoxyethylene and part water, part bentonite, Ke Yixian
Polyoxyethylated ionic surfactant is mixed with water, usually (20~40 DEG C) is mixed at normal temperature, then adds
Bentonite, in high-speed stirred.
The present invention provides a kind of construction method of compound impervious wall for soft clay area landfill yard environmental protection, specific to wrap
Include following steps:
Step 1: the knee wall 3 at two layers of interval is set around the periphery of landfill yard to underground, and wherein internal layer knee wall abuts
The setting of landfill yard periphery has spacing between outer layer knee wall and internal layer knee wall, the depth of knee wall, which meets from earth's surface, to be extended
It is embedded in water barrier 4；
Internal layer knee wall and outer layer knee wall pass through multiple high-pressure rotary jet grouting piles being continuously engaged respectively and were formed around one week, stake
Deep satisfaction is embedded in water barrier 4, multiple high-pressure rotary-sprays that two neighboring stake in continuous one week is engaged each other from earth's surface extension
Stake, to form the knee wall 3 being circumferentially arranged.
Step 2: in the middle position of two layers of knee wall 3 setting flexible core wall 1 spaced apart, the flexible core wall 1
Depth meet from earth's surface extension be embedded in water barrier 4；
The flexible core wall 1 selects the HDPE geomembrane of 3.0mm thickness, the single width width of HDPE geomembrane 9 when operation
Several HDPE geomembranes circumferentially are arranged around landfill yard 5 in 4.1m, and the two sides of adjacent HDPE geomembrane are welded to each other, preferably
Practical welding E type lock, lock are distributed in the tow sides of HDPE geomembrane side, and lock projections part is backwards to HDPE geotechnique
Film, smooth part are welded towards HDPE geomembrane.As shown in figure 3, HDPE geomembrane 9 is rolled up in advance in Film opening roll cylinder vehicle 10
On, being moved to certain slot section slot 11 that water barrier 4 has been held successfully, nearby (water barrier 4 is in advance according to the size of building compound impervious wall
Setting is completed in laying, and water barrier 4 needs to be previously formed required for corresponding HDPE geomembrane is laid around setting one week
Slot, geosynclinal concave be set to water barrier 4 in), adjustment 9 bottom end of HDPE geomembrane overhang slot section surface and as far as possible with slot segment length side
To parallel, it is fixed temporarily by the gravity module 12-1 and HDPE geomembrane bottom end of gravity lower film machine 12, utilizes balance weight 12-2
HDPE geomembrane is vertically mounted to designated depth using gravity module 12-1 by the stress of balancing gravity lower film machine 12, is specified deep
Degree, which is required to meet from earth's surface extension, is embedded into underground water barrier 4.It was supported in a like fashion around landfill yard 5 one weeks in ectonexine
One week HDPE geomembrane is arranged in the intermediate of wall 3, and adjacent HDPE geotechnique's film web passes through the lock connection of E type, adjacent lock middle cavity
It is inserted into a hermetic seal item.The flexible core wall 1 need to be arranged one week around landfill yard 5, and continuous whole, centre cannot be interrupted,
And processing (be such as perfused, fill up) is sealed between the bottom and water barrier 4 of flexible core wall 1 (i.e. HDPE geomembrane).The present invention
Middle to use Film opening roll cylinder vehicle and gravity lower film machine, HDPE geomembrane installation accuracy is high, verticality is high, and construction efficiency is high, low energy consumption,
It takes up little area, can freely adjust the installation speed of HDPE geomembrane.
Step 3: plasticity wall 2, the plasticity wall are set between the inner peripheral and ectonexine knee wall of flexible core wall 1
The depth of body 2 is identical as flexible core wall depth；
The plasticity wall 2 is poured using plastic concrete.The production process of the plastic concrete is according to above
Plastic concrete preparation method state preparation.After preparing equation, before implementing plastic concrete casting, need to place pushing off the slag
Locking notch pipe is accidentally splashed to other regions when preventing from being axially poured certain fragment position.Plastic concrete uses DN250 steel
Conduit processed is poured, and is poured the good plastic concrete of mixing is bottom-up by the way of underwater pouring, along Zhou Fang
A piece DN250 steel conduit is set to interval 2~3m length, DN250 steel conduit is apart from slot bottom when depth direction is poured for the first time
0.5m (and water barrier 4 needs to be previously formed the slot required for casting plasticity wall around setting one week), every casting 0.5m is left
Right depth promotes a conduit, flushes until being poured into ground, completes the casting of flexible core wall 1.Water barrier 4 and plasticity wall
Seam between body 2 can be irrigated by various sealing materials, be filled up.
Step 4: underground water pump-drainage well is set in the soil body of the transition region between the knee wall and landfill yard for being located inside
8.Groundwater level is consistently lower than landfill yard base impervious layer 3m in the deep well pump control well of the underground water pump-drainage well, while low
In the compound impervious wall periphery, groundwater level is no less than 1m.
Embodiment 1:
The ingredient of plastic concrete provided in this embodiment is as follows: in terms of every cube of plastic concrete, by 150kg cement
(42.5 ordinary portland cement), 40kg sodium bentonite (granularity meets 400 meshes below 10%), 75kg clay is (aqueous
Rate is 8% hereinafter, granularity meets 100 mesh screen residues below 10%), 513kg coarse sand (0.5~3mm), 513kg meters of sand (3~
5mm), 513kg melon seeds piece (5~10mm), 0.6kg ether alcohol sulfate (sodium sulfate of polyethenoxy ether of fatty alcohol), the poly- second two of 0.1kg
(wherein molecular weight polyethylene glycol 1.8k, fluorine carbon are perfluor (2- methyl -3- oxa- to alcohol Hydrophilic nonionic fluorocarbon surfactant
Hexyl) fluoride), the addition product (wherein Oxyranyle number is 45) of the ethylene oxide of 0.5kg polypropylene glycol, 0.0002kg
Non-ionic polyacrylamide, 300kg water.Plastic concrete is made according to preparation method of the present invention.
Embodiment 2
The ingredient of plastic concrete provided in this embodiment is as follows: in terms of every cube of plastic concrete, by 160kg cement
(42.5 ordinary portland cement), 50kg sodium base bentonite (model is with embodiment 1), 80kg clay (model is with embodiment 1),
487kg coarse sand (model is with embodiment 1), 487kg meters of sand (model is with embodiment 1), 487kg melon seeds piece (model is with embodiment 1),
0.7kg ether alcohol sulfate (model is with embodiment 1), (model is same for 0.4kg polyethylene glycol Hydrophilic nonionic fluorocarbon surfactant
Embodiment 1), the addition product (model is with embodiment 1) of the ethylene oxide of 0.7kg polypropylene glycol, the non-ionic polypropylene of 0.005kg
Amide, 320kg water.Plastic concrete is made according to preparation method of the present invention.
Embodiment 3
The ingredient of plastic concrete provided in this embodiment is as follows: in terms of every cube of plastic concrete, by 180kg cement
(42.5 ordinary portland cement), 60kg sodium base bentonite (model is with embodiment 1), 90kg clay (model is with embodiment 1),
465kg coarse sand (model is with embodiment 1), 465kg meters of sand (model is with embodiment 1), 465kg melon seeds piece (model is with embodiment 1),
0.8kg ether alcohol sulfate (model is with embodiment 1), (model is the same as real for 1kg polyethylene glycol Hydrophilic nonionic fluorocarbon surfactant
Apply example 1), the addition product (model is with embodiment 1) of the ethylene oxide of 1kg polypropylene glycol, 0.01kg non-ionic polyacrylamide,
330kg water.Plastic concrete is made according to preparation method of the present invention.
Embodiment 4
The ingredient of plastic concrete provided in this embodiment is as follows: in terms of every cube of plastic concrete, by 200kg cement
(42.5 ordinary portland cement), 72kg sodium base bentonite (model is with embodiment 1), 100kg clay (model is with embodiment 1),
424kg coarse sand (model is with embodiment 1), 424kg meters of sand (model is with embodiment 1), 424kg melon seeds piece (model is with embodiment 1),
0.9kg ether alcohol sulfate (model is with embodiment 1), (model is same for 1.8kg polyethylene glycol Hydrophilic nonionic fluorocarbon surfactant
Embodiment 1), the addition product (model is with embodiment 1) of the ethylene oxide of 1.3kg polypropylene glycol, the non-ionic polypropylene of 0.015kg
Amide, 360kg water.Plastic concrete is made according to preparation method of the present invention.
Embodiment 5
The ingredient of plastic concrete provided in this embodiment is as follows: in terms of every cube of plastic concrete, by 210kg cement
(42.5 ordinary portland cement), 80kg sodium base bentonite (model is with embodiment 1), 105kg clay (model is with embodiment 1),
398kg coarse sand (model is with embodiment 1), 398kg meters of sand (model is with embodiment 1), 398kg melon seeds piece (model is with embodiment 1),
1kg ether alcohol sulfate (model is with embodiment 1), (model is the same as implementation for 2kg polyethylene glycol Hydrophilic nonionic fluorocarbon surfactant
Example 1), the addition product (model is with embodiment 1) of the ethylene oxide of 1.5kg polypropylene glycol, 0.02kg non-ionic polyacrylamide,
380kg water.Plastic concrete is made according to preparation method of the present invention.
The preparation method of the plastic concrete of above embodiments 1~5 is equal are as follows:
(1) ether alcohol sulfate is uniformly mixed at 20~40 DEG C with the water of 90% weight, then the sodium base with water weight 11%
Bentonite is stirred 15min under 3000r/min revolving speed, is then allowed to stand extruding for 24 hours, bentonite slurry is made.
(2) non-ionic polyacrylamide is uniformly mixed at 60~80 DEG C with the water of 10% weight, is cooled to 20~40
DEG C, then successively mixed with the addition product of polyethylene glycol Hydrophilic nonionic fluorocarbon surfactant, the ethylene oxide of polypropylene glycol,
Under 200r/min revolving speed, it is stirred 10min, adjusting liquid is made.
(3) it is gradually added by partial size is descending, melon seeds piece, rice sand, coarse sand, clay, cement, bentonite is mixed into one
It rises, it is every to add a kind of 5~10min of material stirring, mixed dry material is made.
(4) mixed dry material is first uniformly mixed with adjusting liquid, then be uniformly mixed with bentonite slurry to get the anti-of anti-inorganic salts
Infiltration plastic concrete.
Comparative example 1
Every cube of plastic concrete meter, 180kg cement (42.5 ordinary portland cement), 60kg sodium base bentonite (model
With embodiment 1), 90kg clay (model is with embodiment 1), 465kg coarse sand (model is with embodiment 1), (model is same for 465kg meters of sand
Embodiment 1), 465kg melon seeds piece, 330kg water.
The preparation method comprises the following steps: water is added into bentonite, static extruding for 24 hours, by clay, coarse sand, rice sand, melon seeds piece and cement
By partial size it is descending sequence mixing, then by its with after extruding bentonite and water, other raw materials mix, in 3000r/
Under min revolving speed, it is stirred 15min.
The performance of 1 gained plastic concrete of above embodiments 1~5 and comparative example is as shown in table 1 below.
Table 1
The above, preferable possible embodiments only of the invention, the range being not intended to limit the invention.More than
It is merely a preferred embodiment of the present invention, is not intended to restrict the invention, for those skilled in the art, the present invention
There can be various modifications and variations.All within the spirits and principles of the present invention, any modification, equivalent replacement, improvement
Deng should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of compound impervious wall for soft clay area landfill yard environmental protection, the water barrier including being embedded in landfill yard underground,
It is characterised in that it includes the depth of the flexible core wall, which meets from earth's surface, to be extended around the flexible core wall of setting in landfill yard one week
It is embedded in water barrier, is respectively arranged with plasticity wall inside and outside the flexible core wall, in internal plasticity wall
Side and knee wall is respectively set on the outside of external plasticity wall, is arranged between inboard knee wall and landfill yard
There is transition region, transition region is provided with underground water pump-drainage well.
2. being used for the compound impervious wall of soft clay area landfill yard environmental protection according to claim 1, which is characterized in that described
Flexible core wall is made of the HDPE geomembrane of at least 3.0mm thickness, whole infiltration coefficient≤10-8cm/s；The plasticity wall is prevented
Seep coefficient≤5 × 10-8Cm/s, thickness >=600mm, the knee wall by around one week setting multiple high-pressure rotary jet grouting piles construct and
At, single pile diameter >=800mm, it is engaged 200mm between stake, pile center's line and plasticity wall sideline horizontal distance >=single pile radius+
300mm。
3. being used for the compound impervious wall of soft clay area landfill yard environmental protection according to claim 1, which is characterized in that described
The depth of knee wall and plasticity wall is identical as the depth of flexible core wall, ground in the deep well pump control well of the underground water pump-drainage well
It is lauched water level and is consistently lower than landfill yard base impervious layer 3m, while being no less than lower than compound impervious wall periphery groundwater level
1m。
4. being used for the compound impervious wall of soft clay area landfill yard environmental protection according to claim 1, which is characterized in that described
Plasticity wall is symmetrically poured composition in such a way that plastic concrete is by underwater pouring, in the two sides of the flexible core wall,
The plastic concrete is by cement, bentonite, clay, coarse sand, rice sand, melon seeds piece, polyoxyethylated ionic surfactant
Agent, fluorocarbon surfactant, polyether nonionic surfactant, non-ionic polyacrylamide and water are constituted, specific weight
It is as follows to measure number:
Cement: 150-210 parts；
Bentonite: 40-80 parts；
Clay: 75-105 parts；
Middle sand: 398-513 parts；
Rice sand: 398-513 parts；
Melon seeds piece: 398-513 parts；
Polyoxyethylated ionic surfactant: 0.6-1 parts；
Fluorocarbon surfactant: 0.1-2 parts；
Polyether nonionic surfactant: 0.5-1.5 parts；
Non-ionic polyacrylamide: 0.0002-0.02 parts；
Water: 300-380 parts.
5. being used for the compound impervious wall of soft clay area landfill yard environmental protection according to claim 4, which is characterized in that
The cement is portland cement；
The bentonite selects sodium bentonite, and granularity meets 400 mesh screen residues and is not more than 10%；
The clay selects silty clay, and moisture content is not more than 8%, and granularity meets 100 mesh screen residues and is not more than 10%；
The coarse sand selects river sand, partial size 0.5-3mm；
The rice sand, which is that mountain cobble is broken, to be formed, partial size 3-5mm；
The melon seeds piece, which is that mountain cobble is broken, to be formed, partial size 5-10mm；
The coarse sand: rice sand: the weight ratio of melon seeds piece is 1:1:1；
The polyoxyethylated ionic surfactant is ether alcohol sulfate；
The fluorocarbon surfactant selects polyethylene glycol Hydrophilic nonionic fluorocarbon surfactant；
The polyether nonionic surfactant is the addition product of the ethylene oxide of polypropylene glycol, and wherein ethylene oxide number is
40-50。
6. being used for the compound impervious wall of soft clay area landfill yard environmental protection according to claim 4, which is characterized in that described
Plastic concrete is prepared by following steps:
Step A: polyoxyethylated ionic surfactant and a certain proportion of water, a certain proportion of bentonite are mixed,
It is then allowed to stand extruding, bentonite slurry is made；
Step B: by non-ionic polyacrylamide and remaining water, fluorocarbon surfactant, polyether nonionic surfactant
It mixes, adjusting liquid is made；
Step C: melon seeds piece, rice sand, coarse sand, clay, cement and remaining bentonite are mixed one by one by partial size is descending
Be formed together mixed dry material, then with the bentonite slurry, the adjusting liquid mix to get.
7. being used for the compound impervious wall of soft clay area landfill yard environmental protection according to claim 6, which is characterized in that described
Water used in step A is the 90% of total Water, and water used and bentonite mass ratio used are 100:10~15.
8. a kind of construction method of the compound impervious wall for soft clay area landfill yard environmental protection, which is characterized in that specific packet
Include following steps:
Step 1: the knee wall at two layers of interval being arranged around the periphery of landfill yard to underground, and the depth of knee wall meets from earth's surface
Extension is embedded in water barrier；
Step 2: flexible core wall is set in two layers of the intermediate of knee wall, the depth of the flexible core wall meets embedding from earth's surface extension
Enter to water barrier；
Step 3: plasticity wall is set between the inner peripheral and ectonexine knee wall of flexible core wall；
Step 4: underground water pump-drainage well is arranged in the transition region between internal layer knee wall and landfill yard.
9. the construction method of the compound impervious wall according to claim 8 for the environmental protection of soft clay area landfill yard,
It is characterized in that, in the step 2 flexible core wall selection 3.0mm thickness HDPE geomembrane, single width width 4.1m, around filling out
It buries field and several HDPE geomembranes is circumferentially set, the two sides of adjacent HDPE geomembrane are welded to each other E type lock, using Film opening roll
Cylinder vehicle and gravity lower film machine complete the installation of HDPE geomembrane.
10. the construction method of the compound impervious wall according to claim 8 for the environmental protection of soft clay area landfill yard,
It is characterized in that, plasticity wall is poured using plastic concrete in the step 3, and using steel conduit that mixing is good
Plastic concrete bottom-up casting by the way of underwater pouring, led around a piece steel of circumferentially-spaced setting
Pipe, groove body bottom certain distance of the first steel conduit of depth direction on water barrier, every casting designated depth are promoted primary
Conduit, until be poured into and flushed with ground, the plastic concrete by cement, bentonite, clay, coarse sand, rice sand, melon seeds piece,
It is polyoxyethylated ionic surfactant, fluorocarbon surfactant, polyether nonionic surfactant, non-ionic poly-
Acrylamide and water are constituted.
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| CN201811135797.0A CN109056764B (en) | 2018-09-28 | 2018-09-28 | Composite impervious wall for environmental protection of landfill in soft soil area and construction method thereof |
| PCT/CN2018/110101 WO2020062340A1 (en) | 2018-09-28 | 2018-10-12 | Complex diaphragm wall for environmental protection of landfill in soft soil area, and construction method therefor |
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| CN201811135797.0A CN109056764B (en) | 2018-09-28 | 2018-09-28 | Composite impervious wall for environmental protection of landfill in soft soil area and construction method thereof |
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