CN109020312A - A kind of sand for refuse landfill-attapulgite vertical impermeable wall material and its preparation method - Google Patents

A kind of sand for refuse landfill-attapulgite vertical impermeable wall material and its preparation method Download PDF

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Publication number
CN109020312A
CN109020312A CN201810598888.1A CN201810598888A CN109020312A CN 109020312 A CN109020312 A CN 109020312A CN 201810598888 A CN201810598888 A CN 201810598888A CN 109020312 A CN109020312 A CN 109020312A
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China
Prior art keywords
attapulgite
sand
refuse landfill
impermeable wall
vertical
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CN201810598888.1A
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Inventor
张文兵
饶文波
李磊
王帅
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Hohai University HHU
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Hohai University HHU
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Priority to CN201810598888.1A priority Critical patent/CN109020312A/en
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    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/001Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing unburned clay
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D19/00Keeping dry foundation sites or other areas in the ground
    • E02D19/06Restraining of underground water
    • E02D19/12Restraining of underground water by damming or interrupting the passage of underground water
    • E02D19/18Restraining 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
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00017Aspects relating to the protection of the environment
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00241Physical properties of the materials not provided for elsewhere in C04B2111/00
    • C04B2111/00293Materials impermeable to liquids
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00474Uses not provided for elsewhere in C04B2111/00
    • C04B2111/00767Uses not provided for elsewhere in C04B2111/00 for waste stabilisation purposes
    • C04B2111/00775Uses not provided for elsewhere in C04B2111/00 for waste stabilisation purposes the composition being used as waste barriers or the like, e.g. compositions used for waste disposal purposes only, but not containing the waste itself
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2300/00Materials
    • E02D2300/0037Clays

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Hydrology & Water Resources (AREA)
  • Ceramic Engineering (AREA)
  • Structural Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Civil Engineering (AREA)
  • Paleontology (AREA)
  • Mining & Mineral Resources (AREA)
  • Dispersion Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Processing Of Solid Wastes (AREA)
  • Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)

Abstract

The invention discloses a kind of sand for refuse landfill-attapulgite vertical impermeable wall materials, belong to refuse landfill vertical seepage control technical field, including normal sand and powdered attapulgite, wherein, normal sand weight percent is no more than 90%, and surplus is powdered attapulgite.Invention also discloses its configuration methods.It is of the invention to propose a kind of new sand-attapulgite vertical impermeable wall material, solve the problems, such as some existing for soil-bentonite cut-pff wall material, when attapulgite content is not less than 30% in backfill material, osmotic coefficient k is lower than 10‑9M/s, while in order to control the compressibility of backfill material, attapulgite content is no more than 60% in backfill material.Configuration method step of the invention is simple, and attapulgite is huge in reserves in China, cheap;Attapulgite is applied to refuse landfill vertical impermeable wall material, the anti-pollution of cut-pff wall not only can be improved, but also construction cost can be saved, while expanding attapulgite in the application of environment protection field.

Description

A kind of sand for refuse landfill-attapulgite vertical impermeable wall material and its match Method processed
Technical field
The invention belongs to refuse landfill vertical seepage control technical fields, and in particular to a kind of sand-for refuse landfill Attapulgite vertical impermeable wall material and its preparation method.
Background technique
Currently, Chinese MSW research yield is just increased close to 200,000,000 tons/year with 10% speed, has seriously threatened ecological ring Border and resident's health.The landfill yard of China's early stage construction is mostly relatively simple, mainly using natural clay layer as impervious lining. Many Mini nutritionalassessment percolates cause serious pollution to periphery water and soil.Due to there is no method to its substrate antiseepage, in order to anti- Only Mini nutritionalassessment leaks the influence to surrounding enviroment, and vertical seepage control is particularly important.
Vertical seepage control system is widely used in the waste treatment project of existing landfill yard.Soil-swelling soil series vertical impermeable wall Since easy construction, low in cost, permeability are low, (osmotic coefficient k is usually 10-9~10-11It m/s is answered in vertical seepage control system With more popular one kind.
However existing scholar is research shows that the increase of the concentration of electrolyte and organic solution can significantly improve soil-bentonite antiseepage The permeability of walling material makes the reduction of its anti-pollution, and the concentration of pollutants from landfill leachate is generally all very high;Due to long-term Groundwater level fluctuation, soil-bentonite vertical impermeable wall top is constantly subjected to drying and watering cycle, and infiltration coefficient also will increase.
Attapulgite is a kind of clay mineral with chain layer structure, and compared with bentonite, attapulgite has three-dimensional Space structure is not in the dilatancy of montmorillonite type, and dry contraction is small, and does not generate cracking;Attapulgite has only simultaneously Special fibre structure, makes it have higher absorption property, and high temperature resistant, salt resistance alkali.The specific surface area of attapulgite is up to 150~210m2/ g, some is up to 423m after processing2/g.Therefore attapulgite is widely used at environment protection field, including sewage Reason, exhaust-gas treatment, heavy-metal contaminated soil reparation etc..
Concave-convex clay rod resource is fewer in the world, is distributed only over a few countries, and China is that the world is main recessed Convex stick stone clay contains state and producing country, and reserves are huge, from a wealth of sources, cheap, is readily produced, has a extensive future, tool There is the laudatory title of " thousand kinds of kings with soil, ten thousand soil ".
Attapulgite as a kind of widely used clay, refuse landfill vertical seepage control field application study also very It is few.
Summary of the invention
Goal of the invention: the purpose of the present invention is to provide a kind of sand for refuse landfill-attapulgite vertical seepage controls Walling material creatively uses normal sand and attapulgite in cut-pff wall material;It is another object of the present invention to disclose its configuration Method.
Technical solution: to achieve the above object, the invention provides the following technical scheme:
A kind of sand for refuse landfill-attapulgite vertical impermeable wall material, including normal sand and powdered bumps Stick soil, wherein the weight percent of normal sand is no more than 90%.
The weight percent of the normal sand is 20%~90%, the weight percent of the powdered attapulgite It is 10%~80%, and the sum of above-mentioned each component is 100%.
The partial size of the powdered attapulgite is below 200 mesh.
The weight percent of the powdered attapulgite is not less than 30% and is not higher than 60%.
A kind of sand for refuse landfill-attapulgite vertical impermeable wall material preparation method, including with Lower step:
1) the arenaceous stratum soil in using normal sand as refuse landfill vertical impermeable wall digging process, in proportion toward standard Attapulgite is added in sand, obtains sand-attapulgite backfill material;
2) sand-attapulgite backfill material is uniformly mixed with water, to obtain sand-attapulgite for refuse landfill Vertical impermeable wall material.
In step 2), the additive amount of the water makes sand-attapulgite backfill material meet slump 100mm~150mm.
The utility model has the advantages that compared with prior art, of the invention proposes a kind of new sand-attapulgite vertical seepage control walling Material, solves the problems, such as it is some existing for soil-bentonite cut-pff wall material, when attapulgite content is not less than 30% in backfill material, Its osmotic coefficient k is lower than 10-9M/s, while in order to control the compressibility of backfill material, attapulgite content is no more than in backfill material 60%.Configuration method step of the invention is simple, and attapulgite is huge in reserves in China, cheap;Attapulgite is answered For refuse landfill vertical impermeable wall material, the anti-pollution of cut-pff wall not only can be improved, but also construction cost can be saved, together When expand attapulgite environment protection field application.
Detailed description of the invention
Fig. 1 is sand-attapulgite vertical impermeable wall material cake compressibility (Cc) with attapulgite content in materials for wall Change curve;
Fig. 2 is variation of the sand-attapulgite vertical impermeable wall material permeability coefficient k with attapulgite content in materials for wall Curve.
Specific embodiment
The present invention will be further explained in the following with reference to the drawings and specific embodiments.
A kind of sand for refuse landfill-attapulgite vertical impermeable wall material, including normal sand and powdered bumps Stick soil, wherein the weight percent of normal sand is no more than 90%, and surplus is powdered attapulgite.
The weight percent of normal sand is 20%~90%, the weight percent of powdered attapulgite is 10%~ 80%, and the sum of above-mentioned each component is 100%.
The partial size of powdered attapulgite is below 200 mesh.
The weight percent of powdered attapulgite is not less than 30% and is not higher than 60%.
A kind of preparation method of the sand for refuse landfill-attapulgite vertical impermeable wall material, comprising the following steps:
1) the arenaceous stratum soil in using normal sand as refuse landfill vertical impermeable wall digging process, in proportion toward standard Attapulgite is added in sand, obtains sand-attapulgite backfill material;
2) sand-attapulgite backfill material is uniformly mixed with water, to obtain sand-attapulgite for refuse landfill Vertical impermeable wall material.
In step 1), the attapulgite by adding different content into normal sand is configured to different attapulgite contents Sand-attapulgite backfill material.Wherein the attapulgite content in backfill material can depend on the circumstances, bumps used in the present invention The ratio that stick soil accounts for backfill material is 10%, 20%, 30%, 40%, 60% and 80% respectively.
In step 2), the backfill material and water is uniform, wherein the additive amount of water will make sand-attapulgite backfill material satisfaction collapse Degree of falling is the requirement of 100mm~150mm, and what is chosen in the present invention is the addition of water when backfill material being made to meet the 100mm slump Amount, specific 2 slump consistancy test of implementation method square method.Specific proportion is shown in Table 1.
Sand-attapulgite divider wall material compressibility and infiltration are studied by consolidation test and rigid walls permeability test Property.Backfill material is the sand-for being respectively provided with 10%, 20%, 30%, 40%, 60% and 80% attapulgite content (AC) (dry weight) Attapulgite mixture.Test result is shown in Table 2.
The proportion of 1 six groups of backfill material of table
The test result of 2 six groups of backfill material of table
Backfill material number Cake compressibility (Cc) Infiltration coefficient, k (m/s)
A10S90 0.081 5.9×10-9
A20S80 0.137 3.0×10-9
A30S70 0.197 6.4×10-10
A40S60 0.274 4.9×10-10
A60S40 0.358 2.3×10-10
A80S20 0.542 1.3×10-10
1, sand-attapulgite cut-pff wall material
Sand-attapulgite backfill material is made of normal sand and powdered attapulgite, wherein attapulgite additive amount (AC) 10%, 20%, 30%, 40%, 60% and 80% respectively (the dry weight ratio that attapulgite accounts for backfill material), be denoted as A10S90, A20S80, A30S70, A40S60, A60S40 and A80S20.
2, slump consistancy test
Moisture content (w) when in order to determine that backfill material reaches the 100mm slump (Δ H), according to " normal concrete mixture Method for testing performance standard " (GB/T 50080-2002) to backfill expect carry out slump consistancy test.Choose slump Δ H=100mm When moisture content carry out consolidation test and rigid walls permeability test as the initial aqueous rate of sample.
3, consolidation test
According to " Standard for test methods of earthworks " (GB/T 50123-1999), press consolidation apparatus to every group of backfill material in three All carry out one-dimensional consolidation test.In order to avoid sample is squeezed out from the gap of cutting ring and permeable stone, the initial pressure of sample is arranged For 3.125kPa.Every grade of load continues for 24 hours.
4, rigid walls permeability test
The present invention is according to variable head permeability test method in " Standard for test methods of earthworks " (GB/T 50123-1999) to examination Sample permeability test.Test apparatus uses TST-55 falling head permeameter, cutting ring the internal diameter 61.8mm, high 40mm of permeameter.First will Sample consolidates under 50kPa vertical pressure and carries out permeability test again for 24 hours, and penetrating fluid is deionized water.
Fig. 1 and Fig. 2 is test result of the invention.Fig. 1 shows to backfill the cake compressibility C of materialcWith concave convex rod in backfill material The increase of native content (AC) and linearly increase, wherein Cc=0.0062AC+0.0161 (r2=0.9914), when concave-convex in backfill material When stick soil content is more than 60%, the cake compressibility for backfilling material is greater than 0.4.The compressibility of backfill material crosses senior general and causes vertical impermeable wall The biggish foundation deformation in groove periphery and displacement, to be damaged to surrounding soil and building.In order to control sand-concave convex rod The compressibility of earthen backfill material, it is proposed that attapulgite content is no more than 60% in backfill material.
Fig. 2 is the backfill material infiltration coefficient measured with rigid walls permeability test, the results showed that when attapulgite in backfill material For content in 10% and 20%, infiltration coefficient is higher than 10-9M/s (geological environment controlling value), only when concave convex rod in backfill material When native content is not less than 30%, osmotic coefficient k can just be lower than 10-9m/s。
It is feasible that the result of study of this paper, which shows that sand-attapulgite divider wall is applied to refuse landfill vertical seepage control field, , bentonite in traditional soil-bentonite divider wall can be substituted with attapulgite.In order to control sand-attapulgite divider wall Compressibility and permeability, it is proposed that the control of attapulgite content is not less than 30% and not higher than 60% in backfill material.

Claims (6)

1. a kind of sand for refuse landfill-attapulgite vertical impermeable wall material, it is characterised in that: including normal sand and powder Last shape attapulgite, wherein the weight percent of normal sand is no more than 90%.
2. a kind of sand for refuse landfill-attapulgite vertical impermeable wall material according to claim 1, feature Be: the weight percent of the normal sand is 20%~90%, and the weight percent of the powdered attapulgite is 10%~80%, and the sum of above-mentioned each component is 100%.
3. a kind of sand for refuse landfill-attapulgite vertical impermeable wall material according to claim 1, feature Be: the partial size of the powdered attapulgite is below 200 mesh.
4. a kind of sand for refuse landfill-attapulgite vertical impermeable wall material according to claim 1, feature Be: the weight percent of the powdered attapulgite is not less than 30% and not higher than 60%.
5. a kind of sand for refuse landfill-attapulgite vertical seepage control walling described in any one of claim 1-4 The preparation method of material, it is characterised in that: the following steps are included:
1) the arenaceous stratum soil in using normal sand as refuse landfill vertical impermeable wall digging process, in proportion into normal sand Attapulgite is added, obtains sand-attapulgite backfill material;
2) sand-attapulgite backfill material is uniformly mixed with water, to obtain vertical for sand-attapulgite of refuse landfill Cut-pff wall material.
6. a kind of preparation of sand for refuse landfill-attapulgite vertical impermeable wall material according to claim 5 Method, it is characterised in that: in step 2), the additive amount of the water is used in sand-attapulgite backfill material of refuse landfill Meeting the slump is 100mm~150mm.
CN201810598888.1A 2018-06-12 2018-06-12 A kind of sand for refuse landfill-attapulgite vertical impermeable wall material and its preparation method Pending CN109020312A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111362663A (en) * 2018-12-26 2020-07-03 朝阳市庆建矿业有限责任公司 Bentonite mixed soil and construction method thereof

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CN103951347A (en) * 2014-04-17 2014-07-30 常州工学院 Refuse landfill seepage-proofing slurry material and preparation method thereof
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CN111362663A (en) * 2018-12-26 2020-07-03 朝阳市庆建矿业有限责任公司 Bentonite mixed soil and construction method thereof

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