CN107882075A - A kind of method that refuse landfill seepage control layer is built using river and lake silt - Google Patents

A kind of method that refuse landfill seepage control layer is built using river and lake silt Download PDF

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Publication number
CN107882075A
CN107882075A CN201710964102.9A CN201710964102A CN107882075A CN 107882075 A CN107882075 A CN 107882075A CN 201710964102 A CN201710964102 A CN 201710964102A CN 107882075 A CN107882075 A CN 107882075A
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China
Prior art keywords
river
mud
lake
refuse landfill
silt
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CN201710964102.9A
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Chinese (zh)
Inventor
王士权
陈亿军
刘磊
魏明俐
何星星
谭洵
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Wuhan Institute of Rock and Soil Mechanics of CAS
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Wuhan Institute of Rock and Soil Mechanics of CAS
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Priority to CN201710964102.9A priority Critical patent/CN107882075A/en
Publication of CN107882075A publication Critical patent/CN107882075A/en
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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
    • E02D31/02—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 against ground humidity or ground water
    • 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
    • E02D31/02—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 against ground humidity or ground water
    • E02D31/04—Watertight packings for use under hydraulic pressure

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Structural Engineering (AREA)
  • Environmental & Geological Engineering (AREA)
  • Hydrology & Water Resources (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Treatment Of Sludge (AREA)

Abstract

The present invention relates to a kind of method that refuse landfill seepage control layer is built using river and lake silt, including：River and lake silt is obtained by the desilting of river lake；Bulky grain solid material screening in river and lake silt is removed into acquisition and tails over mud；By modifying agent with tailing over stirring to obtain mixing mud after mud mixes；Mixing mud is dehydrated to form modified mud；Modified mud layered rolling is formed into compacted cohesive soil layer in the geotextiles of refuse landfill.This method builds refuse landfill seepage control layer using river and lake silt, makes river and lake silt recycling and saves clay material.

Description

A kind of method that refuse landfill seepage control layer is built using river and lake silt
Technical field
It is more particularly to a kind of to build refuse landfill using river and lake silt the present invention relates to environmental geotechnical technical field The method of impervious barrier.
Background technology
China human mortality is numerous, produces substantial amounts of house refuse every year, wherein more than 80% house refuse is filled out using health Bury disposal.Liner system is the most important part of refuse landfill, liner system typically by basal layer, impervious barrier, ooze drip Liquid collects guide system and underground water collects guide system composition.No matter individual layer liner system or composite pad system, are required to Compacted cohesive soil is as impervious barrier or soil protection layer.《Sanitary Landfill seepage control system engineering legislation》 (CJ113-2007) regulation compacted cohesive soil thickness cannot be less than 2m in individual layer liner system, must not be small in composite pad system In 0.75m, infiltration coefficient cannot be greater than 1.0 × 10-7cm/s.In addition, the soil property pad of Modern landfill field must have enough Intensity to bear the high pressure of overlying rubbish, otherwise large deformation sedimentation can cause impervious barrier fracture failure and Leachate site seepage.
In addition, in order to improve the water quality of rivers and lakes and flood carrying capacity, the river lake on China down town and periphery is annual all Carry out large-scale desilting engineering, so as to produce a large amount of dredging silts.Dredging silt has high-moisture percentage, high organic, low Intensity and the engineering characteristic of hyposmosis, it is difficult to be directly used as engineering material.The cost of disposal of the huge mud of the scale of construction is very high, ring The secondary pollution risk in border is big.
There is no also correlation technique river and lake silt can be used to build refuse landfill seepage control layer in the prior art.
The content of the invention
The invention provides a kind of method that refuse landfill seepage control layer is built using river and lake silt, solves or part solves Having determined can not use river and lake silt to build the technical problem of refuse landfill seepage control layer in the prior art, realize and become silted up using river lake Mud builds refuse landfill seepage control layer, makes river and lake silt recycling and saves the technique effect of clay material.
A kind of method that refuse landfill seepage control layer is built using river and lake silt provided by the invention, including：
By the desilting of river lake, river and lake silt is obtained；
Bulky grain solid material screening in the river and lake silt is removed, acquisition tails over mud；
Modifying agent is tailed over into stirring to obtain mixing mud after mud mixes with described；By percentage to the quality, the modification Agent is 1 with the mixed proportion for tailing over mud：18~22；The modifying agent includes：Flyash and lime；
The mixing mud is dehydrated to form modified mud；
The modified mud layered rolling is formed into compacted cohesive soil layer in the geotextiles of the refuse landfill.
Preferably, before the desilting of the river lake, multi-point sampling is carried out to the river lake and is reconnoitred, determines the river lake The mechanics index of physics of mud and the mud average thickness for measuring the river lake bottom；
Determined to treat dredging silt amount according to the mud average thickness；
The mechanics index of physics includes：Gravel content, the content of organic matter, pollutant characteristic, natural density, shearing strength And granulometric composition；
The desilting acquisition river and lake silt is inhaled by twisting comprehensively in the river lake.
Preferably, the bulky grain solid material in the river and lake silt is sieved by vibratory sieve and removed.
Preferably, the mass percent of the flyash and the lime in the modifying agent is 3:1.
Preferably, the mixing mud forms the modified mud by plate and frame filter press extrusion dehydration.
Preferably, before the modified mud layered rolling, the modified mud is transported to the garbage loading embeading Field job site carries out shelving stockpiling.
Preferably, before the modified mud layered rolling, Indoor Impaction Test is carried out to the modified mud, with Determine the optimum moisture content of the modified mud；
After the modified mud watering regulation to the optimum moisture content, then by the modified mud layered rolling in institute State in the geotextiles of refuse landfill.
One or more technical schemes provided herein, have at least the following technical effects or advantages：
It is raw material as a result of the primary mud in river lake, sieves modified construction refuse landfill pad system antiseepage Layer, the lower mud inside of modifying agent effect occur pozzolanic reaction, change sludge granules form, size and physico-mechanical properties Become；Modified mud hits the real infiltration coefficient that can be formed after rolling less than 1.0 × 10-7Cm/s, shearing strength reach the cementing of 1-5MPa Solidify impervious barrier, it is sufficient to carry the pressure of overlying rubbish, reduce settlement of foundation, avoid impervious barrier cracking or geotechnological film stretching from breaking It is bad, the overall barrier properties and bearing capacity of liner system are improved, meanwhile, impervious barrier resistance Leachate site erosion performance increases By force, the heavy metal ion in the adsorbable Leachate site of the organic composition such as humic acid in mud；Former material is used as by the use of river and lake silt Material, makes river and lake silt recycling, has saved clay material.So, river lake can not be used in the prior art by efficiently solving Mud builds the technical problem of refuse landfill seepage control layer, realizes and builds refuse landfill seepage control layer using river and lake silt, makes River and lake silt recycling and the technique effect for saving clay material.
Brief description of the drawings
Fig. 1 is that the flow of the method provided in an embodiment of the present invention that refuse landfill seepage control layer is built using river and lake silt is shown It is intended to.
Embodiment
The embodiment of the present application provide it is a kind of using river and lake silt build refuse landfill seepage control layer method, solve or Part solves the technical problem that river and lake silt can not be used to build refuse landfill seepage control layer in the prior art, by using river The primary mud in lake is raw material, sieves modified construction refuse landfill pad system impervious barrier, realizes and utilize river and lake silt Refuse landfill seepage control layer is built, makes river and lake silt recycling and saves the technique effect of clay material.
Referring to accompanying drawing 1, a kind of method that refuse landfill seepage control layer is built using river and lake silt provided by the invention is included：
S1：By the desilting of river lake, river and lake silt is obtained；Specifically desilting process is：Desilting acquisition is inhaled by twisting comprehensively in river lake River and lake silt.Substantial amounts of river and lake silt material can be obtained by performing desilting, there is provided and sufficient impervious barrier builds raw material, while to river The judgement of Lake Water and flood carrying capacity has positive effect.Before the desilting of river lake, multi-point sampling is carried out to river lake and is reconnoitred, is surveyed Determine the mechanics index of physics of river and lake silt and measure the mud average thickness of river lake bottom；Determined according to mud average thickness Treat dredging silt amount；Mechanics index of physics includes：Gravel content, the content of organic matter, pollutant characteristic, natural density, shearing resistance are strong Degree and granulometric composition；Mechanics index of physics can targetedly understand the state of river and lake silt, according to mud mechanics index of physics Energy, refuse landfill pad system design scheme and construction speed can determine that required mud side's amount and modified technique.
S2：Bulky grain solid material screening in river and lake silt is removed, acquisition tails over mud；Big in river and lake silt Grain solid material is sieved by vibratory sieve and removed.
S3：By modifying agent with tailing over stirring to obtain mixing mud after mud mixes；Modifying agent includes：Flyash and lime； The dosage of modifying agent should ensure that being modified mud has preferable plasticity, trigger long-term fire after ensuring compacting stratification again Mountain ash reaction, form the impervious barrier of cementation solidifying.By percentage to the quality, modifying agent and the mixed proportion for tailing over mud are 1：18 ~22.The mass percent of flyash and lime in modifying agent is 3:1.Modifying agent can increase water penetration during filter-press dehydration, Dehydration rate is improved, the modifying agent that flyash forms with lime blending triggers pozzolanic reaction, and reaction product can strengthen mud Plasticity and water resistance, and pozzolanic reaction speed is slow, and enough durations are provided for construction.
S4：Mixing mud is dehydrated to form modified mud；Specially：Mixing mud passes through plate and frame filter press extrusion dehydration shape Into the modified mud.
S5：Modified mud layered rolling is formed into compacted cohesive soil layer in the geotextiles of refuse landfill；Specially：Changing Property mud hit real roll before, one layer of geotextiles are laid on the basal layer of liner system, are then ground in geotextiles higher slice The modified mud of pressure, until reaching the compacted cohesive soil thickness degree of design.
S6：Compacting mud impervious barrier is obtained after the water of set amount is spilt on compacted cohesive soil layer.Specially：According to local weather Situation, compacted cohesive soil layer is suitably sprinkled water, compacting mud impervious barrier can be formed after maintenance in 7-28 days.
Wherein, refuse landfill pad system antiseepage layer material is fabricated to by being sieved and being modified to dredging silt, Fully reduce the troublesome operation for transporting outward a large amount of dredging silts and high Cost Problems；Under lime and fly ash material modifying function, Pozzolanic reaction occurs inside mud, generates gelling hydrated product, the infiltration coefficient of compacting mud impervious barrier is smaller than 1.0 × 10-7Cm/s, shearing strength reach 1-5MPa, it is sufficient to carry the pressure of overlying rubbish, reduce settlement of foundation, avoid impervious barrier from ftractureing Or geomembrane tensile failure；Meanwhile be compacted produce cementation solidifying inside mud impervious barrier, resistance Leachate site erosion performance increases By force, the heavy metal ion in the adsorbable Leachate site of the organic composition such as humic acid in mud.
Further, before modified mud layered rolling, modified mud is transported to refuse landfill job site and entered Row shelving is stored up.After forming compacting mud impervious barrier, field sampling is carried out to compacting mud impervious barrier by cutting ring and obtains sample； Permeability test and unconfined compression test are carried out to sample, with determine to be compacted mud impervious barrier ooze the saturating coefficient of intensity and shearing resistance is strong Whether degree meets design requirement.
Further, before modified mud layered rolling, according to《Standard for test methods of earthworks》(GB/T50123- 1999) Indoor Impaction Test is carried out to modified mud, to determine the optimum moisture content of modified mud；In modified mud layered rolling Before, modified mud watering is adjusted to optimum moisture content, then geotechnique of the mud layered rolling in refuse landfill will be modified On cloth, ensure that the compacted cohesive soil layer after modified mud compacting reaches maximum density.
Preventing using river and lake silt construction refuse landfill for the application offer is discussed in detail below by specific embodiment The method of infiltration layer：
With tubular type sludge sampler, multi-point sampling is reconnoitred in certain lake, and measuring bottom sludge layer average thickness is 1.5m, area of lake are 400,000 m2, current depth of water 2m, laboratory test test result is as follows：Gravel content 8% (accounting for dry weight), have Machine matter content 6% (accounting for dry weight), natural density 1.3t/m3, clay content 55%, contamination-free, it is final determine using twist inhale it is clear Become silted up, it is 600,000 m to treat dredging silt amount3。
The design of refuse landfill is：Landfill yard bottom area is 200,000 m2, system is padded using compacted cohesive soil individual layer System, compacted cohesive soil thickness degree are 2.0m, and infiltration coefficient is less than 1.0 × 10-7Cm/s, shearing strength are more than 300kPa.
Lake twist comprehensively and inhales desilting, dredging mud is delivered to sludge treatment system, first separated using Vibration Screen Sandstone, 50kg modifying agent (flyash is then added in mud to per ton tail over：Lime=3：1) mixing mud is formed, then will be mixed Close mud injection plate and frame filter press progress extrusion dehydration and form modified mud cake, 450,000 m are obtained3Modified mud cake, then carry it Stored up to landfill yard job site shelving.
According to《Standard for test methods of earthworks》(GB/T 50123-1999) carries out Indoor Impaction Test to modified mud, really Surely the optimum moisture content of modified mud is 35%, and is modified mud due to storing up dehydration, and moisture content is reduced to 25%, therefore to changing Property mud watering until moisture content be 35%.
Before modified mud carries out hitting real roll, one layer of geotextiles are laid on liner system basal layer, then in geotechnique Cloth higher slice rolls modified mud, until reaching compacted cohesive soil layer design thickness 1.5m.
According to local weather conditions, the modification mud of compacting is suitably sprinkled water, after maintenance in 15 days, uses cutting ring Field sampling sends laboratory back to and carries out permeability test and unconfined compression test, the results showed that infiltration coefficient is 6.0 × 10-9cm/ S, shearing strength 2.0MPa, much meets design requirement.
One or more technical schemes provided herein, have at least the following technical effects or advantages：
It is raw material as a result of the primary mud in river lake, sieves modified construction refuse landfill pad system antiseepage Layer, the lower mud inside of modifying agent effect occur pozzolanic reaction, change sludge granules form, size and physico-mechanical properties Become；Modified mud hits the real infiltration coefficient that can be formed after rolling less than 1.0 × 10-7Cm/s, shearing strength reach the cementing of 1-5MPa Solidify impervious barrier, it is sufficient to carry the pressure of overlying rubbish, reduce settlement of foundation, avoid impervious barrier cracking or geotechnological film stretching from breaking It is bad, the overall barrier properties and bearing capacity of liner system are improved, meanwhile, impervious barrier resistance Leachate site erosion performance increases By force, the heavy metal ion in the adsorbable Leachate site of the organic composition such as humic acid in mud；Former material is used as by the use of river and lake silt Material, makes river and lake silt recycling, has saved clay material.So, river lake can not be used in the prior art by efficiently solving Mud builds the technical problem of refuse landfill seepage control layer, realizes and builds refuse landfill seepage control layer using river and lake silt, makes River and lake silt recycling and the technique effect for saving clay material.
Above-described embodiment, the purpose of the present invention, technical scheme and beneficial effect are carried out further Describe in detail, should be understood that the embodiment that the foregoing is only the present invention, be not limited to this hair It is bright, within the spirit and principles of the invention, any modification, equivalent substitution and improvements done etc., it should be included in the present invention Protection domain within.

Claims (7)

  1. A kind of 1. method that refuse landfill seepage control layer is built using river and lake silt, it is characterised in that including：
    By the desilting of river lake, river and lake silt is obtained；
    Bulky grain solid material screening in the river and lake silt is removed, acquisition tails over mud；
    Modifying agent is tailed over into stirring to obtain mixing mud after mud mixes with described；By percentage to the quality, the modifying agent with The mixed proportion for tailing over mud is 1：18~22；The modifying agent includes：Flyash and lime；
    The mixing mud is dehydrated to form modified mud；
    The modified mud layered rolling is formed into compacted cohesive soil layer in the geotextiles of the refuse landfill.
  2. 2. the method for refuse landfill seepage control layer is built using river and lake silt as claimed in claim 1, it is characterised in that
    Before the desilting of the river lake, multi-point sampling is carried out to the river lake and is reconnoitred, determines the physical force of the river and lake silt Learn index and measure the mud average thickness of the river lake bottom；
    Determined to treat dredging silt amount according to the mud average thickness；
    The mechanics index of physics includes：Gravel content, the content of organic matter, pollutant characteristic, natural density, shearing strength and Granulometric composition；
    The desilting acquisition river and lake silt is inhaled by twisting comprehensively in the river lake.
  3. 3. the method for refuse landfill seepage control layer is built using river and lake silt as claimed in claim 1, it is characterised in that
    Bulky grain solid material in the river and lake silt is sieved by vibratory sieve to be removed.
  4. 4. the method for refuse landfill seepage control layer is built using river and lake silt as claimed in claim 1, it is characterised in that
    The mass percent of the flyash and the lime in the modifying agent is 3:1.
  5. 5. the method for refuse landfill seepage control layer is built using river and lake silt as claimed in claim 1, it is characterised in that
    The mixing mud forms the modified mud by plate and frame filter press extrusion dehydration.
  6. 6. the method for refuse landfill seepage control layer is built using river and lake silt as claimed in claim 1, it is characterised in that
    Before the modified mud layered rolling, the modified mud is transported to the refuse landfill job site and carried out Shelving is stored up.
  7. 7. the method for refuse landfill seepage control layer is built using river and lake silt as claimed in claim 1, it is characterised in that
    Before the modified mud layered rolling, Indoor Impaction Test is carried out to the modified mud, to determine the modification The optimum moisture content of mud；
    After the modified mud watering regulation to the optimum moisture content, then by the modified mud layered rolling in the rubbish In the geotextiles of rubbish landfill yard.
CN201710964102.9A 2017-10-17 2017-10-17 A kind of method that refuse landfill seepage control layer is built using river and lake silt Pending CN107882075A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109736331A (en) * 2018-12-24 2019-05-10 葛洲坝中固科技股份有限公司 A kind of construction method for building landscape mountain using mud and agriculture and forestry organic waste material heap
CN110218038A (en) * 2019-07-15 2019-09-10 武汉轻工大学 A kind of preparation method of landfill yard bottom cushion material
CN111350209A (en) * 2018-12-24 2020-06-30 葛洲坝中固科技股份有限公司 Curing agent-silt soil mixed cushion layer for site anti-seepage treatment
CN115069720A (en) * 2022-05-23 2022-09-20 武汉泾渭环境科技有限公司 Transpiration covering structure of refuse landfill and preparation method

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4518508A (en) * 1983-06-30 1985-05-21 Solidtek Systems, Inc. Method for treating wastes by solidification
CN102092916A (en) * 2010-12-16 2011-06-15 无锡利得生态环境科技有限公司 Biological solidification and stabilization method of bottom mud in riverways and lakes
CN103880379A (en) * 2014-02-15 2014-06-25 江苏坤泽科技股份有限公司 Environment-friendly nickel alloy slag composite curing material for flat sludge

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4518508A (en) * 1983-06-30 1985-05-21 Solidtek Systems, Inc. Method for treating wastes by solidification
CN102092916A (en) * 2010-12-16 2011-06-15 无锡利得生态环境科技有限公司 Biological solidification and stabilization method of bottom mud in riverways and lakes
CN103880379A (en) * 2014-02-15 2014-06-25 江苏坤泽科技股份有限公司 Environment-friendly nickel alloy slag composite curing material for flat sludge

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109736331A (en) * 2018-12-24 2019-05-10 葛洲坝中固科技股份有限公司 A kind of construction method for building landscape mountain using mud and agriculture and forestry organic waste material heap
CN111350209A (en) * 2018-12-24 2020-06-30 葛洲坝中固科技股份有限公司 Curing agent-silt soil mixed cushion layer for site anti-seepage treatment
CN110218038A (en) * 2019-07-15 2019-09-10 武汉轻工大学 A kind of preparation method of landfill yard bottom cushion material
CN115069720A (en) * 2022-05-23 2022-09-20 武汉泾渭环境科技有限公司 Transpiration covering structure of refuse landfill and preparation method

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Application publication date: 20180406