CN109137692A - A kind of gobi roadbed salt marsh chemical treatment construction - Google Patents
A kind of gobi roadbed salt marsh chemical treatment construction Download PDFInfo
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- CN109137692A CN109137692A CN201710444569.0A CN201710444569A CN109137692A CN 109137692 A CN109137692 A CN 109137692A CN 201710444569 A CN201710444569 A CN 201710444569A CN 109137692 A CN109137692 A CN 109137692A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C21/00—Apparatus or processes for surface soil stabilisation for road building or like purposes, e.g. mixing local aggregate with binder
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K17/00—Soil-conditioning materials or soil-stabilising materials
- C09K17/02—Soil-conditioning materials or soil-stabilising materials containing inorganic compounds only
- C09K17/06—Calcium compounds, e.g. lime
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
- E01C3/04—Foundations produced by soil stabilisation
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2109/00—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE pH regulation
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Inorganic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Road Paving Structures (AREA)
Abstract
The invention discloses a kind of gobi roadbed salt marsh to be chemically treated construction, is handled using calcium chloride or barium chloride soil layer, and the calcium sulfate for reacting generation is only very slightly soluble in water, and property is stablized；In addition, calcium chloride and barium chloride are nontoxic, are highly soluble in water, and are easy to prepare solution, and good penetrability is easy to be perfused, and the additional water brought by calcium chloride solution is also few；It is influenced to make chemically treated salinized soil not by lower layer's moisture and salinity, separation layer should be arranged in roadbed bottom；Not only method is simple for construction of the invention, but also advantages of nontoxic raw materials, small to environmental hazard, is a kind of safe and efficient gobi Salty Soil Subgrade construction.
Description
Technical field
The present invention relates to technical field of road construction more particularly to a kind of gobi roadbed salt marsh to be chemically treated construction.
Background technique
Shache County belongs to warm temperate continental climate, and the region that route is passed through is agro-farming oasis to Gobi desert transition region,
Dropping average water year is only 56.6mm, and annual mean ground temperature 2482.1mm, evaporation capacity is far longer than precipitation, in spring ice-snow melting
After change or summer rapid drawdown heavy rain, easily formation rainwash becomes the mineralising of saliferous after it has dissolved native intracorporal salinity on the way
Surface water, when water flow flows out mountain pass or flows decrease, forms cross flow, under strong surface evaporation, process is steamed not long
Totally, salinity in water is gathered within the scope of earth's surface or earth's surface following certain depth hair, forms salinized soil, containing salt component with
The ingredient for the salt that surface water is dissolved is directly related.Salinized soil molten sunken, sulfur acid after mainly soaking the harm of road engineering
The salt of salt ground is swollen, corrosion of the brining ground foundation to works basis.In addition, engineering material (such as sand, stone, soil) and construction water
In, if containing excessive salt, it will also result in the harm of engineering.
Summary of the invention
Based on background technique there are the problem of, the invention proposes a kind of gobi roadbed salt marsh be chemically treated construction.
Salty Soil Subgrade embankment technique and general subgrade embankment technique are similar, either mechanical equipment,
Construction procedure etc. is substantially the same, and just for salt marsh soil characteristics, is uniformly splashed using chemical agent calcium chloride, barium chloride
On filler.
Technical scheme is as follows:
A kind of gobi roadbed salt marsh chemical treatment construction, comprising the following steps:
A, preparation of construction is carried out, especially pays attention to avoiding rainy season operation as far as possible；
B, plant soil layer will be ploughed below earth's surface to excavate, and turn over 15-25cm still further below, admix calcium chloride or chlorination turning over after layer crushes
Barium；
C, turning over layer paving and leveling and carrying out watering sunning for calcium chloride or barium chloride will be admixed；
D, the water content that Dang Lupu bankets is reduced within the scope of optimum moisture content, and the grey dosage detected all meets design and specification
It is required that when, continuously it is rolled by defined compactness；
E, geotextiles are laid with；
F, sample detection enters subsequent processing if qualified；If unqualified, step C-E is repeated.
Preferably, in the step A, roadbed filling requires segmentation to carry out, and each section of length is 100m-200m.Road
Dike filling construction process will closely be connected, continuous to construct, and segmentation is completed.Should not be spaced after embankment too long build road surface or
Road surface is built after overwintering.
Preferably, in the step B, 7% or more soil layer of optimum moisture content is higher than for natural moisture content, for " sand
Change " and quick reduction water content, first add 2% calcium chloride in ditch, at least stacking three days are stewing grey, are turned once daily, make upper body
" sand " and tentatively reduce water content.
Preferably, in the step D, the plain protective soil layer that a layer thickness is no less than 25cm should be covered before winter shut-down,
Protective layer requires to be rolled by compactness not less than 85%.
Technological principle of the invention is as follows: the sulfate-salinized soil on roadbed upper layer is chemically treated, and makes the lyotropic salt in soil
Ingredient and property change, to no longer generate, salt is swollen or mitigation salt is swollen.Villaumite is mixed in sulfate-salinized soil to be reduced
Salt is swollen, because sodium sulphate its solubility in chloride solution increases with villaumite concentration and reduced.As Cl in soil-Concentration/SO2 -4
The ratio of concentration increases to 6, and the effect for inhibiting salt swollen is the most significant.This method is to the disease for administering sulfate-salinized soil roadbed
Very effectively, economic benefit is the most significant, presently used adulterating agent, and effect significantly has calcium chloride and barium chloride etc., reaction
Formula is
Na2SO4 + CaCl2 = 2NaCl + CaSO4 ↓
Na2SO4 + BaCl2 = 2NaCl + BaSO4 ↓
The invention has the beneficial effects that: gobi roadbed salt marsh of the invention is chemically treated construction, using calcium chloride or
Barium chloride handles soil layer, and the calcium sulfate for reacting generation is only very slightly soluble in water, and property is stablized.In addition, calcium chloride and barium chloride
It is nontoxic, it is highly soluble in water, and be easy to prepare solution, good penetrability is easy to be perfused, the additional water brought by calcium chloride solution
It is few；It is influenced to make chemically treated salinized soil not by lower layer's moisture and salinity, separation layer should be arranged in roadbed bottom；Of the invention
Not only method is simple for construction, but also advantages of nontoxic raw materials, small to environmental hazard, is a kind of safe and efficient gobi Salty Soil Subgrade
Construction.
Specific embodiment
Embodiment:
A kind of gobi roadbed salt marsh chemical treatment construction, comprising the following steps:
A, preparation of construction is carried out, especially pays attention to avoiding rainy season operation as far as possible；
B, plant soil layer will be ploughed below earth's surface to excavate, and turn over 15-25cm still further below, admix calcium chloride or chlorination turning over after layer crushes
Barium；
C, turning over layer paving and leveling and carrying out watering sunning for calcium chloride or barium chloride will be admixed；
D, the water content that Dang Lupu bankets is reduced within the scope of optimum moisture content, and the grey dosage detected all meets design and specification
It is required that when, continuously it is rolled by defined compactness；
E, geotextiles are laid with；
F, sample detection enters subsequent processing if qualified；If unqualified, step C-E is repeated.
In the step A, construction should avoid rainy season operation as far as possible, and should carry out ground waterproof measure, and subgrade construction is horizontal
Slope is not less than 2% to reinforce transverse drainage；It is covered after quickly rolling loose earth filling before rainfall with waterproof cloth, prevents rainwater from impregnating；
Roadbed two sides gutter is unimpeded, guarantees ground and has filled out embankment and do not impregnated.
In the step A, roadbed filling requires segmentation to carry out, and each section of length is 100m-200m.Embankment is applied
Work process will closely be connected, continuous to construct, and segmentation is completed.It should not be spaced too long build road surface after embankment or repaired after overwintering
It builds the road face.
In the step B, 7% or more soil layer of optimum moisture content is higher than for natural moisture content, for " sand " and quickly
Reduction water content first adds 2% calcium chloride in ditch, at least stacks three days stewing ashes, turned once daily, make upper body " sand " simultaneously
It is preliminary to reduce water content.
In the step D, the plain protective soil layer that a layer thickness is no less than 25cm should be covered before winter shut-down, protective layer is wanted
It asks and is rolled by compactness not less than 85%.
Every layer native to roll the time no more than one day.Experience is rolled according to field test section, first rolls two with vibrating roller
Time, the combination compaction technology effect for then grinding the compactness for being continuously rolled by needs with static pressure is preferable.Each construction bid section is because of soil
Matter and rolling apparatus have certain difference, need to obtain the compaction technology of optimization in the construction of the test section before construction.
After Abutment Back, culvert two sides and top, banketing for the structures behind such as slope and retaining wall of cone filled using thin layer, pine
It spreads thickness and is less than 20cm.Due to the limitation of construction space, the earth material at the position should pave on adjacent segments, mix ash, mix and stir
The material diameter for being crushed to and allowing is mixed and stirred with stabilization afterwards, then structure is shifted onto behind with bull-dozer, is rolled after leveling, compactness
Layered weighting, every 50m2 check at 1 point, at least check less than 50m2 at 1 point.From embankment to roadbed compactness evenness not less than 96% control
System.
The following are the main points of the quality of construction of the invention control:
1 original place surface treatment
1.1, which strictly carry out the sunning of clear table to original ground by design requirement, rolls or carries out special specially treated and want up to design or standardize
It asks.
Drainage system around 1.2 dredging roadbeds, in case roadbed impregnates.
When water content within 1.3 former base substratum thickness 1m is more than liquid limit, it is necessary to all change and fill out the strong soil of seepage of water；
When water content circle is between liquid limit and plastic limit, should spread as defined in filling out after the strong coarse-grained soil of seepage of water of 10~30cm and meeting again
Soil.
1.4. it when removing soft soil reaches level of ground water or less, changes and fills out the strong coarse-grained soil of seepage of water, and should be higher by
Level of ground water 30cm or more, then fill out and meet defined soil.
The control of 2 water content
Salty Soil Subgrade filler must control in optimum moisture content ± 1%, should dry if big, small to sprinkle water, and when watering should infuse
Meaning:
The selection of 2.1 water quality: roadbed filling is taken to make soluble salt content test, water sampling makees water analysis test.According to test knot
Fruit spills fresh water when using non-salty-soil as roadbed filling；When using salinized soil as roadbed filling, brine is spilt.
The control of 2.2 watering amounts: watering quantity and mode are controlled depending on filler by optimum moisture content+1%.With spilling
Waterwheel watering, preferably afternoon or evening are sprinkled water, and morning essence is put down, rolled, to reduce the influence of evaporation.Every specific amount of water of linear meter(lin.m.)
It can estimate as the following formula and suitably increase water consumption:
M water=(ω-ω 0+ 1%) α Q/ (1+ ω 0)=(ω-ω 0+1%) α B δ Κ γ 0 (1+ ω 0)
In formula:
ω-natural moisture content (%)
0-optimum moisture content of ω (%)
0-maximum dry density of γ (g/cm3)
The current embankment width (m) of B-
The current embankment thickness (m) of δ-
K-compactness (%);
α-moisture loss coefficient.
Embankment earthwork moisture loss coefficient need to be measured: " moisture loss coefficient " is the concept borrowed, it refers to a cubic metre of earth water
Divide the loss amount within the unit time, it is wet with soil compaction degree, soil property and hydraulic permeability coefficient, evaporation capacity, solar temperature, air
Degree, wind speed etc. have relationship, may be used to determine rolling operation segment length and watering amount etc..Measuring moisture loss coefficient can be in roadbed
During Initial Stage Construction carries out, every to measure average change value of the primary earthwork water content on each vertical section, sunshine temperature every other hour
Degree, air humidity, wind speed etc. rough can be recorded according to weather forecast；Continuous observation seven days, to observation data mathematical statistics side
Method carries out numerical analysis and arranges, can find out the arithmetic mean of instantaneous value A to a certain specific soil property moisture loss coefficient or obtain one
It is a about the time, temperature, humidity, wind speed arithmetic equation expression formula f(x), A or arithmetic equation expression formula f(x is applied in construction)
It calculates the earthwork and mends watering amount size.The roadbed earthwork especially to that need to mend watering point, should comprehensively consider moisture loss and roll
At the required period, watering and rolling operation face length are determined, benefit watering point is made to be utilized effectively.It is primary as far as possible when watering
Foot is spilt, to reduce loss caused by secondary watering.
The control of 3 compactnesss
3.1 detection methods: due to salinized soil soil layer construction in construction with the variation of excavated section and depth, soil property also exists
Variation, compaction just will appear different phenomenons during the filling of roadbed, so that the result of laboratory's standard compaction test
Can not correctly reflect roadbed uses native situation, it is difficult to effective to construction progress to control and correctly instruct.Therefore it is examined in construction
" field sampling compacting process " method should be taken in survey, step: first test indoor standard compaction test determine optimum moisture content,
Maximum dry density, by it is defined hit real frequency carry out Stratified Sampling test, and by different section soil make by 1: 1 mixing as
Sample, is subject to heavy compaction standard, each takes soil point that should do the parallel test not less than two groups, its average value γ 0 is taken to make
For tamp standards, as in work progress control and guiding construction produce, then by test procedure to the roadbed rolled
It is detected, the general paragraph of K=γ actual measurement/γ 0.Test result is evaluated by test engineer and laboratory technician, according to roadbed
The actual conditions of test point determine the paragraph of " outlier ".Again the paragraph of " outlier " is located to sample on the spot at the scene,
Guarantee that its water content carries out compaction test in the case where that can carry out construction rolling, obtain dry density γ 2, using γ 2 as compacting
The maximum dry density that degree evaluation uses, i.e. K exception paragraph=γ actual measurement/γ 2.
When compaction test, villaumite or sulfuric acid filler salt prepare test specimen using water similar in water quality as far as possible, it is possible to reduce accidentally
Difference.When i.e. watering is using brine, reality is hit with brine, otherwise hits reality with fresh water.
If saline soil area soil property is mainly sandy soil and fine grained soil, the compaction quality of roadbed depends primarily on construction technology
It is first pressed to visually observing place with suspicion first with the control of water content for this purpose, should be carried out in two steps when detecting compactness
Solidity measurement, every 100m have the testing result of 10 or more reconnaissances it is undesirable when, should be used as improper works, Bu Nengju
Portion's processing, is rolled again after should tedding or supplementing watering；It can make local place when such as undesirable measuring point less than 10
Reason.Random detection is then carried out, every 2000m 2 is no less than at 8 points.
3.2 degree of compaction standard: to prevent salinity from shifting and guaranteeing that the stabilization of roadbed, the compactness of roadbed preferably suitably mention
It is high.
3.3 compacting construction technologies: being rolled with vibration press, and every 100~150m is a rolling operation face.Rolling it
It is preceding first by shoulder pressure stabilizing one time, then abide by the original of " intermediate behind first edge, first weight after light pressure, is first pressed after slow pressure fastly "
Then, it is rolled by test section achievement pass, accomplishes that rolling is longitudinal parallel, 1/2 wheel of mistake rolls, and guards against the phenomenon that rolling less than side.
4 structure anti-corrosions
The lower part of 4.1 saline soil area cement concrete structures and the top contacted with salt marsh soil, should do anti-corrosion treatment.
Selection special cement is generally taken, increases cement consumption, reduce the ratio of mud, using excellent additive, admixture, increase concrete
Protective layer preferably is arranged on the surface of concrete construction if not being able to satisfy anticorrosive requirement still in the measures such as protective layer thickness.
4.2 in the salinized soil based on villaumite, cement used in reinforced concrete foundation is prepared, using high grade silicate
Cement or mine quarrel estersil salt cement, to prevent the corrosion phase destruction of reinforcing bar；It should be adopted in the salinized soil based on sulfate
With sulfate-resistant cement, to prevent sulfate from acting on physics, the chemical depletion of concrete.
4.3 ready-mixed concretes or mortar water, sand, the pertinent regulations that should be conformed to current standards.When construction to mixing water,
Salt content in sand answers strict control, the chloride ion content when concrete is in salinized soil environment, in concrete mixing water
200mg/L should be not more than, otherwise should add reinforcing steel bar corrosion inhibitor, sulfate meets content and should be not more than based on SO 42-
500mg/L；For the sand of armored concrete, pertinent regulations that chloride ion content should conform to current standards.It is poured in concrete
Reinforce vibrating in the process, to reduce the porosity of concrete, reduces the route of entry of harmful substance.
When 4.4 base concretes use additive, additive should be selected according to the erosion grade of brining ground foundation；Using containing
When villaumite additive, the pertinent regulations of specification and current standard should be met.
4.5 are located at the reinforced concrete construction object of chlorine saline soil, introduce in concrete batching system because of various composition materials
Chloride ion content (equivalent chloride content) should be no more than the 0.06% of cement consumption for prestressed concrete, for commonly mixing
Solidifying soil should be no more than the 0.10% of cement consumption, and the such as larger than above numerical value should take effective rust preventing (such as incorporation resistance rust
Agent, increase protective layer thickness, raising concrete density etc.).
4.6 need to smear the surface of base of the concrete construction of erosion resistant coating, it is necessary to solid smooth, free from flaw and honeycomb fiber crops
Face, surface will be dried, and intensity should meet design requirement, smear height should be higher by the position 0.5m of contact salinized soil or mineralized water~
1.0m.Asphalt corrosion resistant layer preferably divides two layers of construction, with a thickness of 2~5mm.
Soluble salt content under 4.7 pairs of general buildings or structures bases is more than in 0.3%, strong salinized soil is all excavated,
It removes lower layer's salinized soil post-processing approach to determine depending on concrete condition: be backfilling and compacted with non-salty-soil or non-molten sunken property salinized soil；Add
Deep foundation is to salt marsh soil layer bottom；Using low-grade concrete or cement Stability Gravel to basic bottom；Using concrete pier foundation
Rest superstructure.
4.8 lower layer's stain soil bases are the secondary disasters generated due to water to the harm of buildings or structures, if can prevent water
Disaster would not or occur less, so taking the Disaster Prevention Measures of brining ground foundation in conjunction with waterproof measure is relatively effective side
Method must all cause enough attention in design, construction and using each valence section, take various effective measures, make ground
Not by the destruction of water, guarantee the safe and reliable and normal use of buildings or structures.
4.9 structures take concrete structure, the reason is that the hole of grouting engineering is much larger than concrete works, corrosivity
Medium is easier to enter structure.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Anyone skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (4)
1. a kind of gobi roadbed salt marsh is chemically treated construction, which comprises the following steps:
A, preparation of construction is carried out, especially pays attention to avoiding rainy season operation as far as possible；
B, plant soil layer will be ploughed below earth's surface to excavate, and turn over 15-25cm still further below, admix calcium chloride or chlorination turning over after layer crushes
Barium；
C, turning over layer paving and leveling and carrying out watering sunning for calcium chloride or barium chloride will be admixed；
D, the water content that Dang Lupu bankets is reduced within the scope of optimum moisture content, and the grey dosage detected all meets design and specification
It is required that when, continuously it is rolled by defined compactness；
E, geotextiles are laid with；
F, sample detection enters subsequent processing if qualified；If unqualified, step C-E is repeated.
2. roadbed salt marsh in gobi as described in claim 1 is chemically treated construction, which is characterized in that in the step A,
Roadbed filling requires segmentation to carry out, and each section of length is 100m-200m.
3. roadbed salt marsh in gobi as described in claim 1 is chemically treated construction, which is characterized in that in the step B,
7% or more soil layer of optimum moisture content is higher than for natural moisture content, for " sand " and quick reduction water content, first in ditch
Add 2% calcium chloride, at least stack three days stewing ashes, turn daily once, makes upper body " sand " and tentatively reduce water content.
4. roadbed salt marsh in gobi as described in claim 1 is chemically treated construction, which is characterized in that in the step D,
Winter should cover the plain protective soil layer that a layer thickness is no less than 25cm before stopping work, and protective layer requirement is rolled by compactness and is not less than
85%。
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| CN201710444569.0A CN109137692A (en) | 2017-06-13 | 2017-06-13 | A kind of gobi roadbed salt marsh chemical treatment construction |
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| CN201710444569.0A CN109137692A (en) | 2017-06-13 | 2017-06-13 | A kind of gobi roadbed salt marsh chemical treatment construction |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114108407A (en) * | 2021-12-09 | 2022-03-01 | 中铁十局集团第七工程有限公司 | Construction method of strong-alkali saline soil subgrade in plateau cold and arid region |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101024934A (en) * | 2007-03-06 | 2007-08-29 | 天津宝泰建设有限公司 | Construction method for railway and road foundation |
| CN103628375A (en) * | 2012-08-24 | 2014-03-12 | 新疆交通建设（集团）有限责任公司 | Rock salt roadbed construction method |
| CN106701100A (en) * | 2017-01-09 | 2017-05-24 | 中国神华能源股份有限公司 | Saline soil roadbed filler and method for improving roadbed |
-
2017
- 2017-06-13 CN CN201710444569.0A patent/CN109137692A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101024934A (en) * | 2007-03-06 | 2007-08-29 | 天津宝泰建设有限公司 | Construction method for railway and road foundation |
| CN103628375A (en) * | 2012-08-24 | 2014-03-12 | 新疆交通建设（集团）有限责任公司 | Rock salt roadbed construction method |
| CN106701100A (en) * | 2017-01-09 | 2017-05-24 | 中国神华能源股份有限公司 | Saline soil roadbed filler and method for improving roadbed |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114108407A (en) * | 2021-12-09 | 2022-03-01 | 中铁十局集团第七工程有限公司 | Construction method of strong-alkali saline soil subgrade in plateau cold and arid region |
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