CN104514217B - Expansive soil foundation modifying agent and improvement construction method - Google Patents
Expansive soil foundation modifying agent and improvement construction method Download PDFInfo
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- CN104514217B CN104514217B CN201310449185.XA CN201310449185A CN104514217B CN 104514217 B CN104514217 B CN 104514217B CN 201310449185 A CN201310449185 A CN 201310449185A CN 104514217 B CN104514217 B CN 104514217B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0001—Rubbers
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- Environmental & Geological Engineering (AREA)
- Agronomy & Crop Science (AREA)
- Mining & Mineral Resources (AREA)
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- General Engineering & Computer Science (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
Invention of the present invention provides a kind of expansive soil modifier, it stirs by scrap rubber powder and ardealite powder and water the rubber cement formed, scrap rubber powder and ardealite powder mass ratio are 20:80 ~ 30:70, and scrap rubber powder and ardealite powder account for rubber cement gross mass 6 ~ 7% altogether.Beneficial effect of the present invention is: this modifying agent is compared with conventional lime improvement agent, and associating physics, chemical method, improved effect is more excellent, and expansive soil water stability can be made to increase, and ground swell-shrinking deformation significantly reduces, and keeps lasting stability.
Description
Technical field
The present invention relates to technical field of buildings, be specifically related to a kind of expansive soil foundation modifying agent and improvement construction method.
Background technology
Expansive soil is a kind of regional special clay, there is the characteristics such as imbibition, dehydration shrinkage and repeated expansion and shrinkage distortion, the decay of immersion bearing capacity, desiccation crack growth, character extremely unstable, often make building produce the swell-shrinking deformation of uneven vertical or level, cause displacement, cracking, inclination even to destroy.Expansive soil foundation processing method has soil removal and replacement, improvement of soil nature, soaks in advance, and prevents the engineering measures such as foundation soil change of moisture content.Soil replacement method needs dig on a wide area, and cut-fill transition cost is higher, and lime improvement method etc. are confined to road foundation or shallow layer foundation middle expansive soils improved treatment mostly.
Along with Chinese national economy sustained and rapid development, in production, life, create a large amount of solid waste.Such as, junked tire is tire wear, changes the product thrown aside, and increases rapidly at present along with total vehicle is constantly soaring; And ardealite is the industrial waste produced in phosphorus ammonium manufacturing process, China is that big country's (year discharge capacity 800 ~ 12,000,000 tons) discharged by the ardealite of third place in the world.These discarded objects not only take large quantity space, and contaminated environment, destruction ecology, restriction social sustainable development.Along with day by day shortage and the surge of solid waste of natural resources, many countries using solid waste as " regenerated resources " in addition comprehensive development, utilization.Such as, regeneration waste tire produces rubber powder, and associating ardealite waste material stabilized expansive soil ground, then can realize the combination of refuse punishment and engineer applied, meet the actual requirement of environmental protection and sustainable development simultaneously.
Summary of the invention
One of goal of the invention of the present invention is, for the deficiencies in the prior art place, to provide a kind of expansive soil modifier.
The technical solution used in the present invention is:
Expansive soil foundation modifying agent, it is characterized in that it stirs by scrap rubber powder and ardealite powder and water the rubber cement formed, scrap rubber powder and ardealite powder mass ratio are 20:80 ~ 30:70, and scrap rubber powder and ardealite powder account for rubber cement gross mass 6 ~ 7% altogether.
Further, rubber cement consistency range 18 ~ 24s, bleeding rate 1.8 ~ 2%.
Further, described scrap rubber powder diameter 0.83 ± 0.03mm, ardealite powder diameter 0.15 ± 0.05mm.
Further, sulfate dihydrate calcium content 70 ~ 90% in described ardealite powder; Fiber content 3 ± 0.5% in scrap rubber powder; Water is the drinkable water that pH value is more than or equal to 6.
Another goal of the invention of the present invention is to provide a kind of expansive soil foundation to improve construction method, the technical scheme realizing the object of the invention is: expansive soil foundation improvement construction method, comprise the following steps: (1) configuration modifying agent, scrap rubber powder and ardealite powder and water mix and blend are formed rubber cement, scrap rubber powder and ardealite powder mass ratio are 20:80 ~ 30:70, and scrap rubber powder and ardealite powder account for rubber cement gross mass 6 ~ 7% altogether; (2) hole, drill through the some injected holes in netted arrangement, aperture average φ 120 ~ 250mm; (3) slip casting, injects injected hole by modifying agent rubber cement.
Further, in step (1), also comprise step (1-1): leave standstill condensation after completion of stirring, time of setting is 10 ~ 30min.
Further, the injected hole degree of depth is 15 ~ 20m, adjacent injected hole spacing ﹤ 2m, opening diameter 110mm ~ 250mm, whole bore dia 90 ~ 250mm, pore-forming deviation proportion≤1.5%.
Further, grouting pressure 25MPa ~ 30MPa, flow 65 ~ 120L/min.
Further, step (3) grouting sequence is: first outermost layer one is enclosed injected hole and fill successively or in groups or simultaneously, then according to the order slip casting progressively drawn close to center injected hole.
Further, step (3) is completed by high pressure slurry pump, grout outlet diameter 5 ± 1mm, high pressure slurry pump grout outlet stretches into slip casting bottom injected hole and rotates stop 1 ~ 3min back rising edge jet groutinl, is clogged by grouting port closely knit after slip casting completes by cement mortar or fine aggregate.
Beneficial effect of the present invention is mainly manifested in: (1) advanced technology, compared to traditional soil replacement method, without the need to carrying out dig on a wide area.Compared with conventional lime improvement method, this process integration physics, chemical method, improved effect is more excellent, and expansive soil water stability can be made to increase, and ground swell-shrinking deformation significantly reduces, and keeps lasting stability; (2) environmental, without the need to a large amount of borrow earth, soil removal and replacement, large area vegetation can be made to exempt from breaking-up, thus preserve the ecological environment.Realize the cyclic utilization of waste, avoid discarded object large area to pile up and the problem of environmental pollution that causes, create significant society and environmental benefit; (3) remarkable benefit, without the need to borrow earth, soil removal and replacement, accelerates construction speed, has saved cost of transportation.Meanwhile, adopt discarded object to replace the materials such as lime, reduce raw material acquisition cost, and decrease discarded object land seizure, create significant economic and social benefit.
Detailed description of the invention
Following specific embodiment is described in further detail the present invention:
Expansive soil foundation modifying agent, it is characterized in that it stirs by scrap rubber powder and ardealite powder and water the rubber cement formed, scrap rubber powder and ardealite powder mass ratio are 20:80 ~ 30:70, and scrap rubber powder and ardealite powder account for rubber cement gross mass 6 ~ 7% altogether.
Modifying agent of the present invention has physically improved and chemical modifying effect to expansive soil foundation simultaneously simultaneously, physically improved: rubber powder stable in physicochemical property under normal temperature condition, and has the features such as high resiliency, high tenacity and impact resistance.By drilled pressure filling process, waste Crumb rubber and expansive soil group Homogeneous phase mixing.Doping waste Crumb rubber wherein has retardance, suppresses or alleviates the effect of expansive soil swell-shrinking deformation, also can strengthen expansion soil classifiction simultaneously.
In using rubber powder of waste tire also containing have an appointment 3% fiber, fiber has constraint expansive soil group metamorphosis.When group imbibition or dehydration shrinkage, fiber and group interface produce frictional resistance, consume demi-inflation or shrinkage internal force, effectively reduce the Expansion Potential of the soil body, thus the swell-shrinking deformation of reduction expansive soil.
From microcosmic, waste Crumb rubber specific area is larger, and larger with group contacts area, on contact surface, frictional resistance is larger.In addition, fiber has larger surface roughness, increases the interface friction effect of rubber powder and group, thus can the swell-shrinking deformation of effective repression of swelling soil base.
Chemical modifying: the main chemical compositions of ardealite: calcium sulphate dihydrate (CaS042H
20), content generally can reach about 70 ~ 90%.In improved, process, there is following acting in ardealite and expansive soil:
(1) cation exchange effect
Ca in ardealite
2+with the cation (as: Na on soil particle surface
+, K
+, H
+) there is exchange interaction, make the diffusion layer in soil particle surface electric double layer thinning, the Expansion Potential of soil weakens, and particle attracts each other into granule.The dispersiveness of expansive soil, collapse resistant and hydrophily reduction, index of plasticity declines.Expansive soil is easily stablized shaping, and form early strength, engineering properties changes.
(2) gelatification
After ion exchange, in expansive soil, silica gel, aluminium glue and ardealite react further, form the hydrated products such as moisture calcium silicates, calcium aluminate.Issue stiffization in water environment, gel forms the stronger reticular protection film of adhesion stress in soil particle periphery, impels stabilized expansive soil gain in strength and maintains a long-term stability.Meanwhile, diaphragm also can isolate moisture make expansive soil obtain water stability.
(3) carbonation
Ardealite infiltrates after in expansive soil, part also can with CO in air
2there is chemical reaction and generate calcium carbonate (CaCO
3) crystal.And calcium carbonate has higher intensity and water stability, and be a kind of unexpansive mineral, the swell-shrink characteristic reducing expansive soil soil is played a major role.In addition, the cementation of calcium carbonate makes expansive soil form lime stabilized soils, has later strength steady in a long-term.
Further, rubber cement consistency range 18 ~ 24s, bleeding rate 1.8 ~ 2%.
Further, described scrap rubber powder diameter 0.83 ± 0.03mm, ardealite powder diameter 0.15 ± 0.05mm.
Further, sulfate dihydrate calcium content 70 ~ 90% in described ardealite powder; Fiber content 3 ± 0.5% in scrap rubber powder; Water is the drinkable water that pH value is more than or equal to 6.
Another goal of the invention of the present invention is to provide a kind of expansive soil foundation to improve construction method, the technical scheme realizing the object of the invention is: expansive soil foundation improvement construction method, comprise the following steps: (1) configuration modifying agent, scrap rubber powder and ardealite powder and water mix and blend are formed rubber cement, scrap rubber powder and ardealite powder mass ratio are 20:80 ~ 30:70, and scrap rubber powder and ardealite powder account for rubber cement gross mass 6 ~ 7% altogether; (2) hole, drill through the some injected holes in netted arrangement, aperture average φ 120 ~ 250mm; (3) slip casting, injects injected hole by modifying agent rubber cement.
Mixed serum is wanted can be full of expansive soil hole completely equably, therefore pours into mixed serum used and must reach following requirement: 1. dispersed: waste Crumb rubber and ardealite even particulate dispersion form serum in water.2. suspension: waste Crumb rubber and ardealite particle are suspended state and do not sink because of gravity.3. stability: waste Crumb rubber and ardealite particle are in metastable state and laminated segregation phenomenon does not occur.
With reference to mixture proportions recommended and engineering practice or requirement, determine the raw-material coordination in works such as waste Crumb rubber and ardealite.Concrete process for preparation is described as: according to coordination in works requirement, accurately calculates the consumption of waste Crumb rubber, ardealite and water; Electronic measurement method is adopted accurately to control match ratio, with each 0.3m of every platform
3for unit, (mass ratio) weighing raw materials (waste Crumb rubber, ardealite) in proportion; Waste Crumb rubber and ardealite are added to the water, and stir about 5min, make ardealite completely soluble in water, rubber powder is fully spread in water, forms the rubber cement mixed.
Adopt Site method, can controlled material time of setting.Mixture stirs and answers uniform and stable, prevents air from entering generation bubble, thus affects slurries functional performance.Rubber cement desired consistency controls to measure at 18 ~ 24s(slip consistency instrument), to meet pressure grouting requirement.Mixing and stirring rear bleeding rate controls about 2%, and bleeding again all should be absorbed by rubber cement in 24h.For improving modifying agent performance further, in step (1), also comprise step (1-1): leave standstill condensation after completion of stirring, time of setting is 10 ~ 30min, fully to infiltrate expansive soil.Require that slurries do not shrink in process of setting, and do not shrink after setting expansion soil, early strength (24h) can reach more than 1.2MPa.
For effectively reducing expansive soil swell-shrink coefficient, ensure workmanship, the injected hole degree of depth is 15 ~ 20m, adjacent injected hole spacing ﹤ 2m, opening diameter 110mm ~ 250mm, whole bore dia 90 ~ 250mm, pore-forming deviation proportion≤1.5%.
For taking into account slip casting efficiency and operating efficiency, grouting pressure 25MPa ~ 30MPa, flow 65 ~ 120L/min.
Step (3) grouting sequence is: first outermost layer one is enclosed injected hole and fill successively or in groups or simultaneously, then according to the order slip casting progressively drawn close to center injected hole.Make the soil body in the scope of needing reinforcement form one curtain, spread to the periphery to prevent the slurries of follow-up injected hole.
For submitting efficiency of construction to, step (3) is completed by high pressure slurry pump, grout outlet diameter 5 ± 1mm, high pressure slurry pump grout outlet stretches into slip casting bottom injected hole and rotates stop 1 ~ 3min back rising edge jet groutinl, is clogged by grouting port closely knit after slip casting completes by cement mortar or fine aggregate.
Below by way of each optimum configurations in the above-mentioned modifying agent of every verification experimental verification and improvement construction method on the impact of workmanship:
1) glutinous grain analytical test
Carry out grading analysis test to the stabilized expansive soil after mixing and stirring, result is as table 5.2.4-1.As seen from table: after mixing discarded mixture, the clay content of expansive soil obviously reduces, otherwise the granule content that glutinous grain (powder) sandization is formed then increases; When mixing the discarded mixture of about 6%, clay content amount of decrease is maximum.Show thus, after Mixed With Wastes (especially ardealite), Expansive Soils generation grittinessization develops.
Table 1 sticky content contrasts
| Soil sample title | Natural soil sample | 4% | 5% | 6% | 7% | 8% |
| Weak expansive soil | 84 | 76 | 71 | 67 | 69 | 69 |
| Middle expansive soils | 86 | 79 | 74 | 70 | 70 | 72 |
2) liquid-limit & plastic-limit test
Carry out liquid-limit & plastic-limit test to the stabilized expansive soil after mixing and stirring, result of the test is as table 5.2.4-2.As seen from table, increase with discarded mixture volume, the liquid limit of expansive soil reduces, and plastic limit obviously increases, and index of plasticity then significantly reduces.When volume is greater than 6%, the biggest drop of expansive soil index of plasticity, slightly increases trend afterwards.
Table 2 liquid limit, plastic limit and index of plasticity contrast
Note: w in table
l, w
p, I
prepresent liquid limit, plastic limit and index of plasticity respectively.
3) unconfined compression strength test
Carry out unconfined compression strength test to 7d conditioned soil in the length of time, result of the test is as table 5.2.4-3.As seen from table, along with discarded mixture volume increases, unconfined compression strength increases.When incorporation is about 6%, weak expansive soil reaches peak value without side limit intensity; When incorporation is 7%, middle expansive soils reaches peak value without side limit intensity.After incorporation is greater than 6%, gain in strength is slow.
Table 3 unconfined compression strength contrast (unit: kPa)
4) submerging test
Carry out submerging test (soaking 72 hours) to the stabilized expansive soil of maintenance 7d, observed result is as table 5.2.4-4: except having slight disintegration during middle expansive soils 4% volume, all the other are all without obvious disintegration.It can thus be appreciated that discarded mixture volume is greater than 5%, the water stability of stabilized expansive soil is good, and when showing to improve, ardealite mixture volume must not be less than 5% simultaneously.
Table 4 soaks disintegration properties contrast
| Soil sample title | Natural soil sample | 4% | 5% | 6% | 7% | 8% |
| Weak expansive soil | Completely | Nothing | Nothing | Nothing | Nothing | Nothing |
| Middle expansive soils | Completely | Slightly | Nothing | Nothing | Nothing | Nothing |
5) modified compaction test
Carry out modified compaction test to the stabilized expansive soil of maintenance 7d, result of the test is as table 5.2.4-5.As seen from table, maximum dry density is successively decreased rapidly with the volume increase of discarded mixture, and optimum moisture content then slowly increases progressively.When volume is greater than 6%, maximum dry density and optimum moisture content change are slowly.
Table 5 modified compaction test contrasts
Note: ρ in table
dmaxand ω
0represent maximum dry density and optimum moisture content respectively.
6) swell-shrink characteristic test
Stabilized expansive soil is carried out to free wxpansion, expansion force, without load with have load swell increment and shrinkage test, calculates swell-shrink total ratio according to result of the test, and result of calculation is as table 5.2.4-6.As seen from table, weak expansive soil when lime intermingled quantity reaches 6%, swell-shrink total ratio <0.7%; Middle expansive soils when lime intermingled quantity reaches 7%, swell-shrink total ratio <0.7%.
Swell-shrink total ratio with
represent, and be calculated as follows:
.In formula:
: the expansion rate when pressure 0.5MPa;
: the shrinkage factor of soil;
: the natural moisture content of soil;
: the lower limit of soil moisture content in contraction process.
Table 6 swell-shrink total ratio contrasts
| Soil sample title | Natural soil sample | 4% | 5% | 6% | 7% | 8% |
| Weak expansive soil | 6.9 | 0.92 | 0.74 | 0.22 | 0.17 | 0.15 |
| Middle expansive soils | 11.8 | 1.72 | 0.96 | 0.8 | 0.38 | 0.20 |
In a word, along with discarded mixture volume increases, expansive soil physico-mechanical properties occurs obviously to change.1. constituent: in expansive soil, clay content reduces, sand (or powder) grain content increases, and expansive soil engineering properties is equal to cementing sandy soil.2. physical property: the liquid limit of expansive soil reduces, and plastic limit increases, and index of plasticity significantly reduces, immersion disintegration phenomenon fades away, and stabilized expansive soil water stability significantly strengthens.3. mechanical property: expansion potentiality (pressure) significantly reduces, the maximum dry density optimum moisture content that successively decreases then increases progressively, and unconfined compression strength significantly increases.
Analyze above-mentioned test result, propose to recommend proportioning as follows: rubber powder and ardealite account for 6 ~ 7% of gross mass, and the mass ratio of rubber powder and ardealite is generally 20:80 ~ 30:70.Technology properties requires to include: swell-shrink total ratio <0.7%, 7d unconfined compression strength >=0.8MPa, immersion saturated is without disintegration phenomenon.Adopt and recommend proportioning to carry out foundation improvement, can significantly strengthen expansive soil water stability, effectively control ground swell-shrinking deformation.At the scene in work progress, according to expansive soil physical property and breathing control overflow etc., the suitably quality proportioning of adjustment waste Crumb rubber and ardealite.
For meeting foundation improvement requirement and taking into account the quality specifications such as safety, environmental protection, also should as following ancillary method: after building foundation pit excavation, should place be flattened, and carry out construction plant draining, waterproof work, forbid that construction water flows into foundation ditch (groove), forbid construction water pipeline leakage.
First, the measure of draining drainage is carried out.Excavation groove, sump, row dredges the surface water such as rainwater or the surplus water of construction.Establish personal management to safeguard to on-the-spot waterline network and construction water, interim pond, wash stock ground, agitator, lime paste preparation pond or with the more place of water, reliable drainage system should be established apart from more than building 10m.
Secondly, waterproof moist keeping measures is carried out.Apron slope is set at Around Buildings, and horizontal and vertical water barrier is set, prevent surface water from directly infiltrating and reduce the evaporation of soil moisture; Drainage system is set, intentinonally sewer pipe and the leakproof facility having water location; Isolation layer is laid to underground heat distribution pipeline.
In addition, for improving construction quality further, also should control from following three aspects,
1. quality control
Require to carry out coherent detection according to material technology before 1.1 constructions, require to include: using rubber powder of waste tire is 20 orders (particle diameter is about 0.83mm), about containing more than 3% fiber; Ardealite calcium sulphate dihydrate (CaS042H
20) content reaches about 70 ~ 90%, must not use undesirable raw material.
In 1.2 work progresss, strictly according to designing requirement, implement every draining, waterproof measure, strengthen the humid control of Around Buildings, extraneous infiltration condition under cut-out substrate, to ensure the stability of ground, reduction climate change and human activity are on the impact of ground water content to greatest extent.
1.3 inlet well hole position measuring errors must not exceed ± 50mm.In boring procedure, horizontal and vertical allowable variation is ± 10mm.Opening diameter must not be less than 110mm, and whole bore dia must not be less than 90mm, and pore-forming deviation proportion is not more than 1.5%.When changing position, hole for some reason, design side should be obtained and agree to, and position, hole, hole depth (measuring Grouting Pipe length to obtain) will be recorded faithfully.
1.4 according to Site Soil swell-shrinking property, considers building adaptive deformation ability, strictly controls domain of walker with ± 1% for standard, and suitably waste Crumb rubber and ardealite gross mass in proportioning is recommended in adjustment.In strict accordance with coordination in works requirement, adopt electronic measurement method precise raw material (waste Crumb rubber, ardealite).
1.5 adopt quick mortar mixer preparation grouting serous fluid, and after stirring, bleeding rate controls about 2%, and bleeding all should be absorbed by rubber cement in 24h.Rubber cement desired consistency controls to measure at 18 ~ 24s(slip consistency instrument), control time of setting at 10 ~ 30min, to meet high-pressure slip-casting requirement.
Before 1.6 mortar depositing constructions, carry out slip casting experiment and determine reasonable grouting parameter.Mortar depositing construction simultaneously, gathers and returns slurry sample, does the physical mechanics tests such as initial set, final set and early strength.Preliminary understanding grouting soil consolidation effect.
1.7 when spraying hoisting grouting pipe, and dismounting Grouting Pipe speed wants fast, and the lap length up and down re-starting injection should not be less than 0.3m, prevents induration to disconnect.
1.8 in sprayed construction, should often note returning slurry situation in hole.Returning slurry amount, to be less than grouting amount 20% be normal, when exceeding or do not return slurry, answers immediate analysis reason, continues construction after solution to be determined.
In 1.9 work progresss, all working procedures of strict detection, the original record of complete retention test, detection, construction, needs after statistical analysis with arrangement detecting the data obtained, then in order to evaluate every engineering construction quality.
1.10 carry out excavation in 7d after jet groutinl completion detects, and cutting depth is 1.5m ~ 3.0m; Carry out boring after completion 28d to detect, check induration Morphology and structure.Carry out load test, each place amount detection is no less than the 0.5%-1% of sum, and should not be less than 3 points simultaneously.
2. security control
Before 2.1 constructions, reply constructing operation personnel carry out and confide a technological secret and constructing operation safety education.Establish and improve safe leading organ, the division of labor is clear and definite, and everyone has responsibility.
2.2 require each operation, each work point constructs in strict accordance with operational procedure, should get rid of in time the place that there is potential safety hazard, stop any accident and occur.
Must field investigation be carried out before 2.3 commencement of works, according to the landform, geology, the hydrology, meteorology, environment etc. of construction site, formulate corresponding safety technics and environmental protective measure.
2.4 job sites meet security regulations and the construction requirements such as fire prevention, windproof, lightning protection, flood control, protection against electric shock; There are good quarantine measures work zone, and job site safety signs is complete.
2.5 before jet groutinl, checks high-tension apparatus and pipe-line system, comprises slush pump, water pump and high-pressure rubber pipe and safety valve etc.The pressure of equipment and discharge capacity must meet design requirement, and the sealing of pipe-line system must be good, must not have the foreign material such as residue and iron filings in each pipeline and nozzle.
2.6 carry on construction work at night arranges lighting installation and obvious caution notice as required.
During 2.7 rainy day construction, scene should get enough rainproof anti-skidding facilities ready.All electromechanical equipments are provided with rain cover, and power switch special messenger is responsible for.
2.8 equipment, before work, conscientiously check, ensure that equipment performance is good, safe and reliable, after same day end-of-job, and timely inspection and maintenance.When relieving, mutually carefully to join inspection, fill in handover record.
3. environment protection control
Conscientiously implement national relevant environment protection regulation while, also should conscientiously accomplish following some:
3.1 arrange temporary drainage irrigation canals and ditches, so that rationally discharge rainfall runoff washes away the materials such as the sewage of formation or mud.
3.2 work out concrete safeguard procedures, and in rationally punishment construction, pollutant (as spoir, waste gas, sewage, airborne dust, chemical substance and building waste etc.) discharge, conscientiously protects surrounding environment, forbid that pollutant externally discharges.
3.3 adopt low noise environmental protection machinery equipment.When city construction operation, scene should arrange noise level indicator, must not construct daytime more than 70 decibels, and night must not more than 55 decibels.When constructing near village, avoid the larger machinery of noise to carry on construction work at night as far as possible.
In the construction of 3.4 discarded objects (rubber powder and ardealite) mixing, constructor will wear safety goggles and respirator, to protect eyes and respiratory apparatus, prevents dust from encroaching on.Airborne dust concentration should lower than 1mg/m
3country discharge dust limitation.
The overfall of 3.5 construction periods precipitates rear major part after filtration to be recycled, and fraction waste residue is retained in sedimentation basin, after end to be onstructed, digs the spoil area being transported to supervising engineer and specifying with machinery.
3.6 have constructed rear timely removing temporary works and facility and building waste, carry out barricade and vegetative protection, in order to avoid soil erosion to spoil ground.
Although the present invention has illustrated by reference to preferred embodiment and has described, those of ordinary skill in the art should understand, and can be not limited to the description of above-described embodiment, in the scope of claims, can do the various changes in form and details.
Claims (9)
1. expansive soil foundation modifying agent, it is characterized in that it stirs by scrap rubber powder and ardealite powder and water the rubber cement formed, scrap rubber powder and ardealite powder mass ratio are 20:80 ~ 30:70, and scrap rubber powder and ardealite powder account for rubber cement gross mass 6 ~ 7% altogether.
2. expansive soil foundation modifying agent according to claim 1, is characterized in that: described scrap rubber powder diameter 0.83 ± 0.03mm, ardealite powder diameter 0.15 ± 0.05mm.
3. expansive soil foundation modifying agent according to claim 1, is characterized in that: sulfate dihydrate calcium content 70 ~ 90% in described ardealite powder; Fiber content 3 ± 0.5% in scrap rubber powder; Water is the drinkable water that pH value is more than or equal to 6.
4. expansive soil foundation improvement construction method, it is characterized in that comprising the following steps: (1) configuration modifying agent, scrap rubber powder and ardealite powder and water mix and blend are formed rubber cement, scrap rubber powder and ardealite powder mass ratio are 20:80 ~ 30:70, and scrap rubber powder and ardealite powder account for rubber cement gross mass 6 ~ 7% altogether; (2) hole, drill through the some injected holes in netted arrangement, aperture average φ 120 ~ 250mm; (3) slip casting, injects injected hole by modifying agent rubber cement.
5. expansive soil foundation improvement construction method according to claim 4, is characterized in that also comprising step (1-1) in step (1): leave standstill condensation after completion of stirring, time of setting is 10 ~ 30min.
6. expansive soil foundation improvement construction method according to claim 4, is characterized in that: the injected hole degree of depth is 15 ~ 20m, adjacent injected hole spacing ﹤ 2m, opening diameter 110mm ~ 250mm, whole bore dia 90 ~ 250mm, pore-forming deviation proportion≤1.5%.
7. expansive soil foundation improvement construction method according to claim 4, is characterized in that: grouting pressure 25MPa ~ 30MPa, flow 65 ~ 120L/min.
8. expansive soil foundation improvement construction method according to claim 4, is characterized in that step (3) grouting sequence is: first outermost layer one is enclosed injected hole and fill successively or in groups or simultaneously, then according to the order slip casting progressively drawn close to center injected hole.
9. expansive soil foundation improvement construction method according to claim 4, it is characterized in that step (3) is completed by high pressure slurry pump, grout outlet diameter 5 ± 1mm, high pressure slurry pump grout outlet stretches into slip casting bottom injected hole and rotates stop 1 ~ 3min back rising edge jet groutinl, is clogged by grouting port closely knit after slip casting completes by cement mortar or fine aggregate.
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| CN105887801A (en) * | 2016-05-16 | 2016-08-24 | 浙江工业大学 | Method for improving expansive soil foundation through ardealite and waste tire rubber powder |
| CN113880537A (en) * | 2021-09-30 | 2022-01-04 | 合肥工业大学 | Preparation method of titanium gypsum simple modified improved expansive soil roadbed filler |
| CN115058083A (en) * | 2022-07-21 | 2022-09-16 | 河北工业大学 | Geotechnical material based on waste COVID-19 mask and preparation method and application thereof |
| CN116950139A (en) * | 2023-07-31 | 2023-10-27 | 重庆诺为生态环境工程有限公司 | Stable framework compact structure, impermeable composite material, impermeable layer and preparation method and application thereof |
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| CN1850702A (en) * | 2006-05-12 | 2006-10-25 | 河海大学 | Hexadecyl trimethyl ammonium bromide expansive soil improvement agent |
| CN101063036A (en) * | 2006-11-20 | 2007-10-31 | 中国科学院地质与地球物理研究所 | Chemical modifying method for swelled ground treatment |
| CN101413260A (en) * | 2008-11-19 | 2009-04-22 | 河海大学 | Method for improving swelled ground by waste tire glue powder |
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