CN116253495A - Rapid solidification method of high-water-content river channel excavation dredging soil - Google Patents
Rapid solidification method of high-water-content river channel excavation dredging soil Download PDFInfo
- Publication number
- CN116253495A CN116253495A CN202211630156.9A CN202211630156A CN116253495A CN 116253495 A CN116253495 A CN 116253495A CN 202211630156 A CN202211630156 A CN 202211630156A CN 116253495 A CN116253495 A CN 116253495A
- Authority
- CN
- China
- Prior art keywords
- soil
- content
- rapid solidification
- river channel
- solidification method
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000002689 soil Substances 0.000 title claims abstract description 70
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000007712 rapid solidification Methods 0.000 title claims abstract description 16
- 238000009412 basement excavation Methods 0.000 title claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 27
- 238000005189 flocculation Methods 0.000 claims abstract description 23
- 230000016615 flocculation Effects 0.000 claims abstract description 23
- 239000007787 solid Substances 0.000 claims abstract description 15
- 239000002002 slurry Substances 0.000 claims abstract description 14
- 239000000945 filler Substances 0.000 claims abstract description 11
- 238000001914 filtration Methods 0.000 claims abstract description 11
- 239000000126 substance Substances 0.000 claims abstract description 11
- 239000003513 alkali Substances 0.000 claims abstract description 10
- 238000002156 mixing Methods 0.000 claims abstract description 10
- 230000018044 dehydration Effects 0.000 claims abstract description 8
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 8
- 239000011259 mixed solution Substances 0.000 claims abstract description 8
- 229920002401 polyacrylamide Polymers 0.000 claims abstract description 8
- RUTXIHLAWFEWGM-UHFFFAOYSA-H iron(3+) sulfate Chemical compound [Fe+3].[Fe+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O RUTXIHLAWFEWGM-UHFFFAOYSA-H 0.000 claims abstract description 6
- 229910000360 iron(III) sulfate Inorganic materials 0.000 claims abstract description 6
- 238000011049 filling Methods 0.000 claims abstract description 5
- 239000000843 powder Substances 0.000 claims description 22
- 238000001723 curing Methods 0.000 claims description 21
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 20
- 239000002893 slag Substances 0.000 claims description 18
- 229910000831 Steel Inorganic materials 0.000 claims description 13
- 239000010959 steel Substances 0.000 claims description 13
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 12
- 239000011707 mineral Substances 0.000 claims description 12
- 235000010755 mineral Nutrition 0.000 claims description 12
- 239000004115 Sodium Silicate Substances 0.000 claims description 10
- 239000000292 calcium oxide Substances 0.000 claims description 10
- 235000012255 calcium oxide Nutrition 0.000 claims description 10
- 238000001556 precipitation Methods 0.000 claims description 10
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 10
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 10
- 239000003795 chemical substances by application Substances 0.000 claims description 9
- 230000035939 shock Effects 0.000 claims description 7
- 239000000243 solution Substances 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 5
- 238000012423 maintenance Methods 0.000 claims description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical class C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 4
- 230000006641 stabilisation Effects 0.000 claims description 4
- 238000011105 stabilization Methods 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 3
- 238000003860 storage Methods 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 2
- 230000008901 benefit Effects 0.000 abstract description 5
- 238000007711 solidification Methods 0.000 abstract description 5
- 230000008023 solidification Effects 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 4
- 238000010276 construction Methods 0.000 abstract description 3
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 230000000087 stabilizing effect Effects 0.000 abstract 1
- 239000004568 cement Substances 0.000 description 8
- 238000012360 testing method Methods 0.000 description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 7
- 208000005156 Dehydration Diseases 0.000 description 5
- 238000003912 environmental pollution Methods 0.000 description 5
- 238000003825 pressing Methods 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 4
- 238000004064 recycling Methods 0.000 description 4
- 239000012190 activator Substances 0.000 description 3
- 239000012065 filter cake Substances 0.000 description 3
- 239000008394 flocculating agent Substances 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 2
- 229910021578 Iron(III) chloride Inorganic materials 0.000 description 2
- 235000011941 Tilia x europaea Nutrition 0.000 description 2
- 230000004913 activation Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 239000010881 fly ash Substances 0.000 description 2
- 239000012456 homogeneous solution Substances 0.000 description 2
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 2
- 239000004571 lime Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000007480 spreading Effects 0.000 description 2
- 238000003892 spreading Methods 0.000 description 2
- KEZYHIPQRGTUDU-UHFFFAOYSA-N 2-[dithiocarboxy(methyl)amino]acetic acid Chemical compound SC(=S)N(C)CC(O)=O KEZYHIPQRGTUDU-UHFFFAOYSA-N 0.000 description 1
- BFSVOASYOCHEOV-UHFFFAOYSA-N 2-diethylaminoethanol Chemical compound CCN(CC)CCO BFSVOASYOCHEOV-UHFFFAOYSA-N 0.000 description 1
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 description 1
- 239000005062 Polybutadiene Substances 0.000 description 1
- 239000006087 Silane Coupling Agent Substances 0.000 description 1
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000001112 coagulating effect Effects 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- YDEXUEFDPVHGHE-GGMCWBHBSA-L disodium;(2r)-3-(2-hydroxy-3-methoxyphenyl)-2-[2-methoxy-4-(3-sulfonatopropyl)phenoxy]propane-1-sulfonate Chemical compound [Na+].[Na+].COC1=CC=CC(C[C@H](CS([O-])(=O)=O)OC=2C(=CC(CCCS([O-])(=O)=O)=CC=2)OC)=C1O YDEXUEFDPVHGHE-GGMCWBHBSA-L 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003623 enhancer Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000012770 industrial material Substances 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 229920005610 lignin Polymers 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- 229920002857 polybutadiene Polymers 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 229920001285 xanthan gum Polymers 0.000 description 1
- 229940082509 xanthan gum Drugs 0.000 description 1
- 235000010493 xanthan gum Nutrition 0.000 description 1
- 239000000230 xanthan gum Substances 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
- C02F11/148—Combined use of inorganic and organic substances, being added in the same treatment step
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/008—Sludge treatment by fixation or solidification
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention discloses a rapid solidification method of high-water-content river channel excavation dredging soil. The rapid solidification method is that the dredging soil with high water content is subjected to chemical pretreatment, mechanical press filtration and dehydration, and inorganic gel is stabilized to form regenerated engineering filler with excellent performance, and then the regenerated engineering filler is used for engineering construction. Wherein, the chemical pretreatment adopts the mixed solution of polyaluminum ferric sulfate chloride with the concentration of 1-2wt% and amphoteric polyacrylamide with the concentration of 1-3 wt% > according to the mass ratio of 2:1 for flocculation; dewatering and intercepting the slurry by using an automatic deslagging filter to form a semi-solid or solid mud cake; and finally, stabilizing by alkali-activated gel, fully mixing, and then filling and maintaining by engineering to form the final stabilized soil. The rapid solidification method can enable the soil body strength to reach more than 100kPa within 24 hours by the high-water-content river channel excavation dredging soil, and has the advantages of obvious solidification effect, economic resources and high environmental friendliness.
Description
Technical Field
The invention mainly relates to the technical field of engineering spoil solidification and recycling, in particular to a rapid solidification method of high-water-content river channel excavation dredging soil.
Technical Field
Dredging of existing channels in rivers, lakes, seas usually produces a large amount of high water content mud, i.e. dredged soil. Because the method has the advantages of high water content, high compressibility and low bearing capacity, can not be directly used for engineering construction, and meanwhile, even for dredged soil with relatively low water content, the method adopts the modes of piling and drying, chemical stabilization (inorganic materials such as cement, lime and fly ash are stable) and biological solidification which are commonly used for curing soft soil to carry out regeneration treatment, the method also has the defects of large dosage, high cost, dry shrinkage, thermal shrinkage and the like of finished products, and industrial products such as cement, quicklime and the like are high-energy-consumption high-carbon emission products, are unfavorable for resource conservation and environmental protection, so that more dredged soil can only be mainly piled and disposed in practice, not only occupies a large amount of land, has long consolidation period and also has environmental pollution risk. Searching a new resource environment-friendly curing method, realizing the recycling of a large amount of engineering of the dredged soil with high water content, and becoming the direction of new technology development in the field of dredging engineering. On the premise of meeting the requirement of engineering utilization performance, the key of saving engineering cost and reducing environmental pollution risk is how to effectively reduce the curing time of dredged soil and the consumption of curing agent.
However, to date, the related efforts have been very limited. The novel high-strength dredging soil curing agent disclosed by application number 201811300758.1 comprises the following components: 6-12 parts of cement, 8-14 parts of mineral powder, 0.05-0.1 part of adhesive, 0.02-0.1 part of additive, 0.05-0.1 part of silane coupling agent, 0.1-0.15 part of hydroxyl-terminated liquid polybutadiene, 0.1-0.15 part of diethylaminoethanol and 0.01-0.05 part of fiber balls; the soft soil curing enhancer disclosed by application number 201610367011.2 comprises the following components: lime 20-30%, cement 65-80%, and enhanced activation activator 1-12.5%, wherein the enhanced activation activator comprises lignin 97%, sodium lignin sulfonate 1.75%, sodium sulfate 0.45-0.95%, acrylamide 1.5-3%, sodium silicate 12-15.5% and sodium metasilicate pentahydrate 70-73%. The main agents of the patents are cement, which is unfavorable for resource conservation, energy conservation and carbon reduction. The modified material for improving the foundation strength of the soft soil disclosed by the application number 202111480388.6 comprises 65-85 parts by weight of the soft soil, 13-14.2 parts by weight of fly ash, 10.4-12.4 parts by weight of alkali activator solution and 0.1-0.3 part by weight of xanthan gum modifier, wherein the patent is limited in that the alkalinity is too high, so that soil body alkalization is easy to occur, and the problem of environmental pollution is solved; the method for curing the high-water-content slurry disclosed in the application number 202110846500.7 is to sequentially perform flocculation treatment and curing treatment on the high-water-content slurry, but the limitation of the patent is that the variety of the used industrial materials is large and the cost is high; the high-efficiency curing method for the high-water-content soft soil site disclosed in the application number 201910160700.X is characterized in that pre-pressing drainage is performed in a vacuum pre-pressing mode and the like, and then secondary repairing and reinforcing are performed through high-pressure grouting, but the limitation of the method is that the pre-pressing dehydration effect is poor, and the curing period is overlong.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a rapid solidification method of high-water-content river channel excavation dredging soil, solves the problems that the current high-water-content river channel excavation dredging soil is piled up to occupy the land and cannot be directly utilized, is suitable for solidification of high-water-content weak soil and on-site recycling of engineering, can effectively save engineering cost, reduce environmental pollution and has remarkable social and economic benefits.
In order to solve the problems in the prior art, the invention adopts the following technical scheme:
a rapid solidification method of high-water-content river channel excavation dredging soil is characterized in that the high-water-content dredging soil is subjected to chemical pretreatment and mechanical press filtration to realize rapid dehydration, inorganic gel is stabilized to form regenerated engineering filler with excellent performance, and finally stable soil is formed through maintenance.
As an improvement, the specific steps of the chemical pretreatment are as follows: preparing flocculation mixed solution by using polyaluminum ferric sulfate chloride with the concentration of 1-2wt% and amphoteric polyacrylamide solution with the concentration of 1-3 wt%according to the mass ratio of 2:1, adding 3-5wt% of the flocculation mixed solution in the high-water-content dredged soil to perform chemical flocculation precipitation treatment, and standing for 30-40min after full stirring to obtain the initial high-water-content slurry.
As an improvement, the specific steps of the mechanical press filtration dehydration are as follows: the slurry with high water content is filtered by an automatic slag discharging filter to be changed into semi-solid or solid mud cake, the water content is not more than 35%, and the filtering precision is 0.2-100 mu m.
As an improvement, the inorganic gel stabilization is to blend 10-20wt% of alkali shock gel accounting for the dredged soil with high water content into semi-solid state or solid mud cake, and the specific steps are as follows: uniformly spreading 2-3cm thick curing agent on a mud cake storage yard, deep turning by a turning machine until the dosage difference of the curing agent is small after multi-point sampling, and not turning again, thereby forming a filler which can be reused in engineering, and finally, using the filler in engineering filling, and curing to form stabilized soil.
The alkali shock gel is further improved by mixing steel slag powder, mineral powder, quicklime, sodium silicate and hydroxylated graphene oxide powder, wherein the corresponding mass mixing ratio is 27-36wt%, 13-18wt%, 13-16wt%, 27-30wt% and 0.03-0.06%o, and the particle sizes of the steel slag powder, the mineral powder, the quicklime, the sodium silicate and the hydroxylated graphene oxide powder are all smaller than 200 meshes.
Further improved is that the curing temperature is 20+/-3 ℃ and the relative humidity is 95%.
Advantageous effects
Compared with the prior art, the rapid solidification method of the high-water-content river channel excavation dredging soil has the following advantages:
(1) The high-value green low-carbon recycling of industrial solid wastes (steel slag and slag) can be realized;
(2) Cement is avoided, the cost is reduced, the carbon emission is reduced, and the resource conservation, economy and environmental protection are facilitated;
(3) The high-moisture-content dredged soil is efficiently solidified, a new filler supply way can be provided for engineering, and meanwhile, the solidification time of the high-moisture-content dredged soil can be effectively shortened, so that the implementation progress of the engineering is accelerated;
(4) The implementation method is simple and feasible, saves land, can effectively save engineering cost, reduces environmental pollution, and has remarkable social and economic benefits.
Drawings
FIG. 1 is a flow chart of a method for rapid solidification of high water cut river channel excavated dredged soil;
FIG. 2 is a graph showing the flocculation precipitation treatment time for different flocculants to complete;
FIG. 3 shows the change in the strength of the solidified soil at different temperatures.
Detailed description of the preferred embodiments
The following describes specific embodiments of the present invention in detail. It should be understood that the detailed description and specific examples, while indicating and illustrating the invention, are not intended to limit the invention.
The implementation steps comprise:
1. preparing flocculation mixed solution with the mass ratio of 2:1 and the concentration of 1-2wt% by using polyaluminium ferric chloride sulfate and amphoteric polyacrylamide, mixing the flocculation mixed solution into the high-water-content dredged soil according to the proportion of 3-5wt% of the high-water-content dredged soil for chemical flocculation precipitation treatment, and standing for 30-40min after full stirring to obtain initial high-water-content slurry;
2. filtering the initial high water content slurry by using an automatic deslagging filter to change the slurry into a semisolid or solid mud cake with the water content not more than 35%, wherein the filtering precision is in the range of 0.2-100 mu m;
3. preparing alkali shock gel by using steel slag powder, mineral powder, quicklime, sodium silicate and hydroxylated graphene oxide, uniformly spreading the alkali shock gel on the surface of a semisolid or solid mud cake of a storage yard, and deeply turning by using a rooter until the dosage difference of a curing agent is very small after multi-point sampling, so that a filler capable of being reused in engineering is formed;
4. and (3) using the formed dredging soil regenerated filler for engineering filling, and carrying out standard maintenance to a specified age to form stabilized soil.
Example 1
Firstly, carrying out flocculation precipitation treatment on high-water-content dredged soil, taking 500g of high-water-content dredged soil, respectively using polyaluminium ferric sulfate chloride, amphoteric polyacrylamide, polyaluminium ferric sulfate chloride and amphoteric polyacrylamide (the mass ratio is 2:1) to prepare flocculation solutions with the concentration of 2wt%, mixing the flocculation solutions into the high-water-content dredged soil according to the proportion of 3-5wt% of the high-water-content dredged soil for chemical flocculation precipitation treatment, standing after full stirring, observing the time required for forming the initial high-water-content slurry, carrying out experiments according to the scheme of a table 1,
TABLE 1 flocculation precipitation protocol and results
FIG. 2 shows the results of flocculation precipitation time for different flocculants, and it can be seen from the figure that the time required for flocculation treatment of the flocculation mixed solution of polyaluminum ferric chloride sulfate and amphoteric polyacrylamide is the shortest when the same high water content dredged soil is treated by adopting the same concentration and doping amount of the flocculants.
Therefore, the flocculation solution with the concentration of 2wt% prepared by adopting polyaluminum ferric sulfate chloride and amphoteric polyacrylamide (the mass ratio is 2:1) has the best flocculation precipitation treatment effect.
500kg of high water content slurry after the coagulating sedimentation treatment is taken, and is subjected to mechanical filter pressing dehydration by using an automatic slag discharging filter. With the increase of the filtering time, the solid impurities trapped on the filter screen are more and more, so that the thickness of the filter cake is continuously increased, the filtering resistance is increased, the pressure in the tank is increased, slag discharge is needed when the pressure is increased to a certain value, the input of filtrate into the tank is stopped, then the steam is introduced to blow the filter cake, and the thickness of the filter cake is controlled to be 2-3cm, so that the semi-solid or solid mud cake with the water content of not more than 35% can be obtained.
Engineering practice shows that the cement (serving as a curing agent) in the cement soil is 7-15% in the common case.
For conservation, the total mixing amount of the alkali-activated gel material in the dredged soil is fixed to be 15 percent (the mass of the dredged soil with relatively high water content), and steel slag powder, mineral powder, quicklime, sodium silicate and hydroxylated graphene oxide are arranged according to the scheme of the table 2. And preparing dredged soil solidified cylindrical samples with different water contents, and carrying out a 7d unconfined compressive strength test.
The preparation method of the steel slag mineral powder solidified dredged soil sample with high water content specifically comprises the following steps:
the method comprises the steps of taking dredged soil after flocculation precipitation and mechanical filter pressing dehydration treatment, determining the consumption of steel slag, mineral powder, quicklime, sodium silicate and hydroxylated graphene oxide under corresponding working conditions according to a test scheme, uniformly mixing the dredged soil, steel slag powder, mineral powder, quicklime and sodium silicate, simultaneously putting hydroxylated graphene oxide into water to be mixed to form a homogeneous solution, adding the homogeneous solution into the mixture of the dredged soil, the steel slag, the mineral powder and the like, stirring to obtain uniform slurry, filling the slurry into a saturator for multiple times, and exhausting and compacting by adopting a vibration mode; curing for 24 hours at the temperature of 20+/-3 ℃ and the relative humidity of 95%, demolding, and curing again in the same curing environment to the specified age. Sample preparation is completed by a triaxial saturator with the diameter of 39.1mm multiplied by 80mm, and the sample preparation is controlled to be molded within 20 minutes, and at least 3 parallel samples are formed under each working condition.
The temperature directly influences the development of soil body intensity, in order to explore the law that the intensity of solidified dredging soil is influenced by curing temperature, the total mixing amount of alkali shock gel in the fixed dredging soil is 15%, steel slag powder, mineral powder, quicklime and sodium silicate are all arranged according to the scheme of a table 2, a cylindrical sample is prepared according to the mixing amount of hydroxylated graphene oxide of 0.05 per mill, and a 7d unconfined compressive strength test is carried out.
Table 2 temperature test protocol
During testing, an electronic universal testing machine is adopted to carry out axial loading at a constant speed of 1mm/min until a sample is destroyed, the testing is stopped manually, and test data are stored.
As shown in FIG. 3, the compressive strength of the solidified dredged soil is improved almost linearly along with the temperature rise, and the 7d uniaxial compressive strength of the solidified dredged soil reaches 158.24kPa and 299.49kPa at the temperature of 20 ℃ and 40 ℃, which shows that the temperature is obvious in improving the strength of the solidified dredged soil with high water content of the steel slag powder ore powder. Therefore, the temperature of the dredging soil in engineering construction can be properly increased in order to shorten the hardening time of the dredging soil.
Claims (6)
1. A rapid solidification method of high-water-content river channel excavation dredging soil is characterized in that the high-water-content dredging soil is subjected to chemical pretreatment, mechanical press filtration dehydration and inorganic gel stabilization to form regenerated engineering filler with excellent performance, and finally stable soil is formed through maintenance.
2. The rapid solidification method of high water content river channel excavation dredging soil according to claim 1, wherein the specific steps of the chemical pretreatment are as follows: preparing flocculation mixed solution by using polyaluminum ferric sulfate chloride with the concentration of 1-2wt% and amphoteric polyacrylamide solution with the concentration of 1-3 wt%according to the mass ratio of 2:1, adding 3-5wt% of the flocculation mixed solution in the high-water-content dredged soil to perform chemical flocculation precipitation treatment, and standing for 30-40min after full stirring to obtain the initial high-water-content slurry.
3. The rapid solidification method of high water content river channel excavation dredging soil according to claim 1, wherein the specific steps of mechanical press filtration dehydration are as follows: the slurry with high water content is filtered by an automatic slag discharging filter to be changed into semi-solid or solid mud cake, the water content is not more than 35%, and the filtering precision is 0.2-100 mu m.
4. The rapid solidification method of high water content river channel dredging soil according to claim 1, wherein the inorganic gel stabilization is to mix 10-20wt% alkali shock gel of high water content dredging soil into semi-solid or solid mud cake, specifically comprises the steps of firstly manually paving 2-3cm thick solidifying agent in mud cake storage field, then deeply turning by means of a rooter until the dosage difference of the solidifying agent is small after multi-point sampling, and then not turning again, thereby forming filler capable of being reused in engineering, finally, using the filler for engineering filling, and forming stabilized soil after maintenance.
5. The rapid solidification method of high water content river channel excavation dredging soil according to claim 4, wherein the alkali shock gel is formed by mixing steel slag powder, mineral powder, quicklime, sodium silicate and hydroxylated graphene oxide powder, and the corresponding mass doping ratio is 27-36wt%, 13-18wt%, 13-16wt%, 27-30wt% and 0.03-0.06%o, and the particle size of the steel slag powder, mineral powder, quicklime, sodium silicate and hydroxylated graphene oxide powder is smaller than 200 meshes.
6. The rapid solidification method for high water content river channel excavation dredging soil according to claim 4, wherein the curing temperature is 20+/-3 ℃ and the relative humidity is 95%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211630156.9A CN116253495A (en) | 2022-12-13 | 2022-12-13 | Rapid solidification method of high-water-content river channel excavation dredging soil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211630156.9A CN116253495A (en) | 2022-12-13 | 2022-12-13 | Rapid solidification method of high-water-content river channel excavation dredging soil |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116253495A true CN116253495A (en) | 2023-06-13 |
Family
ID=86680073
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211630156.9A Pending CN116253495A (en) | 2022-12-13 | 2022-12-13 | Rapid solidification method of high-water-content river channel excavation dredging soil |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116253495A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117285230A (en) * | 2023-10-30 | 2023-12-26 | 中交四航工程研究院有限公司 | Device for pneumatic mixed flow solidification of dredged soil and slurry preparation method |
-
2022
- 2022-12-13 CN CN202211630156.9A patent/CN116253495A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117285230A (en) * | 2023-10-30 | 2023-12-26 | 中交四航工程研究院有限公司 | Device for pneumatic mixed flow solidification of dredged soil and slurry preparation method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Lang et al. | Effectiveness of waste steel slag powder on the strength development and associated micro-mechanisms of cement-stabilized dredged sludge | |
| EP4129949A1 (en) | Unfired construction material using original state shielding soil and preparation method therefor | |
| CN101602567B (en) | Waste mud solidification processing method based on polypropylene acetamide | |
| CN110593036A (en) | Method for preparing roadbed filler by utilizing high-water-content engineering waste soil | |
| CN106904916B (en) | One kind filling out extra large cofferdam mold bag curing soil and its preparation method and application method | |
| CN111995339A (en) | Anti-scouring solidified soil for ocean platform and preparation method thereof | |
| CN107445547A (en) | A kind of high-performance mud agent for fixing and preparation method thereof | |
| CN105622023A (en) | Silt curing agent using furnace slags | |
| CN116253495A (en) | Rapid solidification method of high-water-content river channel excavation dredging soil | |
| CN106082926A (en) | A kind of inorganic polymer sludge solidification mortar and preparation method thereof | |
| CN102503295B (en) | Non-sintered brick prepared from river and lake silt and preparation process thereof | |
| Jiang et al. | Stabilization of iron ore tailing with low-carbon lime/carbide slag-activated ground granulated blast-furnace slag and coal fly ash | |
| CN116143485A (en) | Multi-source excitation solid waste-based sludge curing agent and preparation method thereof | |
| Chen et al. | Fatigue characteristics of nano-SiO2 cemented soil under coupled effects of dry-wet cycle and seawater corrosion | |
| Ding-Bao et al. | Recycling dredged mud slurry using vacuum-solidification combined method with sustainable alkali-activated binder | |
| CN111170663A (en) | Sea mud curing agent | |
| CN111333286B (en) | Method for treating high-water-content sludge in storage yard | |
| CN111606541A (en) | Method for synchronously improving and dewatering sludge excavated in urban rail transit engineering | |
| CN102557536A (en) | Curing agent for littoral-facy soft soil | |
| CN116143468B (en) | Premixed fluid state solidified salty soil and preparation method thereof | |
| CN116947406A (en) | Composite slurry for stirring pile foundation reinforcement engineering | |
| Mastoi et al. | Preliminary investigation of high-water content dredged sediment treated with chemical-physical combined method at low cement content | |
| CN105622022A (en) | Silt curing agent prepared from caustic sludge | |
| CN102260062A (en) | Solidifying agent for stabilizing shallow shifting sand soil | |
| CN110228924A (en) | Riverway sludge inorganic agent |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |