CN115401790A - Construction method of premixed fluidized solidified soil - Google Patents

Construction method of premixed fluidized solidified soil Download PDF

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Publication number
CN115401790A
CN115401790A CN202211217888.5A CN202211217888A CN115401790A CN 115401790 A CN115401790 A CN 115401790A CN 202211217888 A CN202211217888 A CN 202211217888A CN 115401790 A CN115401790 A CN 115401790A
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soil
curing agent
mixing
solidified soil
water
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王玉泽
徐巍
赵志宇
张玉磊
张国旭
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China Construction First Group Corp Ltd
China Construction First Bureau Group North China Construction Co Ltd
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China Construction First Group Corp Ltd
China Construction First Bureau Group North China Construction Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
    • B28C5/003—Methods for mixing
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
    • 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
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
    • C04B2111/00732—Uses not provided for elsewhere in C04B2111/00 for soil stabilisation
    • 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

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Structural Engineering (AREA)
  • Ceramic Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Agronomy & Crop Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Soil Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)

Abstract

The invention relates to a construction method of premixed fluid solidified soil, which specifically comprises the following steps: s1: selecting soil materials; s2: selecting a curing agent; s3: testing the proportion of the solidified soil; s4: stirring the premixed fluid solidified soil; s5: backfilling solidified soil layer by layer; s6: and (5) maintaining. The invention can ensure the quality of the solidified soil finished product and improve the construction efficiency.

Description

Construction method of premixed fluidized solidified soil
Technical Field
The invention relates to the field of premixed fluidized solidified soil, in particular to a construction method of premixed fluidized solidified soil.
Background
The premixed fluid-state solidified soil is equivalent to generalized concrete, the concrete is solidified coarse-grained soil (aggregate such as sand, gravel and the like) by using a cementing material taking cement as a main component, and the premixed fluid-state solidified soil is solidified fine-grained soil (mucky soil, silt, clay, weathered rock particles and the like) by using a high-efficiency rock-soil solidifying agent. According to the construction design requirements, solidified soil with different strength grades can be designed; the method can effectively fill the blank of the premixed concrete in ultralow strength, has better fluidity than the concrete, does not need vibration in construction, can effectively reduce the cost and quickly finish the construction. However, the main materials are various soil bodies, which is not beneficial to ensuring the quality of the solidified soil finished product.
Disclosure of Invention
The invention aims to provide a construction method of premixed fluid solidified soil, which can ensure the quality of a solidified soil finished product and improve the construction efficiency.
In order to achieve the purpose, the construction method of the premixed fluid solidified soil specifically comprises the following steps:
s1: selecting soil materials;
s2: selecting a curing agent;
s3: testing the proportion of the solidified soil;
s4: stirring the premixed fluid solidified soil;
s5: backfilling solidified soil layer by layer;
s6: and (5) maintaining.
As a further improvement of the construction method of the premixed fluid solidified soil, in S1:
firstly, clay, silty clay and sandy silt are adopted, the content of organic matters is not more than 5 percent, the particle size is not more than 50mm, and untreated polluted soil cannot be used as a raw material of solidified soil.
As a further improvement of the construction method of the premixed fluid solidified soil, in S2:
adopts CaO and SiO 2 And Al 2 O 3 The inorganic hydraulic cementing material as the main component is used as a soil curing agent, and the concrete technical standard of the finished curing agent is as follows:
fineness: the sieve allowance of the 80 mu m square hole sieve is less than or equal to 10 percent;
the water content is less than or equal to 1 percent;
during construction, the fluidity of the solidified soil paste in a mixing state is not less than 100mm initially, not less than 90mm when 30min, not less than 80mm when 60min and not less than 45min during initial setting;
or when the pouring time is not more than 1h after stirring, the net slurry fluidity is not required.
As a further improvement of the construction method of the premixed fluid solidified soil, in S3:
s3.1: firstly, preliminarily determining the content of a curing agent and the water-cement ratio of the curing agent, and performing trial preparation;
s3.2: determining the lower limit value of the soil mass for trial preparation, calculating the mass of the mixed curing agent according to the selected reference value of the mixing ratio of the curing agent, wherein the mass of the mixed curing agent is calculated according to the formula (1):
Figure BDA0003873776280000021
in the formula: m is a unit of 0 The mass of the soil material for construction, unit: kg;
m c mass kg of curing agent, unit: kg;
w 0 the water content of the test soil material, unit: percent;
s3.3: according to the water-cement ratio of the selected curing agent slurry, the water addition amount is calculated according to the formula (2):
Figure BDA0003873776280000022
in the formula:
m w mass of water, unit: kg;
mu-water-cement ratio of curing agent slurry;
s3.4: according to the mass m of the soil 0 Calculating the mass of the obtained curing agent and the mass of water, and determining the calculated mixing proportion of the premixed fluid state curing soil;
s3.5: the mixing proportion test is carried out on the basis of calculating the mixing proportion, and the use amount of various materials in the mixing proportion is adjusted and calculated through trial mixing until the performance of the solidified soil meets the design and construction requirements;
s3.6: at least three mixing ratios are adopted for testing, when 3 mixing ratios are adopted for testing, 1 mixing ratio is calculated according to the standard, and the use amount of the curing agent is adjusted on the basis of the calculated mixing ratios by 2 mixing ratios, wherein the use amount of the curing agent is respectively increased and decreased by 3-5%;
s3.7: at least one group of standard test pieces should be prepared for each mixing ratio, and the test pieces are maintained to the specified age at 20 +/-2 ℃.
As a further improvement of the construction method of the premixed fluid solidified soil, in S4:
s4.1: the mixing process is determined, the premixed fluid solidified soil is intensively mixed by a mixing station, and the mixing process comprises the following steps: firstly, putting the components of the curing agent, the additive and water into a slurry mixer according to the mixing proportion to be mixed into slurry, and then putting the curing agent slurry and soil into the mixer to be mixed into a cured soil mixture;
s4.2: the composition and the metering of the mixing station are determined,
s4.3: the mixing requirement is met during mixing.
As a further improvement of the construction method of the premixed fluid solidified soil, in S4.2:
mixing and metering determinations at a mixing station using a ready mixed fluid solidified soil mixing system comprising:
the curing agent storage, conveying and metering system is used for storing, conveying and metering the curing agent components, conveying the curing agent to the slurry stirrer by adopting a screw conveyer during conveying, and controlling by adopting a time relay during metering;
the water conveying and metering system adopts a clean water pump for mixing water conveying, and adopts a flowmeter for metering and a time relay for controlling;
the slurry mixing and conveying metering system is used for mixing the added curing agent and water into curing agent slurry, wherein the raw materials adopt fine powder particles, and the stirring equipment is sealed; slurry is conveyed by adopting pumping and is measured by an electromagnetic flowmeter;
the soil conveying and metering system adopts a dosing machine and a conveying belt to convey soil to a solidified soil stirrer, and the metering control adopts weighing metering.
As a further improvement of the construction method of the premixed fluid solidified soil, in S4.3, the mixing requirements are as follows:
when the mixture is mixed, various weighing machines are required to be kept accurate, the water content of the material is required to be frequently detected, and the consumption of the curing agent and the water is adjusted;
the allowable deviation of the amount of the ingredients is as follows, and the components of the curing agent are as follows by mass: plus or minus 2 percent, additive: plus or minus 1 percent;
the slump index control is adopted for the fluidity inspection of the solidified soil, and the slump detection method is executed by referring to the concrete slump detection;
the mixing water consumption is adjusted in time according to the actual slump;
the mixture should be stirred by special machinery for 2 minutes according to the requirements of uniform stirring and workability and fluidity.
As a further improvement of the construction method of the premixed fluid solidified soil, in S5:
s5.1: pouring the premixed fluid-state solidified soil in a layered and blocking mode, wherein the initial setting time and the final setting time of the solidified soil are respectively 6 hours and 12 hours, the upper layer pouring operation is carried out after the final setting of the lower layer, and the layered backfill height is controlled to be 2-3 m; during backfilling, a template is adopted for stubble blocking, a steel pipe frame is adopted for template back ridge erection, and sand bags are adopted for seam plugging of the irregular section of the fertilizer tank; the retaining wall is piled up by using woven bags to prevent the mold from running, the retaining wall is piled up by adopting 2.5m wide soil bags at 45 degrees when the retaining wall is put on a slope, the woven bags are filled with gravels, the woven bags are piled up by about 2.5m in height, after 12 hours of layered backfilling, the woven bags are continuously piled up on the backfilled soil surface, and the whole retaining wall is distributed in a step shape;
s5.2: in the process of backfilling the premixed fluid soil, an elevation control line on the side wall of a pit or a groove is checked to ensure that each pouring layer is horizontally carried out, construction machinery and personnel are reasonably proportioned during pouring, balanced operation is carried out, backfilling is carried out to the top elevation, and manual assistance is carried out to scrape the top elevation;
s5.3: the backfilling of the fertilizer tank is continuously carried out and completed as soon as possible, ground water is prevented from flowing into pits or grooves in the construction process, rain-proof drainage measures are arranged, and when solidified soil which is just backfilled or not initially solidified is soaked in rain, accumulated water and soft soil are removed and supplemented;
s5.4: when in pouring, the surface layer of the unhardened filling body is covered in heavy rain or continuous light rain;
s5.5: sampling in construction, and continuously pouring for less than 400m 3 When it is used, it should be pressed every 200m 3 Preparing a group of test pieces, and continuously pouring the test pieces to be larger than 400m 3 When it is used, the dosage should be every 400m 3 Preparing a group of test pieces, wherein the test piece preparation requirement is the same as that of a concrete test piece, the size is 100mm multiplied by 100mm, the 28-day strength of the solidified soil reaches 0.8MPa, and the slump is 180 mm-200 mm;
s5.6: leveling and acceptance, after backfilling to the height of the top mark, checking the elevation and the flatness by drawing wires or a guiding ruler, and leveling by a spade at an ultrahigh position; and (5) timely repairing and digging solidified soil at the low-lying position.
In S5, an elevation control line and a sectional template supporting position line for paying off and releasing layered pouring are measured.
As a further improvement of the construction method of the premixed fluid solidified soil, in S6, the concrete steps are as follows: and after the top layer is poured, immediately covering a plastic film or geotextile on the surface of the filling body for moisture preservation and maintenance, wherein the maintenance time is not less than 7 days.
The invention can ensure the quality of the solidified soil finished product, improve the construction efficiency, prevent the mould from moving when the backfill soil is poured and provide a stable formwork.
Drawings
FIG. 1 is a flow chart of a process for preparing ready-mixed fluidized solidified soil.
FIG. 2 is a schematic view showing the process of building a retaining wall with woven bags.
FIG. 3 is a schematic cross-sectional view of a layered backfill.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, as they may be fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1
1. The flow chart of the premixed fluid solidified soil process is shown in figure 1:
note that:
(1) the raw soil preparation comprises soil quantity measurement and calculation, soil quality detection and whether building garbage exists in the mixed solidified soil.
(2) The cleaning of the base groove ensures that garbage and accumulated water cannot exist in the base groove, the accumulated water in the base groove is cleaned, the base groove is not dry, and the base groove is dry and needs to be watered and moistened.
(3) And measuring, paying off, releasing an elevation control line for layered pouring and supporting a position line for a segmented template.
2. Selection of soil material
Preferably adopts clay, silty clay, sandy silt and the like, the content of organic matters is not more than 5 percent, and the particle size of the organic matters is not more than 50mm. Untreated contaminated soil must not be used as a raw material for solidified soil.
3. Selection of curing agent
In this embodiment, caO and SiO are used 2 And Al 2 O 3 The inorganic hydraulic cementing material as the main component is used as a soil curing agent. After the curing agent is fully mixed with the engineering soil, the physical and mechanical properties of the soil can be obviously improved through physical and chemical reactions among the components of the curing agent and the engineering soil, and a cured body which meets the environmental standard and keeps long-term stability is formed.
According to the design requirements of strength of the mixing soil and the solidified soil, a proper curing agent is selected, and the concrete technical standards of the finished curing agent are as follows:
physical index table
Serial number Index (es) Requirements (%)
1 Fineness (80 μm square hole screen allowance) ≤10
2 Water content ratio ≤1
Technological index table
Figure BDA0003873776280000051
Figure BDA0003873776280000061
Note: during construction, if the time from stirring to pouring is not more than 1h, the net slurry fluidity can be not required.
4. Solidified soil proportioning test
(1) According to experience, the content of the curing agent is preliminarily determined to be 18%, and the water cement ratio of the curing agent is 1:2, trial assembly is carried out.
(2) The quality of the soil for trial preparation is not less than 30kg. Calculating the mass of the mixed curing agent according to the selected reference value of the mixing ratio of the curing agent, wherein the mass of the mixed curing agent is calculated according to the formula of 5.3-1:
Figure BDA0003873776280000062
in the formula: m is 0 -mass (kg) of construction soil;
m c -mass of curing agent (kg);
w 0 water content (%) of the test soil.
(3) According to the water-cement ratio of the selected curing agent slurry, the water addition amount is calculated according to the formula (5.3-2):
Figure BDA0003873776280000063
in the formula: m is a unit of w -mass of water (kg);
mu-water cement ratio of the curing agent slurry.
(4) According to the mass m of the soil 0 And calculating the mass of the obtained curing agent and the mass of water, and determining the calculated mixing proportion of the premixed fluid state curing soil.
(5) The mix proportion test should be performed on the basis of the calculated mix proportion. The dosage of each material in the mixing proportion is adjusted and calculated through trial assembly until the performance of the solidified soil meets the design and construction requirements.
(6) At least three mixing ratios should be adopted for the test. When 3 mixing proportion tests are adopted, 1 of the mixing proportion tests is the calculated mixing proportion determined by the standard, and the other 2 mixing proportions are suitable for adjusting the using amount of the curing agent on the basis of the calculated mixing proportion, and respectively increasing and reducing by 3-5%.
(7) At least one group of standard test pieces should be prepared for each mixing proportion, and the test pieces are maintained to the specified age under the condition of 20 +/-2 ℃.
5. Premixing fluidized solidified soil
(1) Mixing process
And intensively stirring the premixed fluidized solidified soil by adopting a stirring station. And (3) mixing: firstly, the components of the curing agent, the additive (if necessary, added), and the like are put into a slurry mixer according to the mixing ratio with water to be mixed into slurry, and then the curing agent slurry and soil are put into the mixer to be mixed into a cured soil mixture.
(2) Mixing station composition and metering
The system comprises a premixing fluid state solidified soil mixing system and a special solidified soil stirrer for the system, wherein the added solidified agent slurry and soil are mixed into solidified soil. The single set of solidified soil mixing station comprises the following systems:
1) And each component of the curing agent is stored, conveyed and metered by the system. The system mainly completes the storage, transportation and metering of all components of the curing agent. And conveying the curing agent to a slurry stirrer by using a screw conveyer, and controlling the metering by using a time relay.
2) The mixing water conveying adopts a clean water pump, and adopts a flowmeter for metering and a time relay for controlling.
3) The slurry mixing and conveying system is used for mixing the added curing agent and water into curing agent slurry, the raw materials are mostly fine powder particles, and the stirring equipment has airtightness. The slurry is conveyed by adopting pumping and metering by an electromagnetic flowmeter.
4) A soil delivery and metering system. The system adopts a batching machine and a conveyer belt to convey soil to a solidified soil stirrer. The metering control adopts weighing metering.
(3) Blending requirements
When the mixture is stirred, various weighing machines should be kept accurate, and the water content of the material should be detected frequently so as to adjust the dosage of the curing agent and the water.
The allowable deviation (by mass) of the amount of the ingredients is as follows: plus or minus 2 percent, additive: plus or minus 1 percent.
The slump index control is adopted for the solidified soil fluidity inspection, and the slump detection method is executed by referring to the concrete slump detection.
Because the weight of the soil is calculated according to the dry weight during the mixing proportion test, the water content of the soil during mixing can influence the slump of the solidified soil, and the mixing water consumption can be timely adjusted according to the actual slump.
The mixture is stirred by a special machine for 2 minutes, and the requirements of uniform stirring and workability and fluidity are met.
6. Solidified soil layered backfilling
(1) The premixed fluidized solidified soil is preferably poured in a layered and blocking mode. The initial setting time and the final setting time of the solidified soil are respectively 6 hours and 12 hours, the upper layer pouring operation is carried out after the final setting of the lower layer, and the layered backfill height is controlled to be 2-3 m.
The method can prevent the slurry leakage and the slurry leakage of the fluidized solidified soil for the backfilling of the fertilizer tank from influencing the structural construction, and the backfilling of each area has time difference, so that the stubbles are blocked by adopting the template during the backfilling, the steel pipe frame is adopted for erecting the template as the template back edge, and the joint plugging is carried out on the irregular section of the fertilizer tank by adopting a sand bag.
The retaining wall is piled up by using the woven bags to prevent the mold from running, and the retaining wall is put on a slope and is piled up by adopting 2.5m wide soil bags at 45 degrees. The woven bags are filled with gravels, the height of the woven bags is about 2.5m, after 12 hours of layered backfilling, the woven bags are continuously piled on the backfilled soil surface, and the whole woven bags are distributed in a step shape (the actual piling distribution condition is based on the field condition) and face the soil surface. Guarantee that constructor can walk from the braided bag from top to bottom. The node schematic diagram is shown in fig. 2:
(2) In the process of backfilling the premixed fluid soil, an elevation control line on the side wall of a pit (groove) is checked to ensure that each pouring layer is basically horizontally carried out, and construction machinery and personnel are reasonably proportioned during pouring and are carried out in a balanced manner. Backfilling to the top elevation, and manually scraping.
(3) The fertilizer tank backfilling is continuously carried out as soon as possible. During construction, ground water is prevented from flowing into the pit (groove). Should have rain-proof drainage measures. If the solidified soil which is just backfilled or not solidified initially is soaked in rain, accumulated water and soft soil are removed and filled.
(4) And in the pouring process, the surface layer of the unhardened filling body is covered when the filling body is in heavy rain or in continuous light rain.
(5) Construction sampling
Continuously casting for less than 400m 3 When it is used, it should be pressed every 200m 3 And (3) preparing a group of test pieces, wherein when the continuous casting is more than 400m & lt 3 & gt, a group of test pieces are prepared according to the length of each 400m & lt 3 & gt, the test piece manufacturing requirement is the same as that of a concrete test piece, and the size is 100mm multiplied by 100 mm. The strength of the solidified soil reaches 0.8MPa in 28 days, and the slump is 180-200 mm.
(6) Leveling and acceptance
After backfilling to the top elevation, checking elevation and flatness by drawing wires or a guiding rule, and leveling by a spade at an ultrahigh position; and (5) timely repairing and digging solidified soil at the low-lying position.
(7) Maintaining
And after the top layer is poured, immediately covering a plastic film or geotextile on the surface of the filling body for moisture preservation and maintenance. The curing time is not less than 7 days.
According to the embodiment, the special efficient rock-soil solidifying agent can be prepared from local solid wastes according to engineering requirements and rock-soil characteristics; taking out soil on site, adding a curing agent and water to form a mixture with certain fluidity; and forming the geotechnical engineering material with strength after hardening through pouring and maintenance.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several equivalent substitutions or obvious modifications can be made without departing from the spirit of the invention, and all the properties or uses are considered to be within the scope of the invention.

Claims (10)

1. A construction method of premixed fluid solidified soil is characterized by comprising the following steps:
s1: selecting soil;
s2: selecting a curing agent;
s3: testing the proportion of the solidified soil;
s4: stirring the premixed fluid solidified soil;
s5: backfilling solidified soil layer by layer;
s6: and (5) maintaining.
2. The construction method of the ready-mixed fluidized solidified soil according to claim 1, wherein in S1:
firstly, clay, silty clay and sandy silt are adopted, the content of organic matters is not more than 5 percent, the particle size is not more than 50mm, and untreated polluted soil cannot be used as a raw material of solidified soil.
3. The construction method of the ready-mixed fluidized solidified soil according to claim 1, wherein in S2:
adopts CaO and SiO 2 And Al 2 O 3 The inorganic hydraulic cementing material as the main component is used as a soil curing agent, and the concrete technical standard of the finished curing agent is as follows:
fineness: the sieve allowance of the 80 mu m square hole sieve is less than or equal to 10 percent;
the water content is less than or equal to 1 percent;
during construction, the fluidity of the solidified soil neat paste in a mixing state is enabled to be not less than 100mm initially, not less than 90mm in 30min, not less than 60min and not less than 80mm, and the initial setting time is not less than 45min;
or when the pouring time is not more than 1h after stirring, the net slurry fluidity is not required.
4. The construction method of the ready-mixed fluidized solidified soil according to claim 1, wherein in S3:
s3.1: firstly, preliminarily determining the content of a curing agent and the water-cement ratio of the curing agent, and performing trial preparation;
s3.2: determining the lower limit value of the soil mass for trial preparation, calculating the mass of the mixed curing agent according to the selected reference value of the mixing ratio of the curing agent, wherein the mass of the mixed curing agent is calculated according to the formula (1):
Figure FDA0003873776270000011
in the formula: m is a unit of 0 The mass of the soil material for construction, unit: kg;
m c mass kg of the curing agent, unit: kg;
w 0 the water content of the soil material for the test, unit: %;
s3.3: according to the water-cement ratio of the selected curing agent slurry, the water addition amount is calculated according to the formula (2):
Figure FDA0003873776270000012
in the formula:
m w -mass of water, unit: kg;
mu-water-cement ratio of curing agent slurry;
s3.4: according to the mass m of the soil 0 Calculating the mass of the obtained curing agent and the mass of water, and determining the calculated mixing proportion of the premixed fluid state curing soil;
s3.5: the mixing proportion test is carried out on the basis of calculating the mixing proportion, and the use amount of various materials in the mixing proportion is adjusted and calculated through trial mixing until the performance of the solidified soil meets the design and construction requirements;
s3.6: at least three mixing ratios are adopted for testing, when 3 mixing ratios are adopted for testing, 1 mixing ratio is calculated according to the standard, and the use amount of the curing agent is adjusted on the basis of the calculated mixing ratios by 2 mixing ratios, wherein the use amount of the curing agent is respectively increased and decreased by 3-5%;
s3.7: at least one group of standard test pieces should be prepared for each mixing proportion, and the test pieces are maintained to the specified age under the condition of 20 +/-2 ℃.
5. The construction method of the ready-mixed fluidized solidified soil according to claim 1, wherein in S4:
s4.1: the mixing process is determined, the premixed fluid solidified soil is intensively mixed by a mixing station, and the mixing process comprises the following steps: firstly, putting all components of a curing agent, an additive and water into a slurry stirrer according to a mixing ratio to be mixed into slurry, and then putting the curing agent slurry and soil into the stirrer to be stirred into a cured soil mixture;
s4.2: the composition and the metering of the mixing station are determined,
s4.3: the mixing requirement is met during mixing.
6. The method for constructing the premixed fluid solidified soil according to claim 5, wherein in S4.2:
blending and metering determination at a blending station using a ready-blended fluidized solidified soil blending system comprising:
the curing agent storage, conveying and metering system is used for storing, conveying and metering the curing agent components, conveying the curing agent to the slurry stirrer by adopting a screw conveyer during conveying, and controlling by adopting a time relay during metering;
the water conveying and metering system adopts a clear water pump for mixing water conveying, and adopts a flowmeter for metering and a time relay for controlling;
the slurry mixing and conveying metering system is used for mixing the added curing agent and water into curing agent slurry, wherein the raw material adopts fine powder particles, and the stirring equipment is sealed; slurry is conveyed by adopting pumping and is measured by an electromagnetic flowmeter;
the soil conveying and metering system adopts a dosing machine and a conveying belt to convey soil to a solidified soil stirrer, and the metering control adopts weighing metering.
7. The construction method of the ready-mixed fluidized solidified soil according to claim 5, wherein in S4.3, the mixing requirements are as follows:
when the mixture is stirred, various weighing machines should be kept accurate, the water content of the material should be frequently detected, and the dosage of the curing agent and the water is adjusted according to the detection;
the allowance deviation of the amount of the ingredients is as follows, and the curing agent comprises the following components in percentage by mass: plus or minus 2 percent, additive: plus or minus 1 percent;
the slump index control is adopted for the fluidity inspection of the solidified soil, and the slump detection method is executed by referring to the concrete slump detection;
the mixing water consumption is adjusted in time according to the actual slump;
the mixture should be stirred by special machinery for 2 minutes according to the requirements of uniform stirring and workability and fluidity.
8. The construction method of the ready-mixed fluidized solidified soil according to claim 1, wherein in S5:
s5.1: pouring the premixed fluid-state solidified soil in a layered and blocking mode, wherein the initial setting time and the final setting time of the solidified soil are respectively 6 hours and 12 hours, the upper layer pouring operation is carried out after the final setting of the lower layer, and the layered backfill height is controlled to be 2-3 m; during backfilling, a template is adopted for stubble blocking, a steel pipe frame is adopted for template back ridge erection, and sand bags are adopted for seam plugging of the irregular section of the fertilizer tank; the retaining wall is piled up by using woven bags to prevent the mold from running, the retaining wall is piled up by adopting 2.5m wide soil bags at 45 degrees when the retaining wall is put on a slope, the woven bags are filled with gravels, the woven bags are piled up by about 2.5m in height, after 12 hours of layered backfilling, the woven bags are continuously piled up on the backfilled soil surface, and the whole retaining wall is distributed in a step shape;
s5.2: in the process of backfilling the premixed fluid soil, an elevation control line on the side wall of a pit or a groove is checked to ensure that each pouring layer is horizontally carried out, construction machinery and personnel are reasonably proportioned during pouring, balanced operation is carried out, backfilling is carried out to the top elevation, and manual assistance is carried out to scrape the top elevation;
s5.3: the backfilling of the fertilizer tank is continuously carried out, the backfilling is completed as soon as possible, surface water is prevented from flowing into the pit or the tank in the construction process, a rainproof drainage measure is arranged, and when solidified soil which is just backfilled or is not initially solidified is soaked in rain, accumulated water and soft soil are removed and are filled;
s5.4: when in pouring, the surface layer of the unhardened filling body is covered in heavy rain or continuous light rain;
s5.5: sampling in construction, and continuously pouring for less than 400m 3 When it is used, it should be pressed every 200m 3 Preparing a group of test pieces, and continuously pouring the test pieces to be larger than 400m 3 When it is used, the dosage should be every 400m 3 Preparing a group of test pieces, wherein the test piece preparation requirement is the same as that of a concrete test piece, the size adopts the specification of 100mm multiplied by 100mm, the 28-day strength of the solidified soil reaches 0.8MPa, and the slump is 180 mm-200mm；
S5.6: leveling and accepting, after backfilling to the height of the top mark, checking the elevation and the flatness by drawing lines or a guiding ruler, and leveling the ultrahigh part by a shovel; and (5) timely repairing and digging solidified soil at the low-lying position.
9. The method as claimed in claim 8, wherein in step S5, the step of paying off and releasing an elevation control line for layered casting and a position line for supporting a sectional form are measured.
10. The construction method of the ready-mixed fluidized solidified soil according to claim 1, wherein in the step S6, the concrete steps are as follows: and after the top layer is poured, immediately covering a plastic film or geotextile on the surface of the filling body for moisture preservation and maintenance, wherein the maintenance time is not less than 7 days.
CN202211217888.5A 2022-09-30 2022-09-30 Construction method of premixed fluidized solidified soil Pending CN115401790A (en)

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