CN113718761B - Method for forming coastal soft soil foundation cement soil composite mixing pile - Google Patents
Method for forming coastal soft soil foundation cement soil composite mixing pile Download PDFInfo
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- CN113718761B CN113718761B CN202111053295.5A CN202111053295A CN113718761B CN 113718761 B CN113718761 B CN 113718761B CN 202111053295 A CN202111053295 A CN 202111053295A CN 113718761 B CN113718761 B CN 113718761B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/46—Concrete or concrete-like piles cast in position ; Apparatus for making same making in situ by forcing bonding agents into gravel fillings or the soil
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- 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
- C04B28/10—Lime cements or magnesium oxide cements
- C04B28/12—Hydraulic lime
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- 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)
- Materials Engineering (AREA)
- Inorganic Chemistry (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a coastal soft soil foundation cement soil composite mixing pile forming method, which comprises the following steps: leveling a field, positioning, centering and leveling a pile machine; starting a deep mixing pile machine, and sinking at a set speed; while the deep mixing pile machine is pre-stirred and sinks, the main material and the auxiliary material with corresponding weight are fully mixed and uniformly stirred with water in the background to obtain cement slurry; after the pile machine sinks to reach the designed depth, starting a slurry pump, pumping the slurry to a slurry outlet of a stirring head, starting the stirring pile machine and a tensioning chain device after slurry is discharged, and lifting a drill rod of the pile machine while spraying and stirring at a lifting speed determined according to the design so as to fully mix the slurry and a soil body; and after one pile is constructed, moving the pile machine to the next pile position, and repeating the steps until the construction of all the stirring piles in the field is completed. The method can accelerate the hydration speed of the cement and improve the hydration degree of the cement by effectively improving the dispersibility of the cement particles, thereby improving and ensuring the pile forming quality of the mixing pile.
Description
Technical Field
The invention belongs to the technical field of civil engineering, and particularly relates to a coastal soft soil foundation cement soil composite mixing pile forming method.
Background
China is wide in territory and complex in geological conditions, and many urban foundation constructions often encounter soft soil foundations. The water content of the soft soil is higher than the liquid limit, and the pore ratio is more than 1, so the compressibility of the soft soil is higher, and the bearing capacity is not ideal. Because the bearing capacity is extremely low, the engineering geological condition is poor, and greater settlement or deformation can be generated in the engineering, which causes great harm to the roadbed construction, technical means such as cement soil composite mixing piles and the like are often adopted for processing to reach the engineering geological requirement, but the mixing piles constructed by the existing pile forming method still have the technical problem of insufficient bearing capacity.
In view of the above, there is a need for improvements in the prior art.
Disclosure of Invention
The invention mainly aims to provide a method for forming a coastal soft soil foundation cement soil composite mixing pile, aiming at effectively improving the dispersibility of cement particles, accelerating the hydration speed of cement and improving the hydration degree of cement, thereby improving and ensuring the pile forming quality of the mixing pile.
Therefore, the method for forming the coastal soft soil foundation cement soil composite mixing pile provided by the embodiment of the invention comprises the following steps:
leveling a field, positioning, centering and leveling a pile machine;
step two, starting the deep mixing pile machine, and sinking at a set speed;
step three, pre-stirring and sinking the deep mixing pile machine, and fully mixing and uniformly stirring the main materials and the auxiliary materials with corresponding parts with water by the background to obtain cement slurry, wherein the main materials comprise cement, lime and an excitant, and the auxiliary materials comprise silicon powder, sea sand, slag and fly ash;
step four, after the pile machine sinks to reach the designed depth, starting a slurry pump, pumping slurry to a slurry outlet of the stirring head, starting the stirring pile machine and a chain tensioning device after slurry is discharged, and lifting a drill rod of the pile machine while spraying and stirring according to the lifting speed determined by design so as to fully mix the slurry and the soil body;
step five, after one pile is constructed, moving the pile machine to the next pile position, and repeating the steps until all the mixing piles in the field are constructed;
the main material mixing amount is 8% -16% of the mass of soft soil to be reinforced, the auxiliary material mixing amount is 45% -55% of the mass of the soft soil to be reinforced, the cement mixing amount is 40% -65% of the mass of the main material, the lime mixing amount is 25% -45% of the mass of the main material, the excitant mixing amount is 3.5% -8% of the mass of the main material, the silica powder mixing amount is 10% -15% of the mass of the auxiliary material, the sea sand mixing amount is 32% -54.5% of the mass of the auxiliary material, the slag mixing amount is 15% -28% of the mass of the auxiliary material, and the fly ash mixing amount is 20% -36% of the mass of the auxiliary material.
Specifically, the cement is ordinary portland cement of PO42.5 grade.
Specifically, the excitant is sodium silicate or sulfate.
Specifically, the particle diameter of the silicon powder is 80-120 meshes.
Specifically, the particle size of the sea sand is less than or equal to 1mm.
Specifically, the grade of the slag is greater than S95.
Specifically, the fly ash is F-class II-grade fly ash.
Specifically, in the fourth step, the drill rod needs to be repeatedly lifted and sunk for 2 to 4 times in the stirring process.
Specifically, the lifting speed in the fourth step is 0.50-0.8m/min.
Specifically, the content of CaO + MgO in the lime is not less than 80%.
Specifically, in the second step, the sinking speed of the medium-deep mixing pile machine is 0.35-0.75m/min.
At least one embodiment of the invention has the following beneficial effects: the invention fully utilizes sea sand to reduce river sand resource exploitation, utilizes slag to improve the quality of silt clay, and because the main components of alkaline residue are calcium salts such as calcium carbonate, calcium sulfate, calcium chloride and the like, hydrated calcium carbonate, hydrated calcium aluminosilicate and the like are generated after hydration reaction, and the hydrated products not only can effectively fill the pores of the soil body, but also have strong physical cementation capability, can well connect soil particles, and can effectively improve the quality of clay. Meanwhile, through the accurate cooperative control of the material components of each component, the problems that the pile forming of the mixing pile is difficult and the pile forming quality is poor in coastal areas are solved, the pile body integrity of the prepared cement-soil composite mixing pile is better, and the strength is improved by about 35 percent compared with that of the conventional cement mixing pile.
Detailed Description
The present invention will be further described with reference to the following embodiments.
The soil and muddy clay foundations with physical parameters shown in the table 1 are reinforced.
TABLE 1 basic physical indexes of silt clay and muddy clay in Zhuhai Hongwan logistic park area
Example 1
A coastal soft soil foundation cement soil composite mixing pile forming method comprises the following steps:
leveling a field, positioning, centering and leveling a pile machine, and adjusting the verticality of a guide frame, wherein the verticality is less than 1.0% of the pile length;
step two, starting the deep mixing pile machine, and sinking at the speed of 0.35-0.75 m/min;
step three, pre-stirring and sinking a deep mixing pile machine, fully mixing and uniformly stirring main materials and auxiliary materials with corresponding parts and water in a background to obtain cement slurry, wherein the main materials comprise PO 42.5-grade ordinary portland cement, lime and an exciting agent, the auxiliary materials comprise 80-120-mesh silicon powder, sea sand with the particle size of less than or equal to 1mm, slag with the grade of more than S95 and F-class II-grade fly ash, the content of CaO and MgO in the lime is not less than 80%, the mass of SiO2 in the silicon powder accounts for 85-90%, and the exciting agent is sodium silicate or sulfate;
fourthly, after the pile machine sinks to reach the designed depth, starting a slurry pump, pumping slurry to a slurry outlet of the stirring head, starting the stirring pile machine and a tensioning chain device after slurry is discharged, lifting a drill rod of the pile machine while spraying and stirring according to the lifting speed (0.50-0.8 m/min) determined by design, fully stirring the slurry and a soil body, repeatedly lifting, stirring and sinking for 2-4 times, ensuring that the slurry is fully contacted with a soft soil body, and ensuring the quality of the stirring pile;
step five, after one pile is constructed, moving the pile machine to the next pile position, and repeating the steps until all the mixing piles in the field are constructed;
wherein, the main material is 16% of the soft soil mass to be reinforced, and the auxiliary material is 45% of the soft soil mass to be reinforced, wherein: the mixing amount of the cement is 60% of the mass of the main material, the mixing amount of the lime is 35% of the mass of the main material, the mixing amount of the excitant is 5% of the mass of the main material, the mixing amount of the silicon powder is 10% of the mass of the auxiliary material, the mixing amount of the sea sand is 50% of the mass of the auxiliary material, the mixing amount of the slag is 25% of the mass of the auxiliary material, and the mixing amount of the fly ash is 15% of the mass of the auxiliary material. The components of the curing material in the proportion are fully and uniformly mixed, water is added for uniform stirring, and after the stirring pile is solidified, a core is drilled, and the unconfined compressive strength of the core is measured, namely the unconfined compressive strength of the core is measured at 7d, 14d and 28d, as shown in table 2.
Example 2
Different from the embodiment 1, the main material is 12% of the mass of the soft soil to be reinforced, and the auxiliary material is 50% of the mass of the soft soil to be reinforced, wherein: the mixing amount of the cement is 45% of the mass of the main material, the mixing amount of the lime is 50% of the mass of the main material, the mixing amount of the excitant is 5% of the mass of the main material, the mixing amount of the silicon powder is 10% of the mass of the auxiliary material, the mixing amount of the sea sand is 45% of the mass of the auxiliary material, the mixing amount of the slag is 25% of the mass of the auxiliary material, and the mixing amount of the fly ash is 20% of the mass of the auxiliary material. The components of the curing material in the proportion are fully and uniformly mixed, water is added for uniform stirring, and after the stirring pile is solidified, a core is drilled, and samples are taken to measure the unconfined compressive strength of 7d, 14d and 28d, as shown in table 2.
Example 3
The difference from the embodiment 1 is that the main material accounts for 8% of the mass of the soft soil to be reinforced, the auxiliary material accounts for 55% of the mass of the soft soil to be reinforced, the cement mixing amount accounts for 50% of the mass of the main material, the lime mixing amount accounts for 45% of the mass of the main material, the excitant mixing amount accounts for 5% of the mass of the main material, the silica powder mixing amount accounts for 10% of the mass of the auxiliary material, the sea sand mixing amount accounts for 40% of the mass of the auxiliary material, the slag mixing amount accounts for 25% of the mass of the auxiliary material, and the fly ash mixing amount accounts for 25% of the mass of the auxiliary material. The components of the curing material in the proportion are fully and uniformly mixed, water is added for uniform stirring, and after the stirring pile is solidified, a core is drilled, and samples are taken to measure the unconfined compressive strength of 7d, 14d and 28d, as shown in table 2.
Comparative example 1
Different from the embodiment 1, the main material accounts for 8% of the mass of the soft soil to be reinforced, the auxiliary material accounts for 60% of the mass of the soft soil to be reinforced, the cement mixing amount accounts for 60% of the mass of the main material, the lime mixing amount accounts for 35% of the mass of the main material, the excitant mixing amount accounts for 5% of the mass of the main material, the silica powder mixing amount accounts for 15% of the mass of the auxiliary material, the sea sand mixing amount accounts for 35% of the mass of the auxiliary material, the slag mixing amount accounts for 25% of the mass of the auxiliary material, and the fly ash mixing amount accounts for 25% of the mass of the auxiliary material. The components of the curing material in the proportion are fully and uniformly mixed, water is added for uniform stirring, and after the stirring pile is solidified, a core is drilled, and the unconfined compressive strength of the core is measured, namely the unconfined compressive strength of the core is measured at 7d, 14d and 28d, as shown in table 2.
Comparative example 2
Different from the embodiment 1, the main material accounts for 12% of the mass of the soft soil to be reinforced, the auxiliary material accounts for 40% of the mass of the soft soil to be reinforced, the cement mixing amount accounts for 45% of the mass of the main material, the lime mixing amount accounts for 50% of the mass of the main material, the excitant mixing amount accounts for 5% of the mass of the main material, the silica powder mixing amount accounts for 15% of the mass of the auxiliary material, the sea sand mixing amount accounts for 35% of the mass of the auxiliary material, the slag mixing amount accounts for 20% of the mass of the auxiliary material, and the fly ash mixing amount accounts for 30% of the mass of the auxiliary material. The components of the curing material in the proportion are fully and uniformly mixed, water is added for uniform stirring, and after the stirring pile is solidified, a core is drilled, and the unconfined compressive strength of the core is measured, namely the unconfined compressive strength of the core is measured at 7d, 14d and 28d, as shown in table 2.
Comparative example 3
The difference from the embodiment 1 is that the main material accounts for 8% of the mass of the soft soil to be reinforced, the auxiliary material accounts for 40% of the mass of the soft soil to be reinforced, the cement mixing amount accounts for 60% of the mass of the main material, the lime mixing amount accounts for 35% of the mass of the main material, the excitant mixing amount accounts for 5% of the mass of the main material, the silica powder mixing amount accounts for 10% of the mass of the auxiliary material, the sea sand mixing amount accounts for 40% of the mass of the auxiliary material, the slag mixing amount accounts for 25% of the mass of the auxiliary material, and the fly ash mixing amount accounts for 25% of the mass of the auxiliary material. The components of the curing material in the proportion are fully and uniformly mixed, water is added for uniform stirring, and after the stirring pile is solidified, a core is drilled, and samples are taken to measure the unconfined compressive strength of 7d, 14d and 28d, as shown in table 2.
TABLE 2 compressive Strength test results (MPa)
From the data of the three examples, the compressive strength of the three time periods in the examples 1 to 3 is higher than the design requirement, and the compressive strength of the 7d in the comparative examples 1 to 3 is lower than the requirement of 0.70MPa, which shows that the fly ash and the silica powder in the proportion well play the role of the micro-aggregate, effectively improve the dispersibility of cement particles, accelerate the hydration speed of the cement, improve the hydration degree of the cement, fully utilize the sea sand to reduce the exploitation of river sand resources, effectively reduce the cost and save the resources.
The above examples are merely illustrative for clearly illustrating the present invention and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. Nor is it intended to be exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the scope of the invention.
Claims (9)
1. A coastal soft soil foundation cement soil composite mixing pile forming method is characterized by comprising the following steps:
leveling a field, positioning, centering and leveling a pile machine;
step two, starting the deep mixing pile machine, and sinking at a set speed;
step three, pre-stirring and sinking the deep mixing pile machine, and fully mixing and uniformly stirring the main materials and the auxiliary materials with corresponding parts with water by the background to obtain cement slurry, wherein the main materials comprise cement, lime and an excitant, and the auxiliary materials comprise silicon powder, sea sand, slag and fly ash;
step four, after the pile machine sinks to reach the designed depth, starting a slurry pump, pumping cement slurry to a slurry outlet of the stirring head, starting the stirring pile machine and a tensioning chain device after slurry is discharged, and lifting a drill rod of the pile machine while spraying and stirring according to the lifting speed determined by design so as to fully mix the slurry and a soil body;
step five, after one pile is constructed, moving the pile machine to the next pile position, and repeating the steps until all the mixing piles in the field are constructed;
the main material mixing amount is 8% -16% of the mass of soft soil to be reinforced, the auxiliary material mixing amount is 45% -55% of the mass of the soft soil to be reinforced, the cement mixing amount is 40% -65% of the mass of the main material, the lime mixing amount is 25% -45% of the mass of the main material, the excitant mixing amount is 3.5% -8% of the mass of the main material, the silica powder mixing amount is 10% -15% of the mass of the auxiliary material, the sea sand mixing amount is 32% -54.5% of the mass of the auxiliary material, the slag mixing amount is 15% -28% of the mass of the auxiliary material, and the fly ash mixing amount is 20% -36% of the mass of the auxiliary material;
the mass of SiO2 in the silicon powder accounts for 85-90 percent, and the particle diameter of the silicon powder is 80-120 meshes.
2. The pile-forming method of claim 1, wherein: the cement is ordinary portland cement of PO42.5 grade.
3. The pile-forming method of claim 1, wherein: the excitant is sodium silicate or sulfate.
4. The pile-forming method of claim 1, wherein: the particle size of the sea sand is less than or equal to 1mm.
5. The pile-forming method of claim 1, wherein: the grade of the slag is greater than S95 grade.
6. The pile-forming method according to claim 1, characterized in that: the fly ash is F-class I/class I fly ash.
7. The pile-forming method according to claim 1, characterized in that: in the fourth step, the drill rod needs to be repeatedly lifted and sunk for 2-4 times in the stirring process.
8. The pile-forming method according to claim 1, characterized in that: the lifting speed in the fourth step is 0.50-0.8m/min.
9. The pile-forming method of claim 1, wherein: and in the second step, the sinking speed of the deep mixing pile machine is 0.35-0.75m/min.
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| JP3831282B2 (en) * | 2002-03-25 | 2006-10-11 | 日本高圧コンクリート株式会社 | Pile circumference fixing liquid and underground pile creation method |
| CN101177338A (en) * | 2006-11-09 | 2008-05-14 | 梁辰 | Highly-controllable strength and dimensionally-stable curing material |
| KR100852393B1 (en) * | 2007-06-01 | 2008-08-14 | 이갑석 | Method for solidifying soils and industrial wastes, and materials solidified by the method |
| CN101250872A (en) * | 2008-03-24 | 2008-08-27 | 徐玉杰 | Flabbiness ground strengthened cement mortar stirring pile and pile-formation method thereof |
| CN102021906A (en) * | 2010-12-16 | 2011-04-20 | 河南省新开元路桥工程咨询有限公司 | Method for reinforcing soft soil foundation at deep mixing pile |
| CN102518126A (en) * | 2011-11-24 | 2012-06-27 | 华南理工大学 | Method for preparing cement-soil mixing pile |
| CN104891893A (en) * | 2015-05-13 | 2015-09-09 | 河海大学 | Coastal soft foundation soil solidifying and reinforcing material and application thereof |
| CN109020333A (en) * | 2018-09-10 | 2018-12-18 | 沙焕焕 | Sea sand reinforcement mix soil-cement body and application thereof |
| CN112921945A (en) * | 2021-01-27 | 2021-06-08 | 中钢集团马鞍山矿山研究总院股份有限公司 | Method for reinforcing soft soil foundation by taking industrial solid wastes as main raw materials |
| CN113235579B (en) * | 2021-04-23 | 2022-06-17 | 海南大学 | Frozen microbial soil stirring pile |
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