CN115324126A - Stirring pile test device for indoor simulation of underground water flow and use method thereof - Google Patents
Stirring pile test device for indoor simulation of underground water flow and use method thereof Download PDFInfo
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- CN115324126A CN115324126A CN202210982577.1A CN202210982577A CN115324126A CN 115324126 A CN115324126 A CN 115324126A CN 202210982577 A CN202210982577 A CN 202210982577A CN 115324126 A CN115324126 A CN 115324126A
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- 238000003756 stirring Methods 0.000 title claims abstract description 111
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 87
- 238000012360 testing method Methods 0.000 title claims abstract description 36
- 238000004088 simulation Methods 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims description 28
- 239000002689 soil Substances 0.000 claims abstract description 44
- 238000002156 mixing Methods 0.000 claims abstract description 39
- 239000011521 glass Substances 0.000 claims abstract description 33
- 239000002002 slurry Substances 0.000 claims abstract description 21
- 238000009792 diffusion process Methods 0.000 claims abstract description 10
- 239000004568 cement Substances 0.000 claims description 41
- 239000003795 chemical substances by application Substances 0.000 claims description 18
- 238000010276 construction Methods 0.000 claims description 13
- 230000008569 process Effects 0.000 claims description 13
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 10
- 239000012752 auxiliary agent Substances 0.000 claims description 10
- 229910000831 Steel Inorganic materials 0.000 claims description 7
- 239000010959 steel Substances 0.000 claims description 7
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 6
- 238000005507 spraying Methods 0.000 claims description 6
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims description 5
- 239000003673 groundwater Substances 0.000 claims description 5
- 239000010440 gypsum Substances 0.000 claims description 5
- 229910052602 gypsum Inorganic materials 0.000 claims description 5
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims description 5
- 235000019353 potassium silicate Nutrition 0.000 claims description 5
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 5
- 230000015271 coagulation Effects 0.000 claims description 3
- 238000005345 coagulation Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 claims description 3
- 238000012216 screening Methods 0.000 claims description 3
- 238000009833 condensation Methods 0.000 abstract description 2
- 230000005494 condensation Effects 0.000 abstract description 2
- 230000000007 visual effect Effects 0.000 abstract 1
- 239000011398 Portland cement Substances 0.000 description 8
- 239000000463 material Substances 0.000 description 3
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 2
- 235000017491 Bambusa tulda Nutrition 0.000 description 2
- 241001330002 Bambuseae Species 0.000 description 2
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 2
- 239000011425 bamboo Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- 239000004115 Sodium Silicate Substances 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229910052911 sodium silicate Inorganic materials 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
-
- 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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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (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)
Abstract
The invention discloses a stirring pile test device for indoor simulation of underground water flow, which comprises a stirring device, an underground environment simulation device, a water inlet device and a water outlet device, wherein the stirring device is used for simulating underground water flow; the underground environment simulation device comprises a stirring forming device and a glass box, wherein the stirring forming device is vertically arranged in the glass box, the stirring forming device and the glass box are sequentially filled with a first soil layer and a second soil layer from bottom to top, and the length, the width and the height of the glass box are respectively provided with a scale; the stirring device comprises a speed-controllable automatic stirrer and an automatic lifting stirring rod, wherein a stirring head is arranged at the lower end of the automatic lifting stirring rod, a grouting pipe is arranged on the automatic lifting stirring rod, and the stirring head is positioned above the stirring forming device; the water inlet device and the water outlet device are respectively arranged on two sides of the glass box, the grouting diffusion condition and the slurry condensation condition of the mixing pile can be quantitatively observed, and the grouting device has the advantages of high efficiency, visual test, convenience in operation and reliable data.
Description
Technical Field
The invention relates to the field of geotechnical engineering soft soil foundation treatment, in particular to a stirring pile test device for indoor simulation of underground water flow and a using method thereof.
Background
The cement mixing pile is an effective method for reinforcing soft soil foundation, and is characterized by that it uses cement as main agent of solidifying agent, and utilizes the mixing pile machine to spray cement into soil body and fully mix them to make the cement and soil produce a series of physical and chemical reactions so as to make the soft soil be hardened and raise the strength of foundation. In the 70 s of the 20 th century, the reinforcing of soft soil foundations by cement mixing piles has been in history for over 40 years. The method is to forcibly stir the soft soil and the cement (curing agent) by a special deep layer stirrer, and solidify the soil body by utilizing a series of physical and chemical reactions generated between the cement and the soft soil to form the cement soil pile with integrity, water stability and certain strength.
At present, the main methods for researching cement mixing piles include three methods, namely field test, numerical simulation and indoor model test. The field test is the most direct and reliable method for researching the bearing capacity and the deformation characteristic of the cement mixing pile, and is the best means for verifying the indoor model test and the numerical analysis, but because the test period is longer, a large amount of capital investment is needed, the stratum condition is complex, the construction process is not easy to control, the characteristics of the pile foundation in a small area can only be obtained, and the regularity conclusion is not easy to obtain. The numerical analysis is a simple and convenient method for researching the stress deformation characteristic of the cement mixing pile, and the precision of the numerical analysis is mainly dependent on the coincidence degree of relevant material parameters, a selected theoretical model, interaction among all parts and the like and a real situation, so that the numerical analysis is greatly influenced by human factors. The indoor model test can accurately set and control boundary conditions and pile-soil material characteristics, has strong pertinence and pertinence when researching pile-soil interaction, can simplify analysis problems, grasps main contradictions, abandons secondary contradictions, and can obtain more regular things compared with field tests. Model testing may also validate numerical simulation analysis. Therefore, how to find a model test method for simulating a cement-soil mixing pile indoors is a key problem to be solved urgently at present.
In addition, coastal cities have more underground water, and two ways are provided for forming underground flowing water: one is that groundwater forms flowing water due to water head difference in the area causing water flow; another is that flowing water is formed due to leakage of groundwater resulting from defects and damages of waterproof curtains or waterproof structures. Therefore, the problem of diffusion of the mixing piles under the condition of groundwater flow in the construction process becomes the key for improving the bearing capacity of the soft soil foundation.
At present, most indoor stirring pile test devices do not consider underground flowing water conditions, and the diffusion rule of a stirring pile under the flowing water condition is greatly different from that under the still water condition, so that deep research needs to be carried out on a stirring pile forming indoor test under the underground water flowing condition.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a stirring pile test device for indoor simulation of underground water flow and a using method thereof, which can fully automatically simulate the forming process of a stirring pile under different underground water flow rates and different soil properties, find the slurry diffusion rule under the condition of flowing water and provide a more sufficient basis for the construction of a stirring pile of a soft soil foundation.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
the utility model provides an indoor simulation groundwater flow's stirring stake test device which characterized in that: comprises a stirring device, an underground environment simulation device, a water inlet device and a water outlet device;
the underground environment simulation device comprises a stirring forming device and an organic glass box, wherein the stirring forming device is vertically installed in the organic glass box, the stirring forming device and the organic glass box are sequentially filled with a first soil layer and a second soil layer from bottom to top, and the length, the width and the height of the organic glass box are respectively provided with a scale;
the stirring device comprises a speed-controllable automatic stirrer and an automatic lifting stirring rod, the automatic lifting stirring rod is connected with the speed-controllable automatic stirrer, a stirring head is arranged at the lower end of the automatic lifting stirring rod, a grouting pipe is arranged on the automatic lifting stirring rod, and the stirring head is positioned above the stirring and forming device;
the water inlet device and the water outlet device are respectively arranged on two sides of the organic glass box and are respectively communicated with the inside of the organic glass box.
Preferably, the stirring and forming device is a glass cylinder. The side wall of the stirring and forming device is provided with a plurality of through holes with the diameter smaller than 10mm, and the aperture ratio is not smaller than 50%.
Preferably, three groups of steel blades are adopted for the stirring head, and the included angle between every two steel blades is 60 degrees. The length of the stirring head (1.3) is less than the diameter of the stirring forming device (2.3). Three groups of steel blades of the stirring head (1.3) have the following sizes: the diameter of the first blade is d1, the length of d1 is 10-20cm, the diameter of the second blade is d2, the length of d2 is 8-16cm, the diameter of the third blade is d3, the length of d3 is mainly 4-8cm, and d1 is greater than d2 and greater than d3.
The water inlet device comprises a water inlet pipe and a flow meter, the water inlet pipe is communicated with the organic glass box, and the flow meter is arranged on the water inlet pipe.
The use method of the stirring pile test device for indoor simulation of underground water flow is characterized by comprising the following steps:
(1) Preparing a cement-based curing agent: one or more of metakaolin, water glass, gypsum, triethanolamine or sodium carbonate is mixed as an auxiliary agent, and the auxiliary agent is mixed into the cement, wherein the mixing amount is 5-20% of the cement, so that a cement-based curing agent is formed; the auxiliary agent is mixed into the cement, and the mixing amount is preferably 10% of the cement;
(2) Water movement simulation operation: the switch of the water inlet pipe is turned on, excessive water flows out through the water outlet pipe, the water flow speed is adjusted to be v1, and the construction process of the mixing pile is simulated at the flow speed;
(3) Stirring operation: adjusting the speed of a speed-controllable automatic stirrer and the height of an automatic lifting stirring rod, just placing a stirring head and a grouting pipe on the surface of a soil layer in a stirring pile forming device, simulating the two-spraying and four-stirring process in a construction site, spraying a cement-based curing agent when the stirring head is lifted, and mixing the cement-based curing agent and the soil layer to form slurry;
(4) Recording: observing the flowing process of the slurry, recording the scale value and time of the flowing of the slurry, drawing a flowing track diagram, screening the slurry proportion with slow diffusion and fast coagulation according to the result, and providing effective and sufficient data for engineering construction.
The invention has the following advantages:
1. the mixing pile test device for simulating the underground water flowing condition, provided by the invention, has the functions of simulating automatic lifting mixing, grouting, simulating the underground water flowing condition and the like, can quantitatively observe the mixing pile grouting diffusion condition and the slurry condensation condition, has the advantages of high efficiency, intuitive test, convenience in operation and reliable data, and provides a more sufficient basis for mixing pile construction under the underground water flowing condition.
2. The indoor mixing pile test device provided by the invention is completed by adopting two times of guniting and mixing, and is more uniform and complete than one-time mixing.
3. The indoor stirring pile test device provided by the invention solves the technical problems of long field test period, large investment, large influence of numerical analysis human factors, incapability of meeting practical requirements, insufficient indoor simulation dynamic conditions and the like.
Drawings
FIG. 1 is a schematic structural view of an indoor mixing pile test device for simulating underground water flow according to the present invention.
Fig. 2 is a top view of the mixing head of the present invention.
The labels in the figure are: 1-stirring device, 1.1-speed-controllable automatic stirrer, 1.2-automatic lifting stirring rod, 1.3-stirring head, 1.4-grouting pipe, 2-underground environment simulation device, 2.1-first soil layer, 2.2-second soil layer, 2.3-stirring forming device, 2.4-graduated scale, 2.5-organic glass box, 2.6-through hole, 3-water inlet device, 3.1-water inlet pipe, 3.2-flow velocity meter and 4-water outlet device.
Detailed Description
The present invention will be further described with reference to the accompanying drawings, but the present invention is not limited to the following examples, which are conventional unless otherwise specified, and the materials are commercially available from the public unless otherwise specified.
As shown in fig. 1 and 2, a stirring pile testing device for indoor simulation of underground water flow comprises a stirring device 1, an underground environment simulation device 2, a water inlet device 3 and a water outlet device 4.
Underground environment analogue means 2 includes stirring forming device 2.3 and organic glass case 2.5, and stirring forming device 2.3 is a glass section of thick bamboo, and the through-hole is seted up to the lateral wall of a glass section of thick bamboo, and vertical installation is in organic glass case 2.5, and stirring forming device 2.3 and organic glass case 2.5 are followed supreme first soil layer 2.1 and the second soil layer 2.2 of filling in proper order down, are equipped with scale 2.4 on organic glass case 2.5's the length width height respectively. The size of the organic glass box 2.5 is 30cm multiplied by 15cm multiplied by 20cm, which is convenient for observation.
The stirring device 1 comprises a speed-controllable automatic stirrer 1.1 and an automatic lifting stirring rod 1.2, the automatic lifting stirring rod 1.2 is connected with the speed-controllable automatic stirrer 1.1, the speed-controllable automatic stirrer 1.1 drives the automatic lifting stirring rod 1.2 to move up and down and rotate, a stirring head 1.3 is arranged at the lower end of the automatic lifting stirring rod 1.2, a grouting pipe 1.4 is arranged on the automatic lifting stirring rod 1.2, the grouting pipe 1.4 is positioned above the stirring head 1.3, and the stirring head 1.3 is positioned above the stirring forming device 2.3; when in use, the stirring head 1.3 enters the first soil layer 2.1 and the second soil layer 2.2 in the stirring and forming device 2.3 under the driving of the automatic lifting stirring rod 1.2. The side wall of the stirring and forming device 2.3 is provided with a plurality of through holes 2.6.
The water inlet device 3 and the water outlet device 4 are respectively arranged on two sides of the organic glass box 2.5, and the water inlet device 3 and the water outlet device 4 are respectively communicated with the inside of the organic glass box 2.5. The water inlet device 3 comprises a water inlet pipe 3.1 and a flow meter 3.2, the water inlet pipe 3.1 is introduced into the organic glass box 2.5, and the flow meter 3.2 is arranged on the water inlet pipe 3.1.
The stirring head adopts three groups of steel blades, and the included angle between every two blades is 60 degrees. The length of the stirring head (1.3) is less than the diameter of the stirring forming device (2.3). Three groups of steel blades of the stirring head (1.3) have the following sizes: the diameter of the first blade is d1, the length of d1 is 10-20cm, the diameter of the second blade is d2, the length of d2 is 8-16cm, the diameter of the third blade is d3, the length of d3 is mainly 4-8cm, and d1 is greater than d2 and greater than d3.
A use method of a stirring pile test device for indoor simulation of underground water flow comprises the following steps:
(1) Preparing a cement-based curing agent: one or more of metakaolin, water glass, gypsum, triethanolamine or sodium carbonate is mixed as an auxiliary agent, and the auxiliary agent is mixed into the cement, wherein the mixing amount is 5-20% of the cement, so that a cement-based curing agent is formed; the auxiliary agent is mixed into the cement, and the mixing amount is preferably 10% of the cement;
(2) Water movement simulation operation: the switch of the water inlet pipe is turned on, excessive water flows out through the water outlet pipe, the water flow speed is adjusted to be v1, and the construction process of the mixing pile is simulated at the flow speed;
(3) Stirring operation: adjusting the speed of a speed-controllable automatic stirrer and the height of an automatic lifting stirring rod, just placing a stirring head and a grouting pipe on the surface of a soil layer in a stirring pile forming device, simulating the two-spraying and four-stirring process in a construction site, spraying a cement-based curing agent when the stirring head is lifted, and mixing the cement-based curing agent and the soil layer to form slurry;
(4) Recording: observing the flowing process of the slurry, recording the scale value and time of the flowing of the slurry, drawing a flowing track diagram, screening the slurry proportion with slow diffusion and fast coagulation according to the result, and providing effective and sufficient data for engineering construction.
The speed regulating range of the speed-controllable automatic stirrer 11 is controlled to be 0-2000 r/min, and the speed can be positively and negatively rotated.
Preferably, the automatic lifting stirring rod 12 can be lifted automatically, the lifting control height range is 0-40 cm, and the process of drilling the stirring pile into the slurry on site can be simulated.
The method also comprises the following steps of preparing soil layers before use: according to the water content and the category of the soil sample under the actual working condition, the soil samples with different properties are respectively filled into the underground environment simulation device, the water content of the soil sample is about 60%, the soil samples are filled into the stirring pile forming device from inside to outside, layering compaction is carried out until the set height is reached, and a soil layer I and a soil layer II are formed after filling, wherein the height is 10cm. The first soil layer is fine sand, and the second soil layer is clay.
Proportioning the slurry: one or more of metakaolin, water glass, gypsum, triethanolamine or sodium carbonate is used as an auxiliary agent and is doped into cement, the doping amount is about 10 percent of the cement to form a cement-based curing agent, the setting time can be shortened, the doping amount of the cement-based curing agent is 15 percent of the mass of wet soil, the water-cement ratio is controlled to be 0.55, different slurry proportions are designed, and one proportion is injected in each test.
The proportioning scheme is as follows:
(1) 42.5 the mixing amount of the ordinary Portland cement is 15 percent
(2) 42.5 percent of ordinary portland cement and 1.5 percent of metakaolin
(3) 42.5 percent of common Portland cement and 1.5 percent of water glass
(4) 42.5 percent of common Portland cement and 1.5 percent of gypsum
(5) 42.5 percent of common Portland cement and 1.5 percent of sodium silicate
(6) 42.5 percent of ordinary portland cement mixing amount 15 percent + 1.5 percent of sodium carbonate
(7) 42.5 percent of common Portland cement and 0.5 percent of calcium chloride
(8) 42.5 percent of ordinary portland cement and 0.05 percent of triethanolamine
The slurry ratios for each run are reported as follows:
from the table data, the mixing pile test device for simulating underground water flow indoors can clearly know the slurry diffusion condition of a fine sand layer, and simultaneously, the setting time is controlled by the cement-based curing agent, so that the slurry diffusion condition under the condition of running water is improved.
The above embodiments are described in connection with the accompanying drawings, but the invention is not limited thereto, and it should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the spirit of the invention, and these changes and modifications are within the scope of the invention.
Claims (8)
1. The utility model provides an indoor simulation groundwater flow's stirring stake test device which characterized in that: comprises a stirring device (1), an underground environment simulation device (2), a water inlet device (3) and a water outlet device (4);
the underground environment simulation device (2) comprises a stirring forming device (2.3) and an organic glass box (2.5), the stirring forming device (2.3) is vertically installed in the organic glass box (2.5), the stirring forming device (2.3) and the organic glass box (2.5) are sequentially filled with a first soil layer (2.1) and a second soil layer (2.2) from bottom to top, and the length, the width and the height of the organic glass box (2.5) are respectively provided with a scale (2.4);
the stirring device (1) comprises a speed-controllable automatic stirrer (1.1) and an automatic lifting stirring rod (1.2), the automatic lifting stirring rod (1.2) is connected with the speed-controllable automatic stirrer (1.1), the lower end of the automatic lifting stirring rod (1.2) is provided with a stirring head (1.3), the automatic lifting stirring rod (1.2) is provided with a grouting pipe (1.4), and the stirring head (1.3) is positioned above the stirring and forming device (2.3);
the water inlet device (3) and the water outlet device (4) are respectively arranged on two sides of the organic glass box (2.5), and the water inlet device (3) and the water outlet device (4) are respectively communicated with the interior of the organic glass box (2.5).
2. The mixing pile test device for indoor simulation of underground water flow according to claim 1, characterized in that: the stirring forming device (2.3) is a glass cylinder, and the side wall of the glass cylinder is provided with a plurality of through holes (2.6).
3. The mixing pile test device for indoor simulation of underground water flow according to claim 2, characterized in that: the stirring head (1.3) adopts three groups of steel blades, and the included angle between every two groups is 60 degrees.
4. The mixing pile test device for indoor simulation of underground water flow according to claim 3, characterized in that: the length of the stirring head (1.3) is smaller than the diameter of the stirring forming device (2.3).
5. The mixing pile test device for indoor simulation of underground water flow according to claim 4, characterized in that: three groups of steel blades of the stirring head (1.3) have the following sizes: the diameter of the first blade is d1, the length of d1 is 10-20cm, the diameter of the second blade is d2, the length of d2 is 8-16cm, the diameter of the third blade is d3, the length of d3 is mainly 4-8cm, and d1 is greater than d2 and greater than d3.
6. The mixing pile test device for indoor simulation of underground water flow according to claim 1, characterized in that: the water inlet device (3) comprises a water inlet pipe (3.1) and a flow meter (3.2), the water inlet pipe (3.1) is introduced into the organic glass box (2.5), and the flow meter (3.2) is arranged on the water inlet pipe (3.1).
7. The use method of the mixing pile test device for simulating underground water flow indoors according to claim 1 is characterized by comprising the following steps:
(1) Preparing a cement-based curing agent: one or more of metakaolin, water glass, gypsum, triethanolamine or sodium carbonate is mixed as an auxiliary agent, and the auxiliary agent is mixed into the cement, wherein the mixing amount is 5-20% of the cement, so that a cement-based curing agent is formed;
(2) Water movement simulation operation: the switch of the water inlet pipe is turned on, excessive water flows out through the water outlet pipe, the water flow speed is adjusted to be v1, and the construction process of the mixing pile is simulated at the flow speed;
(3) Stirring operation: adjusting the speed of a speed-controllable automatic stirrer and the height of an automatic lifting stirring rod, just placing a stirring head and a grouting pipe on the surface of a soil layer in a stirring pile forming device, simulating the two-spraying and four-stirring process in a construction site, spraying a cement-based curing agent when the stirring head is lifted, and mixing the cement-based curing agent and the soil layer to form slurry;
(4) Recording: observing the flowing process of the slurry, recording the scale value and time of the flowing of the slurry, drawing a flowing track diagram, screening the slurry proportion with slow diffusion and fast coagulation according to the result, and providing effective and sufficient data for engineering construction.
8. The use method of the mixing pile test device for indoor simulation of underground water flow according to claim 7 is characterized in that:
and (2) in the step (1), the auxiliary agent is doped into the cement, and the doping amount is 10% of the cement.
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| CN107796929A (en) * | 2017-11-06 | 2018-03-13 | 华侨大学 | Elastic wave aids in cement ejection for water plugging model test apparatus |
| CN109212163A (en) * | 2018-09-14 | 2019-01-15 | 太原理工大学 | It is a kind of to study disturbance to the experimental provision and method of grouting for water blocking influential effect |
| CN112695813A (en) * | 2020-12-21 | 2021-04-23 | 山东大学 | Visual composite foundation piling technology model test device and method |
| CN113846705A (en) * | 2021-09-29 | 2021-12-28 | 北京中岩大地科技股份有限公司 | Model test method for dynamically monitoring stirring effect |
| CN216816399U (en) * | 2022-01-27 | 2022-06-24 | 西南交通大学 | Water-stopping effect test device of deep foundation pit water-stopping curtain |
| CN217998215U (en) * | 2022-08-16 | 2022-12-09 | 中国水利水电第七工程局有限公司 | Indoor stirring stake test device of simulation groundwater flow |
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