CN115262662A - Suspension type cement mixing pile composite foundation indoor model test device - Google Patents
Suspension type cement mixing pile composite foundation indoor model test device Download PDFInfo
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- CN115262662A CN115262662A CN202210714525.6A CN202210714525A CN115262662A CN 115262662 A CN115262662 A CN 115262662A CN 202210714525 A CN202210714525 A CN 202210714525A CN 115262662 A CN115262662 A CN 115262662A
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- suspension type
- type cement
- cement mixing
- composite foundation
- mixing pile
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- 239000004568 cement Substances 0.000 title claims abstract description 61
- 239000000725 suspension Substances 0.000 title claims abstract description 55
- 238000002156 mixing Methods 0.000 title claims abstract description 48
- 239000002131 composite material Substances 0.000 title claims abstract description 46
- 238000012360 testing method Methods 0.000 title claims abstract description 30
- 230000005540 biological transmission Effects 0.000 claims abstract description 9
- 239000002689 soil Substances 0.000 claims description 35
- 239000010720 hydraulic oil Substances 0.000 claims description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 20
- 239000011148 porous material Substances 0.000 claims description 16
- 238000006073 displacement reaction Methods 0.000 claims description 15
- 238000003756 stirring Methods 0.000 claims description 9
- 239000004576 sand Substances 0.000 claims description 8
- 239000003921 oil Substances 0.000 claims description 6
- 238000012544 monitoring process Methods 0.000 abstract 1
- 239000002002 slurry Substances 0.000 description 4
- 229920006395 saturated elastomer Polymers 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000004746 geotextile Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003415 peat Substances 0.000 description 1
Images
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
Abstract
The invention relates to the technical field of civil engineering, and discloses a suspension type cement mixing pile composite foundation indoor model test device, which comprises a suspension type cement mixing pile composite foundation model box device, a servo control system and a pressure loading device, wherein the suspension type cement mixing pile composite foundation model box device comprises a rigid model box and a rigid base, the rigid model box is fixedly arranged on the top surface of the rigid base, a self-balancing frame is fixedly arranged on the top surface of the rigid base, the pressure loading device is arranged above the suspension type cement mixing pile composite foundation model box device, the servo control system comprises a computer and a power controller, the computer and the power controller are in data connection through data transmission lines, the pressure sensor is used for monitoring the pressure of the pressure loading device, and the pressure borne by the suspension type cement mixing pile composite foundation model is accurately controlled through the servo controller; the computer is provided with data processing software, and can effectively collect various data.
Description
Technical Field
The invention relates to the technical field of civil engineering, in particular to a suspension type cement mixing pile composite foundation indoor model test device.
Background
In various projects such as water conservancy and hydropower projects, railway and highway construction projects, civil engineering projects, offshore projects and the like, when various saturated soft clays such as silt, mucky soil, silt soil, sandy soil, peat soil and the like are used as foundations, the requirement of the bearing capacity of the foundations required by buildings cannot be met, so that the bearing capacity of soft soil foundations needs to be reinforced by using the suspension type cement mixing piles, and the suspension type cement mixing pile composite foundations have the advantages of wide soil property types, great utilization of original soil foundations, short construction period, low cost, flexible design and the like and are very wide in application.
Due to the wide application of the suspension type cement mixing pile composite foundation, the research on the suspension type cement mixing pile composite foundation is very necessary. In order to research the change laws of soil body settlement, deformation, pile body load sharing ratio, hyperstatic pore water pressure dissipation and the like of the suspension type cement mixing pile composite foundation, an indoor model test device which is safe, reliable, simple in structure and accurate in data is urgently needed.
Therefore, the suspension type cement mixing pile composite foundation indoor model test device is provided.
Disclosure of Invention
The invention mainly solves the technical problems in the prior art and provides a suspension type cement mixing pile composite foundation indoor model test device.
In order to achieve the above purpose, the present invention adopts the following technical scheme that the indoor model test device for the suspension type cement mixing pile composite foundation comprises a suspension type cement mixing pile composite foundation model box device, a servo control system and a pressure loading device, wherein the suspension type cement mixing pile composite foundation model box device comprises a rigid model box and a rigid base, the rigid model box is fixedly installed on the top surface of the rigid base, a self-balancing frame is fixedly installed on the top surface of the rigid base, the pressure loading device is arranged above the suspension type cement mixing pile composite foundation model box device, the servo control system comprises a computer and a power controller, and the computer and the power controller are in data connection through a data transmission line.
Further, the pressure loading device comprises a hydraulic oil cylinder, a pressure sensor, a high-precision displacement sensor (LVDT) and a rigid loading plate, the pressure sensor is fixedly installed at the top of the self-balancing frame, the bottom end face of the pressure sensor is fixedly connected with the top end face of the hydraulic oil cylinder, a piston loader is fixedly installed in the hydraulic oil cylinder, the output end of the hydraulic oil cylinder is fixedly connected with the rigid loading plate, one end of the high-precision displacement sensor (LVDT) is fixedly connected with the inner top of the self-balancing frame, the other end of the high-precision displacement sensor (LVDT) is fixedly connected with the back face of the rigid loading plate, small water discharge holes are uniformly formed in the surface of the rigid loading plate, a hydraulic oil circuit is fixedly installed on the left side of the hydraulic oil cylinder, an oil pump is fixedly connected with one end of the hydraulic oil circuit, the oil pump is connected with the power controller through the same data transmission line, and the pressure sensor and the high-precision displacement sensor (LVDT) are connected with the servo control system through the same data transmission line.
Further, the rigid model box is wholly in a circular ring shape, the rigid model box and the rigid base form a cylindrical shape with an open top, the round through is filled with a test soil body, injected cement slurry is mixed with the test soil body, a suspension type cement stirring pile is formed in the cylindrical shape, a sand cushion layer is laid on the suspension type cement stirring pile, the thickness of the sand cushion layer is 5cm, and equipment instruments such as a high-precision pore water pressure gauge, a soil pressure box and the like for measuring hyperstatic pore water pressure and soil pressure are laid in the rigid model box.
Further, a rigid model box in the suspension type cement mixing pile composite foundation model box device is in a regular cuboid shape or a cylindrical barrel shape.
Further, the suspension type cement mixing piles are arranged in a single pile or grouped piles mode.
Further, the suspension type cement mixing piles are arranged in a single row or multiple rows when grouped piles are arranged.
Further, when the suspension type cement mixing piles are arranged in a grouped pile multi-row arrangement mode, parallel arrangement, symmetrical arrangement or linear cross arrangement is adopted.
Advantageous effects
The invention provides a suspension type cement mixing pile composite foundation indoor model test device. The method has the following beneficial effects:
(1) The suspension type cement mixing pile composite foundation indoor model test device is convenient for researching the change laws such as soil body settlement, deformation, pile body load sharing ratio and hyperstatic pore water pressure dissipation of the suspension type cement mixing pile composite foundation, and is safe and reliable, simple in structure and accurate in data.
(2) This suspension type cement mixing pile composite foundation indoor model test device reciprocates through the piston loader in the hydraulic cylinder, carries out the loading and unloading of axial force to the rigid loading board through pressure loading device, and accurate application pressure.
(3) This indoor model test device of suspension type cement stirring stake composite foundation through high accuracy pore water pressure gauge and the soil pressure cell that sets up in the suspension type cement stirring stake composite foundation model case, can the accurate measurement soil body warp displacement data to reachs accurate soil body settlement value.
Drawings
The structures, proportions, sizes, and other dimensions shown in the specification are for illustrative purposes only and are not intended to limit the scope of the present invention, which is defined in the claims, since they are not intended to limit the scope of the present invention.
FIG. 1 is a schematic view of an indoor model test device for a suspension type cement mixing pile composite foundation of the invention;
FIG. 2 is an enlarged view of a suspended cement mixing pile composite foundation model box device and a pressure loading device;
FIG. 3 is a schematic top view of the composite foundation model box assembly and rigid load plate of the present invention;
fig. 4 is a schematic top view of the composite foundation mold box device when the suspension type cement mixing piles of the present invention are arranged in parallel.
Illustration of the drawings:
1. a rigid mold box; 2. a rigid base; 3. a high precision pore water pressure gauge; 4. a soil pressure cell; 5. a rigid load plate; 6. a pressure sensor; 7. high precision displacement transducers (LVDTs); 8. a hydraulic cylinder; 9. a piston loader; 10. a computer; 11. a power controller; 13. testing soil body; 14. a data transmission line; 15. a self-balancing frame; 17. a sand cushion layer; 18. suspension type cement mixing piles; 20. a small drainage hole; 21. a hydraulic oil circuit; 22. an oil pump.
Detailed Description
The invention provides a suspension type cement mixing pile composite foundation indoor model test device, which comprises a rigid model box 1, a rigid base 2, a high-precision pore water pressure meter 3, a soil pressure box 4, a rigid loading plate 5, a pressure sensor 6, a high-precision displacement sensor (LVDT) 7, a hydraulic oil cylinder 8, a piston loader 9, a computer 10, a power controller 11, a test soil body 13, a data transmission line 14, a self-balancing frame 15, a sand cushion layer 17, a suspension type cement mixing pile 18, a small water drainage hole 20, a hydraulic oil circuit 21 and an oil pump 22, and is shown in figures 1-4.
The suspension type cement mixing pile composite foundation model box device comprises a rigid model box 1, a rigid base 2 and a servo control system, wherein the rigid model box 1 is smooth in interior and has a certain thickness, the rigid model box 1 and the rigid base 2 form a space with only an upper opening, a high-precision pore water pressure gauge 3 and a soil pressure box 4 are embedded in the model box device in a layering mode during soil filling, and the high-precision pore water pressure gauge 3 and the soil pressure box 4 are connected with the servo control system; the upper part of the suspension type cement mixing pile composite foundation model box device is connected with a pressure loading device, the pressure loading device comprises a rigid loading plate 5, a pressure sensor 6 and a high-precision displacement sensor (LVDT) 7, the pressure sensor 6 and the high-precision displacement sensor (LVDT) 7 are connected with a servo control system, the rigid loading plate 5 of the pressure loading device is loaded and unloaded by axial force by moving up and down through a piston loader 9 in a hydraulic oil cylinder 8, and a plurality of small holes are drilled in the rigid loading plate 5 and used for draining water after the composite foundation is pressed; the servo control system comprises a computer 10 and a power controller 11, and the computer 10 is provided with data processing software and can effectively collect various data.
The working principle of the invention is as follows: before the test, the saturated soil body 13 to be tested is loaded into the rigid model box 1 in layers, a high-precision pore water pressure gauge 3 and a soil pressure box 4 are paved in layers, after the saturated soil is filled, cement slurry is injected into the required position by using a stirring device, and the cement slurry is mixed with the surrounding soil body to form a suspension type cement stirring pile 18; standing for 7 days to harden the cement slurry between the pile body and the surrounding soft soil, then placing two layers of geotextile on the top of the composite foundation, and paving a sand cushion layer 17 with the thickness of 5 cm.
During the test, the servo controller controls the piston loader 9 in the hydraulic oil cylinder 8 to move downwards to load the axial force on the rigid loading plate 5 of the pressure loading device, and the axial force of 5kPa is loaded initially; then recording the settlement and the pore water pressure change in the prepressing process, continuing to load after the pore water pressure in the soil dissipates 90 percent, wherein the loading pressure is freely controlled according to the test requirement, generally graded loading is carried out, and the time interval is 24 hours; and recording the change rules of the settlement (displacement value), the soil stress and the hyperstatic pore water pressure of the composite foundation under all levels of loads.
After the test is finished, the piston loader 9 in the hydraulic oil cylinder 8 is controlled by the servo controller to move upwards, the rigid loading plate 5 of the pressure loading device is unloaded, the sand cushion layer 17, the soil pressure box 4, the high-precision pore water pressure gauge 3 and the like are sequentially taken down, the rigid model box 1 is cleaned, and the next test is prepared.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed.
Claims (7)
1. The utility model provides an indoor model test device of suspension type cement stirring stake composite foundation which characterized in that: including suspension type cement mixing pile composite foundation model case device, servo control system and pressure loading device, suspension type cement mixing pile composite foundation model case device includes rigid model case (1) and rigid base (2), rigid model case (1) fixed mounting is at the top surface of rigid base (2), the top surface fixed mounting of rigid base (2) has self-balancing frame (15), pressure loading device sets up suspension type cement mixing pile composite foundation model case device top, servo control system includes computer (10) and power controller (11), carry out data connection through data transmission line (14) between computer (10) and power controller (11).
2. The suspension type cement mixing pile composite foundation indoor model test device of claim 1, characterized in that: the pressure loading device comprises a hydraulic oil cylinder (8), a pressure sensor (6), a high-precision displacement sensor (LVDT) (7) and a rigid loading plate (5), wherein the pressure sensor (6) is fixedly installed at the top of a self-balancing frame (15), the bottom end face of the pressure sensor (6) is fixedly connected with the top end face of the hydraulic oil cylinder (8), a piston loader (9) is fixedly installed in the hydraulic oil cylinder (8), the output end of the hydraulic oil cylinder (8) is fixedly connected with the rigid loading plate (5), one end of the high-precision displacement sensor (LVDT) (7) is fixedly connected with the inner top of the self-balancing frame (15), the other end of the high-precision displacement sensor (LVDT) (7) is fixedly connected with the back face of the rigid loading plate (5), hydraulic oil cylinder drainage small holes (20) are uniformly formed in the surface of the rigid loading plate (5), a hydraulic oil circuit (21) is fixedly installed on the left side of the high-precision displacement sensor (8), one end of the hydraulic oil circuit (21) is fixedly connected with an oil pump (22), the oil pump (22) is connected with a power controller (11) through the same data transmission line (14), and the pressure sensor (6) and the high-precision displacement sensor (7) are connected with a servo control system through the same data transmission line (14).
3. The suspension type cement mixing pile composite foundation indoor model test device of claim 1, characterized in that: the rigidity mold box (1) is wholly a ring form, and rigidity mold box (1) constitutes a open-top's cask form with rigidity base (2), the round is led to and is filled with experimental soil body (13), injects cement paste and mixes with experimental soil body (13), forms suspension type cement stirring stake (18) in the cask, sand cushion layer (17) have been laid to suspension type cement stirring stake (18), the thickness of sand cushion layer (17) is 5cm, equipment instruments that are used for measuring hyperstatic pore water pressure and soil pressure such as high accuracy pore water pressure gauge (3) and soil pressure box (4) have been laid in rigidity mold box (1).
4. The suspension type cement mixing pile composite foundation indoor model test device of claim 1, characterized in that: a rigid model box (1) in the suspension type cement mixing pile composite foundation model box device is in a regular cuboid shape or a cylindrical barrel shape.
5. The suspension type cement mixing pile composite foundation indoor model test device of claim 3, characterized in that: the suspension type cement mixing piles (18) are arranged in a single pile or grouped piles mode.
6. The indoor model test device of suspension type cement mixing pile composite foundation of claim 3, characterized in that: the suspension type cement mixing piles (18) are arranged in a single row or multiple rows when arranged in a grouped pile mode.
7. The suspension type cement mixing pile composite foundation indoor model test device of claim 3, characterized in that: the suspension type cement mixing piles (18) are arranged in parallel, symmetrically or linearly and crossly when arranged in a multi-row manner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210714525.6A CN115262662A (en) | 2022-06-23 | 2022-06-23 | Suspension type cement mixing pile composite foundation indoor model test device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210714525.6A CN115262662A (en) | 2022-06-23 | 2022-06-23 | Suspension type cement mixing pile composite foundation indoor model test device |
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2022
- 2022-06-23 CN CN202210714525.6A patent/CN115262662A/en active Pending
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