CN106759550B - Device and method for realizing lateral soil pressure in pile foundation model test - Google Patents
Device and method for realizing lateral soil pressure in pile foundation model test Download PDFInfo
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- CN106759550B CN106759550B CN201710029124.6A CN201710029124A CN106759550B CN 106759550 B CN106759550 B CN 106759550B CN 201710029124 A CN201710029124 A CN 201710029124A CN 106759550 B CN106759550 B CN 106759550B
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- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
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Abstract
The invention discloses a device for realizing lateral soil pressure in a pile foundation model test, which comprises a model box, a model pile, a plurality of lateral pressure transfer plates, a plurality of pressurizing devices and a plurality of soil pressure sensors, wherein the model pile, the lateral pressure transfer plates, the pressurizing devices and the soil pressure sensors are arranged in the model box; one side of each side pressure transfer plate is movably connected with the side wall of the model box, the side pressure transfer plates on two adjacent side walls of the model box are meshed and connected, and the pressurizing equipment is arranged between the side wall of the model box and the side pressure transfer plate on the side wall; the model pile is arranged in a space surrounded by the side pressure transfer plates, and the soil pressure sensor is arranged on the model pile. The invention does not need a centrifugal machine, and can realize the simulation of the actual lateral soil pressure field in the model test.
Description
Technical Field
The invention belongs to the technical field of pile foundation model tests in geotechnical engineering, and particularly relates to a device and a method for realizing lateral soil pressure in a pile foundation model test.
Background
In the problem of pile foundation engineering, a stress field generated by self weight often plays a leading role in deformation, strength and stability of a pile body structure and surrounding media. In a simulation test of similar materials considering self-weight, the model test and the prototype are required to be similar in material strength, volume weight, geometric dimension, denaturation property, stress state and the like, and certain constraint conditions are required to be met among all similarity ratios, so that the similar conditions are difficult to be met simultaneously. In order to obtain a specific stress field, a centrifuge test method is generally adopted, but in a pile foundation model test, in order to truly reflect the actual pile-soil interaction, pile side grouting effect and the like, the scale of the model test is small, so that the model is large in size and heavy in weight, the power capacity of the centrifuge cannot meet the test requirement, the lateral soil pressure in a soil body has important influence on the friction between pile soil and the shape of a pile soil cementing surface, and if the actual stress field cannot be obtained, the test result is difficult to evaluate the actual mechanical behavior and the engineering characteristics of an engineering prototype.
Therefore, the method and the device which do not need a centrifugal machine and can realize the actual lateral soil pressure field are developed, and the method and the device play an important role in development of pile foundation model tests.
Disclosure of Invention
In order to overcome the technical defects, the invention provides a device and a method for realizing lateral soil pressure in a pile foundation model test, which can realize an actual lateral soil pressure field without a centrifugal machine.
In order to solve the problems, the invention is realized according to the following technical scheme: a device for realizing lateral soil pressure in a pile foundation model test comprises a model box, a model pile, a plurality of lateral pressure transfer plates, a plurality of pressurizing devices and a plurality of soil pressure sensors, wherein the model pile, the lateral pressure transfer plates, the pressurizing devices and the soil pressure sensors are arranged in the model box; one side of each side pressure transfer plate is movably connected with the side wall of the model box, the side pressure transfer plates on two adjacent side walls of the model box are connected in a meshing manner, and the pressurizing equipment is arranged between the side wall of the model box and the side pressure transfer plate on the side wall; the model pile is arranged in a space surrounded by the side pressure transfer plates, and the soil pressure sensor is arranged on the model pile.
In particular, the pressurizing device is a pressurizing balloon.
Further, the side pressure transfer plate includes a set of opposite side, for the interlock limit, the interlock edge is crisscross to be equipped with a plurality of mortise and a plurality of tenon, side pressure transfer plate on two adjacent lateral walls of mold box passes through the interlock is realized to mortise and tenon.
Specifically, the connecting edge of the side pressure transfer plate is movably connected with the side wall of the model box through a hinge.
Specifically, the mortise of the occlusion edge is gradually deeper in a direction from the connecting edge of the side pressure transfer plate to the opposite edge thereof.
Further, the adjacent pressurizing air bags are communicated with each other through an air pipe.
Specifically, the soil pressure sensors are arranged at intervals in the axial direction of the model pile.
Specifically, the soil pressure sensors are arranged around the model pile at equal angles on the same cross section of the model pile.
A method for realizing lateral soil pressure in a pile foundation model test comprises the following steps:
s1, applying side pressure transfer plates to the side walls of a mold box in the mold box, wherein one side of each side pressure transfer plate is movably connected with the mold box, and the side pressure transfer plates on two adjacent side walls of the mold box are in snap-fit connection;
s2, arranging a pressurizing air bag between the side wall of the model box and the side pressure transmission plate on the side wall;
s3, hoisting the model pile into a model box;
s4, filling soil, and arranging a plurality of soil pressure sensors on the model pile;
s5, inflating and pressurizing the pressurizing air bags, enabling the pressurizing air bags to abut against the lateral pressure transfer plates, enabling adjacent lateral pressure transfer plates to be deeply engaged and push the soil body in the model box, and enabling the lateral soil pressure borne by the model pile to be increased; and feedback of lateral soil pressure of the soil body is obtained through the soil pressure sensor on the model pile, and the lateral soil pressure of the soil body is regulated and controlled by regulating and controlling the pressure of the pressurizing air bag.
Compared with the prior art, the invention has the beneficial effects that: 1. according to the invention, the lateral pressure is applied to the soil body through the pressurizing equipment and the lateral pressure transfer plate, and the lateral soil pressure is fed back in real time by using the soil pressure sensor on the model pile, so that the state that the actual lateral soil pressure linearly changes along the depth can be accurately simulated, and the lateral soil pressure fields of different depths can be realized according to different test conditions, which has key influences on the research on the pile-soil interaction, the pile-side grouting effect, the shape of a pile-soil cemented surface and other problems in a pile foundation test; 2. the communication of the adjacent pressurizing air bags is beneficial to balancing the pressure of each air bag, and the model pile is evenly subjected to lateral soil pressure in each direction; 3. through set up the mortise and tenon that the slant changes at the two interlock edges of side pressure transfer board, realize embedding and interlock matching each other of two adjacent side pressure transfer boards in the pressurization process, both can avoid adjacent side pressure transfer board to remove the in-process and block each other, can prevent again simultaneously that the soil granule in the model case from spilling from the gap of the interlock department of side pressure transfer board.
Drawings
Embodiments of the invention are described in further detail below with reference to the attached drawing figures, wherein:
fig. 1 is a schematic structural view of the present invention.
FIG. 2 is a schematic view of the structure of the side pressure transfer plate of the present invention.
FIG. 3 is a schematic view showing the structure of another side pressure transfer plate of the present invention.
Fig. 4 is a diagram of a pressurized bladder arrangement of the present invention.
FIG. 5 is a connection diagram of the pressurizing airbag of the present invention.
In the figure: 1-a model box; 2-lateral transfer plate; 3-pressurizing the air bag; 4-model pile; 5-soil pressure sensor, 21-connecting edge; 22-a bite edge; 23-a swing edge; 25-a hinge; 27-mortise; 28-tenon; 34-trachea.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
Examples
As shown in fig. 1 to 5, the apparatus for realizing lateral soil pressure in a pile foundation model test according to the present embodiment includes a model box 1, four lateral pressure transmission plates 2, four pressurizing air bag 3 model piles 4, and a plurality of soil pressure sensors 5. The model pile 4, the four lateral pressure transmission plates 2, the four pressurizing air bags 3 and the plurality of soil pressure sensors 5 are arranged in the model box 1, and soil body fills the space in the model box 1.
As shown in fig. 2 and 3, fig. 2 and 3 show the side pressure transfer plates 2 engaged with each other. The side pressure transfer plate 2 is a square plate body, and has four sides, namely a connecting side 21, an engagement side 22, a swinging side 23 and another engagement side 22. On the same side pressure transfer plate 2, the connecting edge 21 and the swinging edge 23 form a pair of opposite edges, and the two engaging edges 22 form a pair of opposite edges. The connecting edge 21 is provided with a hinge 25, the occlusion edge 22 is provided with a plurality of tenons 28 and mortises 27, and the tenons 28 and the mortises 27 are arranged in a staggered manner. Further, the mortise 27 of the engaging side 22 is gradually deeper in the direction from the connecting side 21 to the swing side 23, and specifically, the deeper the mortise 27 closer to the swing side 23, the deeper the mortise 27 closer to the connecting side 21. The four side pressure transmission plates 2 correspond to the four side walls of the model box 1 one by one, and the connecting edges 21 of the side pressure transmission plates 2 are movably connected with the side walls of the model box 1 through hinges 25, so that the side pressure transmission plates 2 can rotate around the connecting edges 21. The adjacent side pressure transfer plates 2 are connected with each other through the occlusion edges 22, and the swing amplitude of the side pressure transfer plates 2 is limited by the size of the mortise 27 on the occlusion edges 22.
The four pressurizing air bags 3 correspond to the four side pressure transfer plates 2 one by one, and the pressurizing air bags 3 are arranged between the side wall of the model box 1 and the side pressure transfer plates 2 on the side wall. The adjacent pressurizing bladders 3 are communicated with each other through the air tube 34.
The model pile 4 is erected in the center of the model box 1, and is specifically a space surrounded by the four side pressure transfer plates 2. A plurality of soil pressure sensors 5 are axially and equidistantly arranged on the side wall of the model pile 4. On the same cross section of the model pile 4, a plurality of soil pressure sensors 5 are arranged in an equiangular surrounding manner.
The working principle of realizing lateral soil pressure in the pile foundation model test described in this embodiment is as follows: by inflating and pressurizing the pressurizing air bag 3, the pressurizing air bag 3 is abutted against the side pressure transfer plates 2, the swinging edges 23 of the side pressure transfer plates 2 swing towards the interior of the model box 1, the adjacent side pressure transfer plates 2 are deepened to be occluded and push the soil body in the model box 1, so that the lateral soil pressure borne by the model pile 4 is increased. The inflation pressure of the pressurizing air bag 3 is controlled by observing the soil pressure sensor 5 on the model pile 4, so that the lateral soil pressure of the soil body reaches the test requirement.
The method for realizing lateral soil pressure in the pile foundation model test comprises the following steps:
s1, the side pressure transmitting plate 2 is set,
the four side walls of the model box 1 are respectively provided with a side pressure transmission plate 2, the side pressure transmission plates 2 are applied on the side walls of the model box 1, the side pressure transmission plates 2 are movably connected with the model box 1 through hinges 25 on connecting edges 21 of the side pressure transmission plates, and the adjacent side pressure transmission plates 2 are connected with each other through occlusion edges 22 of the side pressure transmission plates;
s2, the pressurizing airbag 3 is set,
the four side walls of the model box 1 are respectively provided with a pressurizing air bag 3, the pressurizing air bags 3 are arranged between the side walls of the model box 1 and the side pressure transfer plates 2 on the side walls, and the adjacent pressurizing air bags 3 are communicated through air pipes 34;
s3, setting the model pile 4,
hoisting the model pile 4 into the model box 1;
and S4, filling the soil,
filling soil to the model box 1 layer by layer to be compact, and arranging a plurality of soil pressure sensors 5 on the model pile 4, wherein the side wall of the model pile 4 is axially and equidistantly provided with the plurality of soil pressure sensors 5, and the plurality of soil pressure sensors 5 are arranged on the same cross section of the model pile 4 in an equiangular surrounding manner;
s5, the pressurizing airbag 3 is inflated,
inflating and pressurizing the pressurizing air bags 3, enabling the pressurizing air bags 3 to abut against the side pressure transfer plates 2, deepening occlusion of the adjacent side pressure transfer plates 2, and pushing the soil body in the model box 1 to increase the side soil pressure borne by the model piles 4; the inflation pressure of the pressurization air bag 3 is controlled by observing the soil pressure sensor 5 on the model pile 4, so that the lateral soil pressure of the soil body reaches the test requirement.
Therefore, the swing amplitude of the side pressure transfer plates is limited by the size of the mortise of the side pressure transfer plates and the size of the mortise of two adjacent side pressure transfer plates. In the preferred embodiment, the mortise gradient of the occlusion edge is gradually deeper from the connecting edge of the side pressure transmission plates to the swinging edge, so that two adjacent side pressure transmission plates can be matched and connected when the side pressure transmission plates swing. In other embodiments, the mortise on the same occlusion edge is not limited to a gradient arrangement with a gradually deeper depth as long as the lateral pressure transmitting plate is provided with a sufficient depth to satisfy the swinging of the lateral pressure transmitting plate. And according to different soil body requirements, the mortise depth and the size of the tenon can be adjusted, and the matching occlusion of the two adjacent side pressure transfer plates is taken as the standard. In the embodiment, the obliquely-changed mortises and tenons are arranged on the two occlusion edges of the side pressure transfer plates, so that the two adjacent side pressure transfer plates are embedded and occluded in a matching manner in the pressurizing process, the adjacent side pressure transfer plates can be prevented from blocking each other in the moving process, and soil particles in the model box can be prevented from leaking out of gaps at the occlusion positions of the side pressure transfer plates.
Compared with the prior art, the invention does not need to rely on a centrifuge, does not have the defects of insufficient power and the like of a centrifuge test method, applies lateral pressure to a soil body through the air bag and the lateral pressure transfer plate, and feeds back the lateral soil pressure in real time by using the soil pressure sensor on the model pile, can accurately simulate the state that the actual lateral soil pressure linearly changes along the depth, and can realize lateral soil pressure fields with different depths according to different test conditions, thereby having key influence on the research on the problems of pile-soil interaction, pile-side grouting effect, pile-soil cement surface shape and the like in a pile foundation test.
And the communication of the adjacent pressurizing air bags is beneficial to balancing the pressure of each air bag, so that the model pile is evenly subjected to lateral soil pressure in each direction.
Other structures of the device and the method for realizing lateral soil pressure in the pile foundation model test are disclosed in the embodiment and refer to the prior art.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, so that any modification, equivalent change and modification made to the above embodiment according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.
Claims (4)
1. The utility model provides a realize device of side direction soil pressure among pile foundation model test which characterized in that: the device comprises a model box, a model pile, a plurality of side pressure transfer plates, a plurality of pressurizing devices and a plurality of soil pressure sensors, wherein the model pile, the side pressure transfer plates, the pressurizing devices and the soil pressure sensors are arranged in the model box; one side of each side pressure transfer plate is movably connected with the side wall of the model box, the side pressure transfer plates on two adjacent side walls of the model box are connected in a meshing manner, and the pressurizing equipment is arranged between the side wall of the model box and the side pressure transfer plate on the side wall; the model pile is arranged in a space surrounded by the side pressure transfer plates, and the soil pressure sensor is arranged on the model pile;
the side pressure transfer plates comprise a group of opposite sides which are occlusion sides, a plurality of mortises and a plurality of tenons are arranged on the occlusion sides in a staggered mode, and the side pressure transfer plates on two adjacent side walls of the model box are occluded through the mortises and the tenons; in the direction from the connecting edge of the side pressure transfer plate to the opposite edge of the side pressure transfer plate, the mortise of the occlusion edge is gradually deep; the connecting edge of the side pressure transfer plate is movably connected with the side wall of the model box through a hinge;
the pressurizing device is a pressurizing air bag; the adjacent pressurizing air bags are communicated with each other through air pipes.
2. The device for realizing lateral soil pressure in the pile foundation model test according to claim 1, characterized in that: the soil pressure sensors are arranged at intervals in the axial direction of the model pile.
3. The device for realizing lateral soil pressure in the pile foundation model test according to claim 2, characterized in that: the soil pressure sensors are arranged on the same cross section of the model pile in an equiangular surrounding mode.
4. A test method of the device for realizing lateral soil pressure in the pile foundation model test of claim 1 is characterized by comprising the following steps:
s1, applying side pressure transfer plates on the side walls of a model box in the model box, wherein one edge of each side pressure transfer plate is movably connected with the model box, and the side pressure transfer plates on two adjacent side walls of the model box are in meshing connection;
s2, arranging pressurizing air bags between the side wall of the model box and the side pressure transfer plate on the side wall, wherein two adjacent pressurizing air bags are communicated through an air pipe;
s3, hoisting the model pile into a model box;
s4, filling soil, and arranging a plurality of soil pressure sensors on the model pile;
s5, inflating and pressurizing the pressurizing air bags, enabling the pressurizing air bags to abut against the lateral pressure transfer plates, enabling adjacent lateral pressure transfer plates to be deeply engaged and push the soil body in the model box, and enabling the lateral soil pressure borne by the model pile to be increased; and feedback of lateral soil pressure of the soil body is obtained through the soil pressure sensor on the model pile, and the lateral soil pressure of the soil body is regulated and controlled by regulating and controlling the pressure of the pressurizing air bag.
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| CN201710029124.6A CN106759550B (en) | 2017-01-16 | 2017-01-16 | Device and method for realizing lateral soil pressure in pile foundation model test |
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| CN109403393A (en) * | 2018-11-12 | 2019-03-01 | 北京交通大学 | Simulate pile body stress and the experimental rig of durability monitoring under friction pile use environment |
| CN110185068B (en) * | 2019-05-10 | 2020-06-02 | 河海大学 | Reduced scale model test device capable of simulating stress state of prototype pile foundation |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104074210A (en) * | 2014-07-15 | 2014-10-01 | 中铁第一勘察设计院集团有限公司 | Pile foundation side friction indoor testing device and testing method thereof |
| CN105649123A (en) * | 2016-03-21 | 2016-06-08 | 青岛理工大学琴岛学院 | Model testing method simulating influence of pile side radial stress on pile body axial stress |
| CN105756106A (en) * | 2016-04-30 | 2016-07-13 | 山东大学 | Centrifugal experiment model test system for simulating vertical load transmission mechanism of composite foundation |
| CN206428734U (en) * | 2017-01-16 | 2017-08-22 | 广州市建筑科学研究院有限公司 | The device of soil lateral pressure is realized in a kind of pile foundation model test |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20060088386A1 (en) * | 2004-10-26 | 2006-04-27 | William Ellis | Piling and pole protective wrap system |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104074210A (en) * | 2014-07-15 | 2014-10-01 | 中铁第一勘察设计院集团有限公司 | Pile foundation side friction indoor testing device and testing method thereof |
| CN105649123A (en) * | 2016-03-21 | 2016-06-08 | 青岛理工大学琴岛学院 | Model testing method simulating influence of pile side radial stress on pile body axial stress |
| CN105756106A (en) * | 2016-04-30 | 2016-07-13 | 山东大学 | Centrifugal experiment model test system for simulating vertical load transmission mechanism of composite foundation |
| CN206428734U (en) * | 2017-01-16 | 2017-08-22 | 广州市建筑科学研究院有限公司 | The device of soil lateral pressure is realized in a kind of pile foundation model test |
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