CN210262999U - Foundation plasticity district contactless testing arrangement based on PIV technique - Google Patents
Foundation plasticity district contactless testing arrangement based on PIV technique Download PDFInfo
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- CN210262999U CN210262999U CN201920959112.8U CN201920959112U CN210262999U CN 210262999 U CN210262999 U CN 210262999U CN 201920959112 U CN201920959112 U CN 201920959112U CN 210262999 U CN210262999 U CN 210262999U
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Abstract
The utility model discloses a ground plastic zone contactless testing device based on PIV technology, which comprises a testing device, wherein the testing device consists of a ground model box and a vertical loading device, the ground model box comprises a base, the top end of the base is fixedly provided with the model box, the front side of the model box is embedded and connected with transparent toughened glass through a window which is arranged, the inside of the model box is filled with soil mass, the vertical loading device comprises a jack, one end of the jack is movably connected with a pressure sensor, and the bottom end of the pressure sensor is movably connected with a strip-shaped steel plate, the utility model has the advantages that the device fills the blank of the domestic ground plastic zone testing instrument market, adopts a digital display type load reading instrument to obtain the load size of the ground, obtains the ground soil body displacement field through the PIV technology, does not need to embed a soil pressure gauge and a displacement meter, and basically can eliminate the artificial disturbance of the ground soil, the material cost, the workload and the like of the model test are reduced, and accidental errors caused by manual introduction in the traditional test are eliminated.
Description
Technical Field
The utility model relates to a testing arrangement, in particular to ground plasticity district contactless testing arrangement based on PIV technique.
Background
The piv (particle Image velocimetry) technology, also called particle Image velocimetry, is a transient, multipoint and contactless fluid mechanics velocimetry method developed in the last 70 th century. The White provides an improved GeoPIV technology based on a PIV algorithm, and the software is non-commercial software at present, can be obtained freely and is widely used for non-contact deformation measurement of soil bodies in geotechnical tests. According to the technology, a series of photos are continuously shot in real time through a high-definition digital camera, all the photos are subjected to digital processing through GeoPIV software, and a quantitative displacement field in a soil body and a visual dynamic development process of the quantitative displacement field are obtained through continuous analysis of two successive frames of digital images.
The foundation plasticity zone is a local shearing destruction zone in a foundation, is an important concept in the courses of soil mechanics, and is a design value of foundation bearing capacity determined based on a boundary equation of the foundation plasticity zone in the design Specification of building foundation design GB50007-2011 in China. At present, the research on the plastic zone of the ground is based on Mohr-Coulomb criterion and limit balance condition to deduce the boundary equation of the plastic zone of the ground, and draw the boundary track of the plastic zone according to the boundary equation, thereby determining the range and morphological characteristics of the plastic zone. Meanwhile, a theoretical calculation formula of the maximum depth Zmax is developed in the plastic zone by deriving a plastic boundary equation, and then corresponding base pressures, namely the plastic load pcr, the critical load p1/4 and the critical load p1/3, are respectively calculated by setting Zmax to 0, Zmax to 1/4b and Zmax to 1/3b (b is the base width), so as to serve as design values of the bearing capacity of the foundation in engineering design.
In the derivation of the above-mentioned boundary equation of the ground plasticity zone, the static side pressure coefficient k0 is assumed to be 1, that is, the self-weight stress of the soil body is considered as the hydrostatic stress, the stress is equal and has no shear stress in all directions at the same depth, and the side pressure coefficient of the measured foundation soil is generally between 0.35 and 0.80, so the assumption that k0 is 1 is obviously contrary to the engineering practice. To do this, the panelists generated a query such as "how plastic zone morphology and boundary features in the actual engineering ground? "is" consistent with the theoretical derivation under certain assumptions? "," can the dynamic development process of the ground plasticity zone be visually observed? "and the like. These problems have prompted the panelists to develop a concept of visually observing the ground plasticity zone device system through the model experiment device system, so that a ground plasticity zone contactless test device based on the PIV technology is provided, according to research and research, similar products do not exist in the domestic market at present, and the product fills the blank of domestic ground plasticity zone test instrument equipment.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a ground plasticity district contactless testing arrangement based on PIV technique to solve the problem that proposes in the above-mentioned background art.
In order to achieve the above object, the utility model provides a following technical scheme: the utility model provides a ground plasticity district contactless testing arrangement based on PIV technique, includes testing arrangement, testing arrangement comprises ground mold box and vertical loading device, the ground mold box includes the base, the positive middle part swing joint of base has drop-down door, the top fixed mounting of base has the mold box, the front of mold box inlays through the window of seting up and establishes and be connected with transparent toughened glass, the inside packing of mold box has the soil body, vertical loading device includes the jack, the one end swing joint of jack has pressure sensor, pressure sensor's bottom swing joint has the bar steel sheet.
As a preferred technical scheme of the utility model, testing arrangement still includes image acquisition and processing apparatus, image acquisition and processing apparatus include shadowless lamp, camera and computer, the shadowless lamp is located the both sides of camera, the camera is located transparent toughened glass's dead ahead, camera and computer signal connection, pressure sensor and computer electric connection.
As an optimal technical scheme of the utility model, the area of bar steel sheet is less than or equal to the one-third of the surface area of the soil body, just the bar steel sheet is located the middle part on soil body surface.
As an optimized technical scheme of the utility model, the fixed reaction roof beam that is equipped with a plurality of mutual parallels of uncovered department on mold box top.
As an optimal technical scheme of the utility model, the mold box is the steel construction cuboid, just the length, the width and the height of mold box are 1.6 meters, 0.6 meters and 1.4 meters respectively.
Compared with the prior art, the beneficial effects of the utility model are that:
1. the utility model discloses filled the blank in internal ground plasticity district test instrument equipment, can be clear audio-visual observation load change to and quick accurate ground bearing capacity design value in measuring ground plasticity district.
2. The utility model discloses a pressure sensor who is equipped with, and pressure sensor adopts digital display type load reading appearance to this obtains the load size that the ground receives, and through adopting PIV technique to obtain ground foundation soil body displacement field and shear strain field, need not to bury components and parts such as strainometer and soil pressure meter underground in the soil body, compares in conventional geotechnique model experiment, and the artifical disturbance that the ground soil body received in the greatly reduced test process increases the degree of accuracy of experimental result, reduces model test consumptive material cost etc. simultaneously.
3. The utility model discloses a mold box that is equipped with, and the transparent toughened glass of an installation of mold box, adopt transparent toughened glass can clearly observe the displacement situation of change of the soil body under the effect of load directly perceivedly, make things convenient for the camera continuity to shoot to through the one-to-one relation of computer direct output load and soil body shear strain, can obtain the dynamic emergence development process in ground plastic zone directly perceivedly.
4. To sum up, the utility model has the advantages of the experiment operation degree of difficulty is low, and the analysis work load of data is little, and the interference of human factor is weak, and test efficiency is high, low cost easily promotes.
Drawings
FIG. 1 is a schematic front view of the present invention;
fig. 2 is a schematic top view of the base and mold box of the present invention.
In the figure: 1. a base; 2. a model box; 3. a pull-down door; 4. transparent toughened glass; 5. a strip-shaped steel plate; 6. a pressure sensor; 7. a jack; 8. a soil body; 9. a counter-force beam; 10. a computer; 11. a shadowless lamp; 12. A camera.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1-2, the utility model provides a foundation plastic zone contactless testing device based on PIV technology, which comprises a testing device, the testing device is composed of a foundation model box and a vertical loading device, the foundation model box comprises a base 1, the middle part of the front side of the base 1 is movably connected with a lower sliding door 3, the top end of the base 1 is fixedly provided with a model box 2, the front side of the model box 2 is embedded and connected with a transparent toughened glass 4 through a window, the interior of the model box 2 is filled with a soil body 8, the vertical loading device comprises a jack 7, one end of the jack 7 is movably connected with a pressure sensor 6, the bottom end of the pressure sensor 6 is movably connected with a strip-shaped steel plate 5,
preferably, the testing device further comprises an image acquisition and processing device, the image acquisition and processing device comprises shadowless lamps 11, cameras 12 and a computer 10, the shadowless lamps 11 are located on two sides of the cameras 12, the cameras 12 are located right in front of the transparent toughened glass 4, the cameras 12 are in signal connection with the computer 10, and the pressure sensors 6 are electrically connected with the computer 10 so as to apply loads, acquire pictures and analyze synchronously, directly output the corresponding relation between the shear strain and the grading load of the foundation soil body and visually obtain the dynamic generation and development process of the foundation plastic region.
Preferably, the area of the strip steel plate 5 is less than or equal to one third of the surface area of the soil body 8, and the strip steel plate 5 is located in the middle of the surface of the soil body 8, so that the influence of the boundary effect is overcome, and the accuracy of the test result is improved.
Preferably, a plurality of reaction beams 9 parallel to each other are fixedly arranged at the opening at the top end of the model box 2, so that reaction forces of different sizes can be applied to the foundation conveniently, the structural strength of the model box 2 is improved, and the service life is prolonged.
Preferably, model case 2 is the steel construction cuboid, and model case 2's length, width and height are 1.6 meters, 0.6 meters and 1.4 meters respectively, convenient to use, and the removal of being convenient for has reduced work load in the model test.
When the device is used in detail, the utility model relates to a ground plastic zone contactless testing device based on PIV technology, firstly filling soil 8 in a model box 2 in a layering way, simulating engineering ground, paying attention to layering filling and compacting evenly in the filling process, controlling the surface of the soil to be flat, then placing a bar-shaped steel plate 5 on the surface of the soil 8, paying attention to that the rigid bearing plate area of the bar-shaped steel plate 5 is less than or equal to 1/3 of the filling surface area, placing a jack 7 at the vertical position of the center of the bar-shaped steel plate 5, vertically placing a pressure sensor 6 between the jack 7 and the bar-shaped steel plate 5, rotating the jack 7, enabling the top to be just contacted with the pressure sensor 6, lightening a shadowless lamp 11, enabling the shadowless lamp 11 to be placed at the two sides of transparent toughened glass 4, closing indoor light, ensuring that the front of the transparent toughened glass 4 has enough illumination, then placing a camera 12 right ahead of the transparent toughened glass 4, setting the focal length and shooting frequency of a camera 12, and pre-shooting pictures, wherein the pre-shot pictures require that no obvious light exists in a visual area of a model box 2, installing GeoPIV software in a computer 10, starting grading vertical loading and the camera 12 synchronously, rotating a jack 7, and shooting a pressed and deformed soil body in the model box 2 at a certain shooting frequency by using the camera 12 in the process of gradually increasing the vertical load, accurately controlling the grading load by using a pressure sensor 6 and recording the change relation of the grading load along with time, when the pressure sensor 6 detects that the numerical value suddenly drops at a certain time point, indicating that the stress state of the soil body 8 in the model box 2 is developed to a plastic flow stage from a plastic deformation stage, the soil body bulge appears at the periphery of a strip-shaped steel plate 5 at the moment, terminating the experiment, inputting the pictures shot in the model experiment process into the computer, and processing and analyzing the whole process image of the soil body deformation under the load by using the GeoPIV software, and obtaining a soil body displacement field diagram in the model box 2, converting the soil body displacement field diagram into a shearing strain cloud diagram according to the corresponding relation between displacement and strain, and fitting and analyzing the corresponding relation between a plastic region and a grading load, so that the dynamic generation development process of the soil body plastic region in the model box 2, the plastic region boundary line range and the morphological characteristics can be intuitively obtained, and meanwhile, the relation between the load and the soil body displacement field diagram, and the relation between the load and the shearing strain cloud diagram can be established.
In the description of the present invention, it should be understood that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.
In the present invention, unless otherwise explicitly specified or limited, for example, it may be fixedly connected, detachably connected, or integrated; can be mechanically or electrically connected; they may be directly connected or indirectly connected through an intermediate medium, and may be connected through the inside of two elements or in an interaction relationship between two elements, unless otherwise specifically defined, and the specific meaning of the above terms in the present invention will be understood by those skilled in the art according to specific situations.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. The utility model provides a ground plasticity district contactless testing arrangement based on PIV technique, includes testing arrangement, its characterized in that, testing arrangement comprises ground mold box and vertical loading device, the ground mold box includes base (1), the positive middle part swing joint of base (1) has drop-down door (3), the top fixed mounting of base (1) has mold box (2), the front of mold box (2) is inlayed through the window of seting up and is established and be connected with transparent toughened glass (4), the inside packing of mold box (2) has soil body (8), vertical loading device includes jack (7), the one end swing joint of jack (7) has pressure sensor (6), the bottom swing joint of pressure sensor (6) has bar steel sheet (5).
2. The PIV technology-based ground plasticity zone contactless testing device according to claim 1, wherein: the testing device further comprises an image collecting and processing device, the image collecting and processing device comprises shadowless lamps (11), cameras (12) and a computer (10), the shadowless lamps (11) are located on two sides of the cameras (12), the cameras (12) are located right in front of the transparent tempered glass (4), the cameras (12) are in signal connection with the computer (10), and the pressure sensors (6) are electrically connected with the computer (10).
3. The PIV technology-based ground plasticity zone contactless testing device according to claim 1, wherein: the area of the strip-shaped steel plate (5) is less than or equal to one third of the surface area of the soil body (8), and the strip-shaped steel plate (5) is positioned in the middle of the surface of the soil body (8).
4. The PIV technology-based ground plasticity zone contactless testing device according to claim 1, wherein: and a plurality of parallel reaction beams (9) are fixedly arranged at the opening at the top end of the model box (2).
5. The PIV technology-based ground plasticity zone contactless testing device according to claim 1, wherein: the model box (2) is a steel structure cuboid, and the length, the width and the height of the model box (2) are respectively 1.6 meters, 0.6 meters and 1.4 meters.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201920959112.8U CN210262999U (en) | 2019-06-25 | 2019-06-25 | Foundation plasticity district contactless testing arrangement based on PIV technique |
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| CN201920959112.8U CN210262999U (en) | 2019-06-25 | 2019-06-25 | Foundation plasticity district contactless testing arrangement based on PIV technique |
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| CN210262999U true CN210262999U (en) | 2020-04-07 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113504122A (en) * | 2021-06-30 | 2021-10-15 | 中铁十四局集团大盾构工程有限公司 | Tunnel segment upper soil body load deformation experimental device and method |
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2019
- 2019-06-25 CN CN201920959112.8U patent/CN210262999U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113504122A (en) * | 2021-06-30 | 2021-10-15 | 中铁十四局集团大盾构工程有限公司 | Tunnel segment upper soil body load deformation experimental device and method |
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Granted publication date: 20200407 Termination date: 20210625 |