Super-gravity test device for deformation characteristics of rib material of reinforced embankment
By combining a particle imaging system and a geotechnical centrifuge model test under hypergravity, and using a non-contact measurement method, the error problem in measuring the deformation characteristics of reinforcement under hypergravity was solved, achieving high-precision measurement of the overall deformation of reinforcement and soil, and improving the accuracy of studying the stress deformation and stability of reinforced embankments.
Patent Information
- Application Number
- CN202423182031.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-23
- Publication Date
- 2026-01-20
- Estimated Expiration
- 2034-12-23
AI Technical Summary
In existing technologies, there is a lack of effective means to measure the deformation characteristics of reinforced embankment reinforcement under hypergravity fields, and the use of bonded strain gauges can lead to measurement errors, making it impossible to comprehensively measure the overall deformation of the reinforcement and soil.
Combining particle imaging system (PIV) and geotechnical centrifuge model tests under hypergravity, a reinforced embankment model, industrial camera, signal transmission unit, control computer and image processing system were used to measure the deformation of the reinforcement material in a non-contact manner. A fixed-focus high-speed industrial camera and LED supplementary lighting were used to reduce light and shadow interference, and a laser displacement sensor was used to detect surface deformation.
It achieves high-precision, undisturbed measurement of reinforcement deformation, and can comprehensively obtain the overall deformation characteristics of reinforcement and soil, improving the accuracy and efficiency of measurement. It is suitable for studying the stress deformation and stability of reinforced embankments.
Smart Images
Figure CN223815305U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the reinforced embankment reinforcement deformation measurement technical field of geotechnical engineering, specifically related to a reinforced embankment's reinforcement deformation characteristic supergravity test device. BACKGROUND
[0002] In the expressway reconstruction project, the new and old roadbed splicing parts are prone to large differential deformation under the upper vehicle dynamic load due to the difference in the nature of the filling soil, causing pavement diseases and greatly shortening the pavement life. Therefore, it is usually necessary to lay geosynthetic materials at the new and old roadbed splicing parts to form a reinforced roadbed, adjust the stress distribution of the roadbed soil body, and reduce the differential deformation of the roadbed.
[0003] For the reinforced roadbed, the deformation characteristics of the reinforcement directly affect the stress deformation characteristics and stability of the roadbed, so it is urgent to develop a test device and method for measuring the deformation of the reinforcement. The geotechnical centrifuge can create a supergravity field by high-speed rotation of the rotating arm, thereby reproducing the initial stress state of the soil body, which is an effective method for studying the stress deformation characteristics and stability of the reinforced embankment. However, due to the limitations of measurement technology, the deformation characteristics of the reinforcement inside the embankment under supergravity field have been lacking effective measurement means for a long time. In previous studies, the method of pasting strain gauges on the reinforcement was often used to measure the stress and strain of the reinforcement, but pasting strain gauges would change the deformation modulus of the reinforcement, resulting in a large error in measurement, and only the stress and strain of a certain point of the reinforcement could be measured, and the overall deformation of the reinforcement and the differential deformation of the reinforcement and the soil body could not be measured.
[0004] Particle image system (PIV) is a method of analyzing the coordinates of particles in the image by analyzing the images before and after deformation through image analysis technology, thereby obtaining the image displacement deformation field. This method is a non-contact measurement method that does not interfere with the measurement object, and has high measurement accuracy. After algorithm optimization, the accuracy can reach microns, with great advantages.
[0005] Therefore, it is necessary to combine particle image system (PIV) and geotechnical centrifuge model test technology under supergravity field to develop a supergravity test device and test method for the deformation characteristics of the reinforcement of the reinforced embankment based on PIV technology. UTILITY MODEL CONTENTS
[0006] The utility model aims at overcoming the shortcomings of the prior art and providing a supergravity test device for the deformation characteristics of the reinforcement of the reinforced embankment.
[0007] The utility model is implemented by the following technical solutions:
[0008] The application discloses a supergravity test device for deformation characteristics of a reinforced road embankment, which comprises a supergravity model box, a reinforced road embankment model, an industrial camera, a signal transmission unit, a control computer and an image processing system; the reinforced road embankment model is arranged in the supergravity model box, the supergravity model box and the industrial camera are arranged in a supergravity geotechnical centrifuge, a lens of the industrial camera is aligned with the reinforced road embankment model in the supergravity model box through an observation window on the supergravity model box, and the industrial camera is connected with the signal transmission unit and the control computer; and the image processing system is installed on the control computer.
[0009] The reinforced road embankment model comprises a test soil sample, reinforced materials and circular mark points; the reinforced materials are embedded in the test soil sample in layers from bottom to top at a set interval, and side edges of the reinforced materials are close to the observation window, so that a plurality of horizontal measuring lines arranged at intervals from bottom to top are formed on the observation window; and flexible circular mark points are arranged at intervals on each measuring line, and the circular mark points can be deformed together with the soil sample.
[0010] In the technical scheme, the supergravity model box comprises a box frame, an observation window made of transparent material is arranged on the front of the box frame, and the lens of the industrial camera is used for taking a picture of the reinforced road embankment model in the supergravity model box through the observation window; and a laser displacement sensor is arranged on the top of the box frame and used for detecting a deformation amount of the upper surface of the reinforced road embankment model.
[0011] In the technical scheme, a top LED lamp strip is arranged on the top of the supergravity model box and used for light supplement of the reinforced road embankment model, so that the picture taking effect of the industrial camera is ensured.
[0012] In the technical scheme, a light absorption plate is arranged on the inner surface of the supergravity model box and used for reducing light reflection.
[0013] In the technical scheme, a polaroid film is pasted on the outer surface of the observation window, so that light reflection is further reduced.
[0014] In the technical scheme, a bottom LED lamp strip is arranged on the lower end of the outer surface of the observation window and used for light supplement of the reinforced road embankment model.
[0015] In the technical scheme, a scale ruler is arranged around the observation window.
[0016] In the technical scheme, the industrial camera is a fixed-focus high-speed industrial camera.
[0017] In the technical scheme, the signal transmission unit is composed of a transmission cable, an optical transceiver and a signal slip ring; the optical transceiver converts electric signals into optical signals, so that the signal transmission efficiency is improved; and the optical transceiver transmits signals from the geotechnical centrifuge to the control computer outside.
[0018] In the above technical scheme, the control computer is internally provided with a signal acquisition card and a large-capacity hard disk, and the image information is acquired and stored on the computer for a long time.
[0019] In the above technical scheme, the image processing system is compiled based on the digital speckle correlation principle, can analyze rich information such as displacement, deformation, crack and structure contained in the image, and automatically sets parameters such as frame rate, exposure and gain.
[0020] The utility model has the advantages and beneficial effects that:
[0021] (1) The utility model can effectively measure the deformation characteristics of the embankment reinforcement material, avoid the disturbance of the past strain gauge to the reinforcement material, improve the measurement accuracy, and can comprehensively obtain the overall deformation of the reinforcement material and the soil body.
[0022] (2) The utility model sets LED lamp strips around the organic glass observation window as the only light source for the test, which is similar to forming a shadowless lamp structure, reduces the influence of light and shadow on the measurement result, sets light absorption plates on the inner surface of the model box, and pastes polarizing films on the outer surface of the organic glass observation window, further reduces the light source reflection, and improves the accuracy of image analysis.
[0023] (3) The utility model adopts a fixed-focus high-frequency industrial camera as an image collector, which avoids the measurement error caused by the shaking of a zoom camera in a super gravity field.
[0024] (4) The utility model can highly restore the stress state of the reinforced embankment, is an effective method for studying the stress deformation characteristics and stability of the reinforced embankment, has high automation degree, is convenient for calibration, correction, extraction and analysis of the displacement field, and improves the efficiency of the reinforcement deformation measurement. BRIEF DESCRIPTION OF DRAWINGS
[0025] Figure 1 It is a structural schematic view of the reinforcement deformation characteristic super gravity test device of the reinforced embankment.
[0026] Figure 2 It is a schematic view of a super gravity model box.
[0027] Figure 3 It is a schematic view of a reinforced embankment model.
[0028] For ordinary skilled persons in the art, other related drawings can be obtained according to the above drawings without creative labor. DETAILED DESCRIPTION
[0029] In order to enable personnel in the art to better understand the utility model scheme, the technical scheme of the utility model will be further described below in combination with specific embodiments.
[0030] A kind of reinforced embankment's reinforcement deformation characteristic supergravity test device, see attached Figure 1 , the device includes: supergravity model box 1, reinforced embankment model 2, industrial camera 3, signal transmission unit 4, control computer 5 and image processing system 6;Reinforced embankment model 2 is arranged in supergravity model box 1, supergravity model box 1 and industrial camera 3 are placed in supergravity geotechnical centrifuge, and industrial camera 3 is installed on the fixed frame in centrifuge, with no relative displacement with supergravity model box 1, industrial camera 3 lens is aligned with the reinforced embankment model 2 in supergravity model box 1, and is connected with signal transmission unit 4, control computer 5;The image processing system 6 is installed on control computer 5.
[0031] See attached Figure 2 , the supergravity model box 1 includes the box frame 1-1 assembled by aviation aluminum plate, and the observation window 1-2 of transparent material is arranged on the front of the box frame 1-1, and the observation window is preferably of organic glass material, and the industrial camera 3 lens can be photographed through the observation window, so that the reinforced embankment model 2 in the supergravity model box 1 is photographed;Fixed frame 1-3 is arranged at the top of the box frame 1-1 to install laser displacement sensor 1-4 and top LED lamp strip 1-5, the number of laser displacement meter 1-4 is multiple, and it is vertically arranged to detect the deformation amount of the upper surface of the reinforced embankment model 2, and the top LED lamp strip 1-5 is used to light the reinforced embankment model 2 to ensure the photographing effect of the industrial camera 3;Further, the inner surface of the box frame 1-1 is mounted with light absorbing plate 1-6 for reducing light reflection;Further, the outer surface of the observation window 1-2 is pasted with polarizing film 1-7 to further reduce light reflection;Further, the bottom LED lamp strip 1-8 is installed at the lower end of the observation window 1-2, and the bottom LED lamp strip 1-8 is also used to light the reinforced embankment model 2 to ensure the photographing effect of the industrial camera 3;Further, the observation window 1-2 is provided with scale ruler 1-9 around.
[0032] See attached Figure 3 , the reinforced embankment model 2 includes test soil sample 2-1, reinforced material 2-2 and circular identification point 2-3, the reinforced material 2-2 is embedded in the test soil sample 2-1 according to the set number of layers from bottom to top, and the side edge of the reinforced material 2-2 is close to the observation window 1-2, so that a strip of horizontal measuring line is formed on the observation window 1-2 from bottom to top; Flexible circular identification points 2-3 are arranged at equal intervals on each measuring line, and the circular identification points 2-3 can deform with the soil sample.
[0033] Further, the industrial camera 3 is a fixed-focus high-speed industrial camera, and is connected with control computer 6 through signal transmission unit 4.
[0034] Further, the signal transmission unit 4 is composed of a transmission cable 4-1, an optical transceiver 4-2 and a signal slip ring 4-3, the optical transceiver 4-2 converts electrical signals into optical signals to improve signal transmission efficiency, and the optical transceiver 4-2 transmits signals from the inside of the geotechnical centrifuge to the external control computer 5.
[0035] Further, the control computer 5 is internally provided with a signal acquisition card 5-1 and a large-capacity hard disk 5-2 to collect and store image information on the computer for a long time.
[0036] Further, the image processing system 6 is based on the digital speckle correlation principle and can analyze rich information such as displacement, deformation, cracks and fabric in the image and automatically set parameters such as frame rate, exposure and gain.
[0037] The test method of the above-mentioned reinforced embankment reinforcement deformation characteristic supergravity test device is as follows:
[0038] Step 1, modulate the test soil sample 2-1: after drying, sieving and removing impurities, the test soil sample 2-1 with a certain water content is prepared by adding water and stirring.
[0039] Step 2, make the reinforced embankment model 2: the test soil sample 2-1 is loaded into the supergravity model box 1 layer by layer, each layer of test soil sample is compacted and the surface is scraped, and a layer of reinforced material 2-2 is laid on the surface of each layer of test soil sample, the side edge of the reinforced material 2-2 is close to the observation window 1-2, to ensure that the side edge of the reinforced material 2-2 can be seen from the side of the observation window 1-2, so that the side edge of the reinforced material 2-2 forms a measuring line, and a flexible marker 2-3 is installed on the side close to the observation window 1-2 on the measuring line, to ensure that the marker is coordinated with the soil deformation. In this way, the reinforced embankment model 2 is made by setting layer by layer from bottom to top.
[0040] Step 3, install the laser displacement meter 1-4 on the top of the supergravity model box 1, and install the top LED lamp strip 1-5; the number of laser displacement meters 1-4 is multiple, which are vertically arranged to detect the surface deformation of the reinforced embankment model 2.
[0041] Step 4, install the bottom LED lamp strip 1-8 at the lower end of the observation window 1-2 of the supergravity model box 1, and paste the scale ruler 1-9 around the observation window 1-2.
[0042] Step 5, install the supergravity model box 1 and the industrial camera 3 in the supergravity geotechnical centrifuge, and the lens of the industrial camera 3 is aligned with the reinforced embankment model 2 through the observation window 1-2 of the supergravity model box 1, and is connected with the signal transmission unit 4 and the control computer 5.
[0043] Step 6, open the top LED light belt 1-5 and the bottom LED light belt 1-8, only under this light source, start the super gravity soil centrifuge, under the super gravity field, the deformation process of the reinforced embankment model 2 is photographed through the industrial camera 3, and the displacement of the identification point 2-3 in the image is analyzed through the image processing system 6 by using PIV technology, that is, the deformation of the reinforced material 2-2 can be obtained, and compared with the measured parameters of the laser displacement meter 1-4 above the reinforced embankment model 2 and the scale ruler 1-9 pasted around the observation window, and then the deformation characteristics of the reinforced material and the overall deformation field of the reinforced embankment model are obtained.
[0044] For ease of description, spatial relative terms such as "upper", "lower", "left", "right" and the like are used in the embodiments to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the spatial terms are intended to encompass different orientations of the device in use or operation, in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "below" can encompass both an orientation of above and below. The device can be otherwise oriented (rotated 90 degrees or located in any other orientation) and the spatially relative descriptors used herein interpreted accordingly.
[0045] Also, terms such as "first" and "second", etc. are used merely to differentiate one from another of identical name, without necessarily requiring or implying any such actual relationship or order between such parts.
[0046] The above has made an exemplary description of the utility model, it should be explained that, without departing from the core of the utility model, any simple deformation, modification or other equivalent replacement of the person skilled in the art can not spend the protection scope of the utility model falls into the utility model without creative labor.
Claims
1. A gravity-based test device for the deformation characteristics of reinforced embankments, characterized in that, include: The system includes a supergravity model box, a reinforced embankment model, an industrial camera, a signal transmission unit, a control computer, and an image processing system. The reinforced embankment model is placed inside a hypergravity model box. The hypergravity model box and an industrial camera are placed inside a hypergravity geotechnical centrifuge. The lens of the industrial camera is aimed at the reinforced embankment model inside the hypergravity model box through the observation window on the hypergravity model box and is connected to the signal transmission unit and the control computer. The image processing system is installed on the control computer. The reinforced embankment model includes a test soil sample, reinforcement material, and circular markers. The reinforcement material is embedded in the test soil sample layer by layer from bottom to top according to a set number of layers, and the side of the reinforcement material is close to the observation window, thus forming horizontal measuring lines arranged from bottom to top on the observation window; flexible circular markers are set at equal intervals on each measuring line.
2. The gravity test device for the deformation characteristics of reinforced embankments according to claim 1, characterized in that: The hypergravity model box includes a box frame, with a transparent observation window on the front of the box frame; a laser displacement sensor is installed on the top of the box frame to detect the deformation of the upper surface of the reinforced embankment model.
3. The gravity test device for the deformation characteristics of reinforced embankments according to claim 1, characterized in that: A top LED light strip is installed on the top of the supergravity model box.
4. The gravity test device for the deformation characteristics of reinforced embankments according to claim 1, characterized in that: Install light-absorbing plates on the inner surface of the hypergravity model box.
5. The gravity test device for the deformation characteristics of reinforced embankments according to claim 1, characterized in that: Observe the polarizing film pasted on the outer surface of the observation window.
6. The gravity test device for the deformation characteristics of reinforced embankments according to claim 1, characterized in that: A bottom LED light strip is installed at the lower outer end of the observation window.
7. The gravity test device for the deformation characteristics of reinforced embankments according to claim 1, characterized in that: A scale is set around the observation window.
8. The gravity test device for the deformation characteristics of reinforced embankments according to claim 1, characterized in that: The industrial camera is a fixed-focus high-speed industrial camera.
9. The gravity test device for the deformation characteristics of reinforced embankments according to claim 1, characterized in that: The signal transmission unit consists of a transmission cable, an optical transceiver, and a signal slip ring.
10. The gravity test device for the deformation characteristics of reinforced embankments according to claim 1, characterized in that: The control computer is equipped with a signal acquisition card and a large-capacity hard drive.