CN104596869B - Test method of four-dimensional dynamic quantitative analysis during soil shear failure - Google Patents
Test method of four-dimensional dynamic quantitative analysis during soil shear failure Download PDFInfo
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Abstract
The invention discloses a test method of four-dimensional dynamic quantitative analysis during soil shear failure. The method comprises the steps of firstly, based on a two-dimensional optical testing technology, acquiring two-dimensional plane dynamic change characteristics based on time dimension in the soil shear process; setting time at intervals, carrying out a micro-computed tomography (CT) test on a soil sample by an X-ray detector based on a rotary table type scanning technology to obtain soil three-dimensional space static characteristics; establishing a light hole transmission registration model, and carrying out spatial aligning on two-dimensional optical data and three-dimensional micro-CT data; according to the dynamic change of same mark points of the two-dimensional optical data and three-dimensional micro-CT data, carrying out butt joint on the two-dimensional plane change data and the micro-CT three-dimensional space data by a space registration relation to obtain the soil three-dimensional space dynamic change characteristics based on time dimension; therefore, the test method of the four-dimensional dynamic quantitative analysis during soil shear failure can be realized.
Description
Technical field
The present invention relates to a kind of test method of soil body failure by shear four-dimension dynamic analysis, belong to civil engineering indoor
Technical field of measurement and test.
Background technology
The failure by shear mechanism of the soil body is always the focus of Chinese scholars research, and China develops and introduced many soil bodys
The test method of fine structure, such as：Mercury injection method, magnetic susceptibility method, scanning electron microscope analysis method (SEM), computerized tomography are swept
Retouch analytic approach (CT), Microstructure Optics test system (MOTS) etc., the development of these test methods and introducing as further investigation soil
The failure by shear mechanism of body provides approach.However, the equal Shortcomings of existing all kinds of soil body fine structure test method it is impossible to
Realize the analysis of experiments of four-dimensional dynamic quantitative, providing four-dimensional dynamic analysis test method undoubtedly will make announcement damage of soil body machine
Reason research is further.
Although forefathers have carried out fruitful research in terms of optic test, CT test, achieve many achievements, be subject to
The factors such as tester, measuring technology limit, and two methods still all have deficiency：
(1) in terms of optic test, fine structure optic testing system (MOTS) rock-soil material fine structure continuously with
Track, quantitative observation aspect have greater advantage.However, optical observation can only provide the information of light institute covering part, therefore the method
Provide two dimensional surface observation data (soil sample is semicolumn sample), fail to obtain soil body three-dimensional microstructure information, the soil body is tied
Structure describes obviously more advantage with three dimensions.
(2) in terms of CT test, traditional CT test machine (borrowing medical ct machine) is obtaining the fine structure of soil body material more
Three-dimensional information aspect is progressively substituted by high-performance Micro-CT machine.Even so, current Micro-CT machine is only to the soil body
It is scanned (before as on-test, after off-test) under a certain special state, this means of testing is still unable to follow-on test
The real change situation (other research techniques are also such, such as SEM method etc.) of rock-soil material micro-structural under load, therefore also no
Method considers the actual displacement change information of rock-soil material microparticle and hole from the time.It is true that under rock-soil material load-bearing
Deformation failure is the process that a primary structure gradually destroys, secondary structure gradually forms, and is the process of a dynamic change, root
Microstructure change according to sample a certain stage or destruction result carrys out its Changing Pattern under stress of inference, must have its limitation
Property, also can only rest in qualitative and logic analysis.
Content of the invention
The technical problem to be solved is to provide a kind of test of soil body failure by shear four-dimension dynamic analysis
Method, the method is based on two-dimension optical measuring technology and Micro-CT three-dimensional test technology, and it is broken to be that one kind can be used for soil body shearing
The test method of four-dimensional (space three-dimensional, time dimension) dynamic analysis during bad.
The present invention is to solve above-mentioned technical problem to employ the following technical solutions
The present invention provides a kind of test method of soil body failure by shear four-dimension dynamic analysis, including walking in detail below
Suddenly：
Step 1, loads in shear history in the soil body, based on two-dimension optical measuring technology, obtain the soil body based on time dimension
Two dimensional surface dynamic change characterization；
Step 2, loads in shear history in the soil body, is suspended according to the time interval setting and loads, based on turntable type scanning
Technology, using X-ray detector, the soil body is carried out with Micro-CT test, obtain the three dimensions static nature of the soil body；
Step 3, after Micro-CT test terminates, immediately continues with loading, and continues synchronous to carry out two-dimension optical test and obtain
Fetch earth the two dimensional surface dynamic change characterization based on time dimension of body；
Step 4, according to step 1 to 3, alternately two-dimension optical test and Micro-CT test, until soil body shearing is broken
Bad；
Step 5, sets up unthreaded hole transmission registration model, by obtain the two dimensional surface dynamic change characterization based on time dimension with
Three dimensions static nature carries out spatial registration, according to the dynamic change of the point of same tag between the two, by based on time dimension
Two dimensional surface dynamic change characterization is docked with three dimensions static nature by spatial registration relation, makes the two dimension based on time dimension
Plane dynamic change characterization is merged with three dimensions static nature, and the soil body three dimensions dynamic change obtaining based on time dimension is special
Levy, thus the four-dimensional dynamic analysis test during realizing soil body failure by shear.
As the further prioritization scheme of the present invention, in step 1, it is based on two-dimension optical measuring technology, obtain the soil body and sheared
Two dimensional surface dynamic change characterization based on time dimension in journey, specially：Distance microscope CCD light using high-amplification-factor
Learn camera, be equipped with high-resolution digital image collection system, be synchronously continuously shot the photo in soil body shear history, thus
Obtain the two dimensional surface dynamic change characterization based on time dimension.
As the further prioritization scheme of the present invention, the distance microscope CCD optical camera of above-mentioned high-amplification-factor
Multiplication factor be 20～500 times.
As the further prioritization scheme of the present invention, in step 2, X-ray detector is Japanese shore pine Hamamatsu
The flat panel detector based on CMOS for the C7942CA-02.
As the further prioritization scheme of the present invention, the desk-top scanning technique of step 2 transfer is specially：Using an automatically controlled rotation
Turntable completes spinfunction, ties up, using x dimension, y dimension, z, the adjustment that electronic control translation stage realizes the three-dimensional space position of the scanned soil body.
The present invention adopts above technical scheme compared with prior art, has following technique effect：The present invention is based on two dimension
Optical testing technology and Micro-CT three-dimensional test technology, two-dimensional optical data (time dimension, the sky based on time dimension that will obtain
Between two dimension) carry out spatial registration with Micro-CT three-dimensional data (space three-dimensional), dock, merge, the soil based on time dimension for the acquisition
Body three dimensions dynamic change characterization, realizes the dynamic quantitative of four-dimensional (space three-dimensional, time dimension) during soil body failure by shear
Analysis test.
Brief description
Fig. 1 is method of the present invention flow chart.
Fig. 2 is the top view of the four-dimensional dynamic checkout unit of the present invention.
Wherein：1-Micro-CT radiographic source；2- semicolumn soil sample；3- central authorities rotation control platform；4-x D controller；5-y
D controller；6-X ray；7-Y ray flat panel detector；8-CCD camera；9- protects stereotype；10-CCD plane.
Fig. 3 is the co-ordinates system schematic diagram with Micro-CT three-dimensional test for the coordinate system of two-dimension optical test.
Specific embodiment
Below in conjunction with the accompanying drawings technical scheme is described in further detail：
Fig. 1 is method of the present invention flow chart, has been specifically described, repeats no more here in the content of the invention above.
With reference to specific embodiment, technical scheme is further elaborated：
First, as shown in Fig. 2 building test device, and prepare semi-cylindrical soil sample.
Secondly, in loading shear history, based on two-dimension optical measuring technology, obtain the time that is based in soil body shear history
The two dimensional surface dynamic change characterization of dimension.
Again, the soil body loads in shear history, according to the time setting, such as time t1, suspend and load, start immediately
Micro-CT, based on turntable type scanning technique, carries out Micro-CT rotation sweep test using X-ray detector to soil sample；
Again, Micro-CT soil sample is carried out rotation sweep terminate after (note time loss be tc1) immediately continue with loading,
In loading procedure, synchronization carries out optical observation, is loaded into the time t of setting2Afterwards, stop loading, then proceed with Micro-CT
Test, so repeatedly up to off-test；
Again, build unthreaded hole transmission registration model, set up two-dimension optical and test coordinate system and Micro-CT three-dimensional test
Co-ordinates system, the two dimensional surface dynamic change characterization based on time dimension is carried out space with the three dimensions static nature obtaining
Registration, that is, in data processing, according to the dynamic change of two-dimensional optical image and Micro-CT three-dimensional data same tag point
Changing, flash ranging change being corresponded to Micro-CT three-dimensional data by spatial registration relation, thus realizing optical data (space two
Dimension, time dimension) merge with Micro-CT data (space three-dimensional), realize four-dimensional dynamic analysis during soil body failure by shear
Test.
The unthreaded hole transmission registration model building is as follows with spatial registration process：
(1) the co-ordinates system of the coordinate system of two-dimension optical test and Micro-CT three-dimensional test, as shown in Figure 3.Wherein,
The coordinate system of two-dimension optical test is M-xyz, and the coordinate system of Micro-CT three-dimensional test is O-xyz, both shared y-axis；
(2) build unthreaded hole transmission registration model, optical CCD camera is modeled, as shown in Figure 3.In this model, CCD lens
It is equivalent to photocentre M, CCD place plane is referred to as image plane EFGH, y-axis N point, soil sample institute during focus are handed in image plane EFGH center
It is referred to as focal plane ABCD in plane；
(3) for registration point P on soil sample surface, its locus can determine with Micro-CT data, that is, it is empty
Between the Micro-CT coordinate value of position be known, be expressed as (xCT, yCT,zCT), the visible ray transmiting from this point is through lens light
The heart is mapped to the P ' point of CCD, and point P and point P ' corresponds；
(4) because optics/Micro-CT emerging system is arranged on the optical table of same standard, two coordinate systems are described
Three translational movements of relation and three rotation amounts between (M-xyz, O-xyz), it is convenient to omit two translational movements and three rotation amounts,
Only consider the translational movement with regard to y-axis；
(5) coordinate value under optical coordinate for Micro-CT origin of coordinates O is (cx,cy,cz), then registration point P is sat in optics
Marking the three-dimensional coordinate being is
(6) point P and point P ', with regard to photocentre M point symmetry, remembersFor l1,For l2, then the coordinate of P ' be：
(7) for optical coordinate system M-xyz, the coordinate of registration point P is (xM,yM,zM), for some registration point, construction is by mistake
Difference function：Wherein, i=1...n, is registration point
Number.
(8) using optimization or searching method, seek (the c making error function Φ minimumx,cy,cz).
Finally, tested by Micro-CT, the three-dimensional coordinate that can obtain inside soil body point is：(xCT,yCT,zCT), pass through
Registration obtain optical coordinate system three-dimensional coordinate be：Add optic test when
Between factor, then soil body shearing four-dimensional test displacement field be expressed as：
The above, the only specific embodiment in the present invention, but protection scope of the present invention is not limited thereto, and appoints
What be familiar with the people of this technology disclosed herein technical scope in it will be appreciated that the conversion expected or replacement, all should cover
Within the scope of the comprising of the present invention, therefore, protection scope of the present invention should be defined by the protection domain of claims.
Claims (5)
1. the test method of soil body failure by shear four-dimension dynamic analysis is it is characterised in that include step in detail below：
Step 1, loads in shear history in the soil body, based on two-dimension optical measuring technology, obtains based on time dimension the two of the soil body
Dimensional plane dynamic change characterization；
Step 2, the soil body load shear history in, according to set time interval suspend load, based on turntable type scanning technique,
Micro-CT test is carried out using X-ray detector to the soil body, obtains the three dimensions static nature of the soil body；
Step 3, after Micro-CT test terminates, immediately continues with loading, and continues synchronous to carry out two-dimension optical test and obtain soil
The two dimensional surface dynamic change characterization based on time dimension of body；
Step 4, according to step 1 to 3, alternately two-dimension optical test and Micro-CT test, until soil body failure by shear；
Step 5, sets up unthreaded hole transmission registration model, by the two dimensional surface dynamic change characterization based on time dimension obtaining and three-dimensional
Space static nature carries out spatial registration, according to the dynamic change of the point of same tag between the two, by the two dimension based on time dimension
Plane dynamic change characterization is docked with three dimensions static nature by spatial registration relation, makes the two dimensional surface based on time dimension
Dynamic change characterization is merged with three dimensions static nature, obtains the soil body three dimensions dynamic change characterization based on time dimension,
Thus the four-dimensional dynamic analysis test during realizing soil body failure by shear.
2. the test method of soil body failure by shear four-dimension dynamic analysis according to claim 1 is it is characterised in that walk
It is based on two-dimension optical measuring technology in rapid 1, obtain the two dimensional surface dynamic change characterization based on time dimension in soil body shear history,
It is specially：Using the distance microscope CCD optical camera of high-amplification-factor, it is equipped with high-resolution digital image acquisition system
System, is synchronously continuously shot the photo in soil body shear history, thus obtaining the two dimensional surface dynamic change characterization based on time dimension.
3. the test method of soil body failure by shear according to claim 2 four-dimension dynamic analysis is it is characterised in that height
The multiplication factor of the distance microscope CCD optical camera of multiplication factor is 20～500 times.
4. the test method of soil body failure by shear four-dimension dynamic analysis according to claim 1 is it is characterised in that walk
In rapid 2, X-ray detector is the flat panel detector based on CMOS for the C7942CA-02 of Japanese shore pine Hamamatsu.
5. the test method of soil body failure by shear four-dimension dynamic analysis according to claim 1 is it is characterised in that walk
The desk-top scanning technique of rapid 2 transfers is specially：Complete spinfunction using an electronically controlled rotary table, automatically controlled using x dimension, y dimension, z dimension
Translation stage realizes the adjustment of the three-dimensional space position of the scanned soil body.
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| CN106353201A (en) * | 2016-08-25 | 2017-01-25 | 绍兴文理学院 | Real-time three-dimensional CT (computed tomography) scanning type rock joint shear test system |
| CN106525575A (en) * | 2016-10-13 | 2017-03-22 | 绍兴文理学院 | Rock joint direct shear test system suitable for CT three-dimensional real-time scanning |
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Application publication date: 20150506 Assignee: JIANGXI BOHUI ENGINEERING TECHNOLOGY SERVICE Co.,Ltd. Assignor: HOHAI University Contract record no.: X2021320000009 Denomination of invention: Experimental method for four dimensional dynamic quantitative analysis of soil shear failure Granted publication date: 20170222 License type: Common License Record date: 20210108 |