CN107436133A - The method of CT scan technology quantitative measurment frozen soil volume of sample deformation is utilized during Mechanical loading - Google Patents
The method of CT scan technology quantitative measurment frozen soil volume of sample deformation is utilized during Mechanical loading Download PDFInfo
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- CN107436133A CN107436133A CN201710604644.5A CN201710604644A CN107436133A CN 107436133 A CN107436133 A CN 107436133A CN 201710604644 A CN201710604644 A CN 201710604644A CN 107436133 A CN107436133 A CN 107436133A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B15/00—Measuring arrangements characterised by the use of electromagnetic waves or particle radiation, e.g. by the use of microwaves, X-rays, gamma rays or electrons
- G01B15/06—Measuring arrangements characterised by the use of electromagnetic waves or particle radiation, e.g. by the use of microwaves, X-rays, gamma rays or electrons for measuring the deformation in a solid
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Abstract
The method of CT scan quantitative measurment frozen soil volume of sample deformation is utilized during Mechanical loading the invention discloses a kind of, it is that the frozen soil sample that will be prepared is fitted into frozen soil triaxial apparatus and is placed on CT lathes and carries out Scan orientation together, Mechanical loading parameter is set according to test requirements document, and Mechanical loading is carried out to frozen soil sample, CT scan is carried out to sample to during a certain mechanical state, obtains all tomography CT images for covering full sample.The Area of Sample of all tomographies is obtained by two-dimensional CT image measurement, wherein in this condition the volume of sample can be multiplied by by every layer of section Area of Sample Scan slice thickness be added draw, the volume change under the mechanics stage finally is calculated according to volume change formula.The present invention can solve the problems, such as that measurement error is larger caused by line expansion in traditional measurement body change method, greatly improves the precision of experiment with the frozen soil volume of sample size and volume change at a certain moment in accurate measurement mechanical process.
Description
Technical field
The two-dimensional CT image obtained using CT scan the present invention relates to a kind of a certain moment during Mechanical loading come
The test method of quantitative measurment frozen soil volume of sample variable quantity.
Background technology
During the frozen soil mechanics experiment of the real-time dynamic scans of CT, volume change of the sample under different stress conditions
It is more important physical parameter, and make during existing many constitutive models calculate and using the parameter as known variables
With.It largely decides the macromechanics feature in single shaft or the visco-plasticity stage under three axle stress conditions simultaneously, passes
The method of system measuring frozen volume change is to control confined pressure to add the metering cylinder of unloading to discharge into/discharge pressure by three axle loading devices
The oil mass value of power room to measure to obtain the volume change after sample stand under load indirectly, but this kind of mode is not considered due to pressure
The caused connecting pipeline of power change（High-pressure oil pipe）The caused margin of error is expanded, the more long this error of connecting pipeline is more
Greatly, this will certainly influence final result of the test and make it that test data is inaccurate.This kind of method is also only applicable to three-axis force simultaneously
Experiment is learned, is not particularly suited for uniaxial loading experiment.In order to solve the above problems, design a kind of during Mechanical loading experiment
Method using the cubic deformation amount of CT scan technology measuring frozen sample has particularly important realistic meaning.
The content of the invention
In view of above-mentioned, the purpose of the present invention is aimed to provide one kind and determined during Mechanical loading experiment using CT scan technology
The method of the cubic deformation amount of measurement frozen soil sample
The purpose of the present invention through the following steps that realize：
It is a kind of that the method for CT scan technology quantitative measurment frozen soil volume of sample deformation, its step are utilized during Mechanical loading
It is：
A. a diameter of 61.8mm, a length of 125mm cylindrical types standard are prepared according to Standard for test methods of earthworks GB-T50123-1999
Soil sample；
B. the normal temperature standard soil sample prepared is put into freezer, after being cooled down 24 hours rapidly under the conditions of -30 DEG C, is put into perseverance
According to -3.4 DEG C of constant temperature of design temperature are tested 24 hours in incubator, frozen soil sample is made
C. the length and diameter of frozen soil sample are measured, calculates the volume of sample under original stateV 0 , and keep a record；
D. the frozen soil sample sample after constant temperature is fitted into in the matching used frozen soil triaxial apparatus of CT machines, opening the refrigeration of triaxial apparatus
Equipment is freezed rapidly, and when temperature stabilization to when testing design temperature, frozen soil triaxial apparatus is placed on into CT together with frozen soil sample
On machine is scanning bed；
E. the position of CT lathes and triaxial apparatus is adjusted so that sample is located at the center of CT machine laser positioning line scanning areas；
F. Mechanical loading parameter is set according to test requirements document, to wait strain controlling, loading speed is wherein Loading Control mode
0.3mm/min, confined pressure are set as 1MPa, and Mechanical loading is carried out to frozen soil sample, when needing CT scan when strain value reaches 4%,
CT scan is carried out to sample under conditions of mechanical test is not interrupted, sweep length covers whole frozen soil sample, obtains straining
For 4% when all tomographies of sample CT images, and writing scan parameter；
G. the Area of Sample of each section on CT images is measured successively, according to formula：, try to achieve i moment frozen soil
The volume of sample, and keep a record；
H. according to formula：, the volume changes of i moment frozen soil samples is calculated.
The present invention has the advantage that and caused good effect：
（1）The present invention utilizes existing CT scan technology and ready-made frozen soil triaxial apparatus, and the volume of quantitative measurment frozen soil sample becomes
Shape amount, and the volume change of frozen soil sample is calculated from formula, method is simple, and measurement accuracy is higher, and it solves three axles and added
Carry and put the problem of control confined pressure adds the cubic deformation measurement error caused by the metering cylinder line expansion of unloading larger；
（2）The present invention is to carry out basic work frozen soil experiment early stage, is become for the volume for researching and analysing frozen soil sample from now on
Water content, dry density distribution and the change of frozen clay deformation characteristic provide technical support during shape, are in frozen soil experiment
The effect taken over from the past and set a new course for the future.
Brief description of the drawings
Fig. 1 is the flow chart of test method implementation steps of the present invention；
Embodiment:
The CT machines of scanning of the present invention are the medical spiral CT of Brilliance 16 of PHILIPS Co.；Frozen soil triaxial apparatus is used in experiment
Can be realized on CT scan bed three-axis force overall process test, using etc. strain and wait strain two kinds of Different Loading Methods, automatically
Experiment process load and displacement are recorded, by changing loading speed, step-loaded experiment can be achieved；Coordinate CT machines during experiment
The CT scan of different condition is carried out to sample at any time, analyzes the change of sample interior density and structure.
It is a kind of that the method for CT scan quantitative measurment frozen soil volume of sample deformation, its step are utilized during Mechanical loading
It is：
A. the soil property for testing selection is Lanzhou loess, is derived from the domestic Yongdeng in Gansu to ancient unrestrained highway Yongdeng County and fetches earth field
Near, its liquid limit is 26.29%, plastic limit 18.24%, is named as low liquid limit clay, according to Standard for test methods of earthworks GB-
T50123-1999 prepares a diameter of 61.8mm, a length of 125mm cylindrical types standard soil sample；
B. the normal temperature standard soil sample prepared is put into freezer, rapid cooling 24 hours under the conditions of -30 DEG C, after be put into perseverance
According to -3.4 DEG C of design temperature of experiment in incubator.The temperature is the annual Gansu Province Frozen Area in 2013 obtained by field monitoring
At 2（Cliff willow highway K1754+450 and ten days highway K700+060）Minimum ground temperature at roadbed tailo underground 0.5cm.
Constant temperature 24 hours, frozen soil sample is made；
C. a diameter of 61.8mm and length for measuring frozen soil sample are 125mm, calculate the volume of sample under original stateV 0 For
374.76cm3, and keep a record；
D. the frozen soil sample sample after constant temperature is fitted into in the matching used frozen soil triaxial apparatus of CT machines, opening the refrigeration of triaxial apparatus
Rapid -3.4 DEG C of refrigeration of equipment, when temperature stabilization to when testing -3.4 DEG C of design temperature, by frozen soil triaxial apparatus together with frozen soil sample
Be placed on together CT machines it is scanning bed on；
E. the position of CT lathes and triaxial apparatus is adjusted so that frozen soil sample is located at the center of CT machine laser positioning line scanning areas；
F. Mechanical loading parameter is set according to test requirements document, to wait strain controlling, loading speed is wherein Loading Control mode
0.3mm/min, confined pressure are set as 1MPa, and Mechanical loading is carried out to frozen soil sample, when needing CT scan when strain value reaches 4%,
CT scan is carried out to sample under conditions of mechanical test is not interrupted, sweep length covers whole frozen soil sample, obtains straining
For 4% when all tomographies of sample CT images, and the Scan slice thickness set during writing scan, this experimentSetting value is
3mm；
G. the Area of Sample for measuring each section on CT images successively obtainsValue be 124.42cm2Concurrently set
Scan slice thicknessValue be 3mm, substitute into formula（1）Try to achieve frozen soil sample when strain reaches 4%
The value ﹦ 373.27cm of volume3
Step c calculates the volume of sample under frozen soil sample original stateV 0 =374.76cm3, formula（1）Try to achieve i moment frozen soil
SampleThe value ﹦ 373.27cm of volume3。
It can be seen that from above test result analysis：Frozen soil sample is in the case of two kinds initially and after stress, initial shape
The volume of sample under stateV 0 With the volume under i moment stress conditionsDifference, illustrate the change of frozen soil sample volume in loading procedure
Change the change for directly influencing sample internal structure, with the continuous increase of load, the volume of i moment frozen soil samplesAlso it is different.
Then the volume by sample under frozen soil sample original state then,=374.76cm3And formula（1）Trying to achieve strain is
Frozen soil sample when 4%The value ﹦ 373.27cm of volume3Substitute into formula（2）：Calculate
Go out the volume change of the moment frozen soil sampleFor 0.4%.
Claims (1)
1. a kind of be using the method for CT scan quantitative measurment frozen soil volume of sample deformation, its step during Mechanical loading：
A. a diameter of 61.8mm, a length of 125mm cylindrical types standard are prepared according to Standard for test methods of earthworks GB-T50123-1999
Soil sample；
B. after the normal temperature standard soil sample prepared being put into -30 DEG C of freezers into rapid constant temperature cooling 24 hours, it is put into insulating box
According to -3.4 DEG C of constant temperature of design temperature are tested 24 hours, frozen soil sample is made；
C. the length and diameter of frozen soil sample are measured, calculates the volume of sample under original stateV 0 , and keep a record；
D. the frozen soil sample sample after constant temperature is fitted into in the matching used frozen soil triaxial apparatus of CT machines, opening the refrigeration of triaxial apparatus
Equipment is freezed rapidly, and when temperature stabilization to when testing design temperature, frozen soil triaxial apparatus is placed on into CT together with frozen soil sample
On machine is scanning bed；
E. the position of CT lathes and triaxial apparatus is adjusted so that sample is located at the center of CT machine laser positioning line scanning areas；
F. Mechanical loading parameter is set according to test requirements document, to wait strain controlling, loading speed is wherein Loading Control mode
0.3mm/min, confined pressure are set as 1MPa, and Mechanical loading is carried out to frozen soil sample, when needing CT scan when strain value reaches 4%,
CT scan is carried out to sample under conditions of mechanical test is not interrupted, sweep length covers whole frozen soil sample, obtains straining
For 4% when all tomographies of sample CT images, and writing scan parameter；
G. the Area of Sample of each section on CT images is measured successively, according to formula：, try to achieve the examination of i moment frozen soil
The volume of sample, and keep a record；
H. according to formula：, the volume changes of i moment frozen soil samples is calculated.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108169022A (en) * | 2018-02-06 | 2018-06-15 | 中国科学院寒区旱区环境与工程研究所 | Soil's Poisson ratio measuring method, apparatus and system |
| CN109030340A (en) * | 2018-07-16 | 2018-12-18 | 三峡大学 | A kind of self-expanding Load-unload device and method |
| CN114689820A (en) * | 2022-03-07 | 2022-07-01 | 保山学院 | Expansive soil swelling and shrinking characteristic testing and evaluating method based on three-dimensional scanning |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1133420A1 (en) * | 1998-11-26 | 2001-09-19 | Canpolar East Inc. | Collision deformation sensor using a source of wave energy for use in the crush zone of a vehicle |
| DE10254908A1 (en) * | 2002-11-25 | 2004-06-17 | Siemens Ag | Medical imaging image processing method for generation of an image from a 3D image, whereby a volume data record with a segmented surface is transformed into a layer of defined thickness to permit visualization of fine structure |
| CN101236663A (en) * | 2007-12-29 | 2008-08-06 | 浙江工业大学 | Heart capacity calculation method based on NURBS curve surface integral |
| CN102293658A (en) * | 2010-06-25 | 2011-12-28 | 卢世璧 | CT (computed tomography)-based tissue or material interior three-dimensional deformation measuring system and measuring method |
| CN102628682A (en) * | 2012-04-24 | 2012-08-08 | 重庆大学 | Volume measurement method based on industrial CT scanning technology |
| CN102980531A (en) * | 2012-12-07 | 2013-03-20 | 中国铁道科学研究院 | Volume measurement method and device based on three-dimensional laser scanning |
| CN104297267A (en) * | 2013-07-16 | 2015-01-21 | 中国科学院寒区旱区环境与工程研究所 | Cylindrical disk for quantitatively measuring fault density of rock and soil on CT-machine scanning bed and method thereof |
| CN106018238A (en) * | 2016-05-31 | 2016-10-12 | 浙江大学 | Method for determining pore structure of soil profile |
-
2017
- 2017-07-24 CN CN201710604644.5A patent/CN107436133A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1133420A1 (en) * | 1998-11-26 | 2001-09-19 | Canpolar East Inc. | Collision deformation sensor using a source of wave energy for use in the crush zone of a vehicle |
| DE10254908A1 (en) * | 2002-11-25 | 2004-06-17 | Siemens Ag | Medical imaging image processing method for generation of an image from a 3D image, whereby a volume data record with a segmented surface is transformed into a layer of defined thickness to permit visualization of fine structure |
| CN101236663A (en) * | 2007-12-29 | 2008-08-06 | 浙江工业大学 | Heart capacity calculation method based on NURBS curve surface integral |
| CN102293658A (en) * | 2010-06-25 | 2011-12-28 | 卢世璧 | CT (computed tomography)-based tissue or material interior three-dimensional deformation measuring system and measuring method |
| CN102628682A (en) * | 2012-04-24 | 2012-08-08 | 重庆大学 | Volume measurement method based on industrial CT scanning technology |
| CN102980531A (en) * | 2012-12-07 | 2013-03-20 | 中国铁道科学研究院 | Volume measurement method and device based on three-dimensional laser scanning |
| CN104297267A (en) * | 2013-07-16 | 2015-01-21 | 中国科学院寒区旱区环境与工程研究所 | Cylindrical disk for quantitatively measuring fault density of rock and soil on CT-machine scanning bed and method thereof |
| CN106018238A (en) * | 2016-05-31 | 2016-10-12 | 浙江大学 | Method for determining pore structure of soil profile |
Non-Patent Citations (2)
| Title |
|---|
| 郑剑锋等: "三轴压缩条件下基于CT实时监测的冻结兰州黄土细观损伤变化研究", 《冰川冻土》 * |
| 陈世杰等: "利用ＣＴ扫描技术进行冻土研究的现状和展望", 《冰川冻土》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108169022A (en) * | 2018-02-06 | 2018-06-15 | 中国科学院寒区旱区环境与工程研究所 | Soil's Poisson ratio measuring method, apparatus and system |
| CN109030340A (en) * | 2018-07-16 | 2018-12-18 | 三峡大学 | A kind of self-expanding Load-unload device and method |
| CN109030340B (en) * | 2018-07-16 | 2021-02-19 | 三峡大学 | Self-expansion loading and unloading device and method |
| CN114689820A (en) * | 2022-03-07 | 2022-07-01 | 保山学院 | Expansive soil swelling and shrinking characteristic testing and evaluating method based on three-dimensional scanning |
| CN114689820B (en) * | 2022-03-07 | 2024-06-04 | 保山学院 | Swelling and shrinking characteristic test and evaluation method of swelling soil based on three-dimensional scanning |
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