CN102901460A - Device and method for measuring radial deformation of tri-axial sample - Google Patents

Device and method for measuring radial deformation of tri-axial sample Download PDF

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Publication number
CN102901460A
CN102901460A CN2012104343425A CN201210434342A CN102901460A CN 102901460 A CN102901460 A CN 102901460A CN 2012104343425 A CN2012104343425 A CN 2012104343425A CN 201210434342 A CN201210434342 A CN 201210434342A CN 102901460 A CN102901460 A CN 102901460A
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China
Prior art keywords
sample
measurement
radial deformation
tri
pressure chamber
Prior art date
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Pending
Application number
CN2012104343425A
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Chinese (zh)
Inventor
叶阳升
张千里
史存林
陈锋
蔡德钩
马伟斌
姚建平
闫宏业
王立军
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Railway Engineering Research Institute of CARS
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Railway Engineering Research Institute of CARS
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Publication date
Application filed by Railway Engineering Research Institute of CARS filed Critical Railway Engineering Research Institute of CARS
Priority to CN2012104343425A priority Critical patent/CN102901460A/en
Publication of CN102901460A publication Critical patent/CN102901460A/en
Pending legal-status Critical Current

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Abstract

The invention discloses a device and a method for measuring radial deformation of a tri-axial sample, wherein the device is characterized in that a fixed bracket for a radial deformation measurement device comprises a locating bracket with the same central axis with a tri-axial pressure chamber; the locating bracket is tightly close to the tri-axial pressure chamber; the fixed bracket has a sliding block freely sliding without clearance along the single direction; the sliding block is linked with a displacement sensor and a laser ranger; vertical axes of the sliding block, the displacement sensor and the laser ranger are parallel to the axis of the bracket; non-contact and multi-directional measurement of a sample therein can be carried out outside the tri-axial pressure chamber; the device measures the surface distance of the sample by adopting the laser ranger; the sample is not interfered; the device is capable of measuring the sample in all directions outside the tri-axial pressure chamber; a radial deformation value of the diameter of the sample can be calculated through measured data by utilizing geometric knowledge; the error can be reduced through a multi-point measurement averaging method; and the practical deformation of the sample can be obtained according to light speed conversion.

Description

A kind of measurement mechanism and method of three axle sample radial deformations
Technical field
Involved in the present invention is a kind of radial deformation measurement mechanism and method for three axle samples, is used for the radial deformation that indoor triaxial test is measured sample.
Background technology:
It is investigated, present sample radial deformation measuring method employed both at home and abroad mainly contains the methods such as laser sensor that the plane of arrangement position is fixed in the reading of labelling, reading microscope Measurement scales spacing, local installation foil gauge, PSD laser sensor, the pressure chamber and carries out the radial deformation measurement.Most of strain testing method can produce certain interference to sample, especially for the softer sample of quality, can produce certain impact to its radial deformation.The method of optical readings and strain measurement all is the measurement to sample local deformation, and measuring accuracy and reliability are all lower, light intensity is larger to the tests affect of PSD laser sensor, bring certain error to test, the measuring method of fixing proving installation in the pressure chamber, portability is not strong, and versatility is poor on different instruments, does not use with the triaxial cell of minor diameter and measures.Traditional measurement method exist to the sample disturbance, can not contactless continuous measuring, the shortcoming such as not high, the very flexible of precision, therefore have some obstacles aspect the three axle sample axial deformations measuring.
Summary of the invention:
Technical matters to be solved by this invention provides a kind of measurement mechanism and method of three axle sample radial deformations, in order to the radial deformation of the indoor sample of Measurement accuracy triaxial pressure.
The present invention addresses the above problem the technical scheme that adopts: a kind of measurement mechanism of three axle sample radial deformations, it comprises the fixed support for location survey, comprise the locating support closely connected with the triaxial cell in this fixed support, described locating support has identical axis with the triaxial cell; Affiliated fixed support is with the slide block that is free to slide along the single direction gapless, the same displacement meter of described slide block, laser range finder interlock, the vertical axis of slide block, displacement meter and laser range finder is parallel with support bracket fastened axis, and slide block cylinder displacement meter, laser range finder rigidly fix connection, and described displacement meter and laser range finder are high-precision sensor.
A kind of method of testing of three axle sample radial deformations, it may further comprise the steps:
(1) is no less than three in the position that the outdoor selection of triaxial pressure possesses measuring condition, is evenly distributed each other as far as possible, and records each point position and pressure chamber's diameter;
(2) fixed support and pressure chamber is closely connected and fixing, connect the kinetic measurement acquisition system, measure the distance at diverse location place to the specimen height scope by laser range finder, change the measuring position, until finish;
(3) according to testing requirements, measure different constantly laser range finders to the distance of specimen surface, calculate the radial deformation value that specimen finish obtains sample according to geometrical principle, the method for averaging by multimetering can reduce error, according to the light velocity actual specimen deformation that converts.
Compared with prior art, the present invention adopts the contactless continuous measuring mode, can sample be measured in that triaxial pressure is outdoor, has solved the contact problems of fixed support and triaxial cell, by multimetering and data analysis processing method, eliminated sample and tilted on the radially impact of deformation test.The data of this measurement device also can be used for measurement and the analysis of the aspects such as the axial local deformation of three axle samples, volume of sample variation in addition.
Description of drawings
Fig. 1: proving installation front elevation; Fig. 2: proving installation vertical view
Embodiment
This measurement mechanism mainly comprises the locating support 1 for sensor localization, the fixed support 2 of installation and fixation of sensor, displacement transducer 3, laser range finder 4 and data acquisition system (DAS).Fixing between locating support 1 and the fixed support, do not rotate and relative displacement, the slide block 5 on the fixed support is fixing with the lower end of displacement transducer 3 and laser range finder 4, forms linkage, the signal of laser range finder and displacement transducer enters data acquisition system (DAS), real-time recorded data.The axis of fixed support 2, displacement meter 3 and laser range finder 4 and slide block 5 is parallel.In the measuring process, by moving up and down of slide block 5, drive laser range finder 4 and move up and down, measured to the distance of sample 7 by laser range finder 4, measuring height has displacement transducer 3 records.
A kind of method of testing of three axle sample radial deformations, it may further comprise the steps:
(1) position that 6 outer selections possess measuring condition in the triaxial cell is no less than three, is evenly distributed each other as far as possible, and records each point position and pressure chamber's diameter;
(2) fixed support and pressure chamber is closely connected and fixing, connect the kinetic measurement acquisition system, measure the distance at diverse location place to sample 7 altitude ranges by laser range finder, change the measuring position, until test is finished;
(3) according to testing requirements, measure different constantly laser range finders to the distance of specimen surface, calculate specimen finish according to geometrical principle, obtain the radial deformation value of sample, the method of averaging by multimetering can reduce error, according to the light velocity actual specimen deformation that converts.

Claims (3)

1. the measurement mechanism of an axle sample radial deformation is characterized in that the fixed support for the radial deformation measurement mechanism, and this fixed support comprises that one has the locating support of identical central axis with the triaxial cell, and locating support and triaxial cell are closely connected; This fixed support is with the slide block that is free to slide along the single direction gapless, and the same displacement transducer of slide block, laser range finder link, and the vertical axis of slide block, displacement transducer and laser range finder is parallel with the axis of support.
2. the measurement mechanism of a kind of three axle sample radial deformations as claimed in claim 1, it is characterized in that and to carry out noncontact, multi-faceted measurement at the outdoor sample to its inside of triaxial pressure, this device employing laser ranging system is measured the distance to specimen surface, do not disturb sample, this device can be measured sample in each orientation of triaxial pressure outdoor.
3. the method for testing of an axle sample radial deformation is characterized in that it may further comprise the steps:
(1) is no less than three in the position that the outdoor selection of triaxial pressure possesses measuring condition, is evenly distributed each other as far as possible, and records each point position and pressure chamber's diameter;
(2) fixed support and pressure chamber is closely connected and fixing, connect the kinetic measurement acquisition system, measure the distance at diverse location place to the specimen height scope by laser range finder, change the measuring position, until finish;
(3) according to testing requirements, measure different constantly laser range finders to the distance of specimen surface, calculate the radial deformation value that specimen finish obtains sample according to geometrical principle, the method for averaging by multimetering can reduce error, according to the light velocity actual specimen deformation that converts.
CN2012104343425A 2012-11-05 2012-11-05 Device and method for measuring radial deformation of tri-axial sample Pending CN102901460A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2012104343425A CN102901460A (en) 2012-11-05 2012-11-05 Device and method for measuring radial deformation of tri-axial sample

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2012104343425A CN102901460A (en) 2012-11-05 2012-11-05 Device and method for measuring radial deformation of tri-axial sample

Publications (1)

Publication Number Publication Date
CN102901460A true CN102901460A (en) 2013-01-30

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103486940A (en) * 2013-10-10 2014-01-01 山东师范大学 Tennis ball specification detecting device
CN105004520A (en) * 2015-08-18 2015-10-28 哈尔滨电机厂有限责任公司 Ball valve test pressure stress measuring process method
CN105277440A (en) * 2015-11-20 2016-01-27 王旭明 Device for detecting pressure resistance of air-conditioner heating tubes
CN105277439A (en) * 2015-11-19 2016-01-27 中国矿业大学 Geotechnical triaxial test sample radial deformation testing device and method
CN106404524A (en) * 2016-08-31 2017-02-15 中国地质科学院水文地质环境地质研究所 Device and method for recognizing horizontal radial deformation of static triaxial test soil sample
CN109798837A (en) * 2019-01-09 2019-05-24 煤炭科学技术研究院有限公司 A kind of hydraulic support column cylinder diameter deformation measuring device
CN112525094A (en) * 2020-11-24 2021-03-19 山东大学 Three-dimensional deformation detection device for triaxial test sample and use method thereof
CN112710549A (en) * 2020-12-15 2021-04-27 西南交通大学 Non-contact type rock-soil triaxial test piece body strain testing device

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JP4742270B2 (en) * 2006-10-16 2011-08-10 国立大学法人山口大学 Method for measuring deformation characteristics and apparatus therefor
CN102183454A (en) * 2011-03-02 2011-09-14 上海大学 Unsaturated soil tester for testing deformation of soil sample of clay in real time

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CN1319812A (en) * 2001-04-04 2001-10-31 大连理工大学 Digital image measuring method and equipment of triaxle testing sample soil deformation
JP4742270B2 (en) * 2006-10-16 2011-08-10 国立大学法人山口大学 Method for measuring deformation characteristics and apparatus therefor
CN102183454A (en) * 2011-03-02 2011-09-14 上海大学 Unsaturated soil tester for testing deformation of soil sample of clay in real time

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SOPHIE MESSERKLINGER,ERNST BLEIKER,ADRIAN ZWEIDLER: "Displacement measurement with laser scanning in triaxial testing apparatuses", 《PROCEEDINGS OF THE 16TH EUROPEAN YOUNG GEOTECHNICAL》, 31 December 2004 (2004-12-31), pages 1 - 10 *
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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103486940A (en) * 2013-10-10 2014-01-01 山东师范大学 Tennis ball specification detecting device
CN103486940B (en) * 2013-10-10 2016-05-04 山东师范大学 Tennis specification checkout gear
CN105004520A (en) * 2015-08-18 2015-10-28 哈尔滨电机厂有限责任公司 Ball valve test pressure stress measuring process method
CN105277439A (en) * 2015-11-19 2016-01-27 中国矿业大学 Geotechnical triaxial test sample radial deformation testing device and method
CN105277440A (en) * 2015-11-20 2016-01-27 王旭明 Device for detecting pressure resistance of air-conditioner heating tubes
CN105277440B (en) * 2015-11-20 2018-06-29 王旭明 A kind of air-conditioning heating tube pressure resistance detection device
CN106404524A (en) * 2016-08-31 2017-02-15 中国地质科学院水文地质环境地质研究所 Device and method for recognizing horizontal radial deformation of static triaxial test soil sample
CN106404524B (en) * 2016-08-31 2020-05-15 中国地质科学院水文地质环境地质研究所 Device and method for identifying horizontal radial deformation of soil sample in static triaxial test
CN109798837A (en) * 2019-01-09 2019-05-24 煤炭科学技术研究院有限公司 A kind of hydraulic support column cylinder diameter deformation measuring device
CN112525094A (en) * 2020-11-24 2021-03-19 山东大学 Three-dimensional deformation detection device for triaxial test sample and use method thereof
CN112710549A (en) * 2020-12-15 2021-04-27 西南交通大学 Non-contact type rock-soil triaxial test piece body strain testing device

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Application publication date: 20130130