CN105043868A - Load-sensitive rock core loading method based on CT (computed tomography) rapid imaging - Google Patents
Load-sensitive rock core loading method based on CT (computed tomography) rapid imaging Download PDFInfo
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Abstract
The invention discloses a load-sensitive rock core loading method based on CT (computed tomography) rapid imaging, which is mainly applied to the test on pressure resistance performance of a rock core in a laboratory so as to acquire a whole-course stress-strain curve of the rock core. The method comprises: in the rock core loading process, carrying out, by a microfocus CT scanner, the real-time monitoring on an axial strain capacity and an annular strain capacity on a surface fixed position of the rock core, comparing and calculating, by a host computer device, the strain capacities of scanning images at different moments, feeding back a calculation result to a mechanical loading device, adjusting a loading way of the mechanical loading device, and automatically adjusting the loading way of the loading device from a displacement control to a stress control when the axial strain capacity or annular strain capacity on a surface monitoring point of the rock core reaches a set threshold value, to obtain the whole-course stress-strain curve of the rock core. By adopting the load-sensitive rock core loading method, the post-peak deformation and strength characteristics of the rock core can be precisely acquired, so that a favorable condition is provided for researching and developing key technologies such as an operation form, a detection means and the like.
Description
Technical field
The present invention relates to core loading technique and Industrial computerized tomography, particularly relate to a kind of load-sensitive core loading method based on CT fast imaging.
Background technology
Rock is formed as the earth, the product of earth's crust geological activity derivation, is widely used in the engineering construction fields such as all kinds of structure foundation, country rock or building materials.Compressive strength, as one of the important parameter of physical-mechanical properties of rock, directly can reflect the hardness of rock.In mine, geology, metallurgy, railway, highway, water power water conservancy and other engineering construction fields, compressive strength of rock divides hardness degree of rock, excavation classification determine the important evidence of drillability etc.
But, under traditional compression test of rock machine condition, before test specimen reaches peak strength, the distortion of test specimen is progressively and slowly, after reaching peak strength, to be there is sudden destruction in test specimen, test specimen is burst apart, and rock fragment four sides flies, and with the very large sound, test stops suddenly, can only obtain the half way stress-strain diagram of rock sample, cannot obtain its post-peak deformation and strength characteristic.At present, more existing researchs are required for the omnidistance compression test how meeting rock.What major part was studied focuses on the rigidity how improving testing machine, has occurred rigidity matching for this reason.But rigidity matching loading environment is single, single displacement loading or stress loading condition can only be adopted for special test object, be unfavorable for obtaining post-peak deformation and strength characteristic accurately; Require higher to machinery loading devices such as testing machines, testing equipment is complicated, bulky, is not suitable for promoting the use of of general mechanism; The loading velocity that can not be suitable for according to the variety classes setting of test core or stress condition, equipment performance also needs to continue to improve.
Therefore, how to improve test loading environment and become important research contents with the omnidistance compression stress strain data obtaining core.
Summary of the invention
The object of the invention is to, a kind of load-sensitive core loading method based on CT fast imaging is provided, based on the method, Real-Time Monitoring can be carried out to the axial strain amount and hoop strain amount that load core face fixed position place by Microfocus X-ray CT scanner, and by master control computing equipment, result feedback is regulated its load mode, the farthest complete stress-strain curve of Obtaining Accurate load-sensitive core to machinery loading device.
The technical scheme that its technical matters of the present invention adopts is:
A kind of load-sensitive core loading method based on CT fast imaging, required loading system comprises: master control computing equipment, heavy metal insulated chamber, industry CT scanning loading experiment platform and Microfocus X-ray CT scanner, the vertical turntable of described industry CT scanning loading experiment platform is provided with machinery loading device, described master control computing equipment is connected by wireless network is long-range with described machinery loading device, described master control computing equipment is connected by the data acquisition unit of wireline cable with described Microfocus X-ray CT scanner, described Microfocus X-ray CT scanner carries out Real-Time Monitoring to the axial strain amount at described loading core face fixed position place and hoop strain amount, and by after the process of described master control computing equipment by result feedback to described machinery loading device regulate its load mode, with the complete stress-strain curve of Obtaining Accurate load-sensitive core.
Above-mentioned a kind of based in the load-sensitive core loading method of CT fast imaging, preferred described industry CT scanning loading experiment platform is positioned at heavy metal insulated chamber, its vertical direction is provided with machinery loading device, machinery loading device is connected with the first wireless transceiver, and comprises sensor and embedded processing systems.
Above-mentioned a kind of based in the load-sensitive core loading method of CT fast imaging, preferred described core face is provided with axial strain amount monitoring point or hoop strain amount monitoring point, axial strain amount monitoring point should be uniformly distributed in core axial centre two ends, and hoop strain amount monitoring point is at close core near middle.
Above-mentioned a kind of based in the load-sensitive core loading method of CT fast imaging, preferred described Microfocus X-ray CT scanner comprises X-ray tube (source), fan-shaped x-ray beam, data acquisition unit, rotating disk on Rotation Controllers and Rotation Controllers, rotating disk on Rotation Controllers is positioned at above Rotation Controllers, X-ray tube (source) launches fan-shaped x-ray beam, data acquisition unit image data, Real-Time Monitoring is carried out to the axial strain amount at core face fixed position place and hoop strain amount, and the monitoring result on data acquisition unit is transferred to described master control computing equipment by wireline cable.
Above-mentioned a kind of based in the load-sensitive core loading method of CT fast imaging, preferred described master control computing equipment is personal computer, be connected with the second wireless transceiver, be connected with described wireless receiving module by wireline cable, be connected by the data acquisition unit of wireline cable with described Microfocus X-ray CT scanner, its bus is connected with human-computer interface module, master control computing equipment can set dependent variable change threshold, when described core face monitoring point axial strain amount or hoop strain amount arrive setting threshold value, described master control computing equipment changes Stress Control by regulating the load mode of described industry CT scanning loading experiment platform into by Bit andits control.
Relative in prior art, the present invention has following beneficial effect:
By Microfocus X-ray CT scanner, Real-Time Monitoring is carried out to the axial strain amount and hoop strain amount that load core face fixed position place, and by master control computing equipment, result feedback is regulated its load mode, the farthest complete stress-strain curve of Obtaining Accurate load-sensitive core to machinery loading device.Instant invention overcomes for a long time because the insufficient rigidity of " soft " property testing machine causes the sudden destruction of test specimen thus cannot obtain the defect of its whole English teaching, can accurately obtain core post-peak deformation and strength characteristic, the research and development for the gordian technique such as operation form and detection means provide favourable condition.
Accompanying drawing explanation
When considered in conjunction with the accompanying drawings, by referring to detailed description below, more completely can understand the present invention better and easily learn wherein many adjoint beneficial effects, but accompanying drawing described herein is used to provide a further understanding of the present invention, form a part of the present invention, schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention, wherein:
Fig. 1 is the simple physical structural representation of the auto-loading system embodiment of the present invention's industry CT scanning used loading experiment platform;
Fig. 2 is the present invention's Microfocus X-ray CT scanner used vertical view;
Fig. 3 is the present invention's core layout of the monitoring points used position view.
Description of reference numerals: 110-industry CT scanning loading experiment platform; 120-heavy metal insulated chamber; 130-master control computing equipment; 1-data acquisition unit; 2-Rotation Controllers; Rotating disk on 3-Rotation Controllers; 4-fan-shaped x-ray beam; 5-X ray tube (source); 6-core; 7-axial strain monitoring point; 8-hoop strain monitoring point; 9-Microfocus X-ray CT scanner.
Embodiment
For enabling above-mentioned purpose of the present invention, feature and advantage become apparent more, and below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
As Fig. 1 ~ 3, Fig. 1 is the simple physical structural representation of the auto-loading system embodiment of the present invention's industry CT scanning used loading experiment platform, Fig. 2 is the present invention's Microfocus X-ray CT scanner used vertical view, Fig. 3 is the present invention's core layout of the monitoring points used position view, this core loading system comprises the industry CT scanning loading experiment platform 110 being positioned at heavy metal insulated chamber 120, master control computing equipment 130, core 6 and Microfocus X-ray CT scanner, described Microfocus X-ray CT scanner 9 comprises X-ray tube (source) 5, fan-shaped x-ray beam 4, data acquisition unit 1, rotating disk 3 on Rotation Controllers 2 and Rotation Controllers, described core 6 is arranged on the rotating disk 3 on Rotation Controllers, the surface of described core 6 is provided with axial strain amount monitoring point 7 or hoop strain amount monitoring point 8.The vertical turntable of described industry CT scanning loading experiment platform 110 is provided with machinery loading device, described master control computing equipment 130 is connected by the data acquisition unit 1 of wireline cable with described Microfocus X-ray CT scanner 9, described master control computing equipment 130 is connected with described machinery loading device long distance wireless, and dependent variable result of calculation is fed back to described machinery loading device, load motion with the scanning controlling described industry CT scanning loading experiment platform 110.
In order to ensure that Microfocus X-ray CT scanner 9 accurately can carry out dependent variable monitoring to core 6 in real time, core 6 surface is provided with axial strain amount monitoring point 7 or hoop strain amount monitoring point 8, axial strain amount monitoring point 7 should be uniformly distributed in core axial centre two ends, and hoop strain amount monitoring point 8 should be chosen near core near middle as far as possible.
Wherein, core 6 can be actual rock material, or is simulation rock material; Core 6 can be designed to: diameter 25mm, is highly the right cylinder of 50mm; The machinery loading device be positioned on the vertical turntable of industry CT scanning loading experiment platform 110 can realize the axial force load automatically loading maximum 2 tons; The minimum scanning resolution of Microfocus X-ray CT scanner 9 can reach 5 μm, and scan image interval is about 8 μ s.
A kind of load-sensitive core loading method example based on CT fast imaging
Further the specific embodiment of the present invention is described in detail below in conjunction with Fig. 2 and Fig. 3.
The present embodiment loads the starting stage at core, Microfocus X-ray CT scanner is namely to axial strain amount monitoring point 7 or the hoop strain amount monitoring point 8 enforcement monitoring rapid scanning on core 6 surface, scan image transfers to master control computing equipment 130 by data acquisition unit 1 through wireline cable, the bus of master control computing equipment 130 is connected with human-computer interface module, by the mode of man-machine interaction, receive axial strain amount and the hoop strain amount situation of change at the core face fixed position place that the steering order that sends of operating personnel and the stress state showing described machinery loading device and described Microfocus X-ray CT scanner 9 are monitored, and real-time analysis is carried out to the scan image of transmission, calculate axial strain amount changing value or the hoop strain amount changing value of monitoring point, dependent variable change threshold that can be suitable according to the different set of core 6 kind in advance in the data processing module of master control computing equipment 130, when the axial strain amount changing value of monitoring point or hoop strain amount changing value reach this threshold value, namely show that core has arrived its peak strength, result of calculation is fed back to described machinery loading device and regulates its load mode by described master control computing equipment 130, the load mode of core 6 will be adjusted to Stress Control by Bit andits control automatically, and according to the image of Microfocus X-ray CT scanner 9 rapid scannings, carry out the real-time adjustment of core 6 loading stress size, to obtain the strength characteristic of core 6 after peaks violate, finally obtain the omnidistance compressive stress strain curve of described core 6.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the technology of the present invention principle; can also make some improvement and replacement, these improve and replace and also should be considered as protection scope of the present invention.
Claims (5)
1. the load-sensitive core loading method based on CT fast imaging, comprise core, master control computing equipment, heavy metal insulated chamber, industry CT scanning loading experiment platform and Microfocus X-ray CT scanner, it is characterized in that, be positioned on the rotating disk of industry CT scanning loading experiment platform of heavy metal insulated chamber described in described core is arranged on, described Microfocus X-ray CT scanner carries out Real-Time Monitoring to the axial strain amount at described core face fixed position place and hoop strain amount, and carry out not the comparing calculation of dependent variable between scan image in the same time by described master control computing equipment, then result of calculation fed back to the machinery loading device of described industry CT scanning loading experiment platform and regulate its load mode, when described core face monitoring point axial strain amount or hoop strain amount arrive setting threshold value, the load mode of described charger will be adjusted to Stress Control by Bit andits control automatically, to obtain the omnidistance compressive stress strain curve of described core.
2. a kind of load-sensitive core loading method based on CT fast imaging according to claim 1, it is characterized in that, described industry CT scanning loading experiment platform is positioned at heavy metal insulated chamber, its vertical direction is provided with machinery loading device, machinery loading device is connected with the first wireless transceiver, and comprises sensor and embedded processing systems.
3. a kind of load-sensitive core loading method based on CT fast imaging according to claim 1, it is characterized in that, described core face is provided with axial strain amount monitoring point or hoop strain amount monitoring point, axial strain amount monitoring point should be uniformly distributed in core axial centre two ends, and hoop strain amount monitoring point is at close core near middle.
4. a kind of load-sensitive core loading method based on CT fast imaging according to claim 1, it is characterized in that, described Microfocus X-ray CT scanner comprises X-ray tube (source), fan-shaped x-ray beam, data acquisition unit, rotating disk on Rotation Controllers and Rotation Controllers, rotating disk on Rotation Controllers is positioned at above Rotation Controllers, X-ray tube (source) launches fan-shaped x-ray beam, data acquisition unit image data, Real-Time Monitoring is carried out to the axial strain amount at core face fixed position place and hoop strain amount, and the monitoring result on data acquisition unit is transferred to described master control computing equipment by wireline cable.
5. a kind of load-sensitive core loading method based on CT fast imaging according to claim 1, it is characterized in that, described master control computing equipment is personal computer, be connected with the second wireless transceiver, be connected with described wireless receiving module by wireline cable, be connected by the data acquisition unit of wireline cable with described Microfocus X-ray CT scanner, its bus is connected with human-computer interface module, master control computing equipment can set dependent variable change threshold, when described core face monitoring point axial strain amount or hoop strain amount arrive setting threshold value, described master control computing equipment changes Stress Control by regulating the load mode of described industry CT scanning loading experiment platform into by Bit andits control.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106053237A (en) * | 2016-08-10 | 2016-10-26 | 山东大学 | Seismic oscillation simulation testing machine for macroscopic and microscopic damage joint tracking of rock mass and method thereof |
| CN109900461A (en) * | 2019-02-27 | 2019-06-18 | 东软医疗系统股份有限公司 | A kind of CT swivel plate method for testing security and device |
| CN112204386A (en) * | 2018-05-23 | 2021-01-08 | 沙特阿拉伯石油公司 | Method and apparatus for CT scanning of longer whole core |
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2015
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106053237A (en) * | 2016-08-10 | 2016-10-26 | 山东大学 | Seismic oscillation simulation testing machine for macroscopic and microscopic damage joint tracking of rock mass and method thereof |
| CN112204386A (en) * | 2018-05-23 | 2021-01-08 | 沙特阿拉伯石油公司 | Method and apparatus for CT scanning of longer whole core |
| CN109900461A (en) * | 2019-02-27 | 2019-06-18 | 东软医疗系统股份有限公司 | A kind of CT swivel plate method for testing security and device |
| CN109900461B (en) * | 2019-02-27 | 2020-12-01 | 东软医疗系统股份有限公司 | Method and device for testing safety of CT rotating plate |
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