CN102798371A - Rock volume deformation measuring sensor and rock test-piece volume deformation measuring method - Google Patents
Rock volume deformation measuring sensor and rock test-piece volume deformation measuring method Download PDFInfo
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- CN102798371A CN102798371A CN2012102946061A CN201210294606A CN102798371A CN 102798371 A CN102798371 A CN 102798371A CN 2012102946061 A CN2012102946061 A CN 2012102946061A CN 201210294606 A CN201210294606 A CN 201210294606A CN 102798371 A CN102798371 A CN 102798371A
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Abstract
The invention discloses a rock volume deformation measuring sensor. The rock volume deformation measuring sensor comprises a measuring oil cylinder, a piston, two piston rods and a displacement sensor, wherein the piston is located in the measuring oil cylinder; the measuring oil cylinder is divided into a first chamber and a second chamber; one end of each piston rod is respectively fixedly connected with the central parts of two end faces of the piston; the other ends of the two piston rods respectively stretch out of end covers at two ends of the measuring oil cylinder; the displacement sensor is arranged on an outer sidewall of the measuring oil cylinder; and a free end of a displacement measuring rod of the displacement sensor is connected with the piston rod located at an outlet end of a main oil-conveying pipeline through a connecting member. A rock test-piece volume deformation measuring method comprises the steps of: mounting a rock test-piece on a test sample platform in a tri-axial pressure chamber of a tri-axial pressure testing machine; measuring by using the rock volume deformation measuring sensor; and recording and displaying volume deformation of the rock through a control system of the tri-axial pressure testing machine.
Description
Technical field
The invention belongs to the performances of rock field tests, particularly a kind of utensil and method of the rock sample cubic deformation being carried out quantitative test.
Background technology
The cubic deformation of existing rock sample is to utilize to be installed in the vertical and horizontal extensometer on the rock sample, or is attached to the vertical and horizontal foil gauge on rock sample surface, measure the strain of its both direction respectively after, calculate the cubic deformation of rock again according to formula.Yet; Above-mentioned measuring appliance and method only are applicable to the hard rock of small deformation; Then can't measure for the soft rock that large deformation can take place, and above-mentioned measuring appliance and method recording only is the corresponding distortion of cross section in the rock, is not the real cubic deformation of rock.
Summary of the invention
The objective of the invention is to overcome the deficiency of prior art; A kind of rock volume deformation measurement sensor and rock sample cubic deformation measuring method are provided; So that can obtain the overall process data of rock sample cubic deformation in process of the test, accurately measure the real cubic deformation of rock.
Rock volume deformation measurement sensor according to the invention comprises and measures oil cylinder, piston, piston rod, displacement transducer and oil transportation main line; Piston is positioned at measures oil cylinder; Oil cylinder be will measure and first chamber and second chamber will be divided into; First chamber is provided with the first oil transportation arm that is connected with the oil transportation main line; Second chamber is provided with the second oil transportation arm that is connected with the oil transportation main line, is provided with stop valve between the joint of the oil transportation main line and the first oil transportation arm and the joint of the second oil transportation arm; Piston rod is two, and an end of two-piston bar is connected with the centre of side face of piston ring respectively, and the central lines of their center line and piston, and the other end of two-piston bar stretches out from the end cap of measuring the oil cylinder two ends respectively; Displacement transducer is installed on the lateral wall of measuring oil cylinder, and the free end of its displacement measurement bar is connected with the piston rod that is positioned at oil transportation main line endpiece through web member.
Rock volume deformation measurement sensor of the present invention, the length of its piston rod should be greater than the length of measuring oil cylinder, to satisfy the needs of measuring.
Rock volume deformation measurement sensor of the present invention, the preferred two ends of its web member are provided with the rod member or the stripe board of connecting hole.
Rock sample cubic deformation measuring method according to the invention is used rock volume deformation measurement sensor according to the invention, operates as follows:
1. rock sample is installed on the indoor sample bench of the triaxial pressure of triaxial compression test machine; The oil transportation main line endpiece of said rock volume deformation measurement sensor is connected with the petroleum pipeline of said triaxial cell; The oil transportation main line entrance point of said rock volume deformation measurement sensor is connected with supply reservoir, the signal output interface of the displacement transducer of said rock volume deformation measurement sensor is connected with the control system of triaxial compression test machine;
2. open the stop valve that is provided with on the said oil transportation main line, make the triaxial cell of first chamber, second chamber and the triaxial compression test machine of measuring oil cylinder be full of fluid;
3. according to the contingent maximum volume dilatational strain of the rock sample of preresearch estimates; The piston rod that operation is not connected with the displacement measurement bar; Piston transferred to measure the corresponding position of the contingent maximum volume dilatational strain of rock sample, close the stop valve that is provided with on the oil transportation main line then;
When 4. measuring the compression volume distortion of rock sample; The triaxial pressure that the measurement oil cylinder is imported the triaxial compression test machine continuously near the fluid in the chamber of oil transportation main line endpiece is indoor; Cause piston drives the direction motion of the displacement measurement bar of displacement transducer to piston motion to the endpiece motion of oil transportation main line, the piston rod that is connected with piston; In the motion of displacement measurement bar; Displacement transducer is to the electric signal of the control system conveying displacement measurement bar exercise data of triaxial compression test machine, and the control system of triaxial compression test machine is handled the electric signal that receives, and record also shows the compression volume distortion of rock;
When 5. measuring the expanding volume distortion of rock sample; In the indoor chamber of the continuous input measurement oil cylinder of fluid of the triaxial pressure of triaxial compression test machine near oil transportation main line endpiece; Cause piston drives the direction motion of the displacement measurement bar of displacement transducer to piston motion to the entrance point motion of oil transportation main line, the piston rod that is connected with piston; In the motion of displacement measurement bar; Displacement transducer is to the electric signal of the control system conveying displacement measurement bar exercise data of triaxial compression test machine, and the control system of triaxial compression test machine is handled the electric signal that receives, the expanding volume distortion of record and demonstration rock.
Can find out from said method; When rock sample generation compression volume is out of shape; To cause measuring oil cylinder reduces near the fluid in the chamber of oil transportation main line endpiece; Thereby the chamber volume near oil transportation main line endpiece is reduced; When rock sample expands cubic deformation; To cause measuring oil cylinder increases near the fluid in the chamber of oil transportation main line endpiece; Increase thereby make, measure oil cylinder and reduce to be worth near oil transportation main line endpiece chamber volume and deduct the triaxial compression test machine and load column and get into the indoor volume change value of triaxial pressure and then be the cubic deformation value of rock sample generation compression volume distortion, measure oil cylinder and deduct the triaxial compression test machine near oil transportation main line endpiece chamber volume added value and load column and get into the indoor volume change value of triaxial pressure then expands cubic deformation for rock sample cubic deformation value near the chamber volume of oil transportation main line endpiece.Carry out software design and in the control system of triaxial compression test machine said software is installed according to above-mentioned mechanism, the control system of triaxial compression test machine can be out of shape according to the electric signal record of displacement measurement bar exercise data and the compression volume distortion and the expanding volume of demonstration rock.
The present invention has following beneficial effect:
1, the present invention provides new methods and new surveying instrument a kind of and the different designs of prior art for the measurement of rock sample cubic deformation, and the characteristics of the method for the invention are to obtain the overall process data of rock sample cubic deformation in by course of exerting pressure and the true volume distortion of rock sample.
2, the method for the invention efficiently solves the cubic deformation problems of measurement of the soft rock with large deformation characteristic, and the utilization that can be soft rock provides reliable data support.
3, rock volume deformation measurement sensor according to the invention is not only simple in structure, and easy and simple to handle with the supporting use of triaxial compression test machine, thereby is easy to promote.
Description of drawings
Fig. 1 is the structural representation of rock volume deformation measurement sensor according to the invention;
Fig. 2 is the vertical view of Fig. 1;
Fig. 3 is the A-A cut-open view of Fig. 1;
Fig. 4 is the structural representation of the triaxial cell of triaxial compression test machine.
Among the figure, the 1-piston rod, 2-measurement oil cylinder (2-1: first chamber, 2-2: second chamber), 3-piston, 4-displacement transducer shell; 5-displacement measurement bar, 6-web member, 7-stop valve, 8-oil transportation main line, the 9-first oil transportation arm; The 10-second oil transportation arm, 11-rock sample top-loaded column, 12-triaxial cell, 13-diaphragm; The 14-rock sample, 15-rock sample bottom-loaded column, 16-triaxial cell petroleum pipeline, 17-triaxial cell base.
Embodiment
Be described further below in conjunction with the measuring method of accompanying drawing rock volume deformation measurement sensor according to the invention and rock sample cubic deformation.
In the present embodiment; The structure of rock volume deformation measurement sensor such as Fig. 1, Fig. 2, shown in Figure 3 constitute by measuring oil cylinder 2, piston 3, piston rod 1, displacement transducer, web member 6, oil transportation main line 8, the first oil transportation arm 9, the second oil transportation arm 10 and stop valve 7.
The length of measuring oil cylinder 2 is 400mm, and internal diameter is 80mm, and the external diameter of piston 3 is identical with the internal diameter nominal size of measuring oil cylinder 2, and for movingly, said piston 3 is positioned at measures oil cylinder 2, will measure oil cylinder and be divided into the first chamber 2-1 and the second chamber 2-2; One end of the first oil transportation arm 9 is connected with the first chamber 2-1; Its other end is connected with oil transportation main line 8; One end of the second oil transportation arm 10 is connected with the second chamber 2-2, and its other end is connected with oil transportation main line 8, and stop valve 7 is a high-pressure ball valve (model: MKHP-800; China sky, Yuci emerging hydraulic machine company limited produces), be arranged between the joint of joint and the second oil transportation arm of the oil transportation main line and the first oil transportation arm; Piston rod 1 is two; The length of two-piston bar is all than the long 40mm of length that measures oil cylinder 2; One end of two-piston bar is connected with the centre of piston 3 both ends of the surface respectively; And the central lines of their center line and piston 3, the other end of two-piston bar are stretched out from the end cap of measuring the oil cylinder two ends respectively; Displacement transducer is a commercial goods (model: WYDC-500L; Manufacturing enterprise: the former observation and control technology of Chinese Xiamen Ke company limited); Its range is greater than the length of measuring oil cylinder 2; Said displacement transducer is installed on the lateral wall of measuring oil cylinder, and the free end of its displacement measurement bar 5 is connected with the piston rod that is positioned at oil transportation main line 8 endpiece through web member 6, and said web member 6 is provided with the stripe board of connecting hole for two ends.
Present embodiment to the soft rock test specimen cubic deformation in triaxial compression test measure, the triaxial compression test machine model of use is: MTS815 (production of American MTS company); Use embodiment 1 described rock volume deformation measurement sensor, operate as follows:
1. rock sample 14 is installed on the indoor sample bench of the triaxial pressure of triaxial compression test machine (as shown in Figure 4); Oil transportation main line 8 endpiece of said rock volume deformation measurement sensor are connected with the petroleum pipeline 16 of said triaxial cell; Oil transportation main line 8 entrance points of said rock volume deformation measurement sensor are connected with supply reservoir, the signal output interface of the displacement transducer of said rock volume deformation measurement sensor is connected with the control system of triaxial compression test machine;
2. open the stop valve 7 that is provided with on the said oil transportation main line 8, make the triaxial cell 12 of the first chamber 2-1, the second chamber 2-2 and the triaxial compression test machine of measuring oil cylinder be full of fluid;
3. according to the contingent maximum volume dilatational strain of the rock sample of preresearch estimates; The piston rod that operation is not connected with displacement measurement bar 5; Piston 3 is transferred to and the corresponding position of the contingent maximum volume dilatational strain of rock sample, close the stop valve 7 that is provided with on the oil transportation main line 8 then;
4. operate the triaxial compression test machine; Rock sample 14 is applied confined pressure pressure; Under the effect of confined pressure pressure, the compression volume distortion takes place in rock sample 14 gradually, in this process; Measuring fluid among the second chamber 2-2 of oil cylinder 2, to import the triaxial pressure of triaxial compression test machine continuously indoor; Cause piston 3 drives the direction motion of the displacement measurement bar 5 of displacement transducer to piston motion to the endpiece motion of oil transportation main line 8, the piston rod that is connected with piston, and in 5 motions of displacement measurement bar, displacement transducer is carried the electric signal of displacement measurement bar exercise data to the control system of triaxial compression test machine; The control system of triaxial compression test machine is handled the electric signal that receives, and record also shows that the compression volume of rock is out of shape;
5. after confined pressure pressure adds to desired value; Operation triaxial compression test machine applies xial feed to rock sample 14; Destroy until rock, under the effect of xial feed, the compression volume distortion at first takes place in rock sample 14; Expand cubic deformation then; Take place in the compression volume deformation processes at rock sample 14, measuring fluid among the second chamber 2-2 of oil cylinder 2, to import the triaxial pressure of triaxial compression test machine continuously indoor, and cause piston 3 is moved to the direction of piston motion to the displacement measurement bar 5 of the endpiece motion of oil transportation main line 8, the piston rod drive displacement transducer that is connected with piston; In 5 motions of displacement measurement bar; Displacement transducer is to the electric signal of the control system conveying displacement measurement bar exercise data of triaxial compression test machine, and the control system of triaxial compression test machine is handled the electric signal that receives, and record also shows the compression volume distortion of rock; Expand in the cubic deformation process at rock sample 14; Among the second chamber 2-2 of the continuous input measurement oil cylinder 2 of fluid that the triaxial pressure of triaxial compression test machine is indoor; Cause piston 3 drives the direction motion of the displacement measurement bar 5 of displacement transducer to piston motion to the entrance point motion of oil transportation main line 8, the piston rod that is connected with piston; In 5 motions of displacement measurement bar; Displacement transducer is to the electric signal of the control system conveying displacement measurement bar exercise data of triaxial compression test machine, and the control system of triaxial compression test machine is handled the electric signal that receives, the expanding volume distortion of record and demonstration rock.
Claims (4)
1. a rock volume deformation measurement sensor is characterized in that comprising measurement oil cylinder (2), piston (3), piston rod (1), displacement transducer and oil transportation main line (8);
Piston (3) is positioned at measures oil cylinder (2); Oil cylinder be will measure and first chamber (2-1) and second chamber (2-2) will be divided into; First chamber is provided with the first oil transportation arm (9) that is connected with oil transportation main line (8); Second chamber is provided with the second oil transportation arm (10) that is connected with oil transportation main line (8), is provided with stop valve (7) between the joint of the oil transportation main line and the first oil transportation arm and the joint of the second oil transportation arm;
Piston rod (1) is two, and an end of two-piston bar is connected with the centre of side face of piston ring respectively, and the central lines of their center line and piston, and the other end of two-piston bar stretches out from the end cap of measuring the oil cylinder two ends respectively;
Displacement transducer is installed on the lateral wall of measuring oil cylinder, and the free end of its displacement measurement bar (5) is connected with the piston rod that is positioned at oil transportation main line (8) endpiece through web member (6).
2. rock volume deformation measurement sensor according to claim 1, the length that it is characterized in that said piston rod (1) is greater than the length of measuring oil cylinder (2).
3. rock volume deformation measurement sensor according to claim 1 and 2 is characterized in that said web member (6) is provided with the rod member or the stripe board of connecting hole for two ends.
4. a rock sample cubic deformation measuring method is characterized in that using any rock volume deformation measurement sensor in the claim 1 to 3, operates as follows:
1. rock sample (14) is installed on the indoor sample bench of the triaxial pressure of triaxial compression test machine; Oil transportation main line (8) endpiece of said rock volume deformation measurement sensor is connected with the petroleum pipeline (16) of said triaxial cell; Oil transportation main line (8) entrance point of said rock volume deformation measurement sensor is connected with supply reservoir, the signal output interface of the displacement transducer of said rock volume deformation measurement sensor is connected with the control system of triaxial compression test machine;
2. open said oil transportation main line (8) and go up the stop valve (7) that is provided with, make the triaxial cell (12) of first chamber (2-1), second chamber (2-2) and the triaxial compression test machine of measuring oil cylinder be full of fluid;
3. according to the contingent maximum volume dilatational strain of the rock sample of preresearch estimates; The piston rod that operation is not connected with displacement measurement bar (5); Piston (3) transferred to test the corresponding position of the contingent maximum volume dilatational strain of rock sample, close oil transportation main line (8) then and go up the stop valve (7) that is provided with;
When 4. measuring the compression volume distortion of rock sample; The triaxial pressure that measurement oil cylinder (2) is imported the triaxial compression test machine continuously near the fluid in the chamber of oil transportation main line (8) endpiece is indoor; Cause piston (3) drives the direction motion of the displacement measurement bar (5) of displacement transducer to piston motion to the endpiece motion of oil transportation main line (8), the piston rod that is connected with piston; In displacement measurement bar (5) motion; Displacement transducer is carried the electric signal of displacement measurement bar exercise data to the control system of triaxial compression test machine; The control system of triaxial compression test machine is handled the electric signal that receives, and record also shows that the compression volume of rock is out of shape;
When 5. measuring the expanding volume distortion of rock sample; In the indoor chamber of the continuous input measurement oil cylinder of fluid (2) of the triaxial pressure of triaxial compression test machine near oil transportation main line (8) endpiece; Cause piston (3) drives the direction motion of the displacement measurement bar (5) of displacement transducer to piston motion to the entrance point motion of oil transportation main line (8), the piston rod that is connected with piston; In displacement measurement bar (5) motion; Displacement transducer is carried the electric signal of displacement measurement bar exercise data to the control system of triaxial compression test machine; The control system of triaxial compression test machine is handled the electric signal that receives, the expanding volume distortion of record and demonstration rock.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210294606.1A CN102798371B (en) | 2012-08-17 | 2012-08-17 | Rock volume deformation measuring sensor and rock test-piece volume deformation measuring method |
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| CN201210294606.1A CN102798371B (en) | 2012-08-17 | 2012-08-17 | Rock volume deformation measuring sensor and rock test-piece volume deformation measuring method |
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| CN102798371A true CN102798371A (en) | 2012-11-28 |
| CN102798371B CN102798371B (en) | 2014-12-10 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106066298A (en) * | 2016-06-03 | 2016-11-02 | 南京工业大学 | Based on flat sample unsaturated soil triaxial test volume measurement device and measuring method |
| CN107063882A (en) * | 2017-05-15 | 2017-08-18 | 四川大学 | A kind of Rock Mechanics Test system for simulating deep ground environment |
| CN109029235A (en) * | 2018-06-26 | 2018-12-18 | 山东科技大学 | A kind of mechanical swelling type hole wall deformation sensor and monitoring application method for drilling |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106066298A (en) * | 2016-06-03 | 2016-11-02 | 南京工业大学 | Based on flat sample unsaturated soil triaxial test volume measurement device and measuring method |
| CN106066298B (en) * | 2016-06-03 | 2017-06-06 | 南京工业大学 | Based on flat sample unsaturated soil triaxial test volume measurement device and measuring method |
| CN107063882A (en) * | 2017-05-15 | 2017-08-18 | 四川大学 | A kind of Rock Mechanics Test system for simulating deep ground environment |
| CN107063882B (en) * | 2017-05-15 | 2023-03-03 | 四川大学 | Rock mechanics experimental system for simulating deep ground environment |
| CN109029235A (en) * | 2018-06-26 | 2018-12-18 | 山东科技大学 | A kind of mechanical swelling type hole wall deformation sensor and monitoring application method for drilling |
| WO2020000990A1 (en) * | 2018-06-26 | 2020-01-02 | 山东科技大学 | Mechanical expansive type hole wall deformation sensor for hole drilling, and monitoring and using method |
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Inventor after: Liu Jianfeng Inventor after: Xie Heping Inventor after: Xu Jin Inventor after: Ju Yang Inventor after: Deng Jianhui Inventor after: Wu Gang Inventor after: Chen Liang Inventor before: Liu Jianfeng Inventor before: Xie Heping Inventor before: Xu Jin |
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