CN103512816B - Real-time measuring method for rock sample damage in circulation loading process - Google Patents

Real-time measuring method for rock sample damage in circulation loading process Download PDF

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CN103512816B
CN103512816B CN201310480353.1A CN201310480353A CN103512816B CN 103512816 B CN103512816 B CN 103512816B CN 201310480353 A CN201310480353 A CN 201310480353A CN 103512816 B CN103512816 B CN 103512816B
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rock
titration
rock sample
sample
dilation angle
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CN201310480353.1A
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CN103512816A (en
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刘杰
郭金龙
李建林
唐亮
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三峡大学
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Abstract

The invention discloses a real-time measuring method for rock sample damage in a circulation loading process. The real-time measuring method comprises the following steps: 1) drawing a relational graph of rock porosity and titration diffusion radius of rock through experiment, and representing internal damage of the rock from the graph; 2) drawing a relational graph of the titration diffusion radius and an axial pressure value of the rock sample in the loading process; 3) obtaining the change of the porosity of the rock sample in the loading process from the relational graph of the titration diffusion radius and the axial pressure value of the rock sample in the loading process, obtained in the step 2), and the relational graph of the rock porosity and the titration diffusion radius of rock, obtained in the step 1), so as to obtain the damage degree in different positions of the rock sample, and realize real-time measurement on the damage of the rock sample in the circulation loading process. Due to the adoption of the real-time measuring method for rock sample damage in the circulation loading process, the change of the porosity of the rock in the stress process is reflected through the appearance phenomenon of the rock surface through a nondestructive testing technique, so that the damage degree of the rock in the stress process is represented.

Description

The method for real-time measurement of rock sample damage in a kind of CYCLIC LOADING process
Technical field
The present invention relates to a kind of rock sample damage measuring method, the method for real-time measurement of rock sample damage in especially a kind of CYCLIC LOADING process.
Background technology
In the process of rock stress destruction be one from micro-damage gradually to rock sample destroy damage accumulation process, the damage of rock then reflects the destruction situation of rock in loading process, and the damage process adopting the method without detriment to rock sample to obtain reflection rock has just become a difficult problem in engineering.Nowadays use more non-destructive testing method to adopt ultrasonic velocity to obtain rock interior and whether have damage, but the relevant position of rock sample damage can not be reflected, and the method for its test is comparatively loaded down with trivial details, the damage status testing out rock that can not be real-time.
Summary of the invention
Technical matters to be solved by this invention is to provide the method for real-time measurement of rock sample damage in a kind of CYCLIC LOADING process, adopting this Dynamic Non-Destruction Measurement to characterize rock degree of injury in loading process with the apparent phenomenon of rock surface reflection rock in the situation of change of loading process mesoporosity rate, causing damage of rock to provide a simple and practical method for measuring rock mass in later application to engineering practice by terrestrial stress effect.
For solving the problems of the technologies described above, the technical solution adopted in the present invention is: the method for real-time measurement of rock sample damage in a kind of CYCLIC LOADING process, and the method comprises the following steps:
1) by quantitative solution dilation angle that after titration, solution is formed on its surface on rock sample as the index evaluating rock sample process of osmosis, carry out experiment drafting rock porosity and titration dilation angle graph of a relation, from figure, characterize the internal injury of rock;
2) CYCLIC LOADING is carried out to rock sample, the rock sample of quantitative solution after loading through different pressures is adopted to carry out titration, the dilation angle that after obtaining titration, solution is formed on its surface, draws out rock sample titration dilation angle and axle pressure value graph of a relation in loading procedure;
3) by step 2) rock sample that the obtains rock porosity that titration dilation angle and axle pressure value graph of a relation and step 1) obtain in loading procedure and titration dilation angle graph of a relation learn the situation of change of rock sample in loading procedure mesoporosity rate, thus draw the degree of the damaged of rock sample diverse location, realize the real-time measurement of rock sample damage in CYCLIC LOADING process.
Step 1) is made up of following steps:
1-1) measure indoor temperature by temperature and utilize air-conditioning to adjust the temperature to preference temperature, adopting hygrometer measuring chamber humidity simultaneously, regulate humidity at optimum range with air steamer and lime;
1-2) get screening rock sample to be measured some, polished in face to be titrated gently with whetstone, make it not observe obvious concavo-convex place, then surface debris is blown away in electricity consumption.Titration clicks each place, upper and lower end face of boring sample, and side is selected 3-4 points;
1-3) prepare the colored solutions do not reacted with rock sample, the rock sample handled well is put into titration apparatus and is fixed, in beaker, extract appropriate colored solutions with microlitre meter, after liquid level is reduced to zero in all capillary burettes, takes out rock sample section;
The survey radius template that 1-4) utilization prepares is positioned over rock section upper record titration radius and takes the penetratable shape of final titration formation with camera, show that the irregular figure of the process of dripping formation is respectively to radius from surveying radius template, the porosity measurement method that the porosity of section rock sample is conventional measures;
1-5) by the titration of many groups, and often group tests the difference all carrying out avoiding individual discrete type to cause on same rock sample as far as possible, the titration dilation angle size of statistics different porosities size rock sample, draw rock porosity and titration dilation angle graph of a relation, from figure, characterize the internal injury of rock.
Step 1-4) in the porosity measurement method of routine that adopts be pycnometer method.
Step 2) be made up of following steps:
2-1) measure indoor temperature by temperature and utilize air-conditioning to adjust the temperature to preference temperature, adopting hygrometer measuring chamber humidity simultaneously, regulate humidity at optimum range with air steamer and lime;
2-2) choose rock sample, choose and drill through and the sandstone sample of polishing qualified, specimen size is diameter 50mm, and height 100mm, requires sample end surface flatness deviation, and height tolerance meets according to code requirement, and its porosity recorded between two difference is not more than 10%;
Titration 2-3) must be carried out in the side of rock to do late time data contrast before carrying out uniaxial compression: blow away surface debris with hair-dryer after with dry sanding paper wiping rock surface, be positioned on table by the rock processed, select the experiment measuring point of rock side faces; 10ml solution is got with microlitre meter, the syringe needle of microlitre meter is contacted with rock surface, solution is slowly dripped to rock side faces, solution to be titrated takes off rock sample after infiltrating rock completely, covering at rock side faces with survey radius template, take be graphics shape with camera, showing that the irregular figure of the process of dripping formation is respectively to radius from surveying radius template, calculate three experiment measuring points titration dilation angle value under 0MPa, clean up the colored solutions on rock sample surface;
Stop after 2-4) control instrument is loaded on 20MPa from 0MPa in experimental machine loading, keep rock axially loaded constant, grind gently with dry sanding paper and wipe surface of test piece, blow away surface debris with hair-dryer.Get with microlitre meter solution 10 microlitre prepared and be slowly injected in step 2-3) in the experiment measuring point of rock side faces chosen, solution to be injected finally infiltrates the titration of rock interior trailing flank to be completed, turn off rock compressed instrument take out rock sample and survey radius template is carefully covered rock side faces, and take be graphics shape with camera, show that the irregular figure of the process of dripping formation is respectively to radius from surveying radius template, calculate three experiment measuring points titration dilation angle value under 20MPa, clean up the colored solutions on rock sample surface;
2-5) repeat step 2-4) obtain three experiment measuring points titration dilation angle value under 40MPa, clean up the colored solutions on rock sample surface;
2-6) repeat step 2-4) obtain three experiment measuring points titration dilation angle value under 60MPa;
2-7) according to step 2-4), 2-5), 2-6) different pressures (0MPa, 20MPa, 40,60MPa) under titration dilation angle value draw out rock sample titration dilation angle and axle pressure value graph of a relation in loading procedure.
In above-mentioned steps, by the solution taken with camera rock sample surface institute be contrast with the grid of template after shape AUTO CAD software describes thus count the area S of be shape, recycle area formula obtain the mean radius r of titration, i.e. titration dilation angle.
Method of the present invention can measure the damage process change of rock in loading process in real time, well-known porosity is an important parameter of reflection rock character, its porosity size of specific rock sample is general also in some interval ranges, rock its porosity in loading procedure also can change due to stressed effect, and it is variant at the diverse location of rock, namely the damage of rock invariably accompanies the change of porosity, therefore has corresponding theoretical foundation from the damage of the change reflection rock of rock porosity.
Method of the present invention is then consider, when the quantitative solution diffusion shape that after titration, solution is formed on its surface on rock, dilation angle (or mean radius) are as the index evaluating process of osmosis, to reflect the relation between itself and rock porosity with this technology without detriment to rock.And causing inner structure to become tight when causing rock interior to damage after the stressed effect of rock, rock porosities now etc. also can change because of stressed effect, then the shape formed at rock surface when solution, radius change equally.
The method for real-time measurement of rock sample damage in a kind of CYCLIC LOADING process provided by the invention, beneficial effect is as follows:
1, Non-Destructive Testing is achieved, checking measurements process is without the need to destroying sample, and general porosity detection technique will damage test specimen usually, the method can detect the damage of rock situation of any instant of loading procedure in real time, and owing to being non-destructive testing, the degree of injury of rock different parts can be reflected by organizing experiment acquisition multi-group data more.
2, by the picture that AUTO CAD software process camera takes, adopt template transformed area to obtain titration dilation angle, this process can convert surface area to the area of plane, and the value obtained is also more accurate.
3, adopt the advantage surveying radius template: when titration face is surface level, its titration dilation angle generally in more regular circle or ellipse, utilizes the instruments such as milscale can obtain result easily.And when titration face is arcwall face, such as, during cylindrical side, utilize the instruments such as milscale to measure, now utilize template to read dilation angle by faster, and result is more accurate.
4, this measuring method axially can carry out multi-point sampler at rock sample, to the reflection of rock sample character comprehensively, thus reduces the impact of the size effect that rock size causes, thus draws the different distance point degree of impairment of rock sample at Impact direction and stress point.
5, low cost, without the need to high cost instrument and instrument, detection mode is simple, and the Rock Damage testing result differed greatly for porosity has expression power very intuitively, and discrimination is very high.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described:
Fig. 1 is step 1-2 of the present invention) in the schematic diagram of three rock samples chosen;
Fig. 2 is the rock porosity drawn out of step 1) of the present invention and titration dilation angle graph of a relation;
Fig. 3 is step 2 of the present invention) at the schematic diagram of rock sample, rock sample has been chosen three experiment measuring points, one, upper end, medial end portions one, one, bottom;
Fig. 4 is step 2 of the present invention) rock sample titration dilation angle and the axle pressure value graph of a relation in loading procedure drawn out.
Embodiment
A method for real-time measurement for rock sample damage in CYCLIC LOADING process, the method is made up of following steps:
1) by quantitative solution dilation angle that after titration, solution is formed on its surface on rock sample as the index evaluating rock sample process of osmosis, carry out experiment drafting rock porosity and titration dilation angle graph of a relation, from figure, characterize the internal injury of rock.
Step 1) is made up of following steps:
1-1) measure indoor temperature by temperature and utilize air-conditioning to adjust the temperature to preference temperature (generally getting indoor temperature at 20 DEG C-23 DEG C), adopting hygrometer measuring chamber humidity simultaneously, regulate humidity at optimum range with air steamer and lime;
1-2) get three, screening rock sample to be measured (as shown in Figure 1), polished in face to be titrated gently with whetstone, make it not observe obvious concavo-convex place, then surface debris is blown away in electricity consumption.Titration clicks each place, upper and lower end face of boring sample, and side is selected 3-4 points;
1-3) prepare the red solution do not reacted with rock sample and (adopt allured red pigment, because it is red, easily obviously observe out the shape spread on rock sample, do not react with rock, pigment and water are mixed in beaker according to 1:500 ratio, after stirring, obtain red solution), the rock sample handled well is put into titration apparatus and is fixed, in beaker, extract appropriate colored solutions with microlitre meter, after liquid level is reduced to zero in all capillary burettes, takes out rock sample section;
The survey radius template that 1-4) utilization prepares is positioned over rock section and above records titration radius and the penetratable shape taking final titration formation with camera, show that the irregular figure of the process of dripping formation is respectively to radius from surveying radius template.The porosity measurement method that the porosity of section rock sample is conventional measures, and the porosity obtaining three groups of rock samples is respectively 6.22%, 7.23%, 11.21%;
1-5) by the titration of three groups, and often group tests the difference all carrying out avoiding individual discrete type to cause on same rock sample as far as possible, the titration dilation angle size of statistics different porosities size rock sample, draw rock porosity and titration dilation angle graph of a relation (as shown in Figure 2), from figure, characterize the internal injury of rock.
Step 1-4) in the porosity measurement method of routine that adopts be pycnometer method.
2) CYCLIC LOADING is carried out to rock sample, the rock sample of quantitative solution after loading through different pressures is adopted to carry out titration, the dilation angle that after obtaining titration, solution is formed on its surface, draws out rock sample titration dilation angle and axle pressure value graph of a relation in loading procedure.
Step 2) be made up of following steps:
2-1) utilize air-conditioning to adjust the temperature to preference temperature (generally get indoor temperature at 20 DEG C---23 DEG C) by temperature measurement indoor temperature, adopt hygrometer measuring chamber humidity simultaneously, regulate humidity at optimum range with air steamer and lime;
2-2) choose rock sample (as shown in Figure 3), choose and drill through and the sandstone sample of polishing qualified, specimen size is diameter 50mm, height 100mm, require sample end surface flatness deviation, height tolerance meets according to code requirement, and its porosity recorded between two difference is not more than 10%;
Titration 2-3) must be carried out in the side of rock to do late time data contrast before carrying out uniaxial compression: after with dry sanding paper wiping rock surface, blow away surface debris with hair-dryer, the rock processed is positioned on table, select the experiment measuring point 1 of rock side faces, 2,3(as shown in Figure 3); 10ml solution is got with microlitre meter, the syringe needle of microlitre meter is contacted with rock surface, solution is slowly dripped to rock side faces, solution to be titrated takes off rock sample after infiltrating rock completely, covering at rock side faces with survey radius template, take be graphics shape with camera, showing that the irregular figure of the process of dripping formation is respectively to radius from surveying radius template, calculate three experiment measuring points 1,2,3(as shown in Figure 3) titration dilation angle value under 0MPa, clean up the colored solutions on rock sample surface;
Stop after 2-4) control instrument is loaded on 20MPa from 0MPa in experimental machine loading, keep rock axially loaded constant, grind gently with dry sanding paper and wipe surface of test piece, blow away surface debris with hair-dryer.Get with microlitre meter solution 10 microlitre prepared and be slowly injected in step 2-3) in the experiment measuring point of rock side faces chosen, solution to be injected finally infiltrates the titration of rock interior trailing flank to be completed, turn off rock compressed instrument take out rock sample and survey radius template is carefully covered rock side faces, and take be graphics shape with camera, show that the irregular figure of the process of dripping formation is respectively to radius from surveying radius template, calculate three experiment measuring points 1,2,3(as shown in Figure 3) titration dilation angle value under 20MPa, clean up the colored solutions on rock sample surface;
2-5) repeat step 2-4) obtain three experiment measuring points 1,2,3(as shown in Figure 3) titration dilation angle value under 40MPa, clean up the colored solutions on rock sample surface;
2-6) repeat step 2-4) obtain three experiment measuring points 1,2,3(as shown in Figure 3) titration dilation angle value under 60MPa;
Statistics above-mentioned steps 2-3), 2-4), 2-5) and often group axle pressure 2-6) under the data obtained statistics as follows:
The dilation angle value of rock sample under the axially different pressure of table one
2-7) according to step 2-4), 2-5), 2-6) different pressures (0MPa, 20MPa, 40,60MPa) under titration dilation angle value draw out rock sample titration dilation angle and axle pressure value graph of a relation (as shown in Figure 4) in loading procedure.
In above-mentioned steps, by the solution taken with camera rock sample surface institute be contrast with the grid of template after shape AUTO CAD software describes thus count the area S of be shape, recycle area formula obtain the mean radius r of titration, i.e. titration dilation angle.
3) by step 2) rock sample that the obtains rock porosity that titration dilation angle and axle pressure value graph of a relation and step 1) obtain in loading procedure and titration dilation angle graph of a relation learn the situation of change of rock sample in loading procedure mesoporosity rate, thus draw the degree of the damaged of rock sample diverse location, realize the real-time measurement of rock sample damage in CYCLIC LOADING process.

Claims (5)

1. the method for real-time measurement of rock sample damage in CYCLIC LOADING process, is characterized in that the method comprises the following steps:
1) by quantitative solution dilation angle that after titration, solution is formed on its surface on rock sample as the index evaluating rock sample process of osmosis, carry out experiment drafting rock porosity and titration dilation angle graph of a relation, from figure, characterize the internal injury of rock;
2) CYCLIC LOADING is carried out to rock sample, the rock sample of quantitative solution after loading through different pressures is adopted to carry out titration, the dilation angle that after obtaining titration, solution is formed on its surface, draws out rock sample titration dilation angle and axle pressure value graph of a relation in loading procedure;
3) by step 2) rock sample that the obtains rock porosity that titration dilation angle and axle pressure value graph of a relation and step 1) obtain in loading procedure and titration dilation angle graph of a relation learn the situation of change of rock sample in loading procedure mesoporosity rate, thus draw the degree of the damaged of rock sample diverse location, realize the real-time measurement of rock sample damage in CYCLIC LOADING process.
2. the method for real-time measurement of rock sample damage in a kind of CYCLIC LOADING process according to claim 1, is characterized in that step 1) is made up of following steps:
1-1) measure indoor temperature by temperature and utilize air-conditioning to adjust the temperature to preference temperature, adopting hygrometer measuring chamber humidity simultaneously, regulate humidity at optimum range with air steamer and lime;
1-2) get screening rock sample to be measured some, polished in face to be titrated gently with whetstone, make it not observe obvious concavo-convex place, then surface debris is blown away in electricity consumption, and titration clicks each place, upper and lower end face of boring sample, and side is selected 3-4 points;
1-3) prepare the colored solutions do not reacted with rock sample, the rock sample handled well is put into titration apparatus and is fixed, in beaker, extract appropriate colored solutions with microlitre meter, after liquid level is reduced to zero in all capillary burettes, takes out rock sample section;
The survey radius template that 1-4) utilization prepares is positioned over rock section upper record titration radius and takes the penetratable shape of final titration formation with camera, show that the irregular figure of the process of dripping formation is respectively to radius from surveying radius template, the porosity measurement method that the porosity of section rock sample is conventional measures;
1-5) by the titration of many groups, and often group tests the difference all carrying out avoiding individual discrete type to cause on same rock sample as far as possible, the titration dilation angle size of statistics different porosities size rock sample, draw rock porosity and titration dilation angle graph of a relation, from figure, characterize the internal injury of rock.
3. the method for real-time measurement of rock sample damage in a kind of CYCLIC LOADING process according to claim 2, is characterized in that: step 1-4) in the porosity measurement method of routine that adopts be pycnometer method.
4. the method for real-time measurement of rock sample damage in a kind of CYCLIC LOADING process according to claim 1 and 2, is characterized in that step 2) be made up of following steps:
2-1) measure indoor temperature by temperature and utilize air-conditioning to adjust the temperature to preference temperature, adopting hygrometer measuring chamber humidity simultaneously, regulate humidity at optimum range with air steamer and lime;
2-2) choose rock sample, choose and drill through and the sandstone sample of polishing qualified, specimen size is diameter 50mm, height 100mm, and require sample end surface flatness deviation, height tolerance meets code requirement, and its porosity recorded between two difference is not more than 10%;
Titration 2-3) must be carried out in the side of rock to do late time data contrast before carrying out uniaxial compression: after with dry sanding paper wiping rock surface, blow away surface debris with hair-dryer, the rock processed is positioned on table, select the experiment measuring point (1,2,3) of rock side faces; 10ml solution is got with microlitre meter, the syringe needle of microlitre meter is contacted with rock surface, solution is slowly dripped to rock side faces, and solution to be titrated takes off rock sample after infiltrating rock completely, covers at rock side faces with survey radius template, be graphics shape is taken with camera, showing that the irregular figure of the process of dripping formation is respectively to radius from surveying radius template, calculating three experiment measuring points (1,2,3) titration dilation angle value under 0MPa, cleans up the colored solutions on rock sample surface;
Stop after 2-4) in experimental machine, control instrument is loaded on 20MPa from 0MPa loading, keep rock axially loaded constant, grind gently with dry sanding paper and wipe surface of test piece, surface debris is blown away with hair-dryer, get with microlitre meter solution 10 microlitre prepared and be slowly injected in step 2-3) in the experiment measuring point (1 of rock side faces chosen, 2, 3), solution to be injected finally infiltrates the titration of rock interior trailing flank to be completed, turn off rock compressed instrument take out rock sample and survey radius template is carefully covered rock side faces, and take be graphics shape with camera, show that the irregular figure of the process of dripping formation is respectively to radius from surveying radius template, calculate three experiment measuring points (1, 2, 3) titration dilation angle value under 20MPa, clean up the colored solutions on rock sample surface,
2-5) repeat step 2-4) obtain three experiment measuring point (1,2,3) titration dilation angle values under 40MPa, clean up the colored solutions on rock sample surface;
2-6) repeat step 2-4) obtain three experiment measuring point (1,2,3) titration dilation angle values under 60MPa;
2-7) according to step 2-4), 2-5), 2-6) different pressures under titration dilation angle value draw out rock sample titration dilation angle and axle pressure value graph of a relation in loading procedure.
5. the method for real-time measurement of rock sample damage in a kind of CYCLIC LOADING process according to claim 4, it is characterized in that: by the solution taken with camera rock sample surface be contrast with the grid of template after shape AUTO CAD software describes thus count the area S of be shape, recycling area formula obtains the mean radius r of titration, i.e. titration dilation angle.
CN201310480353.1A 2013-10-15 2013-10-15 Real-time measuring method for rock sample damage in circulation loading process CN103512816B (en)

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CN103884634B (en) * 2014-03-10 2015-12-30 三峡大学 A kind of stressed method of testing the stressed titration apparatus of tunnel rock and measuring rock
CN103940664A (en) * 2014-05-13 2014-07-23 中国矿业大学 Device and method for identifying hard soil fracture microstructure under triaxial test conditions
CN105424573A (en) * 2015-11-03 2016-03-23 三峡大学 Method for detecting tile porosity and pore distribution
CN106228558B (en) * 2016-07-26 2018-11-09 三峡大学 A method of layer being carried out into formula breakdown diagnosis to rock
CN108051540B (en) * 2017-11-30 2020-10-09 三峡大学 Rock damage in-situ measurement device and measurement method
CN108195996A (en) * 2018-01-16 2018-06-22 三峡大学 Semi-automatic titration outfit and test method
CN110793996B (en) * 2019-10-22 2020-11-03 中国科学院力学研究所 Method for representing CMCs damage induced by high temperature long time aging based on micropore increment

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