CN108732015A - Reflection rock length load lasts the test method of creep behaviour - Google Patents
Reflection rock length load lasts the test method of creep behaviour Download PDFInfo
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- CN108732015A CN108732015A CN201810569686.4A CN201810569686A CN108732015A CN 108732015 A CN108732015 A CN 108732015A CN 201810569686 A CN201810569686 A CN 201810569686A CN 108732015 A CN108732015 A CN 108732015A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0048—Hydraulic means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0071—Creep
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Abstract
The present invention relates to geotechnical engineering field more particularly to a kind of test methods of creep of rock behavior.The problem that the virtual condition etc. of requirement and laboratory test for engineering construction to the research time limit faces, the present invention proposes that a kind of reflection rock length load lasts the test method of creep behaviour, this method is using raising test temperature, the experimental test technology being combined with the injury recovery creep under the low stress after high stress loads creep by loading creep under high stress, the relationship for obtaining the creep time and rate under short duration respectively, realizes effective creep rate that the reflection practical creep state of engineering site is obtained using short-term creep test.
Description
Technical field
The present invention relates to geotechnical engineering field more particularly to a kind of test methods of creep of rock behavior.
Background technology
Deep subterranean body is typically among buried high temperature and high pressure environment, and high pressure stress field can cause rock mass that creep occurs
Deformation, temperature field can then lead to the acceleration of the deformation of creep, to be adversely affected to engineering construction and safe operation.It is special
It is not for the rock salt in the underground salt cave energy storage cavern of deep, since storage cavern buried depth is usually 1000 meters of underground hereinafter, even super
2000 meters are gone out.Temperature at 2000 meters is up to 86 DEG C, and stress is up to 50MPa.Creep of Salt deformation to temperature and stress extremely
Sensitivity, stress increases or temperature increases, and rock salt deformation can be caused to accelerate.By indoor creep test, reflection storage can be obtained
Library scene rock salt runs effective creep rate under the time limit for a long time in storage cavern, directly determines reasonability and the operation of engineering design
Economy.
By laboratory test, the relatively reliable creep rate that can reflect the practical creep state of engineering site is obtained, then is needed
To carry out load test time very long creep test indoors, such as the load time is not less than 2 years or even longer (such as 10
Year).The time for why needing load very long is because rock is under constant load effect, and the deformation of creep is to continue not
Disconnected development, the load test time is shorter, and the creep rate that laboratory obtains is higher, is differed with the practical creep rate of engineering site
It is bigger.With the salt cave storage cavern engineering for the high creep rate design that short duration creep obtains, the not only actually available time limit of engineering
Shorten, while the economic cost that engineering construction need to be put into is higher, and the operation economic benefit after building up is also poorer.
In fact, salt cave storage cavern engineering is completed from proposed to construction, the entire week including exploration, design and construction
Phase, typically 4~5 annual periods.Within the period of such section, the sample of proposed site is obtained, then completes the longer load time
Creep test after, creep test parameter that re-using experiment room obtains carries out engineering design and construction, with practical conditions on say
It is unworkable.
Carry out creep test, can be completed not being not an equipment, needs multiple devices to synchronize and carry out, and once
Load cannot then be shut down, this, which does not require nothing more than test equipment, need to sufficient amount, also require equipment in entire test process that cannot go out
Existing failure or test are interrupted, and test failure or the result measured otherwise can be caused insincere.On in real time, not only it is difficult to ensure and is used for
The equipment of test has more simultaneously, it is more difficult to ensure equipment in long-term test inevitably because various factors causes to occur testing to interrupt
The phenomenon that.Therefore, in order to avoid above-mentioned practical challenges, the creep that it is 7 days the load time that laboratory, which is usually carried out, longest creep
It rarely exceeds 1 month, measuring technology is also only that single sample only adds the single-stage load of level-one load or single sample gradually to increase
Add the multi-stage loading of loading stress.If opinion is single-stage load, the multi-stage loading of stress is still gradually increased, in so short creep
In test period, the result of acquisition necessarily high creep rate, inevitable is not effective creep rate.
To sum up, problem is：(1) engineering construction to research the time limit be distinctly claimed, leave for use for laboratory in obtain most
The time limit of termination fruit is extremely limited, even serious inadequate.(2) synchronism detection of multiple devices development simultaneously is needed, to number of devices
It is required that it is high, it is generally difficult to meet.(3) even if with multiple devices, during synchronous development experiment, there is event in any equipment
Barrier or test are interrupted, and test failure can be all caused.Again it tests, the research time limit can be seriously affected, and be difficult to the portion of guarantee not again
It goes wrong.(4) if it is long-term test, testing time durations are long, need to expend a large amount of man power and material, in real time upper hardly possible
To ensure.(5) environment temperature in long-term test process, humidity and loading stress is required to keep constant constant, to laboratory
Condition require high, short cycle or can maintain, be difficult to ensure under long-time reluctantly.(6) short-term creep results are serious
Deviate practical, to take load time difference, the creep rate of acquisition is different, and as a result not unique, even mistake can cause to mislead.
Invention content
The problem that the virtual condition etc. of requirement and laboratory test for engineering construction to the research time limit faces, the present invention
It is proposed that a kind of reflection rock length load lasts the test method of creep behaviour, this method is answered using test temperature is improved by height
The experimental test technology that creep is combined with the injury recovery creep under the low stress after high stress loads creep is loaded under power, point
Not Huo get under short duration the creep time and rate of (such as 7 days~10 days) relationship, realize and obtained using short-term creep test
It must reflect effective creep rate of the practical creep state of engineering site.
For a better understanding of the present invention, first the three axis rock mechanics test system that the present invention uses is briefly described.
Three axis rock mechanics test system mainly consists of the following parts：Loading frame and axis pressure control system, hydraulic pressure are dynamic
Power feed system, triaxial cell, confining pressure control system, pore pressure control system, ultrasonic measurement system, temperature control system,
Computer controls and data acquisition processing system.
A kind of reflection rock length load lasts the test method of creep behaviour, specially：
S1, rock test block 5 and seaming chuck 3 of the load on rock 5 to be tested and push-down head 7 are wrapped up into upper protective film together
4, the rock test block 5 for wrapping up upper protective film 4 is installed along with to the testing machine bottom of triaxial cell 1 with seaming chuck 3 and push-down head 7
On bearing base 8 on seat 9, adjustment seaming chuck 3 makes it be contacted with the load column 2 of triaxial cell 1, push-down head 7 and carrying
Pedestal 8 contacts, and triaxial cell 1 is connected with tester base 9；
S2, after filling confining pressure oil into triaxial cell 1 by confining pressure pressure channel 11, it is right by confining pressure pressure channel 11
Rock test block 5 in triaxial cell 1 applies hydrostatic pressure to target confining pressure；
S3, the outer wall of triaxial cell 1 is heated using heating ribbon heater 6, triaxial cell 1 transfers heat to confining pressure
Oil, then rock test block 5 is transferred heat to by confining pressure oil, so that rock test block 5 is reached predetermined temperature, the predetermined temperature is
100~150 DEG C；
S4, first order deviatoric stress is applied to rock test block 5 by loading column 2, the creep completed under predetermined time A is real
It tests, unloads the deviatoric stress applied to rock test block 5 so that the deviatoric stress value being applied in rock test block 5 is first order deviatoric stress
Value 10~25%, complete creep impairment in predetermined time A and restore experiment, wherein the first order deviatoric stress is equal to
16Mpa, the predetermined time A are executeaaafunction, and the predetermined time A is 3~5 days；
S5, second level deviatoric stress is applied to rock test block 5 by loading column 2, the creep completed under predetermined time B is real
It tests, unloads the deviatoric stress applied to rock test block 5 so that the deviatoric stress value being applied in rock test block 5 is second level deviatoric stress
Value 10~25%, complete creep impairment in predetermined time B and restore experiment, wherein the second level deviatoric stress is equal to
18Mpa, the predetermined time B are executeaaafunction, and the predetermined time B is 4~10 days.
Further, it is 100~120 DEG C that rock test block 5 described in S3, which reaches predetermined temperature,.
Further, it is 100 DEG C that rock test block 5 described in S3, which reaches predetermined temperature,.
Further, it after the first order deviatoric stress applied to rock test block 5 is unloaded described in S4, is applied in rock test block 5
The value of deviatoric stress be that the second level deviatoric stress that applies to rock test block 5 is unloaded described in 10~20%, S5 of first order deviatoric stress
Afterwards, the value for being applied to the deviatoric stress in rock test block 5 is the 10~20% of second level deviatoric stress.
Further, it after the first order deviatoric stress applied to rock test block 5 is unloaded described in S4, is applied in rock test block 5
The value of deviatoric stress be after unloading the second level deviatoric stress that applies to rock test block 5 described in 12.5%, S5 of first order deviatoric stress,
The value for being applied to the deviatoric stress in rock test block 5 is the 12.5% of second level deviatoric stress.
Further, second level deviatoric stress is more than first order deviatoric stress.
Further, second season deviatoric stress is bigger 2Mpa than first order deviatoric stress.
Further, predetermined time A described in S4 is 3 days.
Further, predetermined time B described in S5 is 4 days.
The beneficial effects of the invention are as follows：
The effective creep rate for obtaining the reflection practical creep state of engineering site using short-term creep test is realized, is overcome
Existing test must test the problem that could be realized by the creep loading of super-long-term；
The creep rate of acquisition is single value, overcomes existing measuring technology changeable shadow of value due to the load time influences
It rings；
Because the testing time is short, can avoid leading to test failure due to equipment is likely to occur accidental interruption because continuously running for a long time,
To influence the problem of research cycle；
Because the testing time is short, the entire environment that is more easy to ensure in test process and stress state it is constant；
The man power and material needed for research can be greatlyd save；
By the creep of higher stress after the creep impairment recovery after higher stress is combined, for determining that creep has jointly
The measuring technology for imitating creep rate, has filled up the blank of current creep test technology.
Description of the drawings
Fig. 1 is three axis rock mechanics test system structure schematic diagrames.
Fig. 2 is creep rate and creep time relationship under normal creep.
Fig. 3 is 100 DEG C of temperature, the load creep under confining pressure 20MPa and creep impairment recovery curve.
Wherein, the triaxial cells 1-；2- loads column；3- seaming chucks；4- protective films；5- rock test blocks；6- heats electric heating
Band；7- push-down heads；8- bearing bases；9- tester bases；10- measures control sensor lead hole；11- confining pressure pressure channels；
12- alignment pin mounting holes；13- alignment pins.
Specific implementation mode
The present invention will be described below in conjunction with the accompanying drawings.
As shown in Fig. 2, creep rate and time relationship in the case where temperature is 45 DEG C, confining pressure 20MPa, axis pressure are 36MPa
Schematic diagram.In figure 7 days rates be 1.29 times of 10 days, 2.66 times of 20 days, 4.12 times of 30 days, 10.17 times of 60 days；30 days
Rate is 2.47 times of 60 days, 3.77 times of 90 days, 4.9 times of 200 days, 5.8 times of 363 days.As can be seen that creep rate with
Time increase continuously decreases, and creep rate of the time after 200 days just gradually tends to be relatively stable, and creep rate is at any time
Extension still has slow downward trend, and 300 days creeps rate are 1.27 × 10-3, 510 days creeps rate are about 1.24 × 10-3。
It is tested, specifically to a rock test block at 100 DEG C of temperature, confining pressure 20MPa using system as described in Figure 1
Steps are as follows：
S1, rock test block 5 and seaming chuck 3 of the load on rock 5 to be tested and push-down head 7 are wrapped up into upper protective film together
4, the rock test block 5 for wrapping up upper protective film 4 is installed along with to the testing machine bottom of triaxial cell 1 with seaming chuck 3 and push-down head 7
On bearing base 8 on seat 9, adjustment seaming chuck 3 makes it be contacted with the load column 2 of triaxial cell 1, push-down head 7 and carrying
Pedestal 8 contacts, and triaxial cell 1 is connected with tester base 9；
S2, after filling confining pressure oil into triaxial cell 1 by confining pressure pressure channel 11, it is right by confining pressure pressure channel 11
Rock test block 5 in triaxial cell 1 applies hydrostatic pressure to target confining pressure；
S3, the outer wall of triaxial cell 1 is heated using heating ribbon heater 6, triaxial cell 1 transfers heat to confining pressure
Oil, then rock test block 5 is transferred heat to by confining pressure oil, so that rock test block 5 is reached 100 DEG C；
S4, first order deviatoric stress 16Mpa is applied to rock test block 5 by loading column 2, completed compacted under predetermined time A
Become experiment, unload the deviatoric stress 14Mpa applied to rock test block 5, is completed in the case where deviatoric stress value is 2MPa in pre- timing
Between creep impairment in A restore experiment wherein, the predetermined time A is executeaaafunction, and the predetermined time A is 3 days；
S5, second level deviatoric stress 18Mpa is applied to rock test block 5 by loading column 2, completed compacted under predetermined time B
Become experiment, unload the deviatoric stress 16Mpa applied to rock test block 5, is completed in the case where deviatoric stress value is 2Mpa in pre- timing
Between creep impairment in B restore experiment wherein, the predetermined time B is executeaaafunction, and the predetermined time B is 4 days.
It loads creep and creep impairment recovery curve is as shown in Figure 3.Wherein, it is 1. axial stress 36MPa (i.e. deviatoric stress
Creep rate under 16MPa), 2. for creep under axial stress 36MPa after, axial stress be 34MPa (i.e. deviatoric stress 14MPa)
It is lower carry out creep restore under creep rate, be 3. the creep rate under axial stress 38MPa (i.e. deviatoric stress 18MPa), 4. for
Under axial stress 38MPa after creep, the creep under creep restores is carried out in the case where axial stress is 36MPa (i.e. deviatoric stress 16MPa)
Rate.The increment of above-mentioned unloading stress is 2MPa, is the 12.5% of deviatoric stress 16MPa.
For the rate of deformation 1., 2., 3., under 4. four-stage creep and creep impairment restore that test in Fig. 3 obtains,
Creep rate & ,s &=[(1. × 20%)+(2. × 35%)+(3. × 10%)+(4. × 35%)] is calculated as follows.
The average steady state creep rate tested in Fig. 3 1., 2., 3., 4. is respectively 1.31 × 10-3、8.75×10-4、2.79
×10-3、1.24×10-3, it is accordingly 1.28 × 10 by the steady state creep strain rate that above-mentioned formula is calculated-4.And from 210 days in Fig. 2
Average steady state creep rate after beginning is 1.27 × 10-3, two results are consistent.
From the above results, under identical confining pressure and deviatoric stress, under normal temperature and normal creep (such as Fig. 2), reach steady
State creep needs for a long time；And scheme (such as Fig. 3) using the present invention, shortening creep time can be reached, and obtain effective compacted
Become result.
Claims (8)
1. a kind of reflection rock length load lasts the test method of creep behaviour, which is characterized in that be as follows：
S1, rock test block 5 and seaming chuck 3 of the load on rock 5 to be tested and push-down head 7 wrap ups into upper protective film 4 together, general
The rock test block 5 for wrapping up upper protective film 4 is installed along with the tester base 9 of triaxial cell 1 with seaming chuck 3 and push-down head 7
On bearing base 8 on, adjustment seaming chuck 3 so that it is contacted with the load column 2 of triaxial cell 1, push-down head 7 and bearing base
8 contacts, triaxial cell 1 is connected with tester base 9；
S2, after filling confining pressure oil into triaxial cell 1 by confining pressure pressure channel 11, by confining pressure pressure channel 11 to installation
Rock test block 5 in triaxial cell 1 applies hydrostatic pressure to target confining pressure；
S3, the outer wall of triaxial cell 1 being heated using heating ribbon heater 6, triaxial cell 1 transfers heat to confining pressure oil,
Rock test block 5 is transferred heat to by confining pressure oil again, rock test block 5 is made to reach predetermined temperature, the predetermined temperature is 100~
150℃；
S4, first order deviatoric stress is applied to rock test block 5 by loading column 2, completes the creep test under predetermined time A, unloads
Carry the deviatoric stress applied to rock test block 5 so that the deviatoric stress value being applied in rock test block 5 is the value of first order deviatoric stress
10~25%, the creep impairment completed in predetermined time A restores experiment, wherein and the first order deviatoric stress is equal to 16Mpa,
The predetermined time A is executeaaafunction, and the predetermined time A is 3~5 days；
S5, second level deviatoric stress is applied to rock test block 5 by loading column 2, completes the creep test under predetermined time B, unloads
Carry the deviatoric stress applied to rock test block 5 so that the deviatoric stress value being applied in rock test block 5 is the value of second level deviatoric stress
10~25%, the creep impairment completed in predetermined time B restores experiment, wherein and the second level deviatoric stress is equal to 18Mpa,
The predetermined time B is executeaaafunction, and the predetermined time B is 4~10 days.
2. a kind of reflection rock length load lasts the test method of creep behaviour according to claim 1, it is characterised in that：S3
It is 100~120 DEG C that the rock test block 5, which reaches predetermined temperature,.
3. a kind of reflection rock length load lasts the test method of creep behaviour according to claim 2, it is characterised in that：S3
It is 100 DEG C that the rock test block 5, which reaches predetermined temperature,.
4. a kind of reflection rock length load lasts the test method of creep behaviour according to claim 1, it is characterised in that：S4
After the first order deviatoric stress that the unloading applies rock test block 5, the value for being applied to the deviatoric stress in rock test block 5 is the first order
After unloading the second level deviatoric stress applied to rock test block 5 described in 10~20%, S5 of deviatoric stress, it is applied in rock test block 5
Deviatoric stress value be second level deviatoric stress 10~20%.
5. a kind of reflection rock length load lasts the test method of creep behaviour according to claim 4, it is characterised in that：S4
After the first order deviatoric stress that the unloading applies rock test block 5, the value for being applied to the deviatoric stress in rock test block 5 is the first order
After unloading the second level deviatoric stress applied to rock test block 5 described in 12.5%, S5 of deviatoric stress, it is applied in rock test block 5
The value of deviatoric stress is the 12.5% of second level deviatoric stress.
6. according to a kind of test method for reflecting rock length load and lasting creep behaviour of claim Isosorbide-5-Nitrae or 5, feature exists
In：Second level deviatoric stress is more than first order deviatoric stress.
7. a kind of reflection rock length load lasts the test method of creep behaviour according to claim 6, it is characterised in that：The
Two season deviatoric stress it is bigger 2Mpa than first order deviatoric stress.
8. a kind of reflection rock length load lasts the test method of creep behaviour according to claim 1, it is characterised in that：S4
The predetermined time A is 3 days, and predetermined time B described in S5 is 4 days.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109540673A (en) * | 2018-12-12 | 2019-03-29 | 东北大学 | A kind of test method loading equivalent hard rock creep based on low-cycle fatigue |
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| 陈锋;李银平;杨春和;张超;: "云应盐矿盐岩蠕变特性试验研究", 岩石力学与工程学报, no. 1 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109540673A (en) * | 2018-12-12 | 2019-03-29 | 东北大学 | A kind of test method loading equivalent hard rock creep based on low-cycle fatigue |
| CN109540673B (en) * | 2018-12-12 | 2021-04-02 | 东北大学 | Low-cycle fatigue loading equivalent hard rock creep test method |
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