CN109406019A - A kind of detecting earth stress method and device for reappearing velocity of wave - Google Patents
A kind of detecting earth stress method and device for reappearing velocity of wave Download PDFInfo
- Publication number
- CN109406019A CN109406019A CN201811367114.4A CN201811367114A CN109406019A CN 109406019 A CN109406019 A CN 109406019A CN 201811367114 A CN201811367114 A CN 201811367114A CN 109406019 A CN109406019 A CN 109406019A
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- wave
- test
- stress
- velocity
- sound wave
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- 238000000034 method Methods 0.000 title claims abstract description 21
- 239000011435 rock Substances 0.000 claims abstract description 36
- 238000011065 in-situ storage Methods 0.000 claims abstract description 16
- 238000012669 compression test Methods 0.000 claims abstract description 10
- 230000005540 biological transmission Effects 0.000 claims description 22
- 230000006835 compression Effects 0.000 claims description 4
- 238000007906 compression Methods 0.000 claims description 4
- 230000001360 synchronised effect Effects 0.000 claims description 3
- 238000005553 drilling Methods 0.000 abstract description 6
- 230000007547 defect Effects 0.000 abstract description 3
- 230000000875 corresponding effect Effects 0.000 description 7
- 238000011068 loading method Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/25—Measuring force or stress, in general using wave or particle radiation, e.g. X-rays, microwaves, neutrons
- G01L1/255—Measuring force or stress, in general using wave or particle radiation, e.g. X-rays, microwaves, neutrons using acoustic waves, or acoustic emission
Abstract
The invention discloses a kind of detecting earth stress method and devices for reappearing velocity of wave, three-dimensional Rock Velocity is tested and calculated under in-situ stress state on the wall of a borehole, the rock sample of orientation will be fetched from protolith again, process maximum sound wave direction, that is the rock sample of direction of maximal stress carries out compression test and sonic test under side pressure.The maximum stress that the test specimen velocity of wave pressure equal with the maximum velocity of wave that drills is drilling protolith is chosen, maximum sound wave direction is protolith direction of maximal stress.Present invention utilizes Rock Velocity and crustal stress positive correlation, and crustal stress act on lower velocity of wave variable quantity generally 5%~20% advantage, ensure that the measuring accuracy of crustal stress, while having filled up the defect of Acoustic Emission of Rock detecting earth stress method.Test philosophy of the present invention is concise, and equipment is light, and the measuring accuracy of crustal stress can be improved from magnitude.
Description
Technical field
The invention belongs to technical field of geophysical exploration, relate in particular to a kind of detecting earth stress side for reappearing velocity of wave
Method and device.
Background technique
Existing Acoustic Emission of Rock (kaiser effect) detecting earth stress, is the rock sample that orientation is fetched from protolith,
Carry out Experimental on acoustic emission by the rock samples of the different directions to processing, measure kaiser point, can find out each test specimen with
The preceding maximum pressure being once subject to, and as current stress.But protolith in the multiple structure Historical Evolution on stratum by more
Secondary extruding, the maximum pressure that kaiser effect obtains not necessarily are exactly current pressure, and maximum pressure direction once is also not necessarily
It is exactly current stress direction.Strain restoring method is also a kind of test method of crustal stress, and principle is core from surrounding rock body
After separation i.e. occur volume restore (a part be occur immediately elasticity recovery, another part be slowly occur at any time it is stagnant
Elasticity is restored), and the strain amount of recovery of all directions is positively correlated with pressure before.Strain restoring method, which is possible to obtain protolith, to be worked as
Preceding stress, but it belongs to the indirect method of measurement, the processing that elasticity is restored calculates, the measurement that anelasticity is restored and processing calculate
It is a sufficiently complex process, needs to establish accurate constitutive model, and the strain that anelasticity is restored for different lithology
Amount generally 0.01%~0.3%, measurement is not easy, and constitutive model foundation is not easy, and the Fitting Calculation is not easy.
Summary of the invention
The technical problem to be solved by the present invention is providing a kind of detecting earth stress method and device for reappearing velocity of wave, test
Principle is concise, and equipment is light, and the measuring accuracy of crustal stress can be improved from magnitude.
Technical scheme is as follows:
A kind of detecting earth stress device reappearing velocity of wave, including sonic sensor, sound wave rigidity power transmission box, bearing plate and side
To pressure plate；
The sonic sensor is respectively placed in the upper and lower end of test block；
The sound wave rigidity power transmission box is connected with bearing plate, places test block between two sound wave rigidity power transmission boxes；
The lateral pressure piece is placed in test block side.
A kind of detecting earth stress method for reappearing velocity of wave, comprising the following steps:
Step 1 prepares test block: drill coring in situ, using the original-party of drill core direction restoring method calibration core sample
Position；In-situ three-dimensional sonic test is carried out at the hole wall in situ of coring point, calculates three dimensional sound wave number and direction；It is surveyed with three-dimensional acoustic wave
The maximum sound wave value direction of examination becomes cuboid test block as axial, the equal processing coring rock core in two sides；
Step 2, test block load compression and classification sonic test: test block is placed at sound wave rigidity power transmission box, sound wave rigidity
Sonic sensor is installed, lateral pressure piece is installed in test block side, by bearing plate and sound wave rigidity power transmission box to examination in power transmission box
Block carries out the rock trixlal compression test for having lateral pressure, sonic test is carried out with time stage, when axially loaded pressure pair
When the classification velocity of wave answered is equal to maximum sound wave value, repressurization or grade terminate to test；
Step 3 determines maximum crustal stress and maximum stress direction: choosing test block sonic test value and original position is most loud
The equal corresponding pressure value of wave number is that maximally stress value, maximum sound wave value direction are maximum stress direction.
Wherein, in the step 2, firstly, in the way of rock trixlal compression test, using 2MPa as predetermined lateral
Pressure carries out lateral pressure load synchronous with axial compressive force；Calculate the average velocity of wave V of lateral bidimensional0, using 2MPa as arithmetic series
It is axially and laterally loaded, carries out sound wave and load test step by step, when the corresponding classification velocity of wave of on-load pressure is equal to V0When, with
On-load pressure value at this time is set as side pressure value, and side pressure value is fixed and no longer changed.
Present invention employs Rock Velocity and the positively related correspondence principle of rock crustal stress, using being surveyed under in-situ stress state
Examination and the three-dimensional velocity of wave for calculating rock, the rock sample in maximum sound wave direction is processed directly in the core fetched, is there is confining pressure
Compression test and sonic test are carried out to rock sample under the premise of lower.It is equal with the maximum velocity of wave that drills finally to choose test specimen velocity of wave
Pressure, for drill protolith maximum stress, maximum sound wave direction be protolith direction of maximal stress.This invention removes rock sound
The defect of transmitting test crustal stress, clearly determines current protolith maximum stress, rather than the historical maximum stress of protolith,
The heavy link that the rock sample of Acoustic Emission of Rock requirement multiple directions is tested is eliminated simultaneously, is avoided since rock tries
Part sample is insufficient and the case where influence test and statistical accuracy.
Detailed description of the invention
Fig. 1 is present invention drilling schematic diagram；
Fig. 2 is the pressure-loaded compression test schematic diagram that the present invention has side pressure；
In figure, the original position 1- hole wall, 2- maximum sound wave value, 3- three dimensional sound wave number, 4- test block, 5- sonic sensor, 6- sound wave
Rigid power transmission box, 7- bearing plate, 8- lateral pressure piece.
Specific embodiment
In the following, the present invention is further detailed in conjunction with attached drawing.
The present invention is to test and calculate three-dimensional Rock Velocity under in-situ stress state on the wall of a borehole, then will be from protolith
The rock sample of orientation is fetched, maximum sound wave direction, the i.e. rock sample of direction of maximal stress is processed, carries out the compression under side pressure
Test and sonic test.The maximum stress that 4 velocity of wave of the test block pressure equal with the maximum velocity of wave that drills is drilling protolith is chosen, it is maximum
Sound wave direction is protolith direction of maximal stress.Present invention utilizes Rock Velocities and crustal stress positive correlation, and crustal stress is made
With lower velocity of wave variable quantity generally 5%~20% advantage, ensure that the measuring accuracy of crustal stress, while having filled up rock
The defect of sound emission detecting earth stress method.
As depicted in figs. 1 and 2, a kind of detecting earth stress device reappearing velocity of wave, including sonic sensor 5, sound wave rigidity
Power transmission box 6, bearing plate 7 and lateral pressure piece 8；Sonic sensor 5 is respectively placed in the upper and lower end of test block 4；Sound wave rigidity power transmission box
6 are connected with bearing plate 7, and test block 4 is placed between two sound wave rigidity power transmission boxes 6；Lateral pressure piece 8 is placed in 4 side of test block.
Wherein, lateral pressure piece 8, which is to provide, applies stressed device to 4 peripheral surface of test block, such as pastes with specimen surface
The combination of the steel plate and horizontal air cylinder of conjunction, or any existing energy provide the device of lateral on-load pressure.Sound wave rigidity power transmission box 6
It is the container of embedded sonic sensor 5, which is rigid container, can be conducted in the case where hardly deformation or small deformation
Pressure.Sonic sensor 5 is mounted in sound wave rigidity power transmission box 6, mobile with sound wave rigidity power transmission box 6.Bearing plate 7 is press machine
Force transferring structure.
A kind of detecting earth stress method for reappearing velocity of wave, comprising the following steps:
Step 1 prepares test block 4: drill coring in situ, using the original-party of drill core direction restoring method calibration core sample
Position；In-situ three-dimensional sonic test is carried out at the hole wall in situ 1 of coring point, calculates three dimensional sound wave number 3 and direction (can be simple
It is interpreted as boring a hole in rock mass, after the rubble in hole is taken out, carries out three-dimensional acoustic wave on the hole wall of the hole coring position
Test)；(four sides of axis are parallel to using maximum 2 direction of sound wave value that three-dimensional acoustic wave is tested as axial, two sides are equal
Face is equal) processing coring rock core, become cuboid test block 4；
Step 2, the load of test block 4 compression and classification sonic test: test block 4 is placed at sound wave rigidity power transmission box 6, sound wave
Sonic sensor 5 is installed, lateral pressure piece 8 is installed in 4 side of test block, rigidly passes by bearing plate 7 and sound wave in rigid power transmission box 6
Power box 6 carries out the rock trixlal compression test for having lateral pressure to test block 4, carries out sonic test with time stage, works as axial direction
When the corresponding classification velocity of wave of on-load pressure is equal to maximum sound wave value 2, repressurization 2 or 3 grades terminate to test；
It should be noted that in step 2, firstly, in the way of rock trixlal compression test, using 2MPa as predetermined side
Carry out that lateral pressure and axial compressive force (corresponding pressure arbor to) are synchronous to be loaded to pressure；Calculate the average velocity of wave of lateral bidimensional
V0, axially and laterally loaded using 2MPa as arithmetic series, sound wave and load test carried out step by step, when on-load pressure is corresponding
It is classified velocity of wave and is equal to V0When, side pressure value is set as with on-load pressure value at this time, side pressure value is fixed and no longer changed；
Step 3 determines maximum crustal stress and maximum stress direction: choosing 4 sonic test value of test block and original position is most loud
The equal corresponding pressure value of wave number 2 is that maximally stress value, maximum sound wave value direction are maximum stress direction.
In above-mentioned test method, there are several concepts to need to illustrate:
It is in situ: rock body drilled coring position；
Core in coring refers to the rock core taken out in drilling；
Reference azimuth refers to orientation of the core sample in former drilling, how to determine and can refer to a kind of entitled " drill core
The Chinese invention patent of direction recovery method " (notification number CN103670382B, day for announcing 2016-07-13)；
Classification carries out sonic test, refers to using rock trixlal compression test mode, axially loaded using continuous
Loading Method applies xial feed with the loading velocity of 0.5MPa per second, 2MPa or so be level-one carry out step by step sonic test with
Read xial feed in side；
V0The average value for referring to the sum of other bidimensional velocity of wave, does not refer to the loading velocity of lateral tabletting；
In maximum sound wave value direction, processing coring becomes test block, refers in the core sample of coring in situ that drills, i.e., in situ
It is tested at hole wall 1 by three-dimensional acoustic wave, obtains the direction of maximum sound wave value, then former by the reference azimuth drilling of calibration core sample
The direction of maximum sound wave value is marked on the core sample of position coring；
On-load pressure in when the corresponding classification velocity of wave of on-load pressure is equal to maximum sound wave value 2 refers to press machine power transmission pier
Pressure (i.e. axial compressive force).
Claims (3)
1. a kind of detecting earth stress device for reappearing velocity of wave, it is characterised in that: including sonic sensor (5), sound wave rigidity power transmission
Box (6), bearing plate (7) and lateral pressure piece (8)；
The sonic sensor (5) is respectively placed in the upper and lower end of test block (4)；
The sound wave rigidity power transmission box (6) is connected with bearing plate (7), and examination is placed between two sound wave rigidity power transmission boxes (6)
Block (4)；
The lateral pressure piece (8) is placed in test block (4) side.
2. a kind of detecting earth stress method for reappearing velocity of wave, which comprises the following steps:
Step 1 is prepared test block (4): drill coring in situ, using the reference azimuth of drill core direction restoring method calibration core sample；
In-situ three-dimensional sonic test is carried out at the hole wall in situ (1) of coring point, calculates three dimensional sound wave number (3) and direction；With three dimensional sound
Maximum sound wave value (2) direction of wave test becomes cuboid test block (4) as axial, the equal processing coring rock core in two sides；
Step 2, test block (4) load compression and classification sonic test: test block (4) is placed at sound wave rigidity power transmission box (6), sound
Sonic sensor (5) are installed in wave rigidity power transmission box (6), lateral pressure piece (8) are installed in test block (4) side, pass through bearing plate (7)
And sound wave rigidity power transmission box (6) carries out the rock trixlal compression test for having lateral pressure to test block (4), carries out with time stage
Sonic test, when the corresponding classification velocity of wave of axially loaded pressure is equal to maximum sound wave value (2), repressurization 2 or 3 grades terminate to try
It tests；
Step 3 determines maximum crustal stress and maximum stress direction: choosing test block (4) sonic test value and maximum sound wave in situ
Being worth (2) equal corresponding pressure value is that maximally stress value, maximum sound wave value direction are maximum stress direction.
3. a kind of detecting earth stress method for reappearing velocity of wave according to claim 2, it is characterised in that: the step 2
In, firstly, carrying out lateral pressure and axial pressure by predetermined lateral pressure of 2MPa in the way of rock trixlal compression test
The synchronous load of power；Calculate the average velocity of wave V of lateral bidimensional0, axially and laterally loaded using 2MPa as arithmetic series, step by step into
Row sound wave and load test, when the corresponding classification velocity of wave of on-load pressure is equal to V0When, side is set as with on-load pressure value at this time
Pressure value, side pressure value are fixed and are no longer changed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811367114.4A CN109406019A (en) | 2018-11-16 | 2018-11-16 | A kind of detecting earth stress method and device for reappearing velocity of wave |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811367114.4A CN109406019A (en) | 2018-11-16 | 2018-11-16 | A kind of detecting earth stress method and device for reappearing velocity of wave |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109406019A true CN109406019A (en) | 2019-03-01 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811367114.4A Withdrawn CN109406019A (en) | 2018-11-16 | 2018-11-16 | A kind of detecting earth stress method and device for reappearing velocity of wave |
Country Status (1)
| Country | Link |
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| CN (1) | CN109406019A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110794038A (en) * | 2019-10-26 | 2020-02-14 | 西南石油大学 | Rock ventricle inner orientation method based on acoustic wave velocity anisotropy |
-
2018
- 2018-11-16 CN CN201811367114.4A patent/CN109406019A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110794038A (en) * | 2019-10-26 | 2020-02-14 | 西南石油大学 | Rock ventricle inner orientation method based on acoustic wave velocity anisotropy |
| CN110794038B (en) * | 2019-10-26 | 2021-03-19 | 西南石油大学 | Rock ventricle inner orientation method based on acoustic wave velocity anisotropy |
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| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20190301 |
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| WW01 | Invention patent application withdrawn after publication |