CN209197943U - A kind of detecting earth stress device reappearing velocity of wave - Google Patents
A kind of detecting earth stress device reappearing velocity of wave Download PDFInfo
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- CN209197943U CN209197943U CN201821892326.XU CN201821892326U CN209197943U CN 209197943 U CN209197943 U CN 209197943U CN 201821892326 U CN201821892326 U CN 201821892326U CN 209197943 U CN209197943 U CN 209197943U
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Abstract
The utility model discloses a kind of detecting earth stress devices for reappearing velocity of wave, 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), places test block (4) between two sound wave rigidity power transmission boxes (6)；The lateral pressure piece (8) is placed in test block (4) side.The utility model is utilized 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.The utility model test philosophy is concise, and equipment is light, and the measuring accuracy of crustal stress can be improved from magnitude.
Description
Technical field
The utility model belongs to technical field of geophysical exploration, relates in particular to a kind of crustal stress survey for reappearing velocity of wave
Trial assembly is set.
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
Technical problem to be solved by the utility model is: providing a kind of detecting earth stress device for reappearing velocity of wave, test is former
Reason is concise, and equipment is light, and the measuring accuracy of crustal stress can be improved from magnitude.
The technical solution of the utility model 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.
The sonic sensor is placed in sound wave rigidity power transmission box.
The sound wave rigidity power transmission box is channel steel, and two one group of the sonic sensor is respectively placed in the bottom surface of channel steel.
The utility model uses Rock Velocity and the positively related correspondence principle of rock crustal stress, utilizes in-situ stress state
Lower test 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 being had
Compression test and sonic test are carried out to rock sample under the premise of under confining pressure.Finally choose test specimen velocity of wave and the maximum velocity of wave that drills
Equal pressure, for the maximum stress for the protolith that drills, maximum sound wave direction is protolith direction of maximal stress.The utility model is eliminated
The defect of Acoustic Emission of Rock test crustal stress, clearly determines current protolith maximum stress, rather than protolith is historical
Maximum stress, while the heavy link that the rock sample for eliminating Acoustic Emission of Rock requirement multiple directions is tested, avoid
The case where test and statistical accuracy are influenced due to rock sample sample deficiency.
Detailed description of the invention
Fig. 1 is the utility model drilling schematic diagram；
Fig. 2 is the pressure-loaded compression test schematic diagram that the utility model 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 utility model is further detailed in conjunction with attached drawing.
The utility model is to test and calculate three-dimensional Rock Velocity under in-situ stress state on the wall of a borehole, then will be from original
The rock sample of orientation is fetched in rock, is processed maximum sound wave direction, the i.e. rock sample of direction of maximal stress, is carried out under side pressure
Compression 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,
Maximum sound wave direction is protolith direction of maximal stress.Rock Velocity and crustal stress positive correlation is utilized in the utility model, and
Crustal stress act on lower velocity of wave variable quantity generally 5%~20% advantage, ensure that the measuring accuracy of crustal stress, fill out simultaneously
The defect of Acoustic Emission of Rock detecting earth stress method is mended.
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 to 4 peripheral surface of test block, applies stressed device, for example, with steel plate and horizontal
The combination of cylinder, or any existing lateral loading device.Sound wave rigidity power transmission box 6 is the container of embedded sonic sensor 5, should
Container is rigid container, can be in hardly deformation or conducting pressure in the case where small deformation.Sonic sensor 5 is mounted on sound wave
It is mobile with sound wave rigidity power transmission box 6 in rigidity power transmission box 6.Bearing plate 7 is the force transferring structure of press machine.
Reappear the detecting earth stress method of 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)；Using maximum 2 direction of sound wave value that three-dimensional acoustic wave is tested as axial, the equal processing coring rock core in two sides, become rectangular
Body 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.
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 device for reappearing velocity of wave according to claim 1, it is characterised in that: the sound wave sensing
Device (5) is placed in sound wave rigidity power transmission box (6).
3. a kind of detecting earth stress device for reappearing velocity of wave according to claim 2, it is characterised in that: the sound wave rigidity
Power transmission box (6) is channel steel, and (5) two one group of the sonic sensor is respectively placed in the bottom surface of channel steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821892326.XU CN209197943U (en) | 2018-11-16 | 2018-11-16 | A kind of detecting earth stress device reappearing velocity of wave |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821892326.XU CN209197943U (en) | 2018-11-16 | 2018-11-16 | A kind of detecting earth stress device reappearing velocity of wave |
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| Publication Number | Publication Date |
|---|---|
| CN209197943U true CN209197943U (en) | 2019-08-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201821892326.XU Active CN209197943U (en) | 2018-11-16 | 2018-11-16 | A kind of detecting earth stress device reappearing velocity of wave |
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2018
- 2018-11-16 CN CN201821892326.XU patent/CN209197943U/en active Active
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