CN111413730A - Earth crust drilling volume type strain gauge - Google Patents
Earth crust drilling volume type strain gauge Download PDFInfo
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- CN111413730A CN111413730A CN202010383586.XA CN202010383586A CN111413730A CN 111413730 A CN111413730 A CN 111413730A CN 202010383586 A CN202010383586 A CN 202010383586A CN 111413730 A CN111413730 A CN 111413730A
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- mems pressure
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- 238000005553 drilling Methods 0.000 title claims description 13
- 238000005192 partition Methods 0.000 claims abstract description 24
- 239000002184 metal Substances 0.000 claims abstract description 10
- 238000009413 insulation Methods 0.000 claims abstract description 4
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 13
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 11
- 229910052710 silicon Inorganic materials 0.000 claims description 11
- 239000010703 silicon Substances 0.000 claims description 11
- 239000003921 oil Substances 0.000 claims description 10
- 229920002545 silicone oil Polymers 0.000 claims description 9
- 229910052786 argon Inorganic materials 0.000 claims description 6
- 239000011148 porous material Substances 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 2
- 238000009434 installation Methods 0.000 abstract description 4
- 238000012423 maintenance Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 abstract description 2
- 238000005259 measurement Methods 0.000 description 8
- 239000012212 insulator Substances 0.000 description 6
- 239000007788 liquid Substances 0.000 description 6
- 239000000523 sample Substances 0.000 description 6
- 239000011435 rock Substances 0.000 description 5
- 239000004568 cement Substances 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000010292 electrical insulation Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000007596 consolidation process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000002243 precursor Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
- G01V1/16—Receiving elements for seismic signals; Arrangements or adaptations of receiving elements
- G01V1/18—Receiving elements, e.g. seismometer, geophone or torque detectors, for localised single point measurements
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B13/00—Measuring arrangements characterised by the use of fluids
- G01B13/24—Measuring arrangements characterised by the use of fluids for measuring the deformation in a solid
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Remote Sensing (AREA)
- Life Sciences & Earth Sciences (AREA)
- Acoustics & Sound (AREA)
- Environmental & Geological Engineering (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geophysics (AREA)
- Pressure Sensors (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
The invention discloses a ground shell borehole volume type strain gauge which is arranged in an underground borehole, wherein more than two MEMS pressure sensors (12) are arranged in a sensing cavity (7), and the MEMS pressure sensors (12) are fixed on the lower surface of a metal column core (8) or a partition plate (11); the measuring cavity (5) is provided with an independent top cavity (13) at the top, a circuit module (14) is arranged in the top cavity (13), a connecting line of the MEMS pressure sensor (12) penetrates through the partition plate (11) and is connected with the circuit module (14) in an insulation mode with a top plate (16) of the measuring cavity (5), and the circuit module (14) is connected with a ground electronic circuit through an external cable (15). The pressure sensor adopts the MEMS digital chip, has high precision and low power consumption, effectively solves the technical problem of the conduction of the upper cavity and the lower cavity after the diaphragm is broken in the traditional process, prolongs the service life of the strain gauge, does not need frequent maintenance, saves the labor cost, and has small volume and simple installation.
Description
Technical Field
The invention relates to the technical field of mechanical and electronic measurement structures, in particular to a ground shell drilling volume type strain gauge applied to the field of borehole body strain observation such as earthquake precursor strain observation, mine and other engineering measurement.
Background
At present, a probe of a crustal drilling strain observation instrument is generally placed in bedrock of a crustal with a depth of tens of meters in a drill hole, and the strain change of the surface layer of the crustal is observed. The observation object includes: and (4) bulk strain. The observation principle of the volume type strain gauge for drilling the crust is as follows: when the deformable container containing the incompressible liquid is subjected to a change in pressure, the level of the liquid at the upward outlet changes accordingly. At present, a body strain observation instrument used for a borehole strain observation platform network.
As shown in fig. 1, the conventional earth crust drilling volume type strain gauge structurally comprises an oblong cylinder, a partition plate is arranged in the middle of the oblong cylinder to divide the upper chamber into a measuring chamber 5 and a sensing chamber 7, a metal column core 8 is arranged in the sensing chamber 7, silicone oil 9 is filled in the sensing chamber 7, and a pressure sensor 3 and an electromagnetic valve 4 are arranged in the measuring chamber and filled with the silicone oil 9 and argon 2. The pressure sensor 3 and the electromagnetic valve 4 are connected with an external cable, and the external cable extends out through the end cap 1 to be connected with a ground electronic circuit. The pressure P of the measuring chamber 5 is measured due to the presence of argon 20Substantially constant, but with the sensing chamber 7, the pressure P of the silicone oil 9 being such that the volume of the chamber varies slightly as a result of the external force1I.e. a significant change will occur. The pressure sensor 3 is used for sensing the difference between the pressures of the measuring chamber 5 and the sensing chamber 7, namely P1-P0But actually P0Is substantially unchanged (P is produced already0Set to one atmosphere, i.e., about 0.1MPa), the information reflected by the pressure sensor 3 is only the pressure change of the sensing chamber 7. The electrical output e of the pressure sensor 3 is proportional to the volumetric strain Δ V1/V1 of the long cylinder. Two pressure sensors 3 are typically employed, with the intention that one is damaged and the other activated.
The solenoid valve 4, which can be opened when it is energized, communicates the measurement chamber 5 with the sensing chamber 7, the pressure difference between the two chambers becomes zero, P1＝P0And due to P0Is a constant standard pressure (one atmosphere), so that the pressure of the silicon oil 9 in the sensing cavity 7 can be restored to the original standard pressure when the electromagnetic valve 4 is opened. When the solenoid valve 4 is opened, the silicone oil 9 in a liquid state may be in a small amount (e.g., 0.003 cm)3Magnitude) for only about 0.2s, so that the solenoid valve 4 is closed (de-energized) for the majority of the time.
When the body strain of the bedrock of the crust of the earth changes to 6 × 10-6In the magnitude range, the ground electronic circuit can automatically open the electromagnetic valve 4 once to restore the working point of the pressure sensor 3 to the zero position (P)1≈P0The zero output of the electronic circuit is close to 0V).
The working principle is as follows: the structure is that an oblong elastic cylinder is filled with silicon oil, when the elastic cylinder is extruded or stretched by surrounding rocks, the pressure of the silicon oil liquid in the cylinder is changed, and the strain state of the rocks can be known to be compression or stretching through the increase or decrease of the hydraulic pressure. When the voltage is increased towards the positive direction, the curve is compressed, namely the positive pressure is changed upwards; when the voltage value changes towards the negative direction, the curve is stretched, namely the negative direction is tensile, and the curve changes downwards.
The existing defects in the prior art are mainly that the existing pressure sensor 3 adopts a diffused silicon differential pressure sensor which is arranged on a partition plate, and a differential pressure sensor diaphragm is used as a sensing part of a measuring cavity 5 and a sensing cavity 7 to finish the measurement of the pressure difference between the measuring cavity 5 and the sensing cavity 7.
When the earth crust drilling hole volume type strain gauge is applied, a probe is coupled into a rock hole underground by using expansion cement, although 2 pressure sensors 3 are installed at present, one is a main sensor, and the other is a backup differential pressure sensor, if the pressure sensor 3 is damaged by lightning in working, most of the pressure sensors 3 are damaged by lightning, so that the upper cavity and the lower cavity are conducted due to the damage of the diaphragms, the pressure difference between the upper cavity and the lower cavity cannot be maintained, the pressure sensor 3 loses sensitivity, even if the backup sensor is intact, the earth crust drilling hole volume type strain gauge cannot normally work, and the change of strain cannot be measured. The probe cannot be removed for servicing due to cement consolidation. If the observation needs to be recovered, the underground probe can only be drilled out by drilling, repaired or replaced and reinstalled, and in addition, the high-sensitivity instrument needs very long stabilization time after reinstallation and the observation recovery cost is very high.
Disclosure of Invention
The invention aims to provide a ground shell drill hole volume type strain gauge, which prolongs the service life of the strain gauge, does not need frequent maintenance for many times, saves the labor cost, and has small volume and simple installation.
The purpose of the invention is realized by the following technical scheme:
a kind of crust bores the pore type strain gauge, locate in underground bore hole, including the cylinder 10, the inner baffle 11 of cylinder 10 divides cylinder 10 into upper chamber and lower chamber, the upper chamber is the measuring chamber 5, the lower chamber is the feeling chamber 7; a metal column core 8 is arranged in the sensing cavity 7, and the sensing cavity 7 is filled with silicon oil 9; the lower part of the measuring cavity 5 is filled with silicon oil 9, and the upper part is filled with argon 2; the partition plate 11 is provided with an electromagnetic valve 4 which is used for communicating or sealing a silicone oil passage between the measuring cavity 5 and the sensing cavity 7;
more than two MEMS pressure sensors 12 are arranged in the sensing cavity 7, and the MEMS pressure sensors 12 are fixed on the lower surface of the metal column core 8 or the partition plate 11;
an independent top cavity 13 is arranged at the top of the measuring cavity 5, a circuit module 14 is arranged in the top cavity 13, a connecting wire of the MEMS pressure sensor 12 penetrates through the partition plate 11 and is connected with a top plate 16 of the measuring cavity 5 in an insulating mode to be connected with the circuit module 14, and the circuit module 14 is connected with a ground electronic circuit through an external cable 15.
The MEMS pressure sensor 12 may include two, three, four, five, or six.
The MEMS pressure sensors 12 each use a mutually independent shielding line as a connection line, and are connected independently.
And a resistance wire 6 is arranged in the sensing cavity 7, and a connecting wire of the resistance wire 6 penetrates through the partition plate 11 and is connected with a top plate 16 of the measuring cavity 5 in an insulated manner to form an external cable 15.
The lower end of the cylinder body 10 is provided with a lower cone 17.
According to the technical scheme provided by the invention, the plurality of MEMS pressure sensors are installed on the ground auger pore volume type strain gauge provided by the embodiment of the invention, and the pressure sensors adopt MEMS digital chips, so that the precision is high, the power consumption is low, the technical problem of conducting the upper cavity and the lower cavity after the diaphragm is broken in the traditional process is effectively solved, the service life of the strain gauge is prolonged, frequent maintenance is not needed for many times, the labor cost is saved, the size is small, and the installation is simple.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a prior art earth boring volumetric strain gauge;
fig. 2 is a schematic structural diagram of a volume strain gauge for earth boring according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
Embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
Examples
As shown in fig. 2, a ground shell borehole volume type strain gauge, which is arranged in an underground borehole and used for borehole strain measurement, comprises a cylinder 10, wherein a partition plate 11 is arranged in the cylinder 10 to divide the cylinder 10 into an upper cavity and a lower cavity, the upper cavity is a measurement cavity 5, and the lower cavity is a sensing cavity 7; the feeling cavity 7 is internally provided with a metal column core 8, and the metal column core 8 has the following functions: one is that metal is less compressible than silicone oil 9, making the measurement more accurate; the other is a counterweight that tends to sink into the expanding cement in the borehole when the strain gauge is installed. The sensing cavity 7 is filled with silicon oil 9; the lower part of the measuring cavity 5 is filled with silicon oil 9, and the upper part is filled with argon 2; the pressure of the argon gas 2 is P0 (P0 is set to be one atmosphere pressure, namely about 0.1MPa in the manufacturing process), the partition plate 11 is provided with an electromagnetic valve 4 which is used for communicating or closing a silicone oil passage between the measuring cavity 5 and the sensing cavity 7; the control line of the electromagnetic valve 4 is connected with an external cable 15 through the insulation of a top plate 16 of the measuring cavity 5. The insulated connection here means electrical insulation from the top plate 16, and specifically, an insulator is provided on the top plate 16, and circuit connection is performed through the insulator.
More than two MEMS pressure sensors 12 are arranged in the sensing cavity 7, MEMS (micro electro Mechanical Systems) are adopted, and the MEMS pressure sensors 12 are pressure sensors. The MEMS pressure sensor 12 is fixed on the lower surface of the metal column core 8 or the partition plate 11; the MEMS pressure sensor 12 includes two or three. Of course, there may be more, as long as the economic and space requirements are met, and as many as 5-6 have no problem. The MEMS pressure sensors 12 each use a mutually independent shielding line as a connection line, and are connected independently. After a failure, the other MEMS pressure sensors 12 may be activated to perform lightning strike protection functions. Since only the lead wire passes through the partition plate 11, the difficulty of installation is reduced.
When the volume type strain gauge for drilling holes in the earth crust is squeezed or stretched by surrounding rocks, the liquid pressure of the silicon oil 9 in the sensing cavity 7 is changed, the MEMS pressure sensor 12 measures the increase or decrease of the liquid pressure, and the strain state of the rocks can be known to be compression or stretching. When the pressure is increased towards the positive direction, the curve is compressed, namely the positive pressure is increased, and the curve is changed upwards; when the pressure value changes towards the negative direction, the curve is stretched, namely the negative is tensile, and the curve changes downwards.
An independent top cavity 13 is arranged at the top of the measuring cavity 5, a circuit module 14 is arranged in the top cavity 13, a connecting wire of the MEMS pressure sensor 12 penetrates through the partition plate 11 and is connected with the circuit module 14 in an insulating mode through a top plate 16 of the measuring cavity 5, and the insulating connection refers to electric insulation between the partition plate 11 and the top plate 16. Specifically, insulators are arranged on the partition plate 11 and the top plate 16, and circuit connection is performed through the insulators; the circuit module 14 is connected to the ground electronics via an external cable 15.
The circuit module 14 has the following functions: (1) providing power to the MEMS pressure sensor 12 of the lower chamber; (2) reading the MEMS chip data of the MEMS pressure sensor 12 through a lead; (3) and the ground electronic circuit is communicated with the ground instrument through an external cable 15.
The lower end of the cylinder body 10 is provided with a lower cone 17. Facilitating the placement of the strain gauge into the borehole. The sensing cavity 7 is internally provided with a resistance wire 6, the resistance wire 6 is used for calibrating the MEMS pressure sensor 12 by heating and expanding silicon oil 9 through electrifying the resistance wire 6 when the strain gauge works, and a connecting wire of the resistance wire 6 penetrates through the partition plate 11 and is connected with a top plate 16 of the measuring cavity 5 in an insulating manner through an external cable 15. The insulating connection here means electrical insulation between the partition plate 11 and the top plate 16, and specifically, an insulator is provided on the partition plate 11 and the top plate 16, and a circuit connection is performed through the insulator. An external cable 15 extends out through the end cap 1 to be connected with ground electronic circuits.
Compared with the body strain probe of the pressure sensor 3 in the prior art, due to the adoption of the MEMS pressure sensor 12 instead of being arranged at the through hole of the partition plate, the damage of the MEMS pressure sensor 12 arranged in the sensing cavity 7 can not lead to the conduction of the upper cavity and the lower cavity caused by the damage of the differential pressure sensor membrane. Meanwhile, the MEMS pressure sensors 12 are very small in size and can be assembled in a plurality of numbers, and other MEMS pressure sensors 12 are started after one is damaged, so that the problem that the pressure difference between an upper cavity and a lower cavity caused by lightning damage cannot be kept due to the damage of a differential pressure sensor diaphragm is solved, and the service life of the sensor is greatly prolonged. The defect that the sensor is scrapped due to the fact that the upper cavity and the lower cavity of the sensor are conducted after the sensor is struck by lightning is avoided. The MEMS pressure sensor 12 is a high precision digital chip, while improving measurement accuracy, reducing power consumption, and improving reliability.
By mechanical calculation and verification, the assembled sensor has high precision and high resolution by adopting various performance indexes of the existing high-resolution digital MEMS pressure sensor 12, so that the performance of the body strain is improved. The cost of the drilling machine, the cost of the probe, the cost of an installer and the loss of the interruption observation time of replacement are also saved, and the benefit is remarkable.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (5)
1. The utility model provides a ground shell bores pore volume formula strain gauge, locates in the underground borehole, its characterized in that: the measuring device comprises a cylinder body (10), wherein a partition plate (11) is arranged in the cylinder body (10) to divide the cylinder body (10) into an upper cavity and a lower cavity, the upper cavity is a measuring cavity (5), and the lower cavity is a sensing cavity (7); a metal column core (8) is arranged in the sensing cavity (7), and silicone oil (9) is filled in the sensing cavity (7); the lower part of the measuring cavity (5) is filled with silicon oil (9), and the upper part of the measuring cavity is filled with argon (2); the partition plate (11) is provided with an electromagnetic valve (4) which is used for communicating or sealing a silicone oil passage between the measuring cavity (5) and the sensing cavity (7);
more than two MEMS pressure sensors (12) are arranged in the sensing cavity (7), and the MEMS pressure sensors (12) are fixed on the lower surface of the metal column core (8) or the partition plate (11);
the measuring cavity (5) is provided with an independent top cavity (13) at the top, a circuit module (14) is arranged in the top cavity (13), a connecting line of the MEMS pressure sensor (12) penetrates through the partition plate (11) and is connected with the circuit module (14) in an insulation mode with a top plate (16) of the measuring cavity (5), and the circuit module (14) is connected with a ground electronic circuit through an external cable (15).
2. The earth borehole volumetric strain gauge according to claim 1, wherein the MEMS pressure sensor (12) comprises two, three, four, five or six.
3. The earth boring volumetric strain gauge according to claim 1 or 2, characterized in that the MEMS pressure sensors (12) are each connected independently using mutually independent shielded wires as connecting wires.
4. The earth crust drilling volumetric strain gauge according to claim 1 or 2, characterized in that a resistance wire (6) is arranged in the sensing cavity (7), and a connecting wire of the resistance wire (6) passes through the partition plate (11) and is connected with an external cable (15) in an insulated manner with a top plate (16) of the measuring cavity (5).
5. A crustal drilling volumetric strain gauge according to claim 1 or 2, characterized in that said cylindrical body (10) is provided at its lower end with a lower cone (17).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010383586.XA CN111413730B (en) | 2020-05-08 | 2020-05-08 | Crust drilling volume type strain gauge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010383586.XA CN111413730B (en) | 2020-05-08 | 2020-05-08 | Crust drilling volume type strain gauge |
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| Publication Number | Publication Date |
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| CN111413730A true CN111413730A (en) | 2020-07-14 |
| CN111413730B CN111413730B (en) | 2024-06-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010383586.XA Active CN111413730B (en) | 2020-05-08 | 2020-05-08 | Crust drilling volume type strain gauge |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114046766A (en) * | 2021-09-24 | 2022-02-15 | 广东省交通规划设计研究院集团股份有限公司 | Device and method for testing stress-strain based on soil layer in drill hole |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02189434A (en) * | 1989-01-19 | 1990-07-25 | Kagaku Gijutsucho Kokuritsu Bosai Kagaku Gijutsu Center | Bore-hole type axial direction strain gage |
| US20020047304A1 (en) * | 2000-07-18 | 2002-04-25 | Marc Bolitho | Pressure sensor integrated onto sleeve of solenoid valve |
| US20100018702A1 (en) * | 2006-12-21 | 2010-01-28 | John Cook | System and method for robustly and accurately obtaining a pore pressure measurement of a subsurface formation penetrated by a wellbore |
| CN206540518U (en) * | 2017-03-16 | 2017-10-03 | 中国地震局地壳应力研究所 | A kind of new volume type strain observation instrument based on fibre optic compression sensor |
| CN108059124A (en) * | 2016-11-08 | 2018-05-22 | 盾安美斯泰克股份有限公司 | The method that the MEMS die for welding attachment is self-aligned to installation surface |
| CN211878201U (en) * | 2020-05-08 | 2020-11-06 | 中国地震局地壳应力研究所 | Earth crust drilling volume type strain gauge |
-
2020
- 2020-05-08 CN CN202010383586.XA patent/CN111413730B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02189434A (en) * | 1989-01-19 | 1990-07-25 | Kagaku Gijutsucho Kokuritsu Bosai Kagaku Gijutsu Center | Bore-hole type axial direction strain gage |
| US20020047304A1 (en) * | 2000-07-18 | 2002-04-25 | Marc Bolitho | Pressure sensor integrated onto sleeve of solenoid valve |
| US20100018702A1 (en) * | 2006-12-21 | 2010-01-28 | John Cook | System and method for robustly and accurately obtaining a pore pressure measurement of a subsurface formation penetrated by a wellbore |
| CN108059124A (en) * | 2016-11-08 | 2018-05-22 | 盾安美斯泰克股份有限公司 | The method that the MEMS die for welding attachment is self-aligned to installation surface |
| CN206540518U (en) * | 2017-03-16 | 2017-10-03 | 中国地震局地壳应力研究所 | A kind of new volume type strain observation instrument based on fibre optic compression sensor |
| CN211878201U (en) * | 2020-05-08 | 2020-11-06 | 中国地震局地壳应力研究所 | Earth crust drilling volume type strain gauge |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114046766A (en) * | 2021-09-24 | 2022-02-15 | 广东省交通规划设计研究院集团股份有限公司 | Device and method for testing stress-strain based on soil layer in drill hole |
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| CN111413730B (en) | 2024-06-21 |
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Country or region after: China Address after: 100085, Anning Road, Haidian District, Beijing, 1, Xisanqi Applicant after: National natural disaster prevention and Control Research Institute Ministry of emergency management Address before: 100085, Anning Road, Haidian District, Beijing, 1, Xisanqi Applicant before: THE INSTITUTE OF CRUSTAL DYNAMICS, CHINA EARTHQUAKE ADMINISTRATION Country or region before: China |
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