CN114777963B - Stress strain sensor hole wall coupling device - Google Patents
Stress strain sensor hole wall coupling device Download PDFInfo
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- CN114777963B CN114777963B CN202210416622.7A CN202210416622A CN114777963B CN 114777963 B CN114777963 B CN 114777963B CN 202210416622 A CN202210416622 A CN 202210416622A CN 114777963 B CN114777963 B CN 114777963B
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- stress
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- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/32—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring the deformation in a solid
Abstract
The invention relates to the technical field of ground stress monitoring, in particular to a stress strain sensor hole wall coupling device. The stress strain sensor hole wall coupling device comprises a base, a shell, a piston, filler and a sealing film; the base is arranged at one end of the shell; the shell is cylindrical, the piston and the filler are both arranged in the shell, and one end of the piston, which is far away from the filler, is provided with a connector; the one end that the casing is close to the base is provided with first exhalant outlet, seals the membrane setting at first exhalant outlet, seals the membrane and is used for carrying out the shutoff to first exhalant outlet. The embodiment of the invention has the beneficial effects that: the filler is extruded through the piston, is discharged from the first discharge port of the shell and then is distributed between the shell and the hole wall, and after the filler is completely filled and solidified, a regular round drilling hole can be obtained, so that the coupling between the sensor and the hole wall can be ensured, the normal contact between the sensor and the hole wall is further ensured, and the accuracy of ground stress monitoring is improved.
Description
Technical Field
The invention relates to the technical field of ground stress monitoring, in particular to a stress strain sensor hole wall coupling device.
Background
Geostress is a natural force that is objectively present in the body of the crustal rock and is not subject to engineering perturbations. The ground stress monitoring is to know the change of the stress value in the earth crust along with the time, and is a real-time dynamic stress measurement. The stress-strain continuous dynamic monitoring is carried out at shallow parts or deep parts of the earth crust, and is very necessary for the prediction and research of earthquakes.
The basic principle of the ground stress monitoring method is that a measuring probe is arranged in a drilled hole of the crustal rock body, the drilled hole generates micro strain in the crustal rock body under the deformation of tectonic stress, and the continuous output value of the measuring element is recorded under the condition that the measuring element is well coupled with the wall of the drilled hole, namely the dynamic change value of the crustal rock stress value along with time can be measured.
The continuous dynamic monitoring technology of crustal stress strain is suitable for a piezomagnetic component stress gauge, a capacitance component strain gauge and a body strain gauge of crustal stress monitoring equipment. In seismic prediction research, the most common device for geostress monitoring is the piezomagnetic component stress gauge.
The core measuring element of the piezomagnetic stress monitoring system is a piezomagnetic stress meter which is designed based on the magnetostrictive principle. The theoretical basis is that mechanical deformation causes a change in the magnetic properties of ferromagnetic materials, known as the piezomagnetic effect. The sensitive element of the piezomagnetic stressometer is a self-induction coil which is made by winding a coil with a certain number of turns on a ferromagnetic material serving as a mandrel. If the mandrel coil is electrified with constant alternating current, when the axial pressure applied along the mandrel changes, the magnetic permeability of the mandrel also changes, further the inductance or voltage drop of the coil also changes, and the change of the pressure is represented as the change of the voltage reading of the acquisition instrument.
The underground installation process of the existing piezomagnetic component stress instrument is as follows:
firstly, the monitoring equipment is lowered to the target layer depth through a drill rod, and then the loader is operated by the underground controller through the aboveground controller to load and unload the piezomagnetic stress sensor and separate the piezomagnetic stress sensor from the piezomagnetic stress sensor. When the loader finishes the loading of prestress on the monitoring probe in each direction of the sensor, the underground controller and the loader are separated from the sensor under the driving of a drill rod of the drilling machine, and the aboveground controller can monitor the states of the underground controller and the sensor in real time. After the piezomagnetic measuring element is installed in the measuring small hole, a certain prestress is applied to the piezomagnetic measuring element, the piezomagnetic measuring element is in close contact with a rock body on the hole wall, and the piezomagnetic measuring element is oriented to enable the piezomagnetic measuring element to be well coupled with the rock wall.
In all the crustal stress monitoring methods at home and abroad, a common piezomagnetic method is adopted, a measuring element is directly installed in a drill hole, and a sensor directly abuts against the wall of a rock hole. The method can accurately monitor the ground stress under the conditions of drilling and rock ideal conditions.
However, in the case that the bore hole is not perfectly circular due to various objective factors such as the drilling level, or the rock body at the observation point is incomplete, so that the hole wall has cracks, even falls, the sensor of the measuring element cannot normally contact with the hole wall, and the method faces the serious problem of coupling between the sensor and the hole wall of the bore hole.
Disclosure of Invention
The invention aims to provide a stress strain sensor hole wall coupling device which can ensure the coupling of a sensor and the hole wall of a drill hole and ensure that the deformation of the drill hole is accurately transmitted to a measuring element.
The embodiment of the invention is realized by the following steps:
the invention provides a stress strain sensor hole wall coupling device which comprises a base, a shell, a piston, fillers and a sealing film, wherein the base is provided with a hole;
the base is arranged at one end of the shell;
the shell is cylindrical, the piston and the filler are both arranged in the shell, and one end, far away from the filler, of the piston is provided with a connector;
the casing is close to the one end of base is provided with first exhalant outlet, it sets up to seal the membrane first exhalant outlet, it is right to seal the membrane first exhalant outlet carries out the shutoff.
Preferably, be provided with at least one first exhaust hole on the casing, the one end setting of first exhaust hole is in the casing is close to the one end of base, the other end setting of first exhaust hole is in inside the casing, and the piston will the filler is followed warp in the casing after first exhaust port extrudes, first exhaust hole with second exhaust hole intercommunication on the connector.
Preferably, a second discharge port is arranged on the base, and the second discharge port is arranged corresponding to the first discharge port.
Preferably, the base includes a bottom plate and a bracket, the second outlet is disposed on the bottom plate, and the bracket is disposed on a side of the bottom plate away from the housing.
Preferably, a clamping groove is formed in the shell, and a clamping pin is arranged on the joint;
when the piston extrudes the filler out of the shell through the first discharge port, the clamping pin is clamped in the clamping groove.
Preferably, the shell is connected with the base in a threaded manner.
Preferably, the thread direction of the shell is opposite to that of the connector.
Preferably, the piston is connected with the shell through a breakable pin.
Preferably, the piston is provided with a release layer on one end close to the filler and the outer surface of the shell.
Preferably, the filler is cement.
The embodiment of the invention has the beneficial effects that:
through piston extrusion filler, make its first delivery port discharge back from the casing, distribute between casing and pore wall, treat that the filler fills and finish and solidify the back, can obtain just circular shape drilling, can guarantee the coupling of sensor and pore wall, and then guarantee the normal contact of sensor and pore wall, improved the accuracy of ground stress monitoring.
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 embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a diagram illustrating a hole-wall coupling device of a stress-strain sensor according to an embodiment of the present invention when a piston is not compressing a filler;
FIG. 2 is a state diagram of a stress-strain sensor hole-wall coupling device provided in an embodiment of the present invention after a filler is extruded out of a housing by a piston;
FIG. 3 isbase:Sub>A sectional view A-A of FIG. 2;
fig. 4 is a schematic diagram of a state of a borehole after the stress-strain-sensor hole-wall coupling apparatus provided in the embodiment of the present invention is taken out from the borehole;
fig. 5 is a top view of fig. 4.
Icon:
1: drilling; 2: a hole wall; 3: a connector; 4: a piston; 5: a card slot; 6: a pin is easy to break; 7: a first exhaust port; 8: a first discharge port; 9: sealing the film; 10: a second discharge port; 11: a support; 12: a base plate; 13: a filler; 14: a housing; 15: a bayonet lock; 16: mounting grooves; 17: a pressure spring; 18: a second vent hole;
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be 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 some, but not all embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present invention, it should also be noted that, unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Some embodiments of the present invention will be described in detail below with reference to fig. 1 to 5. The embodiments described below and the features of the embodiments can be combined with each other without conflict.
In the prior art, researchers at home and abroad mostly concentrate on the research and the manufacture of various drilling 1 instruments, and strive to improve the measurement accuracy and the operation reliability.
The good quality of observation instruments is not equal to the good quality of data, and an important problem to be solved in practical application of instruments for geophysical observation is how to realize coupling with the earth. How to perfectly couple the ground stress monitoring equipment with the borehole 1 determines whether the measuring element can accurately capture and pick up the strain of the borehole 1, namely, the ground stress monitoring equipment is coupled with the crustal rock of the earth, so that the accuracy and precision of observing the change of the crustal stress are influenced.
Based on the problems, the invention provides a stress strain sensor hole wall coupling device, which comprises a base, a shell 14, a piston 4, a filler 13 and a sealing film 9; the base is arranged at one end of the shell 14; the shell 14 is cylindrical, the piston 4 and the filler 13 are both arranged in the shell 14, and one end of the piston 4, which is far away from the filler 13, is provided with the connector 3; one end of the shell 14 close to the base is provided with a first discharge port 8, the sealing film 9 is arranged at the first discharge port 8, and the sealing film 9 is used for sealing the first discharge port 8.
Specifically, the sealing film 9 seals the lower part of the filler 13, the piston 4 seals the upper end of the filler 13, so that the filler 13 can stably enter the drill hole 1 before being extruded by the piston 4, and the drill rod is connected with the piston 4 through the connector 3 to drive the whole stress-strain sensor hole wall coupling device to move downwards so as to enter the drill hole 1. The drill rod continuously moves downwards to drive the piston 4 to move downwards to extrude the filler 13, the filler 13 is pressed to break the sealing film 9, the filler 13 can be discharged from the first discharge port 8 and further to the lower side or the outer side of the shell 14, a cylindrical structure is formed between the shell 14 and the hole wall 2 of the drill hole 1, after the filler 13 is solidified, the drill rod is started, the stress-strain sensor hole wall coupling device is taken out of the drill hole 1, a circular hole structure can be obtained, the stress-strain sensor hole wall coupling device can be completely coupled with the stress-strain sensor, and the measuring accuracy is improved.
Preferably, at least one first vent hole 7 is formed in the housing 14, one end of the first vent hole 7 is disposed at one end of the housing 14 close to the base, the other end of the first vent hole 7 is disposed inside the housing 14, and after the piston 4 extrudes the filler 13 from the housing 14 through the first vent hole 8, the first vent hole 7 is communicated with the second vent hole 18.
When the piston 4 and the housing 14 need to be taken out of the borehole 1 after the filler 13 is extruded from the interior of the housing 14 by the piston 4 and the filler 13 is solidified, air can enter between the housing 14 and the borehole wall 2 through the communicated first exhaust hole 7 and the second exhaust hole 18, so that the housing 14 can be normally taken out of the borehole 1, and the housing 14 cannot be taken out due to the generation of negative pressure between the borehole wall 2 of the borehole 1 and the outer wall of the housing 14.
Preferably, the base is provided with a second outlet 10, and the second outlet 10 is arranged corresponding to the first outlet 8. Specifically, the base includes a bottom plate 12 and a bracket 11, the second outlet 10 is disposed on the bottom plate 12, and the bracket 11 is disposed on a side of the bottom plate 12 away from the housing 14.
In this embodiment, the base is contacted with the bottom of the hole through the bracket 11, the bottom plate 12 supports the housing 14, the second discharge port 10 is provided on the bottom plate 12, and the second discharge port 10 is provided corresponding to the first discharge port 8, so that the filler 13 can be discharged from the first discharge port 8 and the second discharge port 10 to the outside, enter the lower part of the housing 14, and further enter between the housing 14 and the hole wall 2.
Preferably, a clamping groove 5 is formed in the shell 14, and a clamping pin 15 is arranged on the joint; when the piston 4 pushes the filler 13 out of the housing 14 through the first outlet 8, the locking pin 15 is locked in the locking groove 5.
In this embodiment, the engagement between the engaging groove 5 and the engaging pin 15 realizes the fixed connection between the piston 4 and the housing 14, and further, the external force is applied to the piston 4 through the drill rod, so that the entire piston 4 and the housing 14 can be taken out of the drill hole 1.
In this embodiment, a mounting groove 16 is formed in a side wall of the joint, the bayonet 15 is arranged in the mounting groove 16, an elastic element is arranged at a bottom of the mounting groove 16, the bayonet 15 is applied with an outward ejecting force through the elastic element, after the mounting groove 16 is aligned with the bayonet 5, the bayonet 15 is ejected from the mounting groove 16 under the action of the elastic element, a part of the bayonet 15 is inserted into the bayonet 5, a part of the bayonet is arranged in the mounting groove 16, the connector 3 is connected with the housing 14, and the piston 4 and the housing 14 are integrally lifted out of the drill hole 1.
In the present embodiment, the elastic element is a compression spring 17.
It should be noted that the elastic element may be a compression spring 17, but it is not limited to the compression spring 17, and it may also be other components with elasticity, such as an elastic sheet, etc., as long as it can push the bayonet 15 out of the mounting groove 16.
In this embodiment, the bayonet 15 is inserted into the bayonet slot 5, so that when the connector 3 is connected to the housing 14, the first vent hole 7 and the second vent hole 18 are aligned and communicated.
Preferably, the connection between the housing 14 and the base is a threaded connection.
It should be noted that, in the present embodiment, the connection manner between the housing 14 and the base is a threaded connection, but it is not limited to the threaded connection, and it may also be another connection manner, such as clamping connection, etc., that is, as long as the connection between the housing 14 and the base can be achieved.
Preferably, the thread on the housing 14 is opposite to the thread on the connection head 3.
In this embodiment, the connection between the housing 14 and the base has a reverse thread direction, the connection between the connector 3 and the drill rod has a reverse thread direction, the connector 3 is a universal connector, and the thread direction is a forward thread direction.
The opposite rotation direction enables the drill rod to continue to drive the piston 4 to rotate after the housing 14 and the piston 4 are connected together through the bayonet 15, so that the housing 14 and the base can be separated, and the aim of taking the hole wall coupling device out of the drill hole 1 is fulfilled.
Preferably, the piston 4 is connected to the housing 14 by a frangible pin 6.
In this embodiment, the piston 4 is connected to the housing 14 by the breakable pin 6 before the piston 4 presses the filler 13, thereby achieving temporary fixation.
When the piston 4 begins to extrude the filler 13, the drill rod presses downwards, the piston 4 extrudes downwards, the breakable pin 6 is broken under the action of the torque, and the piston 4 can normally fall.
Preferably, the piston 4 is provided with a release layer on one end near the filler 13 and on the outer surface of the housing 14.
Through the setting of the demoulding layer, the shell 14 and the piston 4 can be smoothly separated from the filler 13, and the shell 14 can be smoothly taken out from the drill hole 1.
Preferably, the filler 13 is cement.
It should be noted that, in the present embodiment, the filler 13 is cement, but it is not limited to cement, and it may be another filler 13 as long as it can realize stress transmission to the hole wall 2 after solidification between the shell 14 and the hole wall 2.
The use process of the stress strain sensor hole wall coupling device provided by the invention is as follows:
the upper part of a piston 4 of the stress strain sensor hole wall coupling device is provided with a connector 3, the connector 3 can be connected with a universal drill rod connector in the drilling industry, and connector threads in the industry are default positive threads. The drill rod is lowered to a designated position (i.e. the bottom of the hole) in the borehole 1 with the device, and during the lowering process, the breakable pin 6 temporarily fixes the piston 4 to the cylindrical housing 14, and the inner cavity of the housing 14 is filled with special cement. The fixing function of the breakable pin 6 and the blocking of the breakable film ensure that cement is not extruded before reaching the bottom of the hole. Finally, the base support 11 is brought into contact with the bottom of the bore hole 1.
After the base is contacted with the bottom of the hole, a person at a wellhead on the ground applies force to the drill rod through a drilling machine to break the breakable pin 6 and continuously push the drill rod to enable the piston 4 to reach the bottom of the shell 14; meanwhile, the breakable sealing film 9 is broken, the special cement in the inner cavity is completely extruded out from the first exhaust hole 8 at the bottom of the shell 14 under the push of the piston 4, and air can be smoothly expelled upwards through the first exhaust hole 7 and the second exhaust hole 18 when the cement is extruded out from the shell 14. Eventually, the special cement fills the spaces between the casing 14 and the bore wall 2 and between the casing 14 and the bore bottom.
After waiting for 24 hours, the specialty cement sets completely and consolidates completely with the surrounding rock. Under the spring action, the activity pin gets into draw-in groove 5, and the angular relation of piston 4 and drum this moment, the exhaust passage UNICOM of piston 4 and the exhaust passage UNICOM of drum (supposing that the activity pin is not at the angular position of draw-in groove 5, can guarantee during the rotatory angular position of in-process in the next step forward that the activity pin gets into draw-in groove 5 in the twinkling of an eye). In the rotating process of forward rotation of the drill rod (namely the forward thread screwing direction), the piston 4 (under the action of the movable pin and the clamping groove 5) can drive the cylinder to rotate together, and the base is connected with the cylinder through the reverse thread, namely, the cylinder and the base can be separated under the forward rotation of the cylinder. After separation, as the outer surface of the cylinder body and the bottom of the piston 4 are both provided with the demoulding layer, the upper drill rod and the pulling-out device can be ensured to be pulled out from the consolidated cement smoothly under the action of the demoulding layer and the exhaust channel.
Finally, a thin complete right circular hole wall 2 is formed on the hole wall 2, so that the sensor can be perfectly coupled with the hole wall 2 after being put into the hole, and the accuracy and precision of ground stress monitoring are guaranteed.
The embodiment of the invention has the beneficial effects that:
the filler 13 is extruded through the piston 4, is discharged from the first discharge port 8 of the shell 14 and then is distributed between the shell 14 and the hole wall 2, and after the filler 13 is completely filled and solidified, a regular round drilling hole 1 can be obtained, so that the coupling of the sensor and the hole wall 2 can be ensured, the normal contact between the sensor and the hole wall 2 is further ensured, and the accuracy of ground stress monitoring is improved.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A stress strain sensor hole wall coupling device is characterized by comprising a base, a shell, a piston, filler and a sealing film;
the base is arranged at one end of the shell;
the shell is cylindrical, the piston and the filler are both arranged in the shell, and one end of the piston, which is far away from the filler, is provided with a connector;
a first discharge port is formed in one end, close to the base, of the shell, the sealing film is arranged at the first discharge port, and the sealing film is used for sealing the first discharge port;
be provided with at least one first exhaust hole on the casing, the one end setting of first exhaust hole is in the casing is close to the one end of base, the other end setting of first exhaust hole is in inside the casing, and the piston will the filler is followed warp in the casing after first exhaust opening extrudes, first exhaust hole with second exhaust hole intercommunication on the connector.
2. The hole wall coupling device for a stress strain sensor according to claim 1, wherein a second outlet is provided on the base, and the second outlet is provided corresponding to the first outlet.
3. The stress-strain-sensor hole-wall coupling device of claim 2, wherein the base comprises a bottom plate and a bracket, the second outlet is disposed on the bottom plate, and the bracket is disposed on a side of the bottom plate away from the housing.
4. The stress-strain sensor hole wall coupling device according to claim 1, wherein a clamping groove is formed in the shell, and a clamping pin is arranged on the connecting head;
when the piston extrudes the filler out of the shell through the first discharge port, the clamping pin is clamped in the clamping groove.
5. The stress-strain-sensor hole-wall coupling device of claim 4, wherein the connection between the housing and the base is a threaded connection.
6. The stress-strain-sensor hole-wall coupling device of claim 5, wherein the thread on the housing is opposite to the thread on the connector.
7. The stress-strain-sensor hole-wall coupling device of claim 1, wherein the piston is connected with the housing through a breakable pin.
8. The stress-strain-sensor hole-wall coupling device of claim 1, wherein the piston is provided with a release layer on one end close to the filler and on the outer surface of the housing.
9. The stress-strain-sensor hole-wall coupling device of claim 1, wherein the filler is cement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202210416622.7A CN114777963B (en) | 2022-04-20 | 2022-04-20 | Stress strain sensor hole wall coupling device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210416622.7A CN114777963B (en) | 2022-04-20 | 2022-04-20 | Stress strain sensor hole wall coupling device |
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| CN114777963A CN114777963A (en) | 2022-07-22 |
| CN114777963B true CN114777963B (en) | 2022-10-21 |
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Family Cites Families (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4453401A (en) * | 1982-03-12 | 1984-06-12 | The United States Of America As Represented By The Secretary Of The Air Force | Pressure sensor and soil stress isolation filter arrangement in a pore pressure probe |
| US4805449A (en) * | 1987-12-01 | 1989-02-21 | Anadrill, Inc. | Apparatus and method for measuring differential pressure while drilling |
| DE4002910A1 (en) * | 1990-02-01 | 1991-08-08 | Pfister Gmbh | Silicone oil- or gel-filled force measurement device - allows attitude change between rigid piston and housing for uniform pressure loading of strain-gauge diaphragm |
| JPH1082669A (en) * | 1996-09-05 | 1998-03-31 | Shojiro Nakano | Apparatus for simultaneously measuring water pressure and strain in gap |
| CN201555674U (en) * | 2009-12-21 | 2010-08-18 | 中国地震局地壳应力研究所 | Pre-stress applying device of piezomagnetic stressometer |
| NL2008275C2 (en) * | 2012-02-10 | 2013-08-14 | Draka Holding N V | Strain sensor, manufacturing method and system. |
| CN102914393B (en) * | 2012-09-28 | 2014-10-29 | 山东科技大学 | Active pressure-bearing type positioning borehole stress meter and use method thereof |
| CN104280167B (en) * | 2014-10-13 | 2016-06-01 | 中国科学院武汉岩土力学研究所 | The hollow inclusion three dimensional stress test set of rock mass engineering project single hole multiple spot fiber grating |
| CN105572231B (en) * | 2016-01-27 | 2018-01-23 | 武汉大学 | System is implemented in a kind of acoustic emission monitor(ing) suitable for TBM tunnels |
| CN207366116U (en) * | 2017-10-15 | 2018-05-15 | 安徽理工大学 | A kind of recyclable geostress survey device |
| CN107830960B (en) * | 2017-12-06 | 2018-10-30 | 中国地质科学院地质力学研究所 | A kind of hydrofracturing packer device |
| CN111878060B (en) * | 2020-08-14 | 2022-10-04 | 中煤科工集团重庆研究院有限公司 | Installation device and method for monitoring sensor in coal rock stratum drilling hole |
| CN112461189B (en) * | 2020-11-03 | 2021-07-23 | 中国地质科学院地质力学研究所 | Ground stress measuring strain gauge |
| CN216081844U (en) * | 2021-07-20 | 2022-03-18 | 兖矿能源集团股份有限公司 | Novel three-dimensional stress monitoring device for stope surrounding rock |
| CN113670491A (en) * | 2021-08-17 | 2021-11-19 | 中国矿业大学 | Chemical expansion rubber-pushing type hollow capsule geostress meter and method |
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2022
- 2022-04-20 CN CN202210416622.7A patent/CN114777963B/en active Active
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