CN209570443U - A kind of geostress survey device considering temperature effect - Google Patents
A kind of geostress survey device considering temperature effect Download PDFInfo
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- CN209570443U CN209570443U CN201920320388.1U CN201920320388U CN209570443U CN 209570443 U CN209570443 U CN 209570443U CN 201920320388 U CN201920320388 U CN 201920320388U CN 209570443 U CN209570443 U CN 209570443U
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- extensometer
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Abstract
A kind of geostress survey device considering temperature effect, belong to highland temperature area geostress survey technical field, the measuring device includes rack, pressure rod, electric heater unit, high-pressure oil pipe, client, hydraulic power station, the first extensometer, the second extensometer, temperature sensor and hydraulic cylinder, and client is connect with electric heater unit, hydraulic power station, the first extensometer, the second extensometer, temperature sensor, hydraulic cylinder and the pressure sensor being arranged on pressure rod respectively by conducting wire；Electric heater unit is used to heat the rock sample placed inside it；First extensometer is used to acquire the axial strain data of rock sample；Second extensometer is used to acquire the radial strain data of rock sample, and temperature sensor is for acquiring rock sample temperature, the application pressure data of the acquired pressure rod of pressure sensor.The utility model to improve in the reliability of highland temperature area geostress survey.
Description
Technical field
The utility model belongs to highland temperature area geostress survey technical field, in particular to a kind of consideration temperature effect
Geostress survey device.
Background technique
As the increase of china natural resources depth of exploration and the increasing of underground geothermal resource exploration exploitation dynamics, geostress survey are got over
To be related to High temperature rocks more.After boring up to predetermined depth and taking out high temperature rock sample, the temperature of rock is under field conditions (factors)
Can gradually decrease, partial elasticity when the inclined plasticity when mechanical characteristic of rock is by from high temperature is to room temperature changes, internal stress size and
Direction can also change, and this will lead to measured crustal stress in situ that there are errors, it is therefore necessary to realize high temperature rock sample
Geostress survey.
Detecting earth stress method has hydraulic fracturing, stress relief method, strain restoring method, DRA method at present
(Deformation rate analysis, rate of deformation analytic approach), acoustic emission effect method etc..Hydraulic fracturing is directly will
Measuring instrument is put into the method that bottom hole carries out geostress survey, deep hole operation is not suitable for because its is complicated for operation, and its master answers
Power direction is difficult to accurate determination；Stress relief method there is a problem of complicated for operation；Stress restoration is only applicable to shallow stratum；Sound
Transmitting effect method is to carry out crustal stress according to the opening of rock core internal fissure, closure situation to determine, high temperature will affect stress state into
And the state of crackle is influenced, therefore be not also suitable for the stress measurement of deep hole high-temperature stratum.DRA method is due to its economic, efficient, behaviour
Make the advantages such as simple, has become a kind of main measurement crustal stress method at present.But in measurement process, due to not considering temperature
Influence to rock interior state there are problems that in high temperature region measurement crustal stress poor reliability.
Utility model content
To solve the problems, such as that existing DRA earth stress measuring method not yet considers temperature effect, exist in high temperature region measurement
The problem of crustal stress poor reliability, the purpose of the utility model is to provide it is a kind of consider temperature effect geostress survey device,
The measuring device structure is simple, can to rock sample carry out quickly, be evenly heated, after being heated to predetermined temperature, pass through institute
The crustal stress that measuring device measurement considers temperature effect is stated, the reliability of acquired results is improved, expands DRA earth stress measuring method
Application range.
In order to achieve the above objectives, the utility model adopts the following technical solutions: a kind of crustal stress for considering temperature effect
Measuring device characterized by comprising rack, pressure rod, electric heater unit, high-pressure oil pipe, client, hydraulic power station,
One extensometer, the second extensometer, temperature sensor and hydraulic cylinder, the hydraulic cylinder are mounted on the lower center position of rack, liquid
Cylinder pressure is connect by high-pressure oil pipe with hydraulic power station, and the piston rod of hydraulic cylinder is connect with pressure rod top；The pressure rod
Lower part is provided with pressure sensor；The client is extended with electric heater unit, hydraulic power station, first respectively by conducting wire
Meter, the second extensometer, temperature sensor, hydraulic cylinder and the pressure sensor connection being arranged on pressure rod；The electric heating dress
It sets for being heated to the rock sample placed inside it；First extensometer is mounted on rock sample, and the first extensometer is for acquiring rock sample
Axial strain data；Second extensometer is mounted on rock sample, and the second extensometer is used to acquire the radial strain number of rock sample
According to the probe of temperature sensor is arranged on the side wall of rock sample, and temperature sensor is for acquiring rock sample temperature.
The geostress survey device for considering temperature effect further includes support rod, and support rod is used for fixed frame.
Thermally insulating housing is equipped on the outside of the pressure rod.
The electric heater unit is made of heating tube, attemperator and Heat-insulation device, and attemperator and Heat-insulation device surround
The hollow cylindrical structure of open top, heating tube is coaxial with the hollow cylindrical structure and sets within it on side wall, adds
Heat pipe is twist arranged.
Described first, which extends, is calculated as model 3549-025M-0101- ST extensometer.
Described second, which extends, is calculated as model 3580-025M-0101- ST extensometer.
The temperature sensor is silicon dioxide insulator thermocouple.
Through the above design, the utility model can be brought the following benefits: the utility model passes through electric heating
Device assigns temperature property of the rock sample at prime stratum, ensure that the original position of rock sample internal stress and mechanical characteristic.The dress
It sets the strain data loaded twice to subtract each other, and then determines crustal stress, will directly heat generated thermal strain and offset
Disappear, and the device is improved in the reliability of highland temperature area geostress survey, further expands DRA earth stress measuring method
Application range.
Detailed description of the invention
Attached drawing described herein is used to provide a further understanding of the present invention, and is constituted part of this application,
The utility model illustrative embodiments and their description do not constitute the improper limit of the utility model for understanding the utility model
It is fixed, in the accompanying drawings:
Fig. 1 is the overall schematic that the geostress survey device of temperature effect is considered in the utility model embodiment.
Fig. 2 is the partial enlarged view of Fig. 1.
Fig. 3 is the partial top view of Fig. 1.
Fig. 4 is the orientation maps of six roots of sensation rock sample in the utility model embodiment.
Fig. 5 is the strain-stress relational graph considered under temperature effect in the utility model embodiment.
Fig. 6 is the relational graph that the stress-strain difference under temperature effect is considered in the utility model embodiment
Respectively mark in figure as follows: 1- rack, 2- pressure rod, 3- support rod, 4- electric heater unit, 41- heating tube, 42- are protected
Warm device, 43- Heat-insulation device, 5- rock sample, 6- high-pressure oil pipe, 7- client, 8- hydraulic power station, the first extensometer of 9-, 10-
Two extensometers, 11- temperature sensor, 12- hydraulic cylinder.
Specific embodiment
In order to illustrate more clearly of the utility model, the utility model is done into one below with reference to preferred embodiments and drawings
The explanation of step.It will be appreciated by those skilled in the art that specifically described content is illustrative and be not restrictive below, no
It should limit the protection scope of the present invention.
In the present invention, for ease of description, the description of the relative positional relationship of each component is according to specification
The Butut mode of attached drawing is described, such as the positional relationship of upper and lower, left and right is Butut side according to Figure of description
Always it determines.
High-geotemperature described in the utility model refers to that ground temperature reaches 100 degrees Celsius or more.
As shown in Figure 1, Figure 2 and Figure 3, the utility model proposes the considerations of temperature effect geostress survey device include machine
Frame 1, pressure rod 2, support rod 3, electric heater unit 4, high-pressure oil pipe 6, client 7, hydraulic power station 8, the first extensometer 9,
Two extensometers 10, temperature sensor 11 and hydraulic cylinder 12, the hydraulic cylinder 12 is mounted on the lower center position of rack 1, hydraulic
Cylinder 12 is connect by high-pressure oil pipe 6 with hydraulic power station 8, and the piston rod of hydraulic cylinder 12 is connect with 2 top of pressure rod, hydraulic cylinder 12
Movement is retracted with upward for realizing the downward feed movement of pressure rod 2；The lower part of the pressure rod 2 is provided with pressure sensing
Device is equipped with thermally insulating housing on the outside of pressure rod 2, to protect pressure rod 2, while the lasting progress of guarantee test；The support rod 3
For fixed frame 1；The client 7 by conducting wire respectively with electric heater unit 4, hydraulic power station 8, the first extensometer 9, the
Two extensometers 10, temperature sensor 11, hydraulic cylinder 12 and the pressure sensor connection being arranged on pressure rod 2；The electric heating
Device 4 is made of heating tube 41, attemperator 42 and Heat-insulation device 43, and attemperator 42 and Heat-insulation device 43 surround open top
Hollow cylindrical structure, heating tube 41 is coaxial with the hollow cylindrical structure and sets within it on side wall, heating tube 41
It twist arranges, when High-geotemperature drills region boring sample 5, the original locating High-geotemperature probing area of rock sample 5 need to be obtained in advance
Domain temperature T, wherein the probing of High-geotemperature locating for rock sample 5 region T is obtained by platinum resistance probe measurement or according to ground temperature gradiometer,
The rock sample 5 drilled through is threaded through 4 inside of heating device and its bottom is fixed on to the top center position of Heat-insulation device 43, rock sample
5 is coaxial with pressure rod 2, is evenly heated by heating tube 41 to rock sample 5, reaches the original locating High-geotemperature probing area of rock sample 5
Domain temperature T, to simulate High-geotemperature environment, electric heater unit 4 can be replaced according to the size of rock sample 5；First extensometer 9
It is mounted on rock sample 5, the first extensometer 9 is used to acquire the axial strain data of rock sample 5, and the first extensometer 9 can the resistance to height of long-time
500 degrees Celsius of temperature, it is reusable, it is preferred that the model 3549-025M-010 of the first extensometer 91-ST；Described second draws
It stretches meter 10 to be mounted on rock sample 5, the second extensometer 10 is used to acquire the radial strain data of rock sample 5, and the second extensometer 10 can be grown
It is 500 degrees Celsius of time high temperature resistant, reusable, it is preferred that the model 3580-025M-010 of the second extensometer 101-ST；
The client 7 is for acquiring and handling the first extensometer 95 axial strain data of rock sample collected, 10 institute of the second extensometer
5 radial strain data of rock sample, 5 temperature data of rock sample collected of temperature sensor 11 and the pressure sensor of acquisition, which acquire, to be added
The application pressure data of compression bar 2, while client 7 is used to control the heating power of electric heater unit 4, to control rock sample 5
Temperature, client 7 drive pressure rod 2 with certain speed (displacement control mode) or with certain speed for controlling hydraulic cylinder 12
The power of growth (force control mode is loaded)；The probe of the temperature sensor 11 is arranged on the side wall of rock sample 5, utilizes electricity
When heating device 4 heats rock sample 5, the real time temperature of rock sample 5 is detected using temperature sensor 11, and will be warm by conducting wire
Degree by client 7 controls electric heater unit 4 to make rock sample 5 be heated to its rock sample 5 original according to being transmitted to client 7
Locating High-geotemperature drills regional temperature T, and temperature sensor 11 is silicon dioxide insulator thermocouple, can long-time high temperature resistant 500 take the photograph
Family name's degree, it is reusable.
Included the following steps: using the method that the geostress survey device of above-mentioned consideration temperature effect carries out geostress survey
Step 1: selected survey area drills through rock core in predetermined High-geotemperature drilling depth, by platinum resistance pop one's head in test or
It is calculated to obtain rock temperature T at the taken drilling depth of rock sample 5 according to ground temperature gradiometer；Using drilling machine in the rock core inner part drilling fetched
Taking six roots of sensation diameter is the rock sample 5 of core diameter 1/2, and referring to fig. 4, from left to right the axis of first rock sample 5 and rock core axially hang down
Directly, second rock sample 5 and rock core are coaxial, and rock core position is set as rock core when will drill through first rock sample 5 and second rock sample 5
Initial position, on the basis of initial position by rock core around its axis both clockwise be rotated by 90 ° after drill through third root rock sample 5, third root
The axis and rock core axis of rock sample 5 are bored rock core on the basis of initial position at 45 degree after 135 degree of the rotation of its axis both clockwise
The 4th rock sample 5 is taken, the axis and rock core axis of the 4th rock sample 5 are at 45 degree, by rock core around its axis on the basis of initial position
Line drills through the 5th rock sample 5 after rotating clockwise 180 degree, and the axis and rock core axis of the 5th rock sample 5 are at 45 degree, with initial bit
It is set to benchmark and rock core is drilled through into six roots of sensation rock sample 5, the axis and rock of six roots of sensation rock sample 5 after 270 degree of the rotation of its axis both clockwise
Mandrel line makes marks obtained six roots of sensation rock sample 5 according to direction at 45 degree, spare；
Step 2: any one rock sample 5 carries out detecting earth stress in selecting step 1, before heating to rock sample 5, surveys first
The diameter of rock sample 5 is measured, and measurement result is inputted into client 7, obtains the cross-sectional area of rock sample 5, then by temperature sensor 11
Probe is arranged on the side wall of rock sample 5, and finally the first extensometer 9 and the second extensometer 10 are mounted on rock sample 5；
Step 3: it is placed on obtained rock sample 5 is handled through step 2 in electric heater unit 4, rock sample 5 and pressure rod 2 are coaxial,
Client 7 sends heating signal to electric heater unit 4, and electric heater unit 4 receives heating signal and heats to rock sample 5, together
When 5 temperature of rock sample that acquires it in real time of temperature sensor 11 send client 7 to, 5 temperature of rock sample reaches acquired in step 1
At drilling depth when rock temperature T, the temperature is maintained 10 minutes；
Step 4: after the completion of heating, client 7 sends enabling signal to hydraulic power station 8, and letter is opened in the reception of hydraulic power station 8
Number and start, the hydraulic oil in hydraulic power station 8 enters in hydraulic cylinder 12 through high-pressure oil pipe 6, and the piston rod of hydraulic cylinder 12 pushes
Pressure rod 2 carries out uniaxial compression load to rock sample 5, and passes through the real-time of the acquisition pressure rod 2 during loading in real time of client 7
Press data, the axial strain data collected of the first extensometer 9 and the radial strain data collected of the second extensometer 10, and
Make ratio by the stress data of acquisition and the cross-sectional area for the rock sample 5 being obtained ahead of time, obtains stress data to get to first group of axis
To stress-strain data and first group of radial stress-strain data；
Step 5: repeating step 4 and obtain second group of axial stress-strain data and second group of radial stress-strain data；
Step 6: by client 7 that second group of axial stress-strain data are axial with first group after load test
Axial strain data corresponding to same axial stress σ subtract each other to obtain axial strain difference Δ ε and data point in stress-strain data
σ, Δ ε draw axial stress-strain difference data curve according to the data point σ of acquisition, Δ ε, and referring to Figure 5, wherein Δ ε is full
The following relational expression of foot:
Δ ε=ε2(σ)-ε1(σ)=ε2 T(σ)+ε2 UT(σ)-(ε1 T(σ)+ε1 UT(σ))
ε1(σ) is axial strain data corresponding to axial stress σ, ε in load for the first time1 T(σ) is in load for the first time
Temperature strain data, ε corresponding to axial stress σ1 UT(σ) is non-temperature strain corresponding to axial stress σ in load for the first time
Data, ε2(σ) is strain data corresponding to axial stress σ, ε in second of load2 T(σ) is axial stress in second of load
Temperature strain data, ε corresponding to σ2 UT(σ) is non-temperature strain data corresponding to axial stress σ in second of load, by
Identical in temperature twice, therefore, temperature strain is directly offset twice；
Step 7: repeating step 6 and obtain radial stress-strain differential data and curves；
Step 8: referring to shown in Fig. 6, at the slope mutation of radial stress described in step 7-strain differential data and curves
Corresponding radial stress data are as Reference Stress data, by axial stress-strain difference data slope of a curve described in step 6
The corresponding axial stress data in mutation place are as proof stress data；
When the difference between proof stress data and Reference Stress data is less than 5%, taking the proof stress data is to consider
Crustal stress under temperature effect；
When the difference between proof stress data and Reference Stress data is more than or equal to 5%, repetition step 1~step 7 is right
Rock sample 5 re-starts test, until the difference between proof stress data and Reference Stress data takes the test to answer less than 5%
Force data is the crustal stress considered under temperature effect.
Step 9: closing electric heater unit 4 and taken after the geostress survey device and rock sample 5 of considered temperature effect are cooling
The following group test is continued in rock sample 5 out, to the end of six roots of sensation rock sample 5 all test, gained is taken to consider that the crustal stress under temperature effect is maximum
Rock sample 5 corresponding to crustal stress under consideration temperature effect be principal stress, corresponding rock sample 5 is oriented to principal direction of stress, In
Hydraulic fracturing orientation during later period drilling operation is determined according to the principal direction of stress, has ensured productivity effect most
Bigization.
Embodiment 1
In the region for dry-hot-rock geothermal exploitation of certain delineation, through detecting, geothermal gradient is 4.5 °/100m, works as probing
It when to 4000 meters, needs to measure crustal stress, be oriented for hydraulic fracturing, i.e., it needs to be determined that principal direction of stress.Based on drilling depth
Compared with deep, the higher feature of ground temperature, detecting earth stress is carried out using the DRA method for considering temperature effect.
1, according to survey area geothermal gradient and drilling depth, predict that rock temperature is 180 ° at institute's drilling depth；
2, the rock sample 5 that six roots of sensation diameter is core diameter 1/2 is drilled through inside the rock core fetched using drilling machine, referring to fig. 4,
From left to right the axis of first rock sample 5 and rock core are axially vertical, and second rock sample 5 and rock core are coaxial, will drill through first rock
Rock core position is set as rock core initial position when sample 5 and second rock sample 5, by rock core around its axis on the basis of initial position
Third root rock sample 5 is drilled through after rotating clockwise 90 degree, the axis and rock core axis of third root rock sample 5 are at 45 degree, with initial position
On the basis of by rock core around its axis both clockwise rotate 135 degree after drill through the 4th rock sample 5, the axis and rock core of the 4th rock sample 5
Rock core is drilled through the 5th rock sample 5 after its axis both clockwise rotation 180 degree on the basis of initial position at 45 degree by axis, the
Rock core is rotated 270 degree around its axis both clockwise on the basis of initial position at 45 degree by the axis and rock core axis of five rock samples 5
After drill through six roots of sensation rock sample 5, the axis and rock core axis of six roots of sensation rock sample 5 are at 45 degree, by obtained six roots of sensation rock sample 5 according to direction
It makes marks, obtained rock sample 5 is machined to test requirements document later；
3, the first extensometer 9, the second extensometer 10 and temperature sensor 11 are mounted on rock sample 5；
4, according to the electric heater unit 4 of 5 size selection correspondingly-sized of rock sample, rock sample 5 is placed in heating device 4, is made
It obtains rock sample 5 and pressure rod 2 is coaxial；
5, electric heater unit 4 is opened, according to the 11 collected temperature of institute of temperature sensor, rock sample 5 is heated to setting temperature
180 ° of degree；
6, when the temperature of rock sample 5 reaches temperature 180, the temperature is maintained 10 minutes, so that opening after 5 entirety of rock sample is heated
Hydraulic power station 8 is opened, hydraulic oil is delivered to hydraulic cylinder 12 through high-pressure oil pipe 6, and hydraulic cylinder 12 drives 2 downlink of pressure rod to implement to add
It carries, loading speed 0.14mm/min；
7, uniaxial compression measurement load twice in succession is carried out to rock sample 5, obtains two groups of axial stress-strain data and two groups
Radial stress-strain data, respectively first group of axial stress-strain data, second group of axial stress-strain data, first
Group radial stress-strain data, second group of radial stress-strain data, wherein the peak stress loaded twice is according to actual apertures
Deep feeling condition is selected as 60MPa；
8, after load test, second group of axial stress-strain data is axially answered with first group by client 7
Axial strain data corresponding to same axial stress σ subtract each other to obtain axial strain difference Δ ε and data point in power-strain data
(σ, Δ ε) draws axial stress-strain difference data curve according to the data point (σ, Δ ε) of acquisition, and wherein Δ ε meets such as ShiShimonoseki
It is formula:
Δ ε=ε2(σ)-ε1(σ)=ε2 T(σ)+ε2 UT(σ)-(ε1 T(σ)+ε1 UT(σ))
ε1(σ) is axial strain data corresponding to axial stress σ, ε in load for the first time1 T(σ) is in load for the first time
Temperature strain data, ε corresponding to axial stress σ1 UT(σ) is non-temperature strain corresponding to axial stress σ in load for the first time
Data, ε2(σ) is strain data corresponding to axial stress σ, ε in second of load2 T(σ) is axial stress in second of load
Temperature strain data, ε corresponding to σ2 UT(σ) is non-temperature strain data corresponding to axial stress σ in second of load, by
Identical in temperature twice, therefore, temperature strain is directly offset twice；
Radial stress-strain differential data and curves can similarly be obtained；
Using the corresponding radial stress data in the radial stress-strain differential data and curves slope mutation place as
Reference Stress data, by the corresponding axial stress number in axial stress-strain difference data slope of a curve mutation place
According to as proof stress data；
When the difference between proof stress data and Reference Stress data is less than 5%, taking the proof stress data is to consider
Crustal stress under temperature effect；
When the difference between proof stress data and Reference Stress data be more than or equal to 5%, examination is re-started to rock sample 5
It tests, until the difference between proof stress data and Reference Stress data less than 5%, takes the proof stress data to consider temperature
Crustal stress under effect；
9, it closes electric heater unit 4 and takes out rock after the geostress survey device and rock sample 5 of considered temperature effect are cooling
Sample 5 continues the following group test, to the end of six roots of sensation rock sample 5 all test, gained is taken to consider the maximum rock of crustal stress under temperature effect
Crustal stress under consideration temperature effect corresponding to sample 5 is principal stress, hydraulic fracturing orientation during later period drilling operation
It is determined according to the principal direction of stress, has ensured the maximization of productivity effect.
The above, the only preferred embodiment of the utility model, are not intended to limit the utility model, the utility model
Scope of patent protection be subject to claims, all specifications and accompanying drawing content with the utility model are done same
Structure change similarly should be included in the protection scope of the utility model.
Claims (7)
1. a kind of geostress survey device for considering temperature effect characterized by comprising rack (1), pressure rod (2), electricity add
Thermal (4), high-pressure oil pipe (6), client (7), hydraulic power station (8), the first extensometer (9), the second extensometer (10), temperature
Degree sensor (11) and hydraulic cylinder (12), the hydraulic cylinder (12) are mounted on the lower center position of rack (1), hydraulic cylinder (12)
It is connect by high-pressure oil pipe (6) with hydraulic power station (8), the piston rod of hydraulic cylinder (12) is connect with pressure rod (2) top；It is described
The lower part of pressure rod (2) is provided with pressure sensor；The client (7) by conducting wire respectively with electric heater unit (4), hydraulic
Power station (8), the first extensometer (9), the second extensometer (10), temperature sensor (11), hydraulic cylinder (12) and setting are being pressurizeed
Pressure sensor connection on bar (2)；The electric heater unit (4) is used to heat the rock sample (5) placed inside it；First
Extensometer (9) is mounted on rock sample (5), and the first extensometer (9) is used to acquire the axial strain data of rock sample (5)；Described second
Extensometer (10) is mounted on rock sample (5), and the second extensometer (10) is used to acquire the radial strain data of rock sample (5), and temperature passes
The probe of sensor (11) is arranged on the side wall of rock sample (5), and temperature sensor (11) is for acquiring rock sample (5) temperature.
2. considering the geostress survey device of temperature effect according to claim 1, which is characterized in that the measuring device is also wrapped
It includes support rod (3), support rod (3) is used for fixed frame (1).
3. considering the geostress survey device of temperature effect according to claim 1, which is characterized in that the pressure rod (2)
Outside is equipped with thermally insulating housing.
4. considering the geostress survey device of temperature effect according to claim 1, which is characterized in that the electric heater unit
(4) it is made of heating tube (41), attemperator (42) and Heat-insulation device (43), attemperator (42) and Heat-insulation device (43) surround
The hollow cylindrical structure of open top, heating tube (41) is coaxial with the hollow cylindrical structure and the side wall that sets within it
On, heating tube (41) is twist arranged.
5. considering the geostress survey device of temperature effect according to claim 1, which is characterized in that first extensometer
It (9) is model 3549-025M-0101- ST extensometer.
6. considering the geostress survey device of temperature effect according to claim 1, which is characterized in that second extensometer
It (10) is model 3580-025M-0101- ST extensometer.
7. considering the geostress survey device of temperature effect according to claim 1, which is characterized in that the temperature sensor
It (11) is silicon dioxide insulator thermocouple.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109781509A (en) * | 2019-03-14 | 2019-05-21 | 吉林大学 | A kind of geostress survey device and measurement method considering temperature effect |
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2019
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109781509A (en) * | 2019-03-14 | 2019-05-21 | 吉林大学 | A kind of geostress survey device and measurement method considering temperature effect |
| CN109781509B (en) * | 2019-03-14 | 2023-11-03 | 吉林大学 | Ground stress measuring device and method considering temperature effect |
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