CN111707602A - Intelligent environment box for carrying out rock-soil body hydrothermal circulation test - Google Patents
Intelligent environment box for carrying out rock-soil body hydrothermal circulation test Download PDFInfo
- Publication number
- CN111707602A CN111707602A CN202010590240.7A CN202010590240A CN111707602A CN 111707602 A CN111707602 A CN 111707602A CN 202010590240 A CN202010590240 A CN 202010590240A CN 111707602 A CN111707602 A CN 111707602A
- Authority
- CN
- China
- Prior art keywords
- box body
- box
- cold
- rock
- hot
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000002689 soil Substances 0.000 title claims abstract description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 31
- 239000011435 rock Substances 0.000 claims abstract description 18
- 238000001035 drying Methods 0.000 claims description 12
- 239000004065 semiconductor Substances 0.000 claims description 12
- 239000002184 metal Substances 0.000 claims description 10
- 239000007788 liquid Substances 0.000 claims description 6
- 238000012544 monitoring process Methods 0.000 claims description 6
- 239000011521 glass Substances 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 3
- 230000007613 environmental effect Effects 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 230000001276 controlling effect Effects 0.000 description 5
- 230000008595 infiltration Effects 0.000 description 5
- 238000001764 infiltration Methods 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002372 labelling Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
- G01N17/002—Test chambers
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/24—Earth materials
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical & Material Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- Pathology (AREA)
- General Physics & Mathematics (AREA)
- Environmental Sciences (AREA)
- Biodiversity & Conservation Biology (AREA)
- Ecology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Remote Sensing (AREA)
- Food Science & Technology (AREA)
- Medicinal Chemistry (AREA)
- Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
Abstract
The invention discloses an intelligent environment box for carrying out a rock-soil body hydrothermal circulation test, which comprises a box body and a box cover, and also comprises an electric three-way valve, an exhaust fan, a cold-hot controller, a water level sensor, a temperature sensor, a data acquisition device and a system control device; a grid plate is horizontally arranged in the box body, the grid plate divides the inner space of the box body into an upper first box body area and a lower second box body area, a temperature sensor is arranged in the first box body area, a water level sensor is arranged in the second box body area, an electric three-way valve is arranged at the bottom of the box body, and an exhaust fan and a cold and heat controller are arranged in the outer wall of the non-bottom surface of the box body or in the box cover; the temperature sensor and the water level sensor are connected with the data acquisition device, and the data acquisition device, the electric three-way valve, the cold and hot controller and the exhaust fan are connected with the system control device. The environment box can perform dry-wet circulation and/or cold-hot circulation, realizes automatic control of circulation conditions, and better simulates the influence of rock and soil mass in natural environment.
Description
Technical Field
The invention relates to the technical field of rock and soil mass hydrothermal circulation test equipment, in particular to an intelligent environment box for performing a rock and soil mass hydrothermal circulation test.
Background
In nature, due to precipitation, day and night and season alternation, artificial activities and other factors, rock and soil mass is often in circulation under different hydrothermal conditions. The change of the hydrothermal condition can change the physical and chemical properties, the structure and the strength of rock-soil mass, and further influence the stability of embankment cutting, channel side slope, open pit and the like. Therefore, in engineering construction, it is very important to study the influence of hydrothermal circulation on the physicochemical properties, structure and strength of rock-soil mass.
At present, in a laboratory, a dry-wet cycle test and a cold-hot cycle test respectively provide different test environments in different devices, manually control the cycle period, the cycle frequency and other test conditions, and have a plurality of defects when performing a rock-soil body hydrothermal cycle test: 1. when the dry-wet cycle test and the cold-hot cycle test are carried out independently, most devices cannot accurately control other environmental factors, for example, the temperature of the environment where a sample is located cannot be controlled by the dry-wet cycle test adopting a drying method; 2. the dry-wet cycle and the cold-hot cycle need to be realized independently in separate test devices, and each cycle test needs an independent device; 3. the hydrothermal circulation test device needs to manually adjust test conditions, and automation of the test process cannot be realized.
Disclosure of Invention
The invention aims to provide an intelligent environment box for performing a rock-soil body hydrothermal circulation test, which aims at the existing technical situation, can perform dry-wet circulation and/or cold-hot circulation, realizes automatic control of circulation conditions, and better simulates the influence of a rock-soil body in a natural environment.
In order to achieve the purpose, the invention adopts the following technical scheme:
an intelligent environment box for performing a rock-soil body hydrothermal circulation test comprises a box body with an open upper end, a box cover for covering the open upper end of the box body, an electric three-way valve for controlling liquid level in the box body, an exhaust fan for controlling drying degree in the box body, a cold-hot controller for controlling cold-hot degree in the box body, a water level sensor for monitoring liquid level in the box body, a temperature sensor for monitoring temperature in the box body, a data acquisition device and a system control device;
a grid plate is horizontally arranged in the box body and used for placing rock and soil samples, the grid plate divides the inner space of the box body into an upper first box body area and a lower second box body area, the temperature sensor is arranged in the first box body area, the water level sensor is arranged in the second box body area, the electric three-way valve is arranged at the bottom of the box body and communicated with the interior of the box body, and the exhaust fan and the cold and hot controller are arranged in the outer wall of the non-bottom surface of the box body and the installation height of the exhaust fan and the cold and hot controller is greater than the height of the grid plate or the height of the box cover;
the temperature sensor and the water level sensor are connected with a data acquisition device, and the data acquisition device, the electric three-way valve, the cold and hot controller and the exhaust fan are connected with a system control device.
Furthermore, the cold and hot controller is a semiconductor cold and hot controller, and the semiconductor cold and hot controller comprises a radiating fin, a semiconductor fin and a heat conducting fan which are sequentially stacked.
Furthermore, the width of the box cover is larger than the outer width of the opening at the upper end of the box body.
Furthermore, the lower end face of the box cover is provided with a protruding structure to enable the box cover to be T-shaped, and the width of the protruding structure is not larger than the inner width of an opening at the upper end of the box body.
Furthermore, the box body and the box cover are both made of transparent organic glass.
Furthermore, the device also comprises a metal bracket, and the box body is arranged on the metal bracket.
Furthermore, the system control device and the data acquisition device are both arranged on the metal bracket.
Furthermore, the system control device is a microcomputer with a display interface and input keys.
The invention has the beneficial effects that:
compared with the prior art, the intelligent environment box for performing the rock-soil body hydrothermal circulation test can perform dry-wet circulation, cold-hot circulation or the two circulation tests simultaneously according to different requirements of the test; the automatic control of cycle conditions such as cycle time, cycle times and the like is realized, and the efficiency of a hydrothermal cycle test is obviously improved; the influence of temperature and rainfall conditions on the rock-soil body in a natural environment is better simulated, so that the test result has higher reference value for solving the actual engineering problem.
Drawings
FIG. 1 is a schematic diagram of the structure of the environmental chamber of the present invention.
Description of the labeling: 1. the device comprises a box body, 2, a metal support, 3, a box cover, 4, a rock soil sample, 5, an exhaust fan, 6, a temperature sensor, 7, a water level sensor, 8, a grid plate, 9, an electric three-way valve, 10, a radiating fin, 11, a semiconductor wafer, 12, a heat conduction fan, 13 and a microcomputer.
Detailed Description
The invention will be further explained with reference to the drawings.
Referring to fig. 1, an intelligent environmental chamber for performing a rock-soil body hydrothermal circulation test includes a chamber body 1 with an open top and a chamber cover 3 covering the chamber body 1 with an open top, wherein the chamber body 1 is not completely sealed after the chamber cover 3 covers the chamber body 1. The box body 1 and the box cover 3 are both made of transparent organic glass, and the test condition in the box body 1 can be visually observed conveniently. The width of case lid 3 is greater than the open outer width in 1 upper end of box, 3 lower terminal surfaces of case lid have protruding structure and make it be the T type, the width of protruding structure is not more than the open interior width in 1 upper end of box. The structural design of the box cover 3 facilitates the taking and placing of the box cover 3, and meanwhile, the box cover 3 is not easy to slip after covering the box body 1.
Among the above-mentioned technical scheme, still including the electric three-way valve 9 that is used for controlling the interior liquid level of box 1 for the exhaust fan 5 of the interior drying degree of control box 1, the cold and hot controller for controlling the cold and hot degree of box 1, the level sensor 7 for monitoring the interior liquid level of box 1, the temperature sensor 6 for monitoring the interior temperature of box 1, and data acquisition device and system control device. The cold and hot controller is semiconductor cold and hot controller, and semiconductor cold and hot controller is including fin 10, semiconductor fin 11 and the heat conduction fan 12 that superpose the setting in proper order, controls the current direction of input semiconductor fin 11, makes semiconductor cold and hot controller both can release heat to the environment, also can follow the heat absorption in the environment. The data acquisition device can acquire data and process the data to a certain degree. The system control device is a microcomputer 13 with a display interface and input keys, which may also be a conventional computer.
In the above technical scheme, the device further comprises a metal support 2, and the box body 1 is arranged on the metal support 2. The system control device and the data acquisition device are both arranged on the metal bracket 2. Through metal support 2 installation box 1 and system control device, data acquisition device, make test equipment integrate, also do benefit to simultaneously and arrange accessories such as electronic three-way valve 9.
The rock soil sample storage box is characterized in that a grid plate 8 is horizontally arranged in the box body 1, the grid plate 8 is used for placing rock soil samples 4, the internal space of the box body 1 is divided into an upper first box body area and a lower second box body area by the grid plate 8, the temperature sensor 6 is arranged in the first box body area, and the water level sensor 7 is arranged in the second box body area. Electric three-way valve 9 sets up in 1 bottom of box and with the inside intercommunication of box 1, and electric three-way valve 9 has inlet valve and outlet valve, exhaust fan 5 sets up in 1 lateral wall of box and the height that mounting height all is greater than grid 8, cold and hot controller sets up in case lid 3.
The temperature sensor 6 and the water level sensor 7 are connected with a data acquisition device, and the data acquisition device, the electric three-way valve 9, the cold and hot controller and the exhaust fan 5 are connected with a system control device. The water level sensor 7 monitors corresponding water level change in the box body 1 and converts water level parameters into corresponding electric quantity signals in real time, the electric quantity signals are collected by the data collecting device and then transmitted to the system control device, and the system control device controls the electric three-way valve 9 to feed and discharge water, so that automatic control of the water level is achieved. The temperature sensor 6 monitors the temperature signal in the box body 1 and converts the temperature signal into an electric quantity signal, the electric quantity signal is transmitted to the system control device after being collected by the data collecting device, and the system control device controls the cold-heat controller to heat or refrigerate, so that the temperature in the box body 1 is kept as a test set value.
Specifically, the process of performing the cold-hot cycle test through the environmental chamber is as follows:
before the test, conditions such as a cycle period, a cycle number, a high temperature threshold, a low temperature threshold, and the like are set in a system control device. The primary cold-hot cycle test is divided into a high-temperature stage and a low-temperature stage, and the cycle period comprises high-temperature duration and low-temperature duration. The rock soil sample 4 is laid on the grid plate 8.
In the high-temperature stage, when the temperature sensor 6 monitors that the temperature in the environment box is lower than the set high-temperature threshold, the system control device sends an instruction to enable the cold and hot controller to release heat into the environment box, the temperature in the environment box starts to rise, the cold and hot controller stops working after the set high-temperature threshold is reached, the high-temperature stage is ended after the high-temperature duration is reached, and the low-temperature stage is started.
And in the low-temperature stage, the system control device sends out an instruction to enable the cold and hot controller to absorb heat from the environment box, the temperature in the environment box starts to be reduced, when the set low-temperature threshold is reached, the cold and hot controller stops working, and after the low-temperature duration is reached, a cold and hot circulation test is finished.
And repeating the circulation until the cycle number is reached and then completing the cold-hot circulation test.
Specifically, the process of performing the dry-wet cycle test through the environmental chamber is as follows:
before the test, conditions such as a cycle period and the number of times, a water level threshold value, and an ambient temperature required for the test are set in the system control device. The primary dry-wet cycle process is divided into an infiltration stage and a drying stage, and the cycle period comprises infiltration duration and drying duration. The rock soil sample 4 is laid on the grid plate 8.
And in the infiltration stage, when the water level sensor 7 monitors that the water level in the environment tank is lower than a set water level threshold, the system control device sends an instruction to open the water inlet valve of the electric three-way valve 9, the water level in the environment tank gradually rises, when the water level reaches the set water level threshold, the water inlet valve of the electric three-way valve 9 is closed, and after the infiltration duration is reached, the infiltration stage is ended, and the drying stage is started.
In the drying stage, the system control device sends an instruction to open the water outlet valve of the electric three-way valve 9, the water level in the environment tank is gradually reduced, and when the water level sensor 7 monitors that the water level in the environment tank is zero, the water outlet valve of the electric three-way valve 9 is closed. After the drying stage, the exhaust fan 5 starts to work, and after the drying time is reached, the drying stage is finished, and the one-time dry-wet cycle test is finished.
And repeating the circulation until the dry-wet circulation test is finished after the circulation times are reached.
And the environmental temperature in the environmental box is regulated by the temperature sensor 6 and the cold-hot controller in the dry-wet cycle test process.
The environment box can carry out dry-wet circulation, cold-hot circulation or the two circulation tests at the same time according to different requirements of the tests; the automatic control of cycle conditions such as cycle time, cycle times and the like is realized, and the efficiency of a hydrothermal cycle test is obviously improved; the influence of temperature and rainfall conditions on the rock-soil body in the natural environment is better simulated, so that the test result has more reference value for solving the practical engineering problem
It should be understood that the above-mentioned embodiments are merely preferred embodiments of the present invention, and not intended to limit the scope of the invention, therefore, all equivalent changes in the principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The utility model provides a carry out experimental intelligent environment case of ground body hydrothermal circulation, includes that the upper end is open box and covers the open case lid in box upper end, its characterized in that: the drying device also comprises an electric three-way valve for controlling the liquid level in the box body, an exhaust fan for controlling the drying degree in the box body, a cold and hot controller for controlling the cold and hot degree in the box body, a water level sensor for monitoring the liquid level in the box body, a temperature sensor for monitoring the temperature in the box body, a data acquisition device and a system control device;
a grid plate is horizontally arranged in the box body and used for placing rock and soil samples, the grid plate divides the inner space of the box body into an upper first box body area and a lower second box body area, the temperature sensor is arranged in the first box body area, the water level sensor is arranged in the second box body area, the electric three-way valve is arranged at the bottom of the box body and communicated with the interior of the box body, and the exhaust fan and the cold and hot controller are arranged in the outer wall of the non-bottom surface of the box body and the installation height of the exhaust fan and the cold and hot controller is greater than the height of the grid plate or the height of the box cover;
the temperature sensor and the water level sensor are connected with a data acquisition device, and the data acquisition device, the electric three-way valve, the cold and hot controller and the exhaust fan are connected with a system control device.
2. The intelligent environment box for performing the hydro-thermal cycle test of rock and soil mass according to claim 1, wherein: the cold and hot controller of cold and hot controller is the cold and hot controller of semiconductor, and the cold and hot controller of semiconductor is including the fin, semiconductor fin and the heat conduction fan that stack in proper order set up.
3. The intelligent environment box for performing the hydro-thermal cycle test of rock and soil mass according to claim 1, wherein: the width of the box cover is larger than the outer width of the upper end opening of the box body.
4. The intelligent environment box for performing the hydro-thermal cycle test of rock and soil mass according to claim 3, wherein: the lower end face of the box cover is provided with a protruding structure to enable the box cover to be T-shaped, and the width of the protruding structure is not larger than the inner width of an opening at the upper end of the box body.
5. The intelligent environment box for performing the hydro-thermal cycle test of rock and soil mass according to claim 1, wherein: the box body and the box cover are both made of transparent organic glass.
6. The intelligent environment box for performing the hydro-thermal cycle test of rock and soil mass according to claim 1 or 5, wherein: the box body is arranged on the metal bracket.
7. The intelligent environment box for performing the hydro-thermal cycle test of rock and soil mass according to claim 6, wherein: the system control device and the data acquisition device are both arranged on the metal bracket.
8. The intelligent environment box for performing the hydro-thermal cycle test of rock and soil mass according to claim 7, wherein: the system control device is a microcomputer with a display interface and input keys.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010590240.7A CN111707602B (en) | 2020-06-24 | 2020-06-24 | Intelligent environment box for rock-soil body hydrothermal circulation test |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010590240.7A CN111707602B (en) | 2020-06-24 | 2020-06-24 | Intelligent environment box for rock-soil body hydrothermal circulation test |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111707602A true CN111707602A (en) | 2020-09-25 |
| CN111707602B CN111707602B (en) | 2024-10-11 |
Family
ID=72543469
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010590240.7A Active CN111707602B (en) | 2020-06-24 | 2020-06-24 | Intelligent environment box for rock-soil body hydrothermal circulation test |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111707602B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113533181A (en) * | 2021-07-06 | 2021-10-22 | 英利能源（中国）有限公司 | Design test method and device for photovoltaic module in seawater environment |
| CN113686541A (en) * | 2021-09-10 | 2021-11-23 | 中国科学院武汉岩土力学研究所 | Water jet module experimental device and method |
| US11408816B2 (en) * | 2019-03-28 | 2022-08-09 | Qingdao university of technology | Device and method for dry-wet cycle simulation test of concrete in tidal zone and splash zone |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6125685A (en) * | 1997-09-30 | 2000-10-03 | The Board Of Trustees Of The University Of Arkansas | Apparatus and method for the evaluation of asphalt mixes |
| WO2014066844A2 (en) * | 2012-10-26 | 2014-05-01 | GreenTech Agro LLC | Self-sustaining artificially controllable environment within a storage container or other enclosed space |
| CN104914035A (en) * | 2015-06-02 | 2015-09-16 | 三峡大学 | Separated type full-automatic spraying drying and watering cycle testing device |
| CN212301254U (en) * | 2020-06-24 | 2021-01-05 | 中国地质大学（武汉） | Intelligent environment box for carrying out rock-soil body hydrothermal circulation test |
-
2020
- 2020-06-24 CN CN202010590240.7A patent/CN111707602B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6125685A (en) * | 1997-09-30 | 2000-10-03 | The Board Of Trustees Of The University Of Arkansas | Apparatus and method for the evaluation of asphalt mixes |
| WO2014066844A2 (en) * | 2012-10-26 | 2014-05-01 | GreenTech Agro LLC | Self-sustaining artificially controllable environment within a storage container or other enclosed space |
| CN104914035A (en) * | 2015-06-02 | 2015-09-16 | 三峡大学 | Separated type full-automatic spraying drying and watering cycle testing device |
| CN212301254U (en) * | 2020-06-24 | 2021-01-05 | 中国地质大学（武汉） | Intelligent environment box for carrying out rock-soil body hydrothermal circulation test |
Non-Patent Citations (1)
| Title |
|---|
| 孙国亮;孙逊;张丙印;: "堆石料风化试验仪的研制及应用", 岩土工程学报, no. 09, 15 September 2009 (2009-09-15) * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11408816B2 (en) * | 2019-03-28 | 2022-08-09 | Qingdao university of technology | Device and method for dry-wet cycle simulation test of concrete in tidal zone and splash zone |
| CN113533181A (en) * | 2021-07-06 | 2021-10-22 | 英利能源（中国）有限公司 | Design test method and device for photovoltaic module in seawater environment |
| CN113686541A (en) * | 2021-09-10 | 2021-11-23 | 中国科学院武汉岩土力学研究所 | Water jet module experimental device and method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111707602B (en) | 2024-10-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111707602A (en) | Intelligent environment box for carrying out rock-soil body hydrothermal circulation test | |
| CN212301254U (en) | Intelligent environment box for carrying out rock-soil body hydrothermal circulation test | |
| CN201096707Y (en) | Soil erosion simulation acceleration testing box | |
| Teleszewski et al. | Analysis of heat loss of a biogas anaerobic digester in weather conditions in Poland | |
| CN205374438U (en) | Deformation test device of salinized soil road bed under dry -wet cycle effect | |
| CN103823040B (en) | A kind of soil body of simulating is by the device of extreme climate effect and the method using this device to test | |
| CN102435717A (en) | Soil frost-heaving and thawing-settlement tester based on thermoelectric refrigeration control | |
| CN108732057A (en) | Ring shear test equipment and its test method under a kind of soil body Frozen-thawed cycled and weathering environment | |
| CN113588912B (en) | Simulation system and method for simulating frozen soil environment on site | |
| CN106370816A (en) | Testing system capable of dynamically testing soil dehumidification/freezing water content change features | |
| CN103913544A (en) | Melts and coolant interacting relative thermal-hydraulic research experiment water tank | |
| CN202216953U (en) | Soil frost heaving thaw settlement test instrument based on thermoelectric refrigeration control | |
| CN111208266A (en) | Test device for simulating pollutant migration and transformation in water icing and ablation processes | |
| CN113884654B (en) | Simulation method for sandy soil spraying and desertification control slurry simulation device | |
| CN212904235U (en) | Geomembrane tensile test device | |
| CN102749434A (en) | Indenter for indoor freeze thawing test | |
| CN113048664A (en) | Solar water heater efficiency test system and method | |
| CN210182525U (en) | Liquid full-immersion type lithium battery thermal management experiment platform | |
| CN203011871U (en) | Testing device for heat insulation temperature difference of reflective insulation coating | |
| CN101785404A (en) | Root system temperature regulating device | |
| CN108332999B (en) | Dew measuring device and dew measuring method | |
| CN101587116B (en) | Large-scale low-temperature geotechnical simulation test system | |
| CN217845916U (en) | Roadbed soil performance test device capable of realizing multi-working-condition coupling | |
| CN109521502A (en) | A kind of automatic rainfall monitoring record and rainwater sampling system and its application method | |
| CN210834900U (en) | Aeration zone water heat monitoring device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant |