CN115754152A - Experimental system for simulating hydrate decomposition triggering seabed slope damage and using method - Google Patents
Experimental system for simulating hydrate decomposition triggering seabed slope damage and using method Download PDFInfo
- Publication number
- CN115754152A CN115754152A CN202211452846.XA CN202211452846A CN115754152A CN 115754152 A CN115754152 A CN 115754152A CN 202211452846 A CN202211452846 A CN 202211452846A CN 115754152 A CN115754152 A CN 115754152A
- Authority
- CN
- China
- Prior art keywords
- temperature
- slope
- hydrate
- soil
- experimental
- 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.)
- Pending
Links
- 238000000354 decomposition reaction Methods 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 33
- 230000006378 damage Effects 0.000 title claims abstract description 29
- 239000002689 soil Substances 0.000 claims abstract description 98
- 238000010438 heat treatment Methods 0.000 claims abstract description 35
- 239000011148 porous material Substances 0.000 claims abstract description 28
- 238000012544 monitoring process Methods 0.000 claims abstract description 18
- 238000004088 simulation Methods 0.000 claims abstract description 17
- 239000013535 sea water Substances 0.000 claims abstract description 7
- 230000000694 effects Effects 0.000 claims abstract description 5
- 239000000835 fiber Substances 0.000 claims description 27
- 238000002474 experimental method Methods 0.000 claims description 18
- 230000005540 biological transmission Effects 0.000 claims description 17
- 230000008569 process Effects 0.000 claims description 15
- 239000004927 clay Substances 0.000 claims description 12
- 230000008054 signal transmission Effects 0.000 claims description 12
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 claims description 8
- 230000008859 change Effects 0.000 claims description 5
- 238000009826 distribution Methods 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 239000013307 optical fiber Substances 0.000 claims description 4
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 claims description 4
- 239000013049 sediment Substances 0.000 claims description 3
- 238000012360 testing method Methods 0.000 claims description 3
- 230000009471 action Effects 0.000 claims description 2
- 150000004677 hydrates Chemical group 0.000 claims description 2
- 230000003313 weakening effect Effects 0.000 claims description 2
- 238000013461 design Methods 0.000 abstract description 6
- 230000009467 reduction Effects 0.000 abstract description 2
- 230000007613 environmental effect Effects 0.000 description 7
- 238000011161 development Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 239000000203 mixture Substances 0.000 description 3
- BSCHIACBONPEOB-UHFFFAOYSA-N oxolane;hydrate Chemical compound O.C1CCOC1 BSCHIACBONPEOB-UHFFFAOYSA-N 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000007596 consolidation process Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- NMJORVOYSJLJGU-UHFFFAOYSA-N methane clathrate Chemical compound C.C.C.C.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O NMJORVOYSJLJGU-UHFFFAOYSA-N 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Natural products C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- -1 natural gas hydrates Chemical class 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Images
Landscapes
- Testing Or Calibration Of Command Recording Devices (AREA)
Abstract
An experimental system for simulating hydrate decomposition triggering seabed slope damage and a using method thereof comprise an environment temperature control module, a slope damage simulation module and a parameter monitoring and acquisition module. Through the design of injecting seawater, preparing a slope model and an environment temperature control module, the slope body containing a hydrate layer is in the conditions of saturation, high pressure and low temperature, and the simulation of the submarine underwater environment can be realized; by the design of the slope damage simulation module, the heating temperature of the hydrate layer is controlled, so that the real-time temperature and pressure state of the hydrate is controlled, and controllable generation and decomposition of the hydrate can be realized; through the design of the parameter monitoring and collecting module, the evolution of internal parameters such as the increase of the super-pore pressure, the reduction of the soil pressure and the like and the external deformation characteristics of the slope are monitored in real time, and the evolution of the internal parameters of the slope and the real-time monitoring of the external deformation characteristics can be simultaneously realized. The invention has simple structure, clear function of each module, convenient assembly and implementation and obvious technical effect.
Description
Technical Field
The invention belongs to the technical field of geotechnical engineering, and relates to an experimental system for simulating hydrate decomposition to trigger seabed slope damage and a using method thereof.
Background
With the deep promotion of the strong ocean advocated by China, the energy development of China is continuously changed from land to ocean and from shallow sea to deep sea, and the ocean energy development is becoming an important component of the economic development of China. As an important clean energy source, the natural gas hydrate has the characteristics of large resource reserves, high energy density, wide distribution range, cleanness and no pollution, is regarded as a novel alternative energy source with the greatest development potential in the 21 st century, and more than 97 percent of the natural gas hydrate is distributed in marine sediments. The stability of natural gas hydrates is affected by factors such as formation temperature, pressure, gas composition, and formation chemical composition. The external environment change can cause the decomposition of hydrate, destroy the integral stability of the slope, further cause geological disasters such as instability of the submarine slope or large-scale landslide and the like, and challenge the safe continuous development of the hydrate. Therefore, the research of the catastrophe evolution mechanism of inducing the instability of the seabed slope after the hydrate decomposition is developed from the national major strategic demand has important scientific significance.
Disclosure of Invention
The invention aims to provide an experimental simulation system for triggering seabed slope destruction by hydrate decomposition. Controllable generation and decomposition of hydrates are realized in a simulated seabed underwater environment, and real-time monitoring of slope internal parameter evolution (soil displacement, super-pore pressure and the like) and external deformation characteristics is realized in an experimental process.
In order to achieve the purpose, the invention adopts the technical scheme that:
an experimental system for simulating hydrate decomposition to trigger seabed slope damage comprises an environment temperature control module, a slope damage simulation module and a parameter monitoring and acquisition module.
The environment temperature control module: comprises an environment temperature controller 7, a low temperature box 3 and an environment temperature system control line 13. The environment temperature controller 7 is connected with the low temperature box 3 through an environment temperature system control line 13 and is used for simulating the seabed low temperature environment and providing a proper hydrate generation temperature. The side wall of the low temperature box 3 is provided with a through hole for passing through a soil temperature system control line 9, and the top of the low temperature box is provided with a through hole for passing through a sensor signal transmission line 12.
The slope destruction simulation module: the device comprises an experimental model box 4, a slope bottom plate 14, a multi-layer soil slope 15, a soil temperature controller 1, a soil temperature system control line 9 and a temperature sensor 18, wherein the soil temperature system control line 9 comprises a temperature control line 19 and a heating line 20. The soil temperature controller 1 is connected with a heating wire 20, and the heating wire 20 is arranged on the upper surface of the slope bottom plate 14; the soil temperature controller 1 is connected with a temperature sensor 18 through a temperature control line 19, and the temperature control line 19 and the temperature sensor 18 are arranged on the upper surface of the slope bottom plate 14 in the same way; the connection mode between the line boards is an adhesive method. The experimental model box 4 is placed in the low-temperature box 3, is made of rigid materials, and smoothes the inner surface of the experimental model box 4 in order to reduce the influence of boundary effect; in order to realize the monitoring of the internal parameters of the slope model 15, one side of the experiment model box 4 is set to be transparent; the model base plate 14 is positioned in the experimental model box 4, forms a certain angle with the lower surface of the experimental model box 4, and can adjust the angle according to specific experimental working conditions; the temperature sensor 18, the temperature control wire 19 and the heating wire 20 are arranged on the upper surface of the slope bottom plate 14, and the specific arrangement mode is as follows: the heating wires 20 are arranged in a shape like a Chinese character 'hui', wherein a plurality of small-sized square-shaped arrangement areas are arranged at the middle inclined section of the slope bottom plate 14, and hydrate punctiform heating decomposition and area heating decomposition can be simulated according to specific working conditions; the temperature sensors 18 are arranged in a plurality of groups in the direction vertical to the transparent side surface of the model box 4, and each group is arranged at equal intervals along the inclined direction of the slope bottom plate 14, so that the heating temperature of the soil layer can be monitored in real time; the temperature control line 19 plays a role of connecting the temperature sensor 18, is arranged in a parallel state, and transmits soil layer temperature data to the soil layer temperature controller 1 so as to realize accurate closed-loop control of the soil layer temperature. The slope model 15 is arranged on a model bottom plate 14 with a temperature control circuit, and the shape and the thickness of the slope model are changed according to different experimental working conditions.
The parameter monitoring and collecting module comprises: the device comprises a high-speed camera 5, an image collector 6, a fiber grating pore pressure sensor 16, a fiber transmission line 10, a fiber grating demodulator 2, a soil stress sensor 17, a sensor signal transmission line 12, a data transmission line 11 and a computer 8. The high-speed camera 5 is arranged on the transparent side and the top of the experimental model box 4, and the high-speed camera 5 is connected to the image collector 6 through a sensor signal transmission line 12 and used for monitoring the internal deformation and the external three-dimensional shape change of the slope model 15 in the experimental process; the fiber grating pore pressure sensor 16 and the soil stress sensor 17 are embedded inside a soil layer of the slope model 15 in advance, and the specific arrangement mode is as follows: the fiber grating pore pressure sensor 16 and the soil stress sensor 17 are arranged in a hydrate layer in the slope model 15 side by side, a plurality of groups are also arranged in the direction perpendicular to the transparent side surface of the model box 4, all the groups are arranged at equal intervals along the distribution direction of the hydrate layer, a plurality of groups are embedded at equal intervals along the top of the hydrate layer to the bottom of the hydrate layer, and are respectively connected to the fiber grating demodulator 2 and the image collector 6 through the optical fiber transmission line 10 and the sensor signal transmission line 12, and the two transmission lines and the sensors are connected by adopting a series connection method and are used for the internal super-pore pressure and the soil pressure of the slope in the experimental process. The output signals of the fiber grating demodulator 2 and the image collector 6 are linked to the computer 8 through a data transmission line 11, and various data of the designed working condition are monitored and collected in real time.
A use method of an experimental system for simulating hydrate decomposition to trigger seabed slope destruction comprises the following steps:
firstly, assembling an experimental system for simulating the decomposition of the hydrate to trigger the damage of the seabed slope.
And secondly, injecting seawater into the experimental model box 4 according to experimental working conditions so as to simulate the submarine environment. After the seawater passes through the slope model 15 to the experiment setting position, the environmental temperature controller 7 is adjusted to enable the temperature in the low-temperature box 3 to be reduced to the experiment setting environmental temperature from the room temperature, in the process, the temperature sensor 18 arranged in the slope model 15 senses the real-time temperature of each position of the hydrate layer and transmits the real-time temperature to the soil layer temperature controller 1 through the temperature control line 19, and when the temperature readings displayed by the soil layer temperature controller 1 are constant, the environmental temperature of the hydrate slope model 15 is considered to reach the setting temperature, namely the environmental condition before the experiment of the hydrate decomposition process is achieved.
And thirdly, according to experimental working conditions, controlling the heating wire 20 on the slope bottom plate 14 through the soil layer temperature controller 1 to heat the hydrate layer, and monitoring real-time soil layer change temperature data input into the soil layer temperature controller 1 from the temperature sensor 18 and the temperature control wire 19. The decomposition of the hydrate is controlled by the temperature and pressure condition of the sediment of the occurrence layer, the hydrate stably exists under the action of the initial environment temperature and the soil body pressure, when the pressure of the soil body containing the hydrate is kept unchanged and the temperature is increased to be higher than the critical temperature, the hydrate is decomposed, the soil layer parameters are changed while the super pore pressure is generated, and therefore when the readings of all the positions in the soil layer temperature controller 1 reach the preset temperature of the experimental working condition, the hydrate is considered to start to decompose. Along with the continuous decomposition of the hydrate, the superporous pressure of the hydrate layer in the slope model 15 is continuously accumulated, and the soil strength has a weakening trend, so that the method can be initiated as follows: the evolution of internal parameters such as pore pressure increase measured by the fiber grating pore pressure sensor 16 and soil pressure decrease measured by the soil stress sensor 17, and the like, and the external (top and side) deformation characteristics of the slope measured by the two high-speed cameras 5, and the data such as the evolution of the internal parameters and the external deformation characteristics of the slope type 15 collected by the recording computer 8 through the data transmission line 11. And (3) closing the soil layer temperature controller 1 after the slope model 15 reaches the destruction standard, stopping decomposition gradually when the hydrate layer is not heated any more, and closing the environment temperature controller 7 after the whole test system recovers to the original environment temperature to stop the experiment. Through the process, controllable hydrate decomposition of the slope containing the hydrate layer and simulation of the submarine environment can be realized, and the internal parameter evolution and external deformation characteristics of the slope model can be monitored simultaneously.
Further, the slope model 15 is composed of three soil layers, which are respectively: and preparing the slope model 15 in a layering manner by the upper covering layer, the hydrate layer and the lower lying layer, and consolidating the soil body to reach the set strength. In consideration of safety and experimental effects, the hydrate layer is prepared by taking tetrahydrofuran as a hydrate, and soil materials are all laboratory clay.
The invention has the beneficial effects that:
the invention has simple structure, clear functions of all modules and convenient assembly and implementation, can realize the controllable decomposition of hydrate of a slope containing a hydrate layer and the simulation of submarine environment, can simultaneously monitor the internal parameter evolution and external deformation characteristics of a slope model, and has remarkable technical effects, in particular:
(1) According to the invention, through the design of injecting seawater, preparing a slope model and an environment temperature control module, a slope body containing a hydrate layer is in the conditions of saturation, high pressure and low temperature, and the simulation of a submarine underwater environment can be realized.
(2) According to the invention, through the design of the slope destruction simulation module, the heating temperature of the hydrate layer is controlled, and then the real-time temperature and pressure state of the hydrate is controlled, so that the controllable generation and decomposition of the hydrate can be realized.
(3) According to the invention, by designing the parameter monitoring and collecting module, the evolution of internal parameters such as the increase of the super pore pressure and the reduction of the soil pressure and the deformation characteristics of the external part (top and side) of the slope are monitored in real time, and the real-time monitoring of the evolution of the internal parameters of the slope and the real-time monitoring of the external deformation characteristics can be realized at the same time.
Drawings
FIG. 1 is a schematic diagram of the structure of the experimental system according to the present invention;
FIG. 2 is a soil layer temperature control circuit diagram according to the present invention;
FIG. 3 is a diagram of the sensor layout of the present invention;
in the figure: 1 soil layer temperature controller; 2, a fiber grating demodulator; 3, a low-temperature box; 4, an experimental model box; 5 a high-speed camera; 6, an image collector; 7 ambient temperature controller; 8, a computer; 9 soil temperature system control line; 10 optical fiber transmission lines; 11 a data transmission line; 12 a sensor signal transmission line; 13 ambient temperature system control line; 14 a ramp floor; 15 a slope model; 16 fiber grating pore pressure sensors; 17 a soil stress sensor; 18 a temperature sensor; 19 temperature control line; 20 heating the wire.
Detailed Description
In order to further understand the present invention, the following description is made with reference to the accompanying drawings and technical solutions.
Fig. 1 shows a specific embodiment of the experimental system for simulating hydrate decomposition triggering seabed slope destruction according to the invention. Fig. 2 is a soil layer temperature control circuit diagram, which shows a method for triggering hydrate decomposition by temperature change, namely, by reasonably arranging temperature control lines and heating lines, the temperature of the soil layer is controlled in a partition mode to be a set value, and then hydrate decomposition in the soil layer is triggered. Fig. 3 is a layout diagram of sensors in a soil layer, which shows the layout mode of soil stress sensors and fiber bragg grating pore pressure sensors in the soil layer, so that the distribution conditions of soil pressure and pore pressure in an experimental slope can be accurately obtained, and the purpose of accurately describing the mechanical characteristics of the inside of the soil layer in the hydrate decomposition process can be achieved.
The use method of the experiment simulation system comprises the following steps:
first, the experiment simulation system is assembled
Firstly, placing an experimental model box 4 in a low-temperature box 3, and connecting the low-temperature box 3 with an environmental temperature controller 7 through an environmental temperature system control line 13 to form an environmental temperature control system together; according to the figure 2, a temperature sensor 18, a temperature control line 19 and a heating line 20 are arranged on a slope bottom plate 14, a soil temperature system control line 9 (comprising the temperature control line 19 and the heating line 20) is led out of a soil layer temperature controller 1, and a temperature control line is debugged to be a passage. Then, a slope model 15 is prepared in the experimental model box 4 according to experimental conditions, that is, the slope model 15 is prepared on a slope bottom plate 14 on which a temperature control circuit is arranged: preparing a lower lying layer by using remolded clay, solidifying and removing the clay with excessive thickness, then mixing tetrahydrofuran and the clay in proportion and filling the mixture into a hydrate layer, setting an environment temperature controller 7 to be at an appropriate temperature, standing for more than 24 hours to ensure that the tetrahydrofuran is fully synthesized into the hydrate to form the hydrate layer, finally covering the solidified clay layer on the hydrate layer, solidifying the clay layer according to the solidification pressure, and cutting the clay layer to form a slope model 15; in the process of preparing the hydrate layer, according to fig. 3, a fiber grating pore pressure sensor 16 and a soil stress sensor 17 are embedded in the slope model 15 and are respectively connected to the fiber grating demodulator 2 and the image collector 6 through a fiber transmission line 10 and a sensor signal transmission line 12. Finally, fixing high-speed cameras 5 at the top of the soil layer and outside the model box respectively, and connecting the high-speed cameras to an image collector 6 through sensor signal transmission lines 12; the output signals of the fiber grating demodulator 2 and the image collector 6 are linked to the computer 8 through a data transmission line 11, and various data of the designed working condition are monitored and collected in real time. And finishing the assembly work of the experimental system.
In this embodiment, the model base plate 14 is located in the experimental model box 4, and it forms 10 ° with the lower surface of the experimental model box 4, and both the slope top surface and the slope foot surface of the slope base plate 14 are rectangles perpendicular to the transparent side surface of the experimental model box 4, and the rectangle is 30cm long and 10cm wide.
In this embodiment, the heating wires 20 are arranged in a zigzag manner, wherein 2 small zigzag arrangement areas are arranged at the middle inclined section of the slope bottom plate 14 to simulate the heating decomposition of the upper or lower area of the slope section of the hydrate layer; the temperature sensors 18 are arranged in 2 groups in the direction vertical to the transparent side face of the model box 4, 3 temperature sensors are arranged in each group along the inclined direction of the slope bottom plate 14, and the heating temperatures of the top section, the middle section and the bottom section of the near slope can be monitored in real time; the temperature control lines 19 are arranged in parallel, and 2 groups (total 6) of temperature data are transmitted to the soil layer temperature controller 1, so that accurate closed-loop control of the soil layer temperature is realized.
In this embodiment, the slope model 15 specifically includes: an overlying clay layer, a tetrahydrofuran hydrate layer and a lying clay layer. The slope model 15 is placed on the model bottom plate 14 with the temperature control circuit, and the thickness and the strength determined according to the experimental working conditions of the embodiment are as follows: after consolidation, the thicknesses of the overlying clay layer, the tetrahydrofuran hydrate layer and the underlying clay layer are respectively 6cm, 8cm and 6cm, and the consolidation strength reaches 3.9kPa.
In this embodiment, the fiber grating pore pressure sensors 16 and the soil stress sensors 17 are arranged in parallel on the tetrahydrofuran hydrate layer of the slope model 15, 3 groups are respectively arranged in the direction perpendicular to the transparent side surface of the model box 4, 4 fiber grating pore pressure sensors 16 and 12 soil stress sensors 17 are arranged in each group at equal intervals, and the total number of the fiber grating pore pressure sensors 16 and the total number of the soil stress sensors 17 are 12, and the optical fiber transmission lines 10 and the sensor signal transmission lines 12 are respectively connected to the fiber grating pore pressure sensors 16 and the soil stress sensors 17 by adopting a serial connection method, so as to be used for the internal super-pore pressure and the soil pressure of the slope in the experimental process.
Second, simulation of the subsea environment
After the assembly is finished, a certain amount of seawater is injected into the experimental model box 4 to submerge the slope top of the slope model 15 by 20cm according to experimental working conditions so as to simulate the submarine environment. After standing and saturation for 24h, the environment temperature controller 7 can be adjusted to reduce the temperature in the low temperature box 3 from room temperature to the set environment temperature of 7 ℃, and when the data of the temperature transmitted to the soil layer temperature controller 1 by the temperature sensor 18 is constant, the hydrate slope environment temperature is considered as the set temperature, namely the environment condition before the experiment of the hydrate decomposition process is achieved.
Thirdly, developing experiments and collecting data
Design conditions, namely setting three heating temperatures: (1) 10 deg.C, (2) 15 deg.C, and (3) 20 deg.C; the heating areas are distinguished, and three heating modes are set: the experiment device comprises (1) heating an upper square-shaped area, (2) heating a lower square-shaped area, and (3) integrally heating, wherein 9 working conditions are formed by the heating, and experiments are carried out in different times. Heating wire 20 on slope bottom plate 14 is controlled through soil layer temperature controller 1, the monitoring comes from temperature sensor 18, the temperature data of the soil layer real-time variation of temperature control line 19 input to soil layer temperature controller 1, pore pressure and soil pressure that collect when computer 8 have the increment, consider promptly that the hydrate layer begins to decompose, data such as slope internal parameter evolution and external deformation characteristic that simultaneously the collection computer 8 collected, close soil layer temperature controller 1 after waiting that slope model 15 reaches the destruction standard, treat that whole test system resumes former ambient temperature, close ambient temperature controller 7, stop the experiment.
By the experiment system for simulating the hydrate decomposition to trigger the seabed slope damage and the using method, the simulation of the seabed underwater environment, the controllable generation and decomposition of the hydrate, the slope internal parameter evolution and the real-time monitoring of the external deformation characteristics can be realized. By utilizing the experimental system and the using method, working conditions can be designed and experiments can be developed according to production modes, slope shapes, soil layer properties and other multi-factors, so that the rule that hydrate decomposition triggers submarine slope damage is explored, the research on the disaster-causing mechanism that slope instability is caused by hydrate exploitation and engineering construction is threatened is facilitated, and the experimental system and the using method have great significance on ocean strong national strategy and double-carbon targets in China.
The above-mentioned embodiments only express the embodiments of the present invention, but not should be understood as the limitation of the scope of the invention patent, it should be noted that, for those skilled in the art, many variations and modifications can be made without departing from the concept of the present invention, and these all fall into the protection scope of the present invention.
Claims (7)
1. An experimental system for simulating hydrate decomposition to trigger seabed slope damage is characterized by comprising an environment temperature control module, a slope damage simulation module and a parameter monitoring and acquisition module;
the environment temperature control module: comprises an environment temperature controller (7), a low temperature box (3) and an environment temperature system control line (13); the environment temperature controller (7) is connected with the low-temperature box (3) through an environment temperature system control line (13) and is used for simulating a seabed low-temperature environment and providing a proper hydrate generation temperature; the low temperature box (3) is provided with a through hole for passing through a soil temperature system control line (9) and a sensor signal transmission line (12);
the slope destruction simulation module: the soil temperature system control device comprises an experimental model box (4), a slope bottom plate (14), a multi-layer soil slope (15), a soil temperature controller (1), a soil temperature system control line (9) and a temperature sensor (18), wherein the soil temperature system control line (9) comprises a temperature control line (19) and a heating line (20); the soil temperature controller (1) is connected with a heating wire (20), and the heating wire (20) is arranged on the upper surface of the slope bottom plate (14); the soil temperature controller (1) is connected with the temperature sensor (18) through a temperature control line (19), and the temperature control line (19) and the temperature sensor (18) are arranged on the upper surface of the slope bottom plate (14) in the same way; the experimental model box (4) is placed in the low-temperature box (3), and one side of the experimental model box (4) is set to be transparent in order to realize monitoring of internal parameters of the slope model (15); the model bottom plate (14) is positioned in the experimental model box (4), forms a certain angle with the lower surface of the experimental model box (4), and adjusts the angle according to specific experimental working conditions; the slope model (15) is arranged on a model bottom plate (14) with a temperature control circuit, and the shape and the thickness of the slope model are changed according to different experimental working conditions;
the parameter monitoring and collecting module comprises: the device comprises a high-speed camera (5), an image collector (6), a fiber grating pore pressure sensor (16), an optical fiber transmission line (10), a fiber grating demodulator (2), a soil stress sensor (17), a sensor signal transmission line (12), a data transmission line (11) and a computer (8); the high-speed camera (5) is arranged on the transparent side and the top of the experimental model box (4), and the high-speed camera (5) is connected to the image collector (6) through a sensor signal transmission line (12) and used for monitoring the internal deformation and the external three-dimensional form change of the slope model (15) in the experimental process; the fiber bragg grating pore pressure sensor (16) and the soil stress sensor (17) are pre-buried in a soil layer of the slope model (15) and are respectively connected to the fiber bragg grating demodulator (2) and the image collector (6) through the fiber transmission line (10) and the sensor signal transmission line (12), and the two transmission lines and the sensors are connected in series for the internal super-pore pressure and the soil pressure of the slope in the experimental process; output signals of the fiber grating demodulator (2) and the image collector (6) are linked to a computer (8) through a data transmission line (11), and various data of the designed working condition are monitored and collected in real time.
2. The experimental system for simulating hydrate decomposition triggering seabed slope destruction according to claim 1, wherein the temperature sensor (18), the temperature control wire (19) and the heating wire (20) are arranged on the upper surface of the slope bottom plate (14) in a specific arrangement manner: the heating wires (20) are arranged in a shape of a Chinese character 'hui', wherein a plurality of small-sized hui-shaped arrangement areas are arranged at the middle inclined section of the slope bottom plate (14), and can simulate the punctiform heating decomposition and the area heating decomposition of hydrates according to specific working conditions; the temperature sensors (18) are arranged in a plurality of groups in the direction vertical to the transparent side surface of the model box (4), and each group is arranged at equal intervals along the inclined direction of the slope bottom plate (14), so that the heating temperature of the soil layer can be monitored in real time; the temperature control line (19) plays a role of connecting the temperature sensor (18), is arranged in a parallel state, and transmits soil layer temperature data to the soil layer temperature controller 1 so as to realize accurate closed-loop control of the soil layer temperature.
3. The experimental system for simulating the hydrate decomposition triggering seabed slope damage as claimed in claim 1, wherein the fiber grating pore pressure sensors (16) and the soil stress sensors (17) are arranged side by side on hydrate layers in the slope model (15), a plurality of groups are also arranged in the direction perpendicular to the transparent side surface of the model box (4), each group is arranged at equal intervals along the distribution direction of the hydrate layers, and a plurality of groups are embedded at equal intervals from the top of the hydrate layers to the bottom of the hydrate layers.
4. An experimental system for simulating hydrate decomposition triggering seabed slope destruction as claimed in claim 1, wherein the experimental model box (4) is made of rigid material, and the inner surface of the experimental model box (4) is smoothed in order to reduce boundary effect influence.
5. A method of using the experimental system for simulating hydrate decomposition triggering seabed slope destruction according to any one of claims 1 to 4, is characterized by comprising the following steps:
firstly, assembling an experimental system for simulating the decomposition of hydrate to trigger the damage of a seabed slope;
secondly, injecting seawater into the experimental model box (4) according to experimental working conditions so as to simulate the submarine environment; after the seawater submerges the slope model (15) to the experiment setting position, adjusting the environment temperature controller (7) to enable the temperature in the low-temperature box (3) to be reduced to the experiment setting environment temperature from room temperature, sensing the real-time temperature of each position of a hydrate layer by a temperature sensor (18) arranged in the slope model (15) in the process, and transmitting the real-time temperature to the soil layer temperature controller (1) through a temperature control line (19), and when each temperature reading displayed by the soil layer temperature controller (1) is constant, considering that the environment temperature of the hydrate slope model (15) reaches the setting temperature, namely the environment condition before the experiment of the hydrate decomposition process is achieved;
thirdly, according to experimental working conditions, a heating wire (20) on the slope bottom plate (14) is controlled through the soil layer temperature controller (1), a hydrate layer is heated, and real-time soil layer changing temperature data input into the soil layer temperature controller (1) from the temperature sensor (18) and the temperature control wire (19) is monitored; the decomposition of the hydrate is controlled by the temperature and pressure condition of the sediment of the occurrence layer, the hydrate stably exists under the action of the initial environment temperature and the soil body pressure, when the pressure of the soil body containing the hydrate is kept unchanged and the temperature is increased to be higher than the critical temperature, the hydrate is decomposed, the soil layer parameters are changed while the super pore pressure is generated, and therefore when the readings of all positions in the soil layer temperature controller (1) reach the preset temperature of the experimental working condition, the hydrate is considered to start to decompose; along with the continuous decomposition of the hydrate, the super-pore pressure of a hydrate layer in the slope model (15) is continuously accumulated, and the soil strength has a weakening trend, so that the method can be initiated as follows: the evolution of internal parameters such as pore pressure increase measured by a fiber grating pore pressure sensor (16), soil pressure decrease measured by a soil stress sensor (17) and the like, and slope external deformation characteristics measured by two high-speed cameras (5), and data such as slope type (15) internal parameter evolution, external deformation characteristics and the like are collected by a recording computer (8) through a data transmission line (11); after the slope model (15) reaches the damage standard, closing the soil layer temperature controller (1), stopping decomposition gradually when the hydrate layer is not heated any more, and stopping the experiment when the whole test system recovers to the original environment temperature and closing the environment temperature controller (7);
through the process, controllable hydrate decomposition of the slope containing the hydrate layer and simulation of the submarine underwater environment can be realized, and the internal parameter evolution and external deformation characteristics of the slope model can be monitored simultaneously.
6. The use method of the experimental system for simulating the hydrate decomposition triggering seabed slope destruction according to the claim 5, is characterized in that the slope model (15) is composed of three soil layers, which are respectively: an upper covering layer, a hydrate layer and a lower lying layer, a slope model (15) is prepared in a layering mode, and soil is consolidated to reach set strength.
7. The use method of the experimental system for simulating the hydrate decomposition to trigger the seabed slope destruction as claimed in claim 6, wherein the hydrate layer is prepared by using tetrahydrofuran as hydrate, and soil materials are laboratory clay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211452846.XA CN115754152A (en) | 2022-11-21 | 2022-11-21 | Experimental system for simulating hydrate decomposition triggering seabed slope damage and using method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211452846.XA CN115754152A (en) | 2022-11-21 | 2022-11-21 | Experimental system for simulating hydrate decomposition triggering seabed slope damage and using method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115754152A true CN115754152A (en) | 2023-03-07 |
Family
ID=85333138
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211452846.XA Pending CN115754152A (en) | 2022-11-21 | 2022-11-21 | Experimental system for simulating hydrate decomposition triggering seabed slope damage and using method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115754152A (en) |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004204562A (en) * | 2002-12-25 | 2004-07-22 | Kajima Corp | Method and system for mining submarine gas hydrate |
| CN101701955A (en) * | 2009-10-27 | 2010-05-05 | 中国科学院力学研究所 | Experimental device and experimental method for simulating obvious stratum damage resulted from hydrate decomposition |
| CN103869046A (en) * | 2014-04-08 | 2014-06-18 | 中国海洋大学 | Simulation and observation system for submarine landslide caused by natural gas hydrate decomposition |
| US20140227036A1 (en) * | 2013-02-13 | 2014-08-14 | Korea Institute Of Geoscience And Mineral Resources | Apparatus and method for simulating submarine landslide resulting from gas hydrate dissociation or earthquake |
| CN206146927U (en) * | 2016-11-10 | 2017-05-03 | 西南石油大学 | Decomposition of simulation gas hydrate causes submarine landslide experimental apparatus |
| CN108614090A (en) * | 2018-05-17 | 2018-10-02 | 同济大学 | Simulate the experimental rig that gas hydrate dissociation induces seabed slope instability |
| CN109386283A (en) * | 2018-09-21 | 2019-02-26 | 北京大学 | A kind of experimental provision causing submarine landslide suitable for simulating combustible ice exploitation |
| CN209568078U (en) * | 2019-03-09 | 2019-11-01 | 西南石油大学 | A kind of box sea bed gas hydrate heat resolve device |
| CN110657944A (en) * | 2019-11-06 | 2020-01-07 | 大连理工大学 | Transparent soil rotating water tank-based seabed landslide evolution process simulation system and experimental method |
| US20200318959A1 (en) * | 2017-11-08 | 2020-10-08 | Guangzhou Institute Of Energy Conversion, Chinese Academy Of Sciences | Real-time monitoring apparatus for seafloor deformation during hydrate exploitation |
| CN112665986A (en) * | 2021-03-16 | 2021-04-16 | 中国科学院地质与地球物理研究所 | Test system and method for simulating geological deformation caused by hydrate thermal recovery |
| CN113009109A (en) * | 2021-02-07 | 2021-06-22 | 山东科技大学 | Simulation experiment device and method for inducing seabed landslide through natural gas hydrate decomposition |
| CN115032689A (en) * | 2022-04-28 | 2022-09-09 | 山东科技大学 | Microseism-based natural gas hydrate exploitation seabed movement deformation monitoring method |
-
2022
- 2022-11-21 CN CN202211452846.XA patent/CN115754152A/en active Pending
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004204562A (en) * | 2002-12-25 | 2004-07-22 | Kajima Corp | Method and system for mining submarine gas hydrate |
| CN101701955A (en) * | 2009-10-27 | 2010-05-05 | 中国科学院力学研究所 | Experimental device and experimental method for simulating obvious stratum damage resulted from hydrate decomposition |
| US20140227036A1 (en) * | 2013-02-13 | 2014-08-14 | Korea Institute Of Geoscience And Mineral Resources | Apparatus and method for simulating submarine landslide resulting from gas hydrate dissociation or earthquake |
| CN103869046A (en) * | 2014-04-08 | 2014-06-18 | 中国海洋大学 | Simulation and observation system for submarine landslide caused by natural gas hydrate decomposition |
| CN206146927U (en) * | 2016-11-10 | 2017-05-03 | 西南石油大学 | Decomposition of simulation gas hydrate causes submarine landslide experimental apparatus |
| US20200318959A1 (en) * | 2017-11-08 | 2020-10-08 | Guangzhou Institute Of Energy Conversion, Chinese Academy Of Sciences | Real-time monitoring apparatus for seafloor deformation during hydrate exploitation |
| CN108614090A (en) * | 2018-05-17 | 2018-10-02 | 同济大学 | Simulate the experimental rig that gas hydrate dissociation induces seabed slope instability |
| CN109386283A (en) * | 2018-09-21 | 2019-02-26 | 北京大学 | A kind of experimental provision causing submarine landslide suitable for simulating combustible ice exploitation |
| CN209568078U (en) * | 2019-03-09 | 2019-11-01 | 西南石油大学 | A kind of box sea bed gas hydrate heat resolve device |
| CN110657944A (en) * | 2019-11-06 | 2020-01-07 | 大连理工大学 | Transparent soil rotating water tank-based seabed landslide evolution process simulation system and experimental method |
| CN113009109A (en) * | 2021-02-07 | 2021-06-22 | 山东科技大学 | Simulation experiment device and method for inducing seabed landslide through natural gas hydrate decomposition |
| CN112665986A (en) * | 2021-03-16 | 2021-04-16 | 中国科学院地质与地球物理研究所 | Test system and method for simulating geological deformation caused by hydrate thermal recovery |
| CN115032689A (en) * | 2022-04-28 | 2022-09-09 | 山东科技大学 | Microseism-based natural gas hydrate exploitation seabed movement deformation monitoring method |
Non-Patent Citations (2)
| Title |
|---|
| 宋晓龙;赵维;年廷凯;焦厚滨;: "水合物分解条件下海底黏土质斜坡破坏实验模拟", 上海交通大学学报, no. 01, 28 January 2020 (2020-01-28), pages 43 - 51 * |
| 张旭辉;鲁晓兵;王淑云;李清平;姚海元;: "天然气水合物快速加热分解导致地层破坏的实验", 海洋地质与第四纪地质, no. 01, 28 February 2011 (2011-02-28), pages 157 - 164 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Langseth et al. | The distribution of geothermal and geochemical gradients near Site 501/504: implications for hydrothermal circulation in the oceanic crust | |
| Crawford et al. | Constraints on melt in the lower crust and Moho at the East Pacific Rise, 9 48′ N, using seafloor compliance measurements | |
| CN107421716B (en) | Uninterrupted wave generation device and method for wave physical model test under water level change | |
| CN106018739B (en) | A kind of tidal flat Creek system geomorphic evolution physical model experiment system and method | |
| CN107024244B (en) | Marine site hydrate mining environment three-dimensional monitoring system | |
| CN105786032B (en) | A kind of trial zone level of ground water accuracy-control system and method | |
| CN208706080U (en) | A kind of simulator of coastal region seawater invasion process | |
| CN106645640B (en) | A kind of excavation of foundation pit ground centrifuge test device and test method | |
| CN109436197A (en) | Interior estimates act on coupled motions and the dynamometry experimental system for simulating of lower ocean floating structure | |
| CN205333622U (en) | Landslide device for model test | |
| CN205991862U (en) | Seepage continuous monitoring experimental provision under special formation environmental condition | |
| CN203705664U (en) | Benthonic geophysical observation device | |
| CN208685680U (en) | A kind of geosynthetic reinforced pile supported embankments on soft soil model test apparatus | |
| CN107829451A (en) | Horizontal bidirectional cyclic load loading device and test method based on model casing | |
| CN102605738B (en) | Method for monitoring change of internal force of resin mortar block during riverbed blowing up scouring period of hyper-concentration sediment flood | |
| CN105716958A (en) | Foundation model test device for simulating lifting and dropping of confined water head | |
| CN115754152A (en) | Experimental system for simulating hydrate decomposition triggering seabed slope damage and using method | |
| CN109357829A (en) | A kind of wave suitable for simulating underwater multiple spot Seismic input-stream coupling test device | |
| CN206431233U (en) | A kind of marine wind electric field 220kV sends out extra large cable online monitoring system | |
| CN202595695U (en) | Device for making clay block used in simulation test of high sand concentration flood 'bottom tearing scour' | |
| KR101033207B1 (en) | Submerged breakwater having multiple overflow wall | |
| CN207231750U (en) | Wave physical experiments wave simulator free of discontinuities under water level real-time change | |
| CN212134030U (en) | Experimental device for simulating wave energy dissipation hydrodynamic force of island reef terrace | |
| CN107966397A (en) | Process monitoring equipment and the monitoring method using the device are moved back in a kind of Tu Ya erosions | |
| CN207499007U (en) | Horizontal bidirectional cyclic load loading device based on model casing |
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 |