CN111594157A - Experimental device and method for simulating seabed slope instability caused by combustible ice decomposition under complex terrain condition - Google Patents
Experimental device and method for simulating seabed slope instability caused by combustible ice decomposition under complex terrain condition Download PDFInfo
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- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
- E21B49/001—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells specially adapted for underwater installations
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Abstract
The invention discloses an experimental device and method for simulating seabed slope instability caused by combustible ice decomposition under complex terrain conditions, wherein the experimental device comprises a support system, a landslide induction system, a combustible ice decomposition simulation stratum, a temperature control system and a control system: the support system changes the height fluctuation state of the inner surface layer of the water tank through the telescopic lifting rod to achieve the purpose of simulating the real topography of the seabed, the landslide induction system sprays combustible ice to decompose similar gas through the small holes, the temperature control system is used for controlling the temperature of the combustible ice to decompose the similar gas, the overall control system automatically realizes the change of the height of the telescopic lifting rod through computer control, so that the form change of the inner surface layer of the water tank is driven, the change of the topography is simulated, and the overall process that the combustible ice decomposes to cause the landslide of the seabed due to the change of environmental conditions can be accurately simulated through the cooperative work of the systems.
Description
Technical Field
The invention belongs to the technical field of ocean engineering geology, and particularly relates to an experimental device and method for simulating seabed slope instability caused by combustible ice decomposition under a complex terrain condition.
Background
The submarine landslide is a common marine geological disaster in offshore delta, is a rapid sliding process of unconsolidated soft sediments at the seabed along a slope under the action of gravity, has time-varying structural characteristics and mechanical properties, is different from the slope problem on land to a certain extent, and is essentially the formation and gradual expansion of a shear band in a soil body.
At present, experimental research related to the landslide of the sea bottom is basically limited to damage on a slope surface with a fixed inclination angle, the complex terrain of the sea bottom cannot be truly simulated, and the guiding significance to actual engineering construction is insufficient. Meanwhile, the conventional submarine landslide device is concentrated in the simulation of submarine landslide induced by seismic action and combustible ice exploitation, and the research on submarine landslide caused by the decomposition of combustible ice due to the change of marine environment is relatively insufficient. In order to better simulate the real submarine topography and simulate the submarine landslide caused by the decomposition of combustible ice caused by the change of marine environment, a submarine landslide experimental device suitable for complex submarine topography is urgently needed, the stability of the submarine slope caused by the decomposition and the damage of the combustible ice is researched, the occurrence mechanism of the submarine landslide is revealed, and the purpose of improving the engineering safety is achieved.
Disclosure of Invention
The invention aims to overcome the technical defects and provides an experimental device and method for simulating the instability of a seabed slope under a complex terrain condition caused by the decomposition of combustible ice, which are suitable for analyzing the whole process of the seabed landslide caused by the decomposition of the combustible ice in the seabed complex terrain.
The embodiment of the application discloses experimental apparatus for seabed slope unstability under simulation combustible ice decomposes initiation complicated topography condition, it includes that support system, landslide induce system, combustible ice decomposes simulation stratum, temperature control system and control system:
the support system comprises a non-cover transparent water tank, a flexible material plane, a telescopic lifting rod and a hydraulic transmission and control device, wherein the telescopic lifting rod is fixed on the bottom surface of the non-cover transparent water tank in a periodic arrangement mode and is controlled to lift by the hydraulic transmission and control device; the flexible material plane is positioned above the telescopic lifting rod, the periphery of the flexible material plane is connected to the side wall of the uncovered transparent water tank, and each node inside the flexible material plane is connected with the top end of the telescopic lifting rod;
the landslide inducing system comprises a flexible material hose, a rubber hose, an air pump and a stop valve, wherein the air pump is connected with one end of the flexible material hose in a sealing mode through the rubber hose, and the stop valve is arranged on the rubber hose;
the temperature control system comprises a thermometer, a waterproof heater and a waterproof refrigerator, wherein the waterproof heater and the waterproof refrigerator are arranged in the flexible material hose, and the thermometer is arranged on the surface of the flexible material hose;
the combustible ice decomposition simulation stratum is arranged on a flexible material plane, and the flexible material hose, the rubber hose, the thermometer, the waterproof heater and the waterproof refrigerator are all positioned in the combustible ice decomposition simulation stratum;
and the control system is respectively connected with the hydraulic transmission control device, the waterproof heater and the waterproof refrigerator.
Preferably, the periphery of the plane of the flexible material is detachably connected with the wall surface of the uncovered transparent water tank through a zipper device.
Preferably, the top end of the telescopic lifting rod is smoothly connected with each node inside the flexible material plane through a bolt.
Preferably, control system includes electric wire, circuit control system, computer control system, the electric wire will hydraulic pressure biography controlling means with computer control system links to each other for control telescopic lifter's motion, the electric wire will waterproof heater with computer control system links to each other for the inside temperature of control water tank, circuit control system passes through the electric wire with computer control system hydraulic pressure biography controlling means waterproof heater waterproof refrigerator is connected for the activity of control whole device.
Preferably, the flexible material hose is a cylinder with a bottom, can be freely bent, and is provided with a plurality of small holes distributed along the axial direction on the pipe wall, and the inside of each small hole is provided with an anti-blocking filter screen.
The invention also discloses a submarine landslide stability analysis experimental method of the experimental device, which comprises the following steps:
a. horizontally placing the uncovered transparent water tank on a horizontal platform, and arranging an observation instrument at the periphery of the water tank;
b. starting a control system, inputting the elevation of each control point of a telescopic lifting rod, changing the length of a rod piece by the telescopic lifting rod through the hydraulic transmission and control device according to the elevation of each control point, and driving the flexible material plane on the surface to deform so as to simulate the complex topography of the seabed;
c. the flexible material plane is used as a seabed base surface, a combustible ice decomposition simulation stratum is laid on the flexible material plane according to a predetermined researched combustible ice decomposition simulation stratum, and the landslide induction system and the temperature control system except the air pump and the stop valve are buried at corresponding positions in the combustible ice decomposition simulation stratum;
d. inputting experiment control temperature into the computer control system, enabling the waterproof heater or the waterproof refrigerator to enter a working state through the control system, enabling the thermometer reading to reach the experiment control temperature and keeping the temperature stable;
e. opening the air pump, pumping combustible ice similar gas into the rubber hose, and filling the rubber hose with the combustible ice similar gas;
f. opening a stop valve to enable the combustible ice similar gas to enter the flexible material hose and enter the combustible ice decomposition simulation stratum through a small hole in the flexible material hose to initiate landslide; and recording data of the landslide process and the landslide body after stabilization by the observation instrument.
Compared with the prior art, the invention has the beneficial effects that:
the invention relates to an experimental device for simulating seabed slope instability under complex terrain conditions caused by combustible ice decomposition, wherein a support system changes the height fluctuation state of the inner surface layer of a water tank through a telescopic lifting rod, so that the aim of simulating seabed real terrain is fulfilled; the landslide inducing system sprays combustible ice to decompose similar gas through the small holes, and the temperature control system is used for controlling the temperature of the combustible ice to decompose the similar gas; in addition, the change of the height of the telescopic lifting rod is controlled to drive the change of the form of the surface layer in the water tank so as to simulate the change of the terrain, and all the systems work cooperatively to accurately simulate the whole process of the seabed landslide caused by the decomposition of the combustible ice due to the change of environmental conditions in geological activities, so that the system has certain help for researching the mechanism of the seabed landslide caused by the decomposition of the combustible ice and the safe exploitation of the combustible ice in the future.
The invention fills the blank of the experiment field of simulating the decomposition of the combustible ice under the complex submarine topography in the geological field of ocean engineering, and has strong guiding function for researching the submarine landslide generation mechanism, realizing the safe exploitation of the combustible ice and ensuring the safe construction of the submarine engineering.
Drawings
FIG. 1 is an overall block diagram of the present invention;
FIG. 2 is a top view of the seat system and landslide induction system of the present invention;
FIG. 3 is a schematic view of the telescoping lifter of the present invention;
FIG. 4 is a top view of the flexible material hose of the present invention;
FIG. 5 is a cross-sectional view of a flexible material hose of the present invention;
in the figure: 1-uncovered transparent water tank; 2-plane of flexible material; 3-a telescopic lifting rod; 4-flexible material hose; 5-a rubber hose; 6, an air pump; 7-a stop valve; 8-a thermometer; 9-waterproof heater; 10-an electrical wire; 11-hydraulic transmission and control device; 12-a circuit control system; 13-a computer control system; 14-a bolt; 15-a zipper; 16-small holes; 17-anti-blocking filter screen; 18-the combustible ice decomposes the simulated formation; 19-waterproof refrigerator.
Detailed Description
The invention is further described with reference to the drawings and the specific embodiments in the following description. It is to be noted that the following examples are intended to facilitate the understanding of the present invention, and do not set forth any limitation thereto.
The embodiment specifically discloses an experimental apparatus for simulating seabed slope instability under complicated topography condition caused by combustible ice decomposition, which comprises a support system, a landslide induction system, a combustible ice decomposition simulation stratum, a temperature control system and a control system:
the support system comprises a uncovered transparent water tank 1, a flexible material plane 2, a telescopic lifting rod 3 and a hydraulic transmission and control device 11, wherein the telescopic lifting rod 3 is fixed on the bottom surface of the uncovered transparent water tank 1 in a periodic arrangement mode, and the telescopic lifting rod 3 is controlled to lift by the hydraulic transmission and control device 11; the flexible material plane is positioned above the telescopic lifting rod, the periphery of the flexible material plane is connected to the side wall of the uncovered transparent water tank 1, and each node inside the flexible material plane is connected with the top end of the telescopic lifting rod;
the landslide inducing system comprises a flexible material hose 4, a rubber hose 5, an air pump 6 and a stop valve 7, wherein the air pump 6 is hermetically connected with one end of the flexible material hose 5 through the rubber hose 5, and the stop valve 7 is arranged on the rubber hose 5;
the temperature control system comprises a thermometer 8, a waterproof heater 9 and a waterproof refrigerator 19, the waterproof heater and the waterproof refrigerator are arranged in the flexible material hose 4, and the thermometer 8 is arranged on the surface of the flexible material hose 5;
the combustible ice decomposition simulation stratum is arranged on the flexible material plane 2, and the flexible material hose 4, the rubber hose 5, the thermometer 8, the waterproof heater 9 and the waterproof refrigerator 19 are all positioned in the combustible ice decomposition simulation stratum;
the control system is respectively connected with the hydraulic transmission control device 11, the waterproof heater 9 and the waterproof refrigerator 19.
In one embodiment of the invention, as shown in fig. 2, the periphery of the plane of the flexible material is detachably connected with the wall surface of the uncovered transparent water tank 1 through a zipper device. The top end of the telescopic lifting rod is smoothly connected with each node inside the flexible material plane through a bolt.
In a specific embodiment of the present invention, the control system includes an electric wire 10, a circuit control system 12, and a computer control system 13, the electric wire connects the hydraulic transmission control device and the computer control system for controlling the movement of the telescopic lifting rod, the electric wire connects the waterproof heater and the computer control system for controlling the temperature inside the water tank, and the circuit control system is connected with the computer control system, the hydraulic transmission control device, the waterproof heater, and the waterproof refrigerator through the electric wire for controlling the movement of the whole device.
In a specific embodiment of the present invention, the transparent water tank without a cover is made of organic glass, and is a rectangular parallelepiped, and the length × width × height of the transparent water tank is 2 × 0.5 × 1 meter, and is divided into 100 square grids with length × width of 0.1 × 0.1 meter, the bottom surface of the transparent water tank without a cover is divided into a plurality of grids, and one telescopic lifting rod is arranged at each grid node.
Preferably, the length and the width of the plane of the flexible material are 2 meters and 0.5 meter, the periphery of the plane is fixedly connected to the position of 0.15 meter of the height of the side wall of the uncovered transparent water tank through a zipper structure, and the ductility is good. In the specific embodiment of the invention, the material selected by the flexible material plane can be polyester rubber/silicon rubber, which has better expansion ductility, and the shape can be recovered after the test is finished, so that the flexible material plane can be reused. The hydraulic transmission and control device is a hydraulic pump, and the telescopic lifting rod is a hydraulic telescopic rod.
Preferably, the telescopic lifting rod is a cylinder and is divided into three sections, the diameter of the telescopic lifting rod is 1 cm, and the length variation range of the telescopic lifting rod is 15 cm-45 cm.
Preferably, the flexible material hose is a cylinder with a bottom, the height of the flexible material hose is 1.5m, the diameter of the bottom surface of the flexible material hose is 0.05m, a plurality of small holes which are distributed along the axial direction and have the diameter of 0.002m are formed in the pipe wall of the flexible material hose, and an anti-blocking filter screen is arranged in each small hole. The flexible material hose 4 can be silica gel/PVC; which is free to flex so that the small holes therein are ready for placement in the combustible ice decomposition simulation formation. Therefore, the position of the combustible ice in the bottom layer, which is measured by the previous exploration data, is accurately simulated.
Preferably, the temperature measuring range of the thermometer is 0-100 ℃, the waterproof heater and the waterproof refrigerator can uniformly heat or refrigerate the gas in the flexible material hose, and the temperature change range is 0-100 ℃. The waterproof heater 9 is a heater provided with a sealing waterproof ring or waterproof glue at each joint of the shell, and the type of the heater can be a resistance electric heater. The waterproof refrigerator 19 is a refrigerator with a sealed waterproof ring or waterproof glue arranged at each joint of the shell, and the type of the refrigerator can be a semiconductor refrigerator.
Preferably, the air pump can pump a constant flow of combustible ice decomposition similar gas into the rubber hose.
According to the experimental device for simulating the submarine landslide caused by the decomposition of combustible ice under the complex submarine topography, the specific operation steps for carrying out the submarine landslide stability analysis experiment are as follows:
a. horizontally placing the uncovered transparent water tank on a horizontal platform, and arranging an observation instrument at the periphery of the water tank; the observation instrument may be an image recorder, a camera, or the like.
b. Starting a control system, inputting the elevation of each control point of a telescopic lifting rod, changing the length of a rod piece by the telescopic lifting rod through the hydraulic transmission and control device according to the elevation of each control point, and driving the flexible material plane on the surface to deform so as to simulate the complex topography of the seabed;
c. and laying corresponding stratum simulation materials according to the characters and the combustible ice positions of the studied combustible ice decomposition simulation stratum by taking the flexible material plane as a seabed basal plane, burying the landslide inducing system and the temperature control system except the air pump and the stop valve in the combustible ice decomposition simulation stratum, and enabling the small hole of the flexible material hose to be positioned at the position of the combustible ice in the actual seabed to be simulated so as to simulate the decomposition of the combustible ice. When the combustible ice in the actual seabed to be simulated is distributed in a sheet manner and the coverage area is wider, the small holes can be uniformly distributed on the axis of the flexible material hose at a certain density, or a plurality of flexible material hoses are used, so that the simulated scene is closer to the actual scene; the air pump and the stop valve are arranged at positions convenient to operate; the stratum simulation material is to select proper materials according to the softness of the stratum to be simulated, for example, clay, fine sand and other materials can be selected, and the softness of the stratum simulation material is adjusted according to the scene to be simulated.
d. Inputting experiment control temperature into the computer control system, enabling the waterproof heater or the waterproof refrigerator to enter a working state through the control system, enabling the thermometer reading to reach the experiment control temperature and keeping the temperature stable;
e. opening the air pump, pumping combustible ice similar gas into the rubber hose, and filling the rubber hose with the combustible ice similar gas; the combustible ice-like gas of the present application can be selected to be methane, which has similar gas properties to combustible ice decomposition gas, and is non-toxic and safe.
f. Opening a stop valve to enable the combustible ice similar gas to enter the flexible material hose and enter the combustible ice decomposition simulation stratum through a small hole in the flexible material hose to initiate landslide;
g. after the landslide body is stable, an observation instrument records relevant data, the air pump is closed, the stop valve is closed, the waterproof heater is closed, and the heights of all the telescopic lifting rods are adjusted to be initial default heights so as to protect the plane of the flexible material;
h. closing the control system, taking out the landslide induction system and the temperature control system, cleaning the flexible material hose, the rubber hose, the thermometer, the waterproof heater, the electric wire, unzipping the zipper, disassembling the flexible material plane and cleaning, wiping the uncovered transparent water tank and the telescopic lifting rod, and storing the uncovered transparent water tank and the telescopic lifting rod at a dark ventilation position for next use.
The invention is not the best known technology.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (9)
1. The utility model provides an experimental apparatus for simulation combustible ice decomposes and triggers seabed slope unstability under complicated topography condition which characterized in that includes support system, landslide induction system, combustible ice decomposes simulation stratum, temperature control system and control system:
the support system comprises a cover-free transparent water tank (1), a flexible material plane (2), telescopic lifting rods (3) and a hydraulic transmission and control device (11), wherein the telescopic lifting rods (3) are fixed on the bottom surface of the cover-free transparent water tank (1) in a periodic arrangement mode, and the telescopic lifting rods (3) are controlled to lift by the hydraulic transmission and control device (11); the flexible material plane is positioned above the telescopic lifting rod, the periphery of the flexible material plane is connected to the side wall of the uncovered transparent water tank (1), and each node inside the flexible material plane is connected with the top end of the telescopic lifting rod;
the landslide induction system comprises a flexible material hose (4), a rubber hose (5), an air pump (6) and a stop valve (7), wherein the air pump (6) is hermetically connected with one end of the flexible material hose (5) through the rubber hose (5), and the stop valve (7) is arranged on the rubber hose (5);
the temperature control system comprises a thermometer (8), a waterproof heater (9) and a waterproof refrigerator (19), the waterproof heater (9) and the waterproof refrigerator (19) are arranged in the flexible material hose (4), and the thermometer (8) is arranged on the surface of the flexible material hose (5);
the combustible ice decomposition simulation stratum (18) is arranged on the flexible material plane (2), and the flexible material hose (4), the rubber hose (5), the thermometer (8), the waterproof heater (9) and the waterproof refrigerator (19) are all located in the combustible ice decomposition simulation stratum (18);
the control system is respectively connected with the hydraulic transmission control device (11), the waterproof heater (9) and the waterproof refrigerator (19).
2. The experimental device as claimed in claim 1, wherein the periphery of the plane of the flexible material is detachably connected with the wall surface of the uncovered transparent water tank (1) through a zipper device.
3. The experimental apparatus as claimed in claim 1, wherein the top ends of the retractable lifting rods are smoothly connected with the nodes inside the plane of the flexible material through bolts.
4. The experimental apparatus as claimed in claim 1, wherein said control system comprises an electric wire, a circuit control system and a computer control system, said electric wire connects said hydraulic transmission control device with said computer control system for controlling the movement of said telescopic lifting rod, said electric wire connects said waterproof heater and said waterproof refrigerator with said computer control system for controlling the temperature inside the water tank, said circuit control system is connected with said computer control system, said hydraulic transmission control device, said waterproof heater and said waterproof refrigerator through said electric wire for controlling the movement of the whole apparatus.
5. The experimental device according to claim 1, characterized in that said uncovered transparent water tank is made of plexiglas, rectangular parallelepiped; the bottom surface of the uncovered transparent water tank is uniformly divided into a plurality of grids with the same size, and one telescopic lifting rod is arranged in each grid.
6. The experimental device as claimed in claim 1, wherein the flexible hose is a cylinder with a bottom, which can be bent freely, and has a plurality of small holes distributed along the axial direction on the wall, and the inside of the small holes is provided with an anti-blocking filter screen.
7. The experimental device as claimed in claim 1, wherein the waterproof heater and the waterproof refrigerator can uniformly heat and refrigerate the gas inside the flexible material hose.
8. The experimental device as claimed in claim 1, wherein the air pump can pump a constant flow of combustible ice decomposition similar gas into the rubber hose.
9. The experimental method for analyzing the stability of the sea landslide of the experimental facility as claimed in claim 1, which is characterized by comprising the following steps:
a. horizontally placing the uncovered transparent water tank on a horizontal platform, and arranging an observation instrument at the periphery of the water tank;
b. starting a control system, inputting the elevation of each control point of a telescopic lifting rod, changing the length of a rod piece by the telescopic lifting rod through the hydraulic transmission and control device according to the elevation of each control point, and driving the flexible material plane on the surface to deform so as to simulate the complex topography of the seabed;
c. the flexible material plane is used as a seabed base surface, a combustible ice decomposition simulation stratum is laid on the flexible material plane according to a predetermined researched combustible ice decomposition simulation stratum, and the landslide induction system and the temperature control system except the air pump and the stop valve are buried at corresponding positions in the combustible ice decomposition simulation stratum;
d. inputting experiment control temperature into the computer control system, enabling the waterproof heater or the waterproof refrigerator to enter a working state through the control system, enabling the thermometer reading to reach the experiment control temperature and keeping the temperature stable;
e. opening the air pump, pumping combustible ice similar gas into the rubber hose, and filling the rubber hose with the combustible ice similar gas;
f. opening a stop valve to enable the combustible ice similar gas to enter the flexible material hose and enter the combustible ice decomposition simulation stratum through a small hole in the flexible material hose to initiate landslide; and recording data of the landslide process and the landslide body after stabilization by the observation instrument.
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| CN202010403334.9A CN111594157B (en) | 2020-05-13 | 2020-05-13 | Experimental device and method for simulating seabed slope instability caused by combustible ice decomposition under complex terrain condition |
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| CN202010403334.9A CN111594157B (en) | 2020-05-13 | 2020-05-13 | Experimental device and method for simulating seabed slope instability caused by combustible ice decomposition under complex terrain condition |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114295806A (en) * | 2021-12-29 | 2022-04-08 | 中国长江三峡集团有限公司 | Multi-field coupled loess-mudstone landslide hazard simulation test device and method |
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