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56 results about "Submarine landslide" patented technology
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Submarine landslides are marine landslides that transport sediment across the continental shelf and into the deep ocean. A submarine landslide is initiated when the downwards driving stress (gravity and other factors) exceeds the resisting stress of the seafloor slope material causing movements along one or more concave to planar rupture surfaces. Submarine landslides take place in a variety of different settings including planes as low as 1° and can cause significant damage to both life and property. Recent advances have been made in understanding the nature and processes of submarine landslides through the use of sidescan sonar and other seafloor mapping technology.
Visual natural gas hydrate sediment mechanical property testing apparatus
ActiveCN104155188AGet macroGet propertiesMaterial strength using tensile/compressive forcesOcean bottomDecomposition
The invention relates to a visual natural gas hydrate sediment mechanical property testing apparatus, belonging to the field of the measurement of basic natural gas hydrate physical properties. The visual natural gas hydrate sediment mechanical property testing apparatus mainly comprises an automatic-pressing triaxial apparatus main machine, an axial loading system, a confining pressure control system, a backpressure control system, a temperature control system, a data collection system and an X-ray CT (computed tomography) imaging system. The low-temperature high-pressure hydrate triaxial apparatus is organically combined with the X-ray CT imaging system, so that the testing on macro and micro mechanical properties of natural gas hydrate sediments can be synchronously carried out. The visual natural gas hydrate sediment mechanical property testing apparatus can simulate a stress state of a real reservoir stratum, macro and micro mechanical property data of the natural gas hydrate sediments can be acquired, the important significance on disclosing a deformation mechanism of the natural gas hydrate reservoir stratum and a triggering mechanism of geological hazards such as submarine landslide caused by the decomposition of natural gas hydrate can be realized, and an important guiding function for safely and high efficiently exploiting the natural gas hydrate can be realized.
Owner:DALIAN UNIV OF TECH
Simulation and observation system for submarine landslide caused by natural gas hydrate decomposition
InactiveCN103869046AImplement Partition DecompositionPowerfulUsing optical meansMaterial analysisOcean bottomDecomposition
The invention discloses a simulation and observation system for submarine landslide caused by natural gas hydrate decomposition. The simulation and observation system comprises a mechanical support, a heating decomposition unit and a deformation measurement unit, wherein the mechanical support is used for providing a platform and support for the heating decomposition unit and providing an observation area for the deformation measurement unit; the heating decomposition unit is used for heating an observed hydrate material so as to be decomposed and feeding back the amount of decomposition information to the deformation measurement unit; the deformation measurement unit is used for collecting a deformation signal in the mechanical support, observing the deformation process after the heating decomposition unit heats an observed test piece for decomposition according to the deformation signal, and obtaining the digital speckle images of the profile of the test piece in chronological order to generate the deformation information of the test piece for storage. The simulation and observation system solves the problems that in physical simulation experiments in a laboratory, the amount of decomposition and the decomposition area of material samples similar with a hydrate cannot be precisely controlled, the slope angle of the sample cannot be controlled, the landslide deformation cannot be quantitatively described and the like.
Owner:OCEAN UNIV OF CHINA
Equipment for submarine landslide monitoring
InactiveCN104990492AEasy to captureImprove accuracyElectrical/magnetic solid deformation measurementOcean bottomInformation support
The invention discloses a piece of equipment for submarine landslide monitoring. The equipment comprises a long rod-shaped sealing housing. A magnetic sensing mechanism is arranged inside the sealing housing. The magnetic sensing mechanism comprises a movable rod and a measuring rod. The upper end of the measuring rod is provided with a hollow chamber. The lower end of the movable rod is clamped inside the hollow chamber in a rotatable way. The hollow chamber bottom is provided with a magnetic sensing chip. The lower end of the movable rod is fixedly provided with a magnetic induction sheet. A power supply module, a control module and a storage module are further arranged inside the sealing housing. The control module comprises a controller, a clock circuit and a relay. The equipment which has relatively good sensing measuring precision performs effective automatic monitoring and recording on multiple bedding planes of a seabed and monitors in a way to switch from a single-point way to a multi-point way to form a stereoscopic monitoring face. Direct-viewing data are provided for submarine landslide researches. Information supports for natural disasters such as landslides, earthquakes, tsunamis, etc. and early warning services thereof are provided. Meanwhile, the equipment which has the characteristics of convenient operation and low cost can be used for underwater monitoring for a relatively long time.
Owner:THE FIRST INST OF OCEANOGRAPHY SOA
Testing device for simulating submarine landslide and testing method thereof
PendingCN108254504AEasy to operateImprove scientific research efficiencyMaterial analysisEngineering researchEngineering
The invention relates to a testing device for simulating a submarine landslide and a testing method thereof. The invention aims to provide the testing device for simulating the submarine landslide which is simple in structure and convenient in operation and the testing method thereof. Through the technical scheme, the testing device for simulating the submarine landslide is characterized in that the testing device is provided with a model casing; the model casing is provided with a glass face convenient to observe the internal situation of the model casing; the model casing is internally provided with a slantly arranged slide rail; the lower end of the slide rail is rotatably connected with a supporting plate; the supporting plate is fixed to the model casing; the upper end of the slide rail is connected to the model casing through a slide rail inclination adjusting mechanism; the upper surface of the slide rail is covered with a cushion layer; a mudflow generating mechanism for releasing mud is arranged above the upper part of the slide rail; and a monitoring mechanism for monitoring the state of the mud on the slide rail is arranged corresponding to the slide rail. The testing device is applicable for the field of ocean engineering research.
Owner:POWERCHINA HUADONG ENG COPORATION LTD
Apparatus and method for simulating submarine landslide resulting from gas hydrate dissociation or earthquake
ActiveUS20140227036A1Low mobilityStructural/machines measurementEducational modelsOcean bottomHydrate dissociation
Disclosed herein is an apparatus and method for simulating a submarine landslide. The apparatus includes an inclined flume; a plurality of sedimentary layers which are stacked on top of one another in the flume and tapped; water which is charged into the flume on the sedimentary layers in such a way that the surface of the water is formed in the flume; and a plurality of injectors which are provided in a bottom of the flume so as to be movable upwards or downwards with respect to the flume and inject gas or water into the sedimentary layer. The sedimentary layers are changed in pressure and temperature by the gas or water injected from the injectors into the sedimentary layers so that an artificial slope collapse is caused, whereby a water wave is generated in the flume.
Owner:KOREA INST OF GEOSCI & MINERAL RESOURCES
Submarine landslide evolution process simulating system and experimental method based on transparent soil and rotating water tank
PendingCN110657944AControllable scaleImprove economyHydrodynamic testingEarth material testingData ingestionSoil science
The invention relates to a submarine landslide evolution process simulating system and experimental method based on transparent soil and a rotating water tank, and belongs to the technical fields of marine geological disasters and geotechnical engineering experiments. The simulating system comprises a rotating water tank system, a transparent soil simulating system and a control and data collection system. The rotating water tank system sets different speeds for a sample by means of a control motor, and a closed circular ring structure of a U-shaped section rotary drum groove satisfies that the sliding distance is not limited; the transparent soil simulating system prepares a transparent sample, with a tracer coloring agent, and fluid environment whose physical mechanical property is the same with that of a real submarine soil layer, so that the internal, external and water-soil interface is visualized in a 3D way in the whole sample evolution process; and the control and data collection system realizes quantitative monitoring and data extraction of the evolution process by means of 3D laser slicing and digital image collection. The provided system is controllable in the scale, visualized in the evolution process, capable of measuring image data, and can solve the problems that a long-distance evolution experiment is hard to carry out, data acquisition is difficult, and a monitoring picture is not clear.
Owner:DALIAN UNIV OF TECH
Method for exploiting of submarine natural gas hydrate through solid replacement and pressure maintaining
ActiveCN108049846AAvoid decompositionMining principle is simpleConstructionsFluid removalEcological environmentSlurry
The invention discloses a method for exploiting of submarine natural gas hydrate through solid replacement and pressure maintaining, and belongs to the field of energy and environments. The method comprises the steps that by arranging a stope at a hydrate layer, the stope temperature and pressure are monitored by using a temperature and pressure sensor and fed back to an offshore platform, existing conditions of the hydrate are maintained by adopting a sealing device according to a hydrate temperature and pressure curve, the hydrate is made to be not disintegrated, the solid form of the hydrate is maintained, solid-state mechanization mining, solid-liquid slurry conveying, gas separation and liquefaction transport are further conducted on the hydrate, a separated hydrate skeleton is brokenagain, and a cavity is filled after a rapid solidification material is added, thus destroy of submarine landslide, tsunami and a submarine ecological environment can be effectively prevented, and thepurpose of green exploiting is achieved. According to the method for exploiting of the submarine natural gas hydrate through solid replacement and pressure maintaining, the system is simple, and themethod is suitable for a hydrate pressure bearing layer with an upper impermeable cover layer and a lower impermeable cover layer, and has a good application prospect.
Owner:CHINA UNIV OF MINING & TECH
A numerical simulation prediction method for seabed landslide induced by sea area natural gas hydrate decomposition
The invention belongs to the technical field of evaluation of influence of natural gas hydrate on environment. The invention discloses a numerical simulation prediction method and system for submarinelandslide induced by sea area natural gas hydrate decomposition, and the method comprises the steps: building a real natural gas hydrate system distribution model of a research area, predicting the upward movement depth of BSR when hydrate stabilization conditions are changed through the numerical simulation method, and determining the hydrate decomposition area and volume; based on a pore pressure calculation model, considering the volume change of the BSR underlying free gas along with the pressure before and after the hydrate is decomposed, and calculating the change of pore overpressure and effective stress in sediments caused by natural gas hydrate decomposition after the BSR is moved upwards; and mole-Coulomb strength criterion is used as a guide, and a finite element strength reduction method is adopted to calculate the stability safety coefficient of the slope, so that whether the submarine landslide can be induced by hydrate decomposition occurring when stable conditions arechanged is quantitatively predicted. The method has universality in other natural gas hydrate development areas.
Owner:CHINA UNIV OF PETROLEUM (EAST CHINA)
Test device and test method for simulating submarine landslide impact structure
ActiveCN110966951AAvoid deficiencies that deviate from realityAdjustable distanceEarth material testingUsing optical meansDynamic monitoringPhysical model
The invention relates to a test device and a test method for simulating a submarine landslide impact structure. The method is mainly used for researching impact effect and the damage effect of the structure after undersea landslide instability damage. The device comprises four parts of a frame system, a lifting system, a soil bin system and a test system. A support protection and test space is provided for the whole device through the frame system. Angle adjustment of the slide way within a certain range is achieved through the lifting system. Stable storage and rapid release of simulated landslide substances are achieved through the soil bin system, and dynamic monitoring of the structure strain distribution rule and the change process in the landslide impact process is achieved through the test system. According to the invention, the actual damage phenomena of quick start and hydroplaning migration of the submarine landslide are fully restored, the influence of the distance between the structure and the submarine landslide on the impact effect is fully considered, the distance-adjustable physical model test device for the submarine landslide impact structure is realized, and thedefects of theoretical calculation and numerical simulation are avoided.
Owner:POWERCHINA HUADONG ENG COPORATION LTD
Experimental device suitable for simulating submarine landslide caused by combustible ice exploitation
ActiveCN109386283APowerfulRealize real-time monitoringBorehole/well accessoriesOcean bottomControl system
The invention discloses an experimental device suitable for simulating a submarine landslide caused by combustible ice exploitation. The experimental device consists of a water tank system, a bracketsystem, a combustible ice exploitation system, a measuring and observing system and a control system, wherein the bracket system is arranged at the upper portion of the water tank system, the combustible ice exploitation system is connected to the bracket system through a movable clamping plate, and the measuring and observing system and the control system are separately positioned at the periphery of the water tank system; the measuring and observing system is used for recording submarine stratum signals and submarine landslide information in a combustible ice exploitation process, and the control system is used for controlling each system activity in the combustible ice exploitation process. According to the experimental device, the blank in the field of physical simulation of submarinestability influenced by combustible ice exploitation is filled; through cooperation among the systems, the whole process of submarine slope instability caused by the submarine combustible ice exploitation can be accurately simulated. The experimental device has important guiding significance on safe development and efficient utilization of submarine combustible ice.
Owner:PEKING UNIV
Transparent soil deformation visualization system for simulating submarine landslide
InactiveCN109541174ASimple structureSave human effortMaterial analysis by optical meansEarth material testingVacuum pumpingLaser transmitter
The invention provides a transparent soil deformation visualization system for simulating a submarine landslide, which comprises a transparent model test box, a model template, a CCD camera and a laser emitter, wherein the transparent model test box comprises a rectangular box body and a sealing cover; the sealing cover can seal the upper end opening of the rectangular box body; a vacuum pumping valve is arranged on the sealing cover; the model template has a plate-shaped structure as a whole; the model template and the inner wall of the rectangular box body form transparent soil space in a surrounding mode; a transparent soil slope body is arranged in the transparent soil space; and the CCD camera and the laser emitter are arranged outside the rectangular box body. The system can observethe landslide process, the structure is simple, and little manpower and few material resources are consumed in a single test.
Owner:CHONGQING UNIV
Device for underwater landslide detection
The invention provides a device for underwater landslide detection. The device comprises a monitor end, a process end and a connection end, wherein the outside of the monitor end is provided with a plurality of sealed watertight protective layers, the inside of the monitor end is provided with a cavity, the cavity is provided with a MEMS sensor and sonar and damping disc, the MEMS sensor and sonar are fixedly on the cavity through the damping disc, the connection end comprises cable, one end of the cable is connected to the MEMS sensor and sonar in the monitor end, the other end of the cable is connected to the process end to transfer the data obtained from the monitor end to the process end and the cable is also used for supplying power to the monitor end. The process end comprises a data processor and a power module. The device is capable of effectively detecting the underwater landslide condition.
Owner:OCEAN UNIV OF CHINA +1
A kind of submarine landslide monitoring device and monitoring method based on mems sensor
InactiveCN105674945BReduce initial errorReal-time animation displayMeasurement devicesOcean bottomEngineering
Owner:ZHEJIANG UNIV
Seabed landslide evaluation method based on indoor test
ActiveCN111157699AObserve the destruction processLow initial strengthEarth material testingSoil scienceSoft clay
The invention discloses a seabed landslide evaluation method based on an indoor test. The method comprises preparation of structural soft clay and the indoor test. The preparation of the structural soft clay comprises the following steps: doping silicate 525 cement into marine soft soil, adding water to 2 times the liquid limit of a soil body, and uniformly stirring under a vacuum condition, thereby obtaining the structural soft clay, wherein the addition amount of the silicate 525 cement is 2% of the mass of the soft soil particles; the indoor test is realized based on a novel indoor test device for simulating seabed landslide. The device comprises a model box main body, a false slope, a funnel, a soil cutting plate, a sensor bracket and a portal frame lifting device. According to the method, test simulation of the submarine landslide with multiple slope angles and multiple working conditions can be achieved, the method can be combined with an indoor large section wave gutter channel,and the influence of the coupling effect of waves, slope toe scouring and rapid deposition on the submarine landslide is systematically researched, and the systematic method for evaluating the stability of the submarine landslide is obtained.
Owner:ZHEJIANG UNIV
A visual test device for mechanical properties of natural gas hydrate deposits
ActiveCN104155188BGood X-ray penetrationX-ray penetration performance guaranteeMaterial strength using tensile/compressive forcesOcean bottomDecomposition
Owner:DALIAN UNIV OF TECH
Computer method for predicting landslide vertical impact acting force on submarine pipeline
PendingCN111210502APrediction is accurateGood application effectDesign optimisation/simulation3D modellingClassical mechanicsSeabed sediment
The invention discloses a computer method for simulating landslide vertical impact force borne by a submarine pipeline. According to the technical scheme, the method is characterized by comprising thesteps that 1, a three-dimensional model of the landslide vertical impact force borne by the subsea pipeline is established; 2, mesh generation is performed on the three-dimensional model, a non-repeated control volume exists around each mesh point, and a result is solved by utilizing a calculation equation; 3, model parameters are determined according to seabed sediment sampling and testing of the seabed landslide pre-judgment area; and 4, the obtained parameters are input into the model established in the step 2. The method provides technical reference for prediction and disaster preventiondesign of landslide disaster acting force on the submarine pipeline.
Owner:WENZHOU UNIVERSITY
Method for predicting impact force of submarine landslide collapse block on submarine pipeline
ActiveCN112734081AStrong processEasy to useForecastingDesign optimisation/simulationStructural engineeringSubmarine pipeline
The invention relates to a method for predicting the impact force of a submarine landslide collapse block on a submarine pipeline, and the method comprises the steps: the cohesive force and internal friction angle of a soft soil body are gradually reduced below a hard layer under the action of a wave cyclic load to a critical value, the submarine landslides, the hard layer slides downwards and is torn into a collapse block, and slides towards the downside of a slope; firstly, the bottommost collapse block impacts the submarine pipeline, the instant impact force of the collapse block impacting the submarine pipeline is determined according to the momentum theorem, after the impact force is completed, the collapse block acts on the submarine pipeline in a static thrust mode, then the second row of collapse blocks impact the first row of collapse blocks, and the impact force acts on the submarine pipeline; and after the impact force is finished, the first row of collapsed blocks and the second row of collapsed blocks act on the submarine pipeline in a static thrust mode until the last row of collapsed blocks impact the submarine pipeline, and force in two modes of instant impact force and static thrust acts on the submarine pipeline.
Owner:FUJIAN UNIV OF TECH
Streamlined energy pipeline capable of relieving submarine landslide impact
PendingCN107091379AAvoiding the Risk of ResonanceImprove the protective effectSynthetic resin layered productsCoatingsOcean bottomResonance
The invention belongs to the technical field of production of submarine energy pipelines, and relates to a streamlined energy pipeline capable of relieving submarine landslide impact. A streamlined type is applied to a concrete weight coating on the outermost part of the traditional submarine pipeline structure, the interior structure of the traditional energy pipeline is retained, the cross section of the energy pipeline is streamlined, and except a concrete layer, other layers are consistent to a current engineering standard. The drag force and the lift force on the pipeline can be obviously smaller than the drag force and the lift force on the traditional pipeline with a circular cross section, the impact effect of submarine landslide is reduced effectively, meanwhile, a continuous oscillating lift force is transformed into a stabilizing effect, the risk of resonance of the pipeline is prevented effectively, and the disaster reduction effect is remarkable; and by the design, the disaster reduction effect on accidental load such as submarine landslide is good, and the protection effect on environmental load of flowing bodies such as bottom flow and sand wave is also good. In addition, the streamlined energy pipeline capable of relieving submarine landslide impact does not affect delivery amounts of oil, gas and water in current engineering, a production process of the pipeline does not need to be changed on a large scale either, and therefore, popularization and actual application are facilitated.
Owner:DALIAN UNIV OF TECH
Variable-frequency vibration exploitation method of offshore gas hydrate
InactiveCN104929601AControl speedControl rangeFluid removalVibration devicesOcean bottomDecomposition
The invention discloses a variable-frequency vibration exploitation method of offshore gas hydrate and belongs to the technical field of offshore resource exploitation. The variable-frequency vibration exploitation method includes steps of drilling a methane gas hydrate reservoir layer via an offshore drilling rig, releasing stress energy to promote decomposing of gas hydrate by a vibrator at the top of a drill pipe, gathering the decomposed methane gas around drilling holes and enabling the methane gas to move upwards along the drill holes by means of natural pressure difference of the hydrate decomposing area and the drill holes; controlling rising speed of the methane gas, and collecting the methane gas from the drill holes to the drilling rig by a collector and storing. By adjusting energy of the vibrator, different frequencies of excitation energy are applied according to different saturation degrees of methane reservoir layers, the vibration energy can be adjusted according to decomposition of the methane gas, and decomposing speed and range of the gas hydrate can be effectively controlled; disasters such as unordered seabed landslide due to changes of depositional conditions are avoided.
Owner:NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
SPH simulation display method and system for whole submarine landslide catastrophe evolution process
PendingCN113761775AEffective simulationEffective visualizationDesign optimisation/simulationClassical mechanicsEngineering
The invention discloses an SPH simulation display method and system for a whole submarine landslide catastrophe evolution process. The method comprises the following steps: dispersing a calculation region of a submarine slope body and seawater into a set number of particles with different physical state attributes, and endowing each physical state particle with corresponding physical and mechanical parameters; on an outer side of a boundary, arranging a non-slip boundary layer in which repulsive particles and virtual particles are combined; applying infinite covering seawater gravity and periodic wave action to seawater particles, converting land slope acting force and structural acting force borne by the slope body into stress boundary conditions of a slope body particle calculation area, applying the stress boundary conditions to boundary particles composed of the repulsive particles and the virtual particles, and applying displacement boundary conditions; in each calculation time step, determining a catastrophe evolution stage of the submarine slope body, selecting a system constitutive equation set corresponding to the catastrophe evolution stage, carrying out calculation solving in the single time step, and completing updating of particle physical and mechanical information of a solving domain; and displaying the particle physical and mechanical information at set time steps.
Owner:SHANDONG UNIV
Testing device for monitoring submarine landslide mass transportation process, and test method
The invention discloses a testing device for monitoring submarine landslide mass transportation process, and a test method, and belongs to the technical field of the ocean engineering. Based on a critical shear stress starting condition, an equivalent simulation method is adopted, a testing device for monitoring the transportation of the submarine landslide body to the water environment is provided, and a test method for effectively testing and analyzing the characteristic parameters of the submarine landslide mass transportation process is provided according to the establishment and parameterconversion of an equivalent simulation relation and a test calibration relation. The testing device provided by the invention can monitor a change condition of the submarine landslide mass transportation process in real time, the parameters are convenient to obtain, and the data volume is rich; the test method is full in theory, convenient to popularize and beneficial to landslide hazard evaluation and engineering facility design work in ocean engineering; in addition, the method can be applied to the research of the mass transportation characteristics in the submarine landslide motion process and the research of the marine geological problems such as submarine sand waves, submarine sediment resuspension and the like.
Owner:DALIAN UNIV OF TECH +1
Submarine landslide simulation system and test method based on wave vibration effect
PendingCN111076895AOvercome theoretical calculationsOvercoming the shortcomings of numerical simulationHydrodynamic testingMaterial strength using repeated/pulsating forcesWave simulationStructural engineering
The invention relates to a submarine landslide simulation system and test method based on a wave vibration effect, which are mainly used for researching dynamic response of submarine landslide under the wave vibration effect and revealing an inoculation mechanism and a damage mechanism of the submarine landslide. The system structurally comprises a frame supporting structure, a landslide simulation device, a wave simulation device and a landslide monitoring device. The landslide simulation mechanism comprises a simulation landslide body and an inclination angle adjusting mechanism, the wave simulation mechanism comprises a vibration excitation plate and a vibration excitation driving mechanism, and the landslide monitoring device comprises a pore pressure monitoring meter and a displacement sensor. According to the invention, the important effect of the wave load in the submarine landslide is fully considered, the defects of large harbor basin tests and theoretical numerical calculation are greatly overcome, and the system and the test method can be used for revealing an inoculation mechanism and a damage mechanism of the submarine landslide under the action of the wave load.
Owner:POWERCHINA HUADONG ENG COPORATION LTD
Apparatus and method for simulating submarine landslide resulting from gas hydrate dissociation or earthquake
InactiveUS9068309B2Structural/machines measurementEducational modelsOcean bottomHydrate dissociation
Disclosed herein is an apparatus and method for simulating a submarine landslide. The apparatus includes an inclined flume; a plurality of sedimentary layers which are stacked on top of one another in the flume and tapped; water which is charged into the flume on the sedimentary layers in such a way that the surface of the water is formed in the flume; and a plurality of injectors which are provided in a bottom of the flume so as to be movable upwards or downwards with respect to the flume and inject gas or water into the sedimentary layer. The sedimentary layers are changed in pressure and temperature by the gas or water injected from the injectors into the sedimentary layers so that an artificial slope collapse is caused, whereby a water wave is generated in the flume.
Owner:KOREA INST OF GEOSCI & MINERAL RESOURCES
Seabed slope post-earthquake stability analysis method based on in-situ monitoring
ActiveCN114065504ADesign optimisation/simulationSpecial data processing applicationsOffshore oil and gasShear band
The invention provides a method for evaluating the stability of a seabed slope under the earthquake action based on in-situ monitoring. The method is used for evaluating the stability of a seabed landslide after an earthquake. By means of the method, under the condition that only a small amount of displacement in-situ monitoring equipment needs to be arranged, according to the displacement monitoring result, the seabed slope earthquake response process under the earthquake action is inverted, the seabed slope potential slip band strength reduction amount is calculated, the shear band expansion theory is combined, and the seabed slope stability after the earthquake action can be judged. The method is economical, feasible and theoretical, and can be used for submarine stability monitoring of ocean engineering such as submarine pipelines, offshore oil and gas platforms, offshore wind power and the like.
Owner:ZHEJIANG HUADONG CONSTR ENG +1
Natural gas hydrate mining method
InactiveCN113107433AImprove securityStrong formation rigidityFluid removalMineralogyPetroleum engineering
The embodiment of the invention discloses a natural gas hydrate mining method. The method comprises the steps that free gas in a natural gas hydrate mineral deposit is mined in a pressure reduction mining mode till the pressure of the natural gas hydrate mineral deposit is reduced to the preset percentage above the equilibrium pressure corresponding to the temperature of the hydrate mineral deposit, and the value range of the preset percentage is 5% to 10%; the temperature of the hydrate mineral deposit is reduced and kept below the freezing point, and thus free water in the mineral deposit is frozen; after the pressure and the temperature of the mineral deposit are stable, natural gas hydrate is mined; after mining of the natural gas hydrate is finished, CO2 is injected into the mineral deposit; and when CO2 injection is stopped, the temperature of the mineral deposit is increased to the freezing point or above. By utilizing the natural gas hydrate mining method, energy needed by mining can be reduced, the natural gas hydrate is mined safely in an environment-friendly mode, the stratum stability can be enhanced, and geological disasters such as stratum collapse and seabed landslide which possibly occur in the conventional mining process are effectively avoided.
Owner:CHINA UNIV OF PETROLEUM (BEIJING)
Submarine landslide process simulation method and system
PendingCN113761774AEffectively describe the handling processDetermine the size of the slippageDesign optimisation/simulationCAD numerical modellingClassical mechanicsRelative motion
The invention provides a submarine landslide process simulation method and system. The method comprises the following steps: carrying out meshless discretization on a submarine landslide body simulation region, constructing a landslide body particle model, and initializing physical and mechanical parameter values of the landslide body particles; constructing an adjacent particle tight branch domain of the landslide body particles, traversing the landslide body particles in the adjacent particle tight branch domain in each time step length to obtain a relative motion state among the landslide body particles and a stress tensor state of the landslide body particles, so as to judge a critical state of the landslide body particles and select a corresponding constitutive equation; according to the constitutive equation, obtaining a prediction-correction cycle result of a solid-liquid boundary density and pressure intensity, obtaining a density change rate, a stress change rate, and a momentum change rate of the landslide body particles, updating physical and mechanical parameter values of the landslide body particles according to the density change rate, the stress change rate and the momentum change rate of the landslide body particles, and within a set time step length, realizing effective simulation of the sliding and accumulation catastrophe process of a landslide body after a submarine landslide disaster occurs.
Owner:SHANDONG UNIV
Simulation experiment device and method for submarine landslide induced by natural gas hydrate decomposition
PendingCN113009109AIntuitive geometryIntuitive featuresConstructionsEarth material testingCollection analysisSoil science
The invention provides a simulation experiment device and method for submarine landslide induced by natural gas hydrate decomposition, relates to the technical field of marine geological disasters and natural gas hydrate exploitation, and realizes dynamic observation of the submarine landslide process. The device comprises a model box body, a gas injection system, a landslide system, an observation system and a data acquisition and analysis system, the model box body provides a test platform and facilitates observation, the gas injection system simulates the process that natural gas hydrate is decomposed to release a large amount of methane gas through gas injection, and the landslide system is connected with the gas injection system. The landslide system comprises a permeation box, a clay layer and a simulated hydrate layer and is used for simulating a submarine landslide process, and the observation system records the simulated landslide process and monitors strain and stress changes in the landslide process; and the data acquisition and analysis system collects monitoring information of the pressure sensor and the high-speed camera. The device can be used for observing the dynamic process of hydrate-induced submarine landslide, and has the advantages of simplicity and convenience in operation, low cost and the like.
Owner:SHANDONG UNIV OF SCI & TECH
Wave maker for submarine landslide physical model test and working method
InactiveCN111141484ATo meet manufacturing needsImprove applicabilityHydrodynamic testingEducational modelsMarine engineeringAcute angle
The invention relates to a wave maker for a submarine landslide physical model test and a working method. The wave maker comprises a bottom support, a vertically-arranged sliding rail is arranged on atop face of the bottom support, the sliding rail is slidably connected with a wave-making water tank; a top tank wall of the wave-making water tank is hinged with one end of a connecting rod; the other end of the connecting rod is hinged with a sliding block arranged on a swing arm; the sliding block is connected with an amplitude modulation driving piece arranged on the swing arm; the amplitudemodulation driving piece can drive the sliding block to move in the axis direction of the swing arm. The swing arm is connected with a driving mechanism; the driving mechanism is mounted on a top support which is fixedly arranged; the driving mechanism can drive the swing arm to rotate, the swing arm rotates to drive the wave-making water tank to move along the sliding rail through the connectingrod, the area of a top tank wall of the wave-making water tank is larger than that of a bottom tank wall, a side tank wall on one side of the wave-making water tank and the horizontal plane form an acute angle, and the wave maker can produce different types of waves and is high in applicability.
Owner:POWERCHINA HUADONG ENG COPORATION LTD +1
Seabed combustible ice exploiting system
The invention discloses a seabed combustible ice exploiting system, and solves the problems of natural disasters and pollution in the exploiting process. The seabed combustible ice exploiting system is characterized by comprising a drilling well, a pipeline system, a camera system, a control system, a gas concentration sensor, a gas-liquid separator, a gas collecting device, a micro-interface generator and a mixer main body. The micro-interface generator generates micro-bubbles and / or micro-droplet emulsion required by exploitation; then, the micro-bubbles and / or micro-droplet emulsion are / isinjected into the mixer main body and fully mixed with gas or liquid in the mixer main body for reaction; a final product is conveyed to a seabed combustible ice layer through the pipeline system; andcombustible ice is decomposed to be in a liquid state or a solid state to realize exploitation. Meanwhile, in order to avoid seabed landslide or explosive pressure release after the combustible ice exploitation, carbon dioxide is converted into carbon dioxide hydrates through the micro-interface generator and the mixer main body after the exploitation, and the carbon dioxide hydrates are conveyedto the seabed to occupy the original space of the combustible ice.
Owner:NANJING YANCHANG REACTION TECH RES INST CO LTD
Submarine landslide deep deformation in-situ real-time monitoring device and analysis method
ActiveCN113624195AHigh precisionReduce mistakesOpen water surveyGeological measurementsInformation transmissionAccelerometer
The invention discloses a submarine landslide deep deformation in-situ real-time monitoring device and analysis method, the device comprises a long hose, a monitoring unit, a processing unit and an upper computer, the monitoring unit comprises a plurality of monitoring subunits, and the processing unit comprises a data processor; and the monitoring subunits are installed in the long hose in the length direction of the long hose, the two ends of the long hose are sealed, each monitoring subunit comprises two mutually orthogonal MEMS accelerometers, the MEMS accelerometers in the long hose are connected with the data processor, and the data processor is connected with the upper computer. The device has the advantages that when the seabed stratum around the device changes, the long hose is driven to bend and move, the MEMS accelerometer can move along with the overall movement of the device, the accelerometers at different levels can transmit own attitude information to the data processor, and the attitude information is analyzed and processed by the data processor and transmitted to the upper computer; and finally, the upper computer carries out visualization processing, and reconstructs and displays the stratum deep displacement deformation information.
Owner:海南浙江大学研究院 +1
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