AU2021103583A4 - Device and experimental method for simulating the effect of submarine tidal sand waves on pipeline engineering - Google Patents
Device and experimental method for simulating the effect of submarine tidal sand waves on pipeline engineering Download PDFInfo
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- 239000004576 sand Substances 0.000 title claims abstract description 110
- 230000000694 effects Effects 0.000 title claims abstract description 18
- 238000002474 experimental method Methods 0.000 title claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 64
- 238000012545 processing Methods 0.000 claims abstract description 33
- 239000000835 fiber Substances 0.000 claims abstract description 15
- 238000005259 measurement Methods 0.000 claims abstract description 15
- 238000004088 simulation Methods 0.000 claims abstract description 12
- 239000000523 sample Substances 0.000 claims description 13
- 238000012876 topography Methods 0.000 claims description 4
- 230000007423 decrease Effects 0.000 claims description 3
- 230000000994 depressogenic effect Effects 0.000 claims description 3
- 238000013480 data collection Methods 0.000 claims 4
- 230000015572 biosynthetic process Effects 0.000 abstract description 6
- 238000006073 displacement reaction Methods 0.000 abstract 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 72
- 238000002604 ultrasonography Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 230000000737 periodic effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 238000012067 mathematical method Methods 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000013049 sediment Substances 0.000 description 2
- 239000006004 Quartz sand Substances 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 230000002301 combined effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 230000001020 rhythmical effect Effects 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M99/00—Subject matter not provided for in other groups of this subclass
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B17/00—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations
- G01B17/06—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations for measuring contours or curvatures
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C11/00—Photogrammetry or videogrammetry, e.g. stereogrammetry; Photographic surveying
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/24—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet
- G01L1/242—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet the material being an optical fibre
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- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
Abstract
The invention discloses a device and experimental method for simulating the effect of
submarine tidal waves on pipeline engineering, which includes an experimental water tank and
tide generation system, a terrain scanning system, a submarine pipeline simulation
measurement system, and a data acquisition processing and controller. The experimental tank
and tide generation system create reciprocal tidal flows using pumps to act on the sandy seabed
in order to generate submarine sand waves. The terrain scanning system uses an ultrasonic
topographer to collect the sand wave pattern and transmit the data to the data acquisition
processing and controller; the submarine pipeline simulation measurementsimulation
measurement system uses the fiber optic strain sensors, which are stuck on the side wall of the
pipeline model, to collect the pipeline deformation data, and uses a high-speed camera to
collect the pipeline displacement information and transmit the information to the data
acquisition processing and controller. In this invention, the periodically changing flow, instead
of steady flow or waves in former experiments, is generated with a pump to simulate the tidal
flows and then to simulate the formation of tidal sand waves. This device can be used to conduct
experiments on the impact of submarine tidal sand waves on pipeline engineering with realistic
conditions and high accuracy.
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Device and experimental method for simulating the effect of submarine tidal
sand waves on pipeline engineering
The present invention relates to the field of ocean engineering, sediment transport,
ocean measurement, and in particular to an device and experimental method for
simulating the effect of submarine sand tidal waves on pipeline engineering.
With the development of offshore oil and gas resources, submarine pipelines have
become the main way of offshore oil and gas transportation. Submarine sand waves are
large rhythmic bedforms developed on sandy bottoms on continental shelves, with
characteristic wavelengths ranging from tens of meters to hundreds of meters and wave
heights reaching a few meters or more. Ocean observation data show that the tidal
current is one of the main reasons for the formation of submarine sand waves. The
seabed sand waves are generally active. Under certain circumstances, the submarine
sand waves will move rapidly and cause the exposure or suspension of the submarine
pipeline, which will eventually lead to the fatigue damage of the submarine pipeline.
Therefore, it is of great engineering significance and scientific value to study the
submarine sand wave activity and the pipeline spans caused by it.
Current research on submarine sand waves mainly relies on in-situ observations
and mathematical methods. Generally, in-situ observations are costly and the
observation period is usually long, while mathematical methods are simplified models
that cannot fully simulate the transient process of sand wave activity and also need experimental results to verify the correctness of the models. Thus, laboratory simulation is effective and necessary method to research the submarine sand waves. At present, the laboratory mainly uses waves or unidirectional flow to simplify the reciprocal tidal flows, but the obtained topography scale is very small, the wavelength is only a few centimetres long, which essentially is in the category of sand ripples (a kind of smaller topography than sand waves), which is not the real sense of the tidal sand waves.
In order to solve the above technical problems, the present invention provides a
device and experimental method for simulating the impact of submarine tidal sand
waves on pipeline engineering, using a variable frequency controller to control a
two-way variable frequency pump to realize the periodic change of water flow,
simulating the real tidal reciprocating flow, and combining the initial artificial terrain
interference to simulate the formation of tidal sand waves, further simulating the impact
of sand waves on submarine pipelines, the collecting data is real and high reference
value.
An device for simulating the effect of submarine tidal sand waves on pipeline
engineering, including an experimental water tank and tidal generation system, a terrain
scanning system, a submarine pipeline simulation measurement system and a data
acquisition processing and controller.
The experimental water tank and tide generation system includes a water tank, a
circulation pipe, a gently sloping sand pit, a two-way variable frequency pump, a variable frequency controller and a flow rate meter; the gently sloping sand pit is set in the middle of the water tank, and its two ends are raised and the middle is depressed to form a cavity for holding sea sand, while the raised part is provided with a gentle slope near the end of the water tank, and the height of the gentle slope gradually decreases.
The circulation pipe is installed on the lower side of the water tank, and its inlet and
outlet ends are respectively installed on the bottom surfaces of two opposite ends of
the water tank; the gently sloping sand pit is filled with sea sand; the two-way inverter
pump is installed on the circulation pipe, and the inverter controller is connected to
the two-way inverter pump and data acquisition processing and controller,
respectively, and can control the two-way inverter pump according to the commands
of data acquisition processing and controller working; the flow velocity meter is
installed inside the water tank, which is connected to the data acquisition processing
and controller.
The terrain scanning system comprises an ultrasound topographer, a connecting
rod and a motion device. The ultrasound topographer's probe is mounted on the
connecting rod, the connecting rod is mounted on the motion device and its motion
trajectory is controlled by the motion device; the connecting rod is capable of
changing the position of the ultrasound topographer's probe by means of telescoping;
the ultrasound topographer is connected to the data acquisition processing and
controller;
The submarine pipeline simulation measurement system includes a pipeline
model, a counterweight, a fiber optic strain sensor and a high speed camera; the high speed camera is mounted above the water tank and connected to the data acquisition processing and controller for photographing the shape of the sandy bed in the sand pit; the pipeline model is placed in the sand pit, which is partially or fully buried in the sea bed. The pipe model is provided with a counterweight inside; the fiber optic strain sensors are fixed longitudinally on the side wall of the pipe model with a certain interval and connected to the data acquisition processing and controller for detecting the strain data of the pipe model.
Further, the movement device includes a track on the side wall of the water tank,
a roller device capable of moving along the track, and an electric motor driving the
roller device.
Further, the circulation pipe is parallel to the long side of the water tank.
Further, the cross-section of the gentle slope is a class of right triangle with a
ratio of height to bottom side of 1:25 to 1:15.
Further, there are four strings of the fiber optic strain sensors, which are
distributed along the axis of the pipe model and are evenly distributed around the
circumference of the pipeline model with 90°.
Further, the pipe model is a PVC pipe.
Further, the counterweight is water or sea sand.
An experimental method for simulating the effect of submarine tidal sand waves
on a submarine pipeline, comprising the following steps:
1 Loading sand samples into gently sloping sand pits, then leveling the sand
surface in general and processing local areas of the sand surface into tiny bumps or
grooves.
2 Slowly injecting water into the water tank to reach the depth required for the
experiment without disturbance of the state of the sand sample in the sand pit.
3 Using the variable frequency controller to preset the period and maximum flow
rate of reciprocating flow and control the two-way frequency pump to form
reciprocating flow in the water tank.
4 Using flow velocity meters and ultrasonic topographer probes to collect the
morphology of the sea bed and transmit the collected data to the data acquisition
processing and controller (In practice, the data acquisition processing and controller is
often a computer).
5 When the sand sample forms a simulated submarine sand wave, empty the
water in the tank, lay the pipe model on the submarine sand wave, refilling water to
the original height, and create reciprocal flows in the tank to simulate the tidal flows.
6 Using flow velocity meter, ultrasonic topographer, high-speed camera and fiber
optic strain sensor, the water flow velocity, the morphology of the sea bed and the
movement and deformation of the submarine pipeline are observed synchronously;
and the collected data are transmitted to the data acquisition processing and controller
for analysis and processing.
The device to simulate the impact of submarine tidal sand waves on pipeline
engineering uses a variable frequency controller to control bi-directional variable frequency pumps to realize the periodic change of water flow, simulate the real tidal reciprocal flow, and combine the initial artificial terrain interference to simulate the formation of tidal sand waves, and further simulate the sand waves and their impact on submarine pipelines, with real conditions and high accuracy.
Figure 1 is a schematic diagram of the structure of the device provided by the
present invention for simulating the effect of submarine tidal sand waves on pipeline
engineering.
Figure 2 shows a schematic diagram of the structure of the submarine pipeline
simulation and measurement system 3.
Figure 3 shows an enlarged view of the side view of Figure 2.
The technical solutions of the present invention are described in detail below in
conjunction with the accompanying drawings and specific embodiments.
An device for simulating the effect of submarine tidal sand waves on pipeline
engineering, including an experimental water tank and tidal generation system 1, a
terrain scanning system 2, a submarine pipeline simulation measurement system 3 and
a data acquisition processing and controller 4.
The experimental water tank and tide generation system 1 includes a water tank
11, a circulation pipe 12, a gentle slope sand pit 13, a two-way variable frequency water
pump 14, a variable frequency controller 15 and a flow velocity meter 16; the gentle
slope sand pit 13 is set in the middle of the water tank 11, the two ends of which are raised and the middle is depressed to form a cavity for holding sea sand, while the raised part is connected to the bottom of the water tank through a gentle slope 17, the height of the gentle slope 17 gradually decreases; specifically, the cross-section of the gentle slope 17 is a right-angle triangle-like, and the ratio of the height to the bottom edge is 1:25 to 1:25, and as an embodiment of the present invention, the ratio of the height to the bottom edge is 1:20; The circulation pipe 12 is set on the lower side of the water tank 11, and its inlet and outlet ends are set on the bottom surfaces of the two opposite ends of the water tank 11; the gently sloping sand pit 13 is filled with sea sand.
Preferably, the surface of the sea sand is flat as a whole and is machined into a
mound-like disturbence at a local level; as an embodiment of the present invention, the
gently sloping sand pit 13 is rectangular, and the circulation pipe 12 is parallel to the
long side of the gently sloping sand pit 13; Two-way variable frequency water pump 14
is installed on the circulation pipe 12, and the variable frequency controller 15 is
connected to the two-way variable frequency water pump 14 and the data acquisition
processing and controller 4, respectively, and can control the two-way variable
frequency water pump 14 according to the instructions of the data acquisition
processing and controller 4; the flow velocity meter 16 is installed inside the water tank
11, and it is connected to the data acquisition processing and controller 4 to transmit to
it the water flow velocity inside the water tank 11.
The terrain scanning system 2 includes an ultrasonic topographer, a connecting
rod 22 and a motion device 23; the probe 21 of the ultrasonic topographer is mounted
on the connecting rod 22, and the connecting rod 22 is mounted on the motion device
23, and the motion trajectory is controlled by the motion device 23; the connecting rod
22 can change the position of the probe 21 of the ultrasonic topographer by means of
telescoping; the ultrasonic topographer is connected to the data acquisition processing
and controller 4.
The submarine pipeline simulation measurement system 3 includes a pipeline
model 31, a counterweight 33, a fiber optic strain sensor 32, and a high-speed camera
34; the high-speed camera 34 is installed above the water tank 11 and connected to the
data acquisition processing and controller 4 for photographing and transmitting back
the morphology of the sea sand 13 in the gently sloping sand pit; the pipeline model 31
is placed in the gently sloping sand pit 13, which is partially or completely buried by the
sea sand; preferably, the pipeline The pipe model 31 is a PVC pipe; the pipe model 31 is
provided with a counterweight 33 inside; preferably, the counterweight 33 is water or
sediment. The fiber optic strain sensor 32 is fixed on the side wall of the pipe model 31
and is connected to the data acquisition and processing and controller 4 for transmitting
the measured strain data of the pipe model 31 back. Specifically, there are multiple
fiber optic strain sensors 32, which are distributed axially in multiple locations of the
pipe model 31 and uniformly distributed circumferentially at each location; preferably,
there are four evenly distributed circumferentially at each location.
As an embodiment of the present invention, the movement device 23 includes a
track set on the wall of the tank 11, a roller device that can move along the track, and a
motor that drives the movement of the roller device.
The technical solution has the following characteristics:
(a) Simulation of tidal field using reciprocating flow
At the present stage in the laboratory tank experiments, waves or one-way flow is
used to simulate the tidal flow, acting on the sea bed to form sand waves. The
limitations are: the period of waves is a few seconds, while the period of the simulated
tide needs at least a few hours, and the difference between the two periods is
significant; if one-way flow is used, it does not reflect the period change characteristics
of the tidal flow. Therefore, the wave-like landforms currently formed in the laboratory
are small in size (only a few centimeters) and are essentially sand ripples (a much
smaller bed form), rather than true tidal sand waves. And thefield observation data
shows that the periodic action of tidal waves is one of the main reasons for the
formation of sand waves. Therefore, the present invention will use the flume and the
tidal generation system to generate a large period of reciprocal flow (period of about 2
hours) to simulate the tidal field. The generation of reciprocating flow requires the
flume to be equipped with a variable frequency pump and a variable frequency
controller to control the size and period of the reciprocating flow, which is the major
difference between the present invention and the previous sand wave simulation
experiments.
(b) Initial artificial terrain disturbance incorporated
After repeated attempts, the inventors found that on a flat seabed, even if
reciprocating currents are applied to simulate the tidal field, no tidal sand waves are
formed. Only with artificial terrain disturbance, i.e., setting some small bumps and
grooves artificially in the local position of the seabed after leveling so that the local bed becomes uneven to trigger the instability of the seabed, the tidal sand wave will be formed. The height of these preset artificial terrain disturbances is generally about 5 cm, and the length needs to be varied within a certain range (e.g., from 0.5 m to 5 m).
For operational simplicity, these artificial terrain disturbances can be set in triangular
shapes. In this way, under the combined effect of the tidal current and the initial
artificial terrain disturbance, the seabed will gradually develop and form the sand wave
geomorphology. In the experiment, without the addition of the initial artificial terrain
disturbance, the sand wave will not be formed, and this step is also the key operational
step of the current invention.
(c) sand wave topography automatic scanning system
Due to the large terrain extent of the sand-wave seabed in the experiment and the
single-point measurement method of the ultrasonic topographer, continuous scanning
of the entire seabed was required to obtain terrain data for the entire experimental area.
A terrain scanning system was designed to perform reciprocal scanning measurements
over the entire test area using a motion device. This running system allows setting the
scanning range, the speed of movement, and the distance of each step.
(d) Non-contact measurement of pipe motion and strain
The conventional submarine pipeline motion measurement method is mostly
contact measurement, which affects the structural distribution of the flow field. In this
device, a high-speed camera is used to record the motion of the submarine pipe from the
outside of the water tank. In the post-processing stage, the motion image is processed to
obtain the position change of the submarine pipe. A fiber-optic grating strain sensor is placed on the surface of the submarine pipe to measure the strain of the structure. Since the fiber optic strain sensor has a diameter of only 0.2 mm, it does not affect the structural properties after being attached to the surface of the submarine pipe, and the fiber optic strain is a dynamic strain measurement with a high acquisition frequency (up to 1000 Hz), so the strain measurement results are highly accurate.
Experimental method
1 . The formation of tidal sand waves
1) Suitable sand samples were selected, (e.g., quartz sand with a median grain
size of 0 .28 mm was used in this method), and the surface was leveled after filling in
the gently sloping sand pit 13. The initial artificial terrain disturbance was set locally
on the leveled sand surface, i.e., different triangular bumps were scraped out using a
template, with a height of about 5 cm and a length between 0 .5m and 5m. This step is
also the key to the success or failure of the whole experiment.
2) Slowly fill the water tank 11 and reach the depth required for the experiment,
taking care not to destroy the initial artificial terrain disturbance set up.
3) Start generating reciprocating flow, i.e. tidal field. By setting the parameters
of the inverter controller 15 to set the period of reciprocating flow and the maximum
flow speed (e.g., tidal reciprocating period of 2 hours, maximum flow speed of
.4m/s), the bidirectional inverter pump 14 starts to work and generates reciprocating
flow. Due to the presence of artificial initial terrain disturbance, it triggers the
instability of the seabed and changes the spatial structure of the tidal field, on the basis
of which the tidal sand waves are gradually formed.
4) Data acquisition is performed using flow velocity meters 16 and ultrasonic
topographer probes 21.
2 . Interaction of sand waves with submarine pipelines
1) Wait until the submarine sand wave is formed to a certain height, drain the
water in the tank 11, and then lay the submarine pipeline model 31 on top of the
formed submarine sand wave, and the laying angle can be changed as needed. Refill
the water to the original height and continue to simulate the tidal field.
2) Simultaneous observation of flow velocity, sand wave seabed, and submarine
pipeline motion and deformation using flow velocity meter 16, ultrasonic
topographer, high-speed camera 34, and fiber optic strain sensor 32.
Claims (8)
- THE CLAIMS DEFINING THE INVENTION ARE AS FOLLOWS:1 . An device for simulating the effect of submarine tidal sand waves on pipelineengineering, including an experimental water tank and tidal generation system (1), aterrain scanning system (2), a submarine pipeline simulation measurement system (3)and a data acquisition processing and controller (4), it is characterized in that: theexperimental water tank and tide generation system (1) includes a water tank (11), acirculation pipe (12), a gentle slope sand pit (13), a two-way variable frequency waterpump (14), a variable frequency controller (15) and a flow velocity meter (16); thegentle slope sand pit (13) is set in the middle of the water tank (11), and its two endsare raised and the middle is depressed to form a cavity for holding sea sand, while theraised part is connected to the bottom of the water tank through a gentle slope (17),and the height of the gentle slope (17) gradually decreases; the circulation pipe (12) isset on the lower side of the water tank (11), and its inlet and outlet ends are set on thebottom surfaces of two opposite ends of the water tank (11); the gently sloping sandpit (13) is filled with sea sand; the two-way variable frequency water pump (14) isinstalled on the circulation pipe (12), and the variable frequency controller (15) isconnected to the two-way variable frequency water pump (14) and data collection andprocessing and controller (4), controlling the two-way inverter water pump (14)according to the commands of the data collection processing and controller (4); theflow velocity meter (16) is mounted inside the water tank (11), which is connected tothe data collection processing and controller (4), to which the velocity of the waterflow in the water tank (11) is transmitted; the terrain scanning system (2) comprises an ultrasonic topographer, a connecting rod (22) and a motion device (23); the probe (21) of the ultrasonic topographer is mounted on the connecting rod (22), the connecting rod (22) is mounted on the motion device (23), the trajectory of which is controlled by the motion device (23); the connecting rod (22) is capable of changing the position of the ultrasonic topographer's probe (21) by means of telescoping; the ultrasonic topographer is connected to the data collection processing and controller (4) for echoing the sea sand topography in the gently sloping sand pit; the subsea pipeline simulation measurement system (3) includes a pipeline model (31), counterweight(33), fiber optic strain sensor (32) and high speed camera ( 34); the high-speed camera(34) is mounted above the water tank (11) and connected to the data acquisitionprocessing and controller (4) for photographing and transmitting back the morphologyof sea sand (13) in a gently sloping sand pit; the pipeline model (31) is placed in thegently sloping sand pit (13), which is partially or fully buried in sandy bed; thepipeline model (31) is provided with a counterweight (33) inside. the fiber optic strainsensor (32) is fixedly provided on the side wall of the pipe model (31) and isconnected to the data acquisition processing and controller (4) for transmitting backthe detected strain data of the pipe model (31).
- 2 . Device for simulating the effect of submarine tidal sand waves on pipelineworks as claimed in claim 1, characterized in that the movement device (23)comprises a track set on the wall of the water tank (11), a roller device capable ofmoving along the track, and an electric motor driving the movement of the rollerdevice.
- 3 . Device for simulating the effect of submarine tidal sand waves on pipelineengineering as claimed in claim 1, characterized in that the circulation pipe (12) isparallel to the long side of the gently sloping sand pit (13).
- 4 . Device for simulating the effect of submarine tidal sand waves on pipelineengineering as claimed in claim 1, characterized in that: the gentle slope (17) has across-section of a class of right-angled triangle with a ratio of height to bottom side of1:25 to 1:15.
- 5 . Device for simulating the effect of submarine tidal sand waves on pipelineengineering as claimed in claim 1, characterized in that: the sea sand in the gentlysloping sand pit (13) is locally a sand pile.
- 6 . Device for simulating the effect of submarine tidal sand waves on pipelineengineering as claimed in claim 1, characterized in that: preferably, there are fourstrings of the fiber optic strain sensors (32), which are attached on the wall of thepipeline model (31) along the axis and evenly distributed in the circumferentialdirection of each location with 90.
- 7 . Device for simulating the effect of submarine tidal sand waves on pipelineengineering as claimed in claim 1, characterized in that: the pipe model (31) is a PVCpipe and the counterweight (33) is water or sea sand.
- 8 . An experimental method for simulating the effect of submarine tidal sandwaves on a pipeline engineering, characterized in that it comprises the followingsteps:1) Loading sand samples into gently sloping sand pits (13), and after overallleveling of the sand surface, processing localized areas of the sand surface into tinybumps or grooves;2) Slowly injecting water into the water tank (11) under conditions that do notaffect the state of the sand sample in the gently sloping sand pit (13) to the depthrequired for the experiment;3) Controlling the two-way variable frequency water pump (14) to work to forma reciprocating flow in the tank (11) by using the frequency controller (15) to presetthe period and maximum flow rate of the reciprocating flow;4) Using flow velocity meters (16) and ultrasonic topographer probes (21) forcollecting the morphology within the gently sloping sand pit and transmitting thecollected data to the data acquisition processing and controller (4);5) When the sand sample forms a simulated submarine sand slope, empty thewater in the tank (11), lay the pipe model (31) on the submarine sand slope, refill thewater to the original height, and form a reciprocal flow in the tank to simulate the tidalfield;6) Using flow velocity meter (16), ultrasonic topographer, high-speed camera(34) and fiber optic strain sensor (32), the water flow velocity, the shape inside thegently sloping sand pit and the submarine pipeline movement and deformation areobserved simultaneously; and the collected data are transmitted to the data acquisitionprocessing and controller (4) for analysis and processing.FIGURES 1/2Figure 1
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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CN114459969A (en) * | 2022-01-19 | 2022-05-10 | 浙江省水利河口研究院(浙江省海洋规划设计研究院) | Layered silt collecting device for high-silt-content water body and using method |
CN114739333A (en) * | 2022-03-14 | 2022-07-12 | 中国长江三峡集团有限公司 | Real-time measuring and testing system and method for bed surface shape of load bed on water tank |
-
2021
- 2021-06-24 AU AU2021103583A patent/AU2021103583A4/en not_active Ceased
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN114459969A (en) * | 2022-01-19 | 2022-05-10 | 浙江省水利河口研究院(浙江省海洋规划设计研究院) | Layered silt collecting device for high-silt-content water body and using method |
CN114459969B (en) * | 2022-01-19 | 2024-03-12 | 浙江省水利河口研究院(浙江省海洋规划设计研究院) | Layered sediment collection device for high-sediment-content water body and use method |
CN114739333A (en) * | 2022-03-14 | 2022-07-12 | 中国长江三峡集团有限公司 | Real-time measuring and testing system and method for bed surface shape of load bed on water tank |
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