CN1333252C - Simulating method and device for submarine pipeline foundation suspension induced by permeation deformation - Google Patents
Simulating method and device for submarine pipeline foundation suspension induced by permeation deformation Download PDFInfo
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- CN1333252C CN1333252C CNB2005101029953A CN200510102995A CN1333252C CN 1333252 C CN1333252 C CN 1333252C CN B2005101029953 A CNB2005101029953 A CN B2005101029953A CN 200510102995 A CN200510102995 A CN 200510102995A CN 1333252 C CN1333252 C CN 1333252C
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Abstract
The present invention discloses a simulation method and a device for the induction of seepage deformation and the suspension of submarine pipeline foundations. The method comprises the procedures: 1. a soil sample is prepared in experimental water tanks, and a simulation sea bed is obtained; 2. an experimental pipeline is installed in the simulation sea bed and is embedded in the set depth of the sea bed; 3. the water tanks on both sides of the experimental pipeline are mutually separated, different kinds of pressure are respectively exerted on the water tanks on both of the two sides of the experimental pipeline, and a preset pressure difference is generated between the water tanks on both of the two sides of the experimental pipeline; 4. the deformation of the soil sample below the experimental pipeline is observed. Therefore, different kinds of pressure are exerted on the experimental water tanks on both sides of a partition board successively, and the functions of ocean currents can be simulated on both of the two sides of the experimental pipeline. Moreover, the method has the advantages of simple device and easy operation. Users only need to exert different kinds of pressure in the experimental water tanks on both of the two sides of the partition board successively by using the device of the present invention, and the functions of ocean currents can be simulated on both of the two sides of the experimental pipeline.
Description
Technical field
The present invention relates to a kind of analogy method and device of submarine pipeline engineering.
Background technology
Can submarine pipeline be the most effective instrument of carrying oil gas in the marine petroleum development process, be laid on the stability of pipeline under marine environment on the sea bed and be directly connected to piping system and normally run.Under specific action of ocean current, it is poor that the pipeline both sides can form constant compression force: the place ahead of pipeline is the higher-pressure region in face of the direction of incoming flow promptly, form low-pressure area at the pipeline rear, and under wave action, the pressure differential of pipeline both sides is to change in the cycle.The pressure at both sides of pipeline is poor, will make pipeline below inside soil body form seepage flow, and under certain pressure differential situation, the soil body of pipeline below will produce seepage deformation, and then it is empty to induce submarine pipeline foundation to be washed in a pan; After the local ground of pipeline is washed in a pan sky, pipeline will produce suspended span, and at this moment vortex-induced vibration may take place pipeline under the effect of fluid-load, can cause pipeline break when serious.
In order to analyze the process of submarine pipeline foundation suspension induced by permeation deformation, need this process is simulated.
Summary of the invention
The object of the present invention is to provide a kind of analogy method and device of submarine pipeline foundation suspension induced by permeation deformation, for achieving the above object, solution of the present invention is:
A kind of analogy method of submarine pipeline foundation suspension induced by permeation deformation, this method may further comprise the steps:
(1) in experimental trough, prepares the soil body, obtain simulating sea bed;
(2) in this simulation sea bed, experimental channel is installed, and is made experimental channel embed the sea bed set depth;
(3) tank of experimental channel both sides is separated mutually, and in the tank of experimental channel both sides, applied different pressure respectively, make between the tank of experimental channel both sides and produce predetermined pressure difference;
(4) specimen deformation of observation experiment pipeline below.
Further, in described step (two), described experimental channel two ends are resisted against respectively on the two side of described experimental trough, and be sealedly connected with the dividing plate that is complementary with this experimental channel length on the described experimental channel, this dividing plate can with respect to described experimental trough move up and down and and the experimental trough wall between seal.
Further, in described step (three), in the tank of described experimental channel both sides, apply different pressures successively, make the cycle dynamic pressure that has certain amplitude between the tank of pipeline both sides.
Further, in described step (three) that described experimental trough is airtight, in the airtight water of experimental channel one side is poor, be pressurized to predetermined value by pressure gas, opposite side maintenance normal pressure makes between the tank of pipeline both sides to exist pressure stable poor.
Further, in described step (three), at first inject the identical suitable quantity of water of the degree of depth respectively in the both sides of described experimental trough internal partition, then with the gap Close All of a side, and open the water inlet pipe of this side, stationary flow is flowed into,, make between the tank of pipeline both sides to exist pressure stable poor simultaneously with a unlatching in the gap of opposite side.
Further, in described step (three), described experimental trough is airtight, in the airtight tank of described experimental channel both sides, be pressurized to predetermined value successively by pressure gas, opposite side keeps normal pressure, makes the cycle dynamic pressure that has certain amplitude between the tank of pipeline both sides.
A kind of device of realizing said method, this device comprises experimental trough, be provided with the soil body in the experimental trough, the soil body is provided with experimental channel, this experimental channel embeds soil body certain depth, and have dividing plate on this experimental channel, the two ends of this experimental channel and dividing plate all are resisted against on the two side of this experimental trough, this dividing plate can with respect to tank move up and down and and the experimental trough wall between seal.
Further, differing heights on the experimental trough wall of described dividing plate both sides, be respectively equipped with the gap that several can be opened, close, and described experimental trough internal partition both sides are respectively equipped with water inlet pipe, water inlet pipe is provided with water volume control device, in the water of described experimental channel both sides pressure transducer is installed, this pressure transducer is connected with this water volume control device.
Further, described dividing plate two ends are equipped with draw-in groove, and the relevant position on the described experimental trough is provided with and the corresponding boss of this draw-in groove.
Further, be provided with the draw-in groove that can fix mutually with described dividing plate with the corresponding position of described dividing plate on the described experimental trough sidewall, be respectively equipped with miniature pore water pressure sensor in described experimental channel both sides, this miniature pore water pressure sensor is embedded near the soil body of described experimental channel.
After adopting said method, because apparatus of the present invention comprise experimental trough, be provided with the soil body in the experimental trough, the soil body is provided with experimental channel, this experimental channel embeds on soil body certain depth and this experimental channel and has dividing plate, the equal overhead in the two ends of this experimental channel and dividing plate is on the two side of this experimental trough, experimental trough is divided into separate two parts, therefore in the experimental trough of dividing plate both sides, apply different pressures successively, can be at experimental channel both sides simulations action of ocean current, this method and install simple, easy to operate.In addition, because the differing heights that is respectively equipped with on water inlet pipe and the experimental trough wall in the dividing plate both sides is respectively equipped with several gaps, therefore can produces pressure reduction because of water surface elevation is different and simulate action of ocean current in the dividing plate both sides; In the water of experimental channel both sides pressure transducer is installed, this pressure transducer is connected with water volume control device on being located at water inlet pipe, makes the pressure reduction of the experimental channel both sides that obtain more accurate.
Description of drawings
Fig. 1 is the front elevation of apparatus of the present invention;
Fig. 2 is the vertical view of apparatus of the present invention;
Fig. 3 is the vertical view of another embodiment of apparatus of the present invention.
Embodiment:
As shown in Figure 1, the preparation soil body 2 in experimental trough 1, form the simulation sea bed, experimental channel 3 is installed then, make experimental channel 3 embed the soil body 2 certain depths, have dividing plate 4 on the experimental channel 3, the two ends of experimental channel 3 and dividing plate 4 are resisted against on the two side of experimental trough 1 respectively, and as shown in Figure 2, dividing plate 4 two ends are provided with draw-in groove 41 and fix mutually with the boss 11 that experimental trough 1 sidewall is provided with, be provided with sealing gasket between this draw-in groove and the boss, dividing plate 4 can move up and down with respect to tank 1; Or draw-in groove 12 being set at tank 1 sidewall, dividing plate 4 directly is fastened in the draw-in groove 12, between dividing plate 4 and draw-in groove 12 sealing gasket is set, as shown in Figure 3; Experimental channel 3 and dividing plate 4 are divided into 13,14 two parts with tank 1, and these two parts are respectively equipped with water inlet pipe 5,6, and the differing heights on the experimental trough wall of dividing plate 4 both sides, are respectively equipped with several gaps 42,43;
At first in the identical suitable quantity of water of the both sides of tank 1 internal partition 4 difference injecting height, then with gap 42 Close Alls, with a unlatching in the gap 43, open water inlet pipe 5, make stationary flow flow into 13 parts of tank, 13 in the tank then, produce pressure reduction between 14 two parts, under differential pressure action, form seepage flow in the soil body 2 below pipeline 3 from tank 13 to 14, when arriving the gap 43 of opening, the water surface of tank 14 parts then overflows from this gap, make tank 14 internal water pressures keep constant, thereby keep 13 of tank, pressure reduction is stable between 14 two parts, unlatching is arranged at the gap on the different level, and it is poor to obtain different uniaxial pressures in pipeline 3 both sides; Under this unidirectional differential pressure action, can simulate the effect of unidirectional ocean current, the soil body of pipeline below will produce seepage deformation, and then it is empty that the soil body is washed in a pan, method by noncontact optical measurement, the transparent limit wall that sees through tank is measured the soil body seepage flow distortion that seepage flow causes, also can detect the triggering of foundation suspension etc.
Perhaps, in experimentation, at first in the identical suitable quantity of water of the both sides of tank 1 internal partition 4 difference injecting height, then that described experimental trough 1 is airtight, mode by air lift pump or other pressure gas in the airtight tank 13 of experimental channel 3 one sides is pressurized to predetermined value to closed gas, and tank opposite side 14 keeps normal pressure, make the tank 13 of pipeline both sides, exist stable uniaxial pressure poor between 14, under this unidirectional differential pressure action, can simulate the effect of unidirectional ocean current, the soil body 2 of pipeline 3 belows will produce seepage deformation, and then it is empty that the soil body is washed in a pan, by the method for noncontact optical measurement, the transparent limit wall that sees through tank 1 is measured the soil body seepage flow distortion that seepage flow causes, also can detect the triggering of foundation suspension etc.
Mode by air lift pump or other pressure gas in the airtight tank 13 of experimental channel 3 one sides is pressurized to predetermined value to closed gas, and opposite side 14 keeps normal pressure, make the tank 13 of experimental channel both sides, exist stable uniaxial pressure poor between 14, keep this state after a period of time, be pressurized to predetermined value for the closed gas in the airtight tank 14, and maintenance normal pressure in the opposite side 13, make the tank 13 of experimental channel both sides, exist rightabout stable uniaxial pressure poor between 14, so circulation, the cycle dynamic pressure that then between the tank of experimental channel 3 both sides, has certain amplitude, the transparent limit wall that sees through tank is measured the soil body seepage flow distortion that seepage flow causes, also can detect the triggering of foundation suspension etc.
For the pressure differential that makes experimental channel 3 both sides that obtain more accurate, setting pressure sensor 7 in the water of experimental channel 3 both sides, this pressure transducer 7 is connected with water volume control device 8 on being located at water inlet pipe 5,6, with accurate control inflow.In addition, for making experimental water reusable edible in the experimentation, gap 42,43 is connected with water tank 9,10 respectively, be provided with water pump 20,30 in the water tank 9,10, this two water pump is connected with water inlet pipe 5,6 respectively, when the tank domestic demand is intake, open water pump 20 or 30 and get final product, make the experimental water reusable edible.
In addition, be respectively equipped with miniature pore water pressure sensor in experimental channel 3 both sides, this miniature pore water pressure sensor is embedded near the experimental channel 3 the soil body, is used to measure the soil body pore water pressure of experimental channel 3 both sides under the different pressure reduction, to detect the water permeability of the soil body.
Claims (9)
1, a kind of analogy method of submarine pipeline foundation suspension induced by permeation deformation is characterized in that: should
Method may further comprise the steps:
(1) in experimental trough, prepares the soil body, obtain simulating sea bed;
(2) in this simulation sea bed, experimental channel is installed, is had the dividing plate that is complementary with described experimental channel length on this experimental channel, and make experimental channel embed the sea bed set depth;
(3) these experimental channel two ends all are resisted against on the two side of this experimental trough, this dividing plate can with respect to experimental trough move up and down and and the experimental trough wall between seal, thereby the tank of experimental channel both sides is separated mutually, and in the tank of experimental channel both sides, apply different pressure respectively, make between the tank of experimental channel both sides and produce predetermined pressure difference;
(4) specimen deformation of observation experiment pipeline below.
2, the analogy method of submarine pipeline foundation suspension induced by permeation deformation as claimed in claim 1, it is characterized in that: in described step (three), in the tank of described experimental channel both sides, apply different pressures successively, make the cycle dynamic pressure that has certain amplitude between the tank of pipeline both sides.
3, the analogy method of submarine pipeline foundation suspension induced by permeation deformation as claimed in claim 1, it is characterized in that: in described step (three), described experimental trough is airtight, in the airtight tank of experimental channel one side, be pressurized to predetermined value by pressure gas, opposite side keeps normal pressure, makes between the tank of pipeline both sides to exist pressure stable poor.
4, the analogy method of submarine pipeline foundation suspension induced by permeation deformation as claimed in claim 1, it is characterized in that: in described step (three), at first inject the identical suitable quantity of water of the degree of depth respectively in the both sides of described experimental trough internal partition, then with the gap Close All of a side, and open the water inlet pipe of this side, stationary flow is flowed into,, make between the tank of pipeline both sides to exist pressure stable poor simultaneously with a unlatching in the gap of opposite side.
5, the analogy method of submarine pipeline foundation suspension induced by permeation deformation as claimed in claim 2, it is characterized in that: in described step (three), described experimental trough is airtight, in the airtight tank of described experimental channel both sides, be pressurized to predetermined value successively by pressure gas, opposite side keeps normal pressure, makes the cycle dynamic pressure that has certain amplitude between the tank of pipeline both sides.
6, a kind of device of realizing the method for aforesaid right requirement 1, it is characterized in that: this device comprises experimental trough, be provided with the soil body in the experimental trough, the soil body is provided with experimental channel, this experimental channel embeds soil body certain depth, and have dividing plate on this experimental channel, the two ends of this experimental channel and dividing plate all are resisted against on the two side of this experimental trough, this dividing plate can with respect to tank move up and down and and the experimental trough wall between seal.
7, device as claimed in claim 6, it is characterized in that: the differing heights on the experimental trough wall of described dividing plate both sides, be respectively equipped with the gap that several can be opened, close, and described experimental trough internal partition both sides are respectively equipped with water inlet pipe, water inlet pipe is provided with water volume control device, in the water of described experimental channel both sides pressure transducer is installed, this pressure transducer is connected with this water volume control device.
8, device as claimed in claim 6 is characterized in that: described dividing plate two ends are equipped with draw-in groove, and the relevant position on the described experimental trough is provided with and the corresponding boss of this draw-in groove.
9, device as claimed in claim 6 is characterized in that: be provided with the draw-in groove that can fix mutually with described dividing plate with the corresponding position of described dividing plate on the described experimental trough sidewall,
Be respectively equipped with miniature pore water pressure sensor in described experimental channel both sides, this miniature pore water pressure sensor is embedded near the soil body of described experimental channel.
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| CNB2005101029953A CN1333252C (en) | 2005-09-16 | 2005-09-16 | Simulating method and device for submarine pipeline foundation suspension induced by permeation deformation |
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| CNB2005101029953A CN1333252C (en) | 2005-09-16 | 2005-09-16 | Simulating method and device for submarine pipeline foundation suspension induced by permeation deformation |
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| CN1333252C true CN1333252C (en) | 2007-08-22 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100565169C (en) * | 2008-01-23 | 2009-12-02 | 中国科学院力学研究所 | Detect the analogy method and the analogue means thereof of lateral stability of directly laid pipes on sea floor |
| CN102147321A (en) * | 2011-01-12 | 2011-08-10 | 中国海洋石油总公司 | Uniform flow vortex-induced vibration simulation tester for seabed pipeline |
| CN102242830B (en) * | 2011-07-20 | 2012-11-14 | 中国人民解放军后勤工程学院 | Method for stabilizing submarine oil pipeline |
| CN105841744A (en) * | 2016-05-11 | 2016-08-10 | 吴庆伟 | Similar material simulation experiment apparatus and test method for pipeline crossing river |
| CN109799067A (en) * | 2019-03-25 | 2019-05-24 | 浙江省水利河口研究院 | Submarine pipeline washes away hanging critical pressure differential experimental provision and application method on muddy sea bed |
| CN114018539B (en) * | 2021-09-15 | 2023-08-29 | 山东大学 | Submarine oil and gas pipeline stability model test device and test method |
| CN115165242B (en) * | 2022-06-14 | 2023-07-25 | 浙江大学 | Centrifugal test device and method for simulating buried pipeline reciprocating leakage induced subsidence |
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