CN100565169C - Detect the analogy method and the analogue means thereof of lateral stability of directly laid pipes on sea floor - Google Patents

Detect the analogy method and the analogue means thereof of lateral stability of directly laid pipes on sea floor Download PDF

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Publication number
CN100565169C
CN100565169C CNB2008100566432A CN200810056643A CN100565169C CN 100565169 C CN100565169 C CN 100565169C CN B2008100566432 A CNB2008100566432 A CN B2008100566432A CN 200810056643 A CN200810056643 A CN 200810056643A CN 100565169 C CN100565169 C CN 100565169C
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China
Prior art keywords
pipeline
soil
sea floor
analogue
directly laid
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CNB2008100566432A
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Chinese (zh)
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CN101221097A (en
Inventor
高福平
闫术明
吴应湘
赵波
雒承才
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中国科学院力学研究所
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Abstract

The invention discloses a kind of analogy method and analogue means thereof that detects lateral stability of directly laid pipes on sea floor, at first prepare soil sample, the simulation sea bed; Installation test pipeline: when pipeline has just contacted with sea bed, discharge pipeline and make it under the self gravitation effect, produce initial settlement, adopt the initial settlement amount of laser displacement sensor measuring channel in the soil body simultaneously.By stepper motor pipeline is applied oblique pulling force, simulate of horizontal drag and the vertical lift effect of unidirectional ocean current pipeline; The horizontal shift of the pulling force, pipe side of measuring stepper motor simultaneously in the unstability process and the displacement field and the soil lateral pressure of subsequent settlement, pipe side below soil body in the unstability process.Utilize analogy method of the present invention and analogue means thereof can effectively simulate the pressure-bearing soil body of directly laid pipes on sea floor, unidirectional ocean current to the horizontal drag of pipeline and vertical lift etc., and measuring channel ground limit side direction soil resistance equistability parameter in real time, thereby but the lateral stability of sunykatuib analysis directly laid pipes on sea floor.

Description

Detect the analogy method and the analogue means thereof of lateral stability of directly laid pipes on sea floor

Technical field

The present invention relates to offshore engineering, marine soil mechanics, submarine pipeline engineering field, especially a kind of analogy method and analogue means thereof that detects lateral stability of directly laid pipes on sea floor.

Background technology

Submarine pipeline is an effective tool of carrying oil gas in the marine petroleum development process.Under current load, submarine pipeline will be subjected to the hydrodynamism of horizontal drag and vertical lift; Simultaneously, pipeline also is subjected to self gravitation, the vertical holding power that its below soil body provides and the combined action of lateral resistance.When lateral resistance that the soil body provides is not enough to drag that the balance ocean current causes, pipeline will produce horizontal shift, and loss of stability, when the horizontal displacement of each section of pipeline generation is inequality, pipeline can cause the pipe-line fracture accident with stressed bending when serious.As seen, under marine environment load, can the lateral stability that be laid immediately on the submarine pipeline on the sea bed be directly connected to piping system and normally run.Thereby, under certain pipeline initial settlement amount, the maximum horizontal soil resistance that the effective measuring channel of energy can bear, and then the stability condition of definite pipeline becomes the key issue in the submarine pipeline engineering.

Summary of the invention

Problem at the prior art existence, too Fa Ming primary and foremost purpose provides a kind of analogy method that detects lateral stability of directly laid pipes on sea floor, utilize this method can effectively simulate the environment that directly laid pipes on sea floor is laid, thereby effectively detect lateral stability of directly laid pipes on sea floor.Further purpose of the present invention provides a kind of analogue means of implementing said method.

For achieving the above object, the present invention detects the analogy method of lateral stability of directly laid pipes on sea floor, is specially:

1) preparation soil sample, the simulation sea bed;

2) installation test pipeline: when pipeline has just contacted with sea bed, discharge pipeline and make it under the self gravitation effect, produce initial settlement, adopt the initial settlement amount of laser displacement sensor measuring channel in the soil body simultaneously.

3) by stepper motor described pipeline is applied oblique pulling force, simulate of horizontal drag and the vertical lift effect of unidirectional ocean current pipeline; Measure pulling force, the horizontal shift of pipe side in the unstability process and the displacement field of subsequent settlement and pipe side below soil body in the unstability process of described stepper motor simultaneously, can analyze the lateral stability of directly laid pipes on sea floor situation by measured data.

A kind of analogue means of implementing the detection lateral stability of directly laid pipes on sea floor of said method, this analogue means comprises soil box and preparation of soil sample system, mechanical load system, parameter measurement system, preparation of soil sample system is used for preparation seabed soil sample in described soil box, so that the pressure-bearing soil body of simulation pipeline; The mechanical load system is used to simulate horizontal drag and the vertical lift effect of unidirectional ocean current to pipeline; Parameter measurement system is used for the DATA REASONING to experiment.

Further, described soil box adopts transparent tempered glass to make, so that observe the dynamic process of pipeline side direction unstability in measuring; Described preparation of soil sample system adopts sand rain legal system to be equipped with the sand soil sample.

Further, described mechanical load system comprises stepper motor, automatic fine tuning device, stay cord, model pipeline, automatic fine tuning device is provided with fixed pulley, stay cord one end is fixedly connected on the transmission shaft of stepper motor, the stay cord other end is fixedlyed connected with model pipeline after walking around described fixed pulley, described automatic fine tuning device can be adjusted described fixed pulley in the vertical direction motion, thereby guarantees to make that in pipe side the angle of described stay cord and soil body surface level is constant in the unstability process.

Further, the angular range of described stay cord and soil body surface level is between 40 °~60 °.

Further, described model pipeline is provided with central shaft and pipe ends freedom, and described stay cord is fixedly connected on the described central shaft, moves with parallel thereby make pipeline to rotate simultaneously.

Further, be set with the two parallel-crank mechanisms that prevent that pipeline from rotating on the described model pipeline, described stay cord is with after model pipeline is fixedlyed connected, and it is parallel mobile to make model pipeline to take place.

Further, described parameter measurement system comprises laser displacement sensor, pulling force sensor, laser particle image speed measurement instrument and soil pressure sensor, and pulling force sensor is arranged on the described stay cord, is used to measure the value of thrust that described stepper motor applies; Laser displacement sensor is used for measuring the initial settlement amount of described model pipeline at the soil body; Laser particle image speed measurement instrument is used for measuring the displacement field of the described model pipeline side direction unstability process below soil body; Soil pressure sensor is arranged under the described model pipeline on the outward flange, and is used to measure the soil pressure that described model pipeline is born.

Utilize the present invention to detect the analogy method and the analogue means thereof of lateral stability of directly laid pipes on sea floor, can effectively simulate the pressure-bearing soil body of directly laid pipes on sea floor, unidirectional ocean current to the horizontal drag of pipeline and vertical lift etc., and measurement stability parameter in real time, thereby but the lateral stability of sunykatuib analysis directly laid pipes on sea floor.

Description of drawings

Fig. 1 is the structural representation of the embodiment of the invention 1;

Fig. 2 is the structural representation of the embodiment of the invention 2.

Embodiment

Embodiment 1

As shown in Figure 1, the analogue means that the present invention detects lateral stability of directly laid pipes on sea floor comprises soil box and preparation of soil sample system 1, mechanical load system 2, parameter measurement system 3, wherein soil box and preparation of soil sample system 1 comprise soil box 11, the soil body 12, soil box 11 adopts transparent tempered glass to make, so that observe the state of pipeline in measuring; The soil body 12 is made for the sand soil sample that adopts the preparation of sand rain method, thereby has better simulated the sand sea bed; Mechanical load system 2 comprises stepper motor 21, automatic fine tuning device 25, stay cord 22, model pipeline 23, and simulation pipeline 23 is the two ends freedom in the present embodiment, and pipeline center is provided with central shaft 24, and this pipeline not only translation takes place but also roll when unstability; Automatic fine tuning device 25 is provided with fixed pulley 251, stay cord 22 1 ends are fixedly connected on the transmission shaft of stepper motor 21, stay cord 22 other ends are fixedlyed connected with central shaft 24 via fixed pulley 251 backs, thereby making pipeline to rotate simultaneously moves with parallel, the automatic fine tuning device 25 adjustable pulley 251 in the vertical directions motions of adjusting, thereby guarantee that stay cord 22 is constant with the angle of soil body surface level, make like this and work as pulling force one timing that stepper motor is exported, the level that acts on the model pipeline 23 by stay cord 22 pulls power and the certain ratio of vertical tension maintenance, thereby better reflects the characteristics of the suffered hydrodynamic load of pipeline under the unidirectional action of ocean current.Parameter measurement system 3 comprises laser displacement sensor 32 and 34, pulling force sensor 31, laser particle image speed measurement instrument 33 and soil pressure sensor 35, pulling force sensor 31 is arranged on the stay cord 22, be used to measure the value of thrust that stepper motor 21 applies, laser displacement sensor 34 is used for the initial settlement amount of measurement model pipeline 23 at the soil body 12, laser displacement sensor 32 is used for the horizontal displacement of measurement model pipeline 23 in the unstability process, laser particle image speed measurement instrument 33 is used for the displacement field of the measurement model pipeline 23 side direction unstability processes below soil body, soil pressure sensor 35 is arranged on 23 times outward flanges of model pipeline, and is used for the soil pressure that measurement model pipeline 23 is born.

During work, at first prepare the seabed soil sample, in soil box 11, fill the soil body 12 and simulate sea bed; Model pipeline 23 is installed: when pipeline has just contacted with sea bed, discharge model pipeline 23 and make it under the self gravitation effect, produce initial settlement, adopt the initial settlement amount of laser displacement sensor 34 measurement model pipelines 23 in the soil body simultaneously; Apply oblique pulling force by 21 pairs of model pipeline 23 of stepper motor, simulate of horizontal drag and the vertical lift effect of unidirectional ocean current pipeline; Measure the pulling force of stepper motor 21, the displacement field that passes through horizontal shift and the subsequent settlement in laser displacement sensor 32, the 34 measurement model pipelines 23 side direction unstability processes and pass through the below soil body in the laser particle image speed measurement instrument 33 measuring channel side direction unstability processes by pulling force sensor 31 simultaneously, wherein for horizontal shift and subsequent settlement in the model pipeline 23 side direction unstability processes, also can come record, can show the state of pipeline in the unstability process more intuitively like this by digital camera system is set.Can analyze the directly laid pipes on sea floor example to steadiness by all measured data.

Embodiment 2

Simulation pipeline 23 is provided with the anti-rolling device of two parallel-crank mechanisms 26 in the present embodiment, and under the constraint of two parallel-crank mechanisms 26, simulation pipeline 23 can only be moved.Identical among other analogue means and method and the embodiment 1 in the present embodiment.

Detect the analogy method and the analogue means thereof of lateral stability of directly laid pipes on sea floor for the present invention, simulate the hydrodynamic force of ocean current by the pulling force that stepper motor 21, stay cord 22 apply, can change value of thrust by outputting torsion that changes motor or the angle that changes stay cord 22 and soil body surface level, the angle change scope of stay cord 22 and soil body surface level is between 40~60 ° usually.Simulation pipeline 23 weight (unit length) realize by the increase and decrease counterweight, can change its surfaceness by pasting various objectives sand paper at pipe surface.

Claims (8)

1, detect the analogy method of lateral stability of directly laid pipes on sea floor, be specially:
1) preparation soil sample, the simulation sea bed;
2) model pipeline is installed: when pipeline has just contacted with sea bed, discharge pipeline and make it under the self gravitation effect, produce initial settlement, adopt the initial settlement amount of laser displacement sensor measuring channel in the soil body simultaneously.
3) by stepper motor described pipeline is applied oblique pulling force, simulate of horizontal drag and the vertical lift effect of unidirectional ocean current pipeline; Measure pulling force, the horizontal shift of pipe side in the unstability process and the displacement field of subsequent settlement and pipe side below soil body in the unstability process of described stepper motor simultaneously, can analyze the lateral stability of directly laid pipes on sea floor situation by measured data.
2, a kind of analogue means of implementing the detection lateral stability of directly laid pipes on sea floor of the described method of claim 1, it is characterized in that, this analogue means comprises soil box and preparation of soil sample system, mechanical load system, parameter measurement system, preparation of soil sample system is used for preparation seabed soil sample in described soil box, so that the pressure-bearing soil body of simulation pipeline; The mechanical load system is used to simulate horizontal drag and the vertical lift effect of unidirectional ocean current to pipeline; Parameter measurement system is used for the data of experiment are measured.
3, the analogue means of detection lateral stability of directly laid pipes on sea floor as claimed in claim 2 is characterized in that, described soil box adopts transparent tempered glass to make, so that observe the dynamic process of pipeline side direction unstability in measuring; Described preparation of soil sample system adopts sand rain legal system to be equipped with the sand soil sample.
4, the analogue means of detection lateral stability of directly laid pipes on sea floor as claimed in claim 2, it is characterized in that, described mechanical load system comprises stepper motor, automatic fine tuning device, stay cord, model pipeline, automatic fine tuning device is provided with fixed pulley, stay cord one end is fixedly connected on the transmission shaft of stepper motor, the stay cord other end is fixedlyed connected with model pipeline after walking around described fixed pulley, described automatic fine tuning device can be adjusted described fixed pulley in the vertical direction motion, thereby guarantees to make that in pipe side the angle of described stay cord and soil body surface level is constant in the unstability process.
5, the analogue means of detection lateral stability of directly laid pipes on sea floor as claimed in claim 4 is characterized in that, the angular range of described stay cord and soil body surface level is between 40 °~60 °.
6, the analogue means of detection lateral stability of directly laid pipes on sea floor as claimed in claim 4, it is characterized in that, described model pipeline is provided with central shaft and pipe ends freedom, described stay cord is fixedly connected on the described central shaft, moves with parallel thereby make pipeline to rotate simultaneously.
7, the analogue means of detection lateral stability of directly laid pipes on sea floor as claimed in claim 4, it is characterized in that, also can be set with the two parallel-crank mechanisms that prevent that pipeline from rotating on the described model pipeline, when described stay cord with after model pipeline is fixedlyed connected, make model pipeline that parallel moving can only be taken place.
8, the analogue means of detection lateral stability of directly laid pipes on sea floor as claimed in claim 4, it is characterized in that, described parameter measurement system comprises laser displacement sensor, pulling force sensor, laser particle image speed measurement instrument and soil pressure sensor, pulling force sensor is arranged on the described stay cord, is used to measure the value of thrust that described stepper motor applies; Laser displacement sensor is used for measuring the initial settlement amount of described model pipeline at the soil body; Laser particle image speed measurement instrument is used for measuring the displacement field of the described model pipeline side direction unstability process below soil body; Soil pressure sensor is arranged under the described model pipeline on the outward flange, and is used to measure the soil pressure that described model pipeline is born.
CNB2008100566432A 2008-01-23 2008-01-23 Detect the analogy method and the analogue means thereof of lateral stability of directly laid pipes on sea floor CN100565169C (en)

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