CN106153730B - Device and its measurement method in situ measurement seabed gassiness air in soil body content - Google Patents
Device and its measurement method in situ measurement seabed gassiness air in soil body content Download PDFInfo
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- CN106153730B CN106153730B CN201610455222.1A CN201610455222A CN106153730B CN 106153730 B CN106153730 B CN 106153730B CN 201610455222 A CN201610455222 A CN 201610455222A CN 106153730 B CN106153730 B CN 106153730B
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- gassiness
- soil
- upper plate
- dodge gate
- inner tube
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/07—Analysing solids by measuring propagation velocity or propagation time of acoustic waves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/01—Indexing codes associated with the measuring variable
- G01N2291/011—Velocity or travel time
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/024—Mixtures
- G01N2291/0245—Gases in porous solids
Abstract
The invention discloses a kind of devices and its measurement method in situ measurement seabed gassiness air in soil body content, which includes metal shell, metal inner tube, upper plate, dodge gate, hydraulic jack, displacement sensor, motor, microcontroller etc.；Metal shell side wall is provided with the mouth that buries；Dodge gate is equipped between metal shell and metal inner tube；The oil cylinder of hydraulic jack is fixed on the top of metal shell, and upper plate is fixedly mounted on the underpart of the piston rod of hydraulic jack；Motor is mounted on upper plate, and motor drives dodge gate；Displacement sensor is for measuring upper plate displacement.Invention solves the problems, such as that the uncertain big, error of the existing method for measuring gas content can not quantify；The present invention is that safe design ocean basic (such as offshore oil and gas platform base, offshore wind power foundation etc.) provides crucial parameter on the widely distributed gassiness soil sea beds in marine sites such as China Pearl River Delta, the Yangtze River Delta, Bohai Sea Gulf.
Description
Technical field
The invention belongs to the technical fields of seabed soil mechanical characteristic detection, are related to a kind of in situ measurement seabed gassiness
The device and its measurement method of air in soil body content.
Background technology
The petroleum resources in 70% or more the whole world are contained in seabed.The exploration of oil gas, the exploitation offshore drilling that places one's entire reliance upon are flat
Platform.Drilling platforms subjects the loads such as marine typhoon, billow.Pile foundation or anchoring positioning system of these loads by drilling platforms
System passes to sea bed.Therefore, the stability of drilling platforms depends on the mechanical characteristic (especially intensity, rigidity) of sea bed.China
The widely distributed weak sea bed rich in biogas in the marine sites such as Pearl River Delta, the Yangtze River Delta, Bohai Sea Gulf (containing a large amount of i.e. in seabed soil
Discrete bubble).Gas content is the key that determine gassiness soil strength and stiffness governing factor, and then directly determine marine brill
The safety of well platform and stability.
The measurement of air content has to be tested in situ in seabed.If gassiness soil is fetched into land from sea bed
Measurement in lab, soil in bubble volume will drastically expand with the rapid drawdown of soil body external pressure so that measurement result cannot be true
Real reflection air content in situ.Traditional gassiness means of testing in situ (speed experience propagated in the gassiness soil of seabed based on sound wave
Estimation air content) belong to indirect test method, this method has that uncertain strong, error can not quantify.Do not have also at present
Having can be directly in the seabed accurate instrument for measuring gassiness air in soil body tolerance in situ.
Invention content
In view of the deficiencies of the prior art, the present invention provides a kind of dress in situ measurement seabed gassiness air in soil body content
It sets and its measurement method.
The technical proposal for solving the technical problem of the invention is as follows：One kind being used in situ measurement seabed gassiness air in soil
The device of body content, including metal shell, metal inner tube, upper plate, displacement sensor, hydraulic jack, motor, activity
Door, hydraulic pump, microcontroller；The lower part of the metal shell be it is coniform, top be it is cylindric, the side wall of metal shell be provided with into
Tu Kou；The metal inner tube, upper plate, displacement sensor, hydraulic jack, motor, dodge gate are installed in metal shell
It is interior；Wherein, the metal inner tube is mounted at the mouth that buries of metal shell, for accommodating gassiness soil；The metal shell and gold
It is provided with dodge gate between category liner；The hydraulic pump is connected with hydraulic jack, and the oil cylinder of the hydraulic jack is fixed on
The top of metal shell, the upper plate are fixedly mounted on the piston rod of hydraulic jack, and upper plate is with hydraulic jack
Piston rod it is flexible, moved up and down along metal inner tube；The motor is mounted on upper plate, and motor passes through transmission device
Dodge gate is driven to move up and down；Institute's displacement sensors are mounted on the thin-walled stretched out outside metal inner tube, for measuring upper plate
Displacement；The hydraulic pump, motor, displacement sensor are connected with microcontroller.
Further, the bottom of the metal inner tube is equipped with ultrasonic wave transmitting terminal, and the upper plate is equipped with ultrasonic wave
Receiving terminal；The ultrasonic wave transmitting terminal and ultrasonic wave receiving terminal are positioned opposite；The ultrasonic wave transmitting terminal and ultrasonic wave receiving terminal
It is connected with microcontroller.
Further, the transmission device includes gear and rack；The gear is mounted on the output shaft of motor, institute
Rack is stated on dodge gate, the wheel and rack engaged transmission realizes moving up and down for dodge gate.
Further, it is sealed by a seal ring between the upper plate and metal inner tube；The upper plate and activity
It is sealed also by sealing ring between door.
A kind of measurement method of device in situ measurement seabed gassiness air in soil body content, this method are specially：
(1) invention device is inserted into gassiness soil sea bed：
Whole device is connected to the double freedom loading system on existing ocean workbench, and is added by double freedom
Entire invention device is inserted into gassiness soil sea bed by loading system vertically downward；
(2) acoustic speed in situ measurement seabed gassiness soil：
Dodge gate is opened, so that metal shell is moved horizontally by double freedom loading system, until being full of in metal inner tube
Gassiness soil, turns off dodge gate；Ultrasonic wave transmitting terminal emits compressional wave, ultrasonic wave receiving terminal into gassiness soil after dodge gate is closed
It receives soil body compressional wave, ultrasonic wave transmitting terminal and ultrasonic wave receiving terminal and beam signal is passed into microcontroller, microcontroller calculating can
Shortest time t of the wave beam used in the gassiness soil must be compressed；According to time t and ultrasonic wave transmitting terminal and ultrasonic wave receiving terminal it
Between distance h, you can the spread speed of compressional wave in gassiness soil is calculated by following formula：
The soil body compresses velocity of wave=propagation distance h/ propagation time t；
(3) in situ measurement seabed gassiness air in soil body content：
Hydraulic pump driving hydraulic jack slowly pushes the gassiness in upper plate compressed metal liner native, until gassiness soil nothing
Method is compressed again；The vertical decrement Δ h and metal inner tube elemental height h measured based on displacement sensor, the gassiness air in soil
The percent by volume of bubble can be calculated by following formula and be obtained：
Compared with the background art, the beneficial effects of the invention are as follows：Seabed gassiness air in soil body content is the rigid of decision sea bed
The key factor of degree and intensity is that safe design ocean is basic (being used to support offshore oil and gas platform, offshore wind farm unit etc.)
Important parameter.Present invention firstly provides a kind of in the seabed device in situ for directly measuring gassiness air in soil body content and its measurement side
Method.This solves traditional indirect test method (the speed empirical estimating air content propagated in the gassiness soil of seabed based on sound wave)
The problem of uncertain strong, error can not quantify.
Device disclosed by the invention is in addition to can directly measure gas content, can be with also simultaneous with sonic test module
Obtain the speed that sound wave is propagated in sea bed gassiness soil.Based on the air content and acoustic speed measured, can establish between the two
Relationship, evaluate and improve half theoretical semi-empirical relationship between existing " air content-velocity of wave ".
Description of the drawings
Fig. 1 is the structural diagram of the present invention；
Fig. 2 is the process schematic that the present invention measures seabed gassiness air in soil body content；
It is metal shell 1, metal inner tube 2, upper plate 3, sealing ring 4, displacement sensor 5, hydraulic jack 6, electronic in figure
Machine 7, ultrasonic wave receiving terminal 8, dodge gate 9, ultrasonic wave transmitting terminal 10.
Specific implementation mode
The present invention will be further described below with reference to the drawings.
As shown in Figure 1, the present invention include metal shell 1, metal inner tube 2, upper plate 3, sealing ring 4, displacement sensor 5,
Hydraulic jack 6, motor 7, ultrasonic wave receiving terminal 8, dodge gate 9, ultrasonic wave transmitting terminal 10, hydraulic pump, microcontroller；The sky
The lower part of heart metal shell 1 is coniform, and top is cylindric, and the side wall of metal shell 1 is provided with the mouth that buries；The metal inner tube
2, upper plate 3, displacement sensor 5, hydraulic jack 6, motor 7, dodge gate 9 are installed in metal shell 1；Wherein, institute
Metal inner tube 2 is stated at the mouth that buries of metal shell 1, for accommodating gassiness soil；The metal shell 1 and metal inner tube 2
Between be provided with dodge gate 9；The hydraulic pump is connected with hydraulic jack 6, and the oil cylinder of the hydraulic jack 6 passes through welding side
Formula is fixed on the top of metal shell 1, the upper plate 3 also by being welded and fixed on the piston rod of hydraulic jack 6,
Upper plate 3 with hydraulic jack 6 piston rod it is flexible, moved up and down along metal inner tube 2；The motor 7 is mounted on upper
On top plate 3, gear is installed on the output shaft of motor 7, rack is installed on the dodge gate 9, the wheel and rack is nibbled
Transmission is closed, realizes moving up and down for dodge gate 9；Institute's displacement sensors 5 are mounted on the thin-walled stretched out outside metal inner tube 2, are used
In the displacement for measuring upper plate 3；It is sealed by a seal ring between the upper plate 3 and metal inner tube 2；The upper plate 3
It is sealed also by sealing ring between dodge gate 9.
The metal shell 1 passes through double freedom (up and down, front and back) the load system on extension bar and ship or on offshore platform
System is connected, for controlling the upper and lower of entire feeler inspection device and moving horizontally.
Ultrasonic wave transmitting terminal 10, the centre installation of the upper plate 3 are installed at the bottom center of the metal inner tube 2
There are ultrasonic wave receiving terminal 8, ultrasonic wave transmitting terminal 10 and ultrasonic wave receiving terminal 8 positioned opposite.
The hydraulic pump, motor 7, displacement sensor 5, ultrasonic wave transmitting terminal 10 and ultrasonic wave receiving terminal 8 are and monolithic
Machine is connected, and to drive associated components (pushing of driving upper plate 3, the switch of dodge gate 9), (sound wave exists record related data
The content of biography wave velocity and gassiness air in soil body in gassiness soil).
The course of work of the present invention is as follows：
(1) invention device is inserted into gassiness soil sea bed
By whole device be connected to double freedom loading system on existing ocean workbench (control up and down, former and later two
The degree of freedom in direction), and entire invention device is inserted into vertically downward in gassiness soil sea bed by the loading system, such as Fig. 2
(a) shown in；
(2) acoustic speed in situ measurement seabed gassiness soil
Dodge gate 9 is opened, such as Fig. 2 (b).Make metal shell 1 by the double freedom loading system on the workbench of ocean
It moves horizontally, moves horizontally diameter of the distance of about 1.5 times of metal shell 1, it is native full of gassiness in metal inner tube 2 to ensure,
Such as Fig. 2 (c)；Dodge gate 9 is closed, as shown in Fig. 2 (d).
After dodge gate 9 is closed, ultrasonic wave transmitting terminal 10 emits compression wave beam into gassiness soil, and ultrasonic wave receiving terminal 8 receives
The soil body compresses wave beam (such as Fig. 2 (e)), and beam signal is passed to microcontroller by ultrasonic wave transmitting terminal 10 and ultrasonic wave receiving terminal 8, single
Piece machine can be calculated compression wave beam pass through gassiness soil used in shortest time t；According to time t and ultrasonic wave transmitting terminal 10 and surpass
The distance between sound wave receiving end 8 h (known), you can the spread speed of compressional wave in the gassiness soil is calculated by following formula：
The soil body compresses velocity of wave=propagation distance h/ propagation time t
(3) in situ measurement seabed gassiness air in soil body content
Microcontroller controls hydraulic pump, and driving hydraulic jack 6 slowly pushes the gassiness in 3 compressed metal liner 2 of upper plate
Soil, until gassiness soil can not be again by compression (i.e. the reading of displacement sensor 5 no longer changes), such as Fig. 2 (f) and Fig. 2 (g)；At this time
Think the bubble in gassiness soil be completely collapsed or the water that is dissolved under high pressure in the soil body in, and it is only surplus in metal inner tube 2
Lower soil particle and water (the general approximating assumption of the two is incompressible).
The 2 elemental height h of vertical decrement Δ h and metal inner tube measured based on displacement sensor 5, gassiness air in soil bubble
Percent by volume can pass through following formula calculate obtain：
Claims (4)
1. a kind of device in situ measurement seabed gassiness air in soil body content, which is characterized in that including metal shell (1),
Metal inner tube (2), upper plate (3), displacement sensor (5), hydraulic jack (6), motor (7), dodge gate (9), hydraulic pump,
Microcontroller；The lower part of the metal shell (1) is coniform, and top is cylindric, and the side wall of metal shell (1), which is provided with, to bury
Mouthful；The metal inner tube (2), upper plate (3), displacement sensor (5), hydraulic jack (6), motor (7), dodge gate (9)
It is installed in metal shell (1)；Wherein, the metal inner tube (2) is mounted at the mouth that buries of metal shell (1), for holding
Gassiness of receiving is native；It is provided with dodge gate (9) between the metal shell (1) and metal inner tube (2)；The hydraulic pump and hydraulic jack
It pushes up (6) to be connected, the oil cylinder of the hydraulic jack (6) is fixed on the top of metal shell (1), the fixed peace of the upper plate (3)
On the piston rod of hydraulic jack (6), upper plate (3) with hydraulic jack (6) piston rod it is flexible, along metal
Courage (2) moves up and down；The motor (7) is mounted on upper plate (3), and motor (7) drives dodge gate by transmission device
(9) it moves up and down；Institute's displacement sensors (5) are mounted on the thin-walled that metal inner tube (2) stretches out outside, for measuring upper plate
(3) displacement；The hydraulic pump, motor (7), displacement sensor (5) are connected with microcontroller；The metal inner tube (2)
Bottom is equipped with ultrasonic wave transmitting terminal (10), and the upper plate (3) is equipped with ultrasonic wave receiving terminal (8)；The ultrasonic wave transmitting
Hold (10) and ultrasonic wave receiving terminal (8) positioned opposite；The ultrasonic wave transmitting terminal (10) and ultrasonic wave receiving terminal (8) are and monolithic
Machine is connected.
2. the device according to claim 1 in situ measurement seabed gassiness air in soil body content, which is characterized in that institute
It includes gear and rack to state transmission device；The gear is mounted on the output shaft of motor (7), and the rack is mounted on activity
On door (9), the wheel and rack engaged transmission realizes moving up and down for dodge gate (9).
3. the device according to claim 1 in situ measurement seabed gassiness air in soil body content, which is characterized in that institute
It states and is sealed by sealing ring (4) between upper plate (3) and metal inner tube (2)；The upper plate (3) and dodge gate (9) it
Between be sealed also by sealing ring (4).
4. the measurement method of the device according to claim 1 in situ measurement seabed gassiness air in soil body content,
It is characterized in that, this method is specially：
(1) invention device is inserted into gassiness soil sea bed：
Whole device is connected to the double freedom loading system on existing ocean workbench, and is loaded by double freedom and is
Entire invention device is inserted into gassiness soil sea bed by system vertically downward；
(2) acoustic speed in situ measurement seabed gassiness soil：
Dodge gate (9) is opened, so that metal shell (1) is moved horizontally by double freedom loading system, until in metal inner tube (2)
Full of gassiness soil, dodge gate (9) is turned off；Ultrasonic wave transmitting terminal (10) emits compression into gassiness soil after dodge gate (9) is closed
Wave, ultrasonic wave receiving terminal (8) receive soil body compressional wave, ultrasonic wave transmitting terminal (10) and ultrasonic wave receiving terminal (8) by beam signal
Pass to microcontroller, microcontroller can be calculated compression wave beam and pass through shortest time t used in gassiness soil；According to time t and surpass
The distance between sound wave transmitting terminal (10) and ultrasonic wave receiving terminal (8) h, you can compressional wave in gassiness soil is calculated by following formula
Spread speed：
The soil body compresses velocity of wave=distance h/ propagation time t；
(3) in situ measurement seabed gassiness air in soil body content：
Hydraulic pump drives hydraulic jack (6) slowly to push the gassiness soil in upper plate (3) compressed metal liner (2), Zhi Daohan
Gas soil can not be compressed again；The vertical decrement Δ h and metal inner tube (2) elemental height measured based on displacement sensor (5), should
The percent by volume of gassiness air in soil bubble can be calculated by following formula and be obtained：
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| CN106153730B true CN106153730B (en) | 2018-11-13 |
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| CN201034719Y (en) * | 2007-04-20 | 2008-03-12 | 国家海洋局第二海洋研究所 | Multiple frequency seabed acoustics in-situ test platform |
| CN103424414A (en) * | 2012-05-22 | 2013-12-04 | 青岛海洋地质研究所 | CT in-situ detection device for microcosmic occurrence of hydrates in deposits |
| KR20160041372A (en) * | 2014-10-07 | 2016-04-18 | 포항공과대학교 산학협력단 | Method for the evaluation of on-bottom stability of subsea pipeline by dynamic embedment |
| CN105606702A (en) * | 2015-11-12 | 2016-05-25 | 中国科学院广州能源研究所 | Sediment acoustic propagation characteristic testing device |
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2016
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| CN201034719Y (en) * | 2007-04-20 | 2008-03-12 | 国家海洋局第二海洋研究所 | Multiple frequency seabed acoustics in-situ test platform |
| CN103424414A (en) * | 2012-05-22 | 2013-12-04 | 青岛海洋地质研究所 | CT in-situ detection device for microcosmic occurrence of hydrates in deposits |
| KR20160041372A (en) * | 2014-10-07 | 2016-04-18 | 포항공과대학교 산학협력단 | Method for the evaluation of on-bottom stability of subsea pipeline by dynamic embedment |
| CN105606702A (en) * | 2015-11-12 | 2016-05-25 | 中国科学院广州能源研究所 | Sediment acoustic propagation characteristic testing device |
Non-Patent Citations (2)
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