CN109269903A - Various boundary conditions Lower chains and the tangential drag test device of soil and method - Google Patents
Various boundary conditions Lower chains and the tangential drag test device of soil and method Download PDFInfo
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- CN109269903A CN109269903A CN201811101738.1A CN201811101738A CN109269903A CN 109269903 A CN109269903 A CN 109269903A CN 201811101738 A CN201811101738 A CN 201811101738A CN 109269903 A CN109269903 A CN 109269903A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/24—Investigating strength properties of solid materials by application of mechanical stress by applying steady shearing forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0025—Shearing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0044—Pneumatic means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/005—Electromagnetic means
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Abstract
The invention discloses a kind of various boundary conditions Lower chains and the tangential drag test device of soil and method, and the device mainly includes rack, chamber, air pressure loading system, motor servo loading system, transmission device, anchor chain units etc..Device setting air bag fills experiment soil sample by movable panel to the lower part and applies vertical pressure, and the moving condition for controlling movable panel simulates different constraint condition；The displacement that motor servo loading system applies is passed into anchor chain by transmission device, and carries out the measurement of power by the force snesor in transmission device.The device of the invention can simulate the constraint condition of Chang Yingli and constant volume, Different Strata pressure can be simulated by air bag, to realize the tangential interaction of anchor chain and soil under measurement various boundary conditions, the calculating that soil section can be entered for engineering anchor chain provides important design parameter, has important references meaning in seabed mud face mooring system design below for anchor point.
Description
Technical field
The present invention relates to a kind of experimental rig more particularly to a kind of various boundary conditions Lower chains and the tangential drag of soil to test
For measuring Different Strata stress various boundary conditions Lower chains and soil relative displacement occurs in the tangential direction for device and method
When drag.
Background technique
In ocean engineering field, it will usually which using anchor foundation and anchor chain, to offshore floating type structures, (such as offshore drilling is flat
Platform, survey platform etc.) it is fixed, most widely used at present is suction anchor, and this anchor foundation usually has certain embedding depth
Degree is usually located at anchor foundation buried depth with the tie point of anchor chain to improve the stress of anchor to play bigger bearing capacity
At 2/3, therefore anchor chain needs certain embedded depth.
Existing research thinks that upper load is transmitted to the load on anchor foundation and mainly cuts with anchor chain and the tangential of soil
Cut phase is closed, and the tangential shear action of anchor chain and soil decides the tension of anchor chain, and then affects the safety of entire mooring system.
In Practical Project, the constraint of the interaction of anchor chain and soil is relative complex, it is considered that constant volume and normal stress are two kinds extreme
Constraint condition.It at present both at home and abroad can be to the tangential shearing of various boundary conditions Lower chains and soil without relevant experimental provision
The device that drag measures, this experimental provision can overcome the disadvantages that the blank of the technical field, and the calculating for entering soil section for engineering anchor chain mentions
For important design parameter.
Summary of the invention
The purpose of the present invention is to provide a kind of various boundary conditions Lower chains and the tangential drag test device of soil and method,
The device can measure various boundary conditions Lower chains and the tangential drag of soil, make up the sky in the calibration of anchor chain and native unit experiment
It is white.The characteristics of device, is: is pressurizeed to the soil in experiment by air bag to simulate the virgin state of stress of the soil body, passes through tune
The constraint control Chang Yingli of movable panel or the constraint condition of constant volume are saved, round-trip lotus is applied by motor servo loading system
It carries, the anchorage tension in experimentation is measured, to calculate the tangential drag of anchor chain and soil.
The present invention takes following technical scheme:
Various boundary conditions Lower chains and the tangential drag test device of soil, including rack, chamber, air pressure loading system,
Motor servo loading system, transmission device, anchor chain unit；Central rack is fixed in the chamber, and top plate is arranged in top,
Air bag, movable panel and experiment soil sample are set gradually under top plate；Movable panel can only be moved longitudinally by air bag driving, and can be led to
It crosses fixed device to fix with test box body, each aperture is equipped with linear slide bearing, left and right two in the left and right sidewall of chamber
One end of the guide rod of linear slide bearing is separately connected with the anchor chain both ends being embedded in soil sample, and the other end and transmission device connect
It connects；Air pressure loading system regulates and controls the pressure in air bag, and the displacement that motor servo loading system applies is passed to anchor by transmission device
Chain, and pass through the measurement of the force snesor progress power in transmission device.
In above-mentioned technical proposal, further, the chamber is by forward and backward two fixed plates, bottom clamping groove plate, removable
It unloads top plate and two blocks of left and right shifting plate is constituted；Several parallel card slots, the embeddable different cards of left and right shifting plate are provided on the clamping groove plate of bottom
The chamber that different volumes are formed in slot is provided with vertical guide groove for movable panel insertion in two fixed plates and realizes longitudinal move
It is dynamic.
Further, the transmission device includes steel strand wires, four fixed pulleys, two force snesors and two hooks；
Four fixed pulleys are fixed on the rack, and are divided into chamber arranged on left and right sides two-by-two, and steel strand wires, which successively bypass four, to be determined
One end connects the first force snesor after pulley, is connected after reconnecting the guide rod of a linear slide bearing by hook and anchor chain one end
It connects, the steel strand wires other end connects the second force snesor, passes through hook and anchor after reconnecting the guide rod of another linear slide bearing
The connection of the chain other end, motor servo loading system are connect with steel strand wires for applying designated displacement.
Further, motor loading system includes servo motor, and servo motor connect specified for applying with steel strand wires
Displacement.
Further, the air pressure loading system includes rectangular air bag, tracheae, pressure gauge and air compressor machine, described
Rectangular air bag is arranged in chamber above movable panel, applies vertical pressure to the soil body by movable panel；Positioned at air bag top
Portion center is provided with air bag gas outlet, is connected by tracheae with air compressor machine, pressure gauge is provided on tracheae.
Further, the anchor chain unit includes 5 single-stranded loops.
The course of work and principle of this test device are as follows:
1) calibration of the intrinsic frictional error of load transfer device is carried out first:
1. plate is moved in left and right to be fixed on the card slot of bottom according to test requirements document, in place by transmission device connection, thin steel rope is used
It substitutes anchor chain (since steel strand wires diameter is smaller, itself and soil body friction can be ignored), thin steel rope is connected with actuating system, passes through electricity
Machine servo loading system is loaded, and entire load transfer device is made to keep tensioning state；
2. carrying out the installation of soil sample according to compactness required for testing；After the completion of sample preparation, movable panel, gas are successively installed
Capsule and top plate, and top plate is fixed by fixing screws.
3. reaching preset pressure according to test requirements document by control air bag internal pressure and being consolidated.If at this time using Chang Yingli
Control (keeps vertical pressure constant) in test, then keeps freely moving up and down for movable panel；If carrying out the control of constant volume
System (keeps the soil body volume in chamber to remain unchanged) in test, after the completion of consolidation, then needs to fix by sliding panel
Screw fixes movable panel and front and back fixed plate, and soil body volume is constant in maintenance chamber；After the completion of consolidating, pass through electricity
Machine servo loading system applies displacement, measures the tangential drag between steel wire and soil by force snesor.
4. the intrinsic frictional error of load transfer device is denoted as T1, note left and right force snesor registration is f1With f2, then T1=| f1-f2|。
2) test of the tangential drag of anchor chain and soil is carried out:
The anchor chain unit that the thin steel rope of above-mentioned calibration process changes test requirements document into is tested, test process, air bag pressure
Power, movable panel state, motor servo loading system are identical as step 1), if this time two force snesor registrations are F1、F2,
It is possible thereby to measure the tangential drag F=of the soil body and anchor chain | F1-F2|-T1=| F1-F2|-|f1-f2|.Dress proposed by the present invention
It sets, the tangential phase interaction of (Chang Yingli and constant volume) Different Strata pressure Lower chains with soil can be simulated under various boundary conditions
With test parameters can be provided for the model of engineering anchor chain and soil interaction, to mooring system, (mentioning not is related in soil
Section) design have important references meaning.
Detailed description of the invention
Fig. 1 is a kind of specific structure main view of apparatus of the present invention；
Fig. 2 is the top view of Fig. 1 device of the present invention；
Fig. 3 is a kind of specific structure main view sectional view of chamber；
Fig. 4 is the top cross-sectional view of Fig. 3 chamber；
Fig. 5 is the side view of Fig. 3 chamber；
Fig. 6 is device rough schematic view and stress on anchor chain schematic diagram.
Wherein, plate 6, areole are moved in rack post 1, desktop 2, pulley bracket 3, front and back fixed plate 4, bottom clamping groove plate 5, left and right
7, linear slide bearing 8, top plate fixing screws 9, detachable roof 10, roof hole 11, vertical guide groove 12, movable panel 13, cunning
Movable plate fixing screws 14, air bag gas outlet 16, tracheae 17, pressure gauge 18, air compressor machine 19, servo motor 20, are slided rectangular air bag 15
Wheel 21, steel strand wires 22, force snesor 23, linear bearing guide rod 24, hook 25, anchor chain unit 26.
Specific embodiment
Referring to Fig.1-4, a kind of various boundary conditions Lower chains of the invention and the tangential drag test device of soil, including machine
Frame, chamber, air pressure loading system, motor servo loading system, transmission device, anchor chain unit etc..The chamber is fixed
In central rack, top plate is arranged in top, and air bag, movable panel and experiment soil sample are set gradually under top plate；Movable panel is by gas
Capsule driving can only move longitudinally, and can be fixed by fixed device with test box body, respectively open in the left and right sidewall of chamber
Hole is equipped with linear slide bearing, one end of the guide rod of two linear slide bearings in left and right and the anchor chain both ends point being embedded in soil sample
It does not connect, the other end is connect with transmission device；Air pressure loading system regulates and controls the pressure in air bag, and transmission device adds motor servo
The displacement that loading system applies passes to anchor chain, and the measurement of power is carried out by the force snesor in transmission device.
The rack is main in illustrated example for being fixed to chamber and providing support for transmission device
It is made of rack post 1, desktop 2, pulley bracket 3 etc..1 supporting desktop 2 of rack post, pulley bracket 3 are fixed on rack platform.
In this example, the chamber mainly includes front and back fixed plate 4, bottom clamping groove plate 5, left and right shifting plate 6, side wall
Hole 7, linear slide bearing 8, top plate fixing screws 9, detachable roof 10, roof hole 11, vertical guide groove 12, movable panel 13,
Sliding panel fixing screws 14 etc..The parallel fixed length 50cm on the table in 4 front and back of forward and backward fixed plate, is divided into 20cm；Bottom card
Several parallel card slots, card slot interval 5cm, for fixing left and right shifting plate 6 are set on frid 5；Areole is set on left and right shifting plate 6
7, linear slide bearing 8 is installed on areole 7；Top plate fixing screws 9 are arranged in forward and backward fixed plate top, for fixed detachable
Top plate 10；A roof hole 11 is arranged in 10 central part of top plate, for tracheae to be pierced by；Furthermore it is designed on the inside of the fixed plate 4 of front and back
Movable panel 13 can be installed to vertical guide groove 12, only allow sliding vertically for movable panel 13 by two vertical guide grooves 12；It can
The fixation of movable plate 13 can be fixed in front and back fixed plate 4 by sliding panel fixing screws 14, or fixed device by other and realized admittedly
It is fixed.
The air pressure loading system mainly include rectangular air bag 15, air bag gas outlet 16, tracheae 17, pressure gauge 18 and
Air compressor machine 19, the rectangular air bag 15 is placed between test roof box 10 and movable panel 13, right by movable panel 13
The soil body applies vertical pressure；Air bag gas outlet 16 is located at air bag top center, is connected with tracheae 17, pressure gauge is provided on tracheae
18 can measure pressure in air bag 15；Tracheae 17 is connected with air compressor machine 19, air compressor machine SERVO CONTROL, maintains inside air bag 15
Pressure reaches preset value.
The motor loading system mainly includes servo motor 20, applies specified displacement for connecting with steel strand wires,
Make anchor chain and soil that relative motion occur by transmission device.
The transmission system includes including 21, two, the fixed pulley force snesor 23 of steel strand wires 22, four and two hooks
25；Four fixed pulleys are fixed on the rack, and are divided into chamber arranged on left and right sides two-by-two, and steel strand wires successively bypass four
One end connects the first force snesor after fixed pulley, reconnects after the guide rod 24 of a linear slide bearing through hook and anchor chain
One end connection, the steel strand wires other end connect the second force snesor, pass through extension after reconnecting the guide rod of another linear slide bearing
Hook is connect with the anchor chain other end, and motor servo loading system is connect with steel strand wires for applying designated displacement.
The anchor chain unit 26 is generally there are five single-stranded loop, and chain link is very few to will lead to measurement inaccuracy, and chain link is excessive, will
There are requirements at the higher level to test apparatus.
The course of work and principle of this test device are as follows:
1) calibration of the intrinsic frictional error of load transfer device is carried out first:
1. plate is moved in left and right to be fixed on the card slot of bottom according to test requirements document, in place by transmission device connection, thin steel rope is used
It substitutes anchor chain (since steel strand wires diameter is smaller, itself and soil body friction can be ignored), thin steel rope is connected with actuating system, passes through electricity
Machine servo loading system is loaded, and entire load transfer device is made to keep tensioning state；
2. carrying out the installation of soil sample according to compactness required for testing；After the completion of sample preparation, movable panel, gas are successively installed
Capsule and top plate, and top plate is fixed by fixing screws.
3. reaching preset pressure according to test requirements document by control air bag internal pressure and being consolidated.If at this time using Chang Yingli
Control (keeps vertical pressure constant) in test, then keeps freely moving up and down for movable panel；If carrying out the control of constant volume
System (keeps the soil body volume in chamber to remain unchanged) in test, after the completion of consolidation, then needs to fix by sliding panel
Screw fixes movable panel and front and back fixed plate, and soil body volume is constant in maintenance chamber；After the completion of consolidating, pass through electricity
Machine servo loading system applies displacement, measures the tangential drag between steel wire and soil by force snesor.
4. the intrinsic frictional error of load transfer device is denoted as T1, note left and right force snesor registration is f1With f2, then T1=| f1-f2|。
2) test of the tangential drag of anchor chain and soil is carried out:
The anchor chain unit that the thin steel rope of above-mentioned calibration process changes test requirements document into is tested, test process, air bag pressure
Power, movable panel state, motor servo loading system are identical as step 1), if this time two force snesor registrations are F1、F2,
It is possible thereby to measure the tangential drag F=of the soil body and anchor chain | F1-F2|-T1=| F1-F2|-|f1-f2|。
Claims (7)
1. various boundary conditions Lower chains and the tangential drag test device of soil, which is characterized in that including rack, chamber, air pressure
Loading system, motor servo loading system, transmission device, anchor chain unit；Central rack is fixed in the chamber, top
Top plate is set, air bag, movable panel and experiment soil sample are set gradually under top plate；Movable panel can only be moved along longitudinal direction by air bag driving
It is dynamic, and can be fixed by fixed device with test box body, each aperture is equipped with linear slide axis in the left and right sidewall of chamber
It holds, one end of the guide rod of two linear slide bearings in left and right is separately connected with the anchor chain both ends being embedded in soil sample, the other end and biography
Dynamic device connection；Air pressure loading system regulates and controls the pressure in air bag, the displacement that transmission device applies motor servo loading system
Anchor chain is passed to, and carries out the measurement of power by the force snesor in transmission device.
2. various boundary conditions Lower chains according to claim 1 and the tangential drag test device of soil, which is characterized in that institute
The chamber stated is made of two blocks of forward and backward two fixed plates, bottom clamping groove plate, detachable roof and left and right shifting plates；Bottom card slot
Several parallel card slots are provided on plate, it is left and right to move the chamber that different volumes are formed in the embeddable different card slots of plate, admittedly at two pieces
It is provided with vertical guide groove on fixed board and is embedded in realization longitudinal movement for movable panel.
3. various boundary conditions Lower chains according to claim 1 and the tangential drag test device of soil, which is characterized in that institute
The transmission device stated includes steel strand wires, four fixed pulleys, two force snesors and two hooks；Four fixed pulleys are fixed
On the rack, and two-by-two it is divided into chamber arranged on left and right sides, one end connects the first power after steel strand wires successively bypass four fixed pulleys
Sensor is connect by hook with anchor chain one end after reconnecting the guide rod of a linear slide bearing, the connection of the steel strand wires other end
Second force snesor is connect by hook with the anchor chain other end after reconnecting the guide rod of another linear slide bearing, and motor is watched
Loading system is taken to connect with steel strand wires for applying designated displacement.
4. various boundary conditions Lower chains according to claim 1 and the tangential drag test device of soil, which is characterized in that institute
The motor loading system stated includes servo motor, and servo motor is connect for applying specified displacement with steel strand wires.
5. various boundary conditions Lower chains according to claim 1 and the tangential drag test device of soil, which is characterized in that institute
The air pressure loading system stated includes rectangular air bag, tracheae, pressure gauge and air compressor machine, and the rectangular air bag is arranged in chamber
Above interior movable panel, vertical pressure is applied to the soil body by movable panel；It is provided with air bag gas outlet positioned at air bag top center,
It is connected by tracheae with air compressor machine, pressure gauge is provided on tracheae.
6. various boundary conditions Lower chains according to claim 1 and the tangential drag test device of soil, which is characterized in that institute
The anchor chain unit stated includes 5 single-stranded loops.
7. special using the method for device as described in claim 1 measurement various boundary conditions Lower chains and the tangential drag of soil
Sign is, includes the following steps:
1) calibration of the intrinsic frictional error of load transfer device is carried out first:
1. plate is moved in left and right to be fixed on the card slot of bottom according to test requirements document, in place by transmission device connection, substituted with thin steel rope
Thin steel rope is connected with actuating system, is loaded by motor servo loading system by anchor chain, and entire load transfer device is made to keep opening
Tight state；
2. carrying out the installation of soil sample according to compactness required for testing；After the completion of sample preparation, successively install movable panel, air bag and
Top plate, and top plate is fixed by fixing screws.
3. reaching preset pressure according to test requirements document by control air bag internal pressure and being consolidated.If at this time using normal Stress Control,
Then keep freely moving up and down for movable panel；If the control for carrying out constant volume then needs to pass through sliding panel after the completion of consolidation
Fixing screws fix movable panel and front and back fixed plate, and soil body volume is constant in maintenance chamber；After the completion of consolidating, lead to
It crosses motor servo loading system and applies displacement, the tangential drag between steel wire and soil is measured by force snesor.
4. the intrinsic frictional error of load transfer device is denoted as T1, note left and right force snesor registration is f1With f2, then T1=| f1-f2|。
2) test of the tangential drag of anchor chain and soil is carried out:
The anchor chain unit that the thin steel rope of above-mentioned calibration process changes test requirements document into is tested, test process, gasbag pressure, can
Mobile board status, motor servo loading system are identical as step 1), if this time two force snesor registrations are F1、F2, thus may be used
To measure the tangential drag F=of the soil body and anchor chain | F1-F2|-T1=| F1-F2|-|f1-f2|。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811101738.1A CN109269903B (en) | 2018-09-20 | 2018-09-20 | Device and method for testing tangential resistance of anchor chain and soil under different constraint conditions |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811101738.1A CN109269903B (en) | 2018-09-20 | 2018-09-20 | Device and method for testing tangential resistance of anchor chain and soil under different constraint conditions |
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| Publication Number | Publication Date |
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| CN109269903A true CN109269903A (en) | 2019-01-25 |
| CN109269903B CN109269903B (en) | 2020-08-04 |
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| CN110146245A (en) * | 2019-04-30 | 2019-08-20 | 宁波大学 | A kind of model measurement device of the anti-horizontal direction ocean current impact of bottom-sitting type cultivation platform |
| CN112082875A (en) * | 2020-09-17 | 2020-12-15 | 大连理工大学 | In-situ soil body parameter measuring device based on pressure penetration |
| CN116087773A (en) * | 2023-04-07 | 2023-05-09 | 深圳市创达电子有限公司 | Dynamic load simulation device of brushless direct current motor and application method thereof |
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|---|---|
| CN109269903B (en) | 2020-08-04 |
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