CN107829451A - Horizontal bidirectional cyclic load loading device and test method based on model casing - Google Patents
Horizontal bidirectional cyclic load loading device and test method based on model casing Download PDFInfo
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- CN107829451A CN107829451A CN201711109609.2A CN201711109609A CN107829451A CN 107829451 A CN107829451 A CN 107829451A CN 201711109609 A CN201711109609 A CN 201711109609A CN 107829451 A CN107829451 A CN 107829451A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2600/00—Miscellaneous
- E02D2600/10—Miscellaneous comprising sensor means
Abstract
The present invention relates to ocean pile foundation engineering research field, it is desirable to provide a kind of horizontal bidirectional cyclic load loading device and test method based on model casing.Model casing in the device is open-topped cube box-structure, and its internal fill stratum, soil layer fills water on surface；Fixed pulley is respectively provided with two adjacent edges of model casing.Loading system includes two sets of identical charging assemblies and loaded for power loop control；Monitoring system includes data collector, and data collector is respectively connecting to dynamometer, foil gauge and displacement transducer by cable.The present invention can simulate the cyclic load effects such as offshore pile basis wind-engaging sudden and violent load, wave load in model casing.The arrangement achieves the CYCLIC LOADING of two orthogonal horizontal directions, real simulation is realized.Different two-dimensional level cyclic loads is exported by changing the conditions such as load amplitude, cycle frequency, cycle-index, simulates the superposition of load under a variety of natural conditions.
Description
Technical field
The present invention is on ocean pile foundation engineering research field, and it is two-way to be related to a kind of two-dimensional level based on model casing experiment
Cyclic load loading device and test method.
Background technology
With the continuous expansion of ocean development construction, the ocean engineering construction based on stake is more and more, such as sea turn
Power generator, offshore oil drilling platform, power transmission tower etc..Under afloat particular surroundings, as the Long-term Cyclic Loading of stormy waves is made
With the design to pile foundation brings very big challenge.Cyclic load can cause pile peripheral earth accumulated deformation and plastic strain
Increase so that superstructure tilts excessive, pile peripheral earth Stiffness, and bearing capacity of pile foundation reduces.
Due to the complexity of marine natural situation, acting on the directions such as wave load, the wind load in pile foundation level direction has
Not confirmability, offshore platform pile foundation has the cyclic load that horizontal bidirectional is subject in the case of a big chunk, relative to conventional
One-dimensional horizontal CYCLIC LOADING research, apply two-way horizontal cyclic load to Yu Haiyang pile foundation circulate reduction rule research have more
Authenticity and accuracy.Biaxial loadings, which are acted under the more unidirectional load action of bearing capacity for causing stake, obvious change.Followed two-way
Under ring load action, the strength and stiffness of stake have larger difference compared with one-way circulation load action.
But the research at present for the stake by two-way horizontal cyclic load is very limited, in Practical Project in order to ensure
Safety, the method for amplification safety coefficient is taken, so as to generate larger waste.Therefore, pile foundation is studied to circulate in two-way horizontal
Character under load action changes, and has larger benefit for improving social benefit and economic interests.
The content of the invention
The technical problem to be solved in the present invention is to overcome the deficiencies in the prior art, there is provided one kind is based on model casing
Horizontal bidirectional cyclic load loading device and test method.
To solve technical problem, solution of the invention is：
A kind of horizontal bidirectional cyclic load loading device based on model casing, including model casing, loading system and prison are provided
Examining system, the concrete structure and annexation of each system are：
The model casing is open-topped cube box-structure, its inner lower filling soil layer, soil layer surface and case
Space dress water between body upper limb；First fixed pulley is respectively provided with two adjacent edges of model casing；Model casing
Center is provided with a Model Pile, and its latter half is inserted vertically into soil layer；
The loading system includes two sets of identical charging assemblies：There is a power loop control loading in charging assembly
Device, power loop control loading device include fixed base, two supports being connected with rotating shaft are set on base；The rotating shaft is passed through
The through hole being arranged on rectangle balance twin beams, enables balance twin beams to be swung centered on rotating shaft；The balance of rotating shaft both sides
Twin beams is asymmetric, wherein the end of slightly shorter lateral balance twin beams is equipped with counterpoise；The end of a slightly long lateral balance twin beams
Top is equipped with motor, and motor shaft vertical is passed down through the end of balance twin beams；The bull stick of a piece horizontal direction, its one end are fixed on
The end of motor shaft, the other end are fixed and a counterweight are housed；Motor and balance twin beams rotating shaft between, be fixed with one with
The cross bar of shaft parallel, the second fixed pulley is housed on cross bar；One end that motor is housed on twin beams is balanced away from Model Pile, equipped with flat
One end of weighing apparatus counterweight is close to Model Pile；One end of first steel strand wires is fixed on base by the second fixed pulley, and the other end is fixed
On the draw ring at the top of Model Pile；One end of second steel strand wires is fixed on the draw ring at the top of Model Pile, and the other end passes through first
Weights are connected after fixed pulley；First steel strand wires and the second fixed pulley, Model Pile, the second steel strand wires, the first fixed pulley institute shape
Into line be a straight line perpendicular to model casing edge, and the line in two sets of charging assemblies is also orthogonal；
The monitoring system includes data collector, and data collector is respectively connecting to dynamometer, foil gauge by cable
And displacement transducer；Wherein, dynamometry is attached separately on the first steel strand wires in two sets of charging assemblies in respect of two；Foil gauge has
It is multiple, be pasted onto on the outside of the Model Pile in soil layer by load axis, it is and evenly distributed in stake length direction, in stake footpath
Arrangement on direction is identical with horizontal bidirectional load-bearing direction；Displacement transducer is mounted in the cable between Model Pile and model chamber interior wall
On, the cable is located at the lower section of the second steel strand wires.
In the present invention, each stock equipped with horizontal direction on two adjacent vertical edges of model casing, described the
One fixed pulley is mounted in the centre of stock.
In the present invention, the line for installing displacement transducer has more, and a displacement is respectively housed on every cable
Sensor；The cable is located at the part that Model Pile exposes soil layer, and 10cm is spaced between neighbouring both threads cable.
In the present invention, four sides of the model casing and bottom are steel plate；The bottom of four sides is provided with uniform cloth
The osculum put, filter screen is housed in osculum.
In the present invention, the Model Pile is hollow steel pipe, with the cable that each foil gauge connects in the inner chamber through Model Pile
Connect afterwards with data collector.
In the present invention, the draw ring at the top of the Model Pile includes being buckled in the steel hat shape body at the top of Model Pile, its outside
It is connected with the circular draw ring for being mutually perpendicular to four direction.
In the present invention, the data collector is computer.
Invention further provides the method that wave load load test is carried out using aforementioned means, including following step
Suddenly：
(1) banket
Soil layer is divided into the sandy gravel stratum of lower floor and the clay layer on upper strata；The first laying depth 10cm in model casing sandy gravel stratum,
Then permeable geotextiles are laid on sandy gravel stratum, recharge clay；The filling of clay is carried out by layer, the 15~20cm that often bankets compactings
And water filling, make the abundant saturation of the soil body；Next layer of clay is filled out after standing again, after the completion of every layer of soil filling, ensures the surface water of soil layer
It is flat, and shaving processing is carried out before filling is continued, avoid artificially being layered；The final upper surface of soil layer is less than the upper limb of model casing
At least more than 10cm；
(2) consolidate
After the completion of soil layer filling, it is abound with preloading on its surface and is consolidated；Record consolidation time simultaneously tests the degree of consolidation, adopts
Degree of consolidation judgement is carried out with penetration test, the control degree of consolidation is in the range of 85%~93%；In consolidation process, according to experiment
Need to open or close the osculum of model casing bottom, for simulating the process of saturation not draining or saturation draining；Consolidate
Cheng Hou, permeable geotextiles are laid on model casing soil layer surface；
(3) Model Pile is loaded
Needed to select the steel pipe of piles with different footpath and length to contact with clay in Model Pile outer as Model Pile according to experiment
Surface mount foil gauge, evenly distributed in stake length direction, the arrangement of stake footpath direction is identical with horizontal bidirectional load-bearing direction, foil gauge
Outside applies epoxy resin and is protected by, and foil gauge wire passes out of Model Pile；By the consolidation soil of Model Pile press-in specified location
It is interior, Model Pile embedded depth is determined according to different tests type and stake footpath size, so that it is determined that dress soil height.Expose in Model Pile
Displacement transducer is installed on cable between the part of soil layer and model chamber interior wall；
(4) instrument and equipment is installed
A, the mounting bracket on base, balance twin beams, rotating shaft and support are linked together, in balance twin beams one end successively
Motor, bull stick and counterweight are installed, temporarily fixed bull stick is allowed to perpendicular to equalizer bar；In balance twin beams other end installation balance weight
Code, ensures balance of the whole power loop control loading device before CYCLIC LOADING；
B, fixed model stake, to Model Pile exposure in the upper part of soil layer with the support of horizontal direction temporarily to fix, protect
Model of a syndrome stake be not subjected to displacement before by cyclic load；
C, steel strand wires are connected, the second steel strand wires and stake end draw ring are connected first, then increase weights；Then
Connect the first steel strand wires；
D, whole loading device balance is adjusted, removes the horizontal support of fixed model stake, adjustment counterpoise is double in balance
The position of beam one end, until dynamometer reading is consistent with the value of weights, ensure CYCLIC LOADING system before being initiated be
System balance；
E, dynamometer line is arranged, itself and data collector are connected；
F, the step of repeating above a-e, the charging assembly in another horizontal vertical direction is installed；
(5) water filling
Water is injected to soil layer superjacent air space, the height of the final water surface is maintained at 10cm；
(6) tested
Set the cyclic load frequency of motor and the frequency acquisition of data collector, dynamometer, foil gauge and displacement sensing
Device collects the data monitored and is sent to data collector, and real-time display simultaneously records test data；Set before experiment is reached
Cyclic load loading number, or stake top add up horizontal displacement exceed setting value make pile body occur unstable failure when, off-test,
Gained test data is used for post-processing.
9th, according to the method for claim 8, it is characterised in that be pressed into Model Pile in the consolidation soil of specified location
When, for the cable inside protection Model Pile, conical pullover is additionally arranged at the bottom in Model Pile.
Compared with prior art, the beneficial effects of the present invention are：
The present invention can simulate the cyclic load effects such as offshore pile basis wind-engaging sudden and violent load, wave load in model casing.Phase
Than in other cyclic load loading devices, the arrangement achieves the CYCLIC LOADING of two orthogonal horizontal directions, realizing
Real simulation.Different two-dimensional level circulation lotuses is exported by changing the conditions such as load amplitude, cycle frequency, cycle-index
Carry, simulate the superposition of load under a variety of natural conditions.
Brief description of the drawings
Fig. 1 is the power loop control loading device schematic diagram of apparatus of the present invention.
Fig. 2 is the CYCLIC LOADING system longitudinal section in one direction of apparatus of the present invention.
Fig. 3 is apparatus of the present invention loading system top view.
In figure mark for：Model casing 1, sandy gravel stratum 2, clay layer 3, power loop control loading device 4, base 5, balance twin beams
6, rotating shaft 7, motor 8, bull stick 9, counterweight 10, counterpoise 11, weights 12, the first fixed pulley 13, the first steel strand wires 14, survey
Power meter 15, data collector 16, foil gauge 17, displacement transducer 18, Model Pile 19, support 20, stock 21, the second fixed pulley
22。
Embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings：
Horizontal bidirectional cyclic load loading device based on model casing, including model casing 1, loading system and monitoring system,
The concrete structure and annexation of each system be：
Model casing 1 is open-topped cube box-structure, its inner lower filling soil layer, soil layer surface with casing
Space dress water between edge；Four sides of model casing 1 and bottom are steel plate；The bottom of four sides is provided with what is be evenly arranged
Osculum, filter screen is housed in osculum.Soil layer is divided into the sandy gravel stratum 2 of lower floor and the clay layer 3 on upper strata, and the thickness of sandy gravel stratum 2 is
10cm, distance is at least 10cm between the surface of clay layer 3 and casing upper limb；On two adjacent vertical edges of model casing 1
Stock 21 respectively equipped with a horizontal direction, the centre of stock 21 is respectively provided with first fixed pulley 13；The center of model casing 1
Provided with a Model Pile 19, its latter half is inserted vertically into soil layer.
The loading system includes two sets of identical charging assemblies：There is a power loop control loading in charging assembly
Device 4, power loop control loading device include fixed base 5, two supports 20 being connected with rotating shaft 7 are set on base 5；Should
The through hole that rotating shaft 7 runs through on balance twin beams 6, enables balance twin beams 6 to be swung centered on rotating shaft 7；The both sides of rotating shaft 7
It is asymmetric to balance twin beams 6, wherein the end of slightly shorter lateral balance twin beams 6 is equipped with counterpoise 11；A slightly long lateral balance is double
Motor 8 is housed, motor shaft vertical is passed down through the end of balance twin beams 6 above the end of beam 6；The bull stick 9 of a piece horizontal direction,
Its one end is fixed on the end of motor shaft, and the other end is fixed and a counterweight 10 is housed；Motor 8 with balance twin beams 6 rotating shaft 7 it
Between, a cross bar parallel with rotating shaft 7 is fixed with, the second fixed pulley 22 is housed on cross bar；Motor 8 is housed on balance twin beams 6
One end away from Model Pile 19, one end equipped with counterpoise 11 is close to Model Pile 19；One end of first steel strand wires 14 passes through
Two fixed pulleys 22 are fixed on base 5, and the other end is fixed on the draw ring at the top of Model Pile 19；One end of second steel strand wires 22 is consolidated
It is scheduled on the draw ring at the top of Model Pile 19, the other end is by connecting weights 12 after the first fixed pulley 13；The top of Model Pile 19
Draw ring include the steel hat shape body for being buckled in the top of Model Pile 19, its outside is connected with the circular drawing for being mutually perpendicular to four direction
Ring.The line that first steel strand wires 14 are formed with the second fixed pulley 22, Model Pile 19, the second steel strand wires, the first fixed pulley 13 is
One straight line perpendicular to the edge of model casing 1, and the line in two sets of charging assemblies is also orthogonal；
The monitoring system includes data collector 16 (computer), and data collector 16 is respectively connecting to survey by cable
Power meter 15, foil gauge 17 and displacement transducer 18；Wherein, dynamometer 15 has two, be attached separately in two sets of charging assemblies
On one steel strand wires 14；Foil gauge 17 have multiple, to be pasted onto in soil layer outsides of Model Pile 19 by load axis, and
Evenly distributed in stake length direction, the arrangement on the direction of stake footpath is identical with horizontal bidirectional load-bearing direction；Model Pile 19 is hollow steel
Pipe, the cable to connect with each foil gauge 17 connect behind the inner chamber through Model Pile 19 with data collector 16.Displacement transducer
18 on the cable between Model Pile 19 and the inwall of model casing 1, and the cable for installing displacement transducer 18 has more, every
One displacement transducer 18 is respectively housed on cable；The cable is located at the part that Model Pile 19 exposes soil layer, neighbouring two
10cm is spaced between cable, all cables are respectively positioned on the lower section of the second steel strand wires.
In the present invention, using the method for described device progress wave load load test, comprise the following steps：
(1) banket
Soil layer is divided into the sandy gravel stratum 2 of lower floor and the clay layer 3 on upper strata；The first laying depth 10cm in model casing 1 gravel
Layer 2, permeable geotextiles are then laid on sandy gravel stratum 2, recharge clay 3；The filling of clay is carried out by layer, often banket 15~
20cm compactings and water filling, make the abundant saturation of the soil body；Next layer of clay is filled out after standing again, after the completion of every layer of soil filling, ensures soil layer
Surface it is horizontal, and shaving processing is carried out before filling is continued, avoids artificially being layered；The final upper surface of soil layer is less than model
The upper limb of case 1 at least more than 10cm；
(2) consolidate
After the completion of soil layer filling, it is abound with preloading on its surface and is consolidated；Record consolidation time simultaneously tests the degree of consolidation, adopts
Degree of consolidation judgement is carried out with penetration test, the control degree of consolidation is in the range of 85%~93%；In consolidation process, according to experiment
Need to open or close the osculum of the bottom of model casing 1, for simulating the process of saturation not draining or saturation draining；Consolidate
Cheng Hou, permeable geotextiles are laid on the soil layer surface of model casing 1；
(3) Model Pile is loaded
The steel pipe for needing to select piles with different footpath and length according to experiment contacts as Model Pile 19 in Model Pile 19 with clay
Outer surface paste foil gauge 17, it is evenly distributed in stake length direction, stake footpath direction arrangement it is identical with horizontal bidirectional load-bearing direction, answer
The outside painting epoxy resin for becoming piece 17 is protected by, and the wire of foil gauge 17 passes out of Model Pile 19；The press-in of Model Pile 19 is referred to
Position in the consolidation soil put, expose in Model Pile 19 and displacement biography is installed on the cable between the part of soil layer and the inwall of model casing 1
Sensor 18；When Model Pile 19 is pressed into the consolidation soil of specified location, to protect the cable inside Model Pile 19, in Model Pile 19
Be additionally arranged at the bottom conical pullover.
(4) instrument and equipment is installed
A, the mounting bracket 20 on base 5, balance twin beams 6, rotating shaft 7 and support 20 are linked together, in balance twin beams 6
Motor 8, bull stick 9 and counterweight 10 are installed in one end successively, and temporarily fixed bull stick 9 is allowed to perpendicular to balance twin beams 6；In balance twin beams 6
The other end installs counterpoise 11, ensures balance of the whole power loop control loading device 4 before CYCLIC LOADING；
B, fixed model stake 19, to the exposure of Model Pile 19 in the upper part horizontal direction of soil layer support with temporarily solid
It is fixed, ensure that Model Pile 19 be not subjected to displacement before by cyclic load；
C, steel strand wires are connected, first connect the second steel strand wires and stake end draw ring, then increase weights 12；So
After connect the first steel strand wires 14；
D, whole loading device balance is adjusted, removes the horizontal support of fixed model stake 19, adjustment counterpoise 11 is flat
The position of weighing apparatus twin beams 6 one end, until the reading of dynamometer 15 is consistent with the value of weights 12, guarantee CYCLIC LOADING system is starting
System balancing before；
E, the line of dynamometer 15 is arranged, itself and data collector 16 are connected；
F, the step of repeating above a-e, the charging assembly in another horizontal vertical direction is installed；
(5) water filling
Water is injected to soil layer superjacent air space, the height of the final water surface is maintained at 10cm；
(6) tested
Set the cyclic load frequency of motor 8 and the frequency acquisition of data collector 16, dynamometer 15, foil gauge 17 and position
Displacement sensor 18 collects the data monitored and is sent to data collector 16, and real-time display simultaneously records test data；When reaching
The cyclic load loading number of setting before experiment, or the accumulative horizontal displacement of stake top exceed setting value and make pile body that unstable failure occur
When, off-test, gained test data is used for post-processing.
During experiment, by applying two-way horizontal cyclic load to Model Pile and monitoring in real time, research model stake exists
Working characteristics, bearing capacity reduction situation under two-way horizontal cyclic load and the coverage to the periphery soil body.Two sets add
Power loop control loading device 4 in load component is into horizontal vertical direction arrangement, the cyclic load F that can be provided, and size is：In formula, L1Grown for bull stick 9, L2For distance, m between rotating shaft 7 and fixed pulley 13 on base 5aFor weight
10 mass of code, T are the intrinsic moment of torsion of power loop control loading device 4, and M is the mass of bull stick 9.
Horizontal bidirectional cyclic load loading device in the present invention is easy to process, and Standard is simple, has certain section
Grind promotional value.Described above is the preferred embodiment of the present invention, it should be pointed out that：For the ordinary skill people of the art
For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (9)
1. a kind of horizontal bidirectional cyclic load loading device based on model casing, including model casing；Characterized in that, also include adding
Loading system and monitoring system, the concrete structure and annexation of each system are：
The model casing is open-topped cube box-structure, its inner lower filling soil layer, soil layer surface with casing
Space dress water between edge；First fixed pulley is respectively provided with two adjacent edges of model casing；The center of model casing
Provided with a Model Pile, its latter half is inserted vertically into soil layer；
The loading system includes two sets of identical charging assemblies：There is a power loop control loading dress in charging assembly
Put, power loop control loading device includes fixed base, and two supports being connected with rotating shaft are set on base；The rotating shaft runs through
Through hole on rectangle balance twin beams, enables balance twin beams to be swung centered on rotating shaft；The balance of rotating shaft both sides is double
Beam is asymmetric, wherein the end of slightly shorter lateral balance twin beams is equipped with counterpoise；On the end of a slightly long lateral balance twin beams
Side is equipped with motor, and motor shaft vertical is passed down through the end of balance twin beams；The bull stick of a piece horizontal direction, its one end are fixed on electricity
The end of arbor, the other end are fixed and a counterweight are housed；Between the rotating shaft of motor and balance twin beams, one is fixed with turning
The parallel cross bar of axle, the second fixed pulley is housed on cross bar；One end that motor is housed on twin beams is balanced away from Model Pile, equipped with balance
One end of counterweight is close to Model Pile；One end of first steel strand wires is fixed on base by the second fixed pulley, and the other end is fixed on
On draw ring at the top of Model Pile；One end of second steel strand wires is fixed on the draw ring at the top of Model Pile, and the other end is fixed by first
Weights are connected after pulley；First steel strand wires are formed with the second fixed pulley, Model Pile, the second steel strand wires, the first fixed pulley
Line be a straight line perpendicular to model casing edge, and the line in two sets of charging assemblies is also orthogonal；
The monitoring system includes data collector, and data collector is respectively connecting to dynamometer, foil gauge and position by cable
Displacement sensor；Wherein, dynamometry is attached separately on the first steel strand wires in two sets of charging assemblies in respect of two；Foil gauge have it is multiple,
Be pasted onto on the outside of the Model Pile in the soil layer by load axis, it is and evenly distributed in stake length direction, in stake footpath direction
On arrangement it is identical with horizontal bidirectional load-bearing direction；Displacement transducer is mounted on the cable between Model Pile and model chamber interior wall,
The cable is located at the lower section of the second steel strand wires.
2. device according to claim 1, it is characterised in that one is respectively equipped with two adjacent vertical edges of model casing
The stock of root horizontal direction, first fixed pulley are mounted in the centre of stock.
3. device according to claim 1, it is characterised in that the cable for installing displacement transducer has more,
One displacement transducer is respectively housed on every cable；The line is located at the part that Model Pile exposes soil layer, neighbouring two
10cm is spaced between cable.
4. device according to claim 1, it is characterised in that four sides of the model casing and bottom are steel plate；
The bottom of four sides is provided with the osculum being evenly arranged, and filter screen is housed in osculum.
5. device according to claim 1, it is characterised in that the Model Pile is hollow steel pipe, is connected with each foil gauge
Cable connect behind the inner chamber through Model Pile with data collector.
6. device according to claim 1, it is characterised in that the draw ring at the top of the Model Pile includes being buckled in model stake top
The steel hat shape body in portion, its outside are connected with the circular draw ring for being mutually perpendicular to four direction.
7. device according to claim 1, it is characterised in that the data collector is computer.
8. the method for wave load load test is carried out using claim 1 described device, it is characterised in that including following step
Suddenly：
(1) banket
Soil layer is divided into the sandy gravel stratum of lower floor and the clay layer on upper strata；The first laying depth 10cm in model casing sandy gravel stratum, then
Permeable geotextiles are laid on sandy gravel stratum, recharge clay；The filling of clay is carried out by layer, and the 15~20cm that often bankets is compacted and noted
Water, make the abundant saturation of the soil body；Next layer of clay is filled out after standing again, after the completion of every layer of soil filling, ensures that the surface of soil layer is horizontal, and
Shaving processing is carried out before filling is continued, avoids artificially being layered；The final upper surface of soil layer is less than the upper limb of model casing at least
More than 10cm；
(2) consolidate
After the completion of soil layer filling, it is abound with preloading on its surface and is consolidated；Record consolidation time simultaneously tests the degree of consolidation, using pin
Penetration test carries out degree of consolidation judgement, and the control degree of consolidation is in the range of 85%~93%；In consolidation process, according to experiment needs
The osculum of model casing bottom is opened or closed, for simulating the process of saturation not draining or saturation draining；After the completion of consolidation,
Permeable geotextiles are laid on model casing soil layer surface；
(3) Model Pile is loaded
The steel pipe for needing to select piles with different footpath and length according to experiment is as Model Pile, in the outer surface that Model Pile contacts with clay
Foil gauge is pasted, evenly distributed in stake length direction, stake footpath direction arranges, the outside of foil gauge identical with horizontal bidirectional load-bearing direction
Apply epoxy resin to be protected by, foil gauge wire passes from Model Pile inner chamber；Model Pile is pressed into the consolidation soil of specified location,
Expose in Model Pile and displacement transducer is installed on the cable between the part of soil layer and model chamber interior wall；
(4) instrument and equipment is installed
A, the mounting bracket on base, balance twin beams, rotating shaft and support are linked together, installed successively in balance twin beams one end
Motor, bull stick and counterweight, temporarily fix bull stick and be allowed to perpendicular to balance twin beams；Counterpoise is installed in the balance twin beams other end,
Ensure balance of the whole power loop control loading device before CYCLIC LOADING；
B, fixed model stake, to Model Pile exposure in the upper part of soil layer with the support of horizontal direction temporarily to fix, ensure mould
Type stake be not subjected to displacement before by cyclic load；
C, steel strand wires are connected, the second steel strand wires and stake end draw ring are connected first, then increase weights；Then connect
First steel strand wires；
D, whole loading device balance is adjusted, removes the horizontal support of fixed model stake, adjustment counterpoise is in balance twin beams one
The position at end, until dynamometer reading is consistent with the value of weights, the system of guarantee CYCLIC LOADING system before being initiated is put down
Weighing apparatus；
E, dynamometer line is arranged, itself and data collector are connected；
F, the step of repeating above a-e, the charging assembly in another horizontal vertical direction is installed；
(5) water filling
Water is injected to soil layer superjacent air space, the height of the final water surface is maintained at 10cm；
(6) tested
The cyclic load frequency of motor and the frequency acquisition of data collector are set, dynamometer, foil gauge and displacement transducer are received
Monitor set to data and be sent to data collector, real-time display simultaneously records test data；Setting follows before experiment is reached
Ring load load number, or stake top add up horizontal displacement exceed setting value make pile body occur unstable failure when, off-test, gained
Test data is used for post-processing.
9. according to the method for claim 8, it is characterised in that when Model Pile is pressed into the consolidation soil of specified location, be
The cable inside Model Pile is protected, conical pullover is additionally arranged at the bottom in Model Pile.
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| CN201711109609.2A CN107829451A (en) | 2017-11-11 | 2017-11-11 | Horizontal bidirectional cyclic load loading device and test method based on model casing |
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| CN201711109609.2A CN107829451A (en) | 2017-11-11 | 2017-11-11 | Horizontal bidirectional cyclic load loading device and test method based on model casing |
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| CN108490863A (en) * | 2018-04-02 | 2018-09-04 | 青岛理工大学 | A kind of sea stormy waves dynamic loading test device and method |
| CN109297826A (en) * | 2018-12-10 | 2019-02-01 | 中交第三航务工程局有限公司 | A kind of plate test loading system of tension leg platform (TLP) tendon connector |
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