CN107587531A - Steel tube pile embeded in rock load testing machine and method of testing under a kind of cyclic load - Google Patents
Steel tube pile embeded in rock load testing machine and method of testing under a kind of cyclic load Download PDFInfo
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- CN107587531A CN107587531A CN201710786908.3A CN201710786908A CN107587531A CN 107587531 A CN107587531 A CN 107587531A CN 201710786908 A CN201710786908 A CN 201710786908A CN 107587531 A CN107587531 A CN 107587531A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 38
- 239000010959 steel Substances 0.000 title claims abstract description 38
- 238000012360 testing method Methods 0.000 title claims abstract description 26
- 125000004122 cyclic group Chemical group 0.000 title claims abstract description 20
- 239000011435 rock Substances 0.000 title claims abstract description 17
- 238000010998 test method Methods 0.000 title claims abstract description 7
- 238000006073 displacement reaction Methods 0.000 claims abstract description 92
- 238000010276 construction Methods 0.000 claims abstract description 7
- 238000011068 loading method Methods 0.000 claims description 42
- 239000000203 mixture Substances 0.000 claims description 6
- 230000008859 change Effects 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 238000002474 experimental method Methods 0.000 claims description 3
- 230000008569 process Effects 0.000 claims description 3
- 230000006378 damage Effects 0.000 claims 1
- 238000000465 moulding Methods 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims 1
- 238000013461 design Methods 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 3
- 230000007774 longterm Effects 0.000 description 5
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- 240000002853 Nelumbo nucifera Species 0.000 description 2
- 235000006508 Nelumbo nucifera Nutrition 0.000 description 2
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- 240000007594 Oryza sativa Species 0.000 description 1
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- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
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- 235000009566 rice Nutrition 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
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Abstract
The invention belongs to ground and foundation engineering and field of ocean engineering, it is related to steel tube pile embeded in rock load testing machine and method of testing under a kind of cyclic load, orientation pulley is installed and fixed respectively in rectangle model casing end, pulley is oriented by end steel pipe Model Pile and bloom counterweight are linked together with elongated wire, after steel pipe model pile embedding in rock certain depth, by applying bloom counterweight dummy level cyclic load respectively, and the end horizontal displacement of steel pipe Model Pile after bloom counterweight applies is recorded with laser displacement sensor, so as to obtain different socket lengths, the horizontal bearing character of steel pipe Model Pile under different loads and frequency effect, theoretical foundation is provided for great diameter and long Design of Steel-tube Piles under actual condition；Its is simple in construction, easy to operate, and test data is accurate, and cost is low, environment-friendly.
Description
Technical field：
The invention belongs to ground and foundation engineering and field of ocean engineering, is related to embedding rock under a kind of horizontal loads
Stake loading device designs and method of testing, steel tube pile embeded in rock load testing machine and test under particularly a kind of cyclic load
Method.
Background technology：
In recent years, with the development of the national economy and the fast development of ocean engineering, port engineering and large bridges
Build to off-lying sea, deepwater regions development, over strait, river-spanning bridge and also strided forward towards maximization, complication；Meanwhile with marine oil
Gas and offshore wind farm industry are continually developed using, it is necessary to by more structures construction environment is complicated and changeable, wave tide
Acutely, the marine site of complex geologic conditions, in such cases, related to bearing the large diameter steel pipe pile of horizontal loading and vertical load
Extra large engineering field obtained more and more apply with popularization, this also promotes steel pipe pile foundation towards major diameter, overlength, deep injection
Direction develop.But in normal operation, large diameter steel pipe pile will be born from horizontal lotuses such as high wind load, wave strokes
The long term of load, these low-frequency cyclic loadings will cause the permanent lateral deformation of pile foundation.Meanwhile at science of bridge building and port
The fields such as mouth, harbour, steel pipe pile foundation suffers from the souring of seawater or river, and then produces length to steel pipe pile foundation
The horizontal loading of phase.Great diameter and long steel-pipe pile is heavy pass through during the generation of soil plug effect also make the emphasis of Design of Foundation progressively
The horizontal displacement of effectively control stake, but the major diameter that practical engineering project determines according to specification are transitioned into by vertical bearing capacity control
Design of Steel-tube Piles parameter is often relatively conservative, causes very big waste, and a small number of conditional engineerings are then true by static load test
Determine the parameters such as the bearing capacity of stake, experimentation cost is higher.Moreover, the level on Transmission of Super-Long Large Diameter steel tube pile embeded in rock accumulated at present
Bearingtest and research data are less, and the determination technique study of its socket length is then more weak, rarely seen to go deep into grinding for system
Study carefully data.The determination of socket length is sunk to large diameter steel pipe pile during ocean engineering structure large diameter steel pipe pile foundation construction
Stake character and the especially long-term horizontal bearing characteristic research of long-time bearing characteristic are significant, only accurately judge steel-pipe pile
Relation between socket length and long-term horizontal bearing characteristic, it could preferably improve the long-term level of great diameter and long steel-pipe pile and hold
Character mechanism is carried, the long-term horizontal bearing characteristic research for lifting great diameter and long steel-pipe pile is theoretical.Therefore, there is an urgent need to design one
Steel tube pile embeded in rock loading device and method of testing under kind cyclic load.
The content of the invention：
The shortcomings that it is an object of the invention to overcome prior art to exist, before actual condition is simulated as completely as possible
Put, there is provided the load testing machine and method of testing of steel tube pile embeded in rock horizontal bearing character under a kind of cyclic load,
Rectangle model casing end installs and fixes orientation pulley respectively, and pulley elongated wire is oriented by steel pipe Model Pile by end
Linked together with bloom counterweight, after steel pipe model pile embedding in rock certain depth, by applying bloom counterweight dummy level respectively
Cyclic load, and the end horizontal displacement of steel pipe Model Pile after bloom counterweight applies is recorded with laser displacement sensor, so as to obtain
The horizontal bearing character of steel pipe Model Pile under different socket lengths, different loads and frequency effect, be under actual condition
Great diameter and long Design of Steel-tube Piles provides theoretical foundation.
To achieve these goals, under cyclic load of the present invention steel tube pile embeded in rock load testing machine main body
Structure includes rectangle model casing, model steel-pipe pile, the first orientation pulley, the second orientation pulley, the first elongated wire, second thin
Long steel wire, the first loading counterweight, the second loading counterweight, first laser displacement transducer, second laser displacement transducer, data are adopted
Storage and computer；Model steel-pipe pile is vertically installed at the centre position of rectangle model casing, the left and right two of rectangle model casing
The first orientation pulley and the second orientation pulley are installed with side roof part outer wall respectively, it is fixed that the first elongated wire is arranged on first
To on pulley, one end of the first elongated wire is fixed on model steel-pipe pile, and the other end is applied with the first loading counterweight；Second is thin
Long steel wire is arranged on the second orientation pulley, and one end of the second elongated wire is fixed on model steel-pipe pile, and the other end is applied with
Second loading counterweight, the first loading counterweight and the second loading counterweight are used to apply horizontal whirl-sprayed pile；On rectangle model casing
First laser displacement transducer is installed corresponding to one orientation pulley on inwall, is provided with corresponding to the second orientation pulley on inwall
Second laser displacement transducer, first laser displacement transducer and second laser displacement transducer are used for recording level cyclic load
Act on the horizontal displacement change of drag steel-pipe pile；First laser displacement transducer, second laser displacement transducer, data acquisition
Device and computer composition horizontal displacement data collecting system, first laser displacement transducer and second laser displacement transducer difference
It is connected with data acquisition unit, data acquisition unit is connected with computer.
The socket length of model steel-pipe pile of the present invention is according to maximum socket length and model steel during practice of construction
Pile tube diameter ratio determines that each loading counterweight could apply another after the horizontal displacement of model steel-pipe pile is stable after the completion of applying
Direction counterweight, to ensure the accuracy of test result.
The present invention is to the detailed process of steel tube pile embeded in rock load test under cyclic load：
(1) rectangle model casing is made, and is cleaned up rectangle model casing inside and side wall with brush, prevents bottom
Influence of the residue to result of the test；Graduation mark is drawn along depth inside rectangle model casing, is easily installed the first orientation cunning
Wheel, the second orientation pulley and first laser displacement transducer, second laser displacement transducer, pulley, second are oriented by first
Orientation pulley and first laser displacement transducer, second laser displacement transducer are arranged on 5 lis of distance square model box top
At rice；
(2) model steel-pipe pile is placed on rectangle model casing middle, and it is embedding according to the model steel-pipe pile needed for experiment
Enter depth and pour C30 pea gravel concretens, after concrete strength plays completely, incited somebody to action with the first elongated wire, the second elongated wire
Model steel-pipe pile connects, and the first elongated wire, the second elongated wire pass through the first orientation pulley, the second orientation pulley respectively；
(3) after first laser displacement transducer, second laser displacement transducer being connected with data acquisition unit respectively again with
Computer connects composition horizontal displacement data collecting system, and whether testing level displacement data acquisition system is intact, by the
One loading counterweight is connected with the first elongated wire applies horizontal loading to the left, while records the reading of first laser displacement transducer
Number, the as horizontal displacement of model steel-pipe pile；After the displacement of model steel-pipe pile is stable, the loading counterweight of unloading first, second is added
Carry counterweight and be connected with the second elongated wire and apply horizontal loading to the right, while record the reading of second laser displacement transducer, i.e.,
For the horizontal displacement of model steel-pipe pile；After the displacement of model steel-pipe pile is stable, the loading counterweight of unloading second；
(4) increase first loading counterweight and second loading counterweight weight and repeat step (3), until socket length to break
Untill bad model steel-pipe pile；Change socket length repeat step (2) and (3), obtain model steel pipe under the conditions of different socket lengths
Horizontal loading-displacement curve of stake, and draw optimal socket length.
The present invention compared with prior art, the characteristics of using pulley installation simple, easy to use and flexible is oriented, and is combined and swashed
Optical displacement sensor test frequency is high, tested person environment influences the advantages such as small, stability is good realizes different socket length conditions
The test of lower steel-pipe pile horizontal bearing characteristic, and determine optimal socket length；Its is simple in construction, easy to operate, test data essence
Really, cost is low, environment-friendly.
Brief description of the drawings：
Fig. 1 is the agent structure principle schematic of the present invention.
Fig. 2 is horizontal displacement data collecting system principle schematic diagram of the present invention.
Fig. 3 is displacement measurement datagram during the embodiment of the present invention is further applied load.
Embodiment：
The present invention is described in further detail by way of example and in conjunction with the accompanying drawings.
Embodiment：
The agent structure of steel tube pile embeded in rock load testing machine includes rectangle under cyclic load described in the present embodiment
Model casing 1, model steel-pipe pile 2, first orient pulley 3, second orient pulley 4, the first elongated wire 5, the second elongated wire 6,
First loading counterweight 7, second loads counterweight 8, first laser displacement transducer 9, second laser displacement transducer 10, data acquisition
Device 11 and computer 12；Model steel-pipe pile 2 is vertically installed at the centre position of rectangle model casing 1, a left side for rectangle model casing 1
The first orientation pulley 3 and the second orientation pulley 4 are installed with right both sides top exterior walls respectively, the first elongated wire 5 is installed
On the first orientation pulley 3, one end of the first elongated wire 5 is fixed on model steel-pipe pile 2, and the other end is applied with the first loading
Counterweight 7；Second elongated wire 6 is arranged on the second orientation pulley 4, and one end of the second elongated wire 6 is fixed on model steel-pipe pile 2
On, the other end is applied with the second loading counterweight 8, and the first loading counterweight 7 and second loads counterweight 8 and is used to apply horizontal cyclic lotus
Carry；First laser displacement transducer 9, the second orientation are installed on rectangle model casing 1 corresponding to first orientation pulley 3 on inwall
Second laser displacement transducer 10, first laser displacement transducer 9 and second laser displacement are installed corresponding to pulley 4 on inwall
The horizontal displacement that sensor 10 is used for recording level cyclic load drag steel-pipe pile 2 changes；First laser displacement sensing
Device 9, second laser displacement transducer 10, data acquisition unit 11 and the composition horizontal displacement data collecting system of computer 12, first
Laser displacement sensor 9 and second laser displacement transducer 10 are connected with data acquisition unit 11 respectively, data acquisition unit 11 and meter
Calculation machine 12 connects.
The socket length of model steel-pipe pile 2 described in the present embodiment is according to maximum socket length and model during practice of construction
The diameter ratio of steel-pipe pile 2 determines that each load could apply after the completion of counterweight applies after the horizontal displacement of model steel-pipe pile 2 is stable
Other direction counterweight, to ensure the accuracy of test result.
The present embodiment is to the detailed process of steel tube pile embeded in rock load test under cyclic load：
(1) rectangle model casing 1 is made, and is cleaned up the inside of rectangle model casing 1 and side wall with brush, prevents case
Influence of the bottom residue to result of the test；Graduation mark is drawn along depth inside rectangle model casing 1, is easily installed the first orientation
Pulley 3, second orients pulley 4 and first laser displacement transducer 9, second laser displacement transducer 10, and the first orientation is slided
The orientation pulley 4 of wheel 3, second and first laser displacement transducer 9, second laser displacement transducer 10 are according to being pre-designed position
(the first orientation pulley 3, second orients pulley 4 away from 10 centimetres at the top of model casing；First displacement lasers sensor 9, second laser position
Displacement sensor 10 is away from 5 centimetres at the top of model casing) installed；
(2) model steel-pipe pile 2 is placed on the middle of rectangle model casing 1, and the model steel-pipe pile 2 needed for according to experiment
Insert depth h pours C30 pea gravel concretens, after concrete strength plays completely, with the first elongated wire 5, the second elongate steel
Silk 6 connects model steel-pipe pile 2, and the first elongated wire 5, the second elongated wire 6 are fixed by the first orientation pulley 3, second respectively
To pulley 4；
(3) after first laser displacement transducer 9, second laser displacement transducer 10 being connected with data acquisition unit 11 respectively
Composition horizontal displacement data collecting system is connected with computer 12 again, and whether testing level displacement data acquisition system is complete
It is good, the first loading counterweight 7 is connected with the first elongated wire 5 and applies horizontal loading to the left, while records first laser displacement biography
The horizontal displacement of the reading of sensor 9, as model steel-pipe pile 2；After the displacement of model steel-pipe pile 2 is stable, the loading weight of unloading first
Code 7, the second loading counterweight 8 is connected with the second elongated wire 6 and applies horizontal loading to the right, while record second laser displacement biography
The horizontal displacement of the reading of sensor 10, as model steel-pipe pile 2；After the displacement of model steel-pipe pile 2 is stable, the loading weight of unloading second
Code 8；
(4) weight and repeat step (3) that the first loading counterweight 7 and second loads counterweight 8 are increased, until in socket length
For h when model steel-pipe pile 2 destroy；Change socket length h repeat steps (2) and (3), obtain different socket length condition drags
Horizontal loading-displacement curve of steel-pipe pile 2, and optimal socket length is drawn, as shown in Figure 3.
Claims (3)
1. steel tube pile embeded in rock load testing machine under a kind of cyclic load, it is characterised in that agent structure includes rectangle mould
Molding box, model steel-pipe pile, the first orientation pulley, the second orientation pulley, the first elongated wire, the second elongated wire, the first loading
Counterweight, the second loading counterweight, first laser displacement transducer, second laser displacement transducer, data acquisition unit and computer；Mould
Shaped steel pile tube is vertically installed at the centre position of rectangle model casing, distinguishes in the left and right sides top exterior walls of rectangle model casing
The first orientation pulley and the second orientation pulley are installed with, the first elongated wire is arranged on the first orientation pulley, and first is thin
One end of long steel wire is fixed on model steel-pipe pile, and the other end is applied with the first loading counterweight；Second elongated wire is arranged on the
On two orientation pulleys, one end of the second elongated wire is fixed on model steel-pipe pile, and the other end is applied with the second loading counterweight, the
One loading counterweight and the second loading counterweight are used to apply horizontal whirl-sprayed pile；On rectangle model casing corresponding to the first orientation pulley
First laser displacement transducer is installed on inwall, second laser displacement sensing is installed on inwall corresponding to the second orientation pulley
Device, first laser displacement transducer and second laser displacement transducer are used for recording level cyclic load drag steel-pipe pile
Horizontal displacement change；First laser displacement transducer, second laser displacement transducer, data acquisition unit and computer composition water
Prosposition moves data collecting system, and first laser displacement transducer and second laser displacement transducer connect with data acquisition unit respectively
Connect, data acquisition unit is connected with computer.
2. steel tube pile embeded in rock load testing machine under cyclic load according to claim 1, it is characterised in that the mould
The socket length of shaped steel pile tube determines according to maximum socket length during practice of construction and model steel-pipe pile diameter ratio.
3. one kind uses device as claimed in claim 1 steel tube pile embeded in rock load test method of testing under cyclic load,
It is characterized in that detailed process is：
(1) rectangle model casing is made, and is cleaned up rectangle model casing inside and side wall with brush, prevents bottom from remaining
Influence of the thing to result of the test；Graduation mark is drawn along depth inside rectangle model casing, is easily installed the first orientation pulley,
Two orientation pulleys and first laser displacement transducer, second laser displacement transducer, orient pulley by first, the second orientation is slided
Wheel and first laser displacement transducer, second laser displacement transducer are arranged on the centimeters of distance square model box top 5；
(2) model steel-pipe pile is placed on rectangle model casing middle, and be embedded in deeply according to the model steel-pipe pile needed for experiment
Degree pours C30 pea gravel concretens, after concrete strength plays completely, with the first elongated wire, the second elongated wire by model
Steel-pipe pile connects, and the first elongated wire, the second elongated wire pass through the first orientation pulley, the second orientation pulley respectively；
(3) after first laser displacement transducer, second laser displacement transducer being connected with data acquisition unit respectively again with calculating
Machine connects composition horizontal displacement data collecting system, and whether testing level displacement data acquisition system is intact, and first is added
Carry counterweight and be connected with the first elongated wire and apply horizontal loading to the left, while record the reading of first laser displacement transducer, i.e.,
For the horizontal displacement of model steel-pipe pile；After the displacement of model steel-pipe pile is stable, the loading counterweight of unloading first, counterweight is loaded by second
It is connected with the second elongated wire and applies horizontal loading to the right, while records the reading of second laser displacement transducer, as model
The horizontal displacement of steel-pipe pile；After the displacement of model steel-pipe pile is stable, the loading counterweight of unloading second；
(4) weight and repeat step (3) of the loading counterweight of increasing first and the second loading counterweight, up to socket length to destruction mould
Untill shaped steel pile tube；Change socket length repeat step (2) and (3), obtain model steel-pipe pile under the conditions of different socket lengths
Horizontal loading-displacement curve, and draw optimal socket length.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710786908.3A CN107587531A (en) | 2017-09-04 | 2017-09-04 | Steel tube pile embeded in rock load testing machine and method of testing under a kind of cyclic load |
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| CN201710786908.3A CN107587531A (en) | 2017-09-04 | 2017-09-04 | Steel tube pile embeded in rock load testing machine and method of testing under a kind of cyclic load |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108086369A (en) * | 2018-02-11 | 2018-05-29 | 广东工业大学 | Pile soil common action displacement stress measuring device under a kind of difference socket length |
| CN109724864A (en) * | 2019-01-23 | 2019-05-07 | 中国海洋大学 | It tests the more loads of ocean engineering pile foundation-soil dynamic response and couples loading device |
| CN111648415A (en) * | 2020-05-29 | 2020-09-11 | 河海大学 | Device and method for testing ultra-long-term vibration characteristics of rock-socketed single pile |
| CN114753419A (en) * | 2022-05-27 | 2022-07-15 | 扬州大学 | Test device for simulating load bearing of rock-socketed steel pipe pile foundation in ocean engineering |
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| CN104727354A (en) * | 2015-02-25 | 2015-06-24 | 中国科学院力学研究所 | Testing system simulating ultimate dynamic bearing capacity of cyclic load lower plate anchor |
| CN105002938A (en) * | 2015-07-29 | 2015-10-28 | 浙江大学 | One-dimensional horizontal circulation load loading device and experiment method thereof |
| CN105040755A (en) * | 2015-08-12 | 2015-11-11 | 河海大学 | Socketed pile model testing device based on transparent rock mass and using method of socketed pile model testing device |
| CN107059952A (en) * | 2017-02-28 | 2017-08-18 | 中交武汉港湾工程设计研究院有限公司 | A kind of steel-pipe pile horizontal cyclic experimental provision of simulated waves load |
| CN207144019U (en) * | 2017-09-04 | 2018-03-27 | 中国海洋大学 | Steel tube pile embeded in rock load testing machine under a kind of cyclic load |
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2017
- 2017-09-04 CN CN201710786908.3A patent/CN107587531A/en active Pending
Patent Citations (5)
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| CN104727354A (en) * | 2015-02-25 | 2015-06-24 | 中国科学院力学研究所 | Testing system simulating ultimate dynamic bearing capacity of cyclic load lower plate anchor |
| CN105002938A (en) * | 2015-07-29 | 2015-10-28 | 浙江大学 | One-dimensional horizontal circulation load loading device and experiment method thereof |
| CN105040755A (en) * | 2015-08-12 | 2015-11-11 | 河海大学 | Socketed pile model testing device based on transparent rock mass and using method of socketed pile model testing device |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108086369A (en) * | 2018-02-11 | 2018-05-29 | 广东工业大学 | Pile soil common action displacement stress measuring device under a kind of difference socket length |
| CN108086369B (en) * | 2018-02-11 | 2023-09-12 | 广东工业大学 | Device and method for measuring pile soil combined action displacement stress under different rock-socketed depths |
| CN109724864A (en) * | 2019-01-23 | 2019-05-07 | 中国海洋大学 | It tests the more loads of ocean engineering pile foundation-soil dynamic response and couples loading device |
| CN109724864B (en) * | 2019-01-23 | 2019-11-26 | 中国海洋大学 | It tests the more loads of ocean engineering pile foundation-soil dynamic response and couples loading device |
| CN111648415A (en) * | 2020-05-29 | 2020-09-11 | 河海大学 | Device and method for testing ultra-long-term vibration characteristics of rock-socketed single pile |
| CN111648415B (en) * | 2020-05-29 | 2021-06-08 | 河海大学 | Method for testing vibration characteristics of single rock-socketed pile for ultra-long time |
| CN114753419A (en) * | 2022-05-27 | 2022-07-15 | 扬州大学 | Test device for simulating load bearing of rock-socketed steel pipe pile foundation in ocean engineering |
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