CN105649122A - Model testing device simulating influence of pile side radial stress on pile body axial stress - Google Patents
Model testing device simulating influence of pile side radial stress on pile body axial stress Download PDFInfo
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- CN105649122A CN105649122A CN201610158726.7A CN201610158726A CN105649122A CN 105649122 A CN105649122 A CN 105649122A CN 201610158726 A CN201610158726 A CN 201610158726A CN 105649122 A CN105649122 A CN 105649122A
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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
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- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
- Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)
Abstract
The invention relates to a model testing device simulating influence of pile side radial stress on pile body axial stress. The main structure of the model testing device comprises a model barrel, a soil body, a positioning and guiding ring, a multi-functional model pile, a fiber grating sensor armored optical cable, a silicon piezoresistive soil pressure sensor conduction wire, a silicon piezoresistive pore water pressure sensor shielding water-proof conduction wire, a reaction frame, a microcomputer control electro-hydraulic servo jack, a loading data controller and a sensing signal comprehensive synchronization demodulator. Compared with the prior art, the model testing device has the advantages that the structure is simple; the operation is convenient; measured data is accurate; the simulation testing effect is good; the pile body axial stress, the soil pressure at a pile and soil interface and a pore water pressure are measured simultaneously in a laboratory; and the model testing device is applicable to model testing research considering influence of the radial effective stress on the pile body axial stress and residual stress in a pile sinking process.
Description
Technical field:
The invention belongs to pile foundation engineering technique field, relate to a kind of model test apparatus, particularly a kind of simulate a model test apparatus that pile shaft force is affected by side radial stress.
Background technology:
China is static pressed pile " big country ", and static pressed pile consumption is huge, occupies very big proportion in construction project, in the urgent need to the raising of static pressed pile technology. But, the subject matter that current static pressed pile research and application exist is: do not survey soil pressure and the pore water pressure of a Soil Interface, and the pile driving process of static pressed pile fails to consider the radially effective stress impact on pile body axial stress and residual stress. Therefore, for making up the limitation of experimental test and theoretical research, it is presently required in conjunction with indoor model test, adopt the method for testing of innovation, global test pile sinking and the Internal forces of loading phase that stops, stake Soil Interface soil pressure and pore water pressure, explore mechanism, it is considered to pile shaft force is affected by the effective radial stress in static pressed pile stake side from thin sight, analyze actually constituting and changing of pile shaft force and residual stress, and not yet find the report about this problem at present.
Summary of the invention:
It is an object of the invention to the defect overcoming prior art to exist, seek design provide one can the injection soil body continuously, simulate the model test apparatus that pile shaft force is affected by the effective radial stress in static pressed pile stake side.
To achieve these goals, the agent structure of the present invention includes model bucket, the soil body, positioning and guiding ring, allpurpose model stake, fiber-optic grating sensor armored optical cable, silicon piezoresistance type soil pressure sensor wire, silicon piezoresistance type pore water pressure sensor shielding waterproof wire, reaction frame, microcomputer controlled electro-hydraulic servo jack, loading data controller and transducing signal complex synchronous (FBG) demodulator, model bucket is placed on immediately below reaction frame, the positioning and guiding ring of diameter 75mm is arranged on model bucket top center, one end of positioning and guiding ring is welded with model bucket top outer edge by steel pipe, and other end annulus energy 180 �� is turned to model bucket top center, manually it is divided in soil model bucket and fills compacting, adopt the allpurpose model stake made of the solid pole of POM through positioning and guiding ring to soil body surface, allpurpose model stake top it is placed into bottom microcomputer controlled electro-hydraulic servo jack, microcomputer controlled electro-hydraulic servo jack top is fixed on reaction frame crossbeam, microcomputer controlled electro-hydraulic servo jack is connected with loading data controller, allpurpose model stake inner fiber grating sensor armored optical cable, silicon piezoresistance type soil pressure sensor wire and silicon piezoresistance type pore water pressure sensor shielding waterproof wire are connected with transducing signal complex synchronous (FBG) demodulator.
The diameter of model bucket of the present invention is 800mm, is highly 1200mm, and the Plate Welding of model bucket thickness 2mm forms, and model bucket is close to the position, upper, middle and lower of outer wall and is welded with stirrup.
Transducing signal complex synchronous (FBG) demodulator of the present invention adopts JEME-i15-e32, JEME-i15-e32 to possess the hardware-level synchronous acquisition of the polytype signals such as fiber grating demodulation signal, voltage signal, current signal.
The detailed process that stake side radial stress and pile shaft force are tested by the present invention is:
The first step, model bucket is placed on immediately below reaction frame,
Second step, by one end of positioning and guiding ring by steel-pipe welding to model bucket top outer edge, other end annulus can 180 �� of upsets, be turned to model bucket top center;
3rd step, employing take from the silty clay of same place as the soil body, are put into by the soil body in model bucket and carry out manual zoning and fill compacting;
4th step, after slotting respectively in pile body surface, vertically fiber-optic grating sensor is equidistantly installed in allpurpose model stake respectively, silicon piezoresistance type soil pressure sensor and silicon piezoresistance type pore water pressure sensor, armored optical cable is adopted to connect fiber-optic grating sensor, and 30mm stretches out armored optical cable below allpurpose model stake top, the contact surface of silicon piezoresistance type soil pressure sensor and silicon piezoresistance type pore water pressure sensor all flushes with allpurpose model stake pile body surface, and 30mm stretches out silicon piezoresistance type soil pressure sensor wire and silicon piezoresistance type pore water pressure sensor shielding waterproof wire below allpurpose model stake top, then allpurpose model stake is passed perpendicularly through positioning and guiding ring, stretch into the soil body surface center in model bucket,
5th step, the bottom of microcomputer controlled electro-hydraulic servo jack is placed into allpurpose model stake top, top is fixed on reaction frame crossbeam, and microcomputer controlled electro-hydraulic servo jack is connected with loading data controller, loading data controller controls microcomputer controlled electro-hydraulic servo jack and loads with the penetrating speed of 2.5mm/s;
6th step, the fiber-optic grating sensor armored optical cable that allpurpose model stake top is stretched out, silicon piezoresistance type soil pressure sensor wire and silicon piezoresistance type pore water pressure sensor shielding waterproof wire are connected with transducing signal complex synchronous (FBG) demodulator, realize allpurpose model stake inner fiber grating sensor, the synchronous acquisition of silicon piezoresistance type water pressure sensor and silicon piezoresistance type pore water pressure sensor data, record pile shaft force, the soil pressure of stake Soil Interface and pore water pressure, for simulating the radially effective stress impact on pile body axial stress in pile driving process, Lame (Lame) formula according to Elasticity, consider that the impact of pile body vertical stress can be obtained by stake side radially effective stress, wherein, K is static pressed pile external diameter R0With internal diameter RiRatio:;For pile shaft force;For the radial direction effective stress of stake side,��
The present invention is compared with prior art, its simple in construction, easy to operate, measurement data is accurate, simulation experiment is effective, realize indoor and test pile shaft force, the soil pressure of stake Soil Interface and pore water pressure simultaneously, consider the radially effective stress model investigation on pile body axial stress and the impact of residual stress for pile driving process.
Accompanying drawing illustrates:
Fig. 1 is the agent structure principle schematic of the present invention.
Fig. 2 is the cross section structure principle schematic of allpurpose model stake of the present invention.
Detailed description of the invention:
By the examples below and in conjunction with accompanying drawing the present invention is described in further detail.
Embodiment:
The agent structure of the present embodiment includes model bucket 1, the soil body 2, positioning and guiding ring 3, allpurpose model stake 4, fiber-optic grating sensor armored optical cable 5, silicon piezoresistance type soil pressure sensor wire 6, silicon piezoresistance type pore water pressure sensor shielding waterproof wire 7, reaction frame 8, microcomputer controlled electro-hydraulic servo jack 9, loading data controller 10 and transducing signal complex synchronous (FBG) demodulator 11;Model bucket 1 is placed on immediately below reaction frame 8, the positioning and guiding ring 3 of diameter 75mm is arranged on model bucket 1 top center, one end of positioning and guiding ring 3 is welded with model bucket 1 top outer edge by steel pipe, and other end annulus energy 180 �� is turned to model bucket 1 top center, the soil body 2 is manually divided in model bucket 1 and fills compacting, adopt the allpurpose model stake 4 that the solid pole of POM is made through positioning and guiding ring 3 to the soil body 2 surface, allpurpose model stake 4 top it is placed into bottom microcomputer controlled electro-hydraulic servo jack 9, microcomputer controlled electro-hydraulic servo jack 9 top is fixed on reaction frame 8 crossbeam, microcomputer controlled electro-hydraulic servo jack 9 is connected with loading data controller 10, allpurpose model stake 4 inner fiber grating sensor armored optical cable 5, silicon piezoresistance type soil pressure sensor wire 6 and silicon piezoresistance type pore water pressure sensor shielding waterproof wire 7 are connected with transducing signal complex synchronous (FBG) demodulator 11.
The diameter of model bucket 1 described in the present embodiment is 800mm, is highly 1200mm, and model bucket 1 Plate Welding of thickness 2mm forms, and model bucket 1 is close to the position, upper, middle and lower of outer wall and is welded with stirrup.
Described in the present embodiment, transducing signal complex synchronous (FBG) demodulator 11 adopts JEME-i15-e32, JEME-i15-e32 to possess the hardware-level synchronous acquisition of the polytype signals such as fiber grating demodulation signal, voltage signal, current signal.
The detailed process that stake side radial stress and pile shaft force are tested by the present embodiment is:
The first step, model bucket 1 is placed on immediately below reaction frame 8,
Second step, by one end of positioning and guiding ring by steel-pipe welding to model bucket 1 top outer edge, other end annulus can 180 �� of upsets, be turned to model bucket 1 top center;
3rd step, employing take from the silty clay of same place as the soil body 2, are put into by the soil body 2 in model bucket 1 and carry out manual zoning and fill compacting;
4th step, in allpurpose model stake 4, fiber-optic grating sensor 12 is vertically equidistantly installed after slotting respectively in pile body surface respectively, silicon piezoresistance type soil pressure sensor 13 and silicon piezoresistance type pore water pressure sensor 14, armored optical cable 5 is adopted to connect fiber-optic grating sensor 12, and 30mm stretches out armored optical cable 5 below allpurpose model stake 4 top, the contact surface of silicon piezoresistance type soil pressure sensor and silicon piezoresistance type pore water pressure sensor all flushes with allpurpose model stake 4 pile body surface, and 30mm stretches out silicon piezoresistance type soil pressure sensor wire 6 and silicon piezoresistance type pore water pressure sensor shielding waterproof wire 7 below allpurpose model stake 4 top, then allpurpose model stake 4 is passed perpendicularly through positioning and guiding ring 3, stretch into the soil body 2 centre of surface position in model bucket 1,
5th step, the bottom of microcomputer controlled electro-hydraulic servo jack 9 is placed into allpurpose model stake 4 top, top is fixed on reaction frame 8 crossbeam, and microcomputer controlled electro-hydraulic servo jack 9 is connected with loading data controller 10, loading data controller 10 controls microcomputer controlled electro-hydraulic servo jack 9 and loads with the penetrating speed of 2.5mm/s;
6th step, the fiber-optic grating sensor armored optical cable 5 that allpurpose model stake 4 top is stretched out, silicon piezoresistance type soil pressure sensor wire 6 and silicon piezoresistance type pore water pressure sensor shielding waterproof wire 7 are connected with transducing signal complex synchronous (FBG) demodulator 11, realize allpurpose model stake 4 inner fiber grating sensor, the synchronous acquisition of silicon piezoresistance type water pressure sensor and silicon piezoresistance type pore water pressure sensor data, record pile shaft force, the soil pressure of stake Soil Interface and pore water pressure, for simulating the radially effective stress impact on pile body axial stress in pile driving process, Lame (Lame) formula according to Elasticity, consider that the impact of pile shaft force can be obtained by stake side radially effective stress, wherein, K is static pressed pile external diameter R0With internal diameter RiRatio:;For pile shaft force;For the radial direction effective stress of stake side,��
Claims (1)
1. simulating a model test apparatus that pile shaft force is affected by side radial stress, agent structure includes model bucket, the soil body, positioning and guiding ring, allpurpose model stake, fiber-optic grating sensor armored optical cable, silicon piezoresistance type soil pressure sensor wire, silicon piezoresistance type pore water pressure sensor shielding waterproof wire, reaction frame, microcomputer controlled electro-hydraulic servo jack, loading data controller and transducing signal complex synchronous (FBG) demodulator, model bucket is placed on immediately below reaction frame, the positioning and guiding ring of diameter 75mm is arranged on model bucket top center, one end of positioning and guiding ring is welded with model bucket top outer edge by steel pipe, and other end annulus energy 180 �� is turned to model bucket top center, manually it is divided in soil model bucket and fills compacting, adopt the allpurpose model stake made of the solid pole of POM through positioning and guiding ring to soil body surface, allpurpose model stake top it is placed into bottom microcomputer controlled electro-hydraulic servo jack, microcomputer controlled electro-hydraulic servo jack top is fixed on reaction frame crossbeam, microcomputer controlled electro-hydraulic servo jack is connected with loading data controller, allpurpose model stake inner fiber grating sensor armored optical cable, silicon piezoresistance type soil pressure sensor wire and silicon piezoresistance type pore water pressure sensor shielding waterproof wire are connected with transducing signal complex synchronous (FBG) demodulator,
The diameter of model bucket of the present invention is 800mm, is highly 1200mm, and the Plate Welding of model bucket thickness 2mm forms, and model bucket is close to the position, upper, middle and lower of outer wall and is welded with stirrup;
Transducing signal complex synchronous (FBG) demodulator of the present invention adopts JEME-i15-e32, JEME-i15-e32 to possess the hardware-level synchronous acquisition of the polytype signals such as fiber grating demodulation signal, voltage signal, current signal;
The detailed process that stake side radial stress and pile shaft force are tested by the present invention is:
The first step, model bucket is placed on immediately below reaction frame,
Second step, by one end of positioning and guiding ring by steel-pipe welding to model bucket top outer edge, other end annulus can 180 �� of upsets, be turned to model bucket top center;
3rd step, employing take from the silty clay of same place as the soil body, are put into by the soil body in model bucket and carry out manual zoning and fill compacting;
4th step, after slotting respectively in pile body surface, vertically fiber-optic grating sensor is equidistantly installed in allpurpose model stake respectively, silicon piezoresistance type soil pressure sensor and silicon piezoresistance type pore water pressure sensor, armored optical cable is adopted to connect fiber-optic grating sensor, and 30mm stretches out armored optical cable below allpurpose model stake top, the contact surface of silicon piezoresistance type soil pressure sensor and silicon piezoresistance type pore water pressure sensor all flushes with allpurpose model stake pile body surface, and 30mm stretches out silicon piezoresistance type soil pressure sensor wire and silicon piezoresistance type pore water pressure sensor shielding waterproof wire below allpurpose model stake top, then allpurpose model stake is passed perpendicularly through positioning and guiding ring, stretch into the soil body surface center in model bucket,
5th step, the bottom of microcomputer controlled electro-hydraulic servo jack is placed into allpurpose model stake top, top is fixed on reaction frame crossbeam, and microcomputer controlled electro-hydraulic servo jack is connected with loading data controller, loading data controller controls microcomputer controlled electro-hydraulic servo jack and loads with the penetrating speed of 2.5mm/s;
6th step, the fiber-optic grating sensor armored optical cable that allpurpose model stake top is stretched out, silicon piezoresistance type soil pressure sensor wire and silicon piezoresistance type pore water pressure sensor shielding waterproof wire are connected with transducing signal complex synchronous (FBG) demodulator, realize allpurpose model stake inner fiber grating sensor, the synchronous acquisition of silicon piezoresistance type water pressure sensor and silicon piezoresistance type pore water pressure sensor data, record pile shaft force, the soil pressure of stake Soil Interface and pore water pressure, for simulating the radially effective stress impact on pile body axial stress in pile driving process, Lame (Lame) formula according to Elasticity, consider that the impact of pile body vertical stress can be obtained by stake side radially effective stress, wherein, K is static pressed pile external diameter R0With internal diameter RiRatio:;For pile shaft force;For the radial direction effective stress of stake side,��
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610158726.7A CN105649122B (en) | 2016-03-21 | 2016-03-21 | A kind of model test apparatus simulated stake side radial stress and influenced on pile shaft force |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610158726.7A CN105649122B (en) | 2016-03-21 | 2016-03-21 | A kind of model test apparatus simulated stake side radial stress and influenced on pile shaft force |
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| CN105649122A true CN105649122A (en) | 2016-06-08 |
| CN105649122B CN105649122B (en) | 2018-05-29 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107100210A (en) * | 2017-05-04 | 2017-08-29 | 武汉工程大学 | The pile-soil interaction mechanical behavior test system of controllable ambient stress |
| CN111424737A (en) * | 2020-05-21 | 2020-07-17 | 青岛理工大学 | P-y curve unit body testing device and testing method |
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|---|---|---|---|---|
| KR200385683Y1 (en) * | 2005-03-21 | 2005-06-02 | 김창근 | The test apparatus of static loading for concrete pile |
| CN103512686A (en) * | 2013-10-12 | 2014-01-15 | 青岛理工大学 | Static pressure high-strength prestressed concrete pipe pile body stress testing device |
| CN204510297U (en) * | 2015-03-19 | 2015-07-29 | 中国矿业大学 | Pile soil common action testing arrangement |
| CN105200971A (en) * | 2015-10-22 | 2015-12-30 | 青岛理工大学 | Device and method for testing pile-soil interface soil and pore water pressure |
-
2016
- 2016-03-21 CN CN201610158726.7A patent/CN105649122B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR200385683Y1 (en) * | 2005-03-21 | 2005-06-02 | 김창근 | The test apparatus of static loading for concrete pile |
| CN103512686A (en) * | 2013-10-12 | 2014-01-15 | 青岛理工大学 | Static pressure high-strength prestressed concrete pipe pile body stress testing device |
| CN204510297U (en) * | 2015-03-19 | 2015-07-29 | 中国矿业大学 | Pile soil common action testing arrangement |
| CN105200971A (en) * | 2015-10-22 | 2015-12-30 | 青岛理工大学 | Device and method for testing pile-soil interface soil and pore water pressure |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107100210A (en) * | 2017-05-04 | 2017-08-29 | 武汉工程大学 | The pile-soil interaction mechanical behavior test system of controllable ambient stress |
| CN111424737A (en) * | 2020-05-21 | 2020-07-17 | 青岛理工大学 | P-y curve unit body testing device and testing method |
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| CN105649122B (en) | 2018-05-29 |
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Granted publication date: 20180529 Termination date: 20210321 |