CN102478472A - Test apparatus used for simulating influence of three-axis loading and unloading on engineering pile - Google Patents
Test apparatus used for simulating influence of three-axis loading and unloading on engineering pile Download PDFInfo
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- CN102478472A CN102478472A CN2010105671818A CN201010567181A CN102478472A CN 102478472 A CN102478472 A CN 102478472A CN 2010105671818 A CN2010105671818 A CN 2010105671818A CN 201010567181 A CN201010567181 A CN 201010567181A CN 102478472 A CN102478472 A CN 102478472A
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Abstract
The invention relates to a test apparatus used for simulating the influence of three-axis loading and unloading on an engineering pile, which comprises a pressure chamber upper cover, a pressure chamber, a multistage model pile, a pressure chamber pedestal, a pressure chamber carriage, a pressure chamber pull bar, a pile end constraint spring, a soil sample, a confining pressure loading component, a vertical pressure loading component and a displacement measuring component; the confining pressure loading component comprises a latex film, a sealing ring and a confining pressure loading and unloading valve, the latex film is placed inside the pressure chamber, the upper end and the lower end of the latex film are tightly connected with the pressure chamber through the sealing ring, the confining pressure loading and unloading valve is arranged on the sidewall of the pressure chamber; the vertical pressure loading component comprises an enclosed vertical loading pressure capsule and a pressure capsule valve. Compared with the prior art, the invention has the advantages that three-axis loading and unloading is carried out on the soil sample for determining the influence of compression deformation and rebound deformation of the soil sample on the forced deformability performance of the model pile.
Description
Technical field
The present invention relates to a kind of indoor model stake test unit, especially relate to a kind of three of simulated soil body that are used for and add the test unit of off-load the engineering piles influence.
Background technology
During deep pit digging; Because hole end off-load causes soil body resilience; Hole subsoil body resilience produces friction resistance upwards to engineering piles; Under the combination of suitable stratum and length of reinforcing cage, easily in the steel reinforcement cage bottom plain concrete pile figure tension is concentrated breaks engineering piles because of pulling out on producing, need carry out deep experimental study.
Existing indoor pile foundation model test apparatus loading system is primarily aimed at Model Pile to carry out; To Model Pile apply vertical or level to load; Come the work proterties of test model stake; Model Pile is direct bearing load in this type test, deform and displacement and initiatively in soil, transmit stress, and be to belong to the initiatively indoor model test device of stake category.The influence that pile peripheral earth distortion or motion receive but soil body resilience to engineering piles influence is belongs to the category of passive pile, and a kind of novel test device of needs is studied compression and the resilience of the soil body influence to engineering piles.
Summary of the invention
The object of the invention is exactly to provide a kind of three of simulated soil body that are used for to add the test unit of off-load to the engineering piles influence for the defective that overcomes above-mentioned prior art existence.
The object of the invention can be realized through following technical scheme:
A kind of three of simulated soil body that are used for add the test unit of off-load to the engineering piles influence; It is characterized in that; Comprise pressure chamber's loam cake, pressure chamber, multistage model stake, pressure chamber's base, pressure chamber's carriage, pressure chamber's pull bar, stake end restricted spring, soil sample, confined pressure loading assembly, vertical pressure loading assembly, displacement measurement assembly
Described confined pressure loading assembly comprises that latex film, sealing ring, confined pressure add the off-load valve, and described latex film places the pressure chamber inboard, and two ends closely are connected with the pressure chamber through sealing ring up and down, and described confined pressure adds on the sidewall that the off-load valve is located at the pressure chamber;
Described vertical pressure loading assembly comprises the vertical loading pressure bladder of sealing, pressure bladder valve, and the vertical loading pressure bladder of described sealing is located between pressure chamber's loam cake and the soil sample, and the vertical loading pressure bladder of described pressure bladder valve control sealing adds off-load;
Described displacement measurement assembly comprises a top displacement transducer, soil sample displacement transducer, and described soil sample displacement transducer is located in the pressure chamber and covers;
Described soil sample is filled out in the pressure chamber;
Described pressure chamber carriage is connected with pressure chamber's base; Described pressure chamber base is fixedly connected with pressure chamber's loam cake through pressure chamber's pull bar; Described multistage model stake upper end is provided with pile extension; Described multistage model stake lower end is provided with down pile extension, and described upward pile extension passes the sleeve pipe that covers in the pressure chamber and is connected with a stake top displacement transducer, and described pile extension down is fixed on pressure chamber's base; Described pile extension down is connected with stake end restricted spring one end through RCA, and the described stake end restricted spring other end is fixed on the crossbeam in pressure chamber's carriage.
Described multistage model stake comprises a plurality of single-unit Model Pile and being formed by connecting that described single-unit Model Pile is the pulling force sensor of aluminium alloy, and this pulling force sensor one end is provided with external thread, and the other end is provided with internal thread.
Foil gauge is posted in described pulling force sensor inboard.
Outer ring, described pressure chamber is provided with pressure chamber's fixing collar.
Described pressure chamber base central authorities are provided with permeable stone, and this permeable stone outer ring is provided with the bottom end seal groove, and described permeable stone is provided with drainpipe, and this drainpipe end is provided with draining valve.
The outer wall of described pressure chamber adopts organic glass.
Described sealing ring comprises upper sealing ring, lower sealing ring, and wherein lower sealing ring is located in the bottom end seal groove of pressure chamber's base.
Described pile extension down is fixed on pressure chamber's base through register pin.
Compared with prior art, the present invention has the following advantages:
(1) analysis of experiments can be under different condition, accomplished, the shop experiment good reproducibility can be brought into play, the advantage that research cost is low passive pile.
(2) adopt large-scale triaxial cell, can carry out three through large-scale soil sample and add off-load, accomplish the analysis to the Model Pile ess-strain, having reduced size effect influences error and the uncertainty of bringing to test.
(3) permeable stone is arranged at bright bottom; Permeable stone also can be added in the top, under the situation of removing Model Pile, can be used to accomplish the triaxial consolidation drainage test to large-scale soil sample; Draw the compression-resilience-recompression curve of soil sample, enriched the classical soil mechanics shop experiment of Geotechnical Engineering means.
Description of drawings
Fig. 1 is a structural representation of the present invention;
Fig. 2 is the structural representation of single-unit Model Pile of the present invention;
Fig. 3 is a pressure chamber of the present invention base plane structural representation;
Fig. 4 is the structural representation of the vertical loading pressure bladder of sealing of the present invention.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the present invention is elaborated.
Embodiment
Like Fig. 1; A kind of three of simulated soil body that are used for add the test unit of off-load to the engineering piles influence; Comprise pressure chamber's loam cake 18, pressure chamber 19, multistage model stake 6, pressure chamber's base 22, pressure chamber's carriage 25, pressure chamber's pull bar 4, stake end restricted spring 26, soil sample 8, confined pressure loading assembly, vertical pressure loading assembly, displacement measurement assembly
Described confined pressure loading assembly comprises that latex film 7, sealing ring 10, confined pressure add off-load valve 20; Described latex film 7 places 19 inboards, pressure chamber; Two ends closely are connected with pressure chamber 19 through sealing ring 10 up and down, and described confined pressure adds on the sidewall that off-load valve 20 is located at pressure chamber 19;
Described vertical pressure loading assembly comprises the vertical loading pressure bladder of sealing 3, pressure bladder valve 2, and the vertical loading pressure bladder 3 of described sealing is located between pressure chamber's loam cake 18 and the soil sample 8, and described pressure bladder valve 3 controls are sealed vertical loading pressure bladder 3 and added off-load;
Described displacement measurement assembly comprises a top displacement transducer 15, soil sample displacement transducer 17, and described soil sample displacement transducer 17 is located on pressure chamber's loam cake 18; Described soil sample 8 is filled out in pressure chamber 19;
Described pressure chamber carriage 25 is connected with pressure chamber's base 22; Described pressure chamber base 22 is fixedly connected with pressure chamber's loam cake 18 through pressure chamber's pull bar 4; Described multistage model stake 6 upper ends are provided with pile extension 16; Described multistage model stake 6 lower ends are provided with down pile extension 24, and the sleeve pipe 1 that described upward pile extension 16 passes on pressure chamber's loam cake 18 is connected with a stake top displacement transducer 15, and described pile extension 24 down is fixed on pressure chamber's base 22 through register pin 12; Described pile extension 24 down is connected with stake end restricted spring 26 1 ends through RCA 13, and described stake end restricted spring 26 other ends are fixed on the crossbeam 14 in pressure chamber's carriage 25.19 outer rings, described pressure chamber are provided with pressure chamber's fixing collar 5.
As shown in Figure 2, described multistage model stake 6 comprises a plurality of single-unit Model Pile and being formed by connecting that described single-unit Model Pile is the pulling force sensor of aluminium alloy, and this pulling force sensor one end is provided with external thread 27, and the other end is provided with internal thread 28.Foil gauge 9 is posted in described pulling force sensor inboard.
As shown in Figure 3, base 22 central authorities in described pressure chamber are provided with permeable stone 21, and these permeable stone 21 outer rings are provided with bottom end seal groove 29, and described permeable stone 21 is provided with drainpipe, and this drainpipe end is provided with draining valve 11.
The outer wall of described pressure chamber 19 adopts organic glass.
Described sealing ring 10 comprises upper sealing ring, lower sealing ring, and wherein lower sealing ring is located in the bottom end seal groove 29 of pressure chamber's base.
At first process the demountable pressure chamber that can hold soil sample and Model Pile of a loam cake and base; The size of pressure vessel can be adjusted according to the character of soil sample and the size of Model Pile; Big and need the lateral deformation of restriction soil sample because of confined pressure, pressure chamber's rigidity and anti-lateral deformation ability need bigger.The soil layer ambient stress loads through last earthing pressure and confined pressure and simulates.Model Pile is embedded in the test soil sample; Earlier soil sample is carried out vertical and side direction loading; Measure the pile body ess-strain through the Model Pile foil gauge simultaneously, measure soil sample and pile body change in displacement, finally accomplish the impact analysis of soil sample compression deformation Model Pile through displacement transducer; Again soil sample is carried out the vertical load off-load, obtain pile body ess-strain and the stake soil phase to the displacement situation of change, can realize that soil sample off-load resilience influences the analysis of shape to engineering piles through strain and displacement transducer.Follow the off-load that adds of vertical pressure, when not applying the confined pressure load, can realize experimental analysis under the K0 consolidation condition, when applying different confined pressure, can accomplish three of different confined pressures and add the analysis of experiments process under the off-load condition.
(1) Installation and Debugging: earlier pressure chamber's carriage 25, pressure chamber's base 22 are connected; Cylindrical latex film 7 is placed 19 inboards, pressure chamber; Utilize sealing ring 10 that latex film 7 closely is connected with pressure chamber 19 and be put in the bottom end seal groove 29, wetting permeable stone 21 also is put in the bottom.Through register pin 12 in advance with multistage model stake 6 installation in position; In pressure chamber 19, load soil sample 8 then to predetermined altitude; Sleeve pipe 1 is placed on one's body the pile extension; Install the vertical loading pressure bladder of sealing 3 ready after, through pressure chamber's pull bar 4 pressure chamber's loam cake 18 is connected with pressure chamber's base 22, at last with measurement device installation in position such as stake top displacement transducer 15 and soil sample displacement transducers 17.
(2) launch test: after treating that the device Installation and Debugging are accomplished, can make an experiment.At first soil sample is carried out preconsolidation with reference to geotechnological consolidation test program; Add off-load valve 20 through air compressor via confined pressure again confined pressure is added to designated value, and then progressively soil sample is applied vertical load through pressure bladder valve 2, the influence that the compression deformation of synchronous monitoring soil sample produces the Model Pile ess-strain; After soil sample compression deformation is accomplished; Progressively off-load again makes soil sample produce resilience, and measures the influence of soil sample resilience to the Model Pile parameter.
Claims (8)
1. one kind is used for three of simulated soil body and adds the test unit of off-load to engineering piles influence; It is characterized in that; Comprise pressure chamber's loam cake, pressure chamber, multistage model stake, pressure chamber's base, pressure chamber's carriage, pressure chamber's pull bar, stake end restricted spring, soil sample, confined pressure loading assembly, vertical pressure loading assembly, displacement measurement assembly
Described confined pressure loading assembly comprises that latex film, sealing ring, confined pressure add the off-load valve, and described latex film places the pressure chamber inboard, and two ends closely are connected with the pressure chamber through sealing ring up and down, and described confined pressure adds on the sidewall that the off-load valve is located at the pressure chamber;
Described vertical pressure loading assembly comprises the vertical loading pressure bladder of sealing, pressure bladder valve, and the vertical loading pressure bladder of described sealing is located between pressure chamber's loam cake and the soil sample, and the vertical loading pressure bladder of described pressure bladder valve control sealing adds off-load;
Described displacement measurement assembly comprises a top displacement transducer, soil sample displacement transducer, and described soil sample displacement transducer is located in the pressure chamber and covers;
Described soil sample is filled out in the pressure chamber;
Described pressure chamber carriage is connected with pressure chamber's base; Described pressure chamber base is fixedly connected with pressure chamber's loam cake through pressure chamber's pull bar; Described multistage model stake upper end is provided with pile extension; Described multistage model stake lower end is provided with down pile extension, and described upward pile extension passes the sleeve pipe that covers in the pressure chamber and is connected with a stake top displacement transducer, and described pile extension down is fixed on pressure chamber's base; Described pile extension down is connected with stake end restricted spring one end through RCA, and the described stake end restricted spring other end is fixed on the crossbeam in pressure chamber's carriage.
2. a kind of three of simulated soil body that are used for according to claim 1 add the test unit of off-load to the engineering piles influence; It is characterized in that; Described multistage model stake comprises a plurality of single-unit Model Pile and being formed by connecting; Described single-unit Model Pile is the pulling force sensor of aluminium alloy, and this pulling force sensor one end is provided with external thread, and the other end is provided with internal thread.
3. a kind of three of simulated soil body that are used for according to claim 2 add the test unit of off-load to the engineering piles influence, it is characterized in that foil gauge is posted in described pulling force sensor inboard.
4. a kind of three of simulated soil body that are used for according to claim 1 add the test unit of off-load to the engineering piles influence, it is characterized in that outer ring, described pressure chamber is provided with pressure chamber's fixing collar.
5. a kind of three of simulated soil body that are used for according to claim 1 add the test unit of off-load to the engineering piles influence; It is characterized in that; Described pressure chamber base central authorities are provided with permeable stone; This permeable stone outer ring is provided with the bottom end seal groove, and described permeable stone is provided with drainpipe, and this drainpipe end is provided with draining valve.
6. a kind of three of simulated soil body that are used for according to claim 1 add the test unit of off-load to the engineering piles influence, it is characterized in that the outer wall of described pressure chamber adopts organic glass.
7. a kind of three of simulated soil body that are used for according to claim 1 add the test unit of off-load to the engineering piles influence; It is characterized in that; Described sealing ring comprises upper sealing ring, lower sealing ring, and wherein lower sealing ring is located in the bottom end seal groove of pressure chamber's base.
8. a kind of three of simulated soil body that are used for according to claim 1 add the test unit of off-load to the engineering piles influence, it is characterized in that, described pile extension down is fixed on pressure chamber's base through register pin.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201010567181 CN102478472B (en) | 2010-11-30 | 2010-11-30 | Test apparatus used for simulating influence of three-axis loading and unloading on engineering pile |
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| CN 201010567181 CN102478472B (en) | 2010-11-30 | 2010-11-30 | Test apparatus used for simulating influence of three-axis loading and unloading on engineering pile |
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| CN102478472A true CN102478472A (en) | 2012-05-30 |
| CN102478472B CN102478472B (en) | 2013-05-01 |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103149095A (en) * | 2013-02-05 | 2013-06-12 | 重庆交通大学 | Test method and test device for studying steel-soil contact surface mechanical property |
| CN104007247A (en) * | 2014-05-19 | 2014-08-27 | 西南交通大学 | Testing device and testing method for relation between restraint stress and extrusion deformation of tunnel face |
| CN104165797A (en) * | 2014-08-29 | 2014-11-26 | 上海交通大学 | Pile-soil interface three-axis model testing device under condition of seepage |
| CN104181042A (en) * | 2014-08-29 | 2014-12-03 | 上海交通大学 | Three-axis model tester for testing pressure reduction, percolation, layering and consolidation deformation of soil layer |
| CN104406841A (en) * | 2014-11-26 | 2015-03-11 | 中国人民解放军空军工程大学 | Variable-size true-triaxial multi-functional testing system |
| CN104964881A (en) * | 2015-06-30 | 2015-10-07 | 昆明理工大学 | Triaxial rheological experimental device for measuring mechanical properties of tailings material |
| CN105424913A (en) * | 2015-12-29 | 2016-03-23 | 中国科学院武汉岩土力学研究所 | Test apparatus for simulating soil plugging effect generated in pile sinking process of open tube pile |
| CN105424487A (en) * | 2016-01-11 | 2016-03-23 | 中国科学院武汉岩土力学研究所 | Testing device for simulating static pressure pile-sinking process of steel pipe pile under confining pressure condition and method of testing device |
| CN105547841A (en) * | 2015-12-11 | 2016-05-04 | 中国科学院武汉岩土力学研究所 | Confining pressure-controllable testing apparatus and testing method for lateral friction of rock |
| CN105571946A (en) * | 2016-02-02 | 2016-05-11 | 燕山大学 | Membrane structure for measuring strain and deformation of upper-hard-lower-soft type soil sample |
| CN109752252A (en) * | 2019-01-22 | 2019-05-14 | 北京交通大学 | A kind of device of triaxial apparatus high confining pressure pressure chamber sealing |
| CN113237761A (en) * | 2021-06-29 | 2021-08-10 | 辽宁工程技术大学 | Test device and method for testing bonding performance of reinforcing steel bar and confined concrete |
| CN113529681A (en) * | 2021-06-04 | 2021-10-22 | 吉林建筑大学 | Roadbed dynamic triaxial resilience modulus tester |
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Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103149095A (en) * | 2013-02-05 | 2013-06-12 | 重庆交通大学 | Test method and test device for studying steel-soil contact surface mechanical property |
| CN104007247A (en) * | 2014-05-19 | 2014-08-27 | 西南交通大学 | Testing device and testing method for relation between restraint stress and extrusion deformation of tunnel face |
| CN104007247B (en) * | 2014-05-19 | 2016-03-02 | 西南交通大学 | Tunnel tunnel face confining pressure and extrusion deformation relation test unit and test method |
| CN104165797A (en) * | 2014-08-29 | 2014-11-26 | 上海交通大学 | Pile-soil interface three-axis model testing device under condition of seepage |
| CN104181042A (en) * | 2014-08-29 | 2014-12-03 | 上海交通大学 | Three-axis model tester for testing pressure reduction, percolation, layering and consolidation deformation of soil layer |
| CN104406841A (en) * | 2014-11-26 | 2015-03-11 | 中国人民解放军空军工程大学 | Variable-size true-triaxial multi-functional testing system |
| CN104964881A (en) * | 2015-06-30 | 2015-10-07 | 昆明理工大学 | Triaxial rheological experimental device for measuring mechanical properties of tailings material |
| CN105547841A (en) * | 2015-12-11 | 2016-05-04 | 中国科学院武汉岩土力学研究所 | Confining pressure-controllable testing apparatus and testing method for lateral friction of rock |
| CN105547841B (en) * | 2015-12-11 | 2018-03-20 | 中国科学院武汉岩土力学研究所 | Confined pressure controllable rock side friction test device and its method |
| CN105424913B (en) * | 2015-12-29 | 2017-04-19 | 中国科学院武汉岩土力学研究所 | Test apparatus for simulating soil plugging effect generated in pile sinking process of open tube pile |
| CN105424913A (en) * | 2015-12-29 | 2016-03-23 | 中国科学院武汉岩土力学研究所 | Test apparatus for simulating soil plugging effect generated in pile sinking process of open tube pile |
| CN105424487A (en) * | 2016-01-11 | 2016-03-23 | 中国科学院武汉岩土力学研究所 | Testing device for simulating static pressure pile-sinking process of steel pipe pile under confining pressure condition and method of testing device |
| CN105424487B (en) * | 2016-01-11 | 2017-12-05 | 中国科学院武汉岩土力学研究所 | The experimental rig and its method of static pressure steel-pipe pile pile driving process under the conditions of simulation confined pressure |
| CN105571946B (en) * | 2016-02-02 | 2018-02-09 | 燕山大学 | The membrane structure of the firmly lower strain of soft-type soil sample and deformation in a kind of test |
| CN105571946A (en) * | 2016-02-02 | 2016-05-11 | 燕山大学 | Membrane structure for measuring strain and deformation of upper-hard-lower-soft type soil sample |
| CN109752252A (en) * | 2019-01-22 | 2019-05-14 | 北京交通大学 | A kind of device of triaxial apparatus high confining pressure pressure chamber sealing |
| CN113529681A (en) * | 2021-06-04 | 2021-10-22 | 吉林建筑大学 | Roadbed dynamic triaxial resilience modulus tester |
| CN113237761A (en) * | 2021-06-29 | 2021-08-10 | 辽宁工程技术大学 | Test device and method for testing bonding performance of reinforcing steel bar and confined concrete |
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