CN102478472B - 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 PDF

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Publication number
CN102478472B
CN102478472B CN 201010567181 CN201010567181A CN102478472B CN 102478472 B CN102478472 B CN 102478472B CN 201010567181 CN201010567181 CN 201010567181 CN 201010567181 A CN201010567181 A CN 201010567181A CN 102478472 B CN102478472 B CN 102478472B
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CN
China
Prior art keywords
pressure chamber
pressure
pile
load
stake
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CN 201010567181
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Chinese (zh)
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CN102478472A (en
Inventor
楼晓明
李德宁
杨晶
黄江枫
吴昊
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同济大学
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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

Be used for the simulation soil body three axles and add off-load to the test unit of engineering pile impact
Technical field
The present invention relates to a kind of indoor model stake test unit, especially relate to and a kind ofly add off-load to the test unit of engineering pile impact for the simulation soil body three axles.
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 pile, under suitable stratum combination and length of reinforcing cage, easily tension is concentrated breaks engineering pile because generation is pulled out at steel reinforcement cage bottom plain concrete pile figure, need carry out deep experimental study.
Existing indoor pile foundation model test apparatus loading system carries out mainly for Model Pile, to Model Pile apply vertical or level to load, come the working property of test model stake, Model Pile is direct bearing load in this class test, deforming and displacement and initiatively transmit stress in soil, is to belong to the initiatively indoor model test device of stake category.But soil body resilience is because the impact that pile peripheral earth distortion or motion are subject on engineering pile impact, belongs to the category of passive pile, and a kind of novel test device of needs is studied the compression of the soil body and resilience to the impact of engineering pile.
Summary of the invention
Purpose of the present invention is exactly to provide a kind of for the defective that overcomes above-mentioned prior art existence to add off-load to the test unit of engineering pile impact for the simulation soil body three axles.
Purpose of the present invention can be achieved through the following technical solutions:
A kind ofly add off-load to the test unit of engineering pile impact for the simulation soil body three axles, 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 by 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 by 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 lower pile extension, described upper pile extension passes the sleeve pipe that covers in the pressure chamber and is connected with stake top displacement transducer, described lower pile extension is fixed on pressure chamber's base, described lower pile extension is connected by signal line and stake end restricted spring one end, and described stake holds the restricted spring other end to be fixed on the crossbeam in pressure chamber's carriage.
Described multistage model stake comprises by a plurality of single-unit Model Pile and being formed by connecting, and 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 drainage pipe 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 lower pile extension is fixed on pressure chamber's base by register pin.
Compared with prior art, the present invention has the following advantages:
(1) analysis of experiments to passive pile can be under different condition, finished, the shop experiment good reproducibility can be brought into play, the advantage that research cost is low.
(2) adopt large-scale triaxial cell, can carry out three axles by large-scale soil sample and add off-load, finish the analysis to the Model Pile ess-strain, having reduced size effect affects 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, in the situation that the remove model stake can be used to finish the triaxial consolidation drainage test for large-scale soil sample, the classical soil mechanics shop experiment of Geotechnical Engineering means have been enriched in the compression-resilience of drafting soil sample-recompression curve.
Description of drawings
Fig. 1 is structural representation of the present invention;
Fig. 2 is the structural representation of single-unit Model Pile of the present invention;
Fig. 3 is 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
The present invention is described in detail below in conjunction with the drawings and specific embodiments.
Embodiment
Such as Fig. 1, a kind ofly add off-load to the test unit of engineering pile impact for the simulation soil body three axles, 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 by 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 3 of sealing, 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 the vertical loading pressure bladder 3 of described pressure bladder valve 3 control sealings adds 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 by 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 lower pile extension 24, the sleeve pipe 1 that described upper pile extension 16 passes on pressure chamber's loam cake 18 is connected with stake top displacement transducer 15, described lower pile extension 24 is fixed on pressure chamber's base 22 by register pin 12, described lower pile extension 24 is connected with stake end restricted spring 26 1 ends by signal line 13, holds restricted spring 26 other ends to be fixed on the crossbeam 14 in pressure chamber's carriage 25 for described.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 by a plurality of single-unit Model Pile and being formed by connecting, and 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 drainage pipe 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, large and need the lateral deformation of restriction soil sample because of confined pressure, pressure chamber's rigidity and anti-lateral deformation capacity need larger.The soil layer ambient stress loads to simulate by cladding earth pressure and confined pressure.Model Pile is embedded in the test soil sample, first soil sample is carried out vertical and side direction loading, measure the pile body ess-strain by the Model Pile foil gauge simultaneously, measure soil sample and pile body change in displacement by displacement transducer, finally finish soil sample compression deformation to the impact analysis of Model Pile; Again soil sample is carried out the vertical load off-load, obtain pile body ess-strain and the native relative displacement situation of change of stake by strain and displacement transducer, can realize that soil sample off-load resilience affects the analysis of shape on engineering pile.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 finish different confined pressure three axles and add analysis of experiments process under the Excavation.
(1) Installation and Debugging: first 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.By register pin 12 in advance with multistage model stake 6 installation in position, then to the pressure chamber 19 interior filling soil samples 8 to predetermined altitude, sleeve pipe 1 is placed in it the upper pile extension, install the vertical loading pressure bladder of sealing 3 ready after, by pressure chamber's pull bar 4 pressure chamber's loam cake 18 is connected with pressure chamber's base 22, at last stake top displacement transducer 15 and soil sample displacement transducer 17 etc. is measured the device installation in position.
(2) launch test: after the device Installation and Debugging are finished, can test.At first with reference to geotechnological consolidation test program soil sample is carried out preconsolidation, add off-load valve 20 by air compressor via confined pressure again confined pressure is added to designated value, and then progressively soil sample is applied vertical load by pressure bladder valve 2, the impact that the compression deformation of Simultaneous Monitoring soil sample produces the Model Pile ess-strain, after soil sample compression deformation is finished, again progressively off-load makes soil sample produce resilience, and measures the soil sample resilience to the Model Pile effect of parameters.

Claims (8)

1. one kind is used for the simulation soil body three axles and adds off-load to the test unit of engineering pile impact, 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 by 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 by 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 lower pile extension, described upper pile extension passes the sleeve pipe that covers in the pressure chamber and is connected with stake top displacement transducer, described lower pile extension is fixed on pressure chamber's base, described lower pile extension is connected by signal line and stake end restricted spring one end, and described stake holds the restricted spring other end to be fixed on the crossbeam in pressure chamber's carriage.
2. according to claim 1ly a kind ofly add off-load to the test unit of engineering pile impact for the simulation soil body three axles, it is characterized in that, described multistage model stake is formed by connecting by a plurality of single-unit Model Pile, described single-unit Model Pile is the pulling force sensor of aluminium alloy, this pulling force sensor one end is provided with external thread, and the other end is provided with internal thread.
3. according to claim 2ly a kind ofly add off-load to the test unit of engineering pile impact for the simulation soil body three axles, it is characterized in that, foil gauge is posted in described pulling force sensor inboard.
4. according to claim 1ly a kind ofly add off-load to the test unit of engineering pile impact for the simulation soil body three axles, it is characterized in that, outer ring, described pressure chamber is provided with pressure chamber's fixing collar.
5. according to claim 1ly a kind ofly add off-load to the test unit of engineering pile impact for the simulation soil body three axles, 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, described permeable stone is provided with drainpipe, and this drainage pipe end is provided with draining valve.
6. according to claim 1ly a kind ofly add off-load to the test unit of engineering pile impact for the simulation soil body three axles, it is characterized in that, the outer wall of described pressure chamber adopts organic glass.
7. according to claim 1ly a kind ofly add off-load to the test unit of engineering pile impact for the simulation soil body three axles, 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. according to claim 1ly a kind ofly add off-load to the test unit of engineering pile impact for the simulation soil body three axles, it is characterized in that, described lower pile extension is fixed on pressure chamber's base by register pin.
CN 201010567181 2010-11-30 2010-11-30 Test apparatus used for simulating influence of three-axis loading and unloading on engineering pile CN102478472B (en)

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CN103149095B (en) * 2013-02-05 2014-12-24 重庆交通大学 Test method and test device for studying steel-soil contact surface mechanical property
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
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
CN104165797B (en) * 2014-08-29 2017-11-14 上海交通大学 The shaft model testing equipment of pile-soil interface three under the conditions of seepage flow
CN104406841B (en) * 2014-11-26 2016-11-23 中国人民解放军空军工程大学 A kind of change size true triaxial multifunction test system
CN104964881B (en) * 2015-06-30 2017-08-25 昆明理工大学 A kind of triaxial rheology experimental provision for measuring tailings material mechanical property
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
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