CN104294860A - P-Y curve measuring device in pile-soil interaction shaking table test - Google Patents

P-Y curve measuring device in pile-soil interaction shaking table test Download PDF

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Publication number
CN104294860A
CN104294860A CN201410502156.XA CN201410502156A CN104294860A CN 104294860 A CN104294860 A CN 104294860A CN 201410502156 A CN201410502156 A CN 201410502156A CN 104294860 A CN104294860 A CN 104294860A
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China
Prior art keywords
pvc pipe
pile body
soil
pile
plain bar
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CN201410502156.XA
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CN104294860B (en
Inventor
庄一舟
陈云
王胜智
陈斌
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Fuzhou University
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Fuzhou University
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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D33/00Testing foundations or foundation structures

Abstract

The invention relates to a P-Y curve measuring device in the pile-soil interaction shaking table test. The P-Y curve measuring device comprises a bearing pile body embedded into a test soil body in a model box. The model box is arranged on a shaking table. All test sections of the bearing pile body are connected with plain round steel bars perpendicular to the axis of the bearing pile body. Soil pressure meters are arranged on the connecting portions of the bearing pile body and the plain round steel bars. The other ends of the plain round steel bars penetrate through the side walls of the model box and then are connected with glass pieces with the smooth surfaces in a perpendicular mode. Acceleration meters are arranged in the test soil body beside the bearing pile body in a corresponding mode, arranged on the same height position as the plain round steel bars and used for measuring the accelerated speed of the test soil body. A fixing support parallel to the bearing pile body is arranged beside the model box and provided with a plurality of laser displacement meters, wherein emergence laser of the laser displacement meters is perpendicular to the corresponding glass pieces to measure the displacement of the bearing pile body.

Description

P-Y curve measurement mechanism in pile-soil interaction shaketalle test
Technical field
The present invention relates to P-Y curve measurement mechanism in a kind of pile-soil interaction shaketalle test, belong to pile-soil interaction field.
Background technology
Pile foundation is that one has long history, uses base form widely.In the architecture basics construction such as highrise building, offshore platform and bridge, people often use pile foundation.Therefore the research of nonlinear pile-soil interaction is more and more subject to people's attention.People are studied soil-pile dynamic interaction by three kinds of modes.The first, based on the research of on-the-spot prototype test.On-the-spot prototype test is reliable, but high cost, has region to limit, and the horizontal force such as earthquake has certain contingency; The second, based on the research of finite element modelling.Finite element modelling is reproducible, and condition is easy to control, but the simulation of this structure condition of soil and stake soil contact interface is a difficult problem always; The third, based on the research of indoor shaketalle test.Indoor shaketalle test cost is lower, comparatively identical with actual conditions, can study the impact of Different factor, reduces the restriction of time, human and material resources and financial resources, can as the good means of analysis and research.
The pile-soil interaction theory of horizontal bearing stake has the multiple theory of computation.Wherein the representational theory of most is P-Y curve method.This method has considered the character such as non-linear, outer lotus effect and pile body deformation of soil around pile, becomes the important method of the pile-soil interaction of calculated level bearing peg.
Conventional power P-Y curved measurement technology obtains bending by measuring pile strain, then obtains soil pressure against piles P and pile body amount of deflection Y by bending, finally draws power P-Y curve map.Solve soil pressure P and pile body amount of deflection Y has diverse ways.Direct differential method.3 difference formulas are adopted directly to calculate to adjacent actual measurement moment.Because the spacing of measuring point is comparatively large, adjacent measuring point moment also differs comparatively large, causes resultant error very large.Calculus of finite differences after smooth treatment.First smooth treatment is carried out to actual measurement moment of flexure, and then adopt calculus of finite differences according to its result.Although this kind of way substantially increases precision than last method, error is still bigger than normal.Polynomial interpolation.Polynomial interpolation adopts the actual measurement moment of flexure of least square method to pile body discrete point to carry out fitting of a polynomial, and then solve.It is generally acknowledged that employing 5 times could better matching result of the test to 7 order polynomials.
But, these methods cannot consider the impact of the actual conditions such as pile body bending rigidity, stake cross sectional shape, stake top restrained boundary condition, theoretical foundation is not strong, and experimental data obtains P-Y curve by anomalous integral differentiate, pile body amount of deflection Y and soil pressure P has larger sensitiveness to surveyed data, there is higher required precision to experimental data, calculate result and be difficult to realistic.
Summary of the invention
The object of the invention is, for above weak point, to provide one p-Y curve measurement mechanism in pile-soil interaction shaketalle test.
The scheme that technical solution problem of the present invention adopts is, P-Y curve measurement mechanism in a kind of pile-soil interaction shaketalle test, comprise the carrying pile body in the test soil body be embedded in model casing, described model casing is arranged on a vibration table, the each testing section place of described carrying pile body is connected with the plain bar perpendicular to its axis, the junction of described carrying pile body and plain bar is provided with earth pressure gauge, the sheet glass of surfacing is vertically connected with after described plain bar other end penetration model case sidewall, correspondingly in the test soil body of described bearing peg side to be by the side of provided with plain bar sustained height to measure the accelerometer testing soil body acceleration, described model casing side is provided with and the fixed mount carrying pile body and parallel, described fixed mount is provided with several shoot lasers perpendicular to measure the laser displacement gauge carrying pile body displacement with corresponding sheet glass.
Further, described plain bar overcoat has pvc pipe assembly.
Further, described pvc pipe assembly comprises the pvc pipe A being set in plain bar, and pile body is vertical is connected for described pvc pipe A one end and carrying, and the other end and pvc pipe B one end are slidably socketed, described pvc pipe B other end penetration model case sidewall.
Further, described pvc pipe A external diameter is slightly less than pvc pipe B internal diameter, and described pvc pipe A is set in pvc pipe B tube wall, and described pvc pipe A and pvc pipe B connecting portion are coated with the butter sliding agent in order to lubricate.
Further, described laser displacement gauge, accelerometer, plain bar and carrying pile body testing section are positioned at same level.
Compared with prior art, the present invention has following beneficial effect: be placed on pvc pipe in plain bar and be connected with the displacement meter in same level, farthest can get rid of the interference of the soil body to measurement result.Lubricate with butter sliding agent between larger pvc pipe and less pvc pipe simultaneously, eliminate the impact on pile body displacement.Plain bar is connected with the sheet glass of displacement meter by surfacing, is convenient to measure.The stake side displacement that technology obtains thus can consider the impact of the factor such as pile body bending rigidity moment of flexure, stake cross sectional shape, stake top restrained boundary condition, avoids the difficulty of border value, more close to actual conditions.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, patent of the present invention is further illustrated.
Fig. 1 is the structural representation of this device;
Fig. 2 is the P-Y curve map recorded of this device.
In figure: 1-tests the soil body; 2-carries pile body; 3-pvc pipe A; 4-butter sliding agent; 5-plain bar; 6-pvc pipe B; 7-sheet glass; 8-laser displacement gauge; 9-earth pressure gauge; 10-fixed mount; 11-vibroplatform; 12-accelerometer.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is further described.
As shown in Figure 1, P-Y curve measurement mechanism in a kind of pile-soil interaction shaketalle test, comprise the carrying pile body 2 in the test soil body 1 be embedded in model casing, described model casing is arranged on vibroplatform 11, the each testing section place of described carrying pile body 2 is connected with the plain bar 5 perpendicular to its axis, described carrying pile body 2 is provided with earth pressure gauge 9 with the junction of plain bar 5, the sheet glass 7 of surfacing is vertically connected with after described plain bar 5 other end penetration model case sidewall, in the test soil body 1 of described carrying pile body 2 side, correspondence is provided with plain bar 5 sustained height to measure the accelerometer 12 testing the soil body 1 acceleration, described model casing side is provided with and the fixed mount 10 carrying pile body 2 and parallel, described fixed mount 10 is provided with several shoot lasers perpendicular to measure the laser displacement gauge 8 carrying pile body 2 displacement with corresponding sheet glass 7.
In the present embodiment, certainty of measurement first with sander polishing, thus should be improved in described carrying pile body 2 cross section, earth pressure gauge 9 surface and plain bar 5 termination.
In the present embodiment, in order to prevent soil body motion artifacts displacement measurement, described plain bar 5 overcoat has pvc pipe assembly.
In the present embodiment, described pvc pipe assembly comprises the pvc pipe A3 being set in plain bar 5, and pile body 2 is vertical is connected for described pvc pipe A3 one end and carrying, and the other end and pvc pipe B6 one end are slidably socketed, described pvc pipe B6 other end penetration model case sidewall.
In the present embodiment, described pvc pipe A3 external diameter is slightly less than pvc pipe B6 internal diameter, and described pvc pipe A3 is set in pvc pipe B6 tube wall, and described pvc pipe A3 and pvc pipe B6 connecting portion are coated with the butter sliding agent 4 in order to lubricate.
In the present embodiment, in order to obtain test data accurately, described laser displacement gauge 8, accelerometer 12, plain bar 5 and carrying pile body 2 testing section are positioned at same level.
Specific implementation process:
(1) according to test requirements document, distance between Confirming model case and carrying pile body 2, the length of plain bar 5 and pvc pipe group is obtained according to the distance between model casing and carrying pile body 2, the length of plain bar 5 and pvc pipe group should be a bit larger tham the distance 5 ~ 10cm between model casing and carrying pile body 2, plain bar 5 should 2-3cm slightly longer than pvc pipe group, and diameter is about 10mm;
(2) according to test requirements document, determine the diameter of stake, according to the diameter of the diameter determination pvc pipe A3 of stake, be generally greater than a diameter 1/4, be less than a diameter 1/2, pvc pipe A3 diameter should 1 ~ 2cm less of pvc pipe B6 diameter, and length is about 20cm;
(3) with sander, carrying pile body 2 test point cross section, earth pressure gauge 9 surface and lateral light round bar 5 termination are polished flat;
(4) with glass cement by lateral light round bar 5 termination and earth pressure gauge 9 with carrying pile body 2 affixed, with less pvc pipe A outer wall coating butter sliding agent, two pipes are connected at pvc pipe B inwall, are finally coated at plain bar and with to carry pile body 2 affixed;
(5) until pvc pipe and plain bar and carrying pile body 2 affixed completely after, at plain bar 5 outer end adhering glass sheet 7, set up fixed mount 10 at model casing side simultaneously, place the displacement that laser displacement gauge 8 measures this some place at sustained height place;
(6) to the filling test soil body 1 in model casing;
(7) displacement of Test Data Collecting method measuring vibrations platform 11 table top is carried out;
(8) at At The Height identical with plain bar 5, arrange accelerometer 12, accelerometer 12 position is greater than 6 times of stake footpaths from the distance of carrying pile body 2;
(9) program of the dynamic displacement response calculating soil is write with Matlab;
(10) the displacement time-histories of the displacement time-histories of the table top surveyed, carrying pile body 2 and the displacement time-histories of the test soil body 1, the displacement of stake soil is relatively calculated;
(11) displacement of the soil pressure recorded and the stake that calculates soil relatively obtains P-Y curve, as shown in Figure 2.
Above-listed preferred embodiment; the object, technical solutions and advantages of the present invention are further described; be understood that; the foregoing is only preferred embodiment of the present invention; not in order to limit the present invention; within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (5)

1. P-Y curve measurement mechanism in a pile-soil interaction shaketalle test, comprise the carrying pile body in the test soil body be embedded in model casing, it is characterized in that: described model casing is arranged on a vibration table, the each testing section place of described carrying pile body is connected with the plain bar perpendicular to its axis, the junction of described carrying pile body and plain bar is provided with earth pressure gauge, the sheet glass of surfacing is vertically connected with after described plain bar other end penetration model case sidewall, correspondingly in the test soil body of described bearing peg side to be by the side of provided with plain bar sustained height to measure the accelerometer testing soil body acceleration, described model casing side is provided with and the fixed mount carrying pile body and parallel, described fixed mount is provided with several shoot lasers perpendicular to measure the laser displacement gauge carrying pile body displacement with corresponding sheet glass.
2. in pile-soil interaction shaketalle test according to claim 1, P-Y curve measurement mechanism is characterized in that: described plain bar overcoat has pvc pipe assembly.
3. P-Y curve measurement mechanism in pile-soil interaction shaketalle test according to claim 2, it is characterized in that: described pvc pipe assembly comprises the pvc pipe A being set in plain bar, pile body is vertical is connected for described pvc pipe A one end and carrying, the other end and pvc pipe B one end are slidably socketed, described pvc pipe B other end penetration model case sidewall.
4. P-Y curve measurement mechanism in pile-soil interaction shaketalle test according to claim 3, it is characterized in that: described pvc pipe A external diameter is slightly less than pvc pipe B internal diameter, described pvc pipe A is set in pvc pipe B tube wall, and described pvc pipe A and pvc pipe B connecting portion are coated with the butter sliding agent in order to lubricate.
5. P-Y curve measurement mechanism in pile-soil interaction shaketalle test according to claim 1, is characterized in that: described laser displacement gauge, accelerometer, plain bar and carrying pile body testing section are positioned at same level.
CN201410502156.XA 2014-09-26 2014-09-26 P-Y curve measurement mechanism in pile-soil interaction shaketalle test Expired - Fee Related CN104294860B (en)

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Cited By (2)

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Publication number Priority date Publication date Assignee Title
CN106897554A (en) * 2017-02-22 2017-06-27 龙源(北京)风电工程设计咨询有限公司 A kind of automation computational methods that P Y profiles are carried out based on MATLAB
CN108982264A (en) * 2018-07-16 2018-12-11 浙江大学 A kind of p-y curve measurement mechanism based on the development of soil body shear band

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Publication number Priority date Publication date Assignee Title
CN106592655B (en) * 2016-12-30 2018-10-02 太原理工大学 Pile pile pile sinking simulation test device and method under a kind of gradient confining pressure

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CN103882894A (en) * 2014-04-10 2014-06-25 山东电力工程咨询院有限公司 Prestressed concrete pipe pile horizontal bearing characteristic test model and test method
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CN103835324A (en) * 2014-04-01 2014-06-04 兰州理工大学 Seismic response control test device of frame anchor rod slope anchoring structure and construction method
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106897554A (en) * 2017-02-22 2017-06-27 龙源(北京)风电工程设计咨询有限公司 A kind of automation computational methods that P Y profiles are carried out based on MATLAB
CN108982264A (en) * 2018-07-16 2018-12-11 浙江大学 A kind of p-y curve measurement mechanism based on the development of soil body shear band
CN108982264B (en) * 2018-07-16 2020-08-04 浙江大学 P-y curve measuring device based on soil body shear band development

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