CN104132802A - Vertical large-stroke loading device and test method for centrifugation model test - Google Patents
Vertical large-stroke loading device and test method for centrifugation model test Download PDFInfo
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- CN104132802A CN104132802A CN201410292489.4A CN201410292489A CN104132802A CN 104132802 A CN104132802 A CN 104132802A CN 201410292489 A CN201410292489 A CN 201410292489A CN 104132802 A CN104132802 A CN 104132802A
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Abstract
Disclosed is a vertical large-stroke loading device for a centrifugation model test. The device includes a model box, a stepping motor, a gear, a worm gear and a load sensor. The stepping motor, the gear and the worm gear are arranged on the upper surface of a top cover of the model box. The stepping motor is arranged horizontally. A turbine shaft adopts a ball screw which vertically passes through the top cover of the model box. The load sensor is arranged below the top cover of the model box and at the lower end of the turbine shaft. A rotating shaft of the stepping motor is connected to the worm gear after the speed is reduced by the gear. The vertical large-stroke loading device is capable of carrying out large-stroke vertical loading and applying a large-amplitude vertical pull pressure; through adoption of strain-type control, a side-direction load can be applied continuously and stably and the loading rate is adjustable; a vertical load-displacement curve can be measured while loading is carried out; and arrangement of a soil engineering centrifugation model is facilitated. The device and test method are significantly safe in operation and capable of realizing accurate control.
Description
Technical field
The present invention relates to a kind of servicing unit being applied on geotechnical centrifuge, be specifically related to a kind of device that can be used for carrying out vertical large stroke loading operating mode centrifugal model test, be specially adapted to simulate vertical length apart from motion process in centrifugal model test, as the sinking construction of being pressed into or extracting of pile foundation, static sounding test, the construction of deep-sea ocean platform suction anchor, case tubular or bucket formula basis seawall, cone penetration test, standard penetration test (SPT) etc.
Background technology
In Geotechnical Engineering, having construction or the test of a lot of works is mainly vertical long distance motion, vertically squeeze into, be pressed into and extract, representative is exactly various pile foundations the most significantly, also be useful in addition the suction type anchoring pile [Zhang Jianhong of deep-sea ocean platform, the little quiet deep-sea offshore platform foundation brief introduction of woods [J], Geotechnical Engineering circle, 2004, 7 (12): 19-22], tension leg platform (TLP) basis [Zhang Jianhong, Lin little Jing, physical simulation [J] the Geotechnical Engineering journal of tension leg platform (TLP) suction type foundation under soldier's horizontal loads dawn of Shandong, 2007, 29 (1): 77-81], and case cylindrical foundation seawall [Li Wei, other society peace. PORT OF TIANJIN case cylindrical foundation breakwater structure engineering test [A] port engineering branch's exchange of technology collected works [C] Chinese Port engineering construction new development scientific seminar 2005, the 182-191 of BeiJing, China], barrel base [Shi Xiaochun, Gong Xiaonan, Yu Jianlin, Chen Guoxiang barrel base pull-out bond test research [J] building structure, 2003, 33 (8): 49-56] etc.For these works, Chinese scholars has been carried out a large amount of theoretical analysises and experimental study, and wherein centrifugal model test is important research means, and research contents mainly concentrates on bearing capacity, the deformation characteristic of pile foundation (single pile and a clump of piles); The pull-out behaviors of pile foundation; Stability under load action of offshore platform foundation, case cylindrical foundation, barrel base and distortion etc.The research of specializing at present this class formation thing work progress still belongs to rare,
In Geotechnical Engineering, also have the important test of a class to belong to vertical long distance motion, be cone penetration test, standard penetration test (SPT), these tests are used for site inspection, test findings can be used for determining soil body compactness, intensity, bearing capacity etc., also can be used for pro form bill pile bearing capacity, evaluate foundation liquefaction possibility etc., application is [< < engineering geology handbook > > editorial committee's engineering geology handbook [M] Beijing very extensively, China Construction Industry Press, 2007].But this class test is applied in centrifugal model test, except making especially small-sized feeler inspection conehead, also must develop special charger [M. Katagiri, M. Okamura, 1998. Cone penetration test. Centrifuge 98, Kimura, Kusakabe & Takemura (eds) Balkema, 1059-1065].
The vertical large stroke loading system that is applicable at present centrifugal model test there is not yet report.
Summary of the invention
The object of this invention is to provide the vertical large stroke loading system of a kind of centrifugal model test, be intended to solve the high acceleration of gravity of hydro-extractor following key issue after the match: prior art can not be carried out vertical large stroke loading.The present invention also will provide the method for testing of the vertical large stroke loading of this centrifugal model test.
The technical scheme that completes foregoing invention task is: the vertical large stroke loading system of centrifugal model test, by model casing, stepper motor, gear, worm and gear and load sensor, formed, stepper motor, gear and worm and gear are arranged on the top cover upper surface of model casing, described stepper motor is horizontally disposed with, turboshaft adopts ball-screw, ball-screw is vertically through model casing top cover, the below of model casing top cover, the lower end of turboshaft are provided with load sensor, and described stepping motor rotating shaft is connected to worm screw after gear reduction.
As a further improvement on the present invention, the vertical large stroke loading system of described centrifugal model test is also provided with guide type shoe, two guided ways of described guide type shoe are vertically fixed on the upper surface of model casing top cover, and the upper end of worm-wheel shaft is provided with slide block, and slide block is slidably connected with guided way.Adopt guiding trestle to guarantee that turboshaft only carries out vertical motion, turboshaft runs through turbine, realizes the maximum large stroke motion that reaches turboshaft length.
As a further improvement on the present invention, in described model casing, be provided with model.
As a further improvement on the present invention, the vertical large stroke loading system of described centrifugal model test is also provided with control system, described control system comprises single-chip microcomputer, for gathering the data of load sensor, the rate of loading of control step motor, with constant rate of loading (equi-strain rate control model) work, adjustable in setting range 0.02-8mm/min, stepless change.
1. this device is comprised of 3 parts: drive part, transmission loading part and control section;
2. drive part comprises: stepper motor and worm gear, and stepper motor, as drive source, drives worm gear to rotate;
3. transmission loading partly comprises: turboshaft, guiding trestle and pull pressure sensor, and turboshaft is converted into vertical rectilinear motion by the gyration of turbine, and under the efficient driving of turboshaft, vertical maximum is drawn (pressure) Li Keda 10 kN; Adopt guiding trestle to guarantee that turboshaft only carries out vertical motion, turboshaft runs through turbine, realizes the maximum large stroke motion that reaches turboshaft length; Turboshaft lower end connects pull pressure sensor, and Measurement accuracy applies vertically draws flattening pressure;
4. control section comprises single-chip microcomputer, and the rate of loading of control device is with constant rate of loading (equi-strain rate control model) work, adjustable in setting range 0.02-8mm/min, stepless change;
5. device adopts high-strength bolt and model casing to be connected to a fixed.
The technical scheme that realizes another goal of the invention of the present invention is: the vertical large stroke loading method of testing of centrifugal model test, comprises the following steps:
Step 1 is determined the vertical large stroke loading eigenwert that needs simulation, specifically refers to loading amplitude, rate of loading, by centrifugal model test likelihood, converts;
Step 2 is prepared model, and each parts are installed, and power lead, pickup wire are connected in pulpit by hydro-extractor slip ring;
Step 3 starter motor, adjusts disable motor behind the position of turboshaft and pull pressure sensor;
Step 4 is under the high gravity field of hydro-extractor, set rate of loading, starter motor, drive turboshaft and pull pressure sensor uniform motion (equi-strain rate control model), after band movable model, what load sensor started that record applies vertically draws (pressure) load, the displacement according to strain rate computation model under load, obtain load-displacement curve, until off-test.
Apparatus and method of the present invention have following characteristics:
1, can under the high gravity field of hydro-extractor, normally move; The layout that is conducive to geotechnological centrifugal model; Operation of the present invention is fool proof; The present invention can realize accurate control.
2, can carry out the vertical loading of large stroke, stroke can reach 15 cm.
3, with the work of strain control mode, promote constant rate, can to experimental study target, apply vertical load sustainedly and stably, rate of loading is adjustable in 0.02-8mm/min setting range, stepless change.
4, the vertical pressure compared with amplitude can be provided, amplitude can reach 10 kN.
5, can immediately record vertical load-displacement curve.
The present invention can carry out the vertical loading of large stroke; Can apply the vertical pressure of amplitude; Employing strain-type is controlled, and can apply sustainedly and stably lateral load, and rate of loading is adjustable; Can record vertical load-displacement curve in loading simultaneously; The layout that is conducive to geotechnological centrifugal model; Operation of the present invention is fool proof; The present invention can realize accurate control.
Accompanying drawing explanation
Fig. 1 is the embodiment of the present invention 1 structural representation.
Embodiment
Embodiment 1
Refer to shown in accompanying drawing 1, the vertical large stroke loading system 10 of centrifugal model test is comprised of model casing 6, stepper motor 1, gear 2, worm and gear 3, load sensor 4, guide type shoe 5 and control system 8.Stepper motor 1, gear 2 and worm and gear 3 are arranged on the upper surface of model casing top cover 61, stepper motor 1 is horizontally disposed with, turboshaft 31 adopts ball-screw, turboshaft 31 is vertical through model casing top cover 61, the lower end of the below of model casing top cover 61, turboshaft 31 is provided with load sensor 4, and stepper motor 1 rotating shaft is connected to worm screw after gear 2 slows down.In model casing 6, be provided with model 7.
Two guided ways 51 of guide type shoe 5 are vertically fixed on the upper surface of model casing top cover 61, and the upper end of worm-wheel shaft 31 is provided with slide block 32, and slide block 32 and guided way slidably 51 are connected.
Control system 8, comprises single-chip microcomputer, for gathering the data of load sensor, and the rate of loading of control step motor, with constant rate of loading (equi-strain rate control model) work, adjustable in setting range 0.02-8mm/min, stepless change.
The vertical large stroke loading system of centrifugal model test is comprised of 3 parts: drive part, transmission loading part and control section.Drive part comprises: stepper motor 1 and worm gear 3 worm screws, and stepper motor 1, as drive source, drives worm gear 31 to rotate; Transmission loading partly comprises: turboshaft 31, guiding trestle 5 and pull pressure sensor 4, and turboshaft 31 is converted into vertical rectilinear motion by the gyration of turbine, and under the efficient driving of turboshaft 31, vertical maximum is drawn (pressure) Li Keda 10 kN; Adopt guiding trestle to guarantee that 31 of turboshafts carry out vertical motion, turboshaft 31 runs through turbine, realizes the maximum large stroke motion that reaches turboshaft length; Turboshaft 31 lower ends connect pull pressure sensor, and Measurement accuracy applies vertically draws flattening pressure; Control section comprises single-chip microcomputer, and the rate of loading of opertaing device is with constant rate of loading (equi-strain rate control model) work, adjustable in setting range 0.02-8mm/min, stepless change.Equipment adopts high-strength bolt and model casing to be connected to a fixed.
The vertical large stroke loading method of testing of centrifugal model test, comprises the following steps:
Step 1 is determined the vertical large stroke loading eigenwert that needs simulation, specifically refers to loading amplitude, rate of loading, by centrifugal model test likelihood, converts;
Step 2 is prepared model soft soil foundation, model barrel base seawall is positioned on ground; This device is installed, power lead, pickup wire are connected in pulpit by hydro-extractor slip ring;
Step 3 starter motor, adjusts disable motor behind the position of turboshaft and pull pressure sensor;
Step 4 is under the high gravity field of hydro-extractor, set rate of loading, starter motor, drive turboshaft and pull pressure sensor uniform motion (equi-strain rate control model), after band movable model, load sensor starts the vertical pressure load that record applies, the heavy work progress that passes through of simulation barrel base seawall, by the data variation of power sensor, judge whether heavy pass through put in place (i.e. bucket top board inner side whether touch basal plane) of barrel base seawall, displacement according to strain rate computation model under load, obtains load-displacement curve, until off-test.
Claims (5)
1. the vertical large stroke loading system of centrifugal model test, by model casing, stepper motor, gear, worm and gear and load sensor, formed, it is characterized in that, stepper motor, gear and worm and gear are arranged on the top cover upper surface of model casing, described stepper motor is horizontally disposed with, and turboshaft adopts ball-screw, and ball-screw is vertically through model casing top cover, the below of model casing top cover, the lower end of turboshaft are provided with load sensor, and described stepping motor rotating shaft is connected to worm screw after gear reduction.
2. device according to claim 1, it is characterized in that, the vertical large stroke loading system of described centrifugal model test is also provided with guide type shoe, two guided ways of described guide type shoe are vertically fixed on the upper surface of model casing top cover, the upper end of worm-wheel shaft is provided with slide block, and slide block is slidably connected with guided way.
3. device according to claim 1, is characterized in that, in described model casing, is provided with model.
4. device according to claim 1, it is characterized in that, the vertical large stroke loading system of described centrifugal model test is also provided with control system, described control system comprises single-chip microcomputer, for gathering the data of load sensor, the rate of loading of control step motor, with constant rate of loading work, adjustable in setting range 0.02-8mm/min, stepless change.
5. the vertical large stroke loading method of testing of the centrifugal model test of device according to claim 1, is characterized in that, step is as follows:
Step 1 is determined the vertical large stroke loading eigenwert that needs simulation, specifically refers to loading amplitude, rate of loading, by centrifugal model test likelihood, converts;
Step 2 is prepared model, and each parts are installed, and power lead, pickup wire are connected in pulpit by hydro-extractor slip ring;
Step 3 starter motor, adjusts disable motor behind the position of turboshaft and pull pressure sensor;
Step 4 is under the high gravity field of hydro-extractor, set rate of loading, starter motor, drive turboshaft and pull pressure sensor uniform motion, after band movable model, what load sensor started that record applies vertically draws load, the displacement according to strain rate computation model under load, obtain load-displacement curve, until off-test.
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| CN201410292489.4A CN104132802A (en) | 2014-06-26 | 2014-06-26 | Vertical large-stroke loading device and test method for centrifugation model test |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105158443A (en) * | 2015-09-25 | 2015-12-16 | 西南交通大学 | Loading system for applying vertical loads based on geotechnical centrifuge |
| CN105258969A (en) * | 2015-12-10 | 2016-01-20 | 中国工程物理研究院总体工程研究所 | Concentrated force loading test system in acceleration field |
| CN107044906A (en) * | 2017-03-16 | 2017-08-15 | 水利部交通运输部国家能源局南京水利科学研究院 | A kind of super gravity field shaketalle test adds discharge mechanism and method |
| CN111157353A (en) * | 2019-12-31 | 2020-05-15 | 同济大学 | Electromagnetic type power loading system for geotechnical centrifuge |
| CN115112349A (en) * | 2022-08-29 | 2022-09-27 | 水利部交通运输部国家能源局南京水利科学研究院 | Load decoupling device and ocean wave flow centrifugal model test system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105158443A (en) * | 2015-09-25 | 2015-12-16 | 西南交通大学 | Loading system for applying vertical loads based on geotechnical centrifuge |
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| CN107044906A (en) * | 2017-03-16 | 2017-08-15 | 水利部交通运输部国家能源局南京水利科学研究院 | A kind of super gravity field shaketalle test adds discharge mechanism and method |
| CN111157353A (en) * | 2019-12-31 | 2020-05-15 | 同济大学 | Electromagnetic type power loading system for geotechnical centrifuge |
| CN115112349A (en) * | 2022-08-29 | 2022-09-27 | 水利部交通运输部国家能源局南京水利科学研究院 | Load decoupling device and ocean wave flow centrifugal model test system |
| CN115112349B (en) * | 2022-08-29 | 2023-03-14 | 水利部交通运输部国家能源局南京水利科学研究院 | Load decoupling device and ocean storm-flow centrifugal model test system |
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Application publication date: 20141105 |