CN104374649A - Testing device and method for observing shear deformation failure characteristics between tubular pile and grouting soil body - Google Patents

Testing device and method for observing shear deformation failure characteristics between tubular pile and grouting soil body Download PDF

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Publication number
CN104374649A
CN104374649A CN201410669314.0A CN201410669314A CN104374649A CN 104374649 A CN104374649 A CN 104374649A CN 201410669314 A CN201410669314 A CN 201410669314A CN 104374649 A CN104374649 A CN 104374649A
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China
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pile tube
soil
shear deformation
antetheca
slip casting
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CN201410669314.0A
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Chinese (zh)
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CN104374649B (en
Inventor
戚玉亮
唐孟雄
胡贺松
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广州市建筑科学研究院有限公司
广州市建筑科学研究院新技术开发中心有限公司
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Priority to CN201410669314.0A priority Critical patent/CN104374649B/en
Publication of CN104374649A publication Critical patent/CN104374649A/en
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Abstract

The invention discloses a testing device for observing shear deformation failure characteristics between a tubular pile and a grouting soil body. The testing device comprises a fixing platform, a tubular pile model testing box, a loading mechanism and a monitoring system, wherein the fixing platform comprises a base plate, a top plate and a plurality of connecting screw rods; the tubular pile model testing box comprises a bottom wall, two side walls, a rear wall and a front wall, wherein the front wall is movably arranged between the side walls, and is made of colorless transparent organic glass; the monitoring system comprises a displacement sensor, a pressure sensor and a strain rosette group arranged on the outer surface of the tubular pile; the strain rosette group comprises a plurality of strain rosettes which are uniformly distributed along the central axis direction of the tubular pile, and are connected with an automatic recorder. According to the invention, a semi-circular pipe pile is adopted, so that the shear deformation failure characteristics between the tubular pile and the grouting soil body can be observed conveniently, and the shear resistant intensity between the tubular pile and the grouting soil body can be observed; a camera device is adopted for recording the video of the testing process; the visual testing enables the analysis to be relatively intuitive.

Description

A kind of for observing test unit and the method for shear deformation breaks down feature between pile tube and the slip casting soil body
Technical field
The invention belongs to civil engineering work test unit technical field, being specifically related to a kind of for observing test unit and the method for shear deformation breaks down feature between pile tube and the slip casting soil body.
Background technology
Between structure and the slip casting ground soil body, Research on Mechanical Properties is one of the important topic in Geotechnical Engineering field, is to solve interactional prerequisite between structure and the slip casting soil body.Traditional experiment device: simple shear apparatus, direct shear apparatus, torsion shear apparatus and circular loading shear apparatus etc., all artificial putative structure is failure mechanics with the contact interface of soil, and in fact structure and Soil Interface shear failure time interface shear strength may, higher than the shear resistance of the soil body itself, make shear breakage occur in inside soil body.For the cement injection soil body that structure and surrounding are wrapped up, the cohesive strength of usual grout and structure is higher than common slip casting soil strength, and shear breakage will occur in slip casting inside soil body, forms one and has certain thickness shear failure band.Therefore, existing shearing test device is difficult to truly, measures exactly and shear property between observation and analysis structure and the slip casting soil body.
Pile tube is the conventional base form of high-rise, the main resistance to compression as buildings, resistance to plucking and horizontal force resistant etc.Adopt the pile tube that major diameter drill while drilling and casing (patent No.: ZL 200820158894.7) is constructed, outside tube wall, grout injection (bore diameter is the large 40 ~ 100mm of pile tube diameter comparatively) is to improve the side friction of pile tube, but, the Discontinuous Deformations such as the shearing of pile tube and its cement paste around pile soil body, the changing of the relative positions and disengagement destroy problem, still lack and go deep into systematic research.Main cause is current structure is in plane with the shear test equipment major part of soil, the rare shear test research about cambered surface, size is general also less, cannot model configuration and the slip casting soil body load or actual mechanical behavior under CYCLIC LOADING condition in dullness.
Summary of the invention
The object of the invention is to solve existing testing equipment measuring accuracy not high, test intuitive is not strong, it is unreliable to sample, the technical matters that test findings discreteness is large, provide a kind of easy and simple to handle, test accurately, sample is actual and be convenient to observe shearing test device and the battery of tests method of pile tube and slip casting soil body shear deformation breaks down feature close to engineering.
In order to solve the problem, the present invention is achieved by following technical scheme:
Of the present invention for observing the test unit of shear deformation breaks down feature between pile tube and the slip casting soil body, comprise stationary platform, setting pile tube model test box on the stationary platform, arrange the load maintainer and the monitoring system that provide pressure on the stationary platform to pile tube model test box, described stationary platform comprises some connecting screw rods of base plate, top board and connecting bottom board and top board;
Described pile tube model test box comprise diapire, with vertically disposed two sidewalls of diapire, the rear wall being connected two sidewalls and antetheca, described antetheca is movably arranged between two side, and described antetheca adopts colourless transparent resin glass to make;
Described load maintainer is arranged on described top board, and is positioned at the top of described pile tube;
Described monitoring system comprise be arranged on pile tube top displacement transducer, be arranged on the pressure transducer on load maintainer and be arranged on a row or the above strain rosette group of a row of described pile tube outside surface; Described strain rosette group is uniformly distributed along described pile tube circumferencial direction;
Described strain rosette group comprises along the equally distributed some strain rosettes of described pile tube central axis direction, and described strain rosette is connected with self-recording device.
Further, described two side is provided with chute relative to the side of described antetheca, and the two ends of described antetheca are arranged in described chute; Position corresponding with described antetheca on described diapire is provided with the groove coordinated with described antetheca; The two ends that described antetheca is connected with described sidewall are provided with rib.
Further, the xsect of described pile tube is semi-circular shape, and the vertical section of described pile tube contacts with the antetheca of described casing.
Further, the present invention also comprises camera head, and described camera head is by connecting bearing settlement on top board.
Further, described load maintainer is lifting jack or pressure testing machine.
Further, described pile tube top is provided with pressure-bearing steel plate, and described load maintainer acts on pressure-bearing steel plate.
Further, the xsect of described pile tube is semicircle, and the vertical section of described pile tube directly contacts with described casing with transparent glass walls.To facilitate the deformation that shear failure occurs between observation pile tube and the different-thickness slip casting soil body, draw shear failure envelope.
Further, described base plate is provided with the limited block limiting described box location.
For observing a test method for shear deformation breaks down feature between pile tube and the slip casting soil body, its step comprises:
(1) open the top board of stationary platform, test casing is fixed on base plate;
(2) pan soil is laid at bottom half;
(3) tangent plane of semicircle pile tube being close to glass wall is placed on pan soil, at the outer sheathed semi-circular shape steel bushing corresponding with pile tube of pile tube, remains for the space of grout injection between steel bushing inside surface and pile tube outside surface in advance; Internal diameter 20mm ~ the 100mm larger than the external diameter of described pile tube of described steel bushing, can according to the cement injection body needing making different-thickness of experimental study;
(4) described pile tube outside surface posts some strain rosettes; Pile tube top is provided with displacement transducer;
(5) fill casing with the soil body, and the soil body is tamped;
(6) grout injection between pile tube and steel bushing, and grout injection is while extract steel bushing, or described steel bushing is extracted before grout initial set; Pour into the grout of specific water cement ratio between described pile tube and the described soil body, the water cement ratio of described grout is 0.4 ~ 1.0, for sand preferably 0.7;
(7) top board of stationary platform is resetted, and install load maintainer;
(8) load maintainer applies vertical pressure by bearing plate to pile tube from top, progressively increases pressure, until there is shear failure between pile tube and surrounding cement injecting cement paste; Described load maintainer is provided with pressure transducer;
(9) data of described strain rosette, displacement transducer and pressure transducer are recorded.
Further, described in the casing of concrete tubular pile is housed before the pressure is applied, need the setting time more than 28 days.
Further, the top board of described stationary platform is provided with shooting and arranges, described casing is that transparent pmma material is made, and described shooting arranges and shoots with video-corder experimentation through casing
Compared with prior art, the invention has the beneficial effects as follows:
The present invention is by testing concrete tubular pile model, with the good simulation of the concrete tubular pile in reality, test result more accurately, reliable, discreteness is little, camera head is adopted process of the test to be recorded a video, be conducive to further analytical test result, judge the breakdown point place of pile tube and the slip casting soil body more intuitively, for theoretical analysis and engineering practice provide reliable basic data.
Adopt the stationary platform connected up and down, transmitted acting force and the reacting force of load maintainer by connecting screw rod, make it form one, make test unit more stable.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail, wherein:
Fig. 1 is of the present invention for observing the structural representation of the test unit of shear deformation breaks down feature between pile tube and the slip casting soil body;
Fig. 2 is the structural representation of semi-circular shape pile tube;
Fig. 3 is the structural representation of semicircular ring steel bushing;
Fig. 4 is the structural representation of semi-circular shape pile tube model;
Fig. 5 is the partial enlarged drawing of A in Fig. 2.
In figure: 1-casing, 11-pan soil, the 12-soil body, 13-antetheca, 131-rib, 14-chute, 2-semi-circular shape pile tube, 21-displacement transducer, 22-strain rosette, 23-grout, 24-space, 25-steel bushing, 3-pressure-bearing steel plate, 4-top board, 41-reinforcement, 5-connecting screw rod, 6-load maintainer, 61-pressure transducer, 7-connects bearing, 8-camera head, 9-base plate.
Embodiment
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein is only for instruction and explanation of the present invention, is not intended to limit the present invention.
As shown in FIG. 1 to 3, of the present invention for observing the test unit of shear deformation breaks down feature between pile tube and the slip casting soil body, comprise stationary platform, setting pile tube model on the stationary platform, the load maintainer 6 and the monitoring system that provide pressure on the stationary platform to pile tube model are set.
Described stationary platform comprises top board 4, base plate 9 and four connecting screw rods 5 for being connected top board 4 and base plate 9, and described connecting screw rod 5 is connected and fixed by nut and top board 4 or base plate 9, described base plate 9 is provided with the limited block for fixing pile tube model; Described top board 4 is provided with the reinforcement 41 of some its intensity of increase.
Described pile tube model test box comprises the casing 1 be arranged on base plate 9, is arranged on the semi-circular shape pile tube 2 of casing 1 inside and fills the soil body 12 of casing 1, and the bottom of described casing is equipped with one deck pan soil 11; Between described semi-circular shape pile tube 2 and the described soil body 12, filling concrete starches 23, and the water cement ratio of described grout is 0.6 ~ 0.8, for sand preferably 0.7.
Described casing 1 comprise diapire, with vertically disposed two sidewalls of diapire, the rear wall being connected two sidewalls and antetheca 13, described antetheca 13 is movably arranged between two side, described sidewall is provided with chute 14 relative to the side of described antetheca 13, the two ends that described antetheca 13 is connected with described sidewall 14 are provided with rib 131, and the rib 131 of described antetheca 13 is arranged in described chute 14; Position corresponding with described antetheca 13 on described diapire is provided with the groove coordinated with described antetheca; Described antetheca 13 adopts colourless transparent resin glass to make.
The xsect of described semi-circular shape pile tube 2 is semi-circular shape, and its perpendicular directly contacts with the wall body of described casing 1.Described casing 1 is made by colourless transparent resin glass, the deformation of shear failure occurs between convenient observation pile tube and grout, draws shear failure envelope.
The outside surface of described semi-circular shape pile tube 2 is provided with a row strain rosette group, described strain rosette group is arranged on the centre position of semi-circular shape pile tube 2 outer wall, often organize strain rosette group and comprise five spaced strain rosettes 22, described strain rosette 22 is uniformly distributed setting along the central axis direction of described semi-circular shape pile tube 2.Described strain rosette is triaxial strain flower, and described strain rosette 22 is connected with self-recording device, the data that described self-recording device monitors for receiving and record described strain rosette 22.The top of described semi-circular shape pile tube 2 is provided with pressure-bearing steel plate 3.
Described load maintainer 6 is arrange lifting jack on the top plate 4, and the bottom of described lifting jack, just to the center of described pressure-bearing steel plate 3, the bottom of described lifting jack is provided with pressure transducer 61.
Described pressure-bearing steel plate 3 is provided with displacement transducer 21, for monitoring the perpendicular displacement situation of pressure-bearing steel plate 3 under the pressure of lifting jack.
The present invention also comprises camera head 8, and described camera head 8 is fixedly installed on the top plate 4 by connecting bearing 7, and described camera head 8 faces the perpendicular position of semi-circular shape pile tube 2 through water white casing 1, shoots with video-corder process of the test.
Of the present invention for observing the test method of shear deformation breaks down feature between pile tube and the slip casting soil body, its step comprises:
(1) open the top board 4 of stationary platform, test casing is fixed on base plate 4;
(2) bottom casing 1, pan soil 11 is laid;
(3) pile tube 2 of semicircular ring shape is placed on pan soil 11, the perpendicular of semi-circular shape pile tube 2 contacts with the wall of casing 1, at the outer sheathed steel bushing 25 corresponding with pile tube of semi-circular shape pile tube 2, between steel bushing 25 inside surface and pile tube outside surface, remain for the space 24 of fill concrete in advance; Described pile tube outside surface posts some strain rosettes 22;
(3) pile tube top arranges pressure-bearing steel plate 3, and arranges displacement transducer 21 on pressure-bearing steel plate 3;
(4) fill casing with the soil body 12, and the soil body 12 is tamped;
(5) grout injection 23 between semi-circular shape pile tube 2 and steel bushing 25, by concrete 23 vibrating compacting, and concrete perfusion is while extract steel bushing 25 or extract described steel bushing 25 before grout 23 initial set; Internal diameter 20mm ~ the 100mm larger than the external diameter of described pile tube of described steel bushing 25, according to the cement injection body 23 needing making different-thickness of experimental study.
(6) casing 1 having poured into concrete 23 is placed more than 28 days, treat that it solidifies.
(7) top board of stationary platform is resetted, and install load maintainer, and open camera head 8.
(8) jack pair semi-circular shape pile tube 2 top applies pressure, increases the pressure of lifting jack, until semi-circular shape pile tube 2 loses load-bearing capacity, namely between pile tube and cement injection, the soil body, shear failure occurs; Described lifting jack is provided with pressure transducer 61.
(9) record, analyze the process of the test that described strain rosette 22, displacement transducer 21, the data of pressure transducer 61 and camera head 8 shoot with video-corder, as the basic data of analysis of experiments.
Observe other structure of the test unit of shear deformation breaks down feature between pile tube and the different-thickness slip casting soil body see prior art described in the present embodiment.
The above, it is only preferred embodiment of the present invention, not any pro forma restriction is done to the present invention, therefore everyly do not depart from technical solution of the present invention content, the any amendment done above embodiment according to technical spirit of the present invention, equivalent variations and modification, all still belong in the scope of technical solution of the present invention.

Claims (10)

1. one kind for observing the test unit of shear deformation breaks down feature between pile tube and the slip casting soil body, comprise stationary platform, setting pile tube model test box on the stationary platform, the load maintainer and the monitoring system that provide pressure on the stationary platform to pile tube model test box be set, it is characterized in that:
Described stationary platform comprises some connecting screw rods of base plate, top board and connecting bottom board and top board;
Described pile tube model test box comprise diapire, with vertically disposed two sidewalls of diapire, the rear wall being connected two sidewalls and antetheca, described antetheca is movably arranged between two side, and described antetheca adopts colourless transparent resin glass to make;
Described load maintainer is arranged on described top board, and is positioned at the top of described pile tube;
Described monitoring system comprise be arranged on pile tube top displacement transducer, be arranged on the pressure transducer on load maintainer and be arranged on a row or the above strain rosette group of a row of described pile tube outside surface; Described strain rosette group is uniformly distributed along described pile tube circumferencial direction;
Described strain rosette group comprises along the equally distributed some strain rosettes of described pile tube central axis direction, and described strain rosette is connected with self-recording device.
2. according to claim 1 for observing the test unit of shear deformation breaks down feature between pile tube and the slip casting soil body, it is characterized in that: described two side is provided with chute relative to the side of described antetheca, the two ends of described antetheca are arranged in described chute; Position corresponding with described antetheca on described diapire is provided with the groove coordinated with described antetheca; The two ends that described antetheca is connected with described sidewall are provided with rib.
3. according to claim 2 for observing the test unit of shear deformation breaks down feature between pile tube and the slip casting soil body, it is characterized in that: the xsect of described pile tube is semi-circular shape, and the vertical section of described pile tube contacts with the antetheca of described casing.
4. observe the test unit of shear deformation breaks down feature between pile tube and the slip casting soil body according to claim 2, it is characterized in that: also comprise camera head, described camera head is by connecting bearing settlement on top board.
5. according to claim 1 for observing the test unit of shear deformation breaks down feature between pile tube and the slip casting soil body, it is characterized in that: described load maintainer is lifting jack or pressure testing machine.
6. according to claim 1 for observing the test unit of shear deformation breaks down feature between pile tube and the slip casting soil body, it is characterized in that: described pile tube top is provided with pressure-bearing steel plate, described load maintainer acts on described pressure-bearing steel plate.
7. according to any one of claim 1 to 6 for observing the test unit of shear deformation breaks down feature between pile tube and the slip casting soil body, it is characterized in that: described base plate is provided with the limited block limiting described box location.
8. observe a test method for shear deformation breaks down feature between pile tube and the slip casting soil body, its step comprises:
(1) pan soil is laid at bottom half;
(2) tangent plane of semicircle pile tube being close to glass wall is placed on pan soil, at the outer sheathed steel bushing corresponding with pile tube of pile tube, remains for the space of grout injection between steel bushing inside surface and pile tube outside surface in advance; Described pile tube outside surface posts some strain rosettes; Pile tube top is provided with displacement transducer;
(3) fill casing with the soil body, and the soil body is tamped;
(4) grout injection between pile tube and steel bushing, and grout injection is while extract steel bushing or extract described steel bushing before grout initial set;
(5) casing that pile tube and the cement injection soil body solidified is housed is placed on the base plate of stationary platform;
(6) load maintainer applies vertical pressure by bearing plate to pile tube from top, progressively increases pressure, until there is shear failure between pile tube and surrounding cement injecting cement paste; Described load maintainer is provided with pressure transducer;
(7) data of described strain rosette, displacement transducer and pressure transducer are recorded.
9. observe the test method of shear deformation breaks down feature between pile tube and the slip casting soil body according to claim 8, it is characterized in that: described in the casing of concrete tubular pile is housed before load maintainer applies pressure, leave standstill the setting time more than 28 days.
10. observe the test method of shear deformation breaks down feature between pile tube and the slip casting soil body according to claim 8, it is characterized in that: described stationary platform is just provided with camera head to the side of organic glass wall.
CN201410669314.0A 2014-11-20 2014-11-20 A kind of experimental rig and method for being used to observe shear deformation breaks down feature between pile tube and the slip casting soil body CN104374649B (en)

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CN105064426A (en) * 2015-09-08 2015-11-18 深圳市路桥建设集团有限公司 Indoor testing device for minitype grouting gravel steel pipe piles and testing method of indoor testing device
CN105241754A (en) * 2015-09-08 2016-01-13 吉林建筑大学 Half-surface pile small-scale-model vertical compression test device
CN105507352A (en) * 2016-02-04 2016-04-20 江苏城工建设科技有限公司 On-site self-balancing anti-pulling test method for grouted core of pipe pile
CN105649121A (en) * 2016-03-18 2016-06-08 青岛理工大学 Device for arranging microsensor on surface of simulation pile soil interface shearing concrete sample
CN105804126A (en) * 2016-03-18 2016-07-27 青岛理工大学 Method for arranging microsensors on surface of pile soil interface shearing simulation concrete sample
CN105818166A (en) * 2016-06-16 2016-08-03 芜湖润众机器人科技有限公司 Box structure for manipulator
CN105910920A (en) * 2016-06-22 2016-08-31 青岛理工大学 Temperature control pile-soil interface direct shear test device
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CN106351653A (en) * 2016-09-06 2017-01-25 山东大学 Hole-drilling-sampling accurate-positioning portable drilling machine device for concrete sample and method
CN107478812A (en) * 2017-07-10 2017-12-15 三峡大学 Rock And Soil large dosage expansion cement slurry expansion process visualization device and application method
CN108593463A (en) * 2018-08-02 2018-09-28 中南大学 A kind of pile-soil interface shearing mechanics characteristic test device
CN108593464A (en) * 2018-08-02 2018-09-28 中南大学 A kind of test method of pile-soil interface shearing mechanical characteristic
CN108951717A (en) * 2018-05-07 2018-12-07 重庆大学 A kind of Multifunctional pile base model test box device and its application method
CN109187198A (en) * 2018-09-14 2019-01-11 太原理工大学 A kind of method of on-the-spot test injecting cement paste set strength and shearing strength
CN109975109A (en) * 2019-04-25 2019-07-05 华北理工大学 A kind of the test support of sleeve circumferential direction and displacement meter arrangement apparatus and method
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CN105064426A (en) * 2015-09-08 2015-11-18 深圳市路桥建设集团有限公司 Indoor testing device for minitype grouting gravel steel pipe piles and testing method of indoor testing device
CN105064426B (en) * 2015-09-08 2017-03-29 深圳市路桥建设集团有限公司 Miniature slip casting rubble steel-pipe pile laboratory testing rig and its test method
CN105507352B (en) * 2016-02-04 2017-09-29 江苏城工建设科技有限公司 Pile tube fills the live self-balancing pullout tests method of core
CN105507352A (en) * 2016-02-04 2016-04-20 江苏城工建设科技有限公司 On-site self-balancing anti-pulling test method for grouted core of pipe pile
CN105804126A (en) * 2016-03-18 2016-07-27 青岛理工大学 Method for arranging microsensors on surface of pile soil interface shearing simulation concrete sample
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CN108593463A (en) * 2018-08-02 2018-09-28 中南大学 A kind of pile-soil interface shearing mechanics characteristic test device
CN108593463B (en) * 2018-08-02 2020-06-16 中南大学 Pile-soil contact surface shearing mechanical property testing device
CN108593464B (en) * 2018-08-02 2020-07-07 中南大学 Method for testing shear mechanical property of pile-soil contact surface
CN109187198A (en) * 2018-09-14 2019-01-11 太原理工大学 A kind of method of on-the-spot test injecting cement paste set strength and shearing strength
CN110045084A (en) * 2019-03-14 2019-07-23 河海大学 The experimental rig and method of foundation structure and the variation of Soil Interface microscopical structure under observation water
CN109975109A (en) * 2019-04-25 2019-07-05 华北理工大学 A kind of the test support of sleeve circumferential direction and displacement meter arrangement apparatus and method

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