CN112858043A - Soil-structure contact surface shear test device capable of realizing bidirectional high-frequency vibration - Google Patents
Soil-structure contact surface shear test device capable of realizing bidirectional high-frequency vibration Download PDFInfo
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- 238000010008 shearing Methods 0.000 abstract description 33
- 230000003068 static effect Effects 0.000 abstract description 10
- 238000000034 method Methods 0.000 abstract description 5
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- G—PHYSICS
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- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/24—Investigating strength properties of solid materials by application of mechanical stress by applying steady shearing forces
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
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- G01N2203/0641—Indicating or recording means; Sensing means using optical, X-ray, ultraviolet, infrared or similar detectors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
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Abstract
The invention relates to a soil-structure contact surface shearing test device capable of realizing bidirectional high-frequency vibration, which comprises a test unit, a loading unit and a measurement and control unit, wherein the test unit comprises a test bench, an upper shearing box fixing mechanism arranged on the test bench, an upper shearing box arranged on the upper shearing box fixing mechanism, a double-slide rail motion platform arranged on the test bench, a tray arranged on the double-slide rail motion platform and a structure panel arranged on the tray and positioned below the upper shearing box, and the loading unit comprises an X-direction voice coil motor loading mechanism, a Y-direction voice coil motor loading mechanism and a Z-direction loading mechanism, wherein the X-direction voice coil motor loading mechanism, the Y-direction voice coil motor loading mechanism and the Z-direction loading mechanism are respectively matched with. Compared with the prior art, the invention realizes the joint loading of the bidirectional high-frequency vibration and the static shearing of the contact surface and the synchronous acquisition of multiple responses, avoids the friction between the upper shearing box and the structural panel in the shearing process and realizes the stable application of the vertical pressure in the high-frequency vibration process.
Description
Technical Field
The invention belongs to the technical field of geotechnical tests, and relates to a soil-structure contact surface shear test device capable of realizing bidirectional high-frequency vibration, which is suitable for researching the mechanical characteristics of a contact surface between a discrete material (sand, gravel and the like) and a continuous material (concrete, steel and the like) in a vibration environment, and particularly can be used for researching the mechanical characteristics of the contact surface between the discrete material and the continuous material under the single/bidirectional high-frequency vibration combined static shear condition.
Background
Rail transit system induced vibrations contain a large number of high frequency components. At present, in the existing high-speed railway system with the speed of 300km per hour, the vibration dominant frequency of the top of the bridge pier of the viaduct can reach 250-350Hz[1]High-frequency vibration components with the frequency of up to 60Hz also exist in the foundation along the line[2][3]. The vibration frequency of the tunnel wall induced by the subway operation is concentrated above 50Hz, and higher frequency components even reach 1000Hz[4][5]. Such high frequency vibrations transmitted to the earth-structure interface result in fluidization of the interface[6]Therefore, the damage such as reduction of bearing capacity, increase of structural settlement and the like is caused, and the service safety of the rail transit structure is directly threatened. The earth-structure interface is abundantly present in rail transit systems, especially in their infrastructure, such as the pile-earth interface of high-speed rail pile foundations, the tunnel wall-earth interface of tunnel structures. Therefore, the research on the mechanical properties of the soil-structure contact surface under high-frequency vibration has very important academic and engineering significance.
At present, test equipment for researching mechanical properties of soil-structure contact surfaces is mainly a contact surface shearing instrument in a direct shearing mode and a single shearing mode. The Chinese patent with publication number CN102607966A discloses a large contact surface characteristic direct shear apparatus under the action of cyclic load, wherein a servo motor and an automatic elevator device are introduced into a frame of the direct shear apparatus to replace an original vertical load applying device, so that the experimental study of the shear characteristic of an interface under the action of normal cyclic load is realized. The Chinese patent with the publication number of CN110174317A discloses a contact surface bidirectional shear test device, which is additionally provided with an X/Y-direction shear transmission device, an X/Y-direction pushing device and an X/Y-direction moving device on the basis of a traditional contact surface shear instrument, and realizes the test research on the stress deformation characteristics of the contact surface in different directions. Chinese utility model patent publication No. CN210376010U discloses an interface vibration single shear test device for simulating dynamic contact problem, which adopts an electromagnetic vibration table to realize the effect of applying high-frequency vibration to the contact surface.
In summary, the current contact surface shearing instrument can respectively and independently realize single effects of normal low-frequency cyclic loading, bidirectional static shearing and tangential unidirectional high-frequency vibration loading, cannot realize a loading mode of tangential bidirectional high-frequency vibration combined static shearing, and is difficult to simulate the real stress condition of the soil-structure contact surface in a rail transit system. In addition, the problem of normal force fluctuation of the contact surface caused by normal inertial force caused by tangential high-frequency vibration is another technical problem to be solved urgently by the test instrument of the type.
Reference documents:
[1]Feng SJ,Zhang XL,Wang L,et al.In situ experimental study on high speed train induced ground vibrations with the ballast-less track[J].Soil Dynamics and Earthquake Engineering,2017,102:195–214.
[2]Zhai W,Wei K,Song X,et al.Experimental investigation into ground vibrations induced by very high speed trains on a non-ballasted track[J].Soil Dynamics and Earthquake Engineering,2015,72:24-36.
[3] the vibration transmission characteristic test research of a high-speed railway track-bridge-soil body system [ J ] vibration and impact, 2019,38(17):58-64.
[4] Liu Bi lamp, Song Ruixiang, Wu Yubin, Zhang bin.
[5] Measuring and analyzing track-tunnel-stratum vibration during subway operation [ J ] vibration, testing and diagnosing 2018,38(02) 260-.
[6]Johnson PA,Carmeliet J,Savage HM,et al.Dynamically triggered slip leading to sustained fault gouge weakening under laboratory shear conditions[J].Geophysical Research Letters,2016,43(4):1559-1565.
Disclosure of Invention
The invention aims to provide a soil-structure contact surface shear test device capable of realizing bidirectional high-frequency vibration, which has the function of applying tangential bidirectional high-frequency vibration combined with static shear load and solves the problem of normal force fluctuation of a contact surface caused by normal inertial force caused by high-frequency vibration.
The purpose of the invention can be realized by the following technical scheme:
the utility model provides a can realize two-way high-frequency vibration's soil-structure contact surface shear test device, the device includes test unit, loading unit and measurement and control unit, test unit include the test bench, set up on the test bench shear box fixed establishment, set up last shear box on last shear box fixed establishment, set up two slide rail motion platform on the test bench, set up the tray on two slide rail motion platform and set up on the tray and lie in the structure panel who shears the box below, loading unit including respectively with the X of tray looks adaptation to voice coil motor loading mechanism, Y to voice coil motor loading mechanism and with the Z of last shear box looks adaptation to loading mechanism, measurement and control unit respectively with test unit, loading unit looks adaptation. The measurement and control unit can measure data such as displacement, force, acceleration and the like.
Further, go up shear box fixed establishment include a plurality of vertical settings and fix the support column on the test bench, all overlap on every support column and be equipped with a pair of bolt, go up shear box on set up with the through-hole of support column looks adaptation, the support column pass corresponding through-hole, a pair of bolt on every support column is blocked respectively and is established top, the bottom of last shear box.
Further, the width of the upper cutting box in the Y direction is larger than the width of the structural panel and the tray in the Y direction.
Further, X to voice coil motor loading mechanism include first voice coil motor module, first step motor, first single slide rail motion platform, first linear slide rail and first connecting piece, first step motor and first single slide rail motion platform fixed setting respectively on the test bench, first voice coil motor module set up on first single slide rail motion platform, first linear slide rail set up in the tray side, the one end of first voice coil motor module link to each other with first step motor, the other end links to each other with first linear slide rail through first connecting piece.
Further, Y to voice coil motor loading mechanism include second voice coil motor module, second step motor, the single slide rail motion platform of second, second linear slide rail and second connecting piece, second step motor and the single slide rail motion platform of second fixed the setting respectively on the test bench, second voice coil motor module set up on the single slide rail motion platform of second, the setting of second linear slide rail in the tray side, the one end of second voice coil motor module link to each other with the second step motor, the other end passes through the second connecting piece and links to each other with second linear slide rail.
Further, the measurement and control unit comprises a first dynamic force sensor and a second dynamic force sensor, the first dynamic force sensor is located between the first voice coil motor module and the first connecting piece, and the second dynamic force sensor is located between the second voice coil motor module and the second connecting piece.
Further, Z include air compressor, electrohydraulic servo valve, cylinder, bottom end rail, first stand, second stand, entablature and dowel steel to loading mechanism, the unit of observing and controling including setting up Z on the test bench bottom surface to force transducer, air compressor, electrohydraulic servo valve and cylinder be linked together in proper order, the top of cylinder link to each other with Z to force transducer, the bottom links to each other with the bottom end rail, the bottom of first stand and second stand articulated with the both ends of bottom end rail respectively, the top links to each other with the both ends of entablature respectively, the vertical setting on the entablature of dowel steel, the below of dowel steel be equipped with the pressure transmission board.
Further, the measurement and control unit include Z to displacement sensor, first laser displacement sensor, second laser displacement sensor and two-way acceleration sensor, two-way acceleration sensor set up in the tray side, first laser displacement sensor and second laser displacement sensor set up respectively on the test bench, the test bench on be equipped with the holding frame, Z to displacement sensor set up on the holding frame.
Furthermore, the measurement and control unit further comprises a dynamic signal testing analyzer which is respectively and electrically connected with the Z-direction displacement sensor, the first laser displacement sensor, the second laser displacement sensor and the bidirectional acceleration sensor. The first dynamic force sensor, the second dynamic force sensor and the Z-direction force sensor are also electrically connected with the dynamic signal testing analyzer respectively.
Furthermore, the measurement and control unit further comprises a computer and a servo driver, and the computer is respectively and electrically connected with the servo driver and the dynamic signal testing analyzer.
Compared with the prior art, the invention has the following characteristics:
1) the invention innovatively introduces the voice coil motor which is a special direct drive motor in the field of geotechnical test instruments, and combines the mode of coaxial loading of the stepping motor and the voice coil motor module, thereby solving the technical problem that the traditional contact surface shearing instrument cannot realize high-frequency vibration combined static shearing, and realizing the loading effect of arbitrary switching of vibration frequency, amplitude and waveform.
2) According to the invention, the double-slide-rail motion platform is introduced into the contact surface shearing test device, and the two linear slide rails are combined, so that the technical effect of bidirectional high-frequency vibration combined static shearing synchronous loading is realized.
3) The invention adopts a special upper shearing box (the width of the upper shearing box in the Y direction is larger than the width of the structural panel and the tray in the Y direction, and the upper shearing box is provided with a through hole matched with the supporting column), and is combined with an upper shearing box fixing mechanism, so that the upper shearing box is prevented from being directly contacted with the structural panel, the influence of the friction between the upper shearing box and the structural panel on a test result is avoided, and simultaneously, a loading mode that static shearing and high-frequency vibration are applied to a soil-structure contact surface through a structural surface is realized, and the stress condition of the contact surface is more consistent with that in actual engineering.
4) According to the invention, a vertical air pressure loading technology is introduced into the high-frequency vibration contact surface shear test device, so that the technical problem of normal pressure fluctuation of a contact surface caused by high inertia force caused by high-frequency vibration is avoided, and the effect of constant vertical pressure output in the high-frequency vibration process is achieved.
5) The invention integrates a dynamic force sensor, a laser displacement sensor and an acceleration sensor which are adaptive to the acquisition of corresponding physical and mechanical quantities under high-frequency vibration, and accesses a computer through a high-frequency acquisition instrument, thereby realizing the high-speed, automatic and synchronous acquisition of vertical displacement, horizontal bidirectional tangential force, bidirectional tangential displacement and bidirectional vibration acceleration of a sample.
Drawings
FIG. 1 is a schematic front view of a shear test apparatus in example 1;
FIG. 2 is a schematic left side view of the shear test apparatus in example 1;
FIG. 3 is a schematic top view showing the structure of the shear test apparatus in example 1;
FIG. 4 is a schematic diagram showing the structure of the sample and its peripheral parts in example 1 in a right view;
FIG. 5 is a schematic top view showing the structure of a tray and its peripheral parts in example 1;
the notation in the figure is:
1-a test bed, 2-an upper shear box, 3-an upper shear box fixing mechanism, 4-a pressure transmission plate, 5-a structural panel, 6-a tray, 7-a double-slide rail motion platform, 8-a first voice coil motor module, 9-a first stepping motor, 10-a first single-slide rail motion platform, 11-a second voice coil motor module, 12-a second stepping motor, 13-a second single-slide rail motion platform, 14-a servo driver, 15-a first linear slide rail, 16-a second linear slide rail, 17-an air compressor, 18-an electro-hydraulic servo valve, 19-an air cylinder, 20-a lower cross beam, 21-a first upright column, 22-a second upright column, 23-an upper cross beam, 24-a force transmission rod, 25-a Z displacement sensor, 26-a first laser displacement sensor, 27-a second laser displacement sensor, 28-a two-way sensor, 29-a first dynamic force sensor, 30-a second dynamic force sensor, 31-Z direction force transducer, 32-dynamic signal test analyzer, 33-computer, 34-signal line, 35-first connecting piece, 36-second connecting piece, 37-clamping frame.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
Example 1:
as shown in fig. 1, fig. 2, fig. 3, fig. 4, and fig. 5, a soil-structure contact surface shear test device capable of realizing bidirectional high-frequency vibration includes a test unit, a loading unit (for horizontal loading and Z-loading) and a measurement and control unit (for measurement acquisition and control). The related components mainly include: the test bed 1, the upper shear box 2, the upper shear box fixing mechanism 3, the pressure transmission plate 4, the structural panel 5, the tray 6, the double-slide rail motion platform 7, the first voice coil motor module 8, the first stepping motor 9, the first single-slide rail motion platform 10, the second voice coil motor module 11, the second stepping motor 12, the second single-slide rail motion platform 13, the servo driver 14, the first linear slide rail 15, the second linear slide rail 16, the air compressor 17, the electro-hydraulic servo valve 18, the cylinder 19, the lower cross beam 20, the first upright post 21, the second upright post 22, the upper cross beam 23, the force transmission rod 24, the Z-direction displacement sensor 25, the first laser displacement sensor 26, the second laser displacement sensor 27, the bidirectional acceleration sensor 28, the first dynamic force sensor 29, the second dynamic force sensor 30, the Z-direction force sensor 31, the dynamic signal test analyzer 32, the computer 33, the signal line 34, the second laser displacement sensor 27, the bidirectional acceleration sensor 28, the first dynamic force sensor, A first connector 35, a second connector 36, a holder 37.
As shown in fig. 1, 2, 3 and 4, in the present embodiment, the upper shear box fixing mechanism 3 is composed of four small support columns with threads and 4 pairs of 8 bolts, and four through holes are formed in the upper shear box 2; the four small support columns are fixed on the test bed 1 and penetrate through the four through holes in the upper shearing box 2, and each pair of bolts is respectively arranged on the top surface and the bottom surface of the upper shearing box 2 and used for limiting the spatial position of the upper shearing box 2; the width of the upper shear box 2 in the Y direction is greater than the width of the structural panel 5 and tray 6 in the Y direction, and the excess allows the small support posts to pass through. This connection avoids the direct contact between the upper shear box 2 and the structural panel 5, and also achieves flexible adjustment of the size of the slit between the upper shear box 2 and the structural panel 5.
Referring to fig. 1, 2 and 4, in the present embodiment, the structural panel 5 is fixed on the tray 6 by bolts, and the two are detachably connected; the tray 6 is fixed on the double-sliding-rail moving platform 7 through bolts, and the double-sliding-rail moving platform 7 is fixed on the test bed 1 through bolts; the double-slide rail motion platform 7 allows the connected components on the platform to generate low-friction and high-speed motion along any direction of an XY plane. This connection enables a degree of freedom of the construction panel 5 in the XY-plane while limiting the degree of freedom of the construction panel 5 in the Z-direction.
As shown in fig. 1, 2, and 3, in this embodiment, a first stepping motor 9 is fixed on a test bed 1 by bolts, a first voice coil motor module 8 is connected with the first stepping motor 9 by bolts and coaxially disposed, the first voice coil motor module 8 is fixed on a first single-sliding-rail motion platform 10 by bolts, and the first single-sliding-rail motion platform 10 is fixed on the test bed 1 by bolts; the second stepping motor 12 is fixed on the test bed 1 through bolts, the second voice coil motor module 11 and the second stepping motor 12 are connected through bolts and coaxially arranged, the second voice coil motor module 11 is fixed on the second single-slide-rail motion platform 13 through bolts, and the second single-slide-rail motion platform 13 is fixed on the test bed 1 through bolts; the first single-slide motion stage 10 and the second single-slide motion stage 13 allow low-friction, high-linearity relative motion of the components connected thereto in the X and Y directions, respectively. The connection mode realizes that the stepping motor and the voice coil motor module are coaxial and synchronously apply static shear load and high-frequency vibration.
As shown in fig. 1, fig. 2, fig. 3, and fig. 5, in the present embodiment, the first linear sliding rail 15 is fixed to the tray 6 by a bolt, the first connecting member 35 is connected to the first linear sliding rail 15 by a bolt, and the first linear sliding rail 15 is installed between the tray 6 and the first connecting member 35 and has a sliding direction in the Y direction; one end of the first dynamic force sensor 29 is fixed to the first voice coil motor module 8 through a bolt, and the other end of the first dynamic force sensor is detachably connected with the first connecting piece 35 through a pin connection mode; the second linear sliding rail 16 is fixed on the tray 6 through a bolt, the second connecting piece 36 is connected with the second linear sliding rail 16 through a bolt, the second linear sliding rail 16 is installed between the tray 6 and the second connecting piece 36, and the sliding direction is the X direction; one end of the second dynamic force sensor 30 is fixed to the second voice coil motor module 11 through a bolt, and the other end is detachably connected to the second connecting piece 36 through a pin connection manner; the first linear slide 15 and the second linear slide 16 allow low friction, high speed, high linear relative motion of the components connected thereto in the Y and X directions, respectively. This connection ensures that the X and Y loading mechanisms are independent of each other, and allows the tray 6 and the structural panel 5 to move in the direction X, Y simultaneously.
Referring to fig. 1, 2 and 4, in the present embodiment, the air compressor 17 is connected to the electrohydraulic servo valve 18 through a pipeline, and the electrohydraulic servo valve 18 is connected to the cylinder 19 through a pipeline; one end of the cylinder 19 is connected with the Z-direction force sensor 31 through a bolt, the other end of the cylinder is connected with the lower cross beam 20 through a bolt, and the Z-direction force sensor 31 is fixed on the bottom surface of the test bed 1 through a bolt; the bottoms of the first upright post 21 and the second upright post 22 are respectively connected with two ends of the lower cross beam 20 through hinges, and the tops of the first upright post and the second upright post are respectively connected with two ends of the upper cross beam 23 through bolts; the middle part of the upper cross beam 23 is provided with a dowel bar 24, and the dowel bar 24 is coaxial with the pressure transmission plate 4. The connection mode converts the air pressure generated by the air compressor 17 into the vertical pressure borne by the sample, and the problem of normal pressure fluctuation of the contact surface caused by high inertia force due to high-frequency vibration is avoided by utilizing the advantages of quick air pressure transmission action and small inertia.
As shown in fig. 1, 2, and 3, in the present embodiment, the bidirectional acceleration sensor 28 is fixed to the side surface of the tray 6 by bolts and points to X, Y direction, the first laser displacement sensor 26 is fixed to the test bed 1 by bolts and points to the tray 6 in X direction, the second laser displacement sensor 27 is fixed to the test bed 1 by bolts and points to the tray 6 in Y direction, the Z-displacement sensor 25 is fixed to the clamping frame 37 by bolts and points to the force-transmitting rod 24, the Z-force sensor 31 is fixed to the bottom surface of the test bed 1 by bolts, the first dynamic force sensor 29 is fixed to the first voice coil motor module 8 by bolts and is coaxial with the first voice coil motor module 8, and the second dynamic force sensor 30 is fixed to the second voice coil motor module 11 by bolts and is coaxial with the second voice coil motor module 11. This connection enables force, displacement in the direction of contact surface X, Y, Z, and vibration acceleration acquisition in the direction X, Y.
As shown in fig. 1, 2, and 3, in this embodiment, the first voice coil motor module 8 and the second voice coil motor module 11 are connected to the servo driver 14 through a signal line 34, the servo driver 14 is connected to the computer 33 through the signal line 34, and the first stepping motor 9 and the second stepping motor 12 are connected to the computer 33 through the signal line 34; the Z-direction displacement sensor 25, the first laser displacement sensor 26, the second laser displacement sensor 27, the bidirectional acceleration sensor 28, the first dynamic force sensor 29, the second dynamic force sensor 30 and the Z-direction force sensor 31 are all connected to a dynamic signal testing analyzer 32 through signal lines 34, and the dynamic signal testing analyzer 32 is connected with a computer 33 through the signal lines 34. The connection mode realizes the intelligent control of the motion of the stepping motor and the voice coil motor, and the high-precision, real-time and synchronous acquisition of corresponding physical and mechanical quantities, thereby integrally improving the intelligent level of the device.
The test device of the present embodiment is used in the following way with reference to the attached drawings:
1. assembling and preparing a sample: securing the structural panel 5 to the tray 6 by bolts; adjusting the size of a seam between the upper shearing box 2 and the structural panel 5 through the upper shearing box fixing mechanism 3, wherein the size of the seam is determined according to the size of a discrete material used in the test; fixing the relative positions of the upper shearing box 2 and the structural panel 5 on the XY surface by using a positioning pin; putting the sample with determined quality into the upper shear box 2, and putting the pressure transmission plate 4 above the sample.
2. Adjusting a tangential loading mechanism and a measurement acquisition system: firstly, a computer 33 gives an instruction to a dynamic signal testing analyzer 32 to start the first dynamic force sensor 29 and the second dynamic force sensor 30; a driving instruction is sent to the first stepping motor 9 through the computer 33, so that the first voice coil motor module 8 is pushed at a low speed, the pushing speed is 0.5mm/min in the embodiment, when the first dynamic force sensor 29 collects contact force, the contact pressure is controlled not to exceed 5N in the embodiment, the computer 33 sends an instruction to stop the first stepping motor 9, and the relative positions of the first connecting piece 35 and the first dynamic force sensor 29 are locked through pin connection; pushing a second voice coil motor module 11 through a second stepping motor 12 by adopting a method consistent with the step II, observing data of a second dynamic force sensor 30, enabling all parts of the tangential loading mechanism in the Y direction to be in close contact, and locking the relative positions of a second connecting piece 36 and the second dynamic force sensor 30 through pin connection; and sending an instruction to the dynamic signal testing analyzer 32 by the computer 33 to start collecting data of the first laser displacement sensor 26, the second laser displacement sensor 27 and the bidirectional acceleration sensor 28.
Adjusting a Z-direction loading mechanism and a measurement acquisition system: firstly, issuing an instruction to the dynamic signal testing analyzer 32 by the computer 33 to start collecting data of the Z-direction force sensor 31; controlling the air compressor 17 to release air pressure, and collecting a vertical contact force through the Z-direction force sensor 31, wherein the initial vertical contact force is controlled not to exceed 5N in the embodiment; thirdly, sending an instruction to the dynamic signal testing analyzer 32 by the computer 33 to start collecting data of the Z-direction displacement sensor 25; and fourthly, observing the data of the Z-direction force sensor 31, controlling the air compressor 17 and the electro-hydraulic servo valve 18 to enable the output force of the air cylinder 19 to reach a required value, and simultaneously judging whether the sample completes main consolidation or not by combining the data of the Z-direction displacement sensor 25.
4. Tangential loading: firstly, after the sample is mainly solidified, pulling out a positioning pin from the upper shearing box 2; secondly, a command is sent to the first stepping motor 9 through the computer 33, so that the first voice coil motor module 8 is pushed at a set speed, and the static shear rate is set to be 0.1mm/min in the embodiment; when the step II is started, according to the simulated actual working condition, a command is given to the servo driver 14 through the computer 33 to drive the first voice coil motor module 8 and the second voice coil motor module 11 to work simultaneously or independently, the example simulates the mechanical behavior of the pile-soil contact surface under bidirectional vibration, the first voice coil motor module 8 and the second voice coil motor module 11 are selected to work simultaneously, according to the simulated actual working condition, vibration with different amplitudes, different frequencies, different duration and different waveforms can be selected, and sine waves with the amplitude of 10 mu m and the frequency of 80Hz are applied in the embodiment; and fourthly, judging whether the sample reaches shearing failure or not by combining the monitoring data of the first laser displacement sensor 26 and the first dynamic force sensor 29.
5. Unloading and post-processing: when the sample reaches a destruction standard, a computer 33 issues a command to a servo driver 14 to control a first voice coil motor module 8 and a second voice coil motor module 11 to stop vibrating; controlling the air compressor 17 and the electro-hydraulic servo valve 18 to eliminate the normal force of the sample; thirdly, the pin connection between the first connecting piece 35 and the first dynamic force sensor 29 is released, and the pin connection between the second connecting piece 36 and the second dynamic force sensor 30 is released; fourthly, the computer 33 controls the first stepping motor 9 and the second stepping motor 12 to retract, so that all parts of the tangential loading mechanism return. And fifthly, performing test data arrangement according to the data of each sensor recorded by the computer 33.
Example 2:
as shown in fig. 1, fig. 2, fig. 3, fig. 4, and fig. 5, a soil-structure contact surface shear test device capable of realizing bidirectional high-frequency vibration includes a test unit, a loading unit, and a measurement and control unit, where the test unit includes a test bed 1, an upper shear box fixing mechanism 3 disposed on the test bed 1, an upper shear box 2 disposed on the upper shear box fixing mechanism 3, a dual-slide rail motion platform 7 disposed on the test bed 1, a tray 6 disposed on the dual-slide rail motion platform 7, and a structural panel 5 disposed on the tray 6 and below the upper shear box 2, the loading unit includes an X-direction voice coil motor loading mechanism, a Y-direction voice coil motor loading mechanism, and a Z-direction loading mechanism adapted to the upper shear box 2, and the measurement and control unit is adapted to the test unit and the loading unit respectively.
Wherein, go up shear box fixed establishment 3 and include a plurality of vertical settings and fix the support column on test bench 1, all overlap on every support column and be equipped with a pair of bolt, go up shear box 2 on offer with the through-hole of support column looks adaptation, the support column passes corresponding through-hole, a pair of bolt on every support column is blocked respectively and is established top, the bottom of last shear box 2. The width of the upper shear box 2 in the Y direction is greater than the width of the structural panel 5 and tray 6 in the Y direction.
X includes first voice coil motor module 8 to voice coil motor loading mechanism, first step motor 9, first single slide rail motion platform 10, first linear slide rail 15 and first connecting piece 35, first step motor 9 and first single slide rail motion platform 10 are fixed respectively and are set up on test bench 1, first voice coil motor module 8 sets up on first single slide rail motion platform 10, first linear slide rail 15 sets up in 6 sides of tray, the one end of first voice coil motor module 8 links to each other with first step motor 9, the other end links to each other with first linear slide rail 15 through first connecting piece 35.
Y is to voice coil motor loading mechanism including second voice coil motor module 11, second step motor 12, the single slide rail motion platform 13 of second, second linear slide rail 16 and second connecting piece 36, second step motor 12 and the single slide rail motion platform 13 of second are fixed the setting respectively on test bench 1, second voice coil motor module 11 sets up on the single slide rail motion platform 13 of second, second linear slide rail 16 sets up in tray 6 side, the one end of second voice coil motor module 11 links to each other with second step motor 12, the other end passes through second connecting piece 36 and links to each other with second linear slide rail 16.
The measurement and control unit comprises a first dynamic force sensor 29 and a second dynamic force sensor 30, the first dynamic force sensor 29 is located between the first voice coil motor module 8 and the first connecting piece 35, and the second dynamic force sensor 30 is located between the second voice coil motor module 11 and the second connecting piece 36.
The Z-direction loading mechanism comprises an air compressor 17, an electro-hydraulic servo valve 18, an air cylinder 19, a lower cross beam 20, a first upright post 21, a second upright post 22, an upper cross beam 23 and a force transfer rod 24, the measurement and control unit comprises a Z-direction force sensor 31 arranged on the bottom surface of the test bed 1, the air compressor 17, the electro-hydraulic servo valve 18 and the air cylinder 19 are sequentially communicated, the top end of the air cylinder 19 is connected with the Z-direction force sensor 31, the bottom end of the air cylinder is connected with the lower cross beam 20, the bottoms of the first upright post 21 and the second upright post 22 are respectively hinged with two ends of the lower cross beam 20, the tops of the first upright post 21 and the second upright post 22 are respectively connected with two ends of the upper cross beam 23, the force transfer rod 24 is vertically.
The measurement and control unit comprises a Z-direction displacement sensor 25, a first laser displacement sensor 26, a second laser displacement sensor 27 and a bidirectional acceleration sensor 28, the bidirectional acceleration sensor 28 is arranged on the side face of the tray 6, the first laser displacement sensor 26 and the second laser displacement sensor 27 are respectively arranged on the test bed 1, a clamping frame 37 is arranged on the test bed 1, and the Z-direction displacement sensor 25 is arranged on the clamping frame 37 and is positioned above the dowel bar 24.
The measurement and control unit further comprises a dynamic signal testing analyzer 32, and the dynamic signal testing analyzer 32 is electrically connected with the Z-direction displacement sensor 25, the first laser displacement sensor 26, the second laser displacement sensor 27 and the bidirectional acceleration sensor 28 respectively. The measurement and control unit further comprises a computer 33 and a servo driver 14, wherein the computer 33 is electrically connected with the servo driver 14 and the dynamic signal testing analyzer 32 respectively.
The embodiments described above are described to facilitate an understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (10)
1. The utility model provides a can realize soil-structure contact surface shear test device of two-way high frequency vibration, a serial communication port, the device includes test unit, loading unit and measurement and control unit, test unit include test bench (1), set up on test bench (1) cut box fixed establishment (3), set up on last cut box fixed establishment (3) cut box (2), set up two slide rail motion platform (7) on test bench (1), set up tray (6) on two slide rail motion platform (7) and set up on tray (6) and lie in structure panel (5) of last shear box (2) below, loading unit include respectively with tray (6) looks adaptation X to voice coil motor loading mechanism, Y to voice coil motor loading mechanism and with the Z of last shear box (2) looks adaptation to the loading mechanism, the measurement and control unit respectively with test unit, The loading unit is adapted.
2. The soil-structure contact surface shear test device capable of realizing bidirectional high-frequency vibration according to claim 1, wherein the upper shear box fixing mechanism (3) comprises a plurality of supporting columns which are vertically arranged and fixed on the test bed (1), each supporting column is sleeved with a pair of bolts, the upper shear box (2) is provided with through holes matched with the supporting columns, the supporting columns penetrate through the corresponding through holes, and the pair of bolts on each supporting column are respectively clamped at the top end and the bottom end of the upper shear box (2).
3. The soil-structure contact surface shear test device capable of realizing bidirectional high-frequency vibration according to claim 1, wherein the width of the upper shear box (2) in the Y direction is larger than the widths of the structure panel (5) and the tray (6) in the Y direction.
4. The soil-structure contact surface shear test device capable of realizing bidirectional high-frequency vibration according to claim 1, it is characterized in that the X-direction voice coil motor loading mechanism comprises a first voice coil motor module (8), a first stepping motor (9), a first single-slide-rail motion platform (10), a first linear slide rail (15) and a first connecting piece (35), the first stepping motor (9) and the first single-slide-rail moving platform (10) are respectively and fixedly arranged on the test bed (1), the first voice coil motor module (8) is arranged on the first single-slide-rail motion platform (10), first linear slide rail (15) set up in tray (6) side, the one end of first voice coil motor module (8) link to each other with first step motor (9), the other end passes through first connecting piece (35) and links to each other with first linear slide rail (15).
5. The soil-structure contact surface shear test device capable of realizing bidirectional high-frequency vibration according to claim 4, it is characterized in that the Y-direction voice coil motor loading mechanism comprises a second voice coil motor module (11), a second stepping motor (12), a second single-slide-rail motion platform (13), a second linear slide rail (16) and a second connecting piece (36), the second stepping motor (12) and the second single-slide-rail moving platform (13) are respectively and fixedly arranged on the test bed (1), the second voice coil motor module (11) is arranged on a second single-slide-rail motion platform (13), the second linear sliding rail (16) is arranged on the side face of the tray (6), one end of the second voice coil motor module (11) is connected with the second stepping motor (12), and the other end of the second voice coil motor module is connected with the second linear sliding rail (16) through a second connecting piece (36).
6. The soil-structure contact surface shear test device capable of realizing bidirectional high-frequency vibration according to claim 5, wherein the measurement and control unit comprises a first dynamic force sensor (29) and a second dynamic force sensor (30), the first dynamic force sensor (29) is located between the first voice coil motor module (8) and the first connecting piece (35), and the second dynamic force sensor (30) is located between the second voice coil motor module (11) and the second connecting piece (36).
7. The soil-structure contact surface shear test device capable of realizing bidirectional high-frequency vibration according to claim 1, wherein the Z-direction loading mechanism comprises an air compressor (17), an electro-hydraulic servo valve (18), an air cylinder (19), a lower cross beam (20), a first upright post (21), a second upright post (22), an upper cross beam (23) and a dowel bar (24), the measurement and control unit comprises a Z-direction force sensor (31) arranged on the bottom surface of the test bed (1), the air compressor (17), the electro-hydraulic servo valve (18) and the air cylinder (19) are sequentially communicated, the top end of the air cylinder (19) is connected with the Z-direction force sensor (31), the bottom end of the air cylinder is connected with the lower cross beam (20), the bottom ends of the first upright post (21) and the second upright post (22) are respectively hinged with two ends of the lower cross beam (20), and the top ends of the first upright post and the second upright post are respectively connected with two ends of the upper cross beam (23), the dowel bar (24) is vertically arranged on the upper cross beam (23), and a pressure transmission plate (4) is arranged below the dowel bar (24).
8. The soil-structure contact surface shear test device capable of realizing bidirectional high-frequency vibration according to claim 1, wherein the measurement and control unit comprises a Z-direction displacement sensor (25), a first laser displacement sensor (26), a second laser displacement sensor (27) and a bidirectional acceleration sensor (28), the bidirectional acceleration sensor (28) is arranged on the side surface of the tray (6), the first laser displacement sensor (26) and the second laser displacement sensor (27) are respectively arranged on the test bed (1), the test bed (1) is provided with a clamping frame (37), and the Z-direction displacement sensor (25) is arranged on the clamping frame (37).
9. The soil-structure contact surface shear test device capable of realizing bidirectional high-frequency vibration according to claim 8, wherein the measurement and control unit further comprises a dynamic signal test analyzer (32), and the dynamic signal test analyzer (32) is electrically connected with the Z-direction displacement sensor (25), the first laser displacement sensor (26), the second laser displacement sensor (27) and the bidirectional acceleration sensor (28), respectively.
10. The soil-structure contact surface shear test device capable of realizing bidirectional high-frequency vibration according to claim 9, wherein the measurement and control unit further comprises a computer (33) and a servo driver (14), and the computer (33) is electrically connected with the servo driver (14) and the dynamic signal testing analyzer (32) respectively.
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