CN114354388B - Soil body structure concrete dynamic shear creep experimental apparatus - Google Patents
Soil body structure concrete dynamic shear creep experimental apparatus Download PDFInfo
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- CN114354388B CN114354388B CN202111554391.8A CN202111554391A CN114354388B CN 114354388 B CN114354388 B CN 114354388B CN 202111554391 A CN202111554391 A CN 202111554391A CN 114354388 B CN114354388 B CN 114354388B
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Abstract
The invention discloses a soil structure concrete dynamic shear creep experiment device, which comprises a base, a control box, an experiment frame, a direct shear mechanism and a radial shear mechanism, wherein the control box, the experiment frame, the direct shear mechanism and the radial shear mechanism are arranged on the base; the device can realize direct shear and radial shear of a test piece through the direct shear mechanism and the radial shear mechanism, so that multidirectional and angular dynamic shear creep test can be carried out on the soil structure concrete, and the dynamic shear strength deformation and shear modulus of the soil structure concrete are measured.
Description
Technical Field
The invention relates to the technical field of structural concrete shearing equipment, in particular to a soil mass structural concrete dynamic shearing creep experiment device.
Background
The concrete is widely applied to the fields of construction, water conservancy, traffic, national defense and the like as an engineering material with the maximum use amount and the widest use range, so the mechanical property of the concrete is related to the bearing capacity and stability of the building; in construction mechanics and engineering, concrete is divided into damage forms such as pulling, pressing, bending and the like according to stress forms, and the standards GB50010-2010 and concrete structural design standards [ S ] correspondingly provide tensile strength, compressive strength, bending strength and the like of the concrete; however, in the widely used elastoplastics, the damage of the solid material is only tensile damage and shear damage, so that the tensile strength and the shear strength of the material are paid great attention to in engineering;
the machine used in laboratory experiments to shear concrete blocks is typically a YZW100 microcomputer controlled electric stress direct shear apparatus, comprising normal and shear direction loading equipment. The instrument is developed according to the regulations of national standards of highway engineering rock test procedure (JTGF 41-2005) and water conservancy and hydropower engineering rock test procedure (SL 264-2001), and is suitable for direct shear tests of rock structural surfaces (such as joint surfaces, layer inner surfaces, sheet inner surfaces, splitting surfaces and the like), rock and concrete or mortar and rock cementing surfaces and shear strength tests of concrete and other material bonding surfaces; the structural performance of the steel plate completely meets the requirements of test specifications;
the prior shearing experiment for the concrete block test piece comprises the following steps: firstly, the concrete block test piece is fixed on the upper half part of the concrete block test piece after four iron plates are surrounded into an iron frame through a plurality of nuts and double-headed screws, two iron plates are fixed on the lower half part of the concrete block test piece in the same mode, and the upper iron frame and the lower iron frame respectively act on two horizontal jacks. Installing a concrete test piece according to the requirements, then loading the concrete test piece into a shearing instrument, applying normal load to the block, and gradually increasing the shearing stress on the shearing surface until the test piece is damaged; the process of fixing the concrete blocks by the iron frame is complex, the concrete test piece is inconvenient to assemble and disassemble, the test of the concrete test piece with various specifications is not facilitated, and the iron frame can only perform direct shear experiments, has single action and does not meet the experimental needs of multiple shearing position requirements.
Disclosure of Invention
Aiming at the problems, the invention aims to provide a dynamic shear creep experiment device for soil structural concrete, which can realize direct shear and radial shear of a test piece through a direct shear mechanism and a radial shear mechanism, so that multi-azimuth and angular dynamic shear creep test can be carried out on the soil structural concrete, and the dynamic shear strength deformation and shear modulus of the soil structural concrete can be measured.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the dynamic shear creep experiment device for the soil structure concrete comprises a base, a control box, an experiment frame, a direct shear mechanism and a radial shear mechanism, wherein the control box, the experiment frame, the direct shear mechanism and the radial shear mechanism are arranged on the base;
the experiment frame comprises an upper beam frame, a carrying disc, a first hydraulic cylinder and a guide rod, wherein the carrying disc is arranged on a test bed of a base through a steering adjusting mechanism, an objective table is arranged on the carrying disc, the first hydraulic cylinders are symmetrically arranged on the test bed, the top of piston rods of the first hydraulic cylinders are connected with the upper beam frame, the guide rod is arranged on the inner side of the first hydraulic cylinders, lifting rings are arranged at the tail ends of the guide rod, a direct shearing mechanism is arranged on the upper beam frame, and the radial shearing mechanism is symmetrically arranged on the test bed.
Preferably, the direct shear mechanism comprises a second direct shear hydraulic cylinder and a direct shear disc, wherein the second direct shear hydraulic cylinder is arranged on the upper beam frame through a mounting assembly and is connected with the direct shear disc, and a first direct shear displacement sensor is arranged at the center of the direct shear disc.
Preferably, the installation component comprises a first hydraulic cylinder limiting cylinder, a second hydraulic cylinder limiting cylinder, a first connecting rod and a telescopic sleeve, wherein the first hydraulic cylinder limiting cylinder is arranged on the second hydraulic cylinder limiting cylinder, the first connecting rod and the telescopic sleeve are arranged on the outer sides of the first hydraulic cylinder limiting cylinder and the second hydraulic cylinder limiting cylinder through connecting arms, and the first connecting rod is matched with the telescopic sleeve; the telescopic sleeve is characterized in that the outer side of the telescopic sleeve is rotatably provided with a self-locking block through a hinge pin, the front end of the self-locking block is provided with a first helical tooth, and the first helical tooth is matched with a second helical tooth arranged on a first connecting rod.
Preferably, the radial shearing mechanism comprises an inclined support, an L-shaped mounting frame, a third jacking cylinder, a fourth radial shearing cylinder, a radial shearing disc and a second radial shearing displacement sensor, wherein the inclined support is arranged on the base, a sliding groove is formed in the inner side of the inclined support, the sliding groove is matched with a sliding guide block arranged on the mounting frame for use, the third jacking cylinder is arranged between the mounting frame and the base, the fourth radial shearing cylinder is arranged on the mounting frame and connected with the radial shearing disc, and the second radial shearing displacement sensor is arranged at the center of the radial shearing disc and is matched with a test piece for use through a shearing ring.
Preferably, the shearing ring is composed of a plurality of shearing units with the same structure, the shearing units comprise an outer ring arc and an inner ring arc, the outer ring arc is arranged outside the inner ring arc and is connected with the inner ring arc through a connecting assembly, an arc groove and an arc plate are arranged on the outer ring arc, the arc groove between two adjacent outer ring arcs is matched with the arc plate for use, and a limiting round hole is arranged on the outer ring arc and is matched with the horizontal deformation sensor for use; and a latex film is further arranged on the inner side of the inner circular arc, and the latex film is matched with the test piece for use.
Preferably, the connecting assembly comprises an adjusting part and a reinforcing part, wherein the adjusting part is arranged at the upper end and the lower end of the reinforcing part and comprises a bolt piece and a first screw-connection column, the bolt piece is in threaded connection with the outer ring arc, and a screw-connection hole is formed in the bolt piece and is in threaded connection with the first screw-connection column; the reinforcing part comprises a reinforcing connecting piece and a second screw-connection column, the first screw-connection column is arranged on the second screw-connection column, the second screw-connection column is in threaded connection with the reinforcing connecting piece, a spherical pressure head is further arranged on the reinforcing connecting piece, and the spherical pressure head is matched with an outer ring arc for use.
Preferably, the steering adjusting mechanism comprises a first bearing, a first gear, a second gear and an adjusting piece, wherein a limit column is arranged on the test bed, the carrying disc is connected with the limit column through the first bearing, the first gear is arranged on the outer side of the carrying disc and meshed with the second gear, the second gear is arranged on an adjusting rod of the adjusting piece, an adjusting button is arranged on the adjusting rod, and the lower end of the adjusting rod is rotationally connected with a positioning sleeve arranged on the test bed through a second bearing; still be provided with the draw-in groove on the objective table, the draw-in groove uses with the cooperation of the second test piece cover that sets up at the test piece lower extreme.
Preferably, the base on still be provided with the removal wheel through removing wheel elevating system, remove wheel elevating system includes fifth lift cylinder, guided way, slider and removes the wheel connecting piece, the guided way sets up on the base, fifth lift cylinder is fixed between two guided ways, and fifth lift cylinder is connected with the slider, remove the wheel connecting piece setting and be connected at the lower extreme of slider, and with removing the wheel.
Preferably, the base on still be provided with positioning mechanism through the articulated slab, positioning mechanism includes the rotating arm, rotates connecting piece, stabilizer blade pole and stabilizer blade dish, it is connected with the articulated slab through first fixed locating pin to rotate the connecting piece, the one end of rotating the arm is connected with rotating the connecting piece through the fixed locating pin of second, and is provided with the screw thread loop bar at the other end of rotating the arm, screw thread loop bar and stabilizer blade pole threaded connection, and be provided with the regulation handle in the upper end of stabilizer blade pole, the stabilizer blade dish sets up the lower extreme at the stabilizer blade pole, and is connected with the stabilizer blade pole.
Preferably, the first fixed locating pin is a hollow locating pin, the first fixed locating pin is a polygonal cavity, and the first fixed locating pin is matched with the locking pin for use to lock the rotation angle of the rotation connecting piece.
The beneficial effects of the invention are as follows: the invention discloses a soil mass structure concrete dynamic shear creep experiment device, which is improved compared with the prior art in that:
(1) The invention designs a dynamic shear creep experiment device for a concrete with a soil structure, which comprises an experiment frame, a direct shear mechanism and a radial shear mechanism, wherein the direct shear mechanism and the radial shear mechanism are arranged on the experiment frame; meanwhile, the action of a fourth radial shear cylinder of the radial shear mechanism is controlled to measure the dynamic shear strength deformation and shear modulus of the concrete test piece with the same soil body structure under the action of different horizontal shear forces, so that the shear strength coefficient, the internal friction angle and the cohesive force are determined according to the coulomb law; has the advantages of diversified functions and simplified use process;
(2) The device is provided with the movable wheel lifting mechanism and the positioning mechanism on the base, and is convenient to move and position the device when in use, convenient to use and convenient for the movement of the device.
Drawings
FIG. 1 is a schematic structural diagram of a soil structure concrete dynamic shear creep experiment device of the invention.
FIG. 2 is a schematic structural view of the experimental frame of the present invention.
Fig. 3 is a side view of the experimental bench of the invention.
Fig. 4 is a schematic structural view of the steering adjustment mechanism of the present invention.
Fig. 5 is a cross-sectional view of the steering adjustment mechanism of the present invention from a top view.
Fig. 6 is a cross-sectional view of the steering adjustment mechanism of the present invention from the front view.
FIG. 7 is a schematic view of the structure of the inclined support of the present invention.
Fig. 8 is a schematic structural view of the mounting frame of the present invention.
FIG. 9 is a schematic view of a mounting assembly according to the present invention
Fig. 10 is a cross-sectional view of the telescopic sleeve of the present invention.
Fig. 11 is an enlarged view of a portion of the mounting assembly B of the present invention.
Fig. 12 is a partial schematic view of the present invention at the moving wheel lifting mechanism a.
Fig. 13 is a schematic structural view of the positioning mechanism of the present invention.
Fig. 14 is an exploded view of the positioning mechanism of the present invention.
FIG. 15 is a schematic view of the structure of the shear ring of the present invention.
FIG. 16 is a cross-sectional view of the shear ring installation of the present invention.
Wherein: 1. base, 11, hinge plate, 2, control box, 3, positioning mechanism, 31, pivot arm, 32, pivot connection, 33, first fixed locating pin, 34, second fixed locating pin, 35, foot bar, 36, threaded sleeve bar, 37, locating plate, 38, foot plate, 39, locking pin, 4, mobile wheel lifting mechanism, 41, slider, 42, fifth lifting cylinder, 43, slider, 44, mobile wheel connection, 5, mobile wheel, 6, laboratory stand, 61, upper beam, 62, load plate, 621, first bearing, 622, first gear, 63, stage, 631, clamping groove, 632, stop post, 64, first hydraulic cylinder, 65, guide bar, 66, mounting assembly, 661, first hydraulic cylinder stop cylinder, 662, second hydraulic cylinder stop cylinder, 663, connecting arm 664, first connecting rod, 6641, second helical tooth, 665, telescopic sleeve, 666, 667. Self-locking block, 6671. First helical tooth, 668. Hinge pin, 67. Eye, 68. Adjustment member, 681. Second gear, 682. Second bearing, 683. Positioning sleeve, 684. Adjustment rod, 69. Test stand, 7. Direct shear mechanism, 71. Second direct shear hydraulic cylinder, 72. Direct shear disk, 73. First direct shear displacement sensor, 8. Radial shear mechanism, 81. Diagonal support, 811. Chute, 82. Mounting bracket, 821. Sliding guide block, 83. Third lift cylinder, 84. Fourth radial shear cylinder, 85. Radial shear disk, 86. Second radial shear displacement sensor, 9. Test piece, 91. First test piece sleeve, 92. Second test piece sleeve, 93. Shear ring, 931. Outer ring arc, 932. Inner ring arc, 933. Arc groove, 934 arc plate, 935. Fixing bolt, 936. Limit orifice, 937. Emulsion film, first screw stud, 9381. Second screw stud, 939, 9391. screw holes, 930. Reinforcing the connection.
Detailed Description
In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention is further described below with reference to the accompanying drawings and examples.
Example 1: 1-16, a soil structure concrete dynamic shear creep experiment device comprises a base 1, a control box 2 arranged on the base 1, an experiment frame 6 and a direct shear mechanism 7;
the control box 2 is internally provided with a dynamic control acquisition instrument, upper computer software and a display screen, and is respectively connected with the experiment frame 6 and the direct shear mechanism 7 through control wires, the experiment frame 6 and the direct shear mechanism 7 are controlled to work in the experiment process, the test piece 9 is sheared normally, the dynamic creep condition of the test piece 9 after the test piece 9 receives shearing force is observed, and the direct shear mechanism 7 is arranged on the experiment frame 6 and is used for shearing the test piece 9 normally;
in order to place the test piece 9, the test stand 6 is a liftable test stand, and comprises an upper beam frame 61, a carrying tray 62, a first hydraulic cylinder 64 and a guide rod 65, wherein the carrying tray 62 is arranged on a test stand 69 of the base 1 through a steering adjusting mechanism, an objective table 63 is arranged on the carrying tray 62, a clamping groove 631 is further arranged on the objective table 63, the clamping groove 631 is matched with a second test piece sleeve 92 arranged at the lower end of the test piece 9 for use, and when in use, the clamping groove 631 is utilized to limit the second test piece sleeve 92,
the first hydraulic cylinders 64 are symmetrically arranged on two sides of the test bed 69, the top of a piston rod of each first hydraulic cylinder 64 is connected with the upper beam frame 61, the upper beam frame 61 is driven to move through the movement of the piston rod of each first hydraulic cylinder 64 so as to meet the shearing requirement of the test piece 9 without height, the guide rods 65 are arranged on the inner sides of the first hydraulic cylinders 64 and play a guiding role, the upper beam frame 61 is guaranteed to move up and down to be absolutely vertically, the tail end of one end of each guide rod 65 penetrating through the upper beam frame 61 is provided with a hanging ring 67, and the direct shearing mechanism 7 is arranged on the upper beam frame 61 and applies normal shearing force to the test piece 9.
Preferably, in order to apply a normal shearing force to the test piece 9, the direct shear mechanism 7 includes a second direct shear hydraulic cylinder 71 and a direct shear disc 72, the second direct shear hydraulic cylinder 71 is fixedly mounted on the upper beam frame 61 through the mounting assembly 66, the end of a piston rod of the second direct shear hydraulic cylinder 71 is connected with the direct shear disc 72, the normal shearing force is applied to the test piece 9 by using the direct shear disc 72 in use, and in order to detect the deformation and creep conditions of the test piece 9 in real time during the normal shearing force application process, a first direct shear displacement sensor 73 is arranged at the center position of the direct shear disc 72 and is used for reflecting the deformation and creep conditions of the test piece 9 in real time during the normal shearing force application process.
In order to install and fix the second direct shear hydraulic cylinder 71, the installation component 66 includes a first hydraulic cylinder limiting cylinder 661, a second hydraulic cylinder limiting cylinder 662, a first connecting rod 664 and a telescopic sleeve 665, the first hydraulic cylinder limiting cylinder 661 is arranged on the upper side of the second hydraulic cylinder limiting cylinder 662, the tail of the first hydraulic cylinder limiting cylinder 661 is sealed, the second direct shear hydraulic cylinder 71 is limited, the first connecting rod 664 and the telescopic sleeve 665 are arranged on the outer side parts of the first hydraulic cylinder limiting cylinder 661 and the second hydraulic cylinder limiting cylinder 662 through connecting arms 663, the first connecting rod 664 is matched with the telescopic sleeve 665, and the first connecting rod 664 is movably sleeved and connected with the telescopic sleeve 665; the outside of telescopic sleeve 665 is provided with from locking piece 667 through the rotation of hinge pin 668, the front end closure portion of self-locking piece 667 is provided with first skewed tooth 6671, first skewed tooth 6671 and the second skewed tooth 6641 that sets up on first connecting rod 664 are used in the cooperation, promptly in the in-process of installing second direct shear hydraulic cylinder 71, will install second direct shear hydraulic cylinder 71 in first pneumatic cylinder spacing section of thick bamboo 661 and second pneumatic cylinder spacing section of thick bamboo 662, and first pneumatic cylinder spacing section of thick bamboo 661 and corresponding part down moves under the effect of gravity, when waiting to contact with second direct shear hydraulic cylinder 71 afterbody, first pneumatic cylinder spacing section of thick bamboo 661 stops the motion, the first skewed tooth 6671 of the front end closure portion of self-locking piece 667 and second skewed tooth 6641 interlock each other, accomplish the auto-lock, when needs take out, only need push down self-locking piece 667 can realize the auto-lock connection of first connecting rod 664 and self-locking piece 667, upwards take out first connecting rod 664.
By using the soil mass structure concrete dynamic shear creep experiment device, the direct shear test of the test piece 9 can be completed.
Example 2: unlike embodiment 1, for the radial shear test of test piece 9, soil mass structure concrete dynamic shear creep experimental apparatus still include radial shear mechanism 8, radial shear mechanism 8 sets up on experiment frame 6, radial shear mechanism 8 is controlled the action by control box 2 for radially shearing test piece 9, just radial shear mechanism 8 symmetry sets up on test bench 69, applys radial shear force to test piece 9.
Preferably, in order to apply radial shearing force to the test piece 9, the radial shearing mechanism 8 includes an inclined support 81, an L-shaped mounting frame 82, a third jacking cylinder 83, a fourth radial shearing cylinder 84, a radial shearing disc 85 and a second radial shearing displacement sensor 86, wherein the inclined support 81 is arranged on the base 1 through a fastener to support the mounting frame 82, a sliding groove 811 is arranged on the inner side of the inclined support 81, the sliding groove 811 is matched with a sliding guide block 821 arranged on the back side of the mounting frame 82, namely, the inclined support 81 is slidably mounted on the mounting frame 82 through the sliding groove 811 and the sliding guide block 821, the third jacking cylinder 83 is arranged between the mounting frame 82 and the base 1 and is used for jacking the mounting frame 82 to realize the application of radial shearing force to the test piece 9 at different heights, the fourth radial shearing cylinder 84 is arranged on the mounting frame 82, the piston rod end of the fourth radial shearing cylinder is connected with the radial shearing disc 85, the radial shearing disc 85 is used for applying radial shearing force to the test piece 9, and the second radial shearing displacement sensor 86 is arranged at the center of the radial shearing disc 85 and is matched with the shearing ring 93 to reflect the real-time creep deformation process of the test piece 9; meanwhile, in order to facilitate the radial shearing force application process, the test piece 9 cannot move, a first test piece sleeve 91 is further arranged at the upper end of the test piece 9, the first test piece sleeve 91 is matched with the straight shearing disc 72 for use, and a clamping groove is further formed in the straight shearing disc 72 to limit the first test piece sleeve 91.
Preferably, in order to ensure that the shearing ring 93 is stressed entirely rather than locally during the process of applying the horizontal shearing force, the shearing unit is designed to be composed of a plurality of shearing units with the same structure, the shearing unit comprises an outer ring arc 931 and an inner ring arc 932, the outer ring arc 931 is arranged on the outer side of the inner ring arc 932 to protect the inner ring arc 932, the outer ring arc 931 is connected with the inner ring arc 932 through a connecting component, and in order to facilitate the connection of two adjacent outer ring arcs 931, arc grooves 933 and arc plates 934 are arranged at two ends of the outer ring arc 931, the arc grooves 933 between the two adjacent outer ring arcs 931 are matched with the arc plates 934, namely, the arc grooves 933 on the two adjacent outer ring arcs 931 are spliced with the arc plates 934 and are fixed through fixing bolts 935, the connection of the two adjacent outer ring arcs 931 is realized, a plurality of limit round holes 936 are arranged on the outer side of the outer ring arc 931, latex pieces 937 are further arranged on the inner side of the inner ring arc 932 to enhance the integrity of the shearing surface, and the latex pieces 937 are matched with test pieces 9.
Preferably, in order to facilitate connection between the outer ring arc 931 and the inner ring arc 932, the connection assembly includes an adjusting portion and a reinforcing portion, the adjusting portion is symmetrically disposed at the upper and lower ends of the reinforcing portion, and includes a bolt member 939 and a first screw connection post 938, an external thread of the bolt member 939 is matched with an internal thread of a threaded hole on the outer ring arc 931, and a screw connection hole 9391 is disposed on the bolt member 939, an internal thread of the screw connection hole 9391 is matched with an external thread of the first screw connection post 938, that is, when in use, the outer ring arc 931 and the inner ring arc 932 are connected by rotating the bolt member 939, and a relative distance between the outer ring arc 931 and the inner ring arc 932 is adjusted by rotating a connection depth of the bolt member 939 and the first screw connection post 938, so that the connection assembly is suitable for test pieces 9 with different diameters.
Preferably, in order to enhance the integrity of the outer ring arc 931 and the inner ring arc 932, avoid the deformation of the outer ring arc 931 or the inner ring arc 932 caused by an external force, the reinforcing portion includes a reinforcing connecting member 930 and a second screw connection column 9381, the first screw connection column 938 is symmetrically disposed on the upper and lower sides of the second screw connection column 9381, and the second screw connection column 9381 is in threaded connection with the reinforcing connecting member 930, the front end portion of the reinforcing connecting member 930 is further provided with a spherical pressure head, the spherical pressure head is matched with the inner side surface of the outer ring arc 931, that is, the spherical pressure head is tightly pressed on the inner side surface of the outer ring arc 931 by manually adjusting the reinforcing connecting member 930, so as to reinforce the outer ring arc 931.
Preferably, in use, in order to rotate the objective table 63 according to the experiment requirement, a radial shearing force is applied to different positions of the test piece 9, a radial shearing creep experiment is performed on the test piece 9, the steering adjustment mechanism includes a first bearing 621, a first gear 622, a second gear 681 and an adjusting member 68, a limiting column 632 is disposed at a central position of the test table 69, the objective table 62 is connected with the limiting column 632 through the first bearing 621, the first gear 622 is fixedly disposed at an outer side of the objective table 62 and is meshed with the second gear 681, the second gear 681 is fixedly disposed on an adjusting rod 684 of the adjusting member 68, an adjusting button is disposed at an upper end of the adjusting rod 684, and a lower end of the adjusting rod 684 is rotatably connected with a positioning sleeve 683 disposed on the test table 69 through a second bearing 682, so that when in use, an experimenter can rotate the second gear 681 through manual rotation of the adjusting button, the second gear 681 drives the first gear 622 to coaxially rotate with the objective table 62 through a meshing force with the first gear 622, and then the axial creep experiment table 9 is further applied to the test piece 9 at different positions.
The radial shear creep test of the test piece 9 can be performed by using the soil structure concrete dynamic shear creep test device described in the embodiment 2; meanwhile, in combination with the above embodiment 1, radial and normal shear creep experiments on the test piece 9 can also be completed.
Technical parameters of the soil structure concrete dynamic shear creep experimental device described in the above embodiment 1 and embodiment 2 are as follows:
(1) Sample size: selecting other specifications with phi of 300mm multiplied by 300 mm;
(2) Normal loading range: 0-300 KN; according to the required loading of the sample area, the constant adjustment is arbitrarily set;
(3) The first direct shear displacement sensor 73 measures a parameter of vertical deformation: 0-50 mm, and the precision is 0.01mm;
(4) Radial shear load: 300KN; selecting according to the area of the sample;
(5) Stress control during shear: controlling the dynamic shear stress to be 0-300kN with the precision of +/-2N; selecting other specifications; constant stress control, loading waveform (positive wave) and collecting dynamic shear deformation;
(6) Strain control of test piece 9: controlling the loading waveform (positive brown wave) at 0.1-5 mm/min;
(7) Vibration frequency: arbitrarily setting 0-5 Hz;
(8) Amplitude of: 0.08-1.5 mm;
(9) 13 sections of continuous vibration can be arranged on the dynamic shear section, the frequency and the waveform;
(10) Shear deformation: 0-50 mm, precision + -0.001 mm;
(11) Computer control mode: the servo motor controls horizontal stress deformation (constant force and constant strain), and the dynamic shear amplitude is adjustable; displaying record, storage, drawing graph and derived data in real time for analysis and calculation;
(12) And (3) stopping the machine under the condition: the length, strain and deformation are set, and the acquisition frequency is set arbitrarily from 2 milliseconds to 1 kilomillisecond.
Example 3: unlike the above embodiment, in order to facilitate the movement of the experimental device for dynamic shear creep of the soil structural concrete, a plurality of moving wheels 5 are further disposed on the base 1 through the moving wheel lifting mechanism 4, the moving wheel lifting mechanism 4 includes a fifth lifting cylinder 42, guide rails 41, a sliding block 43 and a moving wheel connecting piece 44, the guide rails 41 are symmetrically disposed on the side wall of the base 1, the fifth lifting cylinder 42 is fixed between the two guide rails 41 to perform guiding function, the end of a piston rod of the fifth lifting cylinder 42 is connected with the sliding block 43, the sliding block 43 is driven to move along the guide rails 41 by the fifth lifting cylinder 42, the moving wheel connecting piece 44 is disposed at the lower end of the sliding block 43 and connected with the moving wheel 5, that is, in the use process, the movement of the fifth lifting cylinder 42 is controlled according to the moving and fixing requirements, so as to realize the height adjustment of the moving wheel 5.
Preferably, in order to facilitate the expansion of the area, the device is fixed and positioned, the four corners of the base 1 are further provided with a positioning mechanism 3 through the hinge plate 11, the positioning mechanism 3 comprises a rotating arm 31, a rotating connecting piece 32, a supporting leg rod 35 and a supporting leg disc 38, the rotating connecting piece 32 is connected with the hinge plate 11 through a first fixed positioning pin 33 so as to realize the rotating installation of the rotating connecting piece 32, one end of the rotating arm 31 is connected with the rotating connecting piece 32 through a second fixed positioning pin 34 so as to realize the rotating installation of the rotating arm 31, the other end of the rotating arm 31 is provided with a threaded sleeve rod 36, the threaded sleeve rod 36 is in threaded connection with the supporting leg rod 35, the upper end of the supporting leg rod 35 is provided with an adjusting handle 34, the supporting leg disc 38 is arranged at the lower end of the supporting leg rod 35, and is connected with the supporting leg rod 35 through a positioning plate 37, namely, when the device is not in use, the rotating arm 31 is rotated towards the direction of the base 1 so as to be fixed at the side edge of the base 1, when the device is required to be used, the rotating arm 31 outwards again, the rotating connecting piece 32 is driven to rotate, the rotating arm 31 is adjusted, the adjusting angle of the supporting leg rod 31 is driven, the adjusting handle is adjusted, and the adjusting handle is fixed on the ground, or the supporting leg disc is fixed on the ground, and the adjusting device is fixed on the ground.
Preferably, in order to avoid that the stability of the overall structure is affected by the rotation of the rotating connector 32 during the dynamic shear creep test of the soil structural concrete, the first fixed positioning pin 33 is designed to be a hollow positioning pin, and the first fixed positioning pin 33 is a polygonal cavity, and the polygonal cavity is matched with the locking pin 39 for use, that is, when the locking pin 39 is inserted from the upper hinge plate 11 and is to be inserted into the polygonal cavity of the first fixed positioning pin 33, the stability of the overall structure is affected by the rotation of the rotating connector 32 is prevented due to the constraint action of the polygon, and the rotation angle of the rotating connector 32 is locked.
Through the embodiment, the movement of the soil body structure concrete dynamic shear creep experiment device can be completed.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (6)
1. A soil body structure concrete dynamic shear creep experimental apparatus, its characterized in that: the device comprises a base, a control box, an experiment frame, a direct shear mechanism and a radial shear mechanism, wherein the control box, the experiment frame, the direct shear mechanism and the radial shear mechanism are arranged on the base, the control box is respectively connected with the experiment frame, the direct shear mechanism and the radial shear mechanism, and the direct shear mechanism is arranged on the experiment frame;
the experiment frame comprises an upper beam frame, a carrying disc, a first hydraulic cylinder and a guide rod, wherein the carrying disc is arranged on a test bed of a base through a steering adjusting mechanism, an objective table is arranged on the carrying disc, the first hydraulic cylinder is symmetrically arranged on the test bed, the top of a piston rod of the first hydraulic cylinder is connected with the upper beam frame, the guide rod is arranged on the inner side of the first hydraulic cylinder, a hanging ring is arranged at the tail end of the guide rod, the direct shearing mechanism is arranged on the upper beam frame, and the radial shearing mechanism is symmetrically arranged on the test bed;
the radial shearing mechanism comprises an inclined support, an L-shaped mounting frame, a third jacking cylinder, a fourth radial shearing cylinder, a radial shearing disc and a second radial shearing displacement sensor, wherein the inclined support is arranged on the base, a sliding groove is formed in the inner side of the inclined support and matched with a sliding guide block arranged on the L-shaped mounting frame for use, the third jacking cylinder is arranged between the L-shaped mounting frame and the base, the fourth radial shearing cylinder is arranged on the L-shaped mounting frame and connected with the radial shearing disc, and the second radial shearing displacement sensor is arranged in the center of the radial shearing disc and matched with a test piece through a shearing ring for use;
the shearing ring consists of a plurality of shearing units with the same structure, the shearing units comprise an outer ring arc and an inner ring arc, the outer ring arc is arranged on the outer side of the inner ring arc and is connected with the inner ring arc through a connecting assembly, an arc groove and an arc plate are arranged on the outer ring arc, the arc groove between two adjacent outer ring arcs is matched with the arc plate for use, a limiting round hole is arranged on the outer ring arc, and the limiting round hole is matched with a second radial shear displacement sensor for use; the inner side of the inner circular arc is also provided with a latex film which is matched with the test piece for use;
the connecting assembly comprises an adjusting part and a reinforcing part, wherein the adjusting part is arranged at the upper end and the lower end of the reinforcing part and comprises a bolt piece and a first screw-connection column, the bolt piece is in threaded connection with the outer ring arc, and a screw-connection hole is formed in the bolt piece and is in threaded connection with the first screw-connection column; the reinforcing part comprises a reinforcing connecting piece and second screw connection columns, the first screw connection columns are symmetrically arranged on the upper side and the lower side of the second screw connection columns, the second screw connection columns are in threaded connection with the reinforcing connecting piece, a spherical pressure head is further arranged on the reinforcing connecting piece, and the spherical pressure head is matched with an outer ring arc for use;
the steering adjusting mechanism comprises a first bearing, a first gear, a second gear and an adjusting piece, wherein a limit column is arranged on the test bed, the carrying disc is connected with the limit column through the first bearing, the first gear is arranged on the outer side of the carrying disc and meshed with the second gear, the second gear is arranged on an adjusting rod of the adjusting piece, an adjusting button is arranged on the adjusting rod, and the lower end of the adjusting rod is rotationally connected with a positioning sleeve arranged on the test bed through a second bearing; still be provided with the draw-in groove on the objective table, the draw-in groove uses with the cooperation of the second test piece cover that sets up at the test piece lower extreme.
2. The soil body structure concrete dynamic shear creep experiment device according to claim 1, wherein: the direct shear mechanism comprises a second direct shear hydraulic cylinder and a direct shear disc, the second direct shear hydraulic cylinder is arranged on the upper beam frame through a mounting assembly and is connected with the direct shear disc, and a first direct shear displacement sensor is arranged at the center of the direct shear disc.
3. The soil body structure concrete dynamic shear creep experiment device according to claim 2, wherein: the mounting assembly comprises a first hydraulic cylinder limiting cylinder, a second hydraulic cylinder limiting cylinder, a first connecting rod and a telescopic sleeve, wherein the first hydraulic cylinder limiting cylinder is arranged on the second hydraulic cylinder limiting cylinder, the first connecting rod and the telescopic sleeve are arranged on the outer sides of the first hydraulic cylinder limiting cylinder and the second hydraulic cylinder limiting cylinder through connecting arms, and the first connecting rod is matched with the telescopic sleeve; the telescopic sleeve is characterized in that the outer side of the telescopic sleeve is rotatably provided with a self-locking block through a hinge pin, the front end of the self-locking block is provided with a first helical tooth, and the first helical tooth is matched with a second helical tooth arranged on a first connecting rod.
4. The soil body structure concrete dynamic shear creep experiment device according to claim 1, wherein: the base on still be provided with the removal wheel through removing wheel elevating system, remove wheel elevating system includes fifth lift cylinder, guided way, slider and removes the wheel connecting piece, the guided way sets up on the base, fifth lift cylinder is fixed between two guided ways, and fifth lift cylinder is connected with the slider, remove the wheel connecting piece setting and be connected at the lower extreme of slider, and with removing the wheel.
5. The soil body structure concrete dynamic shear creep experiment device according to claim 1, wherein: the base on still be provided with positioning mechanism through the articulated slab, positioning mechanism includes the rotating arm, rotates connecting piece, stabilizer blade pole and stabilizer blade dish, it is connected with the articulated slab through first fixed locating pin to rotate the connecting piece, the one end of rotating the arm is connected with rotating the connecting piece through the fixed locating pin of second, and is provided with the screw thread loop bar at the other end of rotating the arm, screw thread loop bar and stabilizer blade pole threaded connection, and be provided with the regulation handle in the upper end of stabilizer blade pole, the stabilizer blade dish sets up the lower extreme at the stabilizer blade pole, and is connected with the stabilizer blade pole.
6. The experimental device for dynamic shear creep of soil structural concrete according to claim 5, wherein: the first fixed locating pin is a hollow locating pin, the first fixed locating pin is a polygonal cavity, and the first fixed locating pin is matched with the locking pin for use to lock the rotation angle of the rotation connecting piece.
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