CN114594048A - Method for testing shear characteristics of waste tire-soil horizontal interface - Google Patents
Method for testing shear characteristics of waste tire-soil horizontal interface Download PDFInfo
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- CN114594048A CN114594048A CN202210233353.0A CN202210233353A CN114594048A CN 114594048 A CN114594048 A CN 114594048A CN 202210233353 A CN202210233353 A CN 202210233353A CN 114594048 A CN114594048 A CN 114594048A
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract
The application discloses a method for testing shearing characteristics of a waste tire-soil horizontal interface, wherein a vertical loading jack, a horizontal push-pull actuator, a tire fixing frame and a sliding device are arranged on a reaction frame, a shearing box is arranged on the sliding device, soil is filled in the shearing box, a waste tire is placed on the soil, an annular base plate, a load transfer piece, a load transfer stiffening rib beam and a pressure bearing plate are sequentially arranged on a horizontal tire tread in the waste tire from bottom to top, the vertical loading jack and the pressure bearing plate are connected, the horizontal push-pull actuator and the shearing box are connected, the load transfer piece, the waste tire and the tire fixing frame are fixedly connected into a whole through bolts, and a data acquisition system is installed; the shear test was performed by applying stress to the shear box by means of a horizontal push-pull actuator. The method meets the requirements of the shear test on different burial depths and size conditions, eliminates the friction influence between soil and soil, and grasps the shear expansion (shrinkage) rule of the interface and the movement and crushing characteristics of soil particles near the interface from the microscopic scale.
Description
Technical Field
The invention relates to the technical field of civil engineering and geological engineering tests, in particular to a method for testing shear characteristics of a horizontal interface of a waste tire and soil.
Background
In recent years, with the continuous increase of automobile output, the number of discarded waste tires is also increased dramatically year by year, a large amount of waste tires not only occupy the land, but also pollute the natural environment, and serious environmental protection problems can be brought to the improper treatment of the waste tires, thus harming the health of surrounding residents. Therefore, how to recycle the waste tires scientifically, environmentally, economically, safely and efficiently is a great practical problem to be solved urgently. At present, waste tires have the characteristics of good durability, circumferential tensile property, tread friction resistance and the like, and are applied to reinforced earth engineering such as reinforced rock-soil slopes, retaining walls, embankments, soft foundations and the like. The shear mechanical behavior of the rib-soil interface is one of the core mechanisms of reinforced soil engineering, so the measurement of the shear mechanical property of the waste tire-soil interface is crucial to master the reinforcing mechanism and performance of the waste tire reinforced soil.
Generally, in order to exert the reinforcing benefit of the waste tires on rock soil to the maximum extent, the waste tire reinforced soil is formed by horizontally arranging the tires and then embedding the tires into an underground soil layer, and considering the shape of the tires, the interaction interface of the waste tires and the soil has a vertical interface and a horizontal interface. At present, the quantity of mechanical testing devices for the whole waste tire reinforced soil and the waste tire-soil horizontal interface is small, and a shearing test is mostly carried out by intercepting a local tire piece, so that the difference from the practical application situation is large, and the shearing mechanical property of the whole waste tire-soil horizontal interface cannot be reflected.
Some researchers have further developed shear test devices that may involve the entire tire interface, which typically consist of two shear boxes, upper and lower, filled with soil, typically where the tire is embedded in the soil of the shear boxes and allowed to slide along a horizontal shear plane for test testing. Because the diameter of the tire is larger, the horizontal cross-sectional area of the soil filled in the diameter range of the tire surface is larger, so that the friction shearing between the filling soil in the tire and the shearing surface soil (hereinafter referred to as soil-soil) of the horizontal interface accounts for a large proportion of the shearing strength of the horizontal interface of the reinforced soil of the tire. However, due to the limitations of the structure and functions of the device, the existing shear test device for the rib-soil horizontal interface cannot eliminate the friction influence between soil and soil in the test process, and the test result confidence of the mechanical and deformation characteristics of the waste tire-soil horizontal interface is general, so that the test result cannot reflect the shear characteristics of the horizontal interface between the tire and the soil body in the true sense. Moreover, the existing shear test device for the horizontal interface of the rib and the soil can not meet the research requirements on the movement and the crushing characteristics of soil particles near the horizontal interface of the waste tire and the soil from a microscopic level, can not measure the shear expansion (shrinkage) deformation characteristics of the reinforced soil of the waste tire in the shearing process, and is not suitable for the test of the mechanical properties of the interfaces of the tire and the soil with different specifications and dimensions (the diameter of the tire, the height of a tire tread and the like), and has a plurality of technical defects.
Therefore, a new scheme for testing the shear characteristics of the horizontal interface between the waste tire and the soil is urgently needed in the industry to solve the technical problems.
Disclosure of Invention
The application aims to provide a method for testing the shearing characteristic of a waste tire-soil horizontal interface, which meets the test requirements of researching the shearing characteristics of waste tire-soil horizontal interfaces with different specifications and burial depths and can reveal the movement and crushing characteristics of soil particles near the interface. The technical scheme of the application is as follows:
a method for testing shear characteristics of a horizontal interface between a waste tire and soil comprises the following steps:
step S1: installing a servo loading system:
assembling a reaction frame, and fixedly arranging a vertical loading jack and a horizontal push-pull actuator on the reaction frame;
step S2: installing a sample system, a horizontal force sensor and a vertical force sensor:
the device comprises a reaction frame, a horizontal push-pull actuator, a vertical loading jack, a shear box, a horizontal force sensor, a vertical force sensor and a vertical force sensor, wherein the reaction frame is fixedly provided with a sliding device, the slide device is slidably provided with the shear box which is uncovered and comprises a transparent side wall, soil is uniformly filled in the shear box, a waste tire is horizontally placed on the upper surface of the soil, and only the downward horizontal tread and the vertical arc tread are reserved;
step S3: installing a vertical load transfer system, a vertical displacement meter and a second interface deformation microscopic camera:
the horizontal tread of the waste tire is sequentially provided with an annular base plate, a load transfer member, a load transfer stiffening rib beam and a pressure bearing disc from bottom to top, so that the assembled vertical load transfer system and the waste tire share a central axis, a vertical displacement meter and a second interface deformation microscopic camera are arranged above the soil body, and the pressure bearing disc is connected with a power output shaft of a vertical loading jack;
step S4: the fixed sample system is provided with a horizontal shear displacement meter and a first interface deformation microscopic camera:
the method comprises the following steps that a tire fixing frame with adjustable height is installed on a counter-force frame, the tire fixing frame, a waste tire and a load transfer piece are fixedly connected into a whole through bolts, a vertical loading jack is used for applying pressure to the load transfer piece, the tire fixing frame and the counter-force frame are fixedly connected after vertical load is stabilized, a horizontal shearing displacement meter is arranged in the sliding direction of a shearing box, and a first interface deformation micro-camera is arranged outside the shearing box and opposite to a transparent side wall;
step S5: shear test:
and applying stress to the shearing box by using the horizontal push-pull actuator to perform a shearing test, and recording test results obtained by the vertical force sensor, the horizontal shearing displacement meter, the vertical displacement meter, the first interface deformation micro-camera and the second interface deformation micro-camera.
In some embodiments, in step S1, the reaction frame includes a first supporting seat and a second supporting seat disposed opposite to each other, and a pillar disposed vertically between the two supporting seats; the process of installing the servo loading system specifically comprises the following steps:
vertical setting of vertical loading jack is connected vertical loading jack and hydraulic servo I at the lower surface of first supporting seat the upper surface of second supporting seat is equipped with the reaction wall, sets up horizontal push-and-pull actuator level on the reaction wall, connects horizontal push-and-pull actuator and hydraulic servo II.
In some specific embodiments, in step S2, the sliding device includes a first sliding slot and a second sliding slot that are disposed opposite to each other up and down, and a plurality of rolling bodies that are uniformly distributed at intervals between the two sliding slots, and the process of installing the sample system specifically includes:
and the second sliding groove is fixedly arranged on the upper surface of the second supporting seat, the rolling body is correspondingly embedded in the circular arc groove of the second sliding groove, lubricating oil is injected into the circular arc groove, the first sliding groove is fixedly arranged on the lower bottom surface of the shearing box, the position of the shearing box is adjusted, the circular arc groove of the first sliding groove is attached to the surface of the rolling body, and meanwhile, the plane center of the shearing box is ensured to be positioned under the power output shaft of the vertical loading jack and the transparent side wall is not shielded.
In some specific embodiments, in step S3, the load transfer member includes a plurality of load transfer cylinders vertically arranged and uniformly distributed at intervals along the circumferential direction of the annular pad plate, and load transfer circular plates arranged on the upper end surfaces of all the load transfer cylinders, and corresponding holes are arranged on the load transfer cylinders and the arc-shaped tread of the waste tire; the process of installing the vertical load transfer system specifically comprises the following steps:
the method comprises the steps of placing an annular base plate on the upper surface of a horizontal tread of a waste tire, placing a load transfer member on the annular base plate, rotating the load transfer member until holes in a load transfer cylinder correspond to holes in the waste tire one by one, placing a load transfer stiffening rib beam on a load transfer circular plate, enabling the end part of the load transfer stiffening rib beam to be pressed right above the load transfer cylinder, installing a bearing plate at the center of the top surface of the load transfer stiffening rib beam, and enabling a power output shaft of a vertical loading jack to be in centering connection with the top surface of the bearing plate.
In some embodiments, in step S3, a diagonal brace extending toward the center is disposed on the annular pad; the process of installing the vertical displacement meter and the second interface deformation micro-camera specifically comprises the following steps:
and a vertical displacement meter is installed and debugged at the end part of the diagonal brace, a second interface deformation micro-camera is installed and debugged at the center of the bottom surface of the load transfer circular plate, so that a monitoring lens of the second interface deformation micro-camera is opposite to the top surface of the soil body in the inner ring range of the waste tire, and data wires of the vertical displacement meter and the second interface deformation micro-camera are connected out from a gap between the waste tire and the load transfer member.
In some embodiments, in step S4, the tire fixing frame includes a fixing frame, a quick-release latch, and a connecting member, the fixing frame is movably disposed on the reaction frame through the quick-release latch, the connecting member is circumferentially and uniformly distributed on the fixing frame, the connecting member includes a connecting rod disposed along a radial direction of the waste tire and a connecting head located at a radial inner end of the connecting rod, the connecting heads cooperate to form a space for accommodating the waste tire, the connecting head is provided with a hole corresponding to the hole on the arc-shaped tread of the waste tire, the radial outer end of the connecting rod is provided with a thread, and the fixing frame is provided with a through hole corresponding to the connecting rod; the process of fixing the sample system specifically comprises:
correspondingly penetrating the radial outer end of the connecting rod through a through hole in the fixing frame, adjusting the height position of the fixing frame and the length of the radial outer end of the connecting rod extending out of the through hole to enable the connector to be attached to the arc-shaped tread of the waste tire and the hole position to be corresponding, inserting a bolt into the connector, the arc-shaped tread of the waste tire and the corresponding hole in the load transfer cylinder, and screwing the bolt to fixedly connect the connector, the arc-shaped tread of the waste tire and the load transfer cylinder into a whole;
after the vertical load is stabilized, the connecting piece is fixed on the fixing frame by the nut, and the fixing frame is fixed on the reaction frame by the quick-release lock catch.
In some specific embodiments, in step S4, a placement plate is disposed on a frame of the fixing frame in the direction of the transparent sidewall, a height of a placement plane on the placement plate is lower than an upper surface of a soil body, and a support rod extending in the sliding direction of the shearing box is disposed on the placement plate; the process of installing the horizontal shear displacement meter and the first interface deformation microscopic camera specifically comprises the following steps:
the horizontal shearing displacement meter is installed and debugged at the end part of the supporting rod, the first interface deformation micro-camera is installed and debugged on the object placing plate, and a monitoring lens of the first interface deformation micro-camera is enabled to penetrate through the transparent side wall of the shearing box and face the top surface of the soil body 6 in the range of the outer ring of the waste tire.
In some embodiments, different depths of burial are simulated by varying the magnitude of the vertical load applied in step S4.
In some embodiments, the horizontal push-pull actuator is an actuator with cyclic loading and unloading functions, and in step S5, a cyclic reciprocating shear test is performed through the action of the horizontal push-pull actuator.
In some embodiments, after the test is finished, the shear stress is unloaded through the horizontal push-pull actuator, the vertical stress is unloaded through the vertical loading jack, the data acquisition system is closed, the data line connected with the data acquisition system is pulled out, and each connecting bolt, the pressure bearing disc, the load transfer stiffening rib beam, the load transfer member, the annular base plate, the waste tire and the soil body are sequentially removed.
The technical scheme provided by the application has at least the following beneficial effects:
1. according to the device and the method, the vertical load can be applied to the horizontal contact surface of the waste tire and the soil without filling the soil body in the waste tire, the horizontal shearing interface of the sample system is only the contact surface of the waste tire and the soil, the defect that the friction influence between the soil and the soil cannot be eradicated by the conventional rib-soil interface shearing test device is overcome, the test of the mechanical characteristics of the waste tire-soil horizontal interface is realized, and the vacancy of the waste tire-soil horizontal interface shearing mechanical property test device is filled.
2. According to the test device, the sliding device filled with lubricating oil and the rolling bodies is arranged at the bottom of the shearing box, so that the friction force between the sample system and the device base is obviously reduced, the test result of the shearing force of the horizontal interface of the waste tire and the soil is ensured to be closer to the real working condition, and the test precision is higher.
3. According to the method, part of the side wall of the shearing box is transparent and visible, and the interface deformation micro-cameras are arranged on the outer side of the transparent side wall of the shearing box and the bottom surface of the load transfer circular plate, so that the requirements of the research on the reinforcement mechanism such as the movement and the breaking characteristics of soil particles near the waste tire-soil horizontal interface from a microscopical layer in the test process are met.
4. The vertical loading jack and the horizontal push-pull actuator are matched to simulate different burial depth conditions, and the detachable annular base plate, the load transferring piece and the tire fixing frame are used to match with waste tires of different specifications to test, so that the research on the size effect of the shear characteristic of the waste tire-soil horizontal interface caused by the change of shape parameters such as tire thickness, diameter, tread width and the like is realized.
5. The horizontal push-pull actuator with the cyclic loading and unloading functions is used, so that the aim of researching the shear mechanical properties of the horizontal interface of the waste tire and the soil under the action of cyclic shear load is fulfilled.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and that other drawings may be derived from those drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a scrap tire-soil horizontal interface shear property test method of the present application;
FIG. 2 is a schematic perspective view of an apparatus used in the method for testing shear characteristics of a horizontal interface between a waste tire and soil according to the present application;
FIG. 3 is an axial cross-sectional view of FIG. 2;
FIG. 4 is a schematic structural view of the support system of FIG. 2;
FIG. 5 is a schematic structural view of the tire holder shown in FIG. 4;
FIG. 6 is a schematic view of the bottom surface of the second support seat shown in FIG. 4;
FIG. 7 is a schematic structural view of a bottom surface of the first supporting base shown in FIG. 4;
FIG. 8 is a schematic diagram of the sample system of FIG. 2;
FIG. 9 is a schematic structural diagram of the vertical load transfer system of FIG. 2;
FIG. 10 is a schematic diagram of the connection between the data acquisition system and the servo loading system in FIG. 2;
in the figure: 1. a reaction frame, 1.1 a first supporting seat, 1.2 a second supporting seat, 1.3 upright posts, 2 a tire fixing frame, 2.1 a fixing frame, 2.2 a quick-release lock catch, 2.3 a connecting piece, 2.3.1 a connecting rod, 2.3.2 a connecting head, 3 a waste tire, 4 a shearing box, 4.1 a transparent organic glass plate, 4.2 a U-shaped structure body, 4.3 a reinforcing rib, 4.4 a push-pull connecting head, 5 a sliding device, 5.1 a first sliding groove, 5.2 a second sliding groove, 5.3 a rolling body, 5.4 lubricating oil, 6 a soil body, 7 an annular base plate, 8, a load transfer piece, 8.1 a load transfer cylinder, 8.2 a load transfer circular plate, 9 a load transfer rib stiffening beam, 10 a bearing plate, 11 a vertical loading jack, 12 a horizontal push-pull, 13 a hydraulic servo, 14, a hydraulic servo I, 15, a data acquisition instrument, 16, a vertical sensor, a horizontal displacement transducer, 18 a horizontal displacement meter, 19. vertical displacement meter, 20, first interface deformation micro camera, 21, second interface deformation micro camera, 22, reaction wall, 23, put the thing board, 24, bracing piece, 25, diagonal brace.
Detailed Description
In order to facilitate understanding of the present application, the technical solutions in the present application will be described more fully and in detail with reference to the drawings and the preferred embodiments, but the scope of protection of the present application is not limited to the following specific embodiments, and all other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the scope of protection of the present application.
It will be understood that when an element is referred to as being "coupled" or "connected" to another element, it can be directly coupled, connected or communicated with the other element or indirectly coupled, connected or communicated with the other element via other intervening elements.
Unless otherwise defined, all terms of art used hereinafter have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the present application.
Referring to fig. 1 to 10, a method for testing the shear characteristics of a horizontal interface between a waste tire and soil relates to a new device for testing the shear characteristics of the horizontal interface between the waste tire and soil. The testing device comprises a supporting system, a sample system, a vertical load transfer system, a servo loading system and a data acquisition system, the supporting system comprises a reaction frame 1, a tire fixing frame 2 and a reaction wall 22, the sample system comprises a waste tire 3, a shearing box 4 and a sliding device 5, the vertical load transfer system comprises an annular base plate 7, a load transfer member 8, a load transfer stiffening rib beam 9 and a pressure bearing disc 10, the servo loading system comprises a vertical loading jack 11, a horizontal push-pull actuator 12, a hydraulic servo I13 and a hydraulic servo II 14, the horizontal push-pull actuator 12 is an actuator with cyclic loading and unloading functions, and the data acquisition system comprises a data acquisition instrument 15, a vertical force sensor 16, a horizontal force sensor 17, a horizontal shearing displacement meter 18, a vertical displacement meter 19, a first interface deformation micro-camera 20 and a second interface deformation micro-camera 21.
The test method comprises the following steps:
step S1: installation servo loading system
The reaction frame 1 comprises a first supporting seat 1.1 and a second supporting seat 1.2 which are oppositely arranged from top to bottom and a vertical column 1.3 which is vertically arranged between the two supporting seats, and a reaction wall 22 is arranged on the second supporting seat 1.2.
The reaction frame 1 is assembled, the vertical loading jack 11 is arranged on the lower surface of the first supporting seat 1.1, the hydraulic servo I13 and the hydraulic servo II 14 are arranged on the upper surface of the second supporting seat 1.2, the horizontal push-pull actuator 12 is arranged on the reaction wall 22, the vertical loading jack 11 and the hydraulic servo I13 are connected, the horizontal push-pull actuator 12 and the hydraulic servo II 14 are connected, and the data acquisition instrument 15 is placed in the corner area of the second supporting seat 1.2.
Step S2: installation sample system, horizontal force sensor and vertical force sensor
The sliding device 5 comprises a first sliding groove 5.1, a second sliding groove 5.2 and a plurality of rolling bodies 5.3, wherein the first sliding groove 5.1 and the second sliding groove 5.2 are arranged oppositely up and down, the rolling bodies 5.3 are uniformly distributed between the two sliding grooves at intervals, and arc-shaped grooves matched and attached with the surfaces of the rolling bodies 5.3 are formed in the first sliding groove 5.1 and the second sliding groove 5.2.
The second sliding groove 5.2 is fixedly arranged on the upper surface of the second supporting seat 1.2, the rolling bodies 5.3 are correspondingly embedded into the circular arc-shaped grooves of the second sliding groove 5.2, lubricating oil 5.4 is injected into the circular arc-shaped grooves, the transparent organic glass plate 4.1 is embedded into the grooves on two sides of the U-shaped structure body 4.2 to assemble the shearing box 4, the first sliding groove 5.1 is fixedly arranged on the lower bottom surface of the shearing box 4, the position of the shearing box 4 is adjusted, the circular arc-shaped grooves of the first sliding groove 5.1 are attached to the surfaces of the rolling bodies 5.3, and meanwhile, the plane center of the shearing box 4 is ensured to be positioned right below the power output shaft of the vertical loading jack 11 and the transparent side wall is not shielded.
Evenly fill the soil body 6 in shearing box 4, select the soil sample on the spot, according to soil body density, soil body water content and the inside volume of shearing box 4, weigh the quality that corresponds the soil sample, stir the soil sample and fill into shearing box 4 according to the mode of layering loading, tamp into soil body 6, ensure that the height of soil body 6 keeps unanimous basically with the inside degree of depth of shearing box 4, place junked tire 3 level in the central point of soil body 6 upper surface and only remain horizontal tread and vertical arc tread down.
The power output shaft of the horizontal push-pull actuator 12 is connected with a push-pull connector 4.4 of the shearing box 4, a horizontal force sensor 17 is arranged on the power output shaft of the horizontal push-pull actuator 12, a vertical force sensor 16 is arranged on the power output shaft of the vertical loading jack 11, the vertical loading jack 11 is communicated and debugged with an oil circuit of a hydraulic servo I13, the horizontal push-pull actuator 12 is communicated with an oil circuit of a hydraulic servo II 24, and data lines of the vertical force sensor 16 and the horizontal force sensor 17 are connected with a data acquisition instrument 15.
Step S3: installing a vertical load transfer system, a vertical displacement meter and a second interface deformation micro-camera
The load transferring part 8 comprises four load transferring cylinders 8.1 which are vertically arranged and circumferentially and uniformly distributed and load transferring circular plates 8.2 which are arranged on the upper end surfaces of all the load transferring cylinders 8.1, and corresponding holes are arranged on the load transferring cylinders 8.1 and the arc-shaped tire surfaces of the waste tires 3. The load-transferring stiffening rib beam 9 is of an equiarm cross structure and is formed by vertically and crossly connecting two I-shaped beams with equal length at the central point. The pressure bearing disc 10 is formed by two circular plates which share a central shaft and have a large diameter at the bottom and a small diameter at the top and are tightly attached to each other at the top and the bottom. The length of the I-beam of the load-transferring stiffening rib beam 9, the diameter of the load-transferring circular plate 8.2, the diameter of the circumscribed circle of all the load-transferring cylinders 8.1 and the outer diameter of the annular base plate 7 are all equal to the outer diameter of the upper surface of the horizontal tread of the waste tire 3, and the inner diameter of the annular base plate 7 and the diameter of the inscribed circle of all the load-transferring cylinders 8.1 are all equal to the inner diameter of the horizontal tread of the waste tire 3.
The annular base plate 7 is provided with an inclined stay bar 25, one end of the inclined stay bar 25 is fixedly connected with the annular base plate 7, specifically, the gap between adjacent load transfer cylinders 8.1 on the annular base plate 7, and the other end of the inclined stay bar 25 is obliquely upward and simultaneously points to the central position of the annular base plate 7.
First, the load-transmitting stiffening rib beam 9, the load-transmitting member 8 and the annular cushion plate 7 of appropriate sizes are selected according to the horizontal tread diameter and the arc-shaped tread height of the junked tire 3. An annular base plate 7 is placed on the upper surface of a horizontal tread of a waste tire 3, then a vertical displacement meter 19 is installed and debugged at the extending end of an inclined strut 25 and used for recording the expansion distance or the collapse distance of a soil body 6 in the vertical direction in a shearing test, a load transfer member 8 is arranged on the annular base plate 7, the load transfer member 8 is rotated until the holes on the load transfer cylinder 8.1 correspond to the holes on the waste tire 3 one by one, a second interface deformation micro-camera 21 is arranged and debugged at the center of the bottom surface of the load transfer circular plate 8.2, so that a monitoring lens of the second interface deformation micro-camera 21 is opposite to the top surface of the soil body 6 in the inner ring range of the waste tire 3, the vertical displacement meter 19 and the data line of the second interface deformation micro camera 21 are led out from the gap between the waste tire 3 and the load transfer member 8 and connected to the data acquisition instrument 15. A load-transferring stiffening rib beam 9 is arranged on the load-transferring circular plate 8.2, four ends of the load-transferring stiffening rib beam 9 are respectively and correspondingly arranged right above the four load-transferring cylinders 8.1, a bearing plate 10 is arranged at the center of the top surface of the load-transferring stiffening rib beam 9, and a power output shaft of a vertical loading jack 11 is in centered connection with the top surface of the bearing plate 10.
Step S4: sample fixing system, horizontal shear displacement meter and first interface deformation microscopic camera
The two frames of the fixing frame 2.1, which are positioned on one side of the transparent organic glass plate 4.1, are provided with object placing plates 23 through hanging rods, the object placing plate 23 is provided with an object placing plane with a height lower than the upper surface of the soil body 6, the object placing plate 23 is further provided with a support rod 24, one end of the support rod 24 is fixedly connected with the object placing plate 23, and the other end of the support rod 24 horizontally extends to the position close to the side plate of the shearing box 4, which is opposite to the push-pull connector 4.4, namely the sliding direction of the shearing box 4.
The radial outer end of the connecting rod 2.3.1 correspondingly penetrates through a through hole in the fixed frame 2.1, the height position of the fixed frame 2.1 and the length of the radial outer end of the connecting rod 2.3.1 exceeding the through hole are adjusted, the connecting head 2.3.2 is attached to the arc-shaped tread of the waste tire 3, the hole positions correspond to each other, bolts are inserted into corresponding holes in the connecting head 2.3.2, the arc-shaped tread of the waste tire 3 and the load transfer cylinder 8.1, and the bolts are screwed down to realize the fixed connection of the three parts into a whole.
Hydraulic servo I13 and data acquisition instrument 15 are started, confirm the load output data of vertical loading jack 11 according to simulation buried depth or experimental design, take notes vertical force sensor 16's testing result, treat that vertical load is stable the back, utilize the nut to fix connecting piece 2.3 on fixed frame 2.1, utilize quick detach hasp 2.2 and fastening bolt to fix fixed frame 2.1 on reaction frame 1.
A horizontal shear displacement meter 18 is arranged and debugged at the extending end of a supporting rod 24 and used for recording the horizontal displacement distance of a waste tire-soil horizontal interface in the test process, a first interface deformation micro-camera 20 is arranged and debugged on an object placing plate 23, a monitoring lens of the first interface deformation micro-camera 20 is enabled to penetrate through a transparent side wall of a shear box 4 and to be opposite to the top surface of a soil body 6 in the outer ring range of a waste tire 3 and used for monitoring the movement and crushing deformation rules of soil body particles near the top surface of the soil body 6 of the outer ring of the waste tire, and a data line of the first interface deformation micro-camera 20 and the horizontal shear displacement meter 18 is connected with a data acquisition instrument 15.
Step S5: shear test
And starting a hydraulic servo II 14, performing a circular reciprocating shearing test through the action of the horizontal push-pull actuator 12, recording and storing test results obtained by the vertical force sensor 16, the horizontal force sensor 17, the horizontal shearing displacement meter 18, the vertical displacement meter 19, the first interface deformation micro-camera 20 and the second interface deformation micro-camera 21, and observing the motion characteristics and the crushing condition of soil particles near the horizontal interface of the waste tire and the soil in the test process through the transparent organic glass plate 4.1.
After the test is finished, the shear stress is unloaded through the horizontal push-pull actuator 12, the vertical stress is unloaded through the vertical loading jack 11, the data acquisition instrument 15 is closed, the data line connected with the data acquisition instrument is pulled out, and each connecting bolt, the pressure bearing disc 10, the load transfer stiffening rib beam 9, the load transfer member 8, the annular base plate 7, the waste tire 3 and the soil body 6 are removed in sequence.
Changing the size of the waste tire 3, repeating the steps, and realizing the shear characteristic test of the waste tire-soil horizontal interface with different sizes, wherein the length of the excess part of the connecting rod 2.3.1 after penetrating through the through hole on the fixing frame 2.1 is adjusted to adapt to the waste tire 3 samples with different diameters; the height position of the fixing frame 2.1 is adjusted to adapt to waste tire 3 samples with different tread widths.
The method provides convenience for the research of the mechanical properties of the waste tire reinforced soil, also provides beneficial supplement for the development of the reinforced soil mechanical property testing technology, promotes the application of the waste tire in geotechnical engineering, and is beneficial to solving the recycling problem of the waste tire.
The above description is only a few examples of the present application and does not limit the scope of the claims of the present application, and it will be apparent to those skilled in the art that various modifications and variations can be made in the present application. Any improvement or equivalent replacement directly or indirectly applied to other related technical fields within the spirit and principle of the present application, which are made by using the contents of the specification and the attached drawings, shall be included in the protection scope of the present application.
Claims (10)
1. A method for testing shear characteristics of a horizontal interface between a waste tire and soil is characterized by comprising the following steps:
step S1: installing a servo loading system:
assembling a reaction frame (1), and fixedly arranging a vertical loading jack (11) and a horizontal push-pull actuator (12) on the reaction frame (1);
step S2: installing a sample system, a horizontal force sensor and a vertical force sensor:
the device is characterized in that a sliding device (5) is fixedly arranged on the reaction frame (1), a uncovered shearing box (4) with a transparent side wall is slidably arranged on the sliding device (5), soil bodies (6) are uniformly filled in the shearing box (4), waste tires (3) are horizontally placed on the upper surface of the soil body (6) and only downward horizontal tire treads and vertical arc tire treads are reserved, the shearing box (4) is connected with a power output shaft of a horizontal push-pull actuator (12), a horizontal force sensor (17) is arranged on the power output shaft of the horizontal push-pull actuator (12), and a vertical force sensor (16) is arranged on the power output shaft of a vertical loading jack (11);
step S3: installing a vertical load transfer system, a vertical displacement meter and a second interface deformation microscopic camera:
an annular base plate (7), a load transfer member (8), a load transfer stiffening rib beam (9) and a pressure bearing disc (10) are sequentially arranged on a horizontal tread of the waste tire (3) from bottom to top, so that the assembled vertical load transfer system and the waste tire (3) share a central axis, a vertical displacement meter (19) and a second interface deformation microscopic camera (21) are arranged above a soil body (6), and the pressure bearing disc (10) is connected with a power output shaft of a vertical loading jack (11);
step S4: the fixed sample system is provided with a horizontal shear displacement meter and a first interface deformation microscopic camera:
the method comprises the following steps that a height-adjustable tire fixing frame (2) is installed on a reaction frame (1), the tire fixing frame (2), a waste tire (3) and a load transfer piece (8) are fixedly connected into a whole through bolts, a vertical loading jack (11) is used for applying pressure to the load transfer piece (8), the tire fixing frame (2) is fixedly connected with the reaction frame (1) after vertical load is stabilized, a horizontal shearing displacement meter (18) is arranged in the sliding direction of a shearing box (4), and a first interface deformation micro-camera (20) is arranged outside the shearing box (4) and is opposite to a transparent side wall;
step S5: shear test:
the horizontal push-pull actuator (12) is used for applying stress to the shearing box (4) to carry out a shearing test, and test results obtained by the vertical force sensor (16), the horizontal force sensor (17), the horizontal shearing displacement meter (18), the vertical displacement meter (19), the first interface deformation micro-camera (20) and the second interface deformation micro-camera (21) are recorded.
2. The method for testing the shear characteristics of a horizontal interface between a waste tire and soil as claimed in claim 1, wherein in the step S1, the reaction frame (1) comprises a first supporting seat (1.1) and a second supporting seat (1.2) which are oppositely arranged up and down and an upright post (1.3) vertically arranged between the two supporting seats; the process of installing the servo loading system specifically comprises the following steps:
the vertical setting of vertical loading jack (11) is at the lower surface of first supporting seat (1.1), connects vertical loading jack (11) and hydraulic servo I (13) the upper surface of second supporting seat (1.2) is equipped with reaction wall (22), sets up horizontal push-and-pull actuator (12) level on reaction wall (22), connects horizontal push-and-pull actuator (12) and hydraulic servo II (14).
3. The method for testing the shear characteristics of the horizontal junked tire-soil interface as claimed in claim 2, wherein in step S2, the sliding device (5) comprises a first sliding slot (5.1) and a second sliding slot (5.2) which are oppositely arranged up and down, and a plurality of rolling elements (5.3) which are uniformly distributed between the two sliding slots at intervals, and the process of installing the sample system specifically comprises:
the second sliding groove (5.2) is fixedly arranged on the upper surface of the second supporting seat (1.2), the rolling bodies (5.3) are correspondingly embedded into the circular arc-shaped grooves of the second sliding groove (5.2), lubricating oil (5.4) is injected into the circular arc-shaped grooves, the first sliding groove (5.1) is fixedly arranged on the lower bottom surface of the shearing box (4), the position of the shearing box (4) is adjusted, the circular arc-shaped grooves of the first sliding groove (5.1) are attached to the surfaces of the rolling bodies (5.3), and meanwhile the plane center of the shearing box (4) is ensured to be positioned right below the power output shaft of the vertical loading jack (11) and the transparent side wall is not shielded.
4. The method for testing the shearing property of the horizontal interface between the waste tire and the soil as claimed in claim 3, wherein in the step S3, the load transferring member (8) comprises a plurality of load transferring cylinders (8.1) which are vertically arranged and evenly distributed along the circumferential direction of the annular base plate (7) at intervals and load transferring circular plates (8.2) arranged on the upper end surfaces of all the load transferring cylinders (8.1), and corresponding holes are arranged on the arc-shaped tire surfaces of the load transferring cylinders (8.1) and the waste tire (3); the process of installing the vertical load transfer system specifically comprises the following steps:
the method comprises the steps of placing an annular base plate (7) on the upper surface of a horizontal tread of a waste tire (3), placing a load transfer member (8) on the annular base plate (7), rotating the load transfer member (8) until holes in a load transfer cylinder (8.1) correspond to holes in the waste tire (3) one by one, placing a load transfer stiffening rib beam (9) on a load transfer circular plate (8.2), enabling the end part of the load transfer stiffening rib beam (9) to be pressed right above the load transfer cylinder (8.1), installing a pressure bearing disc (10) at the center of the top surface of the load transfer stiffening rib beam (9), and enabling a power output shaft of a vertical loading jack (11) to be connected with the top surface of the pressure bearing disc (10) in a centering manner.
5. The method for testing the shear characteristics of a horizontal interface between a waste tire and soil as claimed in claim 4, wherein in the step S3, the annular pad (7) is provided with a diagonal brace (25) extending towards the center; the process of installing the vertical displacement meter and the second interface deformation micro-camera specifically comprises the following steps:
a vertical displacement meter (19) is installed and debugged at the end part of the diagonal rod (25), a second interface deformation micro-camera (21) is installed and debugged at the center position of the bottom surface of the load transferring circular plate (8.2), so that a monitoring lens of the second interface deformation micro-camera (21) is over against the top surface of a soil body (6) in the inner ring range of the waste tire (3), and data lines of the vertical displacement meter (19) and the second interface deformation micro-camera (21) are connected out from a gap between the waste tire (3) and the load transferring piece (8).
6. The method for testing the shear characteristics of a horizontal interface between a waste tire and soil as claimed in claim 5, characterized in that in the step S4, the tire fixing frame (2) comprises a fixing frame (2.1), a quick-release lock catch (2.2) and a connecting piece (2.3), the fixed frame (2.1) can be movably arranged on the reaction frame (1) through the quick-release lock catch (2.2), a plurality of connecting pieces (2.3) are annularly and uniformly distributed on the fixed frame (2.1), the connecting piece (2.3) comprises a connecting rod (2.3.1) arranged along the radial direction of the waste tire (3) and a connector (2.3.2) positioned at the radial inner end of the connecting rod (2.3.1), the plurality of connectors (2.3.2) are matched to form a space for accommodating the waste tire (3), the connector (2.3.2) is provided with holes corresponding to the holes on the arc-shaped tread of the waste tire (3), the radial outer end of the connecting rod (2.3.1) is provided with a thread, and the fixed frame (2.1) is provided with a through hole corresponding to the connecting rod (2.3.1); the process of fixing the sample system specifically comprises:
correspondingly penetrating the radial outer end of the connecting rod (2.3.1) through a through hole in the fixed frame (2.1), adjusting the height position of the fixed frame (2.1) and the length of the radial outer end of the connecting rod (2.3.1) extending out of the through hole, enabling the connector (2.3.2) to be attached to the arc-shaped tire tread of the waste tire (3) and the hole position to be corresponding, inserting a bolt into corresponding holes in the connector (2.3.2), the arc-shaped tire tread of the waste tire (3) and the load transfer cylinder (8.1), and screwing the bolt to fixedly connect the connector (2.3.1), the arc-shaped tire tread of the waste tire (3) and the load transfer cylinder into a whole;
after the vertical load is stable, the connecting piece (2.3) is fixed on the fixing frame (2.1) by utilizing the nut, and the fixing frame (2.1) is fixed on the reaction frame (1) by utilizing the quick-release lock catch (2.2).
7. The method for testing the shearing property of the horizontal interface between the waste tires and the soil as claimed in claim 6, wherein in the step S4, an object placing plate (23) is arranged on the frame of the fixed frame (2.1) in the direction of the transparent side wall, the height of the object placing plane on the object placing plate (23) is lower than the upper surface of the soil body (6), and a supporting rod (24) extending towards the sliding direction of the shearing box (4) is arranged on the object placing plate (23); the process of installing the horizontal shear displacement meter and the first interface deformation microscopic camera specifically comprises the following steps:
a horizontal shearing displacement meter (18) is installed and debugged at the end part of a supporting rod (24), a first interface deformation micro-camera (20) is installed and debugged on a storage plate (23), and a monitoring lens of the first interface deformation micro-camera (20) is enabled to penetrate through a transparent side wall of a shearing box (4) and face the top surface of a soil body 6 in the outer ring range of a waste tire (3).
8. The method for testing the shear characteristics of the horizontal junked tire-soil interface of claim 7, wherein the magnitude of the vertical load applied in the step S4 is changed to simulate different burial depths.
9. The method for testing the shear characteristics of the horizontal waste tire-soil interface according to any one of claims 1 to 8, wherein the horizontal push-pull actuator (12) is an actuator with cyclic loading and unloading functions, and in the step S5, a cyclic reciprocating shear test is performed by the action of the horizontal push-pull actuator (12).
10. The method for testing the shear characteristics of the horizontal junked tire-soil interface as claimed in claim 9, wherein after the test is finished, the shear stress is unloaded through the horizontal push-pull actuator (12), the vertical stress is unloaded through the vertical loading jack (11), the data acquisition system is closed, the data line connected with the data acquisition system is pulled out, and the connecting bolts, the pressure-bearing disc (10), the load-transferring stiffening rib beam (9), the load-transferring member (8), the annular base plate (7), the junked tire (3) and the soil body (6) are sequentially removed.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114636667A (en) * | 2022-03-10 | 2022-06-17 | 长沙学院 | Junked tire-soil horizontal interface shearing characteristic testing device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114636667A (en) * | 2022-03-10 | 2022-06-17 | 长沙学院 | Junked tire-soil horizontal interface shearing characteristic testing device |
| CN114636667B (en) * | 2022-03-10 | 2024-05-31 | 长沙学院 | Junked tire-soil horizontal interface shear characteristic testing arrangement |
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