CN112730224A - Device and method for measuring friction coefficient of geotextile bag - Google Patents
Device and method for measuring friction coefficient of geotextile bag Download PDFInfo
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- 239000004746 geotextile Substances 0.000 title claims abstract description 158
- 238000000034 method Methods 0.000 title claims abstract description 21
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- 230000007246 mechanism Effects 0.000 claims description 78
- 238000001514 detection method Methods 0.000 claims description 37
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- 239000003638 chemical reducing agent Substances 0.000 claims description 27
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- G01N19/02—Measuring coefficient of friction between materials
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Abstract
The invention provides a device and a method for measuring a friction coefficient of a geotextile bag, which relate to the technical field of geotextiles in the civil engineering and water conservancy industries and comprise a test board, a base plate and a fixed structure; survey the one end and the base plate rotatable coupling of test panel, fixed knot constructs the setting and is surveying on the side of test panel keeping away from the base plate, a landing for prevent with the geotechnological fabric bag of the lower floor of surveying test panel direct contact, pile up two geotechnological fabric bags at the upper surface of survey test panel along vertical direction, the geotechnological fabric bag of lower floor passes through fixed knot structure and is surveyed the connection of test panel, then rotate and survey the test panel, because of the geotechnological fabric bag of lower floor passes through fixed knot structure and is connected with surveying test panel, thereby avoid it to take place the landing at survey test panel rotation in-process, when the geotechnological fabric bag of upper strata takes place to slide for the geotechnological fabric bag of lower floor, measure the angle between survey test.
Description
Technical Field
The invention relates to the technical field of geotextiles in the civil and water conservancy industries, in particular to a device and a method for measuring a friction coefficient of a geotextile bag.
Background
In recent years, geotextile materials have been rapidly developed due to continuous requirements of actual engineering, and become a novel geotechnical engineering material. The geotextile bags with the functions of reinforcing, draining and sand fixing are widely applied to the dam-piling technology of the large-scale tailing pond at present, the friction mechanical property of the interface between the geotextile bags is taken as an important technical index, and when the geotextile bags are used for carrying out the dam-piling of the tailing pond, the friction performance between the interfaces determines the stability of the dam body of the whole tailing pond.
In the prior art, a method for measuring the friction coefficient of the interface between geotextile bags is lacked, and the friction performance of the interface between geotextile bags is difficult to be accurately evaluated.
Disclosure of Invention
The invention aims to provide a device and a method for measuring the friction coefficient of a geotextile bag, which aim to solve the technical problem that the friction coefficient of an interface between geotextile bags is difficult to measure in the prior art.
The invention provides a device for measuring the friction coefficient of a geotextile bag, which comprises a test board, a substrate and a fixed structure, wherein the test board is arranged on the substrate;
one end of the test board is rotatably connected with the base board so that the test board can rotate relative to the test board, the fixed structure is arranged on the side face, far away from the base board, of the test board, and the fixed structure is used for preventing the geotextile bag on the lower layer from sliding off when the test board rotates relative to the base board.
Furthermore, the fixing structure comprises a stop block, wherein the stop block protrudes out of the upper surface of the test plate and extends along the width direction of the test plate.
Furthermore, the device for measuring the friction coefficient of the geotextile bag further comprises a sliding detection mechanism and a driving mechanism, wherein the driving mechanism is connected with the test board and is used for driving the test board to rotate relative to the base plate;
the sliding detection mechanism is arranged on the upper surface of the test board and is in communication connection with the driving mechanism.
Furthermore, the device for measuring the friction coefficient of the geotextile bag further comprises an angle detection mechanism, and the angle detection mechanism is used for detecting the rotation angle of the test board relative to the base plate.
Furthermore, the device for measuring the friction coefficient of the geotextile bag further comprises a controller, and the driving mechanism, the sliding detection mechanism and the angle detection mechanism are respectively connected with the controller.
Furthermore, the driving mechanism comprises a driving motor, a speed reducer, a screw rod, a sliding block and a supporting rod;
the output end of the driving motor is connected with the input end of the speed reducer, and the output end of the speed reducer is connected with the screw rod;
the screw rod extends along the length direction of the substrate, and the sliding block is in threaded connection with the screw rod;
one end of the supporting rod is hinged to the sliding block, and the other end of the supporting rod is hinged to the test board.
Furthermore, the driving mechanism further comprises a manual rotating wheel, a first clutch assembly and a second clutch assembly;
the driving motor is connected with the input end of the speed reducer through the first clutch assembly, and the first clutch assembly is used for connecting or disconnecting the driving motor with the input end of the speed reducer;
the manual rotating wheel is connected with the input end of the speed reducer through a second clutch assembly, and the second clutch assembly is used for connection or disconnection of the driving motor and the input end of the speed reducer.
Further, the driving mechanism further comprises a guide structure, the guide structure comprises a guide rail, and the guide rail extends along the length direction of the substrate;
the sliding block is provided with a sliding groove corresponding to the guide rail, and the guide rail is matched with the sliding groove and used for guiding the sliding block.
Further, a supporting seat is arranged on the substrate; the supporting seat is used for supporting the test board in a horizontal state.
The invention provides a method for measuring the friction coefficient of a geotextile bag, which comprises the following steps:
stacking two geotextile bags on a test board in a horizontal state along the vertical direction, and fixing the geotextile bags on the lower layer with the test board;
rotating the test board, and detecting the rotation angle of the test board when the upper geotextile bag slides relative to the lower geotextile bag;
and obtaining the friction coefficient between the two geotextile bags according to the rotation angle.
The invention provides a device for measuring the friction coefficient of a geotextile bag, which comprises a test board, a substrate and a fixed structure, wherein the test board is arranged on the substrate; one end of the test board is rotatably connected with the base board so that the test board can rotate relative to the test board, the fixed structure is arranged on the side face, far away from the base board, of the test board, and the fixed structure is used for preventing the geotextile bag on the lower layer from sliding off when the test board rotates relative to the base board.
During the in-service use, the survey test panel is in the horizontality, pile up two geotechnological fabric bags at the upper surface of surveying the test panel along vertical direction, wherein, the geotechnological fabric bag of lower floor is connected with surveying the test panel through fixed knot structure, then, rotate this survey test panel, so that survey the angle between test panel and the base plate and increase gradually, because of the geotechnological fabric bag of lower floor passes through fixed knot structure and is connected with surveying the test panel, thereby avoid it to take place the landing at survey test panel rotation in-process, when the geotechnological fabric bag of upper strata takes place to slide for the geotechnological fabric bag of lower floor, measure the angle between survey test panel and the base plate, can obtain the coefficient of friction.
The invention provides a method for measuring the friction coefficient of a geotextile bag, which comprises the following steps: stacking two geotextile bags on a test board in a horizontal state along the vertical direction, and fixing the geotextile bags on the lower layer with the test board; rotating the test plate, and detecting the rotation angle of the test plate when the upper geotextile bag slides relative to the lower geotextile bag; and obtaining the friction coefficient between the two geotextile bags according to the rotation angle.
Firstly, two geotextile bags are stacked on a test board along the vertical direction, the geotextile bags on the lower layer are fixed with the test board, then the test board is rotated, so that the two stacked geotextile bags and the test board rotate together, the geotextile bags on the lower layer are fixed with the test board, the geotextile bags cannot slide, when the geotextile bags on the upper layer slide relative to the geotextile bags on the lower layer, the rotation angle of the test board is recorded, the friction coefficient between the two geotextile bags is obtained according to the rotation angle, and the measuring method is simple and convenient.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a structural view of a device for measuring a friction coefficient of a geotextile bag according to an embodiment of the present invention;
fig. 2 is a partial view of a device for determining the coefficient of friction of a geotextile bag according to an embodiment of the present invention;
fig. 3 is a side view of a geotextile bag friction coefficient measuring device according to an embodiment of the present invention;
fig. 4 is a simplified diagram of calculating the friction coefficient between two geotextile bags of the geotextile bag friction coefficient measuring apparatus according to the embodiment of the present invention;
fig. 5 is a structural view of a friction coefficient measuring device for a geotextile bag according to an embodiment of the present invention in an initial state;
fig. 6 is a side view of an initial state of the geotextile bag friction coefficient measuring apparatus according to the embodiment of the present invention;
fig. 7 is a frame diagram of a device for measuring the coefficient of friction of a geotextile bag according to an embodiment of the present invention.
Icon: 100-a test board; 110-a stop block; 200-a substrate; 210-a support base; 310-a slip detection mechanism; 320-angle detection means; 330-a limiting mechanism; 400-a drive mechanism; 410-a drive motor; 420-a reducer; 430-a screw rod; 440-a slider; 450-a support bar; 460-a guide rail; 470-a shaft coupling; 480-a manual rotating wheel; 500-control cabinet; 510-a controller; 520-a display; 600-a mount; 700-geotextile bag.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 to 7, the geotextile bag 700 friction coefficient measuring device provided in the present invention comprises a test board 100, a base board 200 and a fixing structure; one end of the test plate 100 is rotatably coupled to the base plate 200 such that the test plate 100 can rotate relative to the test plate 100, and a fixing structure is disposed on a side of the test plate 100 away from the base plate 200 for preventing the geotextile bag 700 of the lower layer directly contacting the test plate 100 from slipping off when the test plate 100 rotates relative to the base plate 200.
In actual use, the test board 100 is in a horizontal state, two geotextile bags 700 are stacked on the upper surface of the test board 100 along a vertical direction, wherein the geotextile bag 700 at the lower layer is connected with the test board 100 through the fixing structure, then the test board 100 is rotated to gradually increase the angle between the test board 100 and the substrate 200, and the geotextile bag 700 at the lower layer is connected with the test board 100 through the fixing structure, so that the geotextile bag 700 at the lower layer is prevented from slipping off in the rotating process of the test board 100, when the geotextile bag 700 at the upper layer slides relative to the geotextile bag 700 at the lower layer, the angle between the test board 100 and the substrate 200 is measured, and the friction coefficient between the interfaces of the two geotextile bags 700 can be rapidly and accurately obtained through the angle, which is simple and convenient.
Specifically, in the present embodiment, the substrate 200 is fixedly connected to the upper end of the fixing frame 600, and the substrate 200 is in a horizontal state, and the initial state of the testing board 100 is parallel to the substrate 200, i.e. is also in a horizontal state. One end of the test board 100 is hinged to one end of the base board 200, and the test board 100 can be rotated relative to the base board 200 by rotating the other end of the test board 100.
As shown in fig. 4, which is a simplified calculation diagram of the friction coefficient between two geotextile bags 700, the conversion formula of the friction performance parameter between the geotextile bags 700 is calculated according to the following formula. As can be seen from the figures, it is,
coefficient of friction between layers
Wherein μ is the coefficient of friction; g is the weight of the geotextile bag 700 and α is the angle between the test board 100 and the substrate 200. By the aboveAs can be seen, in the embodiment, the friction coefficient is only related to the included angle between the test board 100 and the substrate 200, so that the friction coefficient between the two geotextile bags 700 can be obtained by detecting the rotation angle of the test board 100 relative to the substrate 200 and calculating the tangent value of the rotation angle.
Preferably, the rotation angle of the test board 100 with respect to the substrate 200 ranges from 0 ° to 60 °.
Further, the fixing structure includes a stop block 110, and the stop block 110 protrudes from the upper surface of the test board 100 and extends along the width direction of the test board 100.
Specifically, the fixing structure is used for fixing the geotextile bags 700 directly contacting with the test board 100 at the lower layer of the two geotextile bags 700 stacked on the upper surface of the test board 100 so as to prevent the test board 100 from slipping off in the rotating process, only the geotextile bags 700 at the lower layer are fixed, when the test board 100 rotates to a certain angle, the geotextile bags 700 at the upper layer slide relative to the geotextile bags 700 at the lower layer, the included angle between the test board 100 and the substrate 200 is detected, and the friction coefficient between the interfaces of the two geotextile bags 700 is obtained by calculating the tangent value of the included angle.
In this embodiment, the fixing structure includes the stop block 110, the position of the stop block 110 on the test board 100 is close to the hinge joint of the test board 100 and the base board 200, and the stop block protrudes from the upper surface of the test board 100, and extends along the width direction of the test board 100, the rotation angle of the test board 100 does not exceed 90 °, when in use, the bottom of the geotextile bag 700 on the lower layer can be abutted against the upper edge of the stop block, so as to prevent the geotextile bag 700 on the lower layer from sliding off, and the geotextile bag 700 on the upper layer is placed on the geotextile bag 700 on the lower layer.
It should be noted that the fixing structure may also be a hook and loop fastener disposed on the upper surface of the test board 100, which can stick the lower geotextile bag 700 to the end opposite to the test board 100, so as to prevent the geotextile bag 700 from moving. Other related structures for securing the lower geotextile bag 700 to the test panel 100 are also possible.
Further, the device for measuring the friction coefficient of the geotextile bag 700 further comprises a sliding detection mechanism 310 and a driving mechanism 400, wherein the driving mechanism 400 is connected with the test board 100 and is used for driving the test board 100 to rotate relative to the base board 200;
the sliding detection mechanism 310 is disposed on the upper surface of the test board 100, and the sliding detection mechanism 310 is communicatively connected to the driving mechanism 400.
Specifically, the driving mechanism 400 is connected to the test board 100, and can drive the test board 100 to rotate the test board 100 relative to the base board 200, and the sliding detection mechanism 310 is disposed on the upper surface of the test board 100 and is used for detecting whether the upper geotextile bag 700 slides relative to the upper geotextile bag 700. The sliding detection mechanism 310 is in communication connection with the driving mechanism 400, the driving mechanism 400 drives the test board 100 to rotate relative to the substrate 200, when the upper geotextile bag 700 slides relative to the lower geotextile bag 700, the sliding detection mechanism 310 triggers and sends a signal to the driving mechanism 400, and the driving mechanism 400 stops according to the signal, so that the test board 100 stays at a corresponding position, and an operator can conveniently detect the rotation angle.
It should be noted that the sliding detection mechanism 310 may be a travel switch or an infrared sensor, which may be disposed on the upper geotextile bag 700 sliding path on the upper surface of the test board 100, and when the upper geotextile bag 700 slides, the sliding detection mechanism 310 can be triggered. The sliding detection mechanism 310 may also be disposed at the middle of the above-mentioned stopper block 110, and the sliding detection mechanism 310 can detect when the upper geotextile bag 700 slides relative to the lower geotextile bag 700.
Further, the device for measuring the friction coefficient of the geotextile bag 700 further comprises an angle detection mechanism 320, and the angle detection mechanism 320 is used for detecting the rotation angle of the test board 100 relative to the base board 200.
Specifically, this angle detection mechanism 320 sets up in the articulated department of surveying test panel 100 and base plate 200 for detect the turned angle who surveys test panel 100, this angle detection can be angle encoder or corner sensor, can automated inspection turned angle information, avoids artifical measuring error, simultaneously, also conveniently realizes automatic survey.
Further, the device for measuring the friction coefficient of the geotextile bag 700 further comprises a controller 510, and the driving mechanism 400, the sliding detection mechanism 310 and the angle detection mechanism 320 are respectively connected with the controller 510.
The geotextile bag 700 friction coefficient measuring device can comprise a controller 510, wherein the driving mechanism 400, the sliding detection mechanism 310 and the angle detection mechanism 320 are respectively and electrically connected with the controller 510, the controller 510 can receive sliding information of the geotextile bag 700 on the upper layer detected by the sliding detection mechanism 310 and send a control instruction to the driving mechanism 400 to control the driving mechanism 400 to stop, and meanwhile, can also receive the rotation angle of the angle detection mechanism 320 test board 100 and obtain the friction coefficient between two geotextile bags 700 according to the rotation angle, and a corresponding logic program can be set in the controller 510 according to the formula to convert the rotation angle received by the controller 510 into the friction coefficient, thereby realizing automatic control.
Preferably, a display 520 may be further included, and the display 520 is connected to the controller 510 for displaying the rotation angle detected by the angle detection mechanism 320 and the friction coefficient between the two geotextile bags 700 calculated by the controller 510.
In this embodiment, the control cabinet 500 is further included, the control cabinet 500 includes a controller 510 and a display 520, wherein the display 520 is also connected to the controller 510, the angle detected by the angle detection mechanism 320 and the friction coefficient calculated by the controller 510 according to the above formula can be displayed, and an operator can directly read the angle and the friction coefficient from the display 520, which is convenient for operation.
Further, the driving mechanism 400 includes a driving motor 410, a reducer 420, a lead screw 430, a slider 440, and a support rod 450; the output end of the driving motor 410 is connected with the input end of the reducer 420, and the output end of the reducer 420 is connected with the screw rod 430; the lead screw 430 extends along the length direction of the substrate 200, and the slider 440 is in threaded connection with the lead screw 430; one end of the support rod 450 is hinged to the slider 440, and the other end of the support rod 450 is hinged to the test board 100.
Specifically, the lead screw 430 extends along the length direction of the substrate 200, and both ends of the lead screw 430 are connected with the substrate 200 through vertical bearings, the driving motor 410 and the speed reducer 420 are both disposed at the hinged position of the substrate 200, which is far away from the test board 100 and the substrate 200, wherein an output shaft of the driving motor 410 is connected with an input shaft of the speed reducer 420, an output shaft of the speed reducer 420 is connected with an end surface of the lead screw 430 through a coupler 470, so that the driving motor 410 can drive the lead screw 430 to rotate, the slider 440 is in threaded connection with the lead screw 430, when the lead screw 430 rotates, the slider 440 can move along the length direction of the lead screw 430, one end of the support rod 450 is hinged with the slider 440, the other end of the support rod 450 is hinged with the test board 100, and when the slider 440 moves along the length direction of.
In this embodiment, the number of the support rods 450 is two, one support rod 450 is located on one side of the width direction of the slider 440, the other support rod 450 is located on the other side of the width direction of the slider 440, and the two support rods 450 are mutually matched, so that the rotation of the test board 100 is more stable.
It should be noted that the coupling 470 for connecting the output shaft of the speed reducer 420 and the end of the lead screw 430 may be a quincunx jackscrew type coupling 470.
Preferably, the driving mechanism 400 further includes a limiting mechanism 330, and the limiting mechanism 330 is disposed on the substrate 200 and located on a side of the slider 440 far from the driving motor 410 for limiting a moving position of the slider 440. The limiting mechanism 330 may be electrically connected to the driving motor 410, and when the slider 440 triggers the limiting mechanism 330, the limiting mechanism 330 can send a signal to the driving motor 410, so as to control the driving motor 410 to stop rotating.
Further, the driving mechanism 400 further includes a manual wheel 480, a first clutch assembly and a second clutch assembly; the driving motor 410 is connected with the input end of the reducer 420 through a first clutch assembly, and the first clutch assembly is used for connecting or disconnecting the driving motor 410 with the input end of the reducer 420; the manual wheel 480 is connected to an input terminal of the decelerator 420 through a second clutch assembly for engaging or disengaging the driving motor 410 with or from the input terminal of the decelerator 420.
Preferably, the driving mechanism 400 may further include a manual wheel 480, the driving motor 410 is connected to the input end of the speed reducer 420 through a first clutch assembly, the manual wheel 480 is connected to the input end of the speed reducer 420 through a second clutch assembly, when the first clutch assembly is engaged, the second clutch assembly is disengaged, and when the second clutch assembly is engaged, the first clutch assembly is disengaged, so that the driving mechanism 400 may implement a driving manner in which the driving motor 410 provides power, and may also implement a driving manner in which the manual wheel 480 provides power, so as to adapt to different working conditions, that is, when there is electric power, the driving motor 410 may be used for driving, and when there is no electric power, the manual wheel 480 may be used for driving.
Electric drive mode: firstly, a sample is filled according to the size requirement of the geotextile bag 700, the sample can be sand, two stacked geotextile bags 700 filled with the sample are sequentially placed on the upper surface of the test board 100, wherein the geotextile bag 700 on the lower layer is blocked by a stop plate, the driving motor 410 is started, power is transmitted to the screw rod 430 through the reducer 420, the screw rod 430 drives the slider 440 to move along the length direction of the base board 200 and pushes the test board 100 to rotate through the support rod 450, meanwhile, the angle mechanism is used for recording the rotation angle of the test board 100 relative to the base board 200 in real time, when the geotextile bag 700 on the upper layer slides relative to the geotextile bag 700 on the lower layer, the sliding detection mechanism 310 is triggered and sends a signal to the controller 510, the controller 510 controls the driving mechanism 400 to stop, at this time, the angle detection mechanism 320 transmits the angle information to the controller 510, the controller 510 performs calculation according to the, the coefficient of friction between the two geotextile bags 700 is calculated, and after the detection is completed, the controller 510 can send a signal to the driving mechanism 400 to control the driving mechanism 400 to drive the test board 100 to reset.
A manual driving mode; the step of placing geotextile bags 700 is the same as the above-mentioned automatic driving method, and when the device is performed in a construction site or an environment where the electric driving cannot be provided, the electric testing mode can be switched to the manual testing mode by switching the first clutch assembly and the second clutch assembly, the manual wheel 480 is rotated at a constant speed with a constant force to provide power for the lead screw 430, the manual wheel 480 is rotated by a handle thereon, a fixed reading disc can be arranged inside, while outputting power to the decelerator 420, the fixed reading disc inside the decelerator also rotates, records the rotation angle, the rotation angle can be converted to the rotation angle of the test board 100, and when there is a relative sliding between the upper geotextile bag 700 and the lower geotextile bag 700, and stopping rotating the manual rotating wheel 480, reading the reading displayed by the fixed reading disc at the moment, and calculating the interface friction coefficient of the geotextile bag 700 according to the corresponding conversion relation.
It should be noted that, the first clutch assembly and the second clutch assembly may adopt corresponding clutch assemblies in the prior art, may adopt manual control, may also adopt automatic control, and here is not limited, and it is enough to realize mutual switching.
Preferably, the driving mechanism 400 further includes a guide structure including a guide rail 460, the guide rail 460 extending along a length direction of the base plate 200; the sliding block 440 is provided with a sliding groove corresponding to the guide rail 460, and the guide rail 460 is matched with the sliding groove for guiding the sliding block 440.
Specifically, in this embodiment, the guiding structure includes two parallel guide rails 460, the two guide rails 460 both extend along the length direction of the base plate 200, one guide rail 460 is disposed on one side of the lead screw 430, the other guide rail 460 is disposed on the other side of the lead screw 430, a sliding slot corresponding to the guide rail 460 is disposed on the sliding block 440, and the guide rail 460 is matched with the sliding slot for precise guiding of the sliding block 440.
Further, a support base 210 is disposed on the substrate 200; the supporting base 210 is used for supporting the test board 100 in a horizontal state.
Specifically, two supporting seats 210 may be disposed on the plate, one of the two supporting seats is located on one side of the screw 430, the other is located on the opposite side of the screw 430, and the two supporting seats 210 are used for supporting one end of the test board 100 far away from the end hinged to the substrate 200 when the test board 100 is in a horizontal state, so as to prevent the test board 100 from being deformed due to a cantilever state for a long time.
The method for measuring the friction coefficient of the geotextile bag 700, which is provided by the invention, can utilize the device for measuring the friction coefficient of the geotextile bag 700, and specifically comprises the following steps:
first, two geotextile bags 700 are stacked in a vertical direction on the test board 100 in a horizontal state, and the geotextile bag 700 of the lower layer is fixed to the test board 100.
Next, the test board 100 is rotated to detect the rotation angle of the test board 100 when the upper geotextile bag 700 slides relative to the lower geotextile bag 700.
Finally, the coefficient of friction between the two geotextile bags 700 is obtained according to the rotation angle.
In the method for measuring the friction coefficient of the geotextile bag 700 provided by this embodiment, firstly, two geotextile bags 700 are stacked on the test board 100 along the vertical direction, the geotextile bag 700 on the lower layer is fixed with the test board 100, and then the test board 100 is rotated to enable the two geotextile bags 700 stacked with the test board 100 to rotate together, because the geotextile bag 700 on the lower layer is fixed with the test board 100, the geotextile bag 700 on the lower layer does not slide off, when the geotextile bag 700 on the upper layer slides relative to the geotextile bag 700 on the lower layer, the rotation angle of the test board 100 is recorded, the friction coefficient between the two geotextile bags 700 is obtained according to the rotation angle, and the measuring method is simple and convenient.
Specifically, before the step of obtaining the friction coefficient between the two geotextile bags 700 from the rotation angle, the rotation angle may be measured several times to obtain an average value of the measured rotation angles, and then the friction coefficient between the two geotextile bags 700 may be calculated from the average value.
In summary, the device for measuring the friction coefficient of the geotextile bag 700 provided by the invention comprises a test board 100, a substrate 200 and a fixing structure; one end of the test plate 100 is rotatably coupled to the base plate 200 such that the test plate 100 can rotate relative to the test plate 100, and a fixing structure is disposed on a side of the test plate 100 away from the base plate 200 for preventing the geotextile bag 700 of the lower layer directly contacting the test plate 100 from slipping off when the test plate 100 rotates relative to the base plate 200. In actual use, the test board 100 is in a horizontal state, two geotextile bags 700 are stacked on the upper surface of the test board 100 along a vertical direction, wherein the geotextile bag 700 at the lower layer is connected with the test board 100 through the fixing structure, then the test board 100 is rotated to gradually increase the angle between the test board 100 and the substrate 200, and the geotextile bag 700 at the lower layer is connected with the test board 100 through the fixing structure, so that the geotextile bag 700 at the lower layer is prevented from slipping off in the rotating process of the test board 100, when the geotextile bag 700 at the upper layer slides relative to the geotextile bag 700 at the lower layer, the angle between the test board 100 and the substrate 200 is measured, and the friction coefficient between the interfaces of the two geotextile bags 700 can be rapidly and accurately obtained through the angle, which is simple and convenient.
The invention provides a method for measuring the friction coefficient of a geotextile bag 700, which comprises the following steps: stacking two geotextile bags 700 on the test board 100 in a horizontal state in a vertical direction, and fixing the geotextile bag 700 at the lower layer with the test board 100; rotating the test board 100, when the upper geotextile bag 700 slides relative to the lower geotextile bag 700, detecting the rotation angle of the test board 100; the coefficient of friction between the two geotextile bags 700 is obtained according to the rotation angle. Firstly, two geotextile bags 700 are stacked on a test board 100 along the vertical direction, the geotextile bag 700 at the lower layer is fixed with the test board 100, then the test board 100 is rotated to enable the two stacked geotextile bags 700 to rotate together with the test board 100, the geotextile bag 700 at the lower layer is fixed with the test board 100 and cannot slide, when the geotextile bag 700 at the upper layer slides relative to the geotextile bag 700 at the lower layer, the rotation angle of the test board 100 is recorded, the friction coefficient between the two geotextile bags 700 is obtained according to the rotation angle, and the measuring method is simple and convenient.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The device for measuring the friction coefficient of the geotextile bag is characterized by comprising a test board, a base plate and a fixing structure;
one end of the test board is rotatably connected with the base board so that the test board can rotate relative to the test board, the fixed structure is arranged on the side face, far away from the base board, of the test board, and the fixed structure is used for preventing the geotextile bag on the lower layer from sliding off when the test board rotates relative to the base board.
2. The geotextile bag friction coefficient measuring device of claim 1, wherein the fixing structure comprises a stopper protruding from the upper surface of the test panel and extending in the width direction of the test panel.
3. The geotextile bag friction coefficient measuring device of claim 1, further comprising a sliding detection mechanism and a driving mechanism, wherein the driving mechanism is connected with the test plate and is used for driving the test plate to rotate relative to the base plate;
the sliding detection mechanism is arranged on the upper surface of the test board and is in communication connection with the driving mechanism.
4. The geotextile bag friction coefficient measuring device of claim 3, further comprising an angle detecting mechanism for detecting a rotation angle of the test board relative to the base plate.
5. The geotextile bag friction coefficient measuring device as claimed in claim 4, wherein the geotextile bag friction coefficient measuring device further comprises a controller, and the driving mechanism, the sliding detection mechanism and the angle detection mechanism are respectively connected with the controller.
6. The geotextile bag friction coefficient measuring device as claimed in claim 3, wherein the driving mechanism comprises a driving motor, a reducer, a screw rod, a slide block and a support rod;
the output end of the driving motor is connected with the input end of the speed reducer, and the output end of the speed reducer is connected with the screw rod;
the screw rod extends along the length direction of the substrate, and the sliding block is in threaded connection with the screw rod;
one end of the supporting rod is hinged to the sliding block, and the other end of the supporting rod is hinged to the test board.
7. The geotextile bag friction coefficient measuring device of claim 6, wherein the drive mechanism further comprises a manual wheel, a first clutch assembly, and a second clutch assembly;
the driving motor is connected with the input end of the speed reducer through the first clutch assembly, and the first clutch assembly is used for connecting or disconnecting the driving motor with the input end of the speed reducer;
the manual rotating wheel is connected with the input end of the speed reducer through a second clutch assembly, and the second clutch assembly is used for connection or disconnection of the driving motor and the input end of the speed reducer.
8. The geotextile bag friction coefficient measuring device of claim 6, wherein the driving mechanism further comprises a guide structure, the guide structure comprises a guide rail, and the guide rail extends along the length direction of the base plate;
the sliding block is provided with a sliding groove corresponding to the guide rail, and the guide rail is matched with the sliding groove and used for guiding the sliding block.
9. The geotextile bag friction coefficient measuring device of any one of claims 1-8, wherein the base plate is provided with a support seat; the supporting seat is used for supporting the test board in a horizontal state.
10. The method for measuring the friction coefficient of the geotextile bag is characterized by comprising the following steps of:
stacking two geotextile bags on a test board in a horizontal state along the vertical direction, and fixing the geotextile bags on the lower layer with the test board;
rotating the test board, and detecting the rotation angle of the test board when the upper geotextile bag slides relative to the lower geotextile bag;
and obtaining the friction coefficient between the two geotextile bags according to the rotation angle.
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| CN2102512U (en) * | 1991-09-28 | 1992-04-22 | 山东省纺织科学研究所 | Measuring instrument for fabric friction coefficient |
| CN202372438U (en) * | 2011-12-14 | 2012-08-08 | 温州职业技术学院 | Differential friction coefficient tester |
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