CN215262895U - Multi-functional creep test device of geosynthetic material - Google Patents
Multi-functional creep test device of geosynthetic material Download PDFInfo
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- CN215262895U CN215262895U CN202120524770.1U CN202120524770U CN215262895U CN 215262895 U CN215262895 U CN 215262895U CN 202120524770 U CN202120524770 U CN 202120524770U CN 215262895 U CN215262895 U CN 215262895U
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Abstract
The utility model discloses a multi-functional creep test device of geosynthetic material belongs to geosynthetic material test technical field. The test bed comprises a bearing table, wherein a plurality of adjusting pins are arranged at the bottom of the bearing table, a control table is arranged at one end of the top surface of the bearing table, a test box is arranged between a fixing frame and the control table, a lower test box is arranged at the top of the bearing table, an upper test box is arranged at the top of the lower test box, test fillers are filled in the upper test box and the lower test box, and a vertical loading system is arranged at the top of the upper test box; the test box is characterized in that a high-low temperature heat insulation system is arranged on the outer side of the test box and comprises a temperature control element, a temperature monitoring element and a high-low temperature heat insulation box, the temperature control element and the temperature monitoring element are arranged in the high-low temperature heat insulation box, and the temperature control element is used for setting the temperature inside the test box. The utility model discloses can carry out the creep experiment under different temperature environment.
Description
Technical Field
The utility model belongs to the technical field of the geosynthetic material is experimental, especially a multi-functional creep test device of geosynthetic material.
Background
The geosynthetic material is a novel building material applied to civil engineering, generally requires long service life, large bearing load and can bear the severe engineering environment, so that the geosynthetic material has certain requirements on physical properties and certain requirements on weather resistance, chemical resistance and the like. One of the important roles of geosynthetics in construction is reinforcement engineering, creep being the key to whether the tensile strength of a geosynthetic material can function for a long period of time. The temperature of the contact surface of the geosynthetic material and the soil body changes along with seasonal changes, the influence of the temperature on the creep property of the geosynthetic material is also a concern of students, and the creep effect of the temperature on the geosynthetic material cannot be fully considered by the conventional creep tester at present.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a multi-functional creep test device of geosynthetic material can carry out the creep experiment under different temperature environment.
In order to achieve the above purpose, the utility model adopts the technical proposal that:
a multifunctional creep test device for geosynthetics comprises a bearing table, wherein a plurality of adjusting pins are arranged at the bottom of the bearing table, a control table is arranged at one end of the top surface of the bearing table, a fixing frame is arranged at the other end of the top surface of the bearing table, a test box is arranged between the fixing frame and the control table and comprises an upper test box and a lower test box, the lower test box is arranged at the top of the bearing table and is mounted at the top of the lower test box, test fillers are filled in the upper test box and the lower test box, and a vertical loading system is arranged at the top of the upper test box;
the high-low temperature heat preservation system is arranged on the outer side of the test box and comprises a temperature control element, a temperature monitoring element and a high-low temperature heat preservation box, wherein the temperature control element and the temperature monitoring element are arranged in the high-low temperature heat preservation box, the temperature control element is used for setting the temperature inside the test box, and the temperature monitoring element is used for monitoring the temperature inside the test box.
Further, still include the computer, the computer is located on the control cabinet, the computer with the control cabinet is connected.
Further, go up the test box and include the last test box of a plurality of specifications for carry out the vertical loading test of different angles, vertical loading system includes fixed hydraulic servo jack, universal bulb, bearing plate, angular adjustment push rod and first sensor, the fixed bolster is located the one end that the bearing platform top surface is close to the mount support, the bearing plate is located go up test box top, universal bulb is located the bearing plate top, hydraulic servo jack's one end is articulated with universal head, the one end of angular adjustment push rod is articulated with hydraulic servo jack, and the other end is articulated with the mount top, first sensor set up in hydraulic servo jack for the pressure that control hydraulic servo jack produced.
Further, the upper end and the lower extreme of going up test box and lower test box all are equipped with the opening, and when last test box was connected with lower test box, the relative both sides of going up test box bottom along bearing platform length direction are equipped with the slot, the both sides of test box are equipped with front end anchor clamps and rear end anchor clamps respectively down, front end anchor clamps and rear end anchor clamps are used for the centre gripping to pass the slot geosynthetic material.
Further, still include horizontal loading system, horizontal loading system includes horizontal force application device, application of force telescopic link and second sensor, horizontal force application device locates in the control cabinet, the one end and the horizontal force application device of application of force telescopic link are connected, and the other end is connected with one side that the front end anchor clamps are close to the control cabinet, and the second sensor is located on the application of force telescopic link for the pressure that control application of force telescopic link produced.
The geosynthetic material testing device is characterized by further comprising a strain acquisition system, wherein the strain acquisition system comprises a displacement sensor support, a displacement sensor and a steel strand, the displacement sensor support is arranged between the fixing frame and the lower testing box, the displacement sensor is arranged on the displacement sensor support, one end of the steel strand is connected with the displacement sensor, the other end of the steel strand penetrates through a narrow slit at the bottom of the upper testing box and is connected with a preset measuring point on the geosynthetic material, and the number of the displacement sensors is more than two.
Furthermore, the high-low temperature insulation can is divided into an upper box body and a lower box body, the two box bodies are detachably connected, the upper box body comprises a plurality of upper box bodies corresponding to the upper test boxes, and holes are formed in the two opposite sides of the lower box body along the length direction of the bearing table.
Further, vertical loading system still includes the reaction frame, the reaction frame sets up the connecting rod including vertical bracing piece and the level that sets up, the one end of bracing piece is articulated with one side of bearing platform, and the other end is articulated with the connecting rod, the one end and the hydraulic servo jack fixed connection of bracing piece are kept away from to the connecting rod, the bracing piece is the telescopic link, be equipped with its flexible locking bolt of locking on the bracing piece.
Furthermore, the front end clamp is formed by connecting a front end clamp upper clamp plate, a front end clamp middle clamp plate and a front end clamp lower clamp plate through bolts, wherein tooth-shaped occlusion grooves are formed in the bottom surface of the front end clamp middle clamp plate and the top surface of the front end clamp lower clamp plate, and a rubber cushion is placed in each occlusion groove.
Due to the adoption of the technical scheme, the utility model discloses following beneficial effect has:
1. the utility model discloses a high low temperature insulation can is installed in the test box outside can set for the temperature in the test box through the insulation can to can carry out the creep experiment in the temperature environment of difference.
2. The utility model discloses a pressurized cylinder angle adjusting rod adjusts the angle of vertical load to can carry out the loading experiment at different inclinations, be favorable to the multi-scene to study geosynthetic material's creep performance
Drawings
FIG. 1 is a front view of a geosynthetic multifunctional creep test device with a vertical load application direction inclined by 0 degrees;
FIG. 2 is a front view of the geosynthetic multifunctional creep test device with a vertical load application direction inclined by 20 degrees;
FIG. 3 is a top view of the geosynthetic multifunctional creep test device with a vertical load application direction inclined by 0 degrees;
fig. 4 is a front view, a left side view and a right side view (from left to right) of the test box of the geosynthetic material multifunctional creep test device when the vertical load acting direction is inclined by 0 degree;
FIG. 5 is a front view, top view (from left to right) of the front end clamp;
FIG. 6 is a front view, a top view and a right side view (from left to right) of the rear end clamp;
fig. 7 is a left side view and a right side view (from left to right) of the high and low temperature incubator when the vertical load action direction of the geosynthetic material multifunctional creep test device is inclined by 0 degree.
In the drawings, there is shown in the drawings,
the device comprises a computer (1), a control console (2), an expansion link (3), a reaction frame (4), a hydraulic servo jack (5), a first sensor (6), a universal ball head (7), a bearing plate (8), a pressurizing cylinder angle adjusting push rod (9), a displacement sensor (10), a fixed support (11), a support (12) of the displacement sensor, a steel strand (13), a geosynthetic material (14), a preset measuring point (15) on the geosynthetic material, a test filler (16), a high-low temperature incubator (17), a second sensor (18), a bearing table (19), an adjusting foot (20), a front end clamp (21), an upper clamp plate (21-1) of the front end clamp, a middle clamp plate (21-2) of the front end clamp, a lower clamp plate (21-3) of the front end clamp, a base (22) between the front end clamp and a sliding wheel, a sliding wheel (23), The test device comprises a rear end clamp (24), an upper clamping plate (24-1) of the rear end clamp, a middle clamping plate (24-2) of the rear end clamp, a lower clamping plate (24-3) of the rear end clamp, an upper test box (25-1) of the test box, a lower test box (25-2), a narrow gap (26) between the upper test box and the lower test box, a temperature control element (27), a hole I (28) and a hole II (29).
Detailed Description
The following detailed description of the present invention is provided in conjunction with the accompanying drawings, but it should be understood that the scope of the present invention is not limited by the following detailed description.
Throughout the specification and claims, unless explicitly stated otherwise, the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element or component but not the exclusion of any other element or component.
The utility model provides a pair of multi-functional creep test device of geosynthetic material, including bearing platform, test box, high low temperature heat preservation system, strain collection system, horizontal loading system, vertical loading system, angle modulation push rod, computer control system.
The bearing table (19) provides a placing space and an operating platform for the device required by the test;
the test sample box (25) comprises an upper test sample box (25-1) and a lower test sample box (25-2), the upper test sample box and the lower test sample box are connected through bolts, the front end clamp (21) and the rear end clamp (24) clamp geosynthetic material (14) samples at two ends of the test sample box, the rear end clamp (24) is fixed on the lower test sample box (25-2), the front end clamp (21) is connected with the telescopic rod (3), and horizontal constant tension is provided through a horizontal force application device arranged in the left control console (2);
the high-low temperature heat preservation system comprises a temperature control element (27) and a high-low temperature heat preservation box (17) and is used for setting and maintaining the temperature in the test box, the high-low temperature heat preservation box (17) is positioned outside the test box, holes I (28) and holes II (29) are reserved at two ends of the heat preservation box, and a steel strand (13) of the strain acquisition system and a telescopic rod (3) for transmitting horizontal tension can penetrate through the holes;
the strain acquisition system comprises a displacement sensor (10) and a steel strand (13), wherein the displacement sensor (10) and the steel strand (13) can be replaced, so that abrasion in a long-term test is avoided, and the accuracy of a test result can be ensured;
the horizontal loading system comprises a horizontal force application device, a telescopic rod (3) and a second sensor (18), wherein the horizontal force application device provides constant horizontal load for the geosynthetic material (14) sample, and is placed in the console (2);
vertical loading system, including reaction frame (4), hydraulic servo jack (5), first sensor (6), universal bulb (7), bearing plate (8), for experimental required normal load that provides, wherein hydraulic servo jack (5) are fixed to reaction frame (4) one end, and the other end is connected through the hinged-support, and the purpose is when pressurized cylinder angular adjustment push rod (9) are flexible then rotates together, supports hydraulic servo jack (5) simultaneously together and makes it remain stable.
Angle modulation push rod (9) can change the angle between vertical load effect direction and the vertical direction through the regulation to the realization is studied the geosynthetic material creep property under the different angles.
The computer control system comprises a computer (1) and a software system, and controls the output size of the horizontal load and the vertical load and records the creep displacement value acquired by the displacement sensor through software;
as shown in fig. 5-6, fig. 5 is a front view and a top view (from left to right) of the front end clamp (21), wherein the front end clamp (21) is composed of an upper clamping plate, a middle clamping plate and a lower clamping plate, the three clamping plates are fixed by bolts, the upper clamping plate passes through the middle clamping plate and is connected with the lower clamping plate by 2 bolts, tooth-shaped engagement grooves are respectively arranged on the matched clamping surfaces of the middle clamping plate and the lower clamping plate, rubber gaskets are arranged on the tooth-shaped engagement grooves for clamping the geosynthetic material (14), and the front end clamp (21) is connected with the sliding wheel (23) by a base (22) between the sliding wheel and the front end clamp. Fig. 6 is a front view, a top view and a right side view (from left to right) of the rear end clamp (24), wherein the rear end clamp (24) is composed of an upper clamp plate, a middle clamp plate and a lower clamp plate, the three clamp plates are fixed by bolts, the upper clamp plate passes through the middle clamp plate by 2 bolts to be connected with the lower clamp plate, tooth-shaped occlusion grooves are respectively arranged on the matched clamping surfaces of the middle clamp plate and the lower clamp plate, rubber gaskets are arranged on the tooth-shaped occlusion grooves to clamp the geosynthetic material (14), and the rear end clamp (24) is fixed on a lower box (25-2) of the test box.
Fig. 7 is a left side view and a right side view (from left to right) of the high and low temperature incubator when the vertical load acting direction of the geosynthetic material multifunctional creep test device is inclined by 0 degree, wherein the temperature control element (27) is used for setting the temperature inside the test box, and the holes i (28) and ii (29) on the left and right sides are used for allowing the steel strand (13) of the strain acquisition system and the telescopic rod (3) for transmitting horizontal tension to pass through;
furthermore, the utility model also provides a geosynthetic material high low temperature creep appearance's test method, include:
and 6, analyzing results, namely calculating the displacement of different preset measuring points on the geosynthetic material collected by the displacement sensor (10) through a strain formula to obtain a strain value of the geosynthetic material (14) corresponding to the preset measuring points:
ε＝(Δx/x)×100％
in the formula: epsilon is strain capacity of the reinforcement; delta x is creep deformation mm of the rib material; and x is the effective length of the rib material, namely the net distance mm between the clamps.
The utility model discloses carry out experimental concrete step as follows:
(1) selecting a corresponding upper test box (25-1) and a high-low temperature heat preservation box (17) corresponding to the upper test box according to different angles formed between the vertical load acting direction and the vertical direction, preparing test fillers (16) and geosynthetics (14) required by the test, connecting preset measuring points (15) on the geosynthetics with steel strands (13) of a displacement sensor (10), debugging equipment until the test requirements are met, and measuring the ultimate tensile strength Tmax of the selected geosynthetics (14);
(2) and sample installation: opening a computer (1) and an oil valve switch of a hydraulic servo jack (5), raising the hydraulic servo jack (5) to the highest point through the computer (1), adjusting an angle theta between a vertical load action direction and the vertical direction, wherein the theta is 0-60 degrees, installing a corresponding test box upper box (25-1) and a high-low temperature insulation box (17) according to the angle between the vertical load action direction and the vertical direction, opening the high-low temperature insulation box (17) before sample installation, filling soil samples in layers and compacting, wherein the filling soil in each layer does not exceed 10cm, placing a geosynthetic material (14) sample when a soil body is filled to the box top of a test box lower box (25-2), placing the left side of the sample between a middle clamping plate (21-2) and a lower clamping plate (21-3) of a front-end clamp (21), fixing the left side of the sample through bolts, and placing the right side of the sample between a middle clamping plate (24) of the rear-end clamp (24) of the test box lower box (25-2) -2) and a lower clamping plate (24-3) of the rear end clamp are fixed through bolts, preset measuring points (15) on the geosynthetic material are connected with a displacement sensor (10) through steel strands (13), upper soil bodies are continuously filled after the geosynthetic material (14) and the displacement sensor (10) are installed, and after the soil bodies are filled, a hydraulic servo jack (5) is slowly descended through a computer (1) and is in contact with the soil bodies through a bearing plate (8);
(3) and installing a high-low temperature heat preservation box: closing the high-low temperature heat preservation box (17), connecting the high-low temperature heat preservation box with a power supply, opening the high-low temperature heat preservation box, and setting a target temperature;
(4) carrying out test loading, namely placing the installed test equipment at a target temperature for standing for 0.5-1 day, wherein the target temperature is 10-80 ℃; applying a vertical load P vertical to the geosynthetic material (14) on a test filler (16) at the top of an upper box (25-1) of the test box through a vertical loading system, wherein the vertical load is 0-300 kPa; the horizontal load applied to the front-end clamp (22) by the horizontal loading system is N% of the ultimate tensile strength Tmax of the geosynthetic material (14), the loading time is 1000h, and the displacement of different preset measuring points on the geosynthetic material, which is acquired by the displacement sensor (10), is led out through the computer (1);
(5) repeating the step 1-4 at least twice, wherein the horizontal load applied to the front end clamp (21) by the horizontal loading system in each test is increased by n percent on the basis of the ultimate tensile strength Tmax horizontal load value of the geosynthetic material (14) at the last time, wherein n is 10 percent, and the displacement of different preset measuring points on the geosynthetic material, which is collected by the displacement sensor (10), is led out by the computer (1);
(6) and analyzing results, namely calculating the displacement of different preset measuring points on the geosynthetic material collected by the displacement sensor (10) through a strain formula to obtain strain values of the geosynthetic material (14) on the corresponding preset measuring points:
ε＝(Δx/x)×100％
in the formula: epsilon is strain capacity of the reinforcement; delta x is creep deformation mm of the rib material; and x is the effective length of the rib material, namely the net distance mm between the clamps.
The above description is for the detailed description of the preferred embodiments of the present invention, but the embodiments are not intended to limit the scope of the present invention, and all equivalent changes or modifications accomplished under the technical spirit of the present invention should belong to the scope of the present invention.
Claims (9)
1. The multifunctional creep test device for the geosynthetic materials is characterized by comprising a bearing table, wherein a plurality of adjusting pins are arranged at the bottom of the bearing table, a control table is arranged at one end of the top surface of the bearing table, a fixing frame is arranged at the other end of the top surface of the bearing table, a test box is arranged between the fixing frame and the control table and comprises an upper test box and a lower test box, the lower test box is arranged at the top of the bearing table and is installed at the top of the lower test box, test fillers are filled in the upper test box and the lower test box, and a vertical loading system is arranged at the top of the upper test box;
the high-low temperature heat preservation system is arranged on the outer side of the test box and comprises a temperature control element, a temperature monitoring element and a high-low temperature heat preservation box, wherein the temperature control element and the temperature monitoring element are arranged in the high-low temperature heat preservation box, the temperature control element is used for setting the temperature inside the test box, and the temperature monitoring element is used for monitoring the temperature inside the test box.
2. The multi-functional creep test apparatus for geosynthetics of claim 1 further comprising a computer, wherein the computer is disposed on the console, and wherein the computer is connected to the console.
3. The multi-functional creep test apparatus of geosynthetic material of claim 2 wherein the upper test box comprises a plurality of gauges of upper test box, used for carrying out vertical loading tests at different angles, the vertical loading system comprises a fixed hydraulic servo jack, a universal ball head, a bearing plate, an angle adjusting push rod and a first sensor, the fixing frame is arranged at one end of the top surface of the bearing table close to the support of the fixing frame, the bearing plate is arranged at the top of the upper test box, the universal ball head is arranged at the top of the bearing plate, one end of the hydraulic servo jack is hinged with the universal head, one end of the angle adjusting push rod is hinged with the hydraulic servo jack, the other end is hinged with the top of the fixed frame, the first sensor is arranged on the hydraulic servo jack and used for monitoring pressure generated by the hydraulic servo jack.
4. The multifunctional creep test device for geosynthetics of claim 1 wherein the upper and lower ends of the upper and lower test boxes are each provided with an opening, and when the upper and lower test boxes are connected, the bottom end of the upper test box is provided with slits along opposite sides of the length direction of the load-bearing platform, and the lower test box is provided with front and rear clamps on opposite sides thereof, respectively, for clamping the geosynthetics passing through the slits.
5. The multifunctional creep test device for geosynthetics of claim 4 further comprising a horizontal loading system, wherein the horizontal loading system comprises a horizontal force application device, a force application telescopic rod and a second sensor, the horizontal force application device is disposed in the console, one end of the force application telescopic rod is connected with the horizontal force application device, the other end of the force application telescopic rod is connected with one side of the front end fixture close to the console, and the second sensor is disposed on the force application telescopic rod and used for monitoring the pressure generated by the force application telescopic rod.
6. The multifunctional creep test device for geosynthetics of claim 1, further comprising a strain acquisition system, wherein the strain acquisition system comprises a displacement sensor support, a displacement sensor and a steel strand, the displacement sensor support is arranged between the fixed frame and the lower test box, the displacement sensor is arranged on the displacement sensor support, one end of the steel strand is connected with the displacement sensor, the other end of the steel strand penetrates through a narrow slit at the bottom of the upper test box to be connected with a preset test point on the geosynthetics, and the number of the displacement sensors is more than two.
7. The multifunctional creep test device for geosynthetics of claim 3 wherein the high and low temperature thermal insulation box is divided into an upper box and a lower box, the two boxes are detachably connected, the upper box comprises a plurality of upper boxes corresponding to the upper test boxes, and the lower box is provided with holes along opposite sides of the length direction of the bearing table.
8. The multifunctional creep test device for geosynthetics of claim 3, wherein the vertical loading system further comprises a reaction frame, the reaction frame comprises a vertically-arranged support rod and a horizontally-arranged connecting rod, one end of the support rod is hinged to one side of the bearing platform, the other end of the support rod is hinged to the connecting rod, one end of the connecting rod, far away from the support rod, is fixedly connected with the hydraulic servo jack, the support rod is a telescopic rod, and a locking bolt for locking the telescopic rod is arranged on the support rod.
9. The multifunctional creep test device for geosynthetics of claim 4 wherein the front clamp is formed by connecting an upper front clamp plate, a middle front clamp plate and a lower front clamp plate by bolts, wherein the bottom surface of the middle front clamp plate and the top surface of the lower front clamp plate are provided with toothed engaging grooves, and rubber pads are placed in the engaging grooves.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113049399A (en) * | 2021-03-12 | 2021-06-29 | 广西科技大学 | Geosynthetic material multifunctional creep tester and test method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113049399A (en) * | 2021-03-12 | 2021-06-29 | 广西科技大学 | Geosynthetic material multifunctional creep tester and test method thereof |
| CN113049399B (en) * | 2021-03-12 | 2023-11-21 | 广西科技大学 | Multifunctional creep deformation instrument for geosynthetic material and test method thereof |
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