CN115307948A - Indoor test device for BFRP anchor rod anchoring system performance research under power environment - Google Patents
Indoor test device for BFRP anchor rod anchoring system performance research under power environment Download PDFInfo
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- CN115307948A CN115307948A CN202210973307.4A CN202210973307A CN115307948A CN 115307948 A CN115307948 A CN 115307948A CN 202210973307 A CN202210973307 A CN 202210973307A CN 115307948 A CN115307948 A CN 115307948A
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Abstract
The invention discloses an indoor test device for researching the performance of a BFRP anchor rod anchoring system in a power environment, which comprises a horizontal lower bearing platform and an upper bearing platform, wherein the upper bearing platform is opposite to the lower bearing platform; a lower mold box is placed on the upper surface of the lower bearing platform, and an upper mold box is placed on the upper bearing platform; and a driving device is connected between the lower model box and the upper model box and is used for driving the lower model box and the upper model box to move simultaneously, the upper model box moves rightwards when the lower model box moves leftwards, and the upper model box moves leftwards when the lower model box moves rightwards. And pre-burying a BFRP anchor rod frame anchoring structure in the upper model box, pre-burying a steel anchor rod frame anchoring structure in the lower model box, starting a motor for testing, and collecting test data. Based on BFRP and analysis of dynamic strain response and acceleration response characteristics in the reinforced slope body of the steel anchor rod frame anchoring structure, the apparent deformation damage degree of the reinforced slope body of the two structures is combined, the reinforcing adaptability of the BFRP anchor rod frame anchoring structure is researched, and a dynamic slope fixing mechanism is disclosed.
Description
Technical Field
The invention belongs to the technical field of bridge damping design, and particularly relates to an indoor test device for BFRP anchor rod anchoring system performance research in a power environment.
Background
The anchor rod is the basic component of geotechnical engineering supporting structure. At present, the anchor rod is not only used in mines, but also in engineering technology for carrying out main body reinforcement on side slopes, tunnels, dams and the like.
The anchor rod is used as a tension member penetrating into the stratum, one end of the anchor rod is connected with an engineering structure, and the other end of the anchor rod penetrates into the stratum. The whole anchor rod is divided into a free section and an anchoring section. The free section is an area for transmitting the pulling force at the head of the anchor rod to the anchoring body, and has the function of applying prestress to the anchor rod; the anchoring section is an area where the prestressed tendons and the soil layer are bonded by cement paste, and has the functions of increasing the bonding friction effect of the anchoring body and the soil layer, increasing the bearing effect of the anchoring body and transmitting the tensile force of the free section to the deep part of the soil body.
With the continuous development and progress of the rock-soil anchoring technology, the BFRP reinforcement material has the excellent characteristics of light weight, high strength, corrosion resistance, fatigue resistance, environmental protection and the like, so that the BFRP reinforcement material can be exposed out of the head corner in the supporting engineering and can be widely applied to the field of rock-soil reinforcement as an anchor rod material. However, the research on the adaptability of the anchor rod under the power environment is still deficient, and the research on the comparison of the anchoring characteristics of the novel BFRP anchor rod and the traditional anchor rod under the power environment is of great significance in order to reveal the anchoring characteristics and differences of the novel BFRP anchor rod and the traditional anchor rod under the same power environment.
China patent CN201610951660.7 provides an anchor rod + hinge type building block ecological slope protection shaking table model test device. However, servo hydraulic is adopted in the current vibrating table for simulating indoor dynamic environment research, the cost is high, the energy loss is large, and the current vibrating table is only limited in research of the same material in one model box, so that the research efficiency is influenced.
Disclosure of Invention
The invention aims to solve the problem of adaptability research of a BFRP anchor rod in a power environment which is lacked at present, and provides an indoor test device for researching the performance of a BFRP anchor rod anchoring system in the power environment for revealing the anchoring characteristics and differences of a novel BFRP anchor rod and a traditional anchor rod in the same power environment.
Therefore, the invention adopts the following technical scheme:
an indoor test device for BFRP anchor rod anchoring system performance research under a power environment comprises a horizontal lower bearing platform and an upper bearing platform, wherein the upper bearing platform is opposite to the lower bearing platform;
a lower model box is placed on the upper surface of the lower bearing platform, the bottom of the lower model box is connected with a rigid roller, and the model box can move left and right along the lower bearing platform; the left end and the right end of the lower model box are respectively provided with a limiting baffle, two opposite surfaces of the two limiting baffles are respectively fixed with a spring group which protrudes forwards horizontally, the height of the spring group is lower than that of the lower model box, the elastic direction of the spring group is the horizontal direction, the lower model box impacts the spring group on the left side when moving leftwards to be close to the limiting baffles and impacts the spring group on the right side when moving rightwards to be close to the limiting baffles; the upper bearing platform is also provided with an upper mould box, a limit baffle and a spring group;
a driving device is connected between the lower model box and the upper model box and is used for driving the lower model box and the upper model box to move simultaneously, when the lower model box moves leftwards, the upper model box moves rightwards, when the lower model box moves rightwards, the upper model box moves leftwards, and the reciprocating movement strokes of the lower model box and the upper model box are equal; the moving stroke of the lower mold box and the upper mold box is smaller than the distance between the head ends of the two spring groups when the spring groups on the two sides are compressed to be shortest;
the test method of the test apparatus is as follows:
1) Respectively prefabricating a BFRP anchor rod frame anchoring structure and a steel anchor rod frame anchoring structure, and sticking a dynamic strain sensor on the same position of the two anchor rods;
2) Filling soil body model materials into an upper model box, filling and tamping layer by layer according to the thickness of each layer of 8-12cm, and pre-embedding an acceleration sensor and a BFRP anchor rod frame anchoring structure at a target position in the upper model box;
filling soil body model materials into a lower model box, filling and tamping layer by layer according to the thickness of each layer of 8-12cm, and pre-embedding an acceleration sensor and a steel anchor rod frame anchoring structure at a target position in the lower model box;
3) Connecting acceleration sensors and dynamic strain sensors of a BFRP anchor rod frame anchoring structure and a steel anchor rod frame anchoring structure to a data acquisition system, starting a motor to perform a test, and collecting test data;
4) Carrying out filtering and baseline correction preprocessing on acceleration and dynamic strain data collected in a test by using SPECTR calculation software;
and respectively drawing a dynamic strain time curve and an acceleration time curve in the reinforced slope body of the BFRP anchor rod frame anchoring structure and the steel anchor rod frame anchoring structure, and combining theoretical analysis and the apparent deformation and damage phenomenon of the test model slope body to further research the reinforcing adaptability of the BFRP anchor rod anchoring structure.
Furthermore, the driving device comprises a motor, a rocker, a first connecting rod and a second connecting rod, the motor is fixed on the outer side of the upper bearing platform, and the axis of the motor is perpendicular to the moving direction of the lower mould box; the head end of a rotating shaft of the motor is fixedly connected with the head end of a rocker, the tail end of the rocker is rotationally connected with the head end of a first connecting rod through a pin shaft, and the tail end of the first connecting rod is rotationally connected with the head end of a second connecting rod through a pin shaft; the rocker, the first connecting rod and the second connecting rod are respectively parallel to the front side surfaces of the lower mould box and the upper mould box;
a pin shaft protruding horizontally outwards is fixed in the middle of the front side surface of the lower mold box, and a pin shaft protruding horizontally outwards is also fixed in the middle of the front side surface of the upper mold box; the upper end and the lower end of the second connecting rod are respectively provided with a rectangular guide groove along the length direction, a pin shaft on the upper mould box is inserted in the rectangular guide groove at the upper end of the second connecting rod, and a pin shaft on the lower mould box is inserted in the rectangular guide groove at the lower end of the second connecting rod;
a fixing plate which vertically extends downwards is fixed in the middle of the front side surface of the upper bearing platform, a supporting shaft which protrudes outwards is fixed in the middle of the fixing plate, and the supporting shaft is positioned at the midpoint between the upper surface of the lower bearing platform and the upper surface of the upper bearing platform; the supporting shaft is rotatably connected with the central point of the second connecting rod.
Further, the motor is a double-output shaft motor; the back sides of the lower model box and the upper model box are also provided with a rocker, a first connecting rod and a second connecting rod.
Furthermore, two parallel guide grooves are formed in the upper surface of the lower bearing platform along the moving direction of the lower model box, and rigid rollers of the lower model box are clamped in the two guide grooves; the upper surface of the upper bearing platform is also provided with a corresponding guide groove.
The invention has the beneficial effects that: the device has simple structure, convenient processing and convenient and easy operation; the anchoring effect of the two types of anchor rods in rock and soil anchoring engineering can be simultaneously tested and researched under the same power environment, and the method is used for researching and comparing the anchoring performance difference of the novel BFRP anchor rod and the traditional anchor rod under the same power environment; the power drive adopts a double-output-shaft motor to drive a rocker structure to simultaneously drive two rigid model boxes to swing, and the rigid model boxes roll in the limiting grooves through rigid rollers, so that the energy cost consumption is greatly reduced.
Drawings
FIG. 1 is a schematic diagram of the construction of the test apparatus of the present invention;
FIG. 2 is a front view of FIG. 1;
FIG. 3 is a right side view of FIG. 1;
FIG. 4 is a rear view of FIG. 1;
in the figure: 1-lower bearing platform, 2-upper bearing platform, 3-guide groove, 4-lower mould box, 5-rigid roller, 6-spring group, 7-upper mould box, 8-motor, 9-rocker, 10-first connecting rod, 11-second connecting rod, 12-fixed plate and 13-rectangular guide groove.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
as shown in fig. 1 to 4, the indoor test device for researching the performance of the BFRP anchor rod anchoring system in the power environment comprises a horizontal lower bearing platform 1 and an upper bearing platform 2, wherein the upper bearing platform 2 is opposite to the lower bearing platform 1, the upper bearing platform 2 and the lower bearing platform 1 can be supported by using structures such as a bearing wall or a bearing frame, and the distance between the upper bearing platform 2 and the lower bearing platform 1 is 1-2m.
A lower model box 4 is placed on the upper surface of the lower bearing platform 1, the bottom of the lower model box 4 is connected with a rigid roller 5, and the lower model box 4 can move left and right along the lower bearing platform 1. In order to ensure that the model box always keeps linear motion, two parallel guide grooves 3 are arranged on the upper surface of the lower bearing platform 1 along the moving direction of the lower model box 4, and the rigid idler wheels 5 of the lower model box 4 are clamped in the two guide grooves 3.
The left end and the right end of the lower model box 4 are respectively provided with a limiting baffle, two opposite surfaces of the two limiting baffles are respectively fixed with a spring group 6 protruding forwards horizontally, the height of the spring group 6 is lower than that of the lower model box 4, the elastic direction of the spring group 6 is horizontal, and the lower model box 4 moves leftwards to be close to the limiting baffles and then impacts the spring group 6 on the left side and moves rightwards to be close to the limiting baffles and then impacts the spring group 6 on the right side. The upper bearing platform 2 is also provided with a corresponding upper mould box 7, a limit baffle and a spring group 6.
A driving device is connected between the lower model box 4 and the upper model box 7, the driving device is used for driving the lower model box 4 and the upper model box 7 to move simultaneously, when the lower model box 4 moves leftwards, the upper model box 7 moves rightwards, when the lower model box 4 moves rightwards, the upper model box 7 moves leftwards, and the reciprocating strokes of the lower model box 4 and the upper model box 7 are equal; the moving stroke of the lower mould box 4 and the upper mould box 7 is smaller than the distance between the head ends of the two spring groups 6 when the spring groups 6 on the two sides are compressed to the shortest.
The driving device comprises a motor 8, a rocker 9, a first connecting rod 10 and a second connecting rod 11, the motor 8 is fixed at the outer side of the upper bearing platform 2, and the axis of the motor 8 is vertical to the moving direction of the lower mould box 4; the head end of a rotating shaft of the motor 8 is fixedly connected with the head end of a rocker 9, the tail end of the rocker 9 is rotatably connected with the head end of a first connecting rod 10 through a pin shaft, and the tail end of the first connecting rod 10 is rotatably connected with the head end of a second connecting rod 11 through a pin shaft; the rocker 9, the first link 10 and the second link 11 are parallel to the front sides of the lower and upper mold boxes 4 and 7, respectively. A pin shaft protruding horizontally outwards is fixed in the middle of the front side surface of the lower model box 4, and a pin shaft protruding horizontally outwards is also fixed in the middle of the front side surface of the upper model box 7; rectangular guide grooves 13 are respectively formed in the upper end and the lower end of the second connecting rod 11 along the length direction, a pin shaft on the upper die box 7 is inserted into the rectangular guide groove 13 in the upper end of the second connecting rod 11, and a pin shaft on the lower die box 4 is inserted into the rectangular guide groove 13 in the lower end of the second connecting rod 11. A fixing plate 12 which extends vertically downwards is fixed in the middle of the front side surface of the upper bearing platform 2, a supporting shaft which protrudes outwards is fixed in the middle of the fixing plate 12, and the supporting shaft is positioned at the midpoint position between the upper surface of the lower bearing platform 1 and the upper surface of the upper bearing platform 2; the support shaft is rotatably connected to the center point of the second link 11.
In order to improve the motion stability of the lower mold box 4 and the upper mold box 7, the motor 8 is a double-output shaft motor, and the rocker 9, the first connecting rod 10 and the second connecting rod 11 are also arranged on the rear side surfaces of the lower mold box 4 and the upper mold box 7. The lower model box 4 and the upper model box 7 are driven to move by a double-shaft motor and a transmission device on two sides.
In order to be directed against the model box expansion test of equidimension not, spring assembly 6 includes the specification of multiple variation in size, and spring assembly 6 passes through the spring holder and keeps off fixed connection with spacing, and fixed connection can adopt the bolt fastening, dismantles removable spring assembly 6 of bolt. In addition, in order to improve the strength of the model box, the contact parts of the left end and the right end of the model box and the spring are increased in thickness, so that the model box is prevented from being deformed by collision.
The test method of the test apparatus is as follows:
1) Respectively prefabricating a BFRP anchor rod frame anchoring structure and a steel anchor rod frame anchoring structure, and sticking a dynamic strain sensor on the same position of the two anchor rods;
2) Filling soil body model materials into the upper model box 7, filling and tamping layer by layer according to the thickness of each layer of 8-12cm, and pre-embedding an acceleration sensor and a BFRP anchor rod frame anchoring structure at a target position in the upper model box 7;
filling soil body model materials into the lower model box 4, filling and tamping layer by layer according to the thickness of each layer of 8-12cm, and pre-embedding an acceleration sensor and a steel anchor rod frame anchoring structure at a target position in the lower model box 4;
3) Connecting an acceleration sensor and a dynamic strain sensor of a BFRP anchor rod frame anchoring structure and a steel anchor rod frame anchoring structure to a data acquisition system, starting a motor to perform a test, and collecting test data;
4) Carrying out filtering and baseline correction preprocessing on acceleration and dynamic strain data collected in a test by using SPECTR calculation software;
and respectively drawing a dynamic strain time curve and an acceleration time curve in the reinforced slope body of the BFRP anchor rod frame anchoring structure and the steel anchor rod frame anchoring structure, and combining theoretical analysis and the apparent deformation and damage phenomenon of the test model slope body to further research the reinforcing adaptability of the BFRP anchor rod anchoring structure.
After the time course curve and the acceleration time course response curve are obtained, the conventional research method can be adopted for research, and the method specifically comprises the following steps:
the research method comprises model tests and theoretical analysis, namely, a researched power testing device is adopted to develop a dynamic slope fixing model test of the anchoring structure, and based on data obtained by a sensor and deformation damage phenomenon analysis observed in the test process, the dynamic slope fixing adaptability and the dynamic slope fixing mechanism of the BFRP anchoring structure are disclosed) as follows: through pasting dynamic strain sensor at stock surface and burying acceleration sensor underground at the internal portion of slope, and then obtain stock dynamic strain response data and the internal acceleration dynamic response data of slope under the power effect, then draw BFRP stock frame anchor structure and steel stock frame anchor structure reinforced slope internal dynamic strain time curve and acceleration time curve respectively according to above data collection, based on this, BFRP stock frame anchor structure and steel stock frame anchor structure reinforced slope internal dynamic strain response characteristic and acceleration response characteristic respectively contrastively analyze, and combine BFRP stock frame anchor structure and the apparent deformation destruction degree of the slope body that steel stock frame anchor structure consolidated under the power effect, and then reveal BFRP stock frame anchor structure power solid slope adaptability and power solid slope mechanism.
Claims (4)
1. An indoor test device for BFRP anchor rod anchoring system performance research under a power environment is characterized by comprising a horizontal lower bearing platform (1) and an upper bearing platform (2), wherein the upper bearing platform (2) is opposite to the lower bearing platform (1);
a lower model box (4) is placed on the upper surface of the lower bearing platform (1), the bottom of the lower model box (4) is connected with a rigid roller (5), and the lower model box (4) can move left and right along the lower bearing platform (1); the left end and the right end of the lower model box (4) are respectively provided with a limiting baffle, two opposite surfaces of the two limiting baffles are respectively fixed with a spring group (6) which horizontally protrudes forwards, the height of the spring group (6) is lower than that of the lower model box (4), the elastic direction of the spring group (6) is horizontal, and the lower model box (4) impacts the spring group (6) on the left side when moving leftwards to be close to the limiting baffles and impacts the spring group (6) on the right side when moving rightwards to be close to the limiting baffles; an upper mould box (7), a limit baffle and a spring set (6) are also arranged on the upper bearing platform (2);
a driving device is connected between the lower model box (4) and the upper model box (7), the driving device is used for driving the lower model box (4) and the upper model box (7) to move simultaneously, the upper model box (7) moves rightwards when the lower model box (4) moves leftwards, the upper model box (7) moves leftwards when the lower model box (4) moves rightwards, and the reciprocating movement strokes of the lower model box (4) and the upper model box (7) are equal; the moving stroke of the lower mold box (4) and the upper mold box (7) is smaller than the distance between the head ends of the two spring groups (6) when the spring groups (6) on the two sides are compressed to be shortest;
the test method of the test apparatus is as follows:
1) Respectively prefabricating a BFRP anchor rod frame anchoring structure and a steel anchor rod frame anchoring structure, and sticking a dynamic strain sensor on the same position of the two anchor rods;
2) Filling soil model materials into an upper model box (7), filling and tamping layer by layer according to the thickness of each layer of 8-12cm, and pre-embedding an acceleration sensor and a BFRP anchor rod frame anchoring structure at a target position in the upper model box (7);
filling soil mass model materials into a lower model box (4), filling and tamping layer by layer according to the thickness of each layer of 8-12cm, and pre-burying an acceleration sensor and a steel anchor rod frame anchoring structure at a target position in the lower model box (4);
3) Connecting an acceleration sensor and a dynamic strain sensor of a BFRP anchor rod frame anchoring structure and a steel anchor rod frame anchoring structure to a data acquisition system, starting a motor to perform a test, and collecting test data;
4) Carrying out filtering and baseline correction pretreatment on the acceleration and dynamic strain data collected in the test by adopting SPECTR calculation software;
dynamic strain time curve and acceleration time curve in the BFRP anchor rod frame anchoring structure and the steel anchor rod frame anchoring structure reinforced slope are respectively drawn, theoretical analysis and test model slope apparent deformation damage phenomena are combined, and then the BFRP anchor rod anchoring structure reinforcing adaptability is researched.
2. The indoor test device for researching the performance of the BFRP anchor rod anchoring system in the dynamic environment as claimed in claim 1, wherein said driving device comprises a motor (8), a rocker (9), a first connecting rod (10) and a second connecting rod (11), said motor (8) is fixed on the outer side of the upper bearing platform (2), the axis of the motor (8) is perpendicular to the moving direction of the lower mould box (4); the head end of a rotating shaft of the motor (8) is fixedly connected with the head end of a rocker (9), the tail end of the rocker (9) is rotatably connected with the head end of a first connecting rod (10) through a pin shaft, and the tail end of the first connecting rod (10) is rotatably connected with the head end of a second connecting rod (11) through a pin shaft; the rocker (9), the first connecting rod (10) and the second connecting rod (11) are respectively parallel to the front side surfaces of the lower mould box (4) and the upper mould box (7);
a pin shaft protruding horizontally outwards is fixed in the middle of the front side surface of the lower model box (4), and a pin shaft protruding horizontally outwards is fixed in the middle of the front side surface of the upper model box (7); the upper end and the lower end of the second connecting rod (11) are respectively provided with a rectangular guide groove (13) along the length direction, a pin shaft on the upper model box (7) is inserted into the rectangular guide groove (13) at the upper end of the second connecting rod (11), and a pin shaft on the lower model box (4) is inserted into the rectangular guide groove (13) at the lower end of the second connecting rod (11);
a fixing plate (12) extending vertically downwards is fixed in the middle of the front side face of the upper bearing platform (2), a supporting shaft protruding outwards is fixed in the middle of the fixing plate (12), and the supporting shaft is located at the midpoint position between the upper surface of the lower bearing platform (1) and the upper surface of the upper bearing platform (2); the supporting shaft is rotatably connected with the central point of the second connecting rod (11).
3. The indoor test device for researching the performance of the BFRP anchor rod anchoring system in the dynamic environment according to claim 2, wherein the motor (8) is a double-output shaft motor; the rear side surfaces of the lower mould box (4) and the upper mould box (7) are also provided with a rocker (9), a first connecting rod (10) and a second connecting rod (11).
4. The indoor test device for the BFRP anchor rod anchoring system performance research under the power environment of claim 2 is characterized in that the upper surface of the lower bearing platform (1) is provided with two parallel guide grooves (3) along the moving direction of the lower model box (4), and the rigid roller (5) of the lower model box (4) is clamped in the two guide grooves (3); the upper surface of the upper bearing platform (2) is also provided with a corresponding guide groove (3).
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| CN202210973307.4A CN115307948B (en) | 2022-08-15 | 2022-08-15 | Indoor test device for BFRP anchor rod anchoring system performance research under power environment |
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| CN202210973307.4A CN115307948B (en) | 2022-08-15 | 2022-08-15 | Indoor test device for BFRP anchor rod anchoring system performance research under power environment |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1642033A1 (en) * | 1988-04-22 | 1991-04-15 | Североморское специализированное управление Всесоюзного производственного строительно-монтажного объединения "Союзгидроспецстрой" | Method and apparatus for bench testing of roof bolt locks |
| CN206189404U (en) * | 2016-11-23 | 2017-05-24 | 广东省路桥建设发展有限公司 | BFRP stock ground tackle |
| CN110749495A (en) * | 2019-11-28 | 2020-02-04 | 中国水利水电科学研究院 | Device and method for testing mechanical properties of anchor cable and inner anchor head |
-
2022
- 2022-08-15 CN CN202210973307.4A patent/CN115307948B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1642033A1 (en) * | 1988-04-22 | 1991-04-15 | Североморское специализированное управление Всесоюзного производственного строительно-монтажного объединения "Союзгидроспецстрой" | Method and apparatus for bench testing of roof bolt locks |
| CN206189404U (en) * | 2016-11-23 | 2017-05-24 | 广东省路桥建设发展有限公司 | BFRP stock ground tackle |
| CN110749495A (en) * | 2019-11-28 | 2020-02-04 | 中国水利水电科学研究院 | Device and method for testing mechanical properties of anchor cable and inner anchor head |
Non-Patent Citations (3)
| Title |
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| 吕敬富 等: "土层BFRP锚杆现场拉拔试验研究" * |
| 张黎明 等: "BFRP锚杆与钢筋锚杆现场拉拔试验对比分析" * |
| 王秋懿 等: "BFRP锚杆加固斜坡对地震动的响应特征――以功东高速响水河边坡为例" * |
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