CN111551356B - Enlarged head anchor rod group anchor test device and test method thereof - Google Patents
Enlarged head anchor rod group anchor test device and test method thereof Download PDFInfo
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- CN111551356B CN111551356B CN202010413501.8A CN202010413501A CN111551356B CN 111551356 B CN111551356 B CN 111551356B CN 202010413501 A CN202010413501 A CN 202010413501A CN 111551356 B CN111551356 B CN 111551356B
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- 238000012360 testing method Methods 0.000 title claims abstract description 42
- 238000010998 test method Methods 0.000 title claims abstract description 8
- 238000006073 displacement reaction Methods 0.000 claims abstract description 54
- 239000002689 soil Substances 0.000 claims abstract description 53
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 28
- 239000010959 steel Substances 0.000 claims abstract description 28
- 238000004873 anchoring Methods 0.000 claims abstract description 24
- 238000000034 method Methods 0.000 claims abstract description 13
- 239000002184 metal Substances 0.000 claims description 24
- 229910052751 metal Inorganic materials 0.000 claims description 24
- 239000005341 toughened glass Substances 0.000 claims description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 claims description 7
- 239000004568 cement Substances 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims description 4
- 238000011160 research Methods 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 3
- 239000011159 matrix material Substances 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 239000004576 sand Substances 0.000 claims description 3
- 239000003822 epoxy resin Substances 0.000 claims description 2
- 229920000647 polyepoxide Polymers 0.000 claims description 2
- 238000010276 construction Methods 0.000 abstract description 3
- 230000002093 peripheral effect Effects 0.000 abstract description 2
- 238000004088 simulation Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000013011 mating Effects 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The enlarged head anchor rod group anchor test device comprises a transparent test box, a plurality of enlarged head anchor rod models which are horizontally arranged in the test box, a second servo hydraulic loading device for drawing the enlarged head anchor rod models, and a first servo hydraulic loading device for vertically pressurizing soil; the box body is filled with soil, and the anchoring section model is buried in the middle of the soil and is clung to the front side wall of the test box; the free section model of the enlarged head anchor rod is connected with a first displacement meter, a tension pressure sensor and a second displacement meter; the right ends of the free section models of the plurality of enlarged head anchor rods are connected in parallel through steel plates, a digital camera is installed on the front side of the test box, and the digital camera is electrically connected with a computer. The invention also provides a test method of the enlarged head anchor rod group anchor test device. The invention can simulate the construction process of the extension head anchor rod pulling resistance in a laboratory so as to know the influence rule of single and multiple extension head anchor rods on the deformation of the peripheral soil body in the using stage.
Description
Technical Field
The invention relates to the field of geotechnical engineering, in particular to an enlarged head anchor rod group anchor test device and a test method thereof.
Background
In the soft soil area of southeast coast, the ultimate pulling resistance of the common anchor rod is smaller due to the low strength of the foundation soil, so that the application of the common anchor rod in the soft soil foundation is restricted. In order to improve the pulling resistance of the anchor rod in the soft soil foundation, engineering personnel research and develop the enlarged head anchor rod. The anchor rod adopts a high-pressure jet grouting process, and a cylindrical anchoring section with larger diameter is formed at the bottom of the anchor rod in a certain range, so that the pulling resistance of the anchor rod is remarkably improved.
The enlarged head anchor rod has the advantages of high construction speed, excellent quality, small influence on the surrounding environment, capability of effectively improving the pulling resistance of the anchor body, and the like. However, the action mechanism of the enlarged head anchor rod is not clear, so that the enlarged head anchor rod is still in an experience design stage. In addition, the anchor rods are generally in the form of a plurality of anchor rods in foundation pits and tunnel engineering. A plurality of anchor rods are arranged in a certain range, so that the anchor rods can be mutually influenced and restricted, the expected pulling resistance can not be achieved, and the engineering hidden trouble can be caused. The arrangement of the anchor rods at reasonable intervals has positive effects on engineering safety, stability, economy and rationality. The action mechanism of the anchor rod group is further researched through an indoor model test, and the method has very important significance for the safe application and popularization of the enlarged head anchor rod.
Disclosure of Invention
In order to overcome the problems, the invention provides the enlarged head anchor rod group anchor test device and the test method thereof, which have simple structures and are convenient to operate.
The first aspect of the invention provides an enlarged head anchor rod group anchor test device, which comprises a test box, a plurality of enlarged head anchor rod models which are horizontally arranged in the test box, a second servo hydraulic loading device which pulls the enlarged head anchor rod models, a first servo hydraulic loading device which vertically pressurizes soil, a first displacement meter, a second displacement meter, a tension pressure sensor, a digital camera and a computer, wherein the first servo hydraulic loading device is used for vertically pressurizing soil;
The expanding head anchor rod model is divided into a free section model and an anchor section model, the free section model is a threaded rod, a part of the threaded rod, which is positioned in the test box, is sleeved with a first sleeve used for separating the threaded rod from soil, the left end of the free section model is connected with the anchor section model, the anchor section model is of a semi-cylindrical structure, the semi-cylindrical structure is provided with a longitudinal section, and the longitudinal section is a rectangular surface; the enlarged head anchor rod models are horizontally arranged in the box body, and a plurality of enlarged head anchor rod models are stacked and distributed at intervals along the vertical direction;
The test box comprises a transparent box body, an opening for filling soil is formed in the top surface of the box body, and a cover plate is tightly matched at the opening; the top of the box body is provided with a reaction frame, the reaction frame is provided with a first servo hydraulic loading device which vertically extends downwards to load and apply pressure to the cover plate, and the bottom end of the first servo hydraulic loading device is in contact with the upper surface of the cover plate;
The box body is internally provided with a soil body and an enlarged head anchor rod model buried in the soil body, a plurality of pairs of through holes for the enlarged head anchor rod model to pass through are sequentially and symmetrically arranged on the left side wall and the right side wall of the box body along the vertical direction, and the right side of the box body is a drawing end; the through hole is arranged at a position close to the front side of the box body, so that when the enlarged head anchor rod model is arranged in the through hole in a penetrating way, the rectangular surface of the anchor section model is tightly attached to the front side wall of the box body; a plurality of marking points are uniformly arranged on the front side wall of the box body;
The enlarged head anchor rod model horizontally penetrates into the box body from a through hole positioned on the right side of the box body along the central axis direction of the through hole, and the anchoring section model is buried in the middle of the soil body; the right parts of the free section models are exposed out of the box body, and the right ends of the free section models of the plurality of enlarged head anchor rod models are connected together through steel plates; the plane of the steel plate is vertical to the axial direction of the enlarged footing anchor rod model, a plurality of connecting holes are formed in the steel plate at positions corresponding to the enlarged footing anchor rod models, and the enlarged footing anchor rod models penetrate through the connecting holes and are fixedly connected with the steel plate; the right side of the steel plate is connected with a second servo hydraulic loading device for horizontally drawing the enlarged head anchor rod model; the part of the free section model, which is positioned outside the box body, is provided with a first displacement meter for measuring the elastic displacement information of the free section model and a tension pressure sensor for measuring the horizontal tension of the enlarged head anchor rod model, and the first displacement meter is connected with a threaded rod of the free section model through a small iron sheet;
The left end of the anchoring section model is connected with one end of a metal wire, the other end of the metal wire penetrates through a through hole in the left side of the box body and is connected with a second displacement meter for measuring horizontal displacement information of the enlarged head anchor rod model, and a second sleeve for isolating the metal wire from soil is sleeved on the part of the metal wire in the box body;
The front side of the test box is provided with a digital camera for shooting soil body displacement pictures, and the digital camera is electrically connected with a computer so as to transmit the shot displacement pictures to the computer;
The first displacement meter, the second displacement meter and the tension pressure sensor are respectively and electrically connected with the computer so as to transmit the detected elastic displacement information, the detected horizontal displacement information and the detected horizontal tension to the computer;
The first servo hydraulic loading device and the second servo hydraulic loading device are respectively and electrically connected with a computer, and the computer controls the first servo hydraulic loading device and the second servo hydraulic loading device.
Further, the plurality of marking points are arranged in a matrix, and the distance between the adjacent marking points is 10cm.
Further, the box body is made of toughened glass.
Further, the outer surface of the anchor segment mold is coated with an epoxy layer.
Further, the cover plate is a steel plate.
Further, the anchoring section model is made of cement or rubber materials.
The second aspect of the invention provides a test method of an enlarged head anchor rod group anchor test device, which comprises the following steps:
Step 1, connecting a free section threaded rod and an anchoring section to form an enlarged head anchor rod model;
step 2, filling soil into the box in a layering manner by using a sand rain method, and compacting after filling a certain thickness to ensure uniform filling; flattening the soil surface when the filling height is close to the small hole of the box body;
Step 3, embedding a pre-prepared enlarged head anchor rod model to ensure the anchor rod level; a single enlarged head anchor rod model is put into the box body along the axial direction of the through hole from the through hole on the right side of the box body, so that a threaded rod of the free section model horizontally penetrates through the through hole, and a first sleeve is sleeved on the part of the threaded rod of the free section model, which is positioned on the box body; the surface of the anchoring section model of the semi-cylindrical structure is required to be clung to the toughened glass of the front side wall of the box body; placing a plurality of enlarged head anchor rod models, and ensuring that the distance between each enlarged head anchor rod model meets the test requirement; the right end of each expansion head anchor rod model is connected by a steel sheet, and the steel sheet is required to be perpendicular to the second servo hydraulic loading device, so that the stress of each expansion head anchor rod model is ensured to be uniform;
Step 4, the left end of the anchoring section model is connected with the metal wire, the metal wire horizontally passes through the through hole on the left side of the box body, and a second sleeve is sleeved outside the metal wire;
step 5, continuously filling a preset amount of soil into the box body, compacting, and covering the cover plate;
step 6, connecting a plurality of first displacement meters on the enlarged head anchor rod model in parallel, and connecting a metal wire with a second displacement meter;
step 7, connecting the threaded rod with a tension pressure sensor, connecting the right end of the steel plate with a second servo hydraulic loading device, and connecting the first servo hydraulic loading device with a cover plate;
step 8, the first servo hydraulic loading device controls the upper load to be loaded to a set value;
and 9, ensuring that the enlarged head anchor rod model is kept close to toughened glass in the loading process, adopting an oil pump to carry out pressurization loading by a second servo hydraulic loading device, automatically loading by a computer control, recording the actual loading quantity by a tension pressure sensor, recording readings of displacement meters on two sides, taking a picture after each stage of loading by a digital camera, and recording soil deformation to simulate the process of an extension head anchor rod pulling-out test.
And 10, analyzing related data, processing soil deformation images by using software, observing soil changes before and after loading of each stage, and preparing for subsequent research.
The beneficial effects of the invention are as follows: the structure is simple, the operation is convenient, the fitting is practical, and the simulation of various working conditions can be realized. The construction process of the extension head anchor rod anti-pulling can be simulated in a laboratory, so that the influence rule of the single extension head anchor rod and the plurality of extension head anchor rods on the deformation of the peripheral soil body in the using stage can be known. The expansion head anchor rod model is formed by the threaded rod and the cement block, so that the simulation effect is more accurate and the simulation effect is more practical.
Drawings
Fig. 1 is a schematic structural view of an enlarged head anchor group anchor test device.
Fig. 2 is a schematic view of the structure of the enlarged head anchor.
FIG. 3 is a schematic diagram of the mating structure of the second displacement meter and the wire.
FIG. 4 is a schematic diagram of the mating structure of the first displacement meter and the free section model.
Reference numerals illustrate: 1. a case; 2. the front side wall of the box body; 3. a cover plate; 4. a reaction frame; 5. a first servo hydraulic loading device; 6. marking points; 7. anchoring the segment model; 8. a first sleeve; 9. a free segment model; 10. a vertical rod; 11. small iron pieces; 12. a first displacement meter; 13. a wire; 14. a second displacement meter; 15. a second sleeve; 16. a second servo hydraulic loading device; 17. a pull pressure sensor; 18. a tripod; 19. a digital camera; 20. and a computer.
Detailed Description
The following description of the embodiments of the present invention will be made more apparent and fully hereinafter with reference to the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that, as the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," and the like are used for convenience in describing the present invention and simplifying the description based on the azimuth or positional relationship shown in the drawings, it should not be construed as limiting the present invention, but rather should indicate or imply that the devices or elements referred to must have a specific azimuth, be constructed and operated in a specific azimuth. Furthermore, the terms "first," "second," "third," and the like, as used herein, are used for descriptive purposes only and are not to be construed as indicating or implying any relative importance.
In the description of the present invention, it should be noted that unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "connected" should be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Referring to the drawings, an enlarged head anchor rod group anchor test device comprises a test box, a plurality of enlarged head anchor rod models which are horizontally arranged in the test box, a second servo hydraulic loading device 16 for drawing the enlarged head anchor rod models, a first servo hydraulic loading device 5 for vertically pressurizing soil body, a first displacement meter 12, a second displacement meter 14, a drawing pressure sensor 17, a digital camera 19 and a computer 20;
The expanding head anchor rod model is divided into a free section model 9 and an anchor section model 7, the free section model 9 is a threaded rod, a first sleeve 8 for separating the threaded rod from soil is sleeved on the part of the threaded rod, which is positioned in the test box, the left end of the free section model 9 is connected with the anchor section model, the anchor section model 7 is of a semi-cylindrical structure, the semi-cylindrical structure is provided with a longitudinal section, and the longitudinal section is a rectangular surface; the anchoring section model 7 is made of cement or rubber materials, an epoxy resin layer is coated on the outer surface of the anchoring section model 7, and soil particles are adhered to the outer surface of the anchoring section model 7. The enlarged head anchor rod models are horizontally arranged in the box body, and a plurality of enlarged head anchor rod models are stacked and distributed at intervals along the vertical direction;
the test box comprises a transparent box body 1, wherein the box body 1 is made of toughened glass. The top surface of the box body 1 is provided with an opening for filling soil, the opening is tightly matched with a cover plate 3, and the cover plate 3 is a steel plate; the top of the box body 1 is provided with a reaction frame 4, the reaction frame 4 is provided with a first servo hydraulic loading device 5 which extends vertically downwards to load and apply pressure to the cover plate, and the bottom end of the first servo hydraulic loading device 5 is in contact with the upper surface of the cover plate 3;
Soil body and an enlarged head anchor rod model buried in the soil body are arranged in the box body 1, a plurality of pairs of through holes for the enlarged head anchor rod model to pass through are sequentially and symmetrically arranged on the left side wall and the right side wall of the box body 1 along the vertical direction, and the right side of the box body 1 is a drawing end; the through hole is arranged at a position close to the front side of the box body 1, so that when the enlarged head anchor rod model is arranged in the through hole in a penetrating way, the rectangular surface of the anchor section model 7 is tightly attached to the front side wall 2 of the box body; a plurality of marking points 6 are uniformly arranged on the front side wall 2 of the box body, the marking points 6 are arranged in a matrix, and the distance between the adjacent marking points 6 is 10cm.
The enlarged head anchor rod model horizontally penetrates into the box body 1 from a through hole positioned on the right side of the box body along the central axis direction of the through hole, and the anchoring section model 7 is buried in the middle of the soil body; the right parts of the free section models 9 are exposed out of the box body, and the right ends of the free section models 9 of the plurality of enlarged head anchor rod models are connected together through steel plates; the plane of the steel plate is vertical to the axial direction of the enlarged footing anchor rod model, a plurality of connecting holes are formed in the steel plate at positions corresponding to the enlarged footing anchor rod models, and the enlarged footing anchor rod models penetrate through the connecting holes and are fixedly connected with the steel plate; the right side of the steel plate is connected with a second servo hydraulic loading device 16 for horizontally drawing the enlarged head anchor rod model, and the second servo hydraulic loading device 16 is supported by the upright rod 10; the part of the free section model 9 positioned outside the box body is provided with a first displacement meter 12 for measuring the elastic displacement information of the free section model 9 and a tension pressure sensor for measuring the horizontal tension of the enlarged head anchor rod model, and the first displacement meter 12 is connected with a threaded rod of the free section model 9 through a small iron sheet 11;
The left end of the anchoring section model 7 is connected with one end of a metal wire 13, the other end of the metal wire 13 passes through a through hole positioned at the left side of the box body 1 and is connected with a second displacement meter 14 for measuring the horizontal displacement information of the enlarged head anchor rod model, and a second sleeve 15 for isolating the metal wire from soil is sleeved on the part of the metal wire positioned in the box body;
The front side of the test box is provided with a digital camera 19 for shooting soil body displacement pictures, the digital camera 19 is supported by a tripod 18, and the digital camera 19 is electrically connected with a computer 20 so as to transmit the shot displacement pictures to the computer 20;
the first displacement meter 12, the second displacement meter 14 and the tension pressure sensor 17 are respectively and electrically connected with the computer 20 so as to transmit the detected elastic displacement information, horizontal displacement information and horizontal tension to the computer 20;
the first servo hydraulic loading device 5 and the second servo hydraulic loading device 16 are respectively and electrically connected with a computer 20, and the computer 20 controls the first servo hydraulic loading device 5 and the second servo hydraulic loading device 16.
A test method of an enlarged head anchor rod group anchor test device comprises the following steps:
Step 1, connecting a free section threaded rod and an anchoring section to form an enlarged head anchor rod model;
step 2, filling soil into the box in a layering manner by using a sand rain method, and compacting after filling a certain thickness to ensure uniform filling; flattening the soil surface when the filling height is close to the small hole of the box body;
Step 3, embedding a pre-prepared enlarged head anchor rod model to ensure the anchor rod level; a single enlarged head anchor rod model is put into the box body along the axial direction of the through hole from the through hole on the right side of the box body, so that a threaded rod of the free section model horizontally penetrates through the through hole, and a first sleeve is sleeved on the part of the threaded rod of the free section model, which is positioned on the box body; the surface of the anchoring section model of the semi-cylindrical structure is required to be clung to the toughened glass of the front side wall of the box body; placing a plurality of enlarged head anchor rod models, and ensuring that the distance between each enlarged head anchor rod model meets the test requirement; the right end of each expansion head anchor rod model is connected by a steel sheet, and the steel sheet is required to be perpendicular to the second servo hydraulic loading device, so that the stress of each expansion head anchor rod model is ensured to be uniform;
Step 4, the left end of the anchoring section model is connected with the metal wire, the metal wire horizontally passes through the through hole on the left side of the box body, and a second sleeve is sleeved outside the metal wire;
step 5, continuously filling a preset amount of soil into the box body, compacting, and covering the cover plate;
step 6, connecting a plurality of first displacement meters on the enlarged head anchor rod model in parallel, and connecting a metal wire with a second displacement meter;
step 7, connecting the threaded rod with a tension pressure sensor, connecting the right end of the steel plate with a second servo hydraulic loading device, and connecting the first servo hydraulic loading device with a cover plate;
step 8, the first servo hydraulic loading device controls the upper load to be loaded to a set value;
and 9, ensuring that the enlarged head anchor rod model is kept close to toughened glass in the loading process, adopting an oil pump to carry out pressurization loading by a second servo hydraulic loading device, automatically loading by a computer control, recording the actual loading quantity by a tension pressure sensor, recording readings of displacement meters on two sides, taking a picture after each stage of loading by a digital camera, and recording soil deformation to simulate the process of an extension head anchor rod pulling-out test.
And 10, analyzing related data, processing soil deformation images by using software, observing soil changes before and after loading of each stage, and preparing for subsequent research.
The embodiments described in the present specification are merely examples of implementation forms of the inventive concept, and the scope of protection of the present invention should not be construed as being limited to the specific forms set forth in the embodiments, and the scope of protection of the present invention and equivalent technical means that can be conceived by those skilled in the art based on the inventive concept.
Claims (5)
1. An enlarged footing stock crowd anchor test device, its characterized in that: the device comprises a test box, a plurality of enlarged head anchor rod models which are horizontally arranged in the test box, a second servo hydraulic loading device which is used for drawing the enlarged head anchor rod models, a first servo hydraulic loading device which is used for vertically pressurizing soil body, a first displacement meter, a second displacement meter, a tension pressure sensor, a digital camera and a computer;
The expanding head anchor rod model is divided into a free section model and an anchor section model, the free section model is a threaded rod, a part of the threaded rod, which is positioned in the test box, is sleeved with a first sleeve used for separating the threaded rod from soil, the left end of the free section model is connected with the anchor section model, the anchor section model is of a semi-cylindrical structure, the semi-cylindrical structure is provided with a longitudinal section, and the longitudinal section is a rectangular surface; the enlarged head anchor rod models are horizontally arranged in the box body, and a plurality of enlarged head anchor rod models are stacked and distributed at intervals along the vertical direction;
The test box comprises a transparent box body, an opening for filling soil is formed in the top surface of the box body, and a cover plate is tightly matched at the opening; the top of the box body is provided with a reaction frame, the reaction frame is provided with a first servo hydraulic loading device which vertically extends downwards to load and apply pressure to the cover plate, and the bottom end of the first servo hydraulic loading device is in contact with the upper surface of the cover plate;
The box body is internally provided with a soil body and an enlarged head anchor rod model buried in the soil body, a plurality of pairs of through holes for the enlarged head anchor rod model to pass through are sequentially and symmetrically arranged on the left side wall and the right side wall of the box body along the vertical direction, and the right side of the box body is a drawing end; the through hole is arranged at a position close to the front side of the box body, so that when the enlarged head anchor rod model is arranged in the through hole in a penetrating way, the rectangular surface of the anchor section model is tightly attached to the front side wall of the box body; a plurality of marking points are uniformly arranged on the front side wall of the box body;
The enlarged head anchor rod model horizontally penetrates into the box body from a through hole positioned on the right side of the box body along the central axis direction of the through hole, and the anchoring section model is buried in the middle of the soil body; the right parts of the free section models are exposed out of the box body, and the right ends of the free section models of the plurality of enlarged head anchor rod models are connected together through steel plates; the plane of the steel plate is vertical to the axial direction of the enlarged footing anchor rod model, a plurality of connecting holes are formed in the steel plate at positions corresponding to the enlarged footing anchor rod models, and the enlarged footing anchor rod models penetrate through the connecting holes and are fixedly connected with the steel plate; the right side of the steel plate is connected with a second servo hydraulic loading device for horizontally drawing the enlarged head anchor rod model; the part of the free section model, which is positioned outside the box body, is provided with a first displacement meter for measuring the elastic displacement information of the free section model and a tension pressure sensor for measuring the horizontal tension of the enlarged head anchor rod model, and the first displacement meter is connected with a threaded rod of the free section model through a small iron sheet;
The left end of the anchoring section model is connected with one end of a metal wire, the other end of the metal wire penetrates through a through hole in the left side of the box body and is connected with a second displacement meter for measuring horizontal displacement information of the enlarged head anchor rod model, and a second sleeve for isolating the metal wire from soil is sleeved on the part of the metal wire in the box body;
The front side of the test box is provided with a digital camera for shooting soil body displacement pictures, and the digital camera is electrically connected with a computer so as to transmit the shot displacement pictures to the computer;
The first displacement meter, the second displacement meter and the tension pressure sensor are respectively and electrically connected with the computer so as to transmit the detected elastic displacement information, the detected horizontal displacement information and the detected horizontal tension to the computer;
the first servo hydraulic loading device and the second servo hydraulic loading device are respectively and electrically connected with a computer, and the computer controls the first servo hydraulic loading device and the second servo hydraulic loading device;
The marking points are arranged in a matrix, and the distance between adjacent marking points is 10cm;
the box body is made of toughened glass.
2. The enlarged head anchor group anchor test device of claim 1, wherein: the outer surface of the anchoring section model is coated with an epoxy resin layer.
3. The enlarged head anchor group anchor test device of claim 1, wherein: the cover plate is a steel plate.
4. The enlarged head anchor group anchor test device of claim 1, wherein: the anchoring section model is made of cement or rubber materials.
5. A method of testing an enlarged head anchor cluster testing device according to any one of claims 1 to 4, comprising the steps of:
Step 1, connecting a free section threaded rod and an anchoring section to form an enlarged head anchor rod model;
step 2, filling soil into the box in a layering manner by using a sand rain method, and compacting after filling a certain thickness to ensure uniform filling; flattening the soil surface when the filling height is close to the small hole of the box body;
Step 3, embedding a pre-prepared enlarged head anchor rod model to ensure the anchor rod level; a single enlarged head anchor rod model is put into the box body along the axial direction of the through hole from the through hole on the right side of the box body, so that a threaded rod of the free section model horizontally penetrates through the through hole, and a first sleeve is sleeved on the part of the threaded rod of the free section model, which is positioned on the box body; the rectangular surface of the anchoring section model of the semi-cylindrical structure is required to be clung to the toughened glass of the front side wall of the box body; placing a plurality of enlarged head anchor rod models, and ensuring that the distance between each enlarged head anchor rod model meets the test requirement; the right end of each expansion head anchor rod model is connected by a steel sheet, and the steel sheet is required to be perpendicular to the second servo hydraulic loading device, so that the stress of each expansion head anchor rod model is ensured to be uniform;
Step 4, the left end of the anchoring section model is connected with the metal wire, the metal wire horizontally passes through the through hole on the left side of the box body, and a second sleeve is sleeved outside the metal wire;
step 5, continuously filling a preset amount of soil into the box body, compacting, and covering the cover plate;
step 6, connecting a plurality of first displacement meters on the enlarged head anchor rod model in parallel, and connecting a metal wire with a second displacement meter;
step 7, connecting the threaded rod with a tension pressure sensor, connecting the right end of the steel plate with a second servo hydraulic loading device, and connecting the first servo hydraulic loading device with a cover plate;
step 8, the first servo hydraulic loading device controls the upper load to be loaded to a set value;
Step 9, ensuring that the enlarged head anchor rod model is kept close to toughened glass in the loading process, adopting an oil pump to carry out pressurized loading by a second servo hydraulic loading device, automatically loading by a computer control, recording the actual loading quantity by a tension pressure sensor, recording readings of displacement meters at two sides, taking a picture after each stage of loading by a digital camera, and recording soil deformation to simulate the process of an extension head anchor rod pulling-out test;
and 10, analyzing related data, processing soil deformation images by using software, observing soil changes before and after loading of each stage, and preparing for subsequent research.
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| CN113172104A (en) * | 2021-05-07 | 2021-07-27 | 江苏艾可森钢绳有限公司 | Steel wire drawing experimental equipment with recording function |
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