CN110749495A - Device and method for testing mechanical properties of anchor cable and inner anchor head - Google Patents

Device and method for testing mechanical properties of anchor cable and inner anchor head Download PDF

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Publication number
CN110749495A
CN110749495A CN201911189603.XA CN201911189603A CN110749495A CN 110749495 A CN110749495 A CN 110749495A CN 201911189603 A CN201911189603 A CN 201911189603A CN 110749495 A CN110749495 A CN 110749495A
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China
Prior art keywords
anchor
simulation
simulated
surrounding rock
mortar
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CN201911189603.XA
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Chinese (zh)
Inventor
林兴超
汪小刚
孙彦鹏
王玉杰
赵宇飞
孙兴松
皮进
聂勇
尹涛
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China Institute of Water Resources and Hydropower Research
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China Institute of Water Resources and Hydropower Research
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Priority to CN201911189603.XA priority Critical patent/CN110749495A/en
Publication of CN110749495A publication Critical patent/CN110749495A/en
Priority to AU2020103241A priority patent/AU2020103241A4/en
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/02Details
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/08Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
    • G01N3/10Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure

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  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Piles And Underground Anchors (AREA)
  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)

Abstract

The invention discloses a device and a method for testing mechanical properties of an anchor cable and an inner anchor head, wherein the device comprises an environment simulation assembly, wherein the environment simulation assembly is internally provided with an anchor cable and anchor head simulation assembly and a stress deformation monitoring assembly, the environment simulation assembly comprises a box body, simulation mortar and simulation surrounding rock are filled in the box body, and the simulation surrounding rock is internally provided with an anchor cable and anchor head simulation assembly; the test method comprises the following steps: s1, manufacturing simulated surrounding rocks with different strengths, and arranging a surrounding rock mortar internal stress monitoring pressure box; s2, arranging anchor cable axial force monitoring sensors at two ends of the simulated anchor cable, and respectively connecting two ends of the simulated inner anchor head with the simulated anchor cable and the jack; s3, grouting operation is carried out in the box body, and a surrounding rock mortar internal stress monitoring pressure box is arranged; s4, depicting a surrounding rock mortar deformation monitoring auxiliary line, and installing a video monitor; and S5, controlling the jack to simulate, and recording the data change of each instrument in the tensioning process in real time.

Description

Device and method for testing mechanical properties of anchor cable and inner anchor head
Technical Field
The invention relates to the field of geotechnical engineering, in particular to a device and a method for testing mechanical properties of an anchor cable and an inner anchor head.
Background
The anchor cable is one of the most common and effective reinforcement measures in slope reinforcement, the inner anchor head is used as a core component of an inner anchoring section of the anchor cable, and the maximum uplift resistance provided by the anchor cable is determined by mechanical characteristics of the inner anchor head. At present, the mechanical property test of the anchor cable and the inner anchor head lacks of effective indoor test equipment and method, and certain obstruction is caused to the development of the geotechnical engineering field.
Disclosure of Invention
The invention aims to solve the problems and provides a device and a method for testing the mechanical properties of an anchor cable and an inner anchor head, which have simple structures and are convenient to operate.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a mechanical property testing device for an anchor cable and an inner anchor head comprises an environment simulation assembly, wherein the environment simulation assembly is internally provided with an anchor cable and anchor head simulation assembly and a stress deformation monitoring assembly, the environment simulation assembly comprises a box body, a cover plate, simulation mortar and simulation surrounding rock, the top end of the box body is provided with an opening, the top end of the box body is connected with the cover plate, the cover plate is made of transparent materials, the simulation mortar and the simulation surrounding rock are filled in the box body, the simulation surrounding rock is positioned in the middle of the simulation mortar, and the anchor cable and anchor head simulation assembly is arranged in the simulation; the simulation assembly of the anchor head of the anchor cable comprises a simulation anchor cable, a simulation inner anchor head and a jack, wherein the volume of the simulation inner anchor head is half of the actual volume of the anchor head divided along the axis, the simulation inner anchor head is placed in the simulation surrounding rock, one end of the simulation inner anchor head is connected with one end of the simulation anchor cable, and the other end of the simulation anchor cable sequentially penetrates through the simulation surrounding rock and the side wall of the box body and then is connected with the jack; the stress deformation monitoring assembly comprises an anchor cable axial force monitoring sensor, a surrounding rock mortar deformation monitoring auxiliary line, a surrounding rock mortar internal stress monitoring pressure box, a video monitoring frame and a video monitor; anchor rope axial force monitoring sensor sets up the both ends at the simulation anchor rope, and surrounding rock mortar warp monitoring auxiliary line sets up the apron up end in the anchor head outside in the simulation, and the inside stress monitoring pressure cell of surrounding rock mortar has a plurality of and equidistant setting at the simulation mortar, in the simulation surrounding rock, video monitoring frame bottom and box or ground fixed connection, video monitoring frame top fixed connection video monitor, and the camera of video monitor is towards surrounding rock mortar warp monitoring auxiliary line.
Furthermore, the box body comprises a bottom plate, a front side plate, a rear side plate, a left side plate and a right side plate, and the bottom plate, the front side plate, the rear side plate, the left side plate and the right side plate are welded into a rectangular box body in a sealed state.
Furthermore, one end of the jack is in contact with the left side plate, and the other end of the jack is connected with one end of the simulation anchor cable.
Furthermore, the cross section of the simulated surrounding rock is semicircular, and an anchor hole for the simulated anchor cable to penetrate through is formed in the simulated surrounding rock.
Furthermore, one end of the anchor cable is connected with one end of the anchor head close to the right side plate, and the other end of the anchor cable sequentially penetrates through the anchor head, the simulated surrounding rock and the side wall of the box body and then is connected with the jack.
Furthermore, the surrounding rock mortar deformation monitoring auxiliary lines are two groups of scale marks which are carved on the upper end surface of the cover plate and are perpendicular to each other, and each group of scale marks are two and are parallel to each other.
Further, the surrounding rock mortar internal stress monitoring pressure boxes are arranged on the front side and the rear side below the anchor cable side by side.
Furthermore, the simulation anchor cable is a steel strand.
A test method of a mechanical property test device of an anchor cable and an inner anchor head is characterized in that: the method comprises the following steps:
s1, manufacturing simulated surrounding rocks with different strengths by adjusting the concrete proportion, and arranging anchor holes with different diameters and surrounding rock mortar internal stress monitoring pressure boxes in the simulated surrounding rocks;
s2, manufacturing different types of simulated inner anchor heads and simulated anchor cables through 3D printing or steel casting, placing the simulated inner anchor heads in simulated surrounding rock, arranging anchor cable axial force monitoring sensors at two ends of the simulated anchor cables, connecting the simulated inner anchor heads with one ends of the simulated anchor cables, and installing a jack after the other ends of the simulated anchor cables penetrate through an anchor hole and a left side plate;
s3, adjusting the proportion of cement mortar, manufacturing simulated mortar with different strengths, performing grouting operation in a box body, and arranging a surrounding rock mortar internal stress monitoring pressure box in the simulated mortar;
s4, depicting a surrounding rock mortar deformation monitoring auxiliary line on the upper end face of the cover plate, and installing a full-video monitoring frame and a video monitor;
and S5, performing anchor cable tensioning process simulation under different conditions by controlling the jack, and recording data changes of the anchor cable axial force monitoring sensor and the anchor cable axial force monitoring sensor in the tensioning process and deformation data of simulated mortar and simulated surrounding rock in real time, so as to obtain mechanical property results of the simulated anchor cable and the simulated inner anchor head.
Compared with the prior art, the invention has the advantages and positive effects that:
according to the invention, simulation of occurrence environments such as different surrounding rocks, mortar and anchor holes can be realized through the environment simulation assembly, and basic conditions are provided for testing mechanical properties of the anchor cable and the inner anchor head; the simulation of the tensioning process of different inner anchor heads and anchor cables can be realized through the anchor head simulation assembly of the anchor cable; the stress deformation monitoring assembly can realize the whole process of deformation and damage of mortar and surrounding rocks and stress deformation data information in the anchor cable tensioning process, and through the cooperation of the three assemblies, the simulation of the anchor cable tensioning process under different conditions can be realized, accurate stress deformation test data can be obtained, a research foundation is provided for the mechanical property test of the anchor cable and the inner anchor head, and convenience is brought to the research work in the field of rock and soil.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a cross-sectional view A-A of FIG. 1;
fig. 3 is a sectional view B-B of fig. 1.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived from the embodiments of the present invention by a person skilled in the art without any creative effort, should be included in the protection scope of the present invention.
As shown in fig. 1, fig. 2 and fig. 3, a test apparatus suitable for testing mechanical properties of an anchor cable and an inner anchor head includes an environment simulation assembly 1, an anchor cable and anchor head simulation assembly 2, and a stress deformation monitoring assembly 3.
The environment simulation assembly 1 comprises a rectangular parallelepiped frame composed of a bottom plate 101, a left side plate 105, a right side plate 104, a rear side plate 102, a front side plate 103, and a transparent observation cover plate 106, and the size of the frame can be determined by itself according to a simulation environment. The left side plate 105 plays a role in loading reaction and has higher requirement on rigidity, and the left side plate 105 is designed to be a thick steel plate with the thickness of 30 mm; in order to facilitate observation of the deformation characteristics of the surrounding rock and mortar materials in the test process, the top plate adopts a transparent observation cover plate 106. The simulated mortar 107 and the simulated surrounding rock 108 are both realized by cast-in-place, and in the casting process, according to the characteristics of the axisymmetric model, half of the actual situation is taken as a research object, and the simulation of the actual conditions through half of the rock mass and the mortar is feasible according to the characteristics of the axisymmetric object.
The cable line head simulation assembly 2 comprises a simulated inner head 201, a simulated cable line 202 and a loading jack 203. For slope observation, the simulated inner anchor head 201 is half of an actual model, is feasible through half of the actual conditions of the anchor head according to the characteristics of axisymmetric objects, and can be manufactured by 3D printing or steel pouring and other methods according to a design drawing; the simulated anchor cable 202 is a steel strand used by an actual anchor cable, so that the actual simulation is the anchor cable tension working condition of two axisymmetric steel strands; the loading jack 203 is a hydraulic servo control jack, which is convenient for tension load control in the test process.
The stress deformation monitoring system 3 comprises an anchor cable axial force monitoring sensor 301, a surrounding rock mortar deformation monitoring auxiliary line 302, a surrounding rock mortar internal stress monitoring pressure box 303, a video monitoring frame 304 and a video monitoring device 305. The surrounding rock mortar deformation monitoring auxiliary line 302 is formed by manually depicting two groups of mutually perpendicular auxiliary lines with scales at positions near the simulated inner anchor head 201, and the whole process of surrounding rock and mortar deformation in the tensioning process of the anchor cable can be obtained through video monitoring.
The testing device comprises the following testing steps:
s1, manufacturing simulated surrounding rocks 108 representing different strengths through adjusting the concrete proportion, and simulating anchor holes 109 with different diameters through prefabricated round through holes in the manufacturing process;
s2, manufacturing different types of simulated inner anchor heads 201 through 3D printing or steel casting technology, connecting the simulated inner anchor heads 201 with steel strands through conventional anchor cable fixing equipment, and installing a hydraulic servo jack 203 to realize servo control of anchor cable tensioning and realize different loading modes;
s3, preparing simulated mortar 107 with different strengths by adjusting the proportion of the cement mortar, and truly simulating the grouting process in the engineering by adopting the simulated mortar 107;
s4, in the process of S1-S3, installing an anchor cable axial force sensor 301, a pressure box 303 for testing the stress of the embedded surrounding rock mortar, a depicting surrounding rock mortar deformation monitoring auxiliary line 302, a video monitoring frame 304 and video monitoring equipment 305 at corresponding positions;
s5, simulating the anchor cable tensioning process under different conditions by controlling the servo jack, recording the stress deformation characteristics of the anchor cable, surrounding rocks and mortar in real time in the tensioning process, and providing basic conditions for testing the mechanical characteristics of the anchor head in the anchor cable.

Claims (9)

1. The utility model provides an anchor rope and interior anchor head's mechanical properties testing arrangement, includes the environmental simulation subassembly, is provided with anchor rope anchor head simulation subassembly, stress deformation monitoring subassembly in the environmental simulation subassembly, its characterized in that: the environment simulation assembly comprises a box body, a cover plate, simulation mortar and simulation surrounding rock, wherein the top end of the box body is provided with an opening, the top end of the box body is connected with the cover plate, the cover plate is made of transparent materials, the simulation mortar and the simulation surrounding rock are filled in the box body, the simulation surrounding rock is positioned in the middle of the simulation mortar, and an anchor cable and anchor head simulation assembly is arranged in the simulation surrounding rock; the simulation assembly of the anchor head of the anchor cable comprises a simulation anchor cable, a simulation inner anchor head and a jack, wherein the volume of the simulation inner anchor head is half of the actual volume of the anchor head divided along the axis, the simulation inner anchor head is placed in the simulation surrounding rock, one end of the simulation inner anchor head is connected with one end of the simulation anchor cable, and the other end of the simulation anchor cable sequentially penetrates through the simulation surrounding rock and the side wall of the box body and then is connected with the jack; the stress deformation monitoring assembly comprises an anchor cable axial force monitoring sensor, a surrounding rock mortar deformation monitoring auxiliary line, a surrounding rock mortar internal stress monitoring pressure box, a video monitoring frame and a video monitor; anchor rope axial force monitoring sensor sets up the both ends at the simulation anchor rope, and surrounding rock mortar warp monitoring auxiliary line sets up the apron up end in the anchor head outside in the simulation, and the inside stress monitoring pressure cell of surrounding rock mortar has a plurality of and equidistant setting at the simulation mortar, in the simulation surrounding rock, video monitoring frame bottom and box or ground fixed connection, video monitoring frame top fixed connection video monitor, and the camera of video monitor is towards surrounding rock mortar warp monitoring auxiliary line.
2. The mechanical property testing device for the anchor cable and the inner anchor head as claimed in claim 1, wherein: the box body comprises a bottom plate, a front side plate, a rear side plate, a left side plate and a right side plate, wherein the bottom plate, the front side plate, the rear side plate, the left side plate and the right side plate are welded into a rectangular box body in a sealed state.
3. A device for testing the mechanical properties of a cable bolt and an inner head according to claim 2, wherein: one end of the jack is contacted with the left side plate, and the other end of the jack is connected with one end of the simulation anchor cable.
4. A device for testing the mechanical properties of a cable bolt and an inner head according to claim 3, wherein: the cross section of the simulated surrounding rock is semicircular, and an anchor hole for the simulated anchor cable to penetrate through is formed in the simulated surrounding rock.
5. A device for testing the mechanical properties of a cable bolt and an inner head according to claim 4, wherein: one end of the anchor cable is connected with one end of the anchor head close to the right side plate, and the other end of the anchor cable penetrates through the anchor head, the simulated surrounding rock and the side wall of the box body in sequence and then is connected with the jack.
6. A device for testing the mechanical properties of a cable bolt and an inner head according to claim 5, wherein: the surrounding rock mortar deformation monitoring auxiliary lines are two groups of scale marks which are carved on the upper end face of the cover plate and are vertical to each other, and each group of scale marks are two and are parallel to each other.
7. The device for testing mechanical properties of a cable bolt and an inner head as claimed in claim 6, wherein: and the surrounding rock mortar internal stress monitoring pressure boxes are arranged on the front side and the rear side below the anchor cable side by side.
8. The mechanical property testing device for the anchor cable and the inner anchor head as claimed in claim 7, wherein: the simulation anchor cable is a steel strand.
9. A method of testing a device for testing the mechanical properties of a cable bolt and an inner head according to claim 8, wherein: the method comprises the following steps:
s1, manufacturing simulated surrounding rocks with different strengths by adjusting the concrete proportion, and arranging anchor holes with different diameters and surrounding rock mortar internal stress monitoring pressure boxes in the simulated surrounding rocks;
s2, manufacturing different types of simulated inner anchor heads and simulated anchor cables through 3D printing or steel casting, placing the simulated inner anchor heads in simulated surrounding rock, arranging anchor cable axial force monitoring sensors at two ends of the simulated anchor cables, connecting the simulated inner anchor heads with one ends of the simulated anchor cables, and installing a jack after the other ends of the simulated anchor cables penetrate through an anchor hole and a left side plate;
s3, adjusting the proportion of cement mortar, manufacturing simulated mortar with different strengths, performing grouting operation in a box body, and arranging a surrounding rock mortar internal stress monitoring pressure box in the simulated mortar;
s4, depicting a surrounding rock mortar deformation monitoring auxiliary line on the upper end face of the cover plate, and installing a full-video monitoring frame and a video monitor;
and S5, performing anchor cable tensioning process simulation under different conditions by controlling the jack, and recording data changes of the anchor cable axial force monitoring sensor and the anchor cable axial force monitoring sensor in the tensioning process and deformation data of simulated mortar and simulated surrounding rock in real time, so as to obtain mechanical property results of the simulated anchor cable and the simulated inner anchor head.
CN201911189603.XA 2019-11-28 2019-11-28 Device and method for testing mechanical properties of anchor cable and inner anchor head Pending CN110749495A (en)

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CN201911189603.XA CN110749495A (en) 2019-11-28 2019-11-28 Device and method for testing mechanical properties of anchor cable and inner anchor head
AU2020103241A AU2020103241A4 (en) 2019-11-28 2020-11-04 Device for Testing Mechanical Characteristics of Anchor Cable and Inner Anchor Head, and Test Method Thereof

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Application Number Priority Date Filing Date Title
CN201911189603.XA CN110749495A (en) 2019-11-28 2019-11-28 Device and method for testing mechanical properties of anchor cable and inner anchor head

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115307948A (en) * 2022-08-15 2022-11-08 中铁西北科学研究院有限公司 Indoor test device for BFRP anchor rod anchoring system performance research under power environment

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117705577B (en) * 2023-12-11 2024-05-28 山西黎霍高速公路有限公司 Test device and method for simulating load bearing performance degradation of constant-resistance large-deformation anchor rod/cable end constant-resistance mechanism under tunnel fire disaster

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115307948A (en) * 2022-08-15 2022-11-08 中铁西北科学研究院有限公司 Indoor test device for BFRP anchor rod anchoring system performance research under power environment

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