CN219996119U - Device applied to measuring radial deformation of rock uniaxial test - Google Patents
Device applied to measuring radial deformation of rock uniaxial test Download PDFInfo
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- CN219996119U CN219996119U CN202321314291.2U CN202321314291U CN219996119U CN 219996119 U CN219996119 U CN 219996119U CN 202321314291 U CN202321314291 U CN 202321314291U CN 219996119 U CN219996119 U CN 219996119U
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- 238000012360 testing method Methods 0.000 title claims abstract description 44
- 239000011435 rock Substances 0.000 title claims abstract description 29
- 230000007246 mechanism Effects 0.000 claims abstract description 67
- 238000006073 displacement reaction Methods 0.000 claims description 13
- 238000000034 method Methods 0.000 abstract description 9
- 230000008569 process Effects 0.000 abstract description 3
- 230000008859 change Effects 0.000 description 6
- 238000005259 measurement Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 238000012935 Averaging Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
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Abstract
The utility model provides a device for measuring radial deformation of a rock uniaxial test, which comprises: a base; the two groups of stretching mechanisms are symmetrically arranged on the base, and can slide on the base to be relatively close to or far away from the base; the two ends of the chain mechanism are respectively fixed on the two groups of stretching mechanisms, and the chain mechanism is tightly clung to and wound on the sample due to the elasticity of the stretching mechanisms; the measuring mechanism is arranged on the base and measures the distance between the two stretching mechanisms. The device for measuring the radial deformation of the rock uniaxial test is characterized in that the chain mechanism is wound on the periphery of the sample, the chain mechanism is tightly wound on the sample by the stretching mechanism, the expansion deformation is generated during the test of the sample, the length of the chain mechanism wound on the sample is increased, the distance between the two groups of stretching mechanisms is reduced, and the distance between the two groups of stretching mechanisms is measured by the measuring mechanism in the process.
Description
Technical Field
The utility model relates to the technical field of rock measurement, in particular to a device applied to measuring radial deformation of a rock uniaxial test.
Background
Whether deformation of rock soil, concrete and pavement materials under the action of various stresses influences normal use of engineering is an important mechanical property, and the characterization index of the deformation is generally measured through an indoor rock mechanical property test, wherein the uniaxial compression deformation test is a test means, and meanwhile, a cylindrical test piece is in a standard test piece form of an indoor uniaxial and conventional triaxial test of the rock.
The uniaxial compression deformation test mainly aims to measure longitudinal strain and transverse strain of rock materials under the action of uniaxial stress, and draw a relation curve of stress, longitudinal strain and transverse strain, so as to determine the elastic modulus of the rock materials at different deformation stages, namely initial elastic modulus, tangential elastic modulus and secant elastic modulus.
Therefore, in the rock uniaxial compression deformation test, the measurement of the deformation is a key link, and two methods are commonly used at present: a resistance strain gauge method is disclosed, wherein the deformation of a sample is obtained by measuring the deformation of a resistance strain gauge stuck on the sample by using a resistance strain gauge, but the method has the defects of high technical requirement for sticking the strain gauge, complicated testing means and breaking of the sample caused by local rupture of the sample; the other is a displacement sensor method, which is the most advanced and most accurate testing method at present, and the deformation measuring extensometer of the method has various structures, wherein the LVDT displacement sensor is more common, the axial deformation is generally measured by adopting a 180-degree arrangement averaging method of two LVDT sensors, the radial deformation is generally measured by adopting a chain to measure a sample, the LVDT sensors are fixed at two ends of the chain, the parameters such as the diameter of the chain, the circumference change, the strain and the like are deduced through a formula, and the rock material is anisotropic, so that certain deformation cannot be effectively counted into deformation measurement, and the measurement has a certain error.
Disclosure of Invention
In view of the above, the present utility model aims to provide a device for measuring radial deformation of rock uniaxial test, so as to improve accuracy of radial measurement data of a sample.
In order to achieve the above purpose, the technical scheme of the utility model is realized as follows:
an apparatus for measuring radial deformation of a rock uniaxial test, comprising:
a base;
the two groups of stretching mechanisms are symmetrically arranged on the base, and the two groups of stretching mechanisms can slide on the base to be relatively close to or far away from the base;
the two ends of the chain mechanism are respectively fixed on the two groups of stretching mechanisms, and the chain mechanism is tightly wound on the sample due to the elasticity of the stretching mechanisms;
and the measuring mechanism is arranged on the base and is used for measuring the distance between the two stretching mechanisms.
Further, the base adopts linear guide, and the stretching mechanism comprises a first spring seat fixed on the base, a second spring seat arranged on the sliding block, and a stretching spring arranged between the first spring seat and the second spring seat.
Further, the chain mechanism comprises a middle chain and a side chain, one end of the middle chain is fixed with the side chain through a pin shaft, the other end of the middle chain is fixed on one of the second spring seats, and the other end of the side chain is fixed with the other second spring seat.
Further, two side chains are arranged and are respectively positioned at two sides of the middle chain.
Further, the measuring mechanism comprises a fixed seat arranged on one of the second spring seats and a grating displacement sensor arranged on the fixed seat.
Further, another second spring seat is provided with a zeroing bracket, and the zeroing bracket is provided with a zeroing screw rod and a zeroing nut sleeved on the zeroing screw rod.
Compared with the prior art, the utility model has the following advantages:
the device for measuring the radial deformation of the rock uniaxial test, disclosed by the utility model, has the advantages that the chain mechanism is wound on the periphery of the sample, the chain mechanism is tightly wound on the sample by the stretching mechanism so as to ensure the accuracy of basic radial data of the sample, radial expansion deformation is generated during the sample test, the length of the chain mechanism wound on the sample is increased, the interval between two groups of stretching mechanisms is reduced, and the interval between the two groups of stretching mechanisms is measured by the measuring mechanism in the process.
Drawings
The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model, wherein the words of front and back, top and bottom, etc. are used to indicate relative position and are not intended to limit the utility model unduly. In the drawings:
FIG. 1 is a schematic view of the overall structure of a device for measuring radial deformation of rock uniaxial test according to an embodiment of the present utility model;
FIG. 2 is a schematic view of another construction for measuring radial deformation of rock uniaxial test according to an embodiment of the present utility model;
FIG. 3 is a schematic view of a structure for measuring radial deformation of a rock uniaxial test according to an embodiment of the present utility model;
fig. 4 is a graph showing the distribution and geometry of the chain according to the embodiment of the present utility model.
Reference numerals illustrate:
1. a base; 10. a linear guide rail; 11. a slide block; 2. a stretching mechanism; 20. a first spring seat; 21. a second spring seat; 22. a tension spring; 3. a chain mechanism; 30. a middle chain; 31. a side chain; 32. a pin shaft; 4. a measuring mechanism; 40. a fixing seat; 41. a grating displacement sensor; 42. zeroing the bracket; 43. zero setting screw; 44. zero setting nut; 5. and (3) a sample.
Detailed Description
It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other.
In the description of the present utility model, it should be noted that, if terms indicating an orientation or positional relationship such as "upper", "lower", "inner", "outer", etc. are presented, they are based on the orientation or positional relationship shown in the drawings, only for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or element to be referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model. In addition, the terms "first," "second," and the like, if any, are also used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Furthermore, in the description of the present utility model, the terms "mounted," "connected," and "connected," are to be construed broadly, unless otherwise specifically defined. For example, the connection can be fixed connection, detachable connection or integrated connection; 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 utility model can be understood by those of ordinary skill in the art in combination with specific cases.
The utility model will be described in detail below with reference to the drawings in connection with embodiments.
The embodiment relates to a device for measuring radial deformation of a rock uniaxial test, which is structurally characterized by comprising a base 1, two groups of stretching mechanisms 2 and a chain mechanism 3 which are symmetrically arranged on the base 1.
Wherein, the base 1 adopts a linear guide rail 10, and the two groups of stretching mechanisms 2 can slide on the base 1 to relatively approach or separate; the two ends of the chain mechanism 3 are respectively fixed on the two groups of stretching mechanisms 2, and the chain mechanism 3 is tightly wound on the sample 5 due to the elasticity of the stretching mechanisms 2; the measuring mechanism 4 is arranged on the base 1 and measures the distance between the two stretching mechanisms 2.
As designed above, the chain mechanism 3 is wound around the periphery of the sample 5, the chain mechanism 3 is tightly wound on the sample 5 by the stretching mechanism 2 to ensure the accuracy of basic radial data of the sample 5, radial expansion deformation is generated during the test of the sample 5, the length of the chain mechanism 3 wound on the sample 5 is increased, the interval between the two groups of stretching mechanisms 2 is reduced, and the interval between the two groups of stretching mechanisms 2 is measured by the measuring mechanism 4 in the process.
Based on the above overall design, an exemplary structure of the device for measuring radial deformation of rock uniaxial test according to the present embodiment is shown in fig. 1 to 3, and the stretching mechanism 2 includes a first spring seat 20 fixed on the base 1, a second spring seat 21 provided on the slider 11, and a stretching spring 22 located between the first spring seat 20 and the second spring seat 21. Specifically, the first spring seat 20 is fixed, and the extension spring 22 between the second spring seat 21 and the first spring seat 20 is extended due to the change of the length of the chain mechanism 3 when the sample 5 expands, and the second spring seat 21 can move along with the slider 11 on the linear guide rail 10, so that the whole structure is simple, and the operation is convenient. To protect the extension spring 22, it is preferable in this embodiment that a sleeve is provided outside the extension spring 22.
In this embodiment, the chain mechanism 3 includes a middle chain 30 and a side chain 31, one end of the middle chain 30 is fixed to the side chain 31 through a pin 32, the other end is fixed to one of the second spring seats 21, and the other end of the side chain 31 is fixed to the other second spring seat 21. The middle chain 30 and the side chain 31 are horizontally wound around the periphery of the sample 5, and in order to improve the stability of the chain mechanism 3, the side chains 31 are provided with two chains, and are respectively located at two sides of the middle chain 30, and the middle chain 30 and the side chain 31 are tightly attached to the surface of the sample 5 under the action of the tension spring 22.
It should be noted that, the measuring mechanism 4 includes a fixed seat 40 disposed on a second spring seat 21 thereof, and a grating displacement sensor 41 disposed on the fixed seat 40, a zeroing support 42 is disposed on another second spring seat 21, a zeroing screw 43 and a zeroing nut 44 sleeved on the zeroing screw 43 are disposed on the zeroing support 42, the zeroing support 42 is fixed on the first spring seat 20, the zeroing screw 43 is screwed into the zeroing support 42, the locking nut is sleeved on the zeroing screw 43, the grating displacement sensor 41 is mounted on the fixed seat 40, and a casing of the grating displacement sensor 41 penetrates into an opening clamp thereof and is then clamped by a bolt.
During the rock uniaxial test, the sample 5 generates radial expansion deformation, when the sample 5 is deformed radially, namely the circumference of the sample 5 is changed when the volume of the sample is changed, the distance between the second spring seats 21 on the left side and the right side is reduced, the contact length of the chain and the sample 5 is changed, the middle chain 30 and the side chain 31 can drive the grating displacement sensors 41 at the two ends to change relatively with the zeroing screw 43, the grating displacement sensors 41 measure the circumference change of the sample 5, and the radial strain of the sample 5 is calculated.
Specifically, the distribution and geometric relationship of the chains before and after radial expansion of the test piece 5 are shown in fig. 4, where Ri is the radius before deformation of the test piece, rf is the radius after deformation of the test piece, li is the distance between the side chain 31 and the end of the middle chain 30 before deformation of the test piece, lf is the distance between the side chain 31 and the end of the middle chain 30 after deformation of the test piece, r is the radius of the chain roller, Δl is the displacement amount between the side chain 31 and the end of the middle chain 30 before deformation of the test piece, ci is the perimeter before deformation of the test piece 5, cf is the perimeter after deformation of the test piece 5, and Δc is the change amount of the perimeter of the test piece 5. From the geometrical relationship of fig. 4:
Ci＝2πRi
Cf＝2πRf
ΔL＝|Lf-Li|＝2π(Rf+r)-2π(Ri+r)＝2π(Rf-Ri)
ΔC＝Cf-Ci＝2π(Rf-Ri)＝ΔL
ΔR＝Rf-Ri＝ΔL/(2π)
the device for measuring radial deformation of rock uniaxial test in this embodiment is used, when the device is used, the middle chain 30 and the side chain 31 are wound on the sample 5, the middle chain 30 and the side chain 31 are tightly wound outside the sample 5 due to the tension of the tension spring 22, the sample 5 generates radial expansion deformation in the test, when the sample 5 is radially deformed, namely, the circumference of the sample is also changed when the volume of the sample changes, the distance between the second spring seats 21 on the left side and the right side is reduced, the contact length of the chain and the sample 5 can be changed, the positions of the grating displacement sensors 41 and the zeroing screws 43 at two ends are driven by the middle chain 30 and the side chain 31 to relatively change, the circumference of the sample 5 is measured by the grating displacement sensors 41, the radial strain of the sample 5 is calculated, and the accuracy of radial measurement data of the sample 5 can be improved.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.
Claims (6)
1. An apparatus for measuring radial deformation in a uniaxial test of rock, comprising:
a base (1);
the two groups of stretching mechanisms (2) are symmetrically arranged on the base (1), and the two groups of stretching mechanisms (2) can slide on the base (1) to be relatively close to or far away from each other;
the two ends of the chain mechanism (3) are respectively fixed on the two groups of the stretching mechanisms (2), and the chain mechanism (3) is tightly wound on the sample (5) due to the elasticity of the stretching mechanisms (2);
and the measuring mechanism (4) is arranged on the base (1) and is used for measuring the distance between the two stretching mechanisms (2).
2. The device for measuring radial deformation of rock uniaxial test of claim 1 wherein: the base (1) adopts a linear guide rail (10), and the stretching mechanism (2) comprises a first spring seat (20) fixed on the base (1), a second spring seat (21) arranged on the sliding block (11), and a stretching spring (22) arranged between the first spring seat (20) and the second spring seat (21).
3. The device for measuring radial deformation of rock uniaxial test of claim 2 wherein: the chain mechanism (3) comprises a middle chain (30) and a side chain (31), one end of the middle chain (30) is fixed with the side chain (31) through a pin shaft (32), the other end of the middle chain is fixed on one second spring seat (21), and the other end of the side chain (31) is fixed with the other second spring seat (21).
4. A device for measuring radial deformation of rock uniaxial test as claimed in claim 3, wherein: the side chains (31) are arranged in two and are respectively positioned at two sides of the middle chain (30).
5. The device for measuring radial deformation of rock uniaxial test of claim 2 wherein: the measuring mechanism (4) comprises a fixed seat (40) arranged on one second spring seat (21), and a grating displacement sensor (41) arranged on the fixed seat (40).
6. The device for measuring radial deformation of rock uniaxial test of claim 5 wherein: the other second spring seat (21) is provided with a zeroing bracket (42), and the zeroing bracket (42) is provided with a zeroing screw rod (43) and a zeroing nut (44) sleeved on the zeroing screw rod (43).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321314291.2U CN219996119U (en) | 2023-05-26 | 2023-05-26 | Device applied to measuring radial deformation of rock uniaxial test |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321314291.2U CN219996119U (en) | 2023-05-26 | 2023-05-26 | Device applied to measuring radial deformation of rock uniaxial test |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219996119U true CN219996119U (en) | 2023-11-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321314291.2U Active CN219996119U (en) | 2023-05-26 | 2023-05-26 | Device applied to measuring radial deformation of rock uniaxial test |
Country Status (1)
| Country | Link |
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| CN (1) | CN219996119U (en) |
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2023
- 2023-05-26 CN CN202321314291.2U patent/CN219996119U/en active Active
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