Measuring device for detecting radial displacement of geotechnical uniaxial sample
By designing a combination device of support rod and displacement meter, the accuracy and cost problems of measuring the radial displacement of rock uniaxial samples in the prior art are solved, and real-time multi-position monitoring and high-precision measurement are realized.
Patent Information
- Application Number
- CN202510441763.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-09
- Publication Date
- 2025-07-08
AI Technical Summary
In the prior art, when measuring the radial displacement of rock uniaxial samples, there are problems such as high cost, susceptible to environmental influences, low accuracy or inability to capture local deformation.
A device including a support rod, a displacement meter and a measuring unit is designed, through the combination of a sliding track and a support rod groove, allowing the measuring unit to measure radial displacement in multiple positions on a single-axis sample, and the measurement is performed using the contact of the displacement meter to contact the sample in a slight contact.
Real-time monitoring of multi-position radial displacement is realized, saving time and cost, and can accurately measure radial displacement at any position of a single-axis sample, avoid external force interference and improve measurement accuracy.
Smart Images
Figure CN120274694A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a measuring device for detecting the radial displacement of a geotechnical uniaxial specimen. Background Art
[0002] As an important natural resource, rock widely exists in the earth's crust and plays an irreplaceable role in fields such as engineering construction and resource development. The deformation of rock is one of the core issues in the field of rock mechanics, which is not only related to the safety and stability of engineering, but also involves the effective development and utilization of resources. In the laboratory, in order to detect the deformation mechanism of a certain rock specimen, uniaxial compression tests are often used. The purpose of the uniaxial compression test is to measure the mechanical behavior and properties of the rock specimen under unidirectional pressure, and by plotting the stress-strain curve, to calculate key basic parameters such as the compressive strength, elastic modulus, and Poisson's ratio of the rock. Therefore, for the uniaxial compression test, the measurement of the axial deformation and radial deformation of the rock is particularly important.
[0003] Currently, there are mainly three methods for measuring the deformation amount: one is the resistance strain gauge method, where the strain gauge is pasted on the surface of the specimen, and the axial or radial strain of the specimen is reflected by the change in the resistance value. It has the advantages of low cost and being suitable for small deformation scenarios, but this method is limited by being easily affected by temperature and humidity, and may fall off or fail under high stress conditions. The second is the extensometer method. The mechanical extensometer clamps the specimen through a knife edge and measures the deformation occurring within the gauge section using a lever or an electronic sensor. The operation is simple and the data is reliable, but it can only measure the average strain within the gauge section, cannot capture local deformation, and is prone to slipping during large deformations. The third is the displacement gauge method. For example, the relatively advanced LVDT displacement gauge currently, generates a voltage signal through the displacement of the iron core in the magnetic field and converts it into a displacement amount. The accuracy is extremely high, up to the micron level, and the stability is good, but the disadvantage is that it needs to contact the specimen and is prone to introducing local stress interference. Summary of the Invention
[0004] In view of this, the present invention aims to provide a measuring device for detecting the radial displacement of a geotechnical uniaxial specimen. This device can measure the radial changes at different positions on a single uniaxial specimen, simultaneously measure multiple groups of radial displacements, and obtain the radial displacement of the monitored specimen in real time, with the advantages of saving time and cost and optimizing the measurement process.
[0005] To achieve the above object, the present invention provides the following technical solutions:
[0006] A measuring device for detecting radial displacement of a geotechnical uniaxial specimen, comprising a support rod 1, a displacement meter 2 and a measuring unit 6; the measuring unit 6 comprises an inner arc metal sheet 51, an outer arc metal sheet 52 and a side wall metal sheet 50; the arc-shaped outer surface of the inner arc metal sheet 51 of the measuring unit 6 cooperates with the outer surface of the uniaxial specimen and can be fitted together; the outer surface of the outer arc metal sheet 52 is fixedly connected with the sliding track 4, a displacement meter 2 is arranged between the inner arc metal sheet 51 and the outer arc metal sheet 52, a contact 22 of the displacement meter 2 extends out of the inner arc metal sheet 51, and is in contact with the uniaxial specimen, so as to measure the radial strain of the specimen;
[0007] The support rod 1 is provided with a support rod groove 11, the measuring unit 6 is detachably connected to the support rod 1 via a sliding track 4, and the measuring unit 6 is detachably connected to the uniaxial specimen;
[0008] Changing the engagement position of the sliding track 4 and the support rod groove 11 can enable the measuring unit 6 to move vertically and horizontally.
[0009] Further: the support rod 1 includes a support platform 12 and a vertical pole 10 arranged on the support platform 12, the vertical pole 10 is fixedly connected to the support platform 12, the vertical pole 10 is provided with the support rod groove 11, the support rod groove 11 is evenly distributed in the vertical direction of the vertical pole 10, the sliding track 4 can be embedded in the support rod groove 11, the sliding track 4 can move horizontally in the support rod groove 11, and the measuring unit 6 can be moved vertically by changing the position of the sliding track 4.
[0010] Furthermore, there are multiple measuring units 6, and after each measuring unit is connected to the uniaxial specimen through the sliding track 4 and the support rod 1, they are combined together to measure the radial displacement of the uniaxial specimen in one circle.
[0011] Furthermore, adjacent measuring units 6 are connected via the side wall metal sheet 50 .
[0012] Further: according to the size of the displacement meter 2, a guide groove is fixedly connected inside the measuring unit 6 along the radial extension line of the uniaxial specimen, for placing the displacement meter 2 for measuring the radial displacement of the uniaxial specimen.
[0013] Further: the guide groove includes a left longitudinal metal sheet 53 and a right longitudinal metal sheet 54, the left longitudinal metal sheet 53 has holes evenly distributed, the right longitudinal metal sheet 54 is fixedly connected with a longitudinal metal strip 55, the longitudinal metal strip 55 is provided with evenly distributed holes corresponding to the left longitudinal metal sheet 53, the left longitudinal metal sheet 53 and the right longitudinal metal sheet 54 are fixedly connected through the holes, and a rectangular cavity is formed after fixation for placing the displacement meter 2.
[0014] Advantages of the present invention: Through the arrangement of the support rod, the measuring unit can move freely on the support rod to adjust the position of the measuring unit, detect the radial displacement at multiple positions on the uniaxial specimen, monitor the radial displacement of the specimen in real time, and accurately measure the radial displacement at any position on the uniaxial specimen. Description of the Drawings
[0015] Figure 1 is a perspective structural view of the radial displacement measuring device;
[0016] Figure 2 is a top view of the measuring device;
[0017] Figure 3 is Figure 1 a perspective structural view of the displacement gauge in
[0018] Figure 4 is Figure 1 a perspective structural view of the support rod in
[0019] Figure 5 is Figure 1 a rear view of the measuring unit with the sliding track as the main observation object in
[0020] Figure 6 is Figure 1 a perspective structural view of six measuring devices that can surround the uniaxial specimen for one week in
[0021] Figure 7 is Figure 1 a top view of six measuring devices that can surround the uniaxial specimen for one week in
[0022] Reference numerals: 1, support rod; 10, vertical upright rod; 11, groove; 12, support platform; 2, displacement gauge; 20, electric wire; 21, displacement meter; 22, contact; 30, sidewall metal sheet hole; 31, inner and outer arc metal sheet holes; 32, longitudinal metal strip hole; 4, sliding track; 40, upper sliding track; 41, lower sliding track; 50, sidewall metal sheet; 51, inner arc metal sheet; 52, outer arc metal sheet; 53, left longitudinal metal sheet; 54, right longitudinal metal sheet; 55, longitudinal metal strip; 6, measuring unit; 7, uniaxial specimen; 8, measuring device. Detailed Embodiments
[0023] Refer to Figures 1 to 7As shown, a device for measuring radial deformation of a specimen in a uniaxial test according to the present embodiment includes a support rod 1, a displacement meter 2 and a measuring unit 6. The measuring unit 6 and the support rod 1 can be detachably connected via a sliding track 4, and the measuring unit 6 can be moved vertically and horizontally by changing the engagement position of the sliding track 4 and the groove 11. The measuring unit 6 and the uniaxial specimen can be detachably connected, and the inner arc metal sheet 51 of the measuring unit 6 can fit the uniaxial specimen. The displacement meter 2 is placed inside the measuring unit 6 and fastened with bolts, and the contact 22 of the displacement meter 2 is in light contact with the uniaxial specimen 7.
[0024] On the basis of the above-mentioned embodiment, the measuring unit 6 has an inner arc metal sheet 51, an outer arc metal sheet 52 and a side wall metal sheet 50, which is shaped like a ring divided into six equal parts. The equally divided units are identical to each other, and any unit is a measuring unit 6. The central angle of each measuring unit 6 is 60°. The six measuring units 6 can be combined together to measure the radial displacement of the uniaxial specimen 7 for one circle. The inner and outer arcs and the side walls of the measuring unit 6 are wrapped with metal sheets, and the inside of the device is hollowed out. The inner arc metal sheet 51 of the measuring unit 6 can be fitted together with the uniaxial specimen 7. The outer arc metal sheet 52 is welded with a sliding track 4, which can be embedded in the support rod 1. The displacement meter 2 is fixed inside the measuring unit 6 by bolt locking, and the contact 22 extends out of the inner arc metal sheet 51 to make contact and connection with the uniaxial specimen 7 to measure the radial strain of the specimen 7.
[0025] On the basis of the above embodiment, the support rod 1 includes a support platform 12 and a vertical pole 10 arranged on the support platform 12, the vertical pole 10 and the support platform 12 are fixedly connected by welding, the vertical pole 10 is provided with a groove 11, the groove 11 is evenly distributed in the vertical direction of the vertical pole 10, the outer arc metal sheet 52 is welded with a sliding track 4, which can be embedded in the groove 11 of the support rod 1, the sliding track 4 can be moved arbitrarily in the groove 11, and the measuring unit 6 can be moved vertically by changing the position of the sliding track 4.
[0026] The above improvements are as follows: Figure 6 and Figure 7 As shown: six identical measuring units 6 form a measuring device 8, the inner arc metal sheet 51 of the measuring unit 6 forms a circle that can tightly clamp the uniaxial specimen 7, and the position of the measuring device 8 can be changed by placing the sliding track 4 into different grooves 11, so that all radial displacements of any vertical position of the uniaxial specimen 7 can be accurately measured, and any number of the measuring units 6 can be changed to perform comparative tests on radial displacements at different positions.
[0027] Based on the above embodiments, there is a hole 30 at the center of the sidewall metal sheet 50. The two measuring units 6 are bolted together through the hole 30 on the sidewall metal sheet 50, and the bolts are fastened together.
[0028] Based on the above embodiments, there are a left longitudinal metal sheet 53 and a right longitudinal metal sheet 54 at the center of the measuring unit 6. Holes 32 are evenly distributed in the lower half of the left longitudinal metal sheet 53. A longitudinal metal strip 55 is welded to the lower half of the right longitudinal metal sheet 54. The longitudinal metal strip 55 has evenly distributed holes 32 corresponding to the left longitudinal metal sheet 53. The two metal sheets are fixedly connected by bolts through the holes 32. After fixing, a rectangular cavity is formed, which can be used to place the displacement gauge 2.
[0029] Based on the above embodiments, the displacement gauge 2 is placed in the cavity. The contact 22 of the displacement gauge 2 gently contacts the uniaxial specimen 7 through the hole 31 of the inner arc metal sheet 51. The wire 20 of the displacement gauge 2 is connected to the power supply through the hole 31 of the outer arc metal sheet 52.
[0030] Based on the above embodiments, the displacement gauge 2 includes a displacement meter 21 and a contact 22. One end of the contact 22 is inserted into the displacement meter 21 and can freely expand and contract in the displacement meter 21, and the other end gently contacts the surface of the uniaxial specimen 7 to measure the radial displacement of the uniaxial specimen 7.
[0031] The above improvement is specifically as follows: As Figure 1 shown, the inside of the measuring unit 6 is in a hollow state. The inner and outer arcs and the sidewalls surrounding the measuring unit 6 are all wrapped with metal sheets. Two metal sheets and metal strips are welded from the center of the measuring unit 6 to support the displacement gauge. As Figure 4 shown, the groove 11 on the support rod can be fitted into the sliding track 4 on the outer arc metal sheet 52 of the measuring unit 6. The sliding track 4 is symmetrically fixed on the outer arc metal sheet 52. As Figure 5 shown, there are the same sliding tracks 4 above and below, which can enable the support rod 1 to apply sufficient force to keep the measuring unit 6 in a balanced state. By taking out the sliding track 4 and fitting it into another groove 11, the measuring unit 6 can be vertically moved. According to the need, the measuring unit 6 can be placed at the position to be measured, and the local measurement of any position of the uniaxial specimen 7 can be completed. As Figure 5As shown, the contact 22 extends from inside the measuring unit 6 and gently contacts the surface of the uniaxial specimen 7, which can prevent external force from being applied due to direct contact, resulting in a smaller measured radial displacement. The contact 22 can freely expand and contract within the displacement gauge 21. When the test is carried out and the uniaxial specimen 7 changes radially, the contact 22 will synchronously contract outward, and the contraction distance is the change amount of the radial deformation. The reading on the displacement gauge 21 is the radial displacement of the uniaxial specimen 7, so that the radial displacement of the uniaxial specimen 7 can be monitored in real time.
[0032] The above are only the preferred embodiments of the present invention and do not limit the present invention. Any modifications, equivalent changes and decorations made within the spirit and principle of the present invention should fall within the protection scope of the present invention.
[0033] To further elaborate on the technical means and effects adopted by the present invention to achieve the predetermined purpose, the following describes in detail the specific implementation manners, structures, features and effects according to the present invention in combination with the accompanying drawings and preferred embodiments.
[0034] Refer to Figures 1 to 7 As shown, a device for measuring the radial deformation of a specimen in a uniaxial test according to this embodiment includes a support rod 1, a displacement gauge 2 and a measuring unit 6. The measuring unit 6 and the support rod 1 can be detachably connected through a sliding track 4. Changing the fitting position of the sliding track 4 and the groove 11 can make the measuring unit 6 move vertically and horizontally. The measuring unit 6 is detachably connected to the uniaxial specimen. The inner arc metal sheet 51 of the measuring unit 6 can fit with the uniaxial specimen. The displacement gauge 2 is placed inside the measuring unit 6 and fastened with bolts. The contact 22 of the displacement gauge 2 gently contacts the uniaxial specimen 7.
[0035] On the basis of the above embodiment, the measuring unit 6 has an inner arc metal sheet 51, an outer arc metal sheet 52 and a side wall metal sheet 50, which is shaped like a ring divided into six equal parts, and the divided units are pairwise the same. Any unit is the measuring unit 6, and the central angle of each measuring unit 6 is 60°. Six measuring units 6 combined together can measure the radial displacement of the uniaxial specimen 7 in one week. The inner and outer arcs and the side walls of the measuring unit 6 are wrapped with metal sheets, and the inside of the device is hollowed out. The inner arc metal sheet 51 of the measuring unit 6 can fit with the uniaxial specimen 7. The outer arc metal sheet 52 is welded with a sliding track 4, which can be fitted on the support rod 1. The displacement gauge 2 is fixed inside the measuring unit 6 by bolt tightening. The contact 22 extends out of the inner arc metal sheet 51 and contacts and connects with the uniaxial specimen 7 for measuring the radial strain of the specimen 7.
[0036] On the basis of the above embodiment, the support rod 1 includes a support platform 12 and a vertical pole 10 arranged on the support platform 12, the vertical pole 10 and the support platform 12 are fixedly connected by welding, the vertical pole 10 is provided with a groove 11, the groove 11 is evenly distributed in the vertical direction of the vertical pole 10, the outer arc metal sheet 52 is welded with a sliding track 4, which can be embedded in the groove 11 of the support rod 1, the sliding track 4 can be moved arbitrarily in the groove 11, and the measuring unit 6 can be moved vertically by changing the position of the sliding track 4.
[0037] The above improvements are as follows: Figure 6 and Figure 7 As shown: six identical measuring units 6 form a measuring device 8, the inner arc metal sheet 51 of the measuring unit 6 forms a circle that can tightly clamp the uniaxial specimen 7, and the position of the measuring device 8 can be changed by placing the sliding track 4 into different grooves 11, so that all radial displacements of any vertical position of the uniaxial specimen 7 can be accurately measured, and any number of the measuring units 6 can be changed to perform comparative tests on radial displacements at different positions.
[0038] On the basis of the above-mentioned embodiment, a hole 30 is provided at the center of the side wall metal sheet 50 , and the two measuring units 6 are connected by bolts through the hole 30 on the side wall metal sheet 50 , and are fastened together by the bolts.
[0039] On the basis of the above embodiment, a left longitudinal metal sheet 53 and a right longitudinal metal sheet 54 are provided at the center of the measuring unit 6, the lower half of the left longitudinal metal sheet 53 is provided with evenly distributed holes 32, the lower half of the right longitudinal metal sheet 54 is welded with a longitudinal metal strip 55, the longitudinal metal strip 55 has evenly distributed holes 32 corresponding to the left longitudinal metal sheet 53, the two metal sheets are fixedly connected by bolts through the holes 32, and a rectangular cavity is formed after being fixed, which can be used to place the displacement meter 2.
[0040] Based on the above embodiment, the displacement meter 2 is placed in the cavity, the contact 22 of the displacement meter 2 gently contacts the uniaxial specimen 7 through the hole 31 of the inner arc metal sheet 51, and the wire 20 of the displacement meter 2 is connected to the power supply through the hole 31 of the outer arc metal sheet 52.
[0041] Based on the above embodiment, the displacement meter 2 includes a displacement meter 21 and a contact 22. One end of the contact 22 is inserted into the displacement meter 21 and can freely extend and retract in the displacement meter 21. The other end of the contact 22 gently contacts the surface of the uniaxial sample 7 to measure the radial displacement of the uniaxial sample 7.
[0042] The above improvements are as follows: Figure 1As shown, the interior of the measuring unit 6 is hollow. The inner and outer arcs and side walls surrounding the measuring unit 6 are wrapped with metal sheets. Two metal sheets and a metal strip are welded from the center of the measuring unit 6 inside to support the displacement gauge. As Figure 4 shown, the groove 11 on the support rod can be fitted into the sliding track 4 on the outer arc metal sheet 52 of the measuring unit 6. The sliding track 4 is symmetrically fixed on the outer arc metal sheet 52. As Figure 5 shown, there are the same sliding tracks 4 above and below, which can enable the support rod 1 to apply sufficient force to keep the measuring unit 6 in a balanced state. By removing the sliding track 4 and fitting it into another groove 11, the measuring unit 6 can be vertically moved. According to the need, the measuring unit 6 can be placed at the position to be measured, and the local measurement of any position of the uniaxial specimen 7 can be completed. As Figure 5 shown, the contact 22 extends from the inside of the measuring unit 6 and gently contacts the surface of the uniaxial specimen 7, which can prevent external force from being applied due to direct contact, resulting in a smaller measured radial displacement. The contact 22 can freely expand and contract in the displacement gauge 21. When the test is carried out and the uniaxial specimen 7 changes radially, the contact 22 will synchronously contract outward, and the contraction distance is the change amount of the radial deformation. The reading on the displacement gauge 21 is the radial displacement of the uniaxial specimen 7, so that the radial displacement of the uniaxial specimen 7 can be monitored in real time.
[0043] The above are only the preferred embodiments of the present invention and do not limit the present invention. Any modification, equivalent change and modification made within the spirit and principle of the present invention should fall within the protection scope of the present invention.
Claims
1. A measuring device for detecting the radial displacement of a geotechnical uniaxial specimen, characterized in that: It includes a support rod (1), a displacement gauge (2) and a measurement unit (6); the measurement unit (6) includes an inner arc metal sheet (51), an outer arc metal sheet (52) and a side wall metal sheet (50); the arc-shaped outer surface of the inner arc metal sheet (51) of the measurement unit (6) cooperates with the outer surface of the uniaxial specimen and can fit together; the outer surface of the outer arc metal sheet (52) is fixedly connected with the sliding track (4), a displacement gauge (2) is arranged between the inner arc metal sheet (51) and the outer arc metal sheet (52), and the contact (22) of the displacement gauge (2) extends out of the inner arc metal sheet (51) and is in contact connection with the uniaxial specimen for measuring the radial strain of the specimen. The support rod (1) is provided with a support rod groove (11), the measurement unit (6) is detachably connected to the support rod (1) through the sliding track (4), and the measurement unit (6) is detachably connected to the uniaxial specimen. Changing the fitting position of the sliding track (4) and the support rod groove (11) can make the measurement unit (6) move vertically and horizontally.
2. The measuring device for detecting the radial displacement of a geotechnical uniaxial specimen according to claim 1, wherein: The support rod (1) includes a support platform (12) and a vertical upright rod (10) arranged on the support platform (12), the vertical upright rod (10) is fixedly connected to the support platform (12), the support rod groove (11) is arranged on the vertical upright rod (10), the support rod grooves (11) are evenly distributed in the vertical direction of the vertical upright rod (10), and the sliding track (4) can be fitted on the support rod groove (11), and the sliding track (4) can move horizontally in the support rod groove (11). By changing the position of the sliding track (4), the measurement unit (6) can move vertically.
3. A measuring device for detecting the radial displacement of a geotechnical uniaxial specimen according to claim 1, characterized in that: There are multiple measurement units (6). After each measurement unit is connected to the uniaxial specimen through the sliding track (4) and the support rod (1) and surrounded together, the radial displacement of the uniaxial specimen for one week can be measured.
4. The measuring device for detecting the radial displacement of a geotechnical uniaxial specimen according to claim 3, wherein: Adjacent measurement units (6) are connected by the side wall metal sheet (50).
5. The measuring device for detecting the radial displacement of a geotechnical uniaxial specimen according to claim 1, wherein: According to the size of the displacement gauge (2), a guide groove is fixedly connected inside the measurement unit (6) along the radial extension line of the uniaxial specimen for placing the displacement gauge (2) for measuring the radial displacement of the uniaxial specimen.
6. The measuring device for detecting the radial displacement of a geotechnical uniaxial specimen according to claim 5, characterized in that: The guide groove includes a left longitudinal metal sheet (53) and a right longitudinal metal sheet (54). The left longitudinal metal sheet (53) is evenly distributed with holes, the right longitudinal metal sheet (54) is fixedly connected with a longitudinal metal strip (55), and the longitudinal metal strip (55) is provided with evenly distributed holes corresponding to the left longitudinal metal sheet (53). The left longitudinal metal sheet (53) and the right longitudinal metal sheet (54) are fixedly connected through the holes. After being fixed, a rectangular cavity is formed for placing the displacement gauge (2).