CN114279830A - Rock anisotropic tensile strength testing device and using method thereof - Google Patents
Rock anisotropic tensile strength testing device and using method thereof Download PDFInfo
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- CN114279830A CN114279830A CN202111392957.1A CN202111392957A CN114279830A CN 114279830 A CN114279830 A CN 114279830A CN 202111392957 A CN202111392957 A CN 202111392957A CN 114279830 A CN114279830 A CN 114279830A
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Abstract
The invention discloses a rock anisotropy tensile strength testing device and a use method thereof, wherein the device is arranged on a universal testing machine, a workbench of the universal testing machine is provided with a pressure box, a cross beam is provided with a dowel bar, and the pressure box is internally provided with a mounting hole capable of transversely placing a rock sample; the dowel bar can apply pressure to the pressure box, the workbench is also provided with an annular dial, and the axis of the annular dial is superposed with the axis of a rock sample placed in the pressure box; the device can realize Brazilian splitting loading of natural rock masses in different directions, and can carry out the test of testing the anisotropic tensile strength of the rock masses in actual engineering, thereby knowing the mechanical property of rock tension failure and providing a test foundation for engineering construction and design.
Description
Technical Field
The invention relates to the field of rock tensile strength testing, in particular to a rock anisotropic tensile strength testing device and a using method thereof.
Background
In actual engineering, the natural rock has obvious anisotropic characteristics due to the fact that structural surfaces, microcracks, microporosity and the like are randomly distributed in the natural rock under the action of a geological structure; in the engineering, most rocks are in a tension-compression stress state, the tension failure mode is common, and particularly after the rocks are excavated and unloaded, rock blocks are peeled off from two sides of a chamber. Therefore, the acquisition of the tensile strength index of the rock has very important significance on actual engineering construction and design. At present, the indoor rock Brazilian splitting test is a test method for indirectly acquiring the tensile mechanical strength of the rock. The anisotropic characteristics of the natural rock mass are considered, the tensile strength parameters of the rock in different directions are accurately obtained, and the tensile failure mechanism of the rock can be deeply understood and known. Therefore, the research on the mechanical test of the anisotropic tensile strength of the rock has not only theoretical significance, but also great engineering practical significance.
Disclosure of Invention
In view of the technical defects, the invention aims to provide a rock anisotropic tensile strength testing device and a using method thereof, which can be used for carrying out anisotropic tensile strength mechanical test research on rock samples.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention provides a rock anisotropic tensile strength testing device and a use method thereof, wherein the rock anisotropic tensile strength testing device is arranged on a universal testing machine, the bottom of the universal testing machine is provided with a workbench, a cross beam of the universal testing machine is provided with a dowel bar, the workbench is provided with a pressure box, the pressure box is internally provided with an installation hole capable of transversely placing a rock sample, and the upper end and the lower end of the inner wall of the installation hole are provided with cutting edges for pressing the rock sample; the pressure box comprises an upper pressure block and a lower pressure block which are matched with each other and fixedly connected together through bolts; the bottom of the lower pressure block is fixed on the workbench, and the top of the upper pressure block is fixedly connected with the output end of the dowel bar; the workbench is further provided with an annular dial, and the axis of the annular dial is superposed with the axis of the rock sample placed in the pressure box.
Preferably, the pressure cell is a square box body, and grooves consistent with the surface curvature of the rock sample are formed in the upper pressure block and the lower pressure block.
Preferably, vaseline for reducing friction between the contact surface of the rock sample and the mounting hole is coated on the cutting edge.
Preferably, the scale range displayed on the annular scale is at least 0-180 °.
The invention also provides a using method of the rock anisotropic tensile strength testing device, which comprises the following steps:
s1, selecting a natural rock sample according to the experiment requirement, and marking the tendency of the rock sample under the actual engineering condition by adopting an X-Y coordinate system;
s2, placing the rock sample in a mounting hole in a pressure box, and controlling the distance between an upper pressure block and a lower pressure block by using a bolt to enable the mounting hole to be matched with the rock sample;
s3, rotating the rock sample to have the same tendency as the tendency marked in the step S1;
s4, screwing out the bolt after setting the angle, pressing the pressure box and the rock sample in the pressure box by using the force transmission rod, and starting a Brazilian splitting test by the loading control of a universal testing machine;
s5, the reference ring rotates the rock sample to a plurality of groups of different angles, and then the step S4 is repeated to research the anisotropic tensile strength of the natural rock sample.
Preferably, the rock sample is rotated at 0 °, 18 °, 36 °, 54 °, 72 °, 90 °, 108 °, 126 °, 154 ° and 172 ° in step S5 for multiple sets of experiments.
The invention has the beneficial effects that: according to the invention, the annular dial is arranged on the universal testing machine, Brazilian splitting loading of natural rock mass in different directions can be realized, and a rock mass anisotropic tensile strength test in actual engineering can be carried out, so that the mechanical property of rock tensile failure can be known, and a test foundation is provided for engineering construction and design.
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, 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 the drawings without creative efforts.
FIG. 1 is a rock anisotropic tensile strength testing device provided by an embodiment of the invention;
FIG. 2 is an angular distribution pattern on the annular dial provided by an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a pressure cell and a cutting edge according to an embodiment of the present invention.
Description of reference numerals:
1. a universal experiment machine; 2. a dowel bar; 3. an annular dial; 4. a pressure cell; 41. an upper pressure block; 42. a lower pressure block; 5. a rock sample; 6. a work table; 7. a bolt; 8. and (7) cutting edges.
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 by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 to 3, a rock anisotropic tensile strength testing device and a use method thereof are arranged on a universal tester 1, a workbench 6 is arranged at the bottom of the universal tester 1, a dowel bar 2 is arranged on a cross beam of the universal tester 1, a pressure cell 4 is arranged on the workbench 6, and a mounting hole capable of transversely placing a rock sample 5 is formed in the pressure cell 4; the pressure box is made of No. 45 steel, and the elastic modulus of the pressure box is 210 Gpa;
the pressure box 4 comprises an upper pressure block 41 and a lower pressure block 42 which are matched with each other and fixedly connected together through a bolt 7; the bottom of the lower pressure block 42 is fixed on the workbench 6, and the top of the upper pressure block 41 is fixedly connected with the output end of the dowel bar 2; and the workbench 6 is also provided with an annular dial 3, and the axis of the annular dial 3 is superposed with the axis of the rock sample 5 placed in the pressure box 4.
The pressure cell 4 is a square box, and grooves consistent with the surface curvature of the rock sample 5 are formed in the upper pressure block 41 and the lower pressure block 42.
The lower extreme is equipped with the blade 8 that is used for compressing tightly rock sample 5 on the inner wall of mounting hole in the pressure cell 4, realizes blade 8 and rock sample 5's seamless joint, realizes radial loading, prevents eccentric loading.
Vaseline for reducing friction force between the contact surface of the rock sample 5 and the mounting hole is coated on the cutting edge 8.
The scale range displayed on the annular scale disk 3 is at least 0-180 deg.
The invention also provides a using method of the rock anisotropic tensile strength testing device, which comprises the following steps:
s1, selecting a natural rock sample 5 according to experimental requirements, making the rock sample 5 into a cylindrical sample with the diameter of 50mm and the height of 25mm, polishing two ends of the cylindrical sample smoothly, reducing the end effect, and marking the tendency of the rock sample 5 under actual engineering conditions by adopting an X-Y coordinate system;
s2, placing the rock sample 5 in a mounting hole in the pressure box 4, corresponding to the upper cutting edge 8 and the lower cutting edge 8, and controlling the distance between the upper pressure block 41 and the lower pressure block 42 by using the bolt 7 to enable the mounting hole to be matched with the rock sample 5;
s3, rotating the rock sample 5 to make the inclination of the rock sample identical to the inclination marked in the step S1;
s4, screwing out the bolt 7 after setting the angle, pressing the pressure cell 4 and the rock sample 5 in the pressure cell by using the dowel bar 2, and starting a Brazilian splitting test by loading and controlling the universal testing machine 1;
s5, the reference ring is turned to the dial 3 to continue to rotate the rock sample 5 to 0 °, 18 °, 36 °, 54 °, 72 °, 90 °, 108 °, 126 °, 154 ° and 172 °, and then the step S4 is repeated to study the anisotropic tensile strength of the natural rock sample 5.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (6)
1. A rock anisotropy tensile strength testing device is arranged on a universal testing machine (1), the bottom of the universal testing machine (1) is provided with a workbench (6), a cross beam of the universal testing machine (1) is provided with a dowel bar (2), the rock anisotropy tensile strength testing device is characterized in that the workbench (6) is provided with a pressure box (4), a mounting hole capable of transversely placing a rock sample (5) is formed in the pressure box (4), and the upper end and the lower end of the inner wall of the mounting hole are provided with cutting edges (8) used for pressing the rock sample (5); the pressure box (4) comprises an upper pressure block (41) and a lower pressure block (42) which are matched with each other and fixedly connected together through a bolt (7); the bottom of the lower pressure block (42) is fixed on the workbench (6), and the top of the upper pressure block (41) is fixedly connected with the output end of the dowel bar (2); the working table (6) is further provided with an annular dial (3), and the axis of the annular dial (3) coincides with the axis of the rock test sample (5).
2. The device for testing the anisotropic tensile strength of the rock according to claim 1, wherein the pressure cell (4) is a square box, and grooves which are consistent with the surface curvature of the rock sample (5) are formed in the upper pressure block (41) and the lower pressure block (42).
3. The anisotropic tensile strength testing apparatus of claim 1, wherein said cutting edge (8) is coated with vaseline for reducing friction between the contact surface of the rock specimen (5) and the mounting hole.
4. A rock anisotropic tensile strength testing device according to claim 1, wherein the scale range displayed on the annular scale (3) is at least 0-180 °.
5. The use method of the rock anisotropic tensile strength testing device according to claim 1, characterized by comprising the following steps:
s1, selecting a natural rock sample (5) according to the experiment requirement, and marking the tendency of the rock sample (5) under the actual engineering condition by adopting an X-Y coordinate system;
s2, placing the rock sample (5) in a mounting hole in the pressure box (4), and controlling the distance between the upper pressure block (41) and the lower pressure block (42) by using a bolt (7) to enable the mounting hole to be matched with the rock sample (5);
s3, rotating the rock sample (5) to make the inclination of the rock sample identical to the inclination marked in the step S1;
s4, screwing out the bolt (7) after setting an angle, pressing the pressure box (4) and the rock sample (5) in the pressure box by using the dowel bar (2), and starting a Brazilian splitting test by loading control of the universal testing machine (1);
s5, the reference ring is used for the graduated disc (3) to rotate the rock sample (5) to one or more groups of different angles, and then the step S4 is repeated to research the anisotropic tensile strength of the natural rock sample (5).
6. The method for using the apparatus for testing anisotropic tensile strength of rock according to claim 5, wherein the rock specimen (5) is rotated at angles of 0 °, 18 °, 36 °, 54 °, 72 °, 90 °, 108 °, 126 °, 154 ° and 172 ° in step S5 to perform a plurality of experiments.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202111392957.1A CN114279830A (en) | 2021-11-23 | 2021-11-23 | Rock anisotropic tensile strength testing device and using method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111392957.1A CN114279830A (en) | 2021-11-23 | 2021-11-23 | Rock anisotropic tensile strength testing device and using method thereof |
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| CN114279830A true CN114279830A (en) | 2022-04-05 |
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| CN202111392957.1A Pending CN114279830A (en) | 2021-11-23 | 2021-11-23 | Rock anisotropic tensile strength testing device and using method thereof |
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Cited By (1)
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| CN115165565A (en) * | 2022-07-01 | 2022-10-11 | 中国地质科学院地质力学研究所 | Method for evaluating value range of tensile strength of rock by using rock core deformation method |
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