CN218212343U - Rock lever type single-shaft creep test device - Google Patents
Rock lever type single-shaft creep test device Download PDFInfo
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- CN218212343U CN218212343U CN202221247226.8U CN202221247226U CN218212343U CN 218212343 U CN218212343 U CN 218212343U CN 202221247226 U CN202221247226 U CN 202221247226U CN 218212343 U CN218212343 U CN 218212343U
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Abstract
The application provides a rock lever unipolar creep test device, include: a platform for placing creep test rock; the lever pressure piece is connected with the platform, and the axial load is transmitted to the rock through the lever pressure piece, so that the load is applied to the test piece through a manual loading mode according to the lever principle, electric drive is not needed, the external condition interference can be avoided to the maximum extent in the test process, the test operation procedure is greatly simplified, and the constancy of the load in a long test period is ensured. Therefore, the problems that the existing creep test instrument cannot meet the load requirement required by a rock creep test, the instrument loss is large, the cost is high, the test precision is low, the test data is unreliable and the like in the test process are solved.
Description
Technical Field
The application relates to the technical field of rock rheological tests, in particular to a rock lever type uniaxial creep test device.
Background
The rock rheological property refers to the property of the rock, such as strength and deformation, which slowly changes along with time under the action of force, and the analysis and judgment can be made aiming at the long-term stability problem of rock engineering by researching the rock rheological property. Creep refers to the phenomenon that deformation of rock increases along with time under the action of constant temperature and constant pressure, and is an expression form of rheology, and most of rheology mechanical tests are researched by adopting a creep mode of ensuring that an applied load is constant and researching the change rule of deformation along with time.
The geotechnical analog simulation test technology is a searching means which is convenient to operate, purposefully researches prototypes and develops geotechnical mechanical characteristics earlier, namely according to analog test analog principle, a certain analog material (single or mixed by multiple materials) is poured and manufactured into analog simulation in a laboratory, and mechanical phenomena and stress-strain change characteristics on prototypes are judged and analyzed through observing stress and strain on the simulation, so that more reasonable and scientific basis is provided for geotechnical engineering design and selection of construction schemes. From the past to the present, when the stress characteristics of complex rock masses in actual engineering are researched, the geotechnical similarity simulation technology shows that other research means have no alternative position, so that the superiority of the technology in the aspect of researching the geotechnical mechanics is embodied.
The rock-soil similarity simulation technology can not only research the stress characteristics of rock-soil bodies in actual stress states, but also obtain similar simulated limit loads and damage forms from similarity simulation tests. Meanwhile, the result of the similar mode simulation test can be compared with the result of the numerical simulation calculation, and the result given by the similar mode simulation test is more visual and vivid, so that the impression can be more profound, and the method can be widely applied to actual geotechnical engineering research. With the rapid increase of the number of actual geotechnical engineering problems and the complex properties of different rock mechanics, the analog simulation test is widely applied to rock engineering, and the important function of the analog simulation test is increasingly shown.
Rock creep tests are characterized by a pressurizing device that provides a constant pressure, usually several days continuously, and most of the current rock creep test devices are loaded by using a rigid hydraulic servo tester, and although these devices have excellent performance in load control and data acquisition, they have significant disadvantages: firstly, due to the non-uniformity of the rock, the test pressure needs to reach 50 tons to meet the rock test requirements of different strengths, while the existing instrument device can not meet the load requirement; secondly, the loss of the instrument is large in the test process, and the test cost is high; thirdly, the stability of the tension and pressure loaded by the servo system is not enough, so that the test precision is not enough. And the hydraulic servo loading mode of the mechanical test press presses pressurizes the test piece by using the electric oil pump, so that the press is difficult to be used for creep test, each stage of load is applied for several days to tens of days after the creep test is started, the hydraulic servo test machine and the oil pump cannot continuously work for a long time, and the oil pump cannot work stably under the condition of long-time loading, so that the pressure is not constant, and the test data is not reliable.
For other simple test devices, the loading principle mainly utilizes a pulley block or a jack for loading, the devices are convenient to move and low in manufacturing cost, but the effect that a hydraulic jack in the simple test device keeps stable load is not ideal, and an instrument made of the pulley block cannot provide large compression load, so that the device is mainly suitable for creep deformation of some soft rock and soil materials and needs to be solved urgently.
Disclosure of Invention
The application provides a rock lever unipolar creep test device to solve the unable rock creep test load requirement that reaches of current creep test instrument, and the instrument loss is big in the testing process, with high costs, and the test precision is lower, the unreliable scheduling problem of test data.
The application provides a rock lever-type unipolar creep test device, include: a platform for placing creep test rock; a lever press connected to the platform through which axial loads are transferred to the rock.
Optionally, in this application, the method further includes: and the displacement detection piece is connected with the platform and is used for detecting the axial strain of the rock after a load is applied in the creep test.
Optionally, in this application, the displacement detecting member includes: displacement meter outer tube and flexible interior pole, flexible interior pole sets up move inside the meter outer tube, and for move the meter outer tube and reciprocate, flexible interior pole with pressure disk transmission in the platform is connected, follows the pressure disk is together removed, through flexible interior pole with the change detection of the relative position of displacement meter outer tube the axial strain of rock.
Optionally, in this application, the method further includes: and the load detection piece is arranged at the bottom of the test cylinder in the platform and is used for detecting the load on the rock.
Optionally, in this application, the method further includes: and the data recording part is connected with the displacement detection part and the load detection part and records the load size and the axial strain of the rock.
Optionally, in this application, the platform includes: a test cylinder for placing the rock; the chassis is arranged below the test cylinder; and the pressure plate is arranged above the test cylinder.
Optionally, in the present application, the lever presser comprises: a weight tray for placing weights; one end of the weight rod is connected with the weight tray, and the other end of the weight rod is connected with the cantilever rod; the dowel bar is connected with the pressure plate and transmits load to the rock; a rotating shaft connected with the dowel bar, wherein the rotating shaft is adjusted to enable the load transferred by the dowel bar to be vertically applied to the rock; and the counterweight balancer is connected with the cantilever rod and is used for balancing load by adjusting a weight.
Optionally, in this application, the platform includes: at least one mast post, the at least one displacement detection member is disposed on the at least one mast post.
Optionally, in the present application, the test cylinder is an acrylic plate.
Optionally, in the present application, the lever pressing member includes: and the pressure regulating bolt is connected with the pressure plate and applies load to the rock.
Therefore, the application has the following beneficial effects:
the platform is used for placing creep test broken rocks, axial loads are transmitted to the rocks through the lever pressurizing piece, and the creep test is carried out, so that loads are applied to a test piece through a manual loading mode according to the lever principle, electric drive is not needed, external condition interference can be avoided to the greatest extent in the test process, the test operation is simplified, and the constancy of the loads in a long test period is guaranteed. Therefore, the problems that the existing creep test instrument cannot meet the load requirement required by a rock creep test, the instrument loss is large, the cost is high, the test precision is low, the test data is unreliable and the like in the test process are solved.
Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.
Drawings
The foregoing and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is an illustration of an example of a rock leverage uniaxial creep test apparatus according to an embodiment of the present application;
FIG. 2 is a schematic front structural view of a rock leverage uniaxial creep test apparatus provided by an embodiment of the present application;
FIG. 3 is a schematic side view of a rock leverage type uniaxial creep test apparatus according to an embodiment of the present application;
FIG. 4 is a schematic top view of a rock leverage uniaxial creep test apparatus provided by an embodiment of the present application;
fig. 5 is a schematic structural diagram of a triple rock leverage type uniaxial creep test device provided by an embodiment of the application.
Description of reference numerals: the device comprises a platform-100, a test cylinder-101, a chassis-102, a pressure plate-103, at least one upright post-104, a lever pressure piece-200, a weight plate-201, a weight rod-202, a cantilever rod-203, a force transmission rod-204, a rotating shaft-205, a counterweight balancer-206, a pressure regulating bolt-207, a displacement meter outer sleeve-301 and a telescopic inner rod-302.
Detailed Description
Reference will now be made in detail to the embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are illustrative and intended to explain the present application and should not be construed as limiting the present application.
The present application is based on the discovery and recognition of the following facts and problems:
the existing rock creep test device can know that: rock creep tests are characterized by a pressurizing device that provides a constant pressure that is sustained, typically for several days.
In the prior art, most rock creep test devices are loaded by using a rigid hydraulic servo test machine, and although the instrument devices have excellent performance in load control and data acquisition, the instrument devices also have obvious defects: firstly, due to the non-uniformity of the rock, the test pressure needs to reach 50 tons to meet the test requirements of the rock with different strengths, and the existing instrument device cannot meet the load requirement; secondly, the loss of the instrument is large in the test process, and the test cost is high; thirdly, the stability of the tension and pressure loaded by the servo system is not enough, so that the test precision is not enough. And the hydraulic servo loading mode of the mechanical test press presses uses the electric oil pump to pressurize the test piece, the press is difficult to be used for creep test, after the creep test starts, each stage of load is applied for several days to dozens of days, the hydraulic servo test machine and the oil pump can not work continuously for a long time, and the oil pump is unstable in work if loaded for a long time, so that the pressure is not constant, and the test data is unreliable.
For other simple rock creep test devices, the loading principle mainly adopts a pulley block or a jack for loading, the devices are convenient to move and low in manufacturing cost, but the effect of keeping the stable load of a hydraulic jack in the simple test device is not ideal, and an instrument made of the pulley block cannot provide a large compression load, so that the device is mainly only suitable for creep of some weak rock and soil materials.
The rock leverage type uniaxial creep test apparatus of the embodiment of the present application is described below with reference to the accompanying drawings. To the problem that mentions in the above-mentioned background art, this application provides a rock lever unipolar creep test device, and this application embodiment utilizes the platform to place the broken rock of creep test, transmits axial load to the rock through lever pressure member, carries out the creep test to according to lever principle, through manual loading mode to the test piece applied load, need not electric drive, can make the test process furthest avoid external condition to disturb, simplify test operation, guaranteed the invariant of experimental long period internal load. Therefore, the problems that the existing creep test instrument cannot meet the load requirement required by the rock creep test, the instrument loss is large, the cost is high, the test precision is low, the test data is unreliable and the like in the test process are solved.
Specifically, fig. 1 is a schematic structural diagram of a rock lever type uniaxial creep test device provided in an embodiment of the present application.
As shown in fig. 1, the rock leverage type uniaxial creep test apparatus 10 includes: a platform 100 and a lever press 200.
Wherein the platform 100 is used for placing creep test rock. The lever press 200 is connected to the platform 100 and axial loads are transmitted to the rock through the lever press 200 to complete the rock creep test.
It can be understood that rock creep simulation test is carried out through the rock lever type single-shaft creep test device 10 in a laboratory by adopting a rock-soil similar simulation test technology in the embodiment of the application, and the mechanical phenomenon and the stress-strain change characteristic generated in the test process are judged and analyzed, so that a more reasonable and scientific basis is provided for the design of geotechnical engineering and the selection of a construction scheme.
Optionally, in an embodiment of the present application, as shown in fig. 2, the platform 100 includes: a test cylinder 101 for placing rocks; a chassis 102 disposed below the test cylinder 101; and a platen 103 disposed above the test cylinder 101. In addition, the platform 100 includes at least one post 104.
The test cylinder 101 is a transparent acrylic member and is generally mounted on the chassis 102, and the acrylic test cylinder 101 is used for placing a rock sample, performing a creep test and being detachable according to actual requirements. The chassis 102 describes the sizes of two test pieces, namely, the creep test can be carried out on the test piece with the diameter of 50mm or 75 mm.
Alternatively, in one embodiment of the present application, as shown in fig. 2, the lever pressing member 200 includes: a weight tray 201 for placing weights; one end of the weight rod 202 is connected with the weight tray 201, and the other end of the weight rod 202 is connected with the cantilever rod 203; a dowel bar 204, wherein the dowel bar 204 is connected with the pressure plate 103 and is used for transferring load to the rock; a rotating shaft 205, the rotating shaft 205 is connected with the dowel 204, and the load transmitted by the dowel 204 is vertically applied to the rock by adjusting the rotating shaft 205; and a weight balancer 206, wherein the weight balancer 206 is connected with the cantilever rod 203, and the weight is adjusted to balance the load.
It can be understood that, in the embodiment of the present application, by adding weights in the weight tray 201, the axial load is applied to the test piece of the creep test, and the rotating shaft 205 is connected to the force transfer rod 204, so that the load applied to the test piece can be vertically applied, the load is stably loaded, the load vibration is prevented, the load is constant in a long period of the test, and the external condition interference is avoided to the maximum extent in the test process. The counterweight balancer 206 can balance the load by adjusting the position of the weight, thereby ensuring the long-term stability of the rock creep test.
Further, the lever pressing member 200 includes: and the pressure regulating bolt 207 is connected with the dowel bar 204, so that when the load applied by the weight to the test piece is insufficient, the load can be increased through the pressure regulating bolt 207, and the pressure can be continuously increased, so that the load requirement of the creep test can be met.
The structure of the rock leverage type uniaxial creep test device of the embodiment of the application can be clearly seen by combining the structure shown in fig. 3, 4 and 5.
Optionally, in an embodiment of the present application, the rock leverage uniaxial creep test apparatus 10 further includes: and at least one displacement detecting member connected to the platform 100 to detect axial strain of the rock after the load is applied in the creep test.
Wherein, displacement detection spare includes: the displacement meter comprises a displacement meter outer sleeve 301 and an inner telescopic rod 302, wherein the inner telescopic rod 302 is arranged inside the displacement meter outer sleeve 301 and moves up and down relative to the displacement meter outer sleeve 301, the inner telescopic rod 302 is in transmission connection with a pressure plate 103 in the platform 100 and moves along with the pressure plate 103, and the axial strain of the rock is detected through the change of the relative positions of the inner telescopic rod 302 and the displacement meter outer sleeve 301.
The telescopic inner rod 302 is arranged in the displacement meter outer sleeve 301 in a manner of moving up and down relative to the displacement meter outer sleeve 301, a displacement meter mounting plate is arranged on the upright post 104, the displacement detection piece outer sleeve 301 is mounted on the upright post 104 through the displacement meter mounting plate, the telescopic inner rod 302 is in transmission connection with the pressure plate 103 so as to move together with the pressure plate 103, and the displacement detection piece 300 detects the displacement of the pressure plate 103 according to the relative positions of the telescopic inner rod 302 and the displacement meter outer sleeve 301.
Optionally, in an embodiment of the present application, the method further includes: and the load detection piece is arranged at the bottom of the test cylinder 101 in the platform and is used for detecting the load on the rock.
In addition, in an embodiment of the present application, the method further includes: and the data recording part is connected with the displacement detection part and the load detection part so as to record the data change detected by the displacement detection part and the load detection part and record the load size and the axial strain of the rock.
In embodiments of the present application, the rock leverage uniaxial creep test apparatus may be a triple creep apparatus, as shown in fig. 5, and the three instruments described above may be separately controlled.
In the process of carrying out the simulation test through the rock sample creep test device, the method mainly comprises two processes of loading and pressure stabilization, wherein a load value with a designed size is applied to a test piece, then the load value is kept unchanged by adopting a certain method, and the change of the deformation of the test piece along with time is measured in the process; and applying the next-stage load until the deformation of the test piece hardly changes along with the time, keeping the load stable, and measuring the change of the deformation of the test piece along with the time. This is repeated until the specimen develops accelerated creep until failure.
The application method of the rock lever type single-shaft creep test device comprises the following steps:
the displacement detection piece is arranged between the chassis and the pressure plate, the displacement detection piece comprises a displacement meter outer sleeve and an inner telescopic rod, the inner telescopic rod is arranged in the displacement meter outer sleeve in a mode of moving up and down relative to the displacement meter outer sleeve, the displacement meter outer sleeve is arranged on the vertical rod column, and the displacement detection piece detects the displacement of the test piece according to the relative position of the inner telescopic rod and the displacement meter outer sleeve.
The load detection piece is arranged at the bottom, and the load detection piece is suitable for placing a sample to be detected and detecting the received load. The weight with enough weight is placed on the weight tray, the rear counterweight balancer is rotated, the load on the test piece can be vertically applied, the loading is stable, the load vibration is prevented, the constant load in a long period of the test is ensured, and the interference of external conditions in the test process is avoided to the maximum extent.
After the load is applied, the data recorder is respectively and electrically connected with the displacement detection piece and the load detection piece so as to record the change of detection data of the displacement detection piece and the load detection piece.
According to the rock lever type single-shaft creep test device provided by the embodiment of the application, the platform is used for placing the creep test to break the rock, the axial load is transmitted to the rock through the lever pressurizing piece, the creep test is carried out, so that the load is applied to the test piece through a manual loading mode according to the lever principle, and the constancy of the load in the test long period is ensured. In addition, this creep test device need not electric drive, can make the test process furthest avoid external conditions to disturb, simplifies test operation for this rock lever unipolar creep test device has not only guaranteed that pressure is exerted perpendicularly and the stability of pressure loading lever, can also prevent load vibration.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or N embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "N" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
Claims (8)
1. A rock lever type uniaxial creep test device is characterized by comprising:
a platform for placing creep test rock;
a lever press connected to the platform through which axial loads are transferred to the rock;
the platform includes: a test cylinder for placing the rock; the chassis is arranged below the test cylinder; the pressure plate is arranged above the test cylinder;
the lever pressing member includes: a weight tray for placing weights; one end of the weight rod is connected with the weight tray, and the other end of the weight rod is connected with the cantilever rod; a dowel bar connected to the pressure plate to transfer load to the rock;
a rotating shaft connected with the dowel bar, wherein the rotating shaft is adjusted to enable the load transferred by the dowel bar to be vertically applied to the rock; and the counterweight balancer is connected with the cantilever rod and is used for balancing load by adjusting weights.
2. The apparatus of claim 1, further comprising:
and the displacement detection piece is connected with the platform and is used for detecting the axial strain of the rock after a load is applied in the creep test.
3. The apparatus of claim 2, wherein the displacement sensing member comprises:
displacement meter outer tube and flexible interior pole, flexible interior pole sets up inside the displacement meter outer tube, and for move the meter outer tube and reciprocate, flexible interior pole with pressure disk transmission in the platform is connected, follows the pressure disk is together removed, through flexible interior pole with the change detection of the relative position of displacement meter outer tube the axial strain of rock.
4. The apparatus of claim 2, further comprising:
and the load detection piece is arranged at the bottom of the test cylinder in the platform and is used for detecting the load on the rock.
5. The apparatus of claim 4, further comprising:
and the data recording part is connected with the displacement detection part and the load detection part and records the load size and the axial strain of the rock.
6. The apparatus of claim 2, wherein the platform comprises:
at least one post, the at least one displacement detection member is disposed on the at least one post.
7. The apparatus of claim 1,
the test cylinder is an acrylic plate.
8. The device of claim 1, wherein the lever press comprises:
and the pressure regulating bolt is connected with the pressure plate and applies load to the rock.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221247226.8U CN218212343U (en) | 2022-05-20 | 2022-05-20 | Rock lever type single-shaft creep test device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221247226.8U CN218212343U (en) | 2022-05-20 | 2022-05-20 | Rock lever type single-shaft creep test device |
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| CN218212343U true CN218212343U (en) | 2023-01-03 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117288563A (en) * | 2023-09-27 | 2023-12-26 | 中国科学院武汉岩土力学研究所 | Ultralow frequency cyclic load creep test system and test method |
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2022
- 2022-05-20 CN CN202221247226.8U patent/CN218212343U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117288563A (en) * | 2023-09-27 | 2023-12-26 | 中国科学院武汉岩土力学研究所 | Ultralow frequency cyclic load creep test system and test method |
| CN117288563B (en) * | 2023-09-27 | 2024-04-30 | 中国科学院武汉岩土力学研究所 | Ultralow frequency cyclic load creep test system and test method |
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