CN113776961A - Temperature and pressure synchronous loading device and method suitable for rock dynamics test - Google Patents
Temperature and pressure synchronous loading device and method suitable for rock dynamics test Download PDFInfo
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Abstract
The invention discloses a temperature and pressure synchronous loading device suitable for a rock dynamics test, which comprises a high-temperature and high-pressure loading unit, a temperature and pressure synchronous conduction unit and an SHPB dynamic loading unit; the temperature and pressure synchronous loading method suitable for the rock dynamics test comprises the following steps: step 1, installing a high-temperature high-pressure loading unit; step 2, installing a temperature and pressure synchronous conduction unit; step 3, mounting a rock sample; step 4, setting test parameters; step 5, performing an SHPB impact test; step 6, repeating the test; the invention provides a high-temperature high-pressure synchronous loading device and method which are simple, convenient and efficient to operate, highly modularized and reliable in performance and are suitable for a rock Hopkinson pressure bar test.
Description
Technical Field
The invention belongs to the technical field of high-temperature rock triaxial dynamic tests, and particularly relates to a temperature and pressure synchronous loading device and method suitable for a rock dynamic test.
Background
With the rapid development of engineering construction in the fields of water conservancy, geotechnical engineering and the like, many researches are beginning to focus on deep rocks in the stratum. The complex existing environment in deep underground causes the rock to be in a high temperature and high pressure state. Dynamic loads with high strain rates such as engineering blasting and earthquakes cause the rock material to be often disturbed by impact loads, and have great influence on engineering safety and construction efficiency, so that the mechanical properties and the deformation failure mechanism of the rock material under the dynamic loads in a high-temperature and high-pressure environment need to be researched urgently.
At present, the separated Hopkinson pressure bar is widely applied to research and test of rock dynamic characteristics, but the traditional separated Hopkinson pressure bar can only be used for testing the dynamic characteristics of materials in a one-dimensional stress state, and cannot simulate the high-temperature and high-pressure environment state in a deep stratum, so that the development of a high-temperature and high-pressure synchronous loading device and method suitable for the rock Hopkinson pressure bar test is urgently needed.
Some existing hopkinson pressure lever devices, such as CN110296898A and CN208223987U, can simulate a high-temperature environment through a thermal radiation type heating device, but the thermal radiation efficiency is limited, the temperature cannot be raised rapidly, and confining pressure cannot be applied to a sample. Patent CN201110200000.2 discloses a by hydro-cylinder driven hopkinson confining pressure device, and CN203616199U is then the hopkinson depression bar confining pressure device that lets in gas or liquid between flexible inner and outer wall, and above-mentioned two kinds of devices homoenergetic applys stable even confining pressure to the sample, but is not suitable for the high temperature heating environment, can't realize the high-pressure synchronous loading of high temperature. Patent CN110926927A discloses a flip type hopkinson rod confining pressure device, which utilizes a flip type design to simplify the test operation and improve the test efficiency while applying confining pressure to the sample, but still cannot simulate the high temperature environment of the deep rock stratum. The patent CN110987667A is a rock high-temperature shear test device suitable for a split Hopkinson bar, the device realizes high-temperature and high-pressure synchronous loading through a high-temperature confining pressure loading unit and an SHPB dynamic loading unit, but the device mainly aims at an impact shear test; the high-temperature confining pressure loading unit is an integral structure sample, and the installation and disassembly processes are complex; in addition, the rock sample can expand and deform under the action of dynamic load, and the acting force generated after the sample expands is transmitted to the servo press machine through the connecting pipe, so that the confining pressure is fluctuated, and the constancy of the confining pressure in the experimental process can not be ensured.
In summary, in order to study the dynamic characteristics of the rock material under high temperature and high pressure, the above-mentioned defects must be overcome, and a new hopkinson pressure bar test device is developed.
Disclosure of Invention
The invention aims to provide a high-temperature high-pressure synchronous loading device and method which are simple, convenient and efficient to operate, highly modularized and reliable in performance and are suitable for a rock Hopkinson pressure bar test, aiming at the defects of the prior art.
In order to solve the technical problems, the invention adopts the following technical scheme:
the temperature and pressure synchronous loading device suitable for the rock dynamics test comprises a high-temperature high-pressure loading unit, a temperature and pressure synchronous conduction unit and an SHPB dynamic loading unit;
the high-temperature and high-pressure loading unit comprises a high-temperature loading module and a confining pressure loading module, the high-temperature loading module comprises an upper rigid heat-insulating cover and a lower rigid heat-insulating cover, heating elements are nested in the upper rigid heat-insulating cover and the lower rigid heat-insulating cover, and the confining pressure loading module comprises a rigid frame, an oil cylinder servo and an external spring connecting rod; the temperature and pressure synchronous conduction unit comprises
The device comprises an internal spring connecting rod, a metal pressure transmission plate, a silicon carbide metal mesh bag and a rock sample from outside to inside in sequence; and an incident rod and a transmission rod of the SHPB dynamic loading unit are respectively aligned to two opposite ends of the rock sample.
Furthermore, the upper rigid heat-insulating cover and the lower rigid heat-insulating cover are two hollow semi-circular ring bodies which are symmetrically arranged, the two semi-circular ring bodies are folded to form a hollow cylinder, the upper rigid heat-insulating cover and the lower rigid heat-insulating cover are connected by a hinge, the edge of the other side of the hinge connection edge which is symmetrical is provided with a connection outer edge, and a fastening bolt is arranged on the connection outer edge to realize the detachable flip type connection of the rigid heat-insulating cover;
furthermore, the silicon carbide metal mesh bag is four symmetrically arranged quarter ring bodies, two by two groups of the four quarter ring bodies form two hollow half ring bodies which are respectively and correspondingly arranged on the inner sides of the upper and lower rigid heat preservation covers, the four ring bodies are folded to form a cylinder with a circle center channel in the axial lead direction, and the circular channel is used as a sample chamber for installing a rock sample;
furthermore, the metal pressure transmission plate is composed of four metal plates which are symmetrically arranged and the surfaces of which are arc surfaces, the metal plates correspond to the four silicon carbide metal mesh bags respectively and are nested on the arc surfaces on the outer sides of the silicon carbide metal mesh bags, so that the pressure generated by the oil cylinder servo is uniformly transmitted to the silicon carbide metal mesh bags, and the internal spring connecting rod is fixedly connected to the central position on the outer side of the metal pressure transmission plate;
furthermore, four oil cylinder servo machines are respectively corresponding to the silicon carbide metal mesh bags, are uniformly distributed and symmetrically fixed on the rigid frame along the circumferential direction of the rock sample, and the piston rod ends of the oil cylinder servo machines are fixedly connected with an external spring connecting rod;
furthermore, the tail end of the external spring connecting rod is provided with a connector, so that the connection and the disassembly of the internal spring connecting rod can be realized;
furthermore, holes are formed in the side parts of the upper rigid heat-insulating cover and the lower rigid heat-insulating cover for the internal spring connecting rod to pass through, and openings at the two ends are used for the injection rod and the transmission rod to pass through;
further, an oil inlet hole and an exhaust hole are formed in the oil cylinder servo;
further, the metal mesh bag with the aperture of 1mm is arranged outside the silicon carbide metal mesh bag, and silicon carbide particles with the particle size of 2-3mm are filled inside the silicon carbide metal mesh bag;
furthermore, the heating element is a metal resistance heating ring and is provided with a temperature control element, and the temperature can be automatically adjusted by a computer to keep the temperature constant at a target value;
furthermore, the incident rod and the transmission rod are both of solid rod body structures, and the diameters of the incident rod and the transmission rod are equal;
further, the rock sample is a cylinder;
the temperature and pressure synchronous loading method suitable for the rock dynamics test uses the test device and comprises the following steps:
firstly, mounting a heating element in a rigid heat-insulating cover, and connecting an upper rigid heat-insulating cover and a lower rigid heat-insulating cover by hinges; secondly, installing an oil cylinder servo on the rigid frame;
firstly, mounting a silicon carbide metal mesh bag on the inner side of a metal pressure transmission plate; secondly, inserting an internal spring connecting rod into a hole reserved on the side part of the rigid heat-insulating cover; then, after the rigid heat-insulating cover is closed and locked through a hinge and a fastening bolt, an external spring connecting rod of the oil cylinder servo machine is connected with an internal connecting rod;
firstly, mounting a rock sample in a cavity area formed by a silicon carbide metal mesh bag; secondly, starting an oil cylinder servo, and aligning the center of the sample with the centers of the incident rod and the transmission rod respectively by adjusting the pressure of the oil cylinder servo; then adjusting the incident rod and the transmission rod to be in contact with the sample;
firstly, setting the pressure of the oil cylinder servo machine as a target pressure, and pressurizing each oil cylinder servo machine to the target value; secondly, after the confining pressure is constant, heating the rock sample to a target temperature through a heating element;
firstly, adjusting a trigger device and a data collection device of an SHPB dynamic loading unit; secondly, performing a three-dimensional SHPB impact test and recording data;
firstly, unloading confining pressure after the impact test is finished, and waiting for cooling; secondly, opening the fastening bolt, removing the connection between the two outer and inner spring connecting rods of the upper rigid heat-insulation cover, and opening the upper rigid heat-insulation cover; and then taking out the rock sample, putting the rock sample into a new sample, closing the upper rigid heat-insulation cover, connecting the inner spring connecting rod and the outer spring connecting rod, and locking the fastening bolt to repeat the steps 4-6.
Compared with the prior art, the invention has the following beneficial effects:
1. the silicon carbide (SiC) has the characteristics of high temperature resistance, high pressure resistance and high thermal conductivity, and the silicon carbide metal mesh bag is used as a conduction medium, so that the high-temperature and high-pressure synchronous conduction can be effectively realized; meanwhile, silicon carbide particles are mutually extruded in the loading process to form a self-locking effect, so that enough friction force is provided for the side face of the sample, and the stability of the sample position in the test process is ensured.
2. The rigid heat-insulating cover adopts a flip design, and is structurally independent but functionally combined; the upper rigid heat-insulating cover and the lower rigid heat-insulating cover are opened and closed through the hinge and the fastening bolt, and the position of the sample can not be changed after the initial adjustment is finished due to the design of the flip cover, so that the installation and the disassembly of the sample are greatly simplified, and the test efficiency is improved.
3. In the device, the oil cylinder servo-machine transmits the pressure to the metal transmission pressing plate through the external spring connecting rod and the internal spring connecting rod, and then the pressure is uniformly transmitted to the annular direction of the sample through the silicon carbide metal net. The spring connecting rod plays a role in buffering, and can effectively avoid the influence of acting force generated by expansion deformation of the sample under dynamic load on the oil cylinder servo machine, so that the constant of confining pressure in the test process is ensured by avoiding the pressure fluctuation of the confining pressure. Meanwhile, the connecting rod separated design can be matched with a flip structure of the rigid heat-insulating cover, so that the device dismounting process is simplified, and the test efficiency is improved.
4. The device has simple structure, clear partitions and high modularization degree; the modular design of the high-temperature and high-pressure loading unit ensures that the temperature loading and the confining pressure loading are independent and do not interfere with each other, and the temperature and pressure synchronous conduction unit can realize the combined action of the temperature confining pressure on the sample; the modularized design makes the equipment convenient to disassemble, assemble and maintain, and improves the working reliability.
Drawings
FIG. 1 is a front view of the device of the invention;
FIG. 2 is a front view of the device of the invention with the major components separated;
FIG. 3 is a top view of the apparatus of the present invention;
wherein: 1-upper rigid heat preservation cover, 2-lower rigid heat preservation cover, 3-heating element, 4-metal pressure transmission plate, 5-silicon carbide metal mesh bag, 6-rock sample, 7-external spring connecting rod, 8-internal spring connecting rod, 9-oil cylinder servo, 10-oil inlet hole, 11-exhaust hole, 12-incident rod, 13-transmission rod, 14-hinge, 15-fastening bolt and 16-rigid frame.
Detailed Description
The following detailed description of embodiments of the invention is provided in connection with the accompanying drawings. The following examples or figures are illustrative of the present invention and are not intended to limit the scope of the present invention.
Referring to fig. 1-3, the temperature and pressure synchronous loading device suitable for the rock dynamics test comprises a high-temperature and high-pressure loading unit, a temperature and pressure synchronous conduction unit and an SHPB dynamic loading unit. The high-temperature high-pressure loading unit consists of a high-temperature loading module and a confining pressure loading module, the high-temperature loading module comprises an upper rigid heat-insulating cover 1, a lower rigid heat-insulating cover 2 and a heating element 3, and the confining pressure loading module comprises a rigid frame 16, an oil cylinder servo 9 and an external spring connecting rod 7; the temperature and pressure synchronous conduction unit comprises an internal spring connecting rod 8, a metal transmission pressing plate 4, a silicon carbide metal mesh bag 5 and a rock sample 6; the SHPB dynamic loading unit is a conventional SHPB test system mainly comprising an incident rod 12 and a transmission rod 13.
Referring to fig. 3, the upper rigid heat-insulating cover 1 and the lower rigid heat-insulating cover 2 are two hollow semi-circular ring bodies which are symmetrically arranged, the two semi-circular ring bodies are folded to form a hollow cylinder, the upper rigid heat-insulating cover and the lower rigid heat-insulating cover are connected by a hinge 14, the other side edge of the connection edge of the hinge 14, which is symmetrical, is provided with a connection outer edge, a fastening bolt 15 is arranged on the connection outer edge to realize the opening and closing of a flip cover between the two semi-circular ring column rigid heat-insulating covers, the inner side of the rigid heat-insulating cover is nested with a heating element 3, and the heating element 3 and the upper rigid heat-insulating cover and the lower rigid heat-insulating cover form a high-temperature loading module; the inner side of the high-temperature loading module is a temperature and pressure synchronous conduction unit taking a silicon carbide metal mesh bag 5 as a main component, the silicon carbide metal mesh bag 5 is four symmetrically arranged quarter ring bodies, two by two groups of the quarter ring bodies form two hollow semi-ring bodies which are respectively and correspondingly nested on the inner sides of the upper rigid heat-insulating cover and the lower rigid heat-insulating cover, the four ring bodies form a cylinder with a circle center channel in the axial lead direction after being folded, and the circular channel is used as a sample chamber for mounting a rock sample 6. The metal pressure transmission plate 4 is four metal plates which are symmetrically arranged and have arc surfaces on the surfaces, corresponds to the four silicon carbide metal mesh bags 5 respectively, and is nested on the arc surfaces on the outer sides of the silicon carbide metal mesh bags 5, so that the pressure generated by the oil cylinder servo 9 is uniformly transmitted to the silicon carbide metal mesh bags 5, and the inner spring connecting rod 8 is fixedly connected to the center of the outer side of the metal pressure transmission plate 4.
In the embodiment, four oil cylinder servo machines 9 respectively correspond to the four silicon carbide metal mesh bags 5, and are uniformly distributed and symmetrically fixed on a rigid frame 16 along the circumferential direction of a rock sample 6, and the piston rod ends of the oil cylinder servo machines 9 are fixedly connected with an external spring connecting rod 7; and inside spring coupling pole 8 and outside spring coupling pole 7 can be connected through the connector of the terminal setting of outside spring coupling pole 7 and form a whole for the pressure that oil cylinder servo 9 produced can be transmitted for metal by outside, inside spring coupling pole and pass clamp plate 4, and metal passes clamp plate 4 and transmits pressure for carborundum metal mesh bag 5 and then forms the confined pressure with the even hoop of applying of pressure at rock sample 6 again.
Specifically, the upper part of the oil cylinder servo 9 is provided with an oil inlet 10 so that hydraulic oil can smoothly enter the oil cylinder, and the lower part of the oil cylinder servo is provided with an exhaust hole 11 so as to discharge air in the oil cylinder to ensure that the piston moves smoothly.
In the embodiment, the upper and lower rigid heat-insulating covers are made of rigid heat-insulating materials, and the side part of the rigid heat-insulating cover corresponding to the spring connecting rod is provided with a hole for the inner spring connecting rod 8 to pass through; the two ends of the rigid heat-insulating cover are opened for the incident rod 12 and the transmission rod 13 to pass through. In practical application, the metal mesh bag with the aperture of 1mm is adopted outside the silicon carbide metal mesh bag 5, and the metal material is generally flexible metal material; the inside is filled with silicon carbide particles with the diameter of about 2-3 mm. According to the actual conditions, silicon carbide particles with other particle sizes and metal mesh bags with different pore diameters can also be adopted, but the diameter of the silicon carbide particles is not more than 5mm, and the pore diameter of the metal mesh bag is not more than the particle diameter of the silicon carbide.
In this example, the heating element 3 adopts a metal resistance heating ring, a temperature control element is arranged in the heating element 3, and the temperature can be automatically adjusted by a computer to keep the temperature constant at a target value; the oil cylinder servo 9 can control the pressure by a computer and maintain the surrounding pressure at a constant value, and the rock sample 6 is cylindrical.
The invention also provides a temperature and pressure synchronous loading method suitable for the rock dynamics test, which comprises the following steps:
firstly, mounting a metal resistance type heating ring 3 on the inner sides of an upper rigid heat-insulating cover 1 and a lower rigid heat-insulating cover 2, and connecting the upper rigid heat-insulating cover and the lower rigid heat-insulating cover by a hinge 14 to form an openable flip structure; secondly, an oil cylinder servo 9 is arranged on the rigid frame 16;
firstly, filling silicon carbide particles with the particle size of 2-3mm in a metal mesh bag with the aperture of 1mm, and installing a silicon carbide metal mesh bag 5 on the inner side of a metal pressure transmission plate 4; secondly, inserting the internal spring connecting rod 8 into a hole reserved on the side part of the rigid heat-insulating cover; then, after the upper rigid heat-insulation cover and the lower rigid heat-insulation cover are closed and locked through the hinge 14 and the fastening bolt 15, the external spring connecting rod 7 and the internal spring connecting rod 8 of the oil cylinder servo 9 are connected through a connector;
firstly, mounting a rock sample 6 in a cavity area formed by a silicon carbide metal mesh bag 5; secondly, starting the oil cylinder servo 9, and aligning the center of the rock sample 6 with the centers of the incident rod 12 and the transmission rod 13 respectively by adjusting the pressure of the oil cylinder servo 9; then the incident rod 12 and the transmission rod 13 are adjusted to be in contact with the sample;
firstly, setting the pressure of the oil cylinder servo 9 in a computer as a target pressure, and keeping the pressure constant when the oil cylinder servo 9 starts to pressurize to reach the target pressure; secondly, setting a target temperature by a computer, and applying voltage to the metal resistance type heating ring 3 to increase the temperature until the rock sample 6 is heated to the target temperature and is kept constant;
firstly, adjusting a trigger device and a data collection device of a conventional Hopkinson pressure bar test system; secondly, performing a three-dimensional SHPB impact test, applying stress waves to the incident rod 12 through a trigger device, monitoring the strain changes of the incident rod 12 and the transmission rod 13, and recording data;
firstly, unloading confining pressure after an impact test is finished, and waiting for the temperature to be reduced to a safe value; secondly, opening the fastening bolt 15, releasing the connection between the two inner spring connecting rods 8 and the outer spring connecting rods 7 corresponding to the upper rigid heat-insulating cover 1, and opening the upper rigid heat-insulating cover 1; and then taking out the rock sample 6, putting the rock sample into a new sample, closing the upper rigid heat-insulation cover, connecting the inner spring connecting rod and the outer spring connecting rod, locking the fastening bolt 15, and repeating the steps 4 to 6.
The working principle of the high-temperature high-pressure synchronous loading device suitable for the rock Hopkinson pressure bar test provided by the invention is as follows: the method is characterized in that an upper rigid heat-insulation cover 1, a lower rigid heat-insulation cover 2, a metal resistance type heating ring 3, a metal pressure transmission plate 4, a silicon carbide metal mesh bag 5, a rock sample 6, an external spring connecting rod 7, an internal spring connecting rod 8 and an oil cylinder servo 9 are installed according to the mode shown in the figures 1 and 3, the oil cylinder servo in four directions generates pressure, the pressure is transmitted to the silicon carbide metal mesh bag through the connecting rods and the metal pressure transmission plate, meanwhile, the metal resistance type heating ring works to increase the temperature, and the temperature is transmitted to the silicon carbide metal mesh bag; the silicon carbide metal mesh bag synchronously conducts the temperature and the pressure to the arc-shaped surface of the sample, so that the high-temperature and high-pressure environment simulation around the rock sample is realized. Meanwhile, the hinge 14 and the fastening bolt 15 are installed according to the mode shown in figure 3, the whole sample chamber is divided into two semicircular rings, the flip type opening and closing of the rigid heat-insulation cover is realized, the efficiency in the test process is improved, and the installation and disassembly processes of the sample are simplified. In addition, the outer spring connecting rod 7 and the inner spring connecting rod 8 are designed into a separated spring structure; the device can be connected to form a whole during test, acting force can be generated on the annular silicon carbide metal mesh bag after the sample is expanded and deformed, the acting force is transmitted to the inner spring connecting rod and the outer spring connecting rod through the silicon carbide metal mesh bag by the metal pressure transmitting plate, the spring is deformed to absorb the acting force, so that the acting force is prevented from being transmitted to the oil cylinder servo machine, the fluctuation of confining pressure is reduced, and the constancy of the confining pressure is ensured; after the test is finished, the test board is disassembled into two parts, the oil cylinder servo and the temperature and pressure synchronous conduction unit are quickly disassembled and assembled through the separated design, and the test efficiency is improved through the matching of the flip cover design.
The above examples are merely illustrative for clearly illustrating the present invention and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And need not be exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the scope of the invention.
Claims (10)
1. The temperature and pressure synchronous loading device suitable for the rock dynamics test is characterized by comprising a high-temperature high-pressure loading unit, a temperature and pressure synchronous conduction unit and an SHPB dynamic loading unit;
the high-temperature and high-pressure loading unit comprises a high-temperature loading module and a confining pressure loading module, the high-temperature loading module comprises an upper rigid heat-insulation cover (1) and a lower rigid heat-insulation cover (2), a heating element (3) is embedded in the upper rigid heat-insulation cover, and the confining pressure loading module comprises a rigid frame (16), an oil cylinder servo (9) and an external spring connecting rod (7); the warm-pressing synchronous conduction unit comprises an internal spring connecting rod (8), a metal transmission pressing plate (4), a silicon carbide metal mesh bag (5) and a rock sample (6) from outside to inside in sequence; and an incident rod (12) and a transmission rod (13) of the SHPB dynamic loading unit are respectively aligned to two opposite ends of the rock sample (6).
2. The warm-pressing synchronous loading device suitable for the rock dynamics test is characterized in that the upper rigid heat-insulating cover (1) and the lower rigid heat-insulating cover (2) are two hollow semi-circular ring bodies which are symmetrically arranged, the two semi-circular ring bodies are folded to form a hollow cylinder, the upper rigid heat-insulating cover (1) and the lower rigid heat-insulating cover (2) are connected through a hinge (14), the other side edge of the hinge connecting edge which is symmetrical is provided with a connecting outer edge, and the connecting outer edge is provided with a fastening bolt to realize the detachable flip type connection of the rigid heat-insulating covers.
3. The warm-pressing synchronous loading device suitable for the rock dynamics test according to claim 1, wherein the silicon carbide metal mesh bag (5) is four symmetrically arranged quarter-ring bodies, two by two groups of the quarter-ring bodies form two hollow half-ring bodies, the two hollow half-ring bodies are respectively and correspondingly installed on the inner sides of the upper rigid heat preservation cover and the lower rigid heat preservation cover, the four ring bodies are folded to form a cylinder with a center channel in the axial direction, and the circular channel is used as a sample chamber for installing a rock sample.
4. The warm-pressing synchronous loading device suitable for the rock dynamics test according to claim 1, wherein the metal pressure transmission plate (4) is four metal plates with arc surfaces on the surfaces, which are symmetrically arranged, and the metal plates are respectively corresponding to the four silicon carbide metal mesh bags (5) and are nested on the arc surfaces on the outer sides of the silicon carbide metal mesh bags (5), so that the pressure generated by the oil cylinder servo is uniformly transmitted to the silicon carbide metal mesh bags (5), and the internal spring connecting rod (8) is fixedly connected to the central position on the outer sides of the metal pressure transmission plate (4).
5. The warm-pressing synchronous loading device suitable for the rock dynamics test of claim 1, wherein the oil cylinder servo-machines (9) are four in number, correspond to the silicon carbide metal mesh bags (5), are uniformly distributed and symmetrically fixed on a rigid frame along the circumferential direction of a rock sample, and the piston rod ends of the oil cylinder servo-machines (9) are fixedly connected with an external spring connecting rod (7).
6. The warm-pressing synchronous loading device suitable for the rock dynamics test is characterized in that the tail end of the outer spring connecting rod (7) is provided with a connector, so that the connection and the detachment of the inner spring connecting rod can be realized.
7. The temperature and pressure synchronous loading device suitable for the rock dynamics test is characterized in that the side parts of the upper rigid heat-insulating cover (1) and the lower rigid heat-insulating cover (2) are provided with holes for the internal spring connecting rod to pass through, and the two ends of the upper rigid heat-insulating cover and the lower rigid heat-insulating cover are provided with openings for the incident rod and the transmission rod to pass through; and an oil inlet hole and an exhaust hole are formed in the oil cylinder servo machine (9).
8. The warm-pressing synchronous loading device suitable for the rock dynamics test is characterized in that the silicon carbide metal mesh bag (5) is externally provided with a metal mesh bag with a hole diameter of 1mm, and internally filled with silicon carbide particles with a particle size of 2-3 mm;
9. the temperature and pressure synchronous loading device suitable for the rock dynamics test is characterized in that the heating element (3) is a metal resistance heating ring and is provided with a temperature control element, and the temperature can be automatically adjusted by a computer to keep the temperature constant at a target value; the incident rod (12) and the transmission rod (13) are both of solid rod body structures, and the incident rod (12) and the transmission rod (13) are equal in diameter; the rock sample (6) is a cylinder.
10. The temperature and pressure synchronous loading method suitable for the rock dynamics test is characterized in that the temperature and pressure synchronous loading device suitable for the rock dynamics test, which is disclosed by claims 1 to 9, is used, and comprises the following steps:
step 1, installing a high-temperature high-pressure loading unit:
firstly, mounting a heating element in a rigid heat-insulating cover, and connecting an upper rigid heat-insulating cover and a lower rigid heat-insulating cover by hinges; secondly, installing an oil cylinder servo on the rigid frame;
step 2, installing a temperature and pressure synchronous conduction unit:
firstly, mounting a silicon carbide metal mesh bag on the inner side of a metal pressure transmission plate; secondly, inserting an internal spring connecting rod into a hole reserved on the side part of the rigid heat-insulating cover; then, after the rigid heat-insulating cover is closed and locked through a hinge and a fastening bolt, an external spring connecting rod of the oil cylinder servo machine is connected with an internal connecting rod;
step 3, mounting a rock sample:
firstly, mounting a rock sample in a cavity area formed by a silicon carbide metal mesh bag; secondly, starting an oil cylinder servo, and aligning the center of the sample with the centers of the incident rod and the transmission rod respectively by adjusting the pressure of the oil cylinder servo; then adjusting the incident rod and the transmission rod to be in contact with the sample;
step 4, setting test parameters:
firstly, setting the pressure of the oil cylinder servo machine as a target pressure, and pressurizing each oil cylinder servo machine to the target value; secondly, after the confining pressure is constant, heating the rock sample to a target temperature through a heating element;
step 5, SHPB impact test:
firstly, adjusting a trigger device and a data collection device of an SHPB dynamic loading unit; secondly, performing a three-dimensional SHPB impact test and recording data;
step 6, repeated test:
firstly, unloading confining pressure after the impact test is finished, and waiting for cooling; secondly, opening the fastening bolt, removing the connection between the two outer and inner spring connecting rods of the upper rigid heat-insulation cover, and opening the upper rigid heat-insulation cover; and then taking out the rock sample, putting the rock sample into a new sample, closing the upper rigid heat-insulation cover, connecting the inner spring connecting rod and the outer spring connecting rod, and locking the fastening bolt to repeat the steps 4-6.
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