CN112964540B - Rock dynamic performance testing device and method under high water pressure and high ground stress coupling - Google Patents
Rock dynamic performance testing device and method under high water pressure and high ground stress coupling Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/30—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight
- G01N3/307—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight generated by a compressed or tensile-stressed spring; generated by pneumatic or hydraulic means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0003—Steady
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/001—Impulsive
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0044—Pneumatic means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
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Abstract
The invention relates to a rock dynamics testing technology, in particular to a rock dynamic performance testing device and method under high water pressure and high ground stress coupling. The invention realizes the dynamic performance test of the rock under the coupling of indoor simulation high water pressure and high ground stress, and has certain guiding significance for the analysis and judgment of the dynamic mechanical properties of deep rock. Meanwhile, the device has the characteristics of low cost and convenient test; the confining pressure loading device can maintain the confining pressure unchanged for more than 12 hours.
Description
Technical Field
The invention relates to a rock dynamics testing technology, in particular to a rock dynamic performance testing device and method under high water pressure and high ground stress coupling.
Background
With the continuous deepening of underground engineering in China, geological conditions tend to be complex, and deep rock mass mechanics problems become important problems related to national property and people life safety, and are also focus problems of research in the fields of rock mass mechanics and underground engineering at home and abroad. The high pore water pressure and high ground stress are commonly existed in deep rock mass engineering such as deep buried tunnel and mineral resource exploitation, and the two mutually influence and interact to jointly control the damage evolution and deformation characteristics of the rock (body), thus forming the water-rock coupling problem with typical multidisciplinary cross characteristics. Meanwhile, the high-pressure water has softening and corrosion effects on the rock, so that the mechanical and deformation characteristics of the rock are changed. And the dynamic mechanical properties of the rock (body) with high void water pressure and high ground stress tend to be complicated under the action of dynamic loads such as blasting and the like. Therefore, the dynamic mechanical properties of the rock under the coupling action of high water pressure and high ground stress are researched, and important theoretical basis is provided for safe and efficient construction and operation of rock mass engineering, safety and stability evaluation of surrounding rock mass and disaster prevention and reduction of rock mass engineering structure.
At present, the dynamic mechanical property test of the rock (body) under the coupling action of high pore water pressure and high ground stress is not carried out, which greatly hinders the research work in the field.
Disclosure of Invention
The invention aims to provide a device and a method for testing dynamic performance of rock under high water pressure and high ground stress coupling, the device is simple to operate and convenient to test, and can meet the dynamic response and stress wave propagation tests of the rock under the actions of different water pressures, axial static stresses, confining pressures and impact speeds.
The technical scheme of the invention is as follows:
The rock dynamic performance testing device under the coupling of high water pressure and high ground stress comprises a Hopkinson pressure bar testing system, wherein a confining pressure loading device is arranged between an incident bar and a transmission bar of the Hopkinson pressure bar testing system;
The confining pressure loading device comprises a confining pressure cylinder with a horizontal axial lead, the confining pressure cylinder is fixed on the support, end covers are respectively fixed at two ends of the confining pressure cylinder, and a rubber ring is arranged between the end covers and the confining pressure cylinder; the axle center of the end cover is provided with a stepped through hole, and the incident rod and the transmission rod are respectively inserted into the stepped through holes of the end covers at the two ends; the sealing ring and the gland are sleeved on one end of the incident rod and the transmission rod, which is inserted into the stepped through hole of the end cover, in sequence; the gland presses the sealing ring on the step of the stepped through hole of the end cover, and the gland is fastened on the inner side of the end cover;
A cylindrical rubber shaft sleeve with two thin ends and a large middle part is arranged on the axis of the confining pressure cylinder, two ends of the rubber shaft sleeve are respectively sleeved on the inner step steps of the end covers at two sides, and a closed oil cavity is formed between the outer circle of the rubber shaft sleeve and the inner wall of the confining pressure cylinder; the top of the confining pressure cylinder is provided with an oil cavity exhaust hole, the oil cavity exhaust hole is provided with a threaded plug, the bottom of the confining pressure cylinder is provided with an oil cavity oil inlet hole, and the oil cavity oil inlet hole is connected with a hydraulic pump; a closed water cavity is formed between the inner circle of the rubber shaft sleeve and the left gland and the right gland, a water cavity exhaust hole is arranged above the right end cover and the gland, a screw plug is arranged on the water cavity exhaust hole, a water cavity water inlet hole is arranged below the left end cover and the gland, and the water cavity water inlet hole is connected with a manual pressure testing pump.
The Hopkinson pressure bar testing system comprises an air chamber, a punch, a laser velocimeter, an incident bar, a transmission bar, a shaft pressure loading device and a data acquisition and processing system; the high-pressure air tank is communicated with the air chamber, and the axes of the punch, the incident rod and the transmission rod are overlapped; the axial pressure of the transmission rod is applied by an axial pressure loading device, the axial pressure loading device is supplied by a pressurizing pump, the incident rod and the transmission rod are both provided with strain gauges, and the strain gauges are connected with a data acquisition and processing system; the data acquisition and processing system consists of a dynamic strain gauge, an oscilloscope and a computer.
A rock dynamic performance testing method under high water pressure and high ground stress coupling comprises the following steps:
Firstly, preparing a rock sample and a rubber shaft sleeve, soaking the rock sample in water for 18-23 days, and taking out the rock sample until the quality of the rock sample is not changed;
secondly, sleeving an end cover, a rubber ring, a sealing ring and a gland in sequence at one end of an incident rod and one end of a transmission rod of the Hopkinson pressure bar testing system respectively, then fastening the gland on the inner side of the end cover, and tightly pressing the sealing ring on a step of a step through hole of the end cover by the gland;
Thirdly, the rock sample after being soaked and saturated is plugged into a rubber shaft sleeve;
Fourthly, placing the confining pressure cylinder between an incidence rod and a transmission rod of the Hopkinson pressure bar testing system, and ensuring that axial lines of the confining pressure cylinder, the incidence rod and the transmission rod are coincident;
Fastening the end cover on one side of the incidence rod assembled in the second step on the right end of the confining pressure cylinder, putting the rubber shaft sleeve filled with the rock sample into the confining pressure cylinder from the left end of the confining pressure cylinder, and sleeving the right end of the rubber shaft sleeve on the inner step of the right end cover;
Step six, sleeving the left end of the rubber shaft sleeve on the step on the inner side of the end cover on one side of the transmission rod assembled in the step two, fastening the left end cover on the left end of the confining pressure cylinder, and padding a rubber ring between the end cover and the confining pressure cylinder;
Seventh, the hydraulic pump connected with the oil inlet hole of the oil cavity in the confining pressure cylinder is pressed down, and when oil overflows from the oil cavity exhaust hole at the top of the confining pressure cylinder, the oil cavity exhaust hole is blocked by a threaded plug;
Step eight, a manual pressure testing pump connected with a water cavity water inlet hole is pressed down, water is gradually injected into the water cavity in the confining pressure cylinder, and when water overflows from the water cavity air vent hole, the water cavity air vent hole is plugged by a threaded plug;
Ninth, continuously pressing down the hydraulic pump connected with the oil inlet hole of the oil cavity in the confining pressure cylinder, observing a pressure gauge of the hydraulic pump, and stopping pressurizing when the oil pressure is stabilized at a set pressure value P 1;
A tenth step of continuously pressing down a manual pressure test pump connected with the water inlet hole of the water cavity, observing a pressure gauge of the manual pressure test pump, and stopping pressurizing when the water pressure is stabilized at a set value P 2;
Eleventh step, axial static load is applied to the rock sample by an axial pressure loading device of the Hopkinson pressure bar testing system until a set pressure value P s is reached;
Twelfth, releasing gas of the high-pressure gas tank, and enabling the gas to drive the punch to impact the incident rod through the gas chamber so as to finish dynamic loading of the rock sample;
And thirteenth step, the dynamic mechanical test data of the rock sample under high water pressure and high ground stress coupling are collected through the connection of the strain gauge on the incident rod and the transmission rod and the data collection processing system, and the collected data are analyzed and processed to study the stress wave propagation and attenuation rule of the rock sample.
The invention realizes the dynamic performance test of the rock under the coupling of indoor simulation high water pressure and high ground stress, and has certain guiding significance for the analysis and judgment of the dynamic mechanical properties of deep rock. Meanwhile, the device has the characteristics of low cost and convenient test; the confining pressure loading device can maintain the confining pressure unchanged for more than 12 hours.
Drawings
Fig. 1 is a schematic structural diagram of a rock dynamic performance testing apparatus of the present invention.
FIG. 2 is a schematic view (in cross section) of the confining pressure loading device of FIG. 1.
Wherein: 1-axle pressure loading device, 2-transmission rod, 3-strain gage, 4-confining pressure loading device, 5-rock sample, 6-incidence rod, 7-punch, 8-air chamber, 9-booster pump, 10-dynamic strain gauge, 11-oscilloscope, 12-computer, 13-laser velocimeter, 14-confining pressure cylinder, 15-end cover, 16-screw, 17-gland, 18-sealing ring, 19-rubber ring, 20-oil cavity oil inlet hole, 21-oil cavity exhaust hole, 22-water cavity water inlet hole, 23-water cavity exhaust hole, 24-rubber shaft sleeve.
The arrows in fig. 1 indicate the axial compression loading direction.
Detailed Description
According to the invention, by applying axial pressure and confining pressure to the rock sample 5 and combining a Hopkinson pressure bar test system, rock dynamic performance test under the coupling action of high water pressure and high ground stress is simulated.
As shown in fig. 1, the rock dynamic performance testing device comprises a hopkinson pressure bar testing system and a confining pressure loading device 4.
As shown in fig. 2, the confining pressure loading device 4 includes a confining pressure cylinder 14 with a horizontal axial lead, the confining pressure cylinder 14 is fixed on a support, two ends of the confining pressure cylinder 14 are respectively fixed with an end cover 15 through screws 16, and a rubber ring 19 is arranged between the end cover 15 and the confining pressure cylinder 14; the axle center of the end cover 15 is provided with a stepped through hole, and the incident rod 6 and the transmission rod 2 are respectively inserted into the stepped through holes of the end covers 15 at the two ends; a sealing ring 18 and a gland 17 are sleeved on one end of the incident rod 6 and the transmission rod 2, which are inserted into the stepped through hole of the end cover 15 in sequence; the gland 17 compresses the sealing ring 18 on the step of the stepped through hole of the end cover 15, and the gland 17 is fastened on the inner side of the end cover 15 through a screw;
A cylindrical rubber shaft sleeve 24 with two thin ends and a large middle part is arranged on the axis of the confining pressure cylinder 14, two ends of the rubber shaft sleeve 24 are respectively sleeved on the inner step steps of the end covers 15 at two sides, and a closed oil cavity is formed between the outer circle of the rubber shaft sleeve 24 and the inner wall of the confining pressure cylinder 14; the top of the confining pressure cylinder 14 is provided with an oil cavity exhaust hole 21, a threaded plug is arranged on the oil cavity exhaust hole 21, the bottom of the confining pressure cylinder 14 is provided with an oil cavity oil inlet hole 20, and the oil cavity oil inlet hole 20 is connected with a hydraulic pump; a closed water cavity is formed between the inner circle of the rubber shaft sleeve 24 and the left and right gland 17, a water cavity exhaust hole 23 is arranged above the right end cover 15 and the gland 17, a thread plug is arranged on the water cavity exhaust hole 23, a water cavity water inlet hole 22 is arranged below the left end cover and the gland, and the water cavity water inlet hole 22 is connected with a manual pressure test pump;
The Hopkinson pressure bar testing system comprises an air chamber 8, a punch 7, a laser velocimeter 13, an incidence bar 6, a transmission bar 2, an axial pressure loading device 1 and a data acquisition and processing system. The high-pressure gas tank is communicated with the gas chamber 8, the axes of the punch 7, the incidence rod 6 and the transmission rod 2 are overlapped, and a confining pressure loading device 4 is arranged between the incidence rod 6 and the transmission rod 2. The axial pressure of the transmission rod 2 is applied by an axial pressure loading device 1, the axial pressure loading device 1 is supplied by a pressurizing pump 9, the incidence rod 6 and the transmission rod 2 are both provided with strain gauges 3, and the strain gauges 3 are connected with a data acquisition and processing system. The data acquisition and processing system consists of a dynamic strain gauge 10, an oscilloscope 11 and a computer 12.
The confining pressure cylinder 14 is a hollow cylinder with a support. Eight screw holes are distributed at two ends of the confining pressure cylinder 14, and screws 16 are arranged in the screw holes for fixing end covers 15 at two ends. In order to achieve a better sealing effect, the end surfaces of the two ends of the confining pressure cylinder 14 are respectively provided with an arc groove, and a rubber ring 19 can be placed. After the end covers 15 are respectively fixed at the two ends of the confining pressure cylinder 14, the rubber ring 19 between the two ends can be extruded, so that the overall tightness can be better improved, and oil leakage can be prevented. Meanwhile, in order to facilitate the disassembly of the end caps 15 at both ends, two symmetrical blind screw holes are specially formed at the outer side of the end caps 15. When the screw is dismounted, the screw can be screwed into the blind screw hole, two hands hold the two screws, and the end cover 15 is rotated left and right, so that the screw can be taken out.
The confining pressure cylinder 14 is made of chrome-nickel alloy, and is a special material for pressure equipment. Stainless steel plates are welded at both ends of the confining pressure cylinder 14 as supports for the convenience of the test. For better placing the end cover 15 and the rubber ring 19, the two end ports of the confining pressure cylinder 14 are arranged in a stepped shape.
The end cover 15 is made of chrome-nickel alloy.
A rock dynamic performance testing method under high water pressure and high ground stress coupling comprises the following steps:
Firstly, preparing a cylindrical red sandstone sample with the diameter of 50mm and the length of 50mm and a rubber sleeve 24, soaking the red sandstone sample in water for 20 days, and taking out the red sandstone sample until the quality of the red sandstone sample is not changed;
secondly, respectively sleeving an end cover 15, a rubber ring 19, a sealing ring 18 and a gland 17 at one end of an incident rod 6 and one end of a transmission rod 2 of the Hopkinson pressure bar testing system in sequence, then fastening the gland 17 at the inner side of the end cover 15 by using a screw, and tightly pressing the sealing ring 18 on a step of a step through hole of the end cover 15 by using the gland 17;
thirdly, the soaked and saturated red sandstone sample is plugged into the rubber shaft sleeve 24;
Fourthly, placing the confining pressure cylinder 14 between the incidence rod 6 and the transmission rod 2 of the Hopkinson pressure bar test system, and ensuring that the axial leads of the confining pressure cylinder 14, the incidence rod 6 and the transmission rod 2 are coincident;
Fifthly, fastening the end cover 15 on one side of the incidence rod 6 assembled in the second step on the right end of the confining pressure cylinder 14 by using a screw 16, putting a rubber shaft sleeve 24 filled with a red sandstone sample into the confining pressure cylinder 14 from the left end of the confining pressure cylinder 14, and sleeving the right end of the rubber shaft sleeve 24 on an inner step of the end cover 15 on the right side;
Step six, the left end of the rubber shaft sleeve 24 is sleeved on the step of the inner side of the end cover 15 on one side of the transmission rod 2 assembled in the step two, the left end cover 15 is fastened on the left end of the confining pressure cylinder 14, and a rubber ring is arranged between the end cover 15 and the confining pressure cylinder 14;
Seventh, the hydraulic pump connected with the oil cavity oil inlet hole 20 in the confining pressure cylinder 14 is pressed down, and when oil overflows from the oil cavity exhaust hole 21 at the top of the confining pressure cylinder 14, the oil cavity exhaust hole 21 is plugged by a threaded plug;
Eighth step, the manual pressure testing pump connected with the water inlet hole 22 of the water cavity is pressed down, water is gradually injected into the water cavity in the confining pressure cylinder 14, and when water overflows from the water cavity exhaust hole 23, the water cavity exhaust hole 23 is plugged by a threaded plug;
Ninth, continuing to press down the hydraulic pump connected with the oil inlet hole 20 of the oil cavity in the confining pressure cylinder 14, observing a pressure gauge of the hydraulic pump, and stopping pressurizing when the oil pressure is stabilized at a set pressure value P 1;
A tenth step of continuously pressing down a manual pressure test pump connected with the water inlet hole 22 of the water cavity, observing a pressure gauge of the manual pressure test pump, and stopping pressurizing when the water pressure is stabilized at a set value P 2;
eleventh step, axial static load is applied to the red sandstone sample by an axial pressure loading device 1 of the Hopkinson pressure bar test system until a set pressure value P s is reached;
Twelfth, releasing gas of the high-pressure gas tank, and driving the punch 7 to impact the incidence rod 6 by the gas chamber 8 to finish dynamic loading of the red sandstone sample;
And thirteenth step, collecting dynamic mechanical test data of the red sandstone sample under high water pressure and high ground stress coupling through the connection of the strain gauge 3 on the incident rod 6 and the transmission rod 2 and a data collecting and processing system, and analyzing and processing the collected data to study the dynamic mechanical properties of the red sandstone sample.
The invention provides a research idea which is convenient and quick, has strong reliability and lower cost for developing the research work of the mechanical properties of deep rocks.
Claims (3)
1. The utility model provides a rock dynamic performance testing arrangement under high water pressure and high ground stress coupling, includes hopkinson depression bar test system, characterized by: a confining pressure loading device is arranged between an incident rod and a transmission rod of the Hopkinson pressure bar testing system;
The confining pressure loading device comprises a confining pressure cylinder with a horizontal axial lead, the confining pressure cylinder is fixed on the support, end covers are respectively fixed at two ends of the confining pressure cylinder, and a rubber ring is arranged between the end covers and the confining pressure cylinder; the axle center of the end cover is provided with a stepped through hole, and the incident rod and the transmission rod are respectively inserted into the stepped through holes of the end covers at the two ends; the sealing ring and the gland are sleeved on one end of the incident rod and the transmission rod, which is inserted into the stepped through hole of the end cover, in sequence; the gland presses the sealing ring on the step of the stepped through hole of the end cover, and the gland is fastened on the inner side of the end cover;
A cylindrical rubber shaft sleeve with two thin ends and a large middle part is arranged on the axis of the confining pressure cylinder, two ends of the rubber shaft sleeve are respectively sleeved on the inner step steps of the end covers at two sides, and a closed oil cavity is formed between the outer circle of the rubber shaft sleeve and the inner wall of the confining pressure cylinder; the top of the confining pressure cylinder is provided with an oil cavity exhaust hole, the oil cavity exhaust hole is provided with a threaded plug, the bottom of the confining pressure cylinder is provided with an oil cavity oil inlet hole, and the oil cavity oil inlet hole is connected with a hydraulic pump; a closed water cavity is formed between the inner circle of the rubber shaft sleeve and the left gland and the right gland, a water cavity exhaust hole is arranged above the right end cover and the gland, a screw plug is arranged on the water cavity exhaust hole, a water cavity water inlet hole is arranged below the left end cover and the gland, and the water cavity water inlet hole is connected with a manual pressure testing pump.
2. The device for testing the dynamic performance of the rock under the coupling of high water pressure and high ground stress according to claim 1, wherein the device is characterized in that: the Hopkinson pressure bar testing system comprises an air chamber, a punch, a laser velocimeter, an incident bar, a transmission bar, a shaft pressure loading device and a data acquisition and processing system; the high-pressure air tank is communicated with the air chamber, and the axes of the punch, the incident rod and the transmission rod are overlapped; the axial pressure of the transmission rod is applied by an axial pressure loading device, the axial pressure loading device is supplied by a pressurizing pump, the incident rod and the transmission rod are both provided with strain gauges, and the strain gauges are connected with a data acquisition and processing system; the data acquisition and processing system consists of a dynamic strain gauge, an oscilloscope and a computer.
3. The method for testing the dynamic performance of the rock under the coupling of high water pressure and high ground stress by the device as claimed in claim 1, which is characterized by comprising the following steps:
Firstly, preparing a rock sample and a rubber shaft sleeve, soaking the rock sample in water for 18-23 days, and taking out the rock sample until the quality of the rock sample is not changed;
secondly, sleeving an end cover, a rubber ring, a sealing ring and a gland in sequence at one end of an incident rod and one end of a transmission rod of the Hopkinson pressure bar testing system respectively, then fastening the gland on the inner side of the end cover, and tightly pressing the sealing ring on a step of a step through hole of the end cover by the gland;
Thirdly, the rock sample after being soaked and saturated is plugged into a rubber shaft sleeve;
Fourthly, placing the confining pressure cylinder between an incidence rod and a transmission rod of the Hopkinson pressure bar testing system, and ensuring that axial lines of the confining pressure cylinder, the incidence rod and the transmission rod are coincident;
Fastening the end cover on one side of the incidence rod assembled in the second step on the right end of the confining pressure cylinder, putting the rubber shaft sleeve filled with the rock sample into the confining pressure cylinder from the left end of the confining pressure cylinder, and sleeving the right end of the rubber shaft sleeve on the inner step of the right end cover;
Step six, sleeving the left end of the rubber shaft sleeve on the step on the inner side of the end cover on one side of the transmission rod assembled in the step two, fastening the left end cover on the left end of the confining pressure cylinder, and padding a rubber ring between the end cover and the confining pressure cylinder;
Seventh, the hydraulic pump connected with the oil inlet hole of the oil cavity in the confining pressure cylinder is pressed down, and when oil overflows from the oil cavity exhaust hole at the top of the confining pressure cylinder, the oil cavity exhaust hole is blocked by a threaded plug;
Step eight, a manual pressure testing pump connected with a water cavity water inlet hole is pressed down, water is gradually injected into the water cavity in the confining pressure cylinder, and when water overflows from the water cavity air vent hole, the water cavity air vent hole is plugged by a threaded plug;
Ninth, continuously pressing down the hydraulic pump connected with the oil inlet hole of the oil cavity in the confining pressure cylinder, observing a pressure gauge of the hydraulic pump, and stopping pressurizing when the oil pressure is stabilized at a set pressure value P 1;
A tenth step of continuously pressing down a manual pressure test pump connected with the water inlet hole of the water cavity, observing a pressure gauge of the manual pressure test pump, and stopping pressurizing when the water pressure is stabilized at a set value P 2;
Eleventh step, axial static load is applied to the rock sample by an axial pressure loading device of the Hopkinson pressure bar testing system until a set pressure value P s is reached;
Twelfth, releasing gas of the high-pressure gas tank, and enabling the gas to drive the punch to impact the incident rod through the gas chamber so as to finish dynamic loading of the rock sample;
And thirteenth step, the dynamic mechanical test data of the rock sample under high water pressure and high ground stress coupling are collected through the connection of the strain gauge on the incident rod and the transmission rod and the data collection processing system, and the collected data are analyzed and processed to study the stress wave propagation and attenuation rule of the rock sample.
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| CN115290469B (en) * | 2022-07-18 | 2024-11-26 | 四川大学 | Environmental simulation structure for Hopkinson bar test system |
| CN115290468B (en) * | 2022-07-18 | 2025-02-11 | 四川大学 | Capsule-shaped environment simulation body structure for Hopkinson bar test system |
| CN115290473B (en) * | 2022-07-18 | 2024-11-26 | 四川大学 | Water-mechanical coupling Hopkinson bar test system |
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