CN110865012B - Rock material in-situ seepage measurement system and method based on Hopkinson bar - Google Patents
Rock material in-situ seepage measurement system and method based on Hopkinson bar Download PDFInfo
- Publication number
- CN110865012B CN110865012B CN201911125368.XA CN201911125368A CN110865012B CN 110865012 B CN110865012 B CN 110865012B CN 201911125368 A CN201911125368 A CN 201911125368A CN 110865012 B CN110865012 B CN 110865012B
- Authority
- CN
- China
- Prior art keywords
- oil
- transmission
- vertical plate
- pressure
- incidence
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000011435 rock Substances 0.000 title claims abstract description 61
- 239000000463 material Substances 0.000 title claims abstract description 35
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 34
- 238000005259 measurement Methods 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 15
- 230000005540 biological transmission Effects 0.000 claims abstract description 86
- 230000035699 permeability Effects 0.000 claims abstract description 23
- 230000009471 action Effects 0.000 claims abstract description 8
- 238000012360 testing method Methods 0.000 claims abstract description 8
- 239000003921 oil Substances 0.000 claims description 141
- 238000002347 injection Methods 0.000 claims description 21
- 239000007924 injection Substances 0.000 claims description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 20
- 230000008859 change Effects 0.000 claims description 10
- 238000007789 sealing Methods 0.000 claims description 10
- 238000007599 discharging Methods 0.000 claims description 9
- 230000008569 process Effects 0.000 claims description 8
- 239000010720 hydraulic oil Substances 0.000 claims description 7
- 230000003204 osmotic effect Effects 0.000 claims description 5
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 229920006395 saturated elastomer Polymers 0.000 claims description 3
- 230000006835 compression Effects 0.000 claims description 2
- 238000007906 compression Methods 0.000 claims description 2
- 238000011160 research Methods 0.000 abstract description 5
- 230000007246 mechanism Effects 0.000 abstract description 3
- 238000013461 design Methods 0.000 abstract description 2
- RRLHMJHRFMHVNM-BQVXCWBNSA-N [(2s,3r,6r)-6-[5-[5-hydroxy-3-(4-hydroxyphenyl)-4-oxochromen-7-yl]oxypentoxy]-2-methyl-3,6-dihydro-2h-pyran-3-yl] acetate Chemical compound C1=C[C@@H](OC(C)=O)[C@H](C)O[C@H]1OCCCCCOC1=CC(O)=C2C(=O)C(C=3C=CC(O)=CC=3)=COC2=C1 RRLHMJHRFMHVNM-BQVXCWBNSA-N 0.000 description 10
- 101100328887 Caenorhabditis elegans col-34 gene Proteins 0.000 description 9
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 8
- 239000011148 porous material Substances 0.000 description 6
- 239000007789 gas Substances 0.000 description 5
- 238000005422 blasting Methods 0.000 description 4
- 239000003345 natural gas Substances 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 3
- 238000005065 mining Methods 0.000 description 3
- 239000003209 petroleum derivative Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- 230000036316 preload Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 241000282414 Homo sapiens Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001808 coupling effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000011326 mechanical measurement Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000000053 physical method Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
-
- 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
Abstract
The invention discloses a rock material in-situ seepage measurement system and method based on a Hopkinson bar, comprising a platform (19), a separated Hopkinson bar and an improved rock material in-situ seepage measurement device, wherein the separated Hopkinson bar is used for providing dynamic loading test conditions; -said axial preloading means (20) for providing a preloaded axial stress; the improved rock material in-situ seepage measurement device transmits the preloaded axial stress to the transmission ram (5) through the transmission rod (22), and then to the sample (6), so that the axial stress of the sample (6) is preloaded. The invention can realize dynamic impact loading of the rock under different ground stress conditions, and respectively measure the permeability coefficient before and after loading, so as to provide powerful support for researching the permeability evolution mechanism of the rock under the dynamic load action under the deep occurrence condition, and the result can provide accurate and reliable experimental parameters for practical engineering and reference for engineering design and scientific research.
Description
Technical Field
The invention relates to the technical field of rock dynamic physical and mechanical measurement, in particular to an improved rock material in-situ seepage measurement system and method.
Background
Petroleum, natural gas, etc. are important energy sources for human beings, and the exploitation amount thereof is always high. As the exploitation of shallow oil and gas is depleted, people gradually exploit the army towards unconventional oil and gas resources (deep petroleum and natural gas). However, the development of the deep petroleum and natural gas is restricted by the defects of large difficulty, high exploitation cost and the like in the exploitation process of the deep petroleum and natural gas. With the continuous progress of deep mining technology, related researches and engineering practices show that increasing the permeability of underground deep rock mass is an effective means for improving the deep oil and gas mining efficiency. At present, hydraulic fracturing, blasting permeation enhancement and ultrasonic enhanced oil recovery technologies are the main permeation enhancement modes. Because of complex occurrence conditions, the mechanical behavior of the deep rock after the blasting load is difficult to monitor in real time, the change of the permeability coefficient before and after the blasting load is more inaccurate to measure, and the existing theory cannot completely explain and predict the change rule of the permeability performance of the deep rock after the dynamic load. Therefore, the deep research on the permeability evolution mechanism of the rock under the dynamic load action under the deep occurrence condition is needed by means of an indoor test. On the other hand, due to the action of dynamic loads such as earthquake, blasting and the like, surrounding rock or underground engineering structures often generate damages of different degrees, and then the permeability of the rock mass is influenced, so that a series of geological disaster problems are caused. Therefore, understanding the evolution law of permeability of deep rock under dynamic load is a key scientific problem of the front edge of deep geological engineering and geotechnical engineering disciplines and a great topic to be solved urgently.
Currently, research on rock permeability is all dependent on experimental studies. The overburden porosity permeameter developed by CoreTest in the united states can apply confining pressure to a core sample and simultaneously apply pore water pressure to measure and calculate the porosity of the rock at high pressure and the change in permeability. The triaxial tester for the high-temperature and high-pressure rock mass developed by the university of Chinese mining can apply gas pressure with certain pressure difference at two ends of a sample while applying high temperature and high confining pressure to the rock sample, so that the permeability of the rock sample is calculated by measuring the gas flow; in addition, there are MTS815.02 type rock mechanics electrohydraulic servo systems that can triaxial load a rock sample and obtain its permeability coefficient by measuring the fluid flow under the action of pore pressure gradients. The experimental equipment can only realize the mechanical property test of the rock under the coupling effect of the osmotic pressure and static or dynamic load, and can not measure the osmotic coefficient of the rock after dynamic load disturbance under the deep occurrence condition. FDES-641 triaxial displacement system produced by American core company can realize measurement of permeability coefficient of rock sample in confining pressure state. The above test system can only measure the permeability coefficient of the rock in a static confining pressure state, and cannot consider the permeability coefficient change after the dynamic impact load is influenced.
Disclosure of Invention
Aiming at the problems, the invention provides a rock material in-situ seepage measurement system and method based on a Hopkinson bar, which realize dynamic impact loading of rock under different ground stress conditions and respectively measure permeability coefficients before and after loading.
The invention discloses a rock material in-situ seepage measurement system based on a Hopkinson bar, which comprises a platform 19, a separated Hopkinson bar and a rock material in-situ seepage measurement device, wherein the separated Hopkinson bar is used for providing dynamic loading test conditions;
The split Hopkinson pressure bar comprises a bullet 23, an incidence rod 21, a momentum trap 25, a transmission rod 22 and an axial preloading device 20, wherein the components are fixed on the platform 19 through a support 24, the rock material in-situ seepage measuring device is arranged on the platform 19 and is positioned between the incidence rod 21 and the transmission rod 22, and the axial preloading device 20 and the improved rock material in-situ seepage measuring device are connected with an oil pump 18 through an oil pipe 17; after the bullet 23 is launched, a concentric collision with the incident beam 12 occurs, so that a train of compression stress waves is generated, and the stress waves propagate along the incident beam 21 to the incident beam 4 and then to the sample 6, and further continue to propagate to the transmission beam 5 and the transmission beam 22;
The axial preloading device 20 is used for providing preloading axial stress, and the provided preloading axial stress is transmitted to the transmission plunger 5 through the transmission rod 22 and then transmitted to the sample 6 so as to preload the axial stress of the sample 6;
the improved rock material in-situ seepage measurement device comprises an oil cylinder 1, an incidence vertical plate 2, a transmission vertical plate 3, an incidence ram 4, a transmission ram 5, a heat shrinkage tube 7, a sealing tile 8, a guide rail bracket 9 and a guide rail 10 which are arranged on a platform 19, wherein the concrete structure is as follows:
The incident vertical plate 2 and the guide rail bracket 9 are fixedly connected with the platform 19 through bolts respectively; the guide rail bracket 9 and the incidence vertical plate 2 are fixedly connected with two guide rails 10, two round holes with the same diameter as the guide rails 10 are formed in the lower part of the transmission vertical plate 3, and the guide rails 10 penetrate through the round holes in the transmission vertical plate 3, so that support is provided for the transmission vertical plate 3, and the transmission vertical plate 3 can freely slide on the guide rails 10; an oil cylinder 1 is arranged between the incidence vertical plate 2 and the transmission vertical plate 3, round holes with the same diameters as the incidence plunger 4 and the transmission plunger 5 are arranged at the centers of the incidence vertical plate 2 and the transmission vertical plate 3, and the round holes can be used for the incidence plunger 4 and the transmission plunger 5 to pass through and move freely along the axial direction of the rod piece; the incident vertical plate 2, the transmission vertical plate 3 and the oil cylinder 1 are fixed and clamped through four bolts penetrating through the incident vertical plate 2 and the transmission vertical plate 3; the inner sides of the incidence vertical plate 2 and the transmission vertical plate 3 are provided with annular grooves with the same inner diameter and outer diameter of the oil cylinder 1, so that the oil cylinder 1 is in embedded fit with the incidence vertical plate 2 and the transmission vertical plate 3, the oil cylinder 1 becomes a pressure container during working, and certain pressure is kept in the oil cylinder; the incident vertical plate 2 is provided with an oil filling hole 15 and an exhaust hole 16, and the oil filling hole 15 is connected with an oil pump 18 through an oil pipe 17; after the oil cylinder 1 of the incidence vertical plate 2 and the transmission vertical plate 3 is clamped, hydraulic oil is injected into the oil cylinder 1 through the oil pump 18 and the oil pipe 17 through the oil injection hole 15, air in the oil cylinder 1 is discharged through the exhaust hole 16 until the oil cylinder 1 is filled with the hydraulic oil, and then the pressure in the oil cylinder 1 is increased, so that the pre-confining pressure loading of the sample 6 is realized; the center of the inside of the incidence ram 4 and the transmission ram 5 is provided with a water injection hole 11, one end of the water injection hole 11 is communicated with the outside surface of the incidence ram 4 and the transmission ram 5 which are positioned outside the oil cylinder 1, and is connected with a servo hydraulic press 13 through a water pipe 12; the other end of the water injection hole 11 opens from the bottom surfaces of the incident plunger 4 and the transmissive plunger 5 located inside the cylinder 1.
The invention discloses a rock material in-situ seepage measurement method based on a Hopkinson bar, which comprises the following steps of:
step 1, assembling a split Hopkinson pressure bar and a rock material in-situ seepage measurement device completely;
Step 2, clamping the fully saturated sample 6 between a sealing tile 8 and an incidence ram 4 and a transmission ram 5, and tightly wrapping the outside of the sample by using a heat shrinkage tube 7; after loading, the transmission vertical plate 3 moves to the incident side along the guide rail 10 again, is in close contact with the oil cylinder 1, and fixes and clamps the incident vertical plate 2, the oil cylinder 1 and the transmission vertical plate 3;
Step 3, starting an axial preloading device 20 to apply an axial stress smaller than 1MPa to the sample 6 in advance, and clamping the sample 6 stably; after the axial precompression is applied, the oil pump 18 injects oil into the oil cylinder 1 through the oil injection hole 15, the exhaust hole 15 discharges the oil outwards while injecting the oil, the exhaust hole 15 starts oil discharge after the exhaust is finished, and when the oil discharge flow is uniform and stable, the oil discharge valve is closed; starting the oil pump 18 to apply pressure to the oil in the oil cylinder 1 so as to realize confining pressure loading; the oil pump 18, the axial preloading device 20 and the servo hydraulic press 13 are synchronously regulated to apply pressure to a preset pressure value, the pressure in the oil cylinder 1 of the device and the pressure in the axial preloading device 20 are always kept to be synchronously increased in the pressure applying process, and the pressure in the axial preloading device 20 is always slightly larger than the pressure in the oil cylinder 1;
Step 4, after confining pressure is applied, a certain pressure difference is applied to the sample 6 through a servo hydraulic press 13, so that seepage is stable, and the initial permeability coefficient is measured while the pressure difference is maintained unchanged;
Step 5, after the steps are completed, the sample 6 can be dynamically loaded through a separated Hopkinson bar, the load is required to be strictly controlled in the loading process so that the sample is not crushed, the excessive reflected waves are absorbed through the momentum trap 25, the sample 6 is only loaded by single stress waves, and the rock sample permeability coefficient after single load action is accurately obtained by recording the flow change of a servo hydraulic press;
Step 6, if the osmotic coefficient change is needed to be continuously loaded and measured, repeating the step 5;
And 7, discharging water pressure through a servo hydraulic press (or a pneumatic press) 13, discharging shaft pressure through an oil pump 18, discharging confining pressure through the oil pump 18, recovering oil in the oil cylinder 1 through the exhaust hole 15 and the oil pipe 17, removing the heat shrinkage tube 7, and taking out the sample 6.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides strong support for researching the permeability evolution mechanism of the rock under the dynamic load action under the deep occurrence condition, and the achievement can provide accurate and reliable experimental parameters for practical engineering for engineering design and scientific research reference.
Drawings
Figure 1 is a side view of the rock material in situ seepage measurement device of the present invention,
Figure 2 is a cross-sectional top view of the rock material in situ seepage measurement device of the present invention,
Figure 3 is an elevation view of the rock material in situ seepage measurement device of the present invention,
Figure 4 is a schematic diagram of a hopkinson rod-based rock material in-situ seepage measurement system of the present invention,
Reference numerals:
1. The device comprises an oil cylinder, 2, an incidence vertical plate, 3, a transmission vertical plate, 4, an incidence ram, 5, a transmission ram, 6, a sample, 7, a heat shrinkage tube, 8, a sealing tile, 9, a guide rail bracket, 10, a guide rail, 11, a water injection hole, 12, a wiring, 13, a servo hydraulic press (or a pneumatic press), 14, a bolt, 15, an oil injection hole, 16 and an exhaust hole. 17. Oil pipe, 18, oil pump, 19, platform, 20, axial preloading device, 21, incident rod, 22, transmission rod, 23, bullet, 24, support, 25, momentum trap.
Detailed Description
The invention is further illustrated by the following figures and examples, which are not intended to be limiting.
As shown in fig. 1 to 3, a side view of the rock material in-situ seepage measurement device of the present invention is shown. The device comprises a platform 19, an oil cylinder 1, an incidence vertical plate 2, a transmission vertical plate 3, an incidence ram 4, a transmission ram 5, a heat shrinkage tube 7, a sealing tile 8, a guide rail bracket 9 and a guide rail 10 which are arranged on the platform 19; the specific structure is described as follows:
The platform 19 is used for providing a supporting platform for the components; the incident vertical plate 2 is fixedly connected with the guide rail bracket 9 through bolts and a platform 19 respectively; the guide rail bracket 9 is fixedly connected with two guide rails 10 through bolts 14 at the opening position on the incidence vertical plate 2, two round holes with the same diameter as the guide rails 10 are formed in the lower portion of the transmission vertical plate 3, and the guide rails 10 penetrate through the round holes in the transmission vertical plate 3, so that support is provided for the transmission vertical plate 3, the transmission vertical plate 3 can slide freely on the guide rails 10, and the vertical plate and the oil cylinder can be conveniently detached when samples are assembled and disassembled in an experiment. An oil cylinder 1 is arranged between the incidence vertical plate 2 and the transmission vertical plate 3, round holes with the same diameter as the incidence plunger 4 and the transmission plunger 5 are arranged at the centers of the incidence vertical plate 2 and the transmission vertical plate 3, and the round holes can be used for the two plungers to pass through and move freely; four round holes with the same diameter as the screw rod of the bolt 14 are respectively arranged at the proper positions around the incidence vertical plate 2 and the transmission vertical plate 3 so as to ensure that the incidence vertical plate 2, the transmission vertical plate 3 and the oil cylinder 1 are fixed and clamped through the screw rod 14.
The inner sides of the incidence vertical plate 2 and the transmission vertical plate 3 are provided with annular grooves with the same inner diameter and outer diameter of the oil cylinder 1, so that the oil cylinder 1 is in embedded fit with the incidence vertical plate 2 and the transmission vertical plate 3, and the oil cylinder 1 is screwed and fixed by four bolts 14, so that the oil cylinder 1 becomes a pressure container during operation, and a certain pressure is kept in the oil cylinder.
The incident vertical plate 2 is provided with an oil filling hole 15 and an exhaust hole 16, and the oil filling hole 15 is connected with an oil pump 18 through an oil pipe 17. After the incident vertical plate 2, the transmission vertical plate 3 and the oil cylinder 1 are clamped by the bolts 14, hydraulic oil can be injected into the oil cylinder 1 through the oil pump 18 and the oil pipe 17 and the oil injection hole 15, air in the oil cylinder 1 is discharged through the exhaust hole 16 until the hydraulic oil is filled in the oil cylinder 1, and then the pressure in the oil cylinder 1 is increased, so that the pre-confining pressure loading of the sample 6 is realized.
The working pressure of the oil cylinder 1 can reach 60MPa.
The incidence plunger 4 and the transmission plunger 5 are provided with a water injection hole 11 at the inner center. One end of the water injection hole 11 is opened from the outer side surfaces of the incident ram 4 and the transmission ram 5 which are positioned outside the oil cylinder 1, and is connected with a servo hydraulic press (or an air compressor) 13 through a water pipe 12; the other end of the water injection hole 11 opens from the bottom surfaces of the incident plunger 4 and the transmissive plunger 5 located inside the cylinder 1.
When the rock material in-situ seepage measurement device works, one end of an incident ram 4 and one end of a transmission ram 5 extend into the oil cylinder 1, two sealing tiles 8 are clamped between the two rams, and a sample 6 is clamped between the sealing tiles 8. The heat shrink tube 7 wraps the two sealing tiles 8, the sample 6 and a part of the two striker bars so as to ensure that the sample is separated from hydraulic oil in the oil cylinder 1. A servo hydraulic (or pneumatic) press 13 may inject pore fluid through the water line 12 into the internal pores of the sample 6 and apply pore pressure. The sealing tile 8 has the function of enabling the liquid in the water injection hole 11 to freely enter the pores of the sample 6, and fragments of the sample 6 cannot enter the water injection hole 11 to cause blockage after the sample 6 is broken by impact; the other end of the incident ram 4 and the other end of the transmission ram 5 are respectively in contact with the incident ram 21 and the transmission ram 22 for transmitting dynamic stress wave loads during testing.
Fig. 4 is a schematic diagram of an in-situ seepage measurement system for rock material based on hopkinson rods according to the present invention. The system comprises a split Hopkinson pressure bar and a rock material in-situ seepage measurement device.
The split hopkinson bar structure comprises a bullet 23, an incident bar 21, a momentum trap 25, a transmission bar 22 and an axial preloading device 20, all of which are fixed to a platform 19 by a support 24. The rock material in-situ seepage measurement device is arranged on the experiment platform 19 and is positioned between the incidence rod 21 and the transmission rod 22. The axial preloading device 20 and the rock material in-situ seepage measuring device are connected with the oil pump 18 through the oil pipe 17. The split hopkinson bar is used for providing dynamic loading test conditions, the axial preloading device 20 is used for providing preloading axial stress, and the rock material in-situ seepage measurement device transmits the preloading axial stress to the transmission ram 5 through the transmission bar 22 and further to the sample 6 so as to preload the axial stress of the sample. After the bullet 23 is fired, a concentric impact with the incident beam 12 occurs to produce a train of compressive stress waves that propagate along the incident beam 21 to the incident beam 4 and then on to the sample 6 and further on to the transmissive beam 5 and transmissive beam 22.
The invention relates to a rock material in-situ seepage measurement method based on a Hopkinson bar, which specifically comprises the following working procedures:
Step 1, assembling a split Hopkinson pressure bar and a rock material in-situ seepage measurement device completely according to fig. 4, wherein in the process, a bullet 23, an incidence bar 21, a momentum trap 25, a transmission bar 22 and an axial preloading device 20 are required to be ensured to be fixed on a platform 19 through a support 24 and positioned between the incidence bar 21 and the transmission bar 22, and the bullet 23, the incidence bar 21, the transmission bar 22, the axial preloading device 20, the incidence bar 4 and the transmission bar 5 are ensured to be on the same axis;
step 2, clamping the fully saturated sample 6 between a sealing tile 8 and an incidence ram 4 and a transmission ram 5, and tightly wrapping the outside of the sample by using a heat shrinkage tube 7, as shown in fig. 2; after the loading is completed, the transmissive riser 3 is moved again along the guide rail 10 to the incident side, brought into close contact with the cylinder 1, and the bolts 14 are tightened. The incident vertical plate 2, the oil cylinder 1 and the transmission vertical plate 3 are fixed and fastened by bolts 14;
and 3, starting an axial preloading device 20 to apply an axial stress of less than 1MPa to the sample 6 in advance, and stabilizing the clamping of the sample 6. After the axial precompression is applied, the oil pump 18 injects oil into the oil cylinder 1 through the oil injection hole 15, the exhaust hole 15 discharges the oil outwards while injecting the oil, the exhaust hole 15 starts oil discharge after the exhaust is finished, and when the oil discharge flow is uniform and stable, the oil discharge valve is closed. The oil pump 18 is started to apply pressure to the oil in the oil cylinder 1, so that confining pressure loading is realized. The oil pump 18, the axial preloading device 20, and the servo hydraulic press (or pneumatic press) 13 are synchronously regulated in pressure magnitude, and the three apply pressure to a predetermined pressure value together. It should be noted that the pressure in the cylinder 1 of the device and the pressure in the axial preloading device 20 are always kept to be synchronously increased in the process of applying pressure, and the pressure in the axial preloading device 20 is always slightly larger than the pressure in the cylinder 1;
Step 4, after confining pressure is applied, a certain pressure difference is applied to the sample 6 through a servo hydraulic press (or pneumatic press) 13, so that seepage is stable, and the initial permeability coefficient is measured while the pressure difference is maintained unchanged;
Step 5, after the steps are completed, the sample 6 can be dynamically loaded through a separated Hopkinson bar, and the load is required to be strictly controlled in the loading process so that the sample is not crushed; in addition, it is also necessary to absorb the excess reflected wave through the momentum trap 25 so that the sample 6 is only loaded with a single stress wave; the permeability coefficient of the rock sample after single load action can be accurately obtained by recording the flow change of the servo hydraulic press.
And 6, if the osmotic coefficient change needs to be continuously loaded and measured, repeating the step 5.
And 7, after the experiment is finished, firstly discharging water pressure through a servo hydraulic press (or a pneumatic press) 13, secondly discharging shaft pressure through an oil pump 18, and finally discharging confining pressure through the oil pump 18. The oil in the cylinder 1 is recovered through the exhaust hole 15 and the oil pipe 17. The heat shrink tube 7 was removed, and the sample 6 was taken out.
Claims (2)
1. The rock material in-situ seepage measurement system based on the Hopkinson bar is characterized by comprising a platform (19), an axial preloading device (20), a separated Hopkinson bar and a rock material in-situ seepage measurement device;
The split Hopkinson pressure bar is used for providing dynamic loading test conditions;
-said axial preloading means (20) for providing a preloaded axial stress;
the rock material in-situ seepage measurement device transmits the preloaded axial stress to the transmission ram (5) through the transmission rod (22) and then to the sample (6) so as to realize the preloading of the axial stress of the sample (6);
Wherein:
The split Hopkinson pressure bar comprises a bullet (23), an incidence bar (21), a momentum trap (25), a transmission bar (22) and an axial preloading device (20), wherein the components are fixed on a platform (19) through a support (24), the rock material in-situ seepage measurement device is arranged on the platform (19) and is positioned between the incidence bar (21) and the transmission bar (22), the axial preloading device (20) and the rock material in-situ seepage measurement device are connected with an oil pump (18) through an oil pipe (17), after the bullet (23) is launched, the bullet and the incidence bar (12) are collided in a centering way to generate a series of compression stress waves, and the stress waves are transmitted to a sample (6) after being transmitted to the incidence bar (4) along the incidence bar (21), and then are continuously transmitted to the transmission bar (5) and the transmission bar (22);
The rock material normal position seepage flow measuring device is including hydro-cylinder (1), incidence riser (2), transmission riser (3), incidence ram (4), transmission ram (5), pyrocondensation pipe (7), sealed tile (8), guide rail support (9) and guide rail (10) that set up on platform (19), and specific structure is:
the incidence vertical plate (2) is fixedly connected with the guide rail bracket (9) through bolts and the platform (19) respectively; two guide rails (10) are fixedly connected to the guide rail bracket (9) and the incidence vertical plate (2), two round holes with the same diameter as the guide rails (10) are formed in the lower portion of the transmission vertical plate (3), the guide rails (10) penetrate through the round holes in the transmission vertical plate (3) to provide support for the transmission vertical plate (3), and the transmission vertical plate (3) can slide freely on the guide rails (10); an oil cylinder (1) is arranged between the incidence vertical plate (2) and the transmission vertical plate (3), round holes with the same diameters as those of the incidence collision rod (4) and the transmission collision rod (5) are arranged at the centers of the incidence vertical plate (2) and the transmission vertical plate (3), and the round holes can be used for the incidence collision rod (4) and the transmission collision rod (5) to pass through and move freely; the incident vertical plate (2), the transmission vertical plate (3) and the oil cylinder (1) are fixed and clamped; the inner sides of the incidence vertical plate (2) and the transmission vertical plate (3) are provided with annular grooves with the same inner diameter and outer diameter of the oil cylinder (1), so that the oil cylinder (1) is in embedded fit with the incidence vertical plate (2) and the transmission vertical plate (3), the oil cylinder (1) becomes a pressure container during working, and certain pressure is kept in the oil cylinder; an oil injection hole (15) and an exhaust hole (16) are arranged on the incidence vertical plate (2), and the oil injection hole (15) is connected with an oil pump (18) through an oil pipe (17); after the incident vertical plate (2), the transmission vertical plate (3) and the oil cylinder (1) are clamped, hydraulic oil is injected into the oil cylinder (1) through the oil injection hole (15) by the oil pump (18) and the oil pipe (17), air in the oil cylinder (1) is discharged through the exhaust hole (16) until the oil cylinder (1) is full of the hydraulic oil, and then the pressure in the oil cylinder (1) is increased, so that pre-pressurizing confining pressure loading is carried out on a sample (6); the center of the inside of the incidence ram (4) and the transmission ram (5) is provided with a water injection hole (11), one end of the water injection hole (11) is communicated with the outside surface of the incidence ram (4) and the transmission ram (5) which are positioned outside the oil cylinder (1), and is connected with a servo hydraulic press (13) through a water pipe (12); the other end of the water injection hole (11) is opened from the bottom surfaces of the incident ram (4) and the transmission ram (5) which are positioned in the oil cylinder (1).
2. A hopkinson bar-based rock material in-situ seepage measurement system implemented as claimed in claim 1, wherein the method comprises the steps of:
step 1, assembling a split Hopkinson pressure bar and a rock material in-situ seepage measurement device completely;
Step 2, clamping the fully saturated sample (6) between a sealing tile (8) and an incidence ram (4) and a transmission ram (5), and tightly wrapping the outside of the sample by using a heat shrinkage tube (7); after loading, the transmission vertical plate (3) moves to the incident side along the guide rail (10) again, is in close contact with the oil cylinder (1), and fixes and tightens the incident vertical plate (2), the oil cylinder (1) and the transmission vertical plate (3);
Starting an axial preloading device (20) to apply an axial stress smaller than 1MPa to the sample (6) in advance, and clamping the sample to be stable; after the axial precompression is applied, an oil pump (18) injects oil into the oil cylinder (1) through an oil injection hole (15), the exhaust hole (15) discharges the oil outwards while injecting the oil, the exhaust hole (15) starts oil discharge after the exhaust is finished, and when the oil discharge flow is uniform and stable, an oil discharge valve is closed; starting an oil pump (18) to apply pressure to oil in the oil cylinder (1) so as to realize confining pressure loading; the oil pump (18), the axial preloading device (20) and the servo hydraulic press (13) are synchronously regulated to apply pressure to a preset pressure value, the pressure in the oil cylinder (1) of the device and the pressure in the axial preloading device (20) are always kept to be synchronously increased in the process of applying the pressure, and the pressure in the axial preloading device (20) is always slightly larger than the pressure in the oil cylinder (1);
step 4, after confining pressure is applied, a pressure difference is applied to the sample (6) through a servo hydraulic press (13) to stabilize seepage of the sample, and the initial permeability coefficient of the sample is measured while maintaining the pressure difference unchanged;
step 5, after the steps are completed, the sample (6) can be dynamically loaded through a separated Hopkinson bar, the load is required to be strictly controlled in the loading process so that the sample is not crushed, redundant reflected waves are absorbed through a momentum trap (25), the sample (6) is only loaded by single stress waves, and the rock sample permeability coefficient after the single load action is accurately obtained through recording the flow change of a servo hydraulic press;
step6, if the osmotic coefficient change is needed to be continuously loaded and measured, repeating the step 5;
And 7, discharging water pressure through a servo hydraulic press (13), discharging shaft pressure through an oil pump (18), discharging confining pressure through the oil pump (18), recovering oil in the oil cylinder (1) through an exhaust hole (15) and an oil pipe (17), removing the heat shrinkage pipe (7), and taking out the sample (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911125368.XA CN110865012B (en) | 2019-11-18 | 2019-11-18 | Rock material in-situ seepage measurement system and method based on Hopkinson bar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911125368.XA CN110865012B (en) | 2019-11-18 | 2019-11-18 | Rock material in-situ seepage measurement system and method based on Hopkinson bar |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110865012A CN110865012A (en) | 2020-03-06 |
| CN110865012B true CN110865012B (en) | 2024-04-19 |
Family
ID=69654881
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911125368.XA Active CN110865012B (en) | 2019-11-18 | 2019-11-18 | Rock material in-situ seepage measurement system and method based on Hopkinson bar |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110865012B (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112014245B (en) * | 2020-08-13 | 2023-06-30 | 中国人民解放军空军工程大学 | Hopkinson pressure bar device for high-water-pressure rock breaking test and using method |
| CN112268806B (en) * | 2020-10-14 | 2023-04-14 | 合肥工业大学 | Confining pressure loading device based on separated Hopkinson pressure bar |
| CN112858024B (en) * | 2021-01-27 | 2023-09-22 | 天津大学 | Device and method for measuring dynamic performance of deep rock under hydraulic coupling effect |
| CN113281178A (en) * | 2021-05-19 | 2021-08-20 | 中国人民解放军国防科技大学 | Hydraulic fracturing experimental device and method based on separated Hopkinson pressure bar |
| CN114720266A (en) * | 2022-05-11 | 2022-07-08 | 天津大学 | Multi-field coupling dynamic loading device and experimental method |
| CN116593280A (en) * | 2023-06-20 | 2023-08-15 | 天津大学 | Confining pressure loading device based on Hopkinson bar |
| CN116609171B (en) * | 2023-06-20 | 2024-03-05 | 天津大学 | Composite loading device based on Hopkinson bar |
| CN116773328A (en) * | 2023-06-25 | 2023-09-19 | 中国地质大学（北京） | True triaxial hopkinson pressure bar test device |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101893531A (en) * | 2010-07-20 | 2010-11-24 | 中国工程物理研究院总体工程研究所 | High-temperature Hopkinson pressure bar experimental system with atmosphere protection device |
| CN103471938A (en) * | 2013-08-24 | 2013-12-25 | 中国人民解放军陆军军官学院 | T-shaped Hopkinson torsion bar device |
| CN103616279A (en) * | 2013-11-13 | 2014-03-05 | 中国人民解放军空军工程大学 | Circumferential pressurizing device for large-diameter Hopkinson pressure bar |
| CN104819926A (en) * | 2015-05-20 | 2015-08-05 | 河海大学 | Multi-field coupling penetration test device and method for cracked rock |
| CN104865176A (en) * | 2015-05-27 | 2015-08-26 | 河南理工大学 | Seepage experiment system and method for gas-containing coal under action of impact load |
| CN106370533A (en) * | 2016-08-22 | 2017-02-01 | 中钢集团马鞍山矿山研究院有限公司 | System for carrying out dynamic triaxial test by using high frequency circulating water pressure |
| CN106706197A (en) * | 2016-11-16 | 2017-05-24 | 哈尔滨工程大学 | Subaqueous explosion pressure measurement device based on improved Hopkinson bar |
| CN107764641A (en) * | 2017-09-28 | 2018-03-06 | 清华大学 | The synergy of oil pressure hydraulic pressure aids in split hopkinson press bar confined pressure bringing device |
| CN108375501A (en) * | 2018-01-25 | 2018-08-07 | 南京理工大学 | A kind of data processing method based on split hopkinson press bar experimental technique |
| CN208313767U (en) * | 2018-02-07 | 2019-01-01 | 西安理工大学 | A kind of rock stress coupling test instrument |
-
2019
- 2019-11-18 CN CN201911125368.XA patent/CN110865012B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101893531A (en) * | 2010-07-20 | 2010-11-24 | 中国工程物理研究院总体工程研究所 | High-temperature Hopkinson pressure bar experimental system with atmosphere protection device |
| CN103471938A (en) * | 2013-08-24 | 2013-12-25 | 中国人民解放军陆军军官学院 | T-shaped Hopkinson torsion bar device |
| CN103616279A (en) * | 2013-11-13 | 2014-03-05 | 中国人民解放军空军工程大学 | Circumferential pressurizing device for large-diameter Hopkinson pressure bar |
| CN104819926A (en) * | 2015-05-20 | 2015-08-05 | 河海大学 | Multi-field coupling penetration test device and method for cracked rock |
| CN104865176A (en) * | 2015-05-27 | 2015-08-26 | 河南理工大学 | Seepage experiment system and method for gas-containing coal under action of impact load |
| CN106370533A (en) * | 2016-08-22 | 2017-02-01 | 中钢集团马鞍山矿山研究院有限公司 | System for carrying out dynamic triaxial test by using high frequency circulating water pressure |
| CN106706197A (en) * | 2016-11-16 | 2017-05-24 | 哈尔滨工程大学 | Subaqueous explosion pressure measurement device based on improved Hopkinson bar |
| CN107764641A (en) * | 2017-09-28 | 2018-03-06 | 清华大学 | The synergy of oil pressure hydraulic pressure aids in split hopkinson press bar confined pressure bringing device |
| CN108375501A (en) * | 2018-01-25 | 2018-08-07 | 南京理工大学 | A kind of data processing method based on split hopkinson press bar experimental technique |
| CN208313767U (en) * | 2018-02-07 | 2019-01-01 | 西安理工大学 | A kind of rock stress coupling test instrument |
Non-Patent Citations (1)
| Title |
|---|
| 一维动静组合加载下砂岩动力学特性的试验研究;宫凤强;李夕兵;刘希灵;;岩石力学与工程学报;20101015(第10期);2076-2085 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110865012A (en) | 2020-03-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110865012B (en) | Rock material in-situ seepage measurement system and method based on Hopkinson bar | |
| CN112858024B (en) | Device and method for measuring dynamic performance of deep rock under hydraulic coupling effect | |
| US8082105B2 (en) | Method and apparatus for measuring in-situ stress of rock using thermal crack | |
| Wang et al. | Mechanical behavior of methane infiltrated coal: the roles of gas desorption, stress level and loading rate | |
| Huang et al. | Experimental investigation on the basic law of hydraulic fracturing after water pressure control blasting | |
| Su et al. | Effects of cyclic saturation of supercritical CO2 on the pore structures and mechanical properties of bituminous coal: An experimental study | |
| US11921088B2 (en) | Thermal-stress-pore pressure coupled electromagnetic loading triaxial Hopkinson bar system and test method | |
| Chen et al. | Investigation of hydraulic fracture propagation using a post-peak control system coupled with acoustic emission | |
| CN104535727B (en) | A kind of waterpower sandfrac system | |
| CN109357794A (en) | A kind of method of hydrofracturing test coal-rock mass ground stress | |
| US11828733B2 (en) | Device for testing strength and sealing performance of cement sheath after perforation and using method thereof | |
| CN106198543A (en) | A kind of experimental provision verifying dynamic negative-pressure perforation tunnel cleaning degree | |
| WO2020252988A1 (en) | Strength test method for rotary jet grouting-reinforced coal body | |
| EP3559661B1 (en) | Measurement cell and associated measurement method | |
| CN116411959A (en) | Oil-gas well fracturing test device and method for simulating real stratum environment | |
| Wang et al. | Design of experimental system for supercritical CO2 fracturing under confining pressure conditions | |
| CN114002072B (en) | Fracture rock hydraulic coupling test device and method for applying constant fracture water pressure | |
| CN116165062A (en) | Coalbed rock deformation and crack expansion detection device under different unloading conditions | |
| Hu et al. | An experimental study on the interaction law of the pore gas pressure and stress in gassy coals | |
| Bauer et al. | Helium-Mass-Spectrometry-Permeameter for the measurement of permeability of low permeability rock with application to triaxial deformation conditions | |
| Stoeckhert et al. | Fracture mechanical evaluation of hydraulic fracturing laboratory experiments | |
| Zheng et al. | A novel experimental apparatus for evaluating coal-and-gas outburst risk | |
| Gao et al. | Experimental study on high-pressure air blasting fracture for coal and rock mass | |
| Pan et al. | Development and application of a hydraulic impact test machine for simulating rockburst conditions | |
| Cheng-shun et al. | Experimental study on effect of initial static pore water pressure on static and dynamic shear properties of sand |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |