CN107300507B - Axial-loading and axial-unloading dual-purpose triaxial seepage experiment box and using method - Google Patents

Axial-loading and axial-unloading dual-purpose triaxial seepage experiment box and using method Download PDF

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Publication number
CN107300507B
CN107300507B CN201710594405.6A CN201710594405A CN107300507B CN 107300507 B CN107300507 B CN 107300507B CN 201710594405 A CN201710594405 A CN 201710594405A CN 107300507 B CN107300507 B CN 107300507B
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sample
shaft
axial
pressure
blocking
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CN107300507A (en
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朱合轩
付厚利
亓超
郑明强
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Shandong University of Science and Technology
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Shandong University of Science and Technology
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/08Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
    • G01N3/10Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
    • G01N3/12Pressure testing
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
    • G01N15/08Investigating permeability, pore-volume, or surface area of porous materials
    • G01N15/082Investigating permeability by forcing a fluid through a sample
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/02Details
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0014Type of force applied
    • G01N2203/0016Tensile or compressive
    • G01N2203/0019Compressive
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/003Generation of the force
    • G01N2203/0042Pneumatic or hydraulic means
    • G01N2203/0048Hydraulic means

Abstract

The invention discloses a triaxial seepage experiment box capable of being loaded axially and unloaded axially and a using method thereof. The device can be combined with a triaxial experiment axial compression system to carry out an axial loading seepage experiment with an axial loading system; and the non-axial pressure seepage experiment without an axial loading system can be carried out. The device is small in size, is beneficial to transportation, and can carry out experiments by sampling on site.

Description

Axial-loading and axial-unloading dual-purpose triaxial seepage experiment box and using method
Technical Field
The invention relates to a mechanical experiment technology of a coal sample or a rock sample, in particular to a triaxial seepage experiment box capable of being used in an axial loading and axial no-load mode and a using method thereof.
Background
The stress-seepage coupling rule of the jointed fractured rock mass is a hotspot of the current rock mechanics field research, and the seepage rule of the fractured rock mass can relatively truly reflect the actual situation of the natural geological rock mass under the action of laboratory research three-dimensional stress, and is also the most basic research topic. When various seepage experiments are prevalent nowadays, a lot of theories and experimental results exist, and more experimental conditions and requirements are needed to be met. The hydraulic fracturing permeability-increasing technology is mostly used for field experiments, and the existing triaxial seepage experiment device is large in size, high in manufacturing cost and not suitable for carrying. Is not beneficial to sampling in the field for seepage experiments. General research institutions have axial compression systems for triaxial experiments, but the cost for introducing a whole set of seepage experiment device (connected with the axial compression system) is too high, and the problem of low utilization of the axial compression system exists after the introduction.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a triaxial seepage test box with dual purposes of axial loading and axial unloading and a using method thereof, and the device can be combined with a triaxial test axial compression system to carry out a seepage test of axial loading when an axial loading system is arranged; and the non-axial pressure seepage experiment without an axial loading system can be carried out. The device is small in size, is beneficial to transportation, and can carry out experiments by sampling on site.
The technical solution comprises:
the utility model provides a dual-purpose triaxial seepage flow experiment box, its includes survey system, water inlet system, drainage system, confined pressure control system, sound wave processing system and radial displacement collection system, its characterized in that:
the measuring system comprises a sample, a lifting cover, a centering disc and a shaft pressing steel shaft, wherein the sample is positioned in the centering disc, the centering disc comprises four supporting columns, the lower end of each supporting column is fixed on a chassis, the lifting cover is positioned on the periphery of the centering disc, the lifting cover and the supporting columns share one chassis, a groove is formed in the inner side of an upper disc body of the lifting cover, the upper end of each supporting column can be fixed in the groove, the shaft pressing steel shaft sequentially penetrates through the upper disc body of the lifting cover and the centering disc and then is applied to the surface of the sample, a blocking twisting head is arranged on the shaft pressing steel shaft at the joint of the upper disc body of the lifting cover, a connecting shaft is arranged at the top of the shaft pressing steel shaft, and threads are arranged on the connecting shaft; the top surface and the bottom surface of the sample are provided with water permeable plates, the whole body of the sample is sleeved with a rubber ring, the middle part of the sample is connected with the radial displacement acquisition system, and the top surface and the bottom surface of the sample are provided with the sound wave processing system;
an oil inlet is formed in the chassis, the oil inlet is connected with the confining pressure control system, the confining pressure control system comprises a confining pressure control meter and an oil pressure meter, and the confining pressure control meter and the oil pressure meter are respectively connected to an oil inlet conveying line connected with the oil inlet;
the water inlet system is used for injecting water to the porous disk of the sample, the water inlet system is connected at the porous disk of the top surface of the sample, and the drainage system is connected at the porous disk of the bottom surface of the sample.
In a preferred embodiment of the present invention, the blocking button head is a rotatable joint, and a bolt is installed on the blocking button head, and the bolt penetrates through the blocking button head and is fixed on the surface of the steel axle.
As another preferable scheme of the present invention, the blocking torsion head is composed of a beam and a column, and the beam and the column are fixed in a vertical manner and embedded on the surface of the steel axle.
Preferably, the rubber ring is tightened by a metal hoop, and two ends of the rubber ring are sealed by sealing rings.
The using method of the dual-purpose triaxial seepage experiment box sequentially comprises the following steps:
1) carrying out triaxial seepage experiment
a1, placing the processed sample in a centering disc, putting down and fixing a lifting cover, and hiding a blocking torsion head in a shaft pressing steel shaft;
2, injecting oil into the centering disc, and applying a certain confining pressure through a confining pressure control system after air is exhausted; connecting a shaft pressure loading system by using a connecting shaft, and applying certain shaft pressure;
a3, stopping axial pressure loading in a2, applying water pressure with certain pressure to the sample by using a water inlet system, continuing to connect the axial pressure loading system to apply axial loading until the sample is damaged after the sample is stabilized, or fixing certain axial pressure, and increasing the water pressure until the sample is damaged;
a4, collecting data obtained by a confining pressure control system, a drainage system, a water inlet system, a sound wave processing system and a radial displacement acquisition system and carrying out conventional analysis;
2) carrying out axial no-load seepage experiment
b1, placing the processed sample in a centering disc, exposing the blocking twisting head, and supporting the blocking twisting head in a lifting cover;
b2, injecting oil into the centering disc, and applying a certain confining pressure through a confining pressure control system after air is exhausted;
b3, applying water pressure to the sample by using a water inlet system, and gradually increasing the water pressure until the sample is damaged;
b4, collecting data obtained by the confining pressure control system, the drainage system, the water inlet system, the sound wave processing system and the radial displacement acquisition system and carrying out conventional analysis.
The invention has the following beneficial technical effects:
(1) the experimental box is small in size, convenient to transport and suitable for field experiments;
(2) the device can be combined with a triaxial experiment axial pressure loading system to perform triaxial seepage experiments, and a whole set of seepage experiment device does not need to be introduced, so that the cost is saved;
(3) through installing the axle pressure steel axle to set up on the axle pressure steel axle and block turning round the head, can carry out the seepage flow experiment that has axle pressure and no axle pressure, this experimental apparatus simple structure, the operation of being convenient for, easily control.
Drawings
The invention is further described below with reference to the accompanying drawings:
FIG. 1 is a schematic structural diagram of a triaxial seepage testing cassette capable of being used in both axial loading and axial unloading according to the present invention;
FIG. 2 is a partial cross-sectional view of an internal steel axial compression shaft stop torque head according to the present invention;
FIG. 3 is a schematic view of an internal blocking torque head according to the present invention;
wherein, 1-pillar, 2-lifting cover, 3-axial compression steel shaft, 4-sample, 5-chassis, 6-blocking twist head, 7-water inlet, 8-axial displacement sensor leading-out wire, 9-chassis sealing ring, 10-water outlet, 11-ferrule, 12-rubber ring, 13-water permeable plate, 14-seal, 15-oil inlet, 16-long bolt, 17-radial displacement sensor, 18-groove, 19-blocking twist head beam, 20-twist head, 21-blocking twist head upright post, 22-connecting shaft, 23-valve, 24-flowmeter, 2-5 bucket, 26-confining pressure control table, 27 oil pressure gauge, 28-oil tank, 29-computer, 30-water pressure gauge, 31-power water pump, 32-a flow meter, 33-a water tank, 34-a large bolt, 35-an acoustic emission probe, 36-an oil feeding port, 37-an acoustic processor and a radial displacement collector.
Detailed Description
The invention discloses a triaxial seepage test box capable of being used for both axial loading and axial unloading and a use method thereof.
Referring to fig. 1 to 3, the triaxial seepage test box with dual purposes of axial loading and axial unloading comprises a measuring system, a water inlet system, a drainage system, a confining pressure control system, a sound wave processing system and a radial displacement acquisition system. The measuring system is used as the main improvement point of the invention and is explained in detail below, the measuring system comprises a lifting cover, a base, a shaft-pressing steel shaft, a sample centering disc and a support thereof, a chassis, a blocking twisting head and a long bolt thereof, the lifting cover 2 is connected with the chassis 5, is fixed by a large bolt 34, is sealed by a chassis sealing ring 9, is filled with hydraulic oil from an oil inlet hole 15, discharges redundant oil from an upper oil port 36, the oil inlet hole 15 is connected with a confining pressure control system, the confining rock control system is respectively provided with a confining pressure control meter 26 and an oil pressure meter 27 which are sequentially arranged on an oil inlet conveying line, and the oil inlet conveying line and the oil outlet conveying line are converged on an oil.
The porous disk 13 has respectively been laid to the upper and lower face of sample 4, rubber ring 12 is sheathed in to 4 whole bodies of sample, rubber ring 12 is bound tightly with ferrule 11 from top to bottom, both ends are sealed by the sealing washer, the middle part is ann has radial displacement sensor 17, evenly ann has acoustic emission probe 35 from top to bottom, it is total 8 about controlling, displacement sensor 17 and acoustic emission probe 35 output line converge in sound wave treater and radial displacement collector 37, constitute sound wave processing and radial displacement collection system, draw out axial displacement sensor lead-out wire 8 on the sample and combine the computer to carry out the displacement and carry out data acquisition to it.
The centering disc is fixed by four pillars 1, the lower ends of the pillars 1 are fixed on the chassis 5, and the upper ends are fixed in the grooves 18. The shaft pressing steel shaft 3 penetrates through the centering disc and the upper disc of the lifting cover 2, a sealing ring 14 is arranged at the outlet of the upper disc, and a blocking twisting head 6 is arranged on the shaft pressing steel shaft. As shown in fig. 2 and 3, the blocking torque head 6 is provided with a long bolt 16, and the long bolt 16 passes through the torque head 20 and is fixed in the axle-pressing steel shaft 3. The twisting head 20 is composed of a blocking twisting head beam 19 and a blocking twisting head upright post 21, and the blocking twisting head beam 19 and the blocking twisting head upright post 21 are fixed in a vertical mode and are embedded on the surface of the axle pressing steel axle 3. The top end of the shaft pressing steel shaft 3 is provided with a connecting shaft 22, the connecting shaft 22 is fixed at the top end of the shaft pressing steel shaft 3 and is provided with threads, and the connecting shaft 22 is used for connecting an axial loading system. The water inlet channel is filled with water from a water inlet 7 to the water permeable plate 13, three valves are arranged along the water inlet channel, a water pressure gauge 30, a power water pump 31, a flowmeter 32 and a final water tank 33 are sequentially arranged in the water inlet channel, and the water inlet channel forms a hydraulic system. The water outlet 10 is connected with a valve 23, the valve 23 is connected with a flowmeter 24, and finally a water bucket 25 is formed, and the water drainage channel forms a water drainage system. The computer 29 is connected with the water pressure gauge 30, the power water pump 31, the flow meter 32, the confining pressure control meter 26, the oil pressure gauge 27, the sound wave processor and radial displacement collector 37 and the flow meter 24.
The triaxial seepage experimental method capable of axially loading and axially unloading comprises the following steps:
1) carrying out triaxial seepage experiment
Step 1, installing a processed sample in a pressure chamber according to the figure 1, putting down a lifting cover, screwing a big bolt for fixing the lifting cover, and rotating a long bolt to enable a blocking torque head to be hidden in a steel shaft for shaft pressing;
step 2, injecting oil into the pressure chamber, and applying certain confining pressure after exhausting air; connecting a shaft pressure loading system by using a connecting shaft, and applying certain shaft pressure;
step 3, applying water pressure with certain pressure to the sample by using a hydraulic system, and continuously applying axial loading until the sample is damaged after the flowmeter is stabilized; a certain axial pressure can be fixed, and the water pressure is increased until the sample is damaged;
and 4, collecting data obtained by the confining pressure control system, the drainage system, the hydraulic system and the sound wave processing and radial displacement acquisition system by using a computer.
2) Carrying out axial no-load seepage experiment
Step 1, installing a processed sample in a pressure chamber according to the figure 1, putting down a lifting cover, screwing a big bolt for fixing the lifting cover, and rotating a long bolt to expose a blocking twisting head to be supported in the lifting cover;
step 2, injecting oil into the pressure chamber, and applying certain confining pressure after exhausting air;
step 3, applying water pressure to the sample by using a hydraulic system, and gradually increasing the water pressure until the sample is damaged;
and 4, collecting data obtained by the confining pressure control system, the drainage system, the hydraulic system and the sound wave processing and radial displacement acquisition system by using a computer.
It is intended that any equivalents, or obvious variations, which may be made by those skilled in the art in light of the teachings herein, be within the scope of the present invention.

Claims (3)

1. The utility model provides a dual-purpose triaxial seepage flow experiment box, its includes survey system, water inlet system, drainage system, confined pressure control system, sound wave processing system and radial displacement collection system, its characterized in that:
the measuring system comprises a sample, a lifting cover, a centering disc and a shaft pressing steel shaft, wherein the sample is positioned in the centering disc, the centering disc comprises four supporting columns, the lower end of each supporting column is fixed on a chassis, the lifting cover is positioned on the periphery of the centering disc, the lifting cover and the supporting columns share one chassis, a groove is formed in the inner side of an upper disc body of the lifting cover, the upper end of each supporting column can be fixed in the groove, the shaft pressing steel shaft sequentially penetrates through the upper disc body of the lifting cover and the centering disc and then is applied to the surface of the sample, a blocking twisting head is arranged on the shaft pressing steel shaft at the joint of the upper disc body of the lifting cover, a connecting shaft is arranged at the top of the shaft pressing steel shaft, and threads are arranged on the connecting shaft; the top surface and the bottom surface of the sample are provided with water permeable plates, the whole body of the sample is sleeved with a rubber ring, the middle part of the sample is connected with the radial displacement acquisition system, and the top surface and the bottom surface of the sample are provided with the sound wave processing system;
an oil inlet is formed in the chassis, the oil inlet is connected with the confining pressure control system, the confining pressure control system comprises a confining pressure control meter and an oil pressure meter, and the confining pressure control meter and the oil pressure meter are respectively connected to an oil inlet conveying line connected with the oil inlet;
the water inlet system is used for injecting water to the porous plate of the sample, the water inlet system is connected to the porous plate on the top surface of the sample, and the water drainage system is connected to the porous plate on the bottom surface of the sample; the blocking twisting head is a rotatable joint, a bolt is arranged on the blocking twisting head, and the bolt penetrates through the blocking twisting head and is fixed on the surface of the axial compression steel shaft; the blocking torsion head is composed of a beam and an upright post, and the beam and the upright post are fixed in a vertical mode and embedded in the surface of the axial compression steel shaft.
2. The dual-purpose triaxial seepage testing cassette of claim 1, wherein: the rubber ring is tightened by a metal hoop, and two ends of the rubber ring are sealed by sealing rings.
3. The use method of the dual-purpose triaxial seepage testing cassette of claim 1, which comprises the following steps in sequence:
1) carrying out triaxial seepage experiment
a1, placing the processed sample in a centering disc, putting down and fixing a lifting cover, and hiding a blocking torsion head in a shaft pressing steel shaft;
2, injecting oil into the centering disc, and applying a certain confining pressure through a confining pressure control system after air is exhausted; connecting a shaft pressure loading system by using a connecting shaft, and applying certain shaft pressure;
a3, stopping axial pressure loading in a2, applying water pressure with certain pressure to the sample by using a water inlet system, continuing to connect the axial pressure loading system to apply axial loading until the sample is damaged after the sample is stabilized, or fixing certain axial pressure, and increasing the water pressure until the sample is damaged;
a4, collecting data obtained by a confining pressure control system, a drainage system, a water inlet system, a sound wave processing system and a radial displacement acquisition system and carrying out conventional analysis;
2) carrying out axial no-load seepage experiment
b1, placing the processed sample in a centering disc, exposing the blocking twisting head, and supporting the blocking twisting head in a lifting cover;
b2, injecting oil into the centering disc, and applying a certain confining pressure through a confining pressure control system after air is exhausted;
b3, applying water pressure to the sample by using a water inlet system, and gradually increasing the water pressure until the sample is damaged;
b4, collecting data obtained by the confining pressure control system, the drainage system, the water inlet system, the sound wave processing system and the radial displacement acquisition system and carrying out conventional analysis.
CN201710594405.6A 2017-07-20 2017-07-20 Axial-loading and axial-unloading dual-purpose triaxial seepage experiment box and using method Active CN107300507B (en)

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CN101629891A (en) * 2009-08-12 2010-01-20 重庆大学 Fixedly coupled three-shaft servo seepage pressure chamber containing gas coal thermal flow
CN103076268A (en) * 2012-12-31 2013-05-01 河海大学 Permeability measurement device and measurement method in rock rheological process
CN103308388A (en) * 2013-05-27 2013-09-18 华侨大学 Active or passive combined acoustic testing and seepage testing combined system for rock triaxial test
CN203534910U (en) * 2013-10-15 2014-04-09 合肥工业大学 Triaxial creep testing device for stress, seepage and chemical coupling of rock
CN104833579A (en) * 2015-04-24 2015-08-12 河海大学 Test device and test method for testing strength change of soil body after occurrence of seepage deformation of dykes and dams
CN106290118A (en) * 2016-10-26 2017-01-04 中国科学院武汉岩土力学研究所 Oil in Super-low Permeability rock permeability measuring method under triaxial stress effect

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Publication number Priority date Publication date Assignee Title
SU842499A1 (en) * 1979-08-17 1981-06-30 Сибирский Научно-Исследовательскийинститут Геологии,Геофизики И Мине-Рального Сырья Device for rock permeability determination
US5159828A (en) * 1990-08-31 1992-11-03 Exxon Production Research Company Microaccumulator for measurement of fluid volume changes under pressure

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101629891A (en) * 2009-08-12 2010-01-20 重庆大学 Fixedly coupled three-shaft servo seepage pressure chamber containing gas coal thermal flow
CN103076268A (en) * 2012-12-31 2013-05-01 河海大学 Permeability measurement device and measurement method in rock rheological process
CN103308388A (en) * 2013-05-27 2013-09-18 华侨大学 Active or passive combined acoustic testing and seepage testing combined system for rock triaxial test
CN203534910U (en) * 2013-10-15 2014-04-09 合肥工业大学 Triaxial creep testing device for stress, seepage and chemical coupling of rock
CN104833579A (en) * 2015-04-24 2015-08-12 河海大学 Test device and test method for testing strength change of soil body after occurrence of seepage deformation of dykes and dams
CN106290118A (en) * 2016-10-26 2017-01-04 中国科学院武汉岩土力学研究所 Oil in Super-low Permeability rock permeability measuring method under triaxial stress effect

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