CN115656478A - Seepage-proofing shearing test device for simulating ice particle circulating shearing and using method - Google Patents
Seepage-proofing shearing test device for simulating ice particle circulating shearing and using method Download PDFInfo
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Abstract
The invention discloses an anti-seepage shear test device for simulating ice particle circulating shear and a using method thereof, and relates to the technical field of debris flow simulation tests. The device comprises a high-speed camera, a digital video camera, a data acquisition instrument, an earthquake acceleration acquisition instrument and an analog test system, wherein the analog test system comprises a driving motor and a rotary shearing disc connected with an output shaft of the driving motor, a central connecting body is fixed at the top of the rotary shearing disc, a central column body is installed on the central connecting body, a light material ring is fixed on the central column body, a weight layer is arranged on the light material ring through a guide rod sleeve, a transparent acrylic barrel is arranged on a supporting component, and a micro-hole pressure sensor and a positive stress sensor are installed on the inner wall of the transparent acrylic barrel. The invention solves the problems that the existing drag reduction mechanism understanding caused by ice-water phase change of glacier type debris flow is not thorough, the monitoring and analysis of vibration signals in the shearing process are deficient and the underwater shearing cannot be realized.
Description
Technical Field
The invention belongs to the technical field of debris flow simulation tests, and particularly relates to an anti-seepage shear test device for simulating ice particle circulating shear and a using method thereof.
Background
Glaciers are indicators of climate change and also important solid reservoirs of fresh water resources, and modern glaciers are distributed in almost all latitudes around the world. Glaciers on earth, about 2900 tens of thousands square kilometers, cover 11% of the area of the continents. Under the influence of climate change, extreme events of temperature rise rainfall in a mountain area are frequent, and a mountain ice and snow disaster chain is extremely easy to cause, wherein the extreme events relate to a complete dynamic process of iced moraine soil instability under the action of freeze-thaw cycle, landslide starting, high-speed movement and scale surge, block Jiang Cheng dams, dammed lakes and burst flood. The mountain ice and snow disaster chain sensitive to climate response has the characteristics of emergencies, influence universality and damage severity, and seriously threatens the life safety of local residents and the safety guarantee of infrastructure. When the debris flow/debris flow disaster containing ice occurs, the infrastructure such as roads, railways and the like can be flushed, rivers are blocked to form a dammed lake, and further secondary disasters are caused, even the whole village is buried, and the like, so that the life and property safety of people is seriously threatened.
Compared with field monitoring, an indoor experiment is a method with controllable experimental conditions and capable of systematically researching the influence mechanism of ice content on the superstrong movement of landslide, debris flow and debris flow, and is also the most common method for researching the 'ice water phase change drag reduction' mechanism with strongest feasibility at present. Qin Shengwu et al (patent application number: 201610177817.5) disclose a simulation test system that integrates the start, migration, and stacking of debris flows; zhang Wen et al (patent application No. 201510768066. X) disclose a simulation experiment system for debris flow movement and accumulation, which can be used for performing experiments on the influence of various factors (such as gradient, slurry viscosity and friction) on the debris flow movement and accumulation process; wu Gonggang et al (patent application number: 201710235878.7) disclose a debris flow simulation test device and a test method, which mainly solve the problem of the non-continuity of the debris flow existing in the existing debris flow simulation device; tao Zhigang et al (patent application No. 201510768066. X) disclose a debris flow physical model experiment system and a debris flow simulation assembly thereof, which can perform physical simulation of the whole debris flow process of various slope angles and fan surface scouring.
However, the above-mentioned prior art has a multi-point drawback. Firstly, the monitoring and accurate control of the ice content in the process of the super-strong motion of the high-speed remote landslide/ice rock collapse debris flow/glacier debris flow cannot be performed, and key mechanical parameters related to the ice content in the process of disaster motion cannot be extracted, so that the dynamic mechanism of the rapid increase of the debris flow scale caused by the reduction of the frictional resistance of the ice body due to the melting of the ice body in the process of the high-speed motion of a disaster body cannot be deeply analyzed, the cognition of the natural disaster of the ice-containing landslide debris flow/glacier debris flow with great destructiveness is limited, the whole process forward modeling and the scene simulation of an ice and snow disaster chain in a high mountain valley area are limited, and the accurate prediction of the ice and snow disaster is limited; secondly, key dynamic and environmental seismological parameters cannot be monitored simultaneously, and specifically, the monitoring and acquisition of vibration signals in the high-speed motion process are lacked; lack of real-time monitoring and acquisition of ice content during landslide debris flow/debris flow movement; the method is lack of a basic mechanical parameter measuring module and a synchronous seismic signal acquisition system for the debris flow/debris flow disaster movement process, so that the vibration characteristics of mechanical signals cannot be effectively analyzed from the perspective of environmental seismology, the understanding means of classical mechanical parameters is limited, and the understanding and comprehension of the ice content on the dynamics mechanism of the landslide debris flow/debris flow disaster super-strong movement process cannot be further improved. Therefore, the seepage-proofing shearing test device for simulating the circulating shearing of the ice particles and the using method are provided for solving the technical problems.
Disclosure of Invention
The invention aims to provide an anti-seepage shearing test device for simulating ice particle circulating shearing and a using method thereof, which can realize real-time dynamic monitoring on the shape, size and melting volume of ice particles in the movement process of ice-containing debris flow/ice rock collapse debris flow/glacier debris flow, can also realize shearing of completely submerged underwater particle flow/debris flow, records the difference between a mechanical parameter signal in the shearing process and a vibration signal without shearing rate, and solves the problem that the debris flow/debris flow mechanical parameter and the environmental seismic signal characteristic cannot be well utilized to pre-judge and early warn the debris flow disaster process.
In order to solve the technical problems, the invention is realized by the following technical scheme:
the invention relates to an anti-seepage shear test device for simulating ice particle circulating shear, which comprises a high-speed camera, a digital video camera, a data acquisition instrument, a supporting assembly, and a seismic acceleration acquisition instrument and a simulation test system which are arranged on the supporting assembly;
the simulation test system comprises a driving motor and a rotary shearing disc connected with an output shaft of the driving motor, the rotary shearing disc is in contact with a motor waterproof support body on a support assembly, the top of the rotary shearing disc is fixedly connected with a central connector, a central cylinder is installed on the central connector, the peripheral side surface of the central cylinder is fixedly connected with a light material ring in a coaxial manner, a weight layer is arranged on the light material ring through a guide rod sleeve, the support assembly is connected with a transparent acrylic barrel through a sealant, the rotary shearing disc, the motor waterproof support body, the light material ring and the weight layer are all arranged in the transparent acrylic barrel in a coaxial manner, and a micro-hole pressure sensor and a positive stress sensor are installed on the inner wall of the transparent acrylic barrel;
the high-speed camera is used for capturing the motion speed and motion trail of ice particles and solid particle substances in real time in the shearing process; the digital camera is used for providing video image data of the whole shearing process as a reference basis for post-processing analysis; the data acquisition instrument is used for providing multi-channel data synchronous acquisition; the earthquake acceleration acquisition instrument is used for providing vibration signals of the annular shearing device and dynamically monitoring the vibration signal difference caused by ice body melting in real time; the pore space between the rotary shearing disc and the waterproof support body of the motor is impervious through an oil seal; the weight layer sets up different top pressure through adjusting its thickness.
As a preferred technical scheme of the invention, the multichannel data synchronously acquired by the data acquisition instrument comprise normal stress and pore water pressure.
As a preferred technical scheme of the invention, two micro pore pressure sensors are arranged at the same position on the inner wall of the transparent acrylic barrel, and sensing signals of the micro pore pressure sensors are dynamically acquired in real time by a data acquisition instrument.
As a preferred technical scheme, two normal stress sensors are arranged at the same position on the inner wall of the transparent acrylic barrel and used for dynamically measuring the side wall pressure in the rotary shearing process in real time, and sensing signals of the normal stress sensors are dynamically acquired in real time by a data acquisition instrument.
As a preferred technical scheme of the invention, the supporting assembly comprises a bottom supporting platform arranged on a high-strength desktop, a middle supporting platform is fixedly connected to the bottom supporting platform through a through screw, the seismic acceleration acquisition instrument and a motor waterproof supporting body are arranged at the top of the middle supporting platform, the driving motor is arranged at the bottom of the middle supporting platform, a top fixing platform connected through a fixing screw is sleeved on the through screw, and the top fixing platform is used for sealing the top of the transparent acrylic barrel.
The use method of the seepage-proofing shear test device for simulating ice particle circulating shear comprises the following steps:
s1, opening a high-speed camera, a digital video camera, a data acquisition instrument and an earthquake acceleration acquisition instrument, adjusting to a synchronous state, and preparing to start test calibration;
s2, respectively carrying out static calibration and dynamic calibration on the micro pore pressure sensor and the normal stress sensor, and specifically comprising the following steps:
s21, statically calibrating the micro pore pressure sensor by utilizing pressures generated by static water heads with different heights, finding out the corresponding relation between pore water pressure and a voltage signal, and carrying out static calibration on the normal stress sensor by the same calibration method, wherein mutual verification is carried out between the normal stress sensor and the micro pore pressure sensor;
s22, after the static calibration is finished, installing the micro hole pressure sensor, the normal stress sensor and the seismic sensor at the designated positions of the water tank on the inner wall of the transparent acrylic barrel, and starting to perform dynamic calibration;
s3, filling solid particles and ice particles for testing into a transparent acrylic barrel according to a certain proportion, adjusting the thickness of a weight layer to a required pressure, fixing the whole experimental device through a fixing screw, knocking a high-strength desktop through an experimental rubber hammer, observing the response conditions of a mechanical sensor and a seismic sensor, and starting the test after the test of each sensor is finished;
and S4, the acquisition system is opened in advance and acquires a section of data to calibrate an initial value, then the driving motor with adjustable rotating speed is opened, the rotating speed is adjusted to a specified interval range, the high-strength tabletop is knocked by the rubber hammer for three times to start the test, and when the ice particles in the transparent acrylic barrel are completely melted, the high-strength tabletop is knocked by the rubber hammer for three times to finish the test.
After the experiment is finished, cleaning the test residues in the transparent acrylic bucket, supplementing butter for oil sealing again, and gluing again for preventing seepage for the gap at the bottom of the transparent acrylic bucket.
The invention has the following beneficial effects:
1. the annular anti-seepage shearing experimental device and the method for simulating ice particle circulating shearing have reasonable conception, consider the influence of the volume change of ice particles in the shearing process on the fluid property in the shearing process, add an anti-seepage design specially aiming at the device after the ice particles are melted, install a seismic sensor to realize the real-time dynamic monitoring of differential vibration signals in the shearing process, can measure most of the kinetic, environmental seismology and imaging parameters in the particle flow/debris flow shearing process, are beneficial to analyzing the mechanical mechanism in the debris flow disaster forming process in a multi-angle and multi-dimension manner, deepen disaster understanding, and mainly solve the problems that the understanding of the drag reduction mechanism caused by ice-containing debris flow ice water phase change is not thorough, the monitoring and analysis of the vibration signals in the shearing process is deficient, and the underwater shearing cannot be realized at present.
2. The invention adopts a high-speed camera to shoot a continuous high-frequency image sequence in the shearing process, can be used for analyzing a particle velocity field in the depth direction and monitoring the change of the shape/volume of ice particles in the shearing process, adopts a synchronous data acquisition system to acquire through high-speed analog quantity and continuously sample in real time, has multiple channels, can simultaneously meet the synchronous acquisition of signals of a plurality of micro pore pressure sensors and positive stress sensors, can synchronously trigger the high-speed camera, and is convenient for synchronously comparing the image signals in the ice-containing debris flow/debris flow movement process with the data signals of other types of sensors.
Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an impervious shear test device for simulating ice particle circulating shear.
FIG. 2 is a water-proof design drawing in the seepage-proofing shear test device of the invention.
In the drawings, the components represented by the respective reference numerals are listed below:
1-high-speed camera, 2-digital video camera, 3-data acquisition instrument, 4-support component, 41-bottom support platform, 42-penetrating screw, 43-middle support platform, 44-fixing screw, 45-top fixing platform, 5-earthquake acceleration acquisition instrument, 6-driving motor, 7-rotary shearing disc, 8-motor waterproof support body, 9-central connector, 10-central column, 11-light material ring, 12-weight layer, 13-transparent acrylic barrel, 14-micro hole pressure sensor, 15-positive stress sensor, 16-high-strength desktop.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Example one
Referring to fig. 1-2, the invention is an anti-seepage shear test device for simulating ice particle circulating shear, comprising a high-speed camera 1, a digital video camera 2, a data acquisition instrument 3, a support component 4, and a seismic acceleration acquisition instrument 5 and a simulation test system which are arranged on the support component;
the simulation test system comprises a driving motor 6 and a rotary shearing disc 7 connected with an output shaft of the driving motor 6, the rotating speed of the driving motor 6 is adjustable (0-200 r/min,10 gears are adjustable), a fixed shearing rate can be provided to be set as an independent variable of an experiment, the bottom of the rotary shearing disc 7 (capable of setting roughness) is in contact with a motor waterproof support body 8 (a plane bearing) on a support component 4, internal pores are filled with butter, effective oil sealing can be performed, internal liquid leakage is prevented, the top of the rotary shearing disc 7 is fixedly connected with a central connector 9, a central cylinder 10 is installed on the central connector 9, the whole device is in an axial position during rotary shearing to prevent eccentricity from causing large vibration, the peripheral side of the central cylinder 10 is fixedly connected with a light material ring 11 in a coaxial manner, a top light material layer used for setting roughness of the light material ring 11 is used for setting roughness, influences caused by different top roughnesses in a shearing process are prevented, a weight layer 12 is arranged on the light material ring 11 through a guide rod sleeve, the weight layer 12 is used for setting different top pressures, the upper portion of the light material layer is adjustable, a transparent sealing glue is connected with a transparent support body 7 on the support component 4, a transparent acrylic sealant 13, a transparent acrylic pressure sensor 13, and a transparent acrylic pressure sensor 13 are arranged on the transparent acrylic pressure barrel 13, and a transparent acrylic pressure sensor 13;
the high-speed camera 1 is used for capturing the motion speed and motion trajectory of ice particles and solid Particle substances in real time in the shearing process (Particle Image Velocimetry, PIV) based on a network Particle Image Velocimetry technology; the digital camera 2 is used for providing video image data of the whole shearing process as a reference basis for post-processing analysis; the data acquisition instrument 3 is used for providing multi-channel (maximum 24 channels) data synchronous acquisition, including positive stress and pore water pressure; the earthquake acceleration acquisition instrument 5 is used for providing vibration signals of the annular shearing device and dynamically monitoring the vibration signal difference caused by ice melting in real time; the pore space between the rotary shearing disc 7 and the motor waterproof supporting body 8 is impervious through an oil seal; the weight layer 12 sets different top pressures by adjusting its thickness.
In this embodiment, two micro pore pressure sensors 14 are arranged at the same position on the inner wall of the transparent acrylic barrel 13, the sensing signal of the micro pore pressure sensor 14 is dynamically acquired by the data acquisition instrument 3 in real time, and the diameter of the micro pore pressure sensor 14 is set to be 5 mm.
In the embodiment, two normal stress sensors 15 are arranged at the same position on the inner wall of the transparent acrylic barrel 13 and used for dynamically measuring the side wall pressure in the rotary shearing process in real time, and sensing signals of the normal stress sensors 15 are dynamically acquired by the data acquisition instrument 3 in real time; the transparent acrylic material of the transparent acrylic barrel 13 is wear-resistant and smooth, and can ensure that the high-speed camera 1 and the digital camera 2 can smoothly capture the ice melting and inter-particle interaction process in the shearing process.
In this embodiment, supporting component 4 is including installing bottom sprag platform 41 on high strength desktop 16, bottom sprag platform 41 is gone up and is fixed with middle part supporting platform 43 through running through screw rod 42 connection, middle part supporting platform 43 can provide seismic acceleration sensor 5's installation and vibration monitoring platform, seismic acceleration gathers appearance 5 and motor waterproof support body 8 and installs at this middle part supporting platform 43 top, driving motor 6 installs in this middle part supporting platform 43 bottom, it is equipped with top fixed platform 45 through fixed screw 44 connection to run through the cover on the screw rod 42, this top fixed platform 45 is used for the sealed at transparent ya keli bucket 13 top.
The annular seepage-proofing shearing test device for simulating the ice particle circulating shearing mainly breaks through the technical barrier that the size, the shape and the ice content of ice particles cannot be monitored dynamically in real time in the current ice-containing debris flow/ice rock caving debris flow/glacier debris flow simulation process, overcomes the defect that the underwater shearing cannot be considered due to bottom leakage in the traditional annular shearing test, and realizes the great breakthrough of expanding the shearing material from the traditional dry particles to the underwater saturated material. The device can measure the whole process of the traditional dynamic parameters in the shearing process of the landslide debris flow/(saturated) glacier debris flow, such as the synchronous measurement of flow velocity distribution, pore water pressure, normal stress, shearing stress and effective stress in the shearing motion process; meanwhile, the seismic acceleration acquisition instrument 5 can effectively capture vibration signals in the debris flow shearing motion process, further analyze vibration difference caused by ice particle melting, realize the synchronous monitoring of important dynamic basic parameters and environmental seismic signals in the high-speed remote landslide-debris flow/debris flow superstrong motion process, organically combine two subjects of modern environmental seismology and traditional debris flow dynamics, lead the traditional disaster field to the field of modern environmental seismology, and widen the research visual field. Through the comparison and combination analysis of the two signals, the advanced early warning of the ice-containing debris flow disaster can be expected to be realized, the understanding of an ice-water phase change dynamics mechanism in the process of the collapse flood debris flow movement can be deepened, and the understanding of the whole service life process of the ice and snow mountain disaster chain is deepened.
Example two
The invention is used for simulating an ice-containing debris flow/debris flow (underwater) annular shearing process, and specifically comprises the following steps:
(1) Experimental apparatus arrangement
According to the sequence of the attached drawing 1, all components of the experimental device are installed, the gaps around the transparent acrylic bucket 13 are subjected to seepage prevention treatment by using glass cement, and the seepage prevention design between the motor waterproof supporting body 8 and the rotary shearing disc 7 in the attached drawing 2 is subjected to oil seal seepage prevention. Preparing solid particle materials, ice particle materials and clear water for standby, opening acquisition equipment, seismic signal monitoring equipment and image acquisition equipment, adjusting the acquisition equipment, the seismic signal monitoring equipment and the image acquisition equipment to be in a synchronous state, and preparing to start experimental calibration.
(2) Calibration sensor
Before the experiment, each sensor should be calibrated statically and dynamically. In the static calibration, the pressure generated by static water heads with different heights is used for calibrating the micro pore pressure sensor 14, and the corresponding relation between the pore water pressure and the voltage signal is found; meanwhile, the normal stress sensor 15 can be calibrated by water heads with different heights, and mutual verification is carried out between the normal stress sensor 15 and the micro pore pressure sensor 14; the micro pore pressure sensor 14 needs a vacuum pump to evacuate air in the permeable stone, and then quickly soak the permeable stone into water, so that water is sucked back to saturate the permeable stone, and the purpose of removing air in the permeable stone is achieved. After repeating this operation several tens of times, the calibration of the micro pore pressure sensor 14 in the normal flow may be started, as described above. After the static calibration is completed, all sensors are installed at the designated positions of the water tank, and dynamic calibration is performed on the seismic sensors (which can only be dynamically calibrated) which are not calibrated. The dynamic calibration is to use a fixed shear rate (fixed rotation speed) to carry out the cyclic shearing of the particle material, open all the acquisition and monitoring devices, convert the actual normal stress and the pore water pressure through the result of the static calibration, and carry out mutual verification and estimation error. The vibration signal collected by the earth-sound equipment can be used as a basic environment noise signal for contrastively analyzing the debris flow vibration signal.
(3) Preparation of the experiment
Solid particles and ice particles for experiments are loaded into the transparent acrylic barrel 13 according to a certain proportion, the thickness of the weight layer 12 is adjusted to the required pressure, and the whole experimental device is fixed through the fixing screws 44. And knocking the table top by using an experimental rubber hammer, observing the response conditions of the mechanical sensor and the seismic sensor, and starting an experiment after all the sensors are tested.
(4) Procedure of experiment
When the experiment starts, the acquisition system is opened in advance and acquires a section of data to calibrate an initial value; and then, turning on the driving motor 6 with adjustable rotating speed, adjusting the rotating speed to a specified interval range, knocking the high-strength tabletop 16 for three times by using a rubber hammer, and marking the formal start of an experiment. Then, the experiment operator stands still in place to prevent additional vibration signal interference; waiting for the ice particles in the transparent acrylic barrel 13 as the shearing barrel to completely melt, then knocking the high-strength tabletop 16 times by the experimenter with a rubber hammer, marking the end of the experiment, and closing the three sets of collecting equipment.
(5) Cleaning up experiments
After the experiment is finished, the experiment materials accumulated in the barrel need to be cleaned, after the equipment is stopped stably, the fixing screw 44 at the top is taken down, the top fixing platform 45 is lifted, and the experiment residues in the transparent acrylic barrel 13 are cleaned; grease sealing is carried out again on gaps in the waterproof design, gluing is carried out again on the gaps at the bottom of the transparent acrylic barrel 13, and seepage-proofing reinforcement is carried out; after the experimental device is dried, the next set of experiment can be carried out.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (7)
1. The utility model provides a simulation ice particle circulation shearing's prevention of seepage shear test device which characterized in that: the earthquake simulation test system comprises a high-speed camera, a digital video camera, a data acquisition instrument, a supporting assembly, and an earthquake acceleration acquisition instrument and a simulation test system which are arranged on the supporting assembly;
the simulation test system comprises a driving motor and a rotary shearing disc connected with an output shaft of the driving motor, the rotary shearing disc is in contact with a motor waterproof support body on a support assembly, the top of the rotary shearing disc is fixedly connected with a central connector, a central cylinder is installed on the central connector, the peripheral side surface of the central cylinder is fixedly connected with a light material ring in a coaxial manner, a weight layer is arranged on the light material ring through a guide rod sleeve, the support assembly is connected with a transparent acrylic bucket through sealant, the rotary shearing disc, the motor waterproof support body, the light material ring and the weight layer are all arranged inside the transparent acrylic bucket in a coaxial manner, and a micro-hole pressure sensor and a positive stress sensor are installed on the inner wall of the transparent acrylic bucket;
the high-speed camera is used for capturing the motion speed and motion track of ice particles and solid particle substances in real time in the shearing process; the digital camera is used for providing video image data of the whole shearing process and serving as a reference basis for post-processing analysis; the data acquisition instrument is used for providing multi-channel data synchronous acquisition; the earthquake acceleration acquisition instrument is used for providing vibration signals of the annular shearing device and dynamically monitoring the vibration signal difference caused by ice body melting in real time; the pore space between the rotary shearing disc and the waterproof support body of the motor is impervious through an oil seal; the weight layer sets up different top pressure through adjusting its thickness.
2. The apparatus of claim 1, wherein the data acquisition instrument synchronously acquires multi-channel data including normal stress and pore water pressure.
3. The device for simulating the seepage-proofing shearing test of the ice particles in the circulating shearing process according to claim 1, wherein two micro pore pressure sensors are arranged at the same position on the inner wall of the transparent acrylic bucket, and sensing signals of the micro pore pressure sensors are dynamically acquired by a data acquisition instrument in real time.
4. The seepage-proofing shearing test device for simulating ice particle circulating shearing according to claim 1, wherein two normal stress sensors are arranged at the same position on the inner wall of the transparent acrylic barrel and used for dynamically measuring the side wall pressure in the rotating shearing process in real time, and sensing signals of the normal stress sensors are dynamically acquired by a data acquisition instrument in real time.
5. The device for simulating ice particle circulating shear seepage-proofing shear test of claim 1, wherein the supporting component comprises a bottom supporting platform installed on a high-strength desktop, a middle supporting platform is fixedly connected to the bottom supporting platform through a through screw, the seismic acceleration acquisition instrument and a motor waterproof supporting body are installed at the top of the middle supporting platform, the driving motor is installed at the bottom of the middle supporting platform, a top fixing platform connected through a fixing screw is sleeved on the through screw, and the top fixing platform is used for sealing the top of the transparent acrylic barrel.
6. The use method of the seepage-proofing shearing test device for simulating ice particle circulating shearing is characterized by comprising the following steps of:
s1, opening a high-speed camera, a digital video camera, a data acquisition instrument and an earthquake acceleration acquisition instrument, adjusting the high-speed camera, the digital video camera, the data acquisition instrument and the earthquake acceleration acquisition instrument to a synchronous state, and preparing to start test calibration;
s2, respectively carrying out static calibration and dynamic calibration on the micro pore pressure sensor and the normal stress sensor, and specifically comprising the following steps:
s21, statically calibrating the micro pore pressure sensor by utilizing pressures generated by static water heads with different heights, finding out the corresponding relation between pore water pressure and a voltage signal, and carrying out static calibration on the normal stress sensor by the same calibration method, wherein mutual verification is carried out between the normal stress sensor and the micro pore pressure sensor;
s22, after the static calibration is finished, installing the micro hole pressure sensor, the normal stress sensor and the seismic sensor at the designated positions of the water tank on the inner wall of the transparent acrylic barrel, and starting to perform dynamic calibration;
s3, filling solid particles and ice particles for testing into a transparent acrylic barrel according to a certain proportion, adjusting the thickness of a weight layer to a required pressure, fixing the whole experimental device through a fixing screw, knocking a high-strength desktop by an experimental rubber hammer, observing the response conditions of a mechanical sensor and a seismic sensor, and starting the test after the testing of each sensor is finished;
and S4, the acquisition system is opened in advance and acquires a section of data to calibrate an initial value, then the driving motor with adjustable rotating speed is opened, the rotating speed is adjusted to a specified interval range, the high-strength tabletop is knocked by the rubber hammer for three times to start the test, and when the ice particles in the transparent acrylic barrel are completely melted, the high-strength tabletop is knocked by the rubber hammer for three times to finish the test.
7. The use method of the seepage-proofing shear test device for simulating ice particle circulating shear according to claim 6, characterized by further comprising the step S5:
after the experiment is finished, cleaning the test residues in the transparent acrylic bucket, supplementing butter for oil sealing again, and gluing again for preventing seepage for the gap at the bottom of the transparent acrylic bucket.
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