CN117250219A - Rock freeze-thawing cycle test equipment and method for monitoring frost heaving pressure and freeze-thawing damage - Google Patents
Rock freeze-thawing cycle test equipment and method for monitoring frost heaving pressure and freeze-thawing damage Download PDFInfo
- Publication number
- CN117250219A CN117250219A CN202311046904.3A CN202311046904A CN117250219A CN 117250219 A CN117250219 A CN 117250219A CN 202311046904 A CN202311046904 A CN 202311046904A CN 117250219 A CN117250219 A CN 117250219A
- Authority
- CN
- China
- Prior art keywords
- freeze
- thawing
- rock
- damage
- pressure
- 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.)
- Pending
Links
- 238000010257 thawing Methods 0.000 title claims abstract description 221
- 239000011435 rock Substances 0.000 title claims abstract description 141
- 238000012544 monitoring process Methods 0.000 title claims abstract description 53
- 238000012360 testing method Methods 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 117
- 230000000007 visual effect Effects 0.000 claims abstract description 40
- 238000004458 analytical method Methods 0.000 claims abstract description 36
- 238000001514 detection method Methods 0.000 claims abstract description 27
- 230000008569 process Effects 0.000 claims abstract description 15
- 238000012351 Integrated analysis Methods 0.000 claims abstract description 5
- 238000010998 test method Methods 0.000 claims abstract description 5
- 230000001502 supplementing effect Effects 0.000 claims abstract description 3
- 238000007710 freezing Methods 0.000 claims description 47
- 230000008014 freezing Effects 0.000 claims description 39
- 238000001035 drying Methods 0.000 claims description 34
- 238000007405 data analysis Methods 0.000 claims description 21
- 230000005540 biological transmission Effects 0.000 claims description 20
- 238000010438 heat treatment Methods 0.000 claims description 20
- 229910001220 stainless steel Inorganic materials 0.000 claims description 19
- 239000010935 stainless steel Substances 0.000 claims description 19
- 238000005303 weighing Methods 0.000 claims description 18
- 238000007789 sealing Methods 0.000 claims description 16
- 238000003860 storage Methods 0.000 claims description 15
- 238000005192 partition Methods 0.000 claims description 9
- 229920006395 saturated elastomer Polymers 0.000 claims description 8
- 239000011521 glass Substances 0.000 claims description 7
- 239000008236 heating water Substances 0.000 claims description 3
- 239000011810 insulating material Substances 0.000 claims description 3
- 238000005057 refrigeration Methods 0.000 claims 2
- 238000004801 process automation Methods 0.000 abstract description 2
- 230000006872 improvement Effects 0.000 description 6
- 230000009471 action Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004445 quantitative analysis Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000001932 seasonal effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/0028—Force sensors associated with force applying means
-
- 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
- G01N15/088—Investigating volume, surface area, size or distribution of pores; Porosimetry
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A10/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE at coastal zones; at river basins
- Y02A10/23—Dune restoration or creation; Cliff stabilisation
Landscapes
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Dispersion Chemistry (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses rock freeze-thawing cycle test equipment for monitoring frost heaving pressure and freeze-thawing damage, which comprises the following components: the total control analysis system is used for controlling the whole freeze thawing test process and carrying out integrated analysis on all data; the visual freeze thawing environment box body is used for performing freeze thawing cycle treatment on the placed rock sample; the ice-containing crack frost heaving pressure monitoring system is used for monitoring the frost heaving pressure of the ice-containing crack in the freeze thawing process in real time; the temperature acquisition system is used for acquiring temperature signals of all positions of the box body in the visual freeze thawing environment in the freeze thawing process in real time; the rock damage detection system is used for transmitting the series of quality data to the total control analysis system to quantitatively analyze the freeze-thawing damage degree of the sample; the water level control system is used for controlling the water supplementing and backwater levels in the box body in the visual freeze thawing environment; the invention also discloses a rock freeze-thawing cycle test method for monitoring the frost heaving pressure and the freeze-thawing damage, which is simple in operation and full-process automation, and can monitor the frost heaving pressure of the ice-containing crack in real time and quantitatively evaluate the freeze-thawing damage.
Description
Technical Field
The invention relates to the technical field of geotechnical mechanics, in particular to rock freeze-thawing cycle test equipment and method for monitoring frost heaving pressure and freeze-thawing damage.
Background
The problem of freeze thawing disasters of rock engineering is particularly remarkable in alpine regions due to the extremely large day and night temperature difference and season temperature difference. Under the action of day and night or seasonal freeze thawing circulation, the water ice phase change and water migration phenomena in the engineering rock mass frequently and alternately occur, so that the physical and mechanical properties of the engineering rock mass are obviously deteriorated, the freeze thawing and the denudation, the slumping and even the landslide of the rock slope are extremely easy to be induced, and the safety and the stability of the rock engineering in the alpine region are greatly threatened. Therefore, development of a freeze-thawing test device and a method capable of automatically and quantitatively evaluating the freeze-thawing damage degree of rock has important significance.
Under the action of freeze thawing circulation, water-saturated cracks in the engineering rock mass can undergo the repeated action of frost heaving force of 'sprouting-developing-dissipating', so that the cracks in the rock mass are gradually expanded and penetrated. The frost heaving pressure is a core driving force for frost heaving cracking and frost thawing damage of a rock mass, however, the magnitude of the frost heaving force in the crack and an evolution mechanism thereof are controversial, and an effective test method is not yet available. Therefore, it is important to develop a test device and a method capable of precisely measuring ice crack frost heaving pressure in real time.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide rock freeze-thawing cycle test equipment and method for monitoring freeze-swelling pressure and freeze-thawing damage.
In order to achieve the above purpose, the invention adopts the following technical scheme: the rock freeze-thawing cycle test equipment for monitoring freeze-thawing pressure and freeze-thawing damage comprises a total control analysis system, a visual freeze-thawing environment box body, an ice-containing crack freeze-thawing pressure monitoring system, a temperature acquisition system, a rock damage detection system and a water level control system, wherein the total control analysis system is used for controlling the whole freeze-thawing test process and carrying out integrated analysis on all data; the visual freeze thawing environment box comprises a stainless steel box body, a stainless steel sample rack arranged in the stainless steel box body, a double-layer heat-insulating glass cover plate arranged at the top of the stainless steel box body and a heating and refrigerating assembly arranged at the bottom of the stainless steel box body, and is used for carrying out freeze thawing cycle treatment on a placed rock sample; the ice crack-containing frost heaving pressure monitoring system monitors the frost heaving pressure of the ice crack in the freeze thawing process in real time through a distributed film pressure sensor arranged in the box body of the visual freeze thawing environment; the temperature acquisition system acquires temperature signals of all positions of the visual freeze thawing environment box body in the freeze thawing process in real time through a temperature sensor arranged in the visual freeze thawing environment box body; the rock damage detection system transmits the series of quality data to the total control analysis system through the weighing instrument to quantitatively analyze the freeze-thawing damage degree of the sample; the water level control system comprises a water storage chamber and a water level sensor arranged in the water storage chamber and is used for controlling water supplementing and water returning levels in the box body in the visual freeze thawing environment.
As a further improvement of the invention, the total control analysis system comprises a parameter control module, a pressure data analysis module, a temperature curve display module, a damage data analysis module and a water level control module; wherein:
the parameter control module is used for presetting freeze-thawing cycle related parameters, is connected with a power supply control end of the heating and refrigerating assembly and controls the heating and refrigerating assembly to work;
the pressure data analysis module is connected with a signal output port of the ice-containing crack frost heaving pressure monitoring system and is used for displaying an evolution curve of the ice-containing crack frost heaving pressure along with time in real time;
the temperature curve display module is connected with a port of the temperature acquisition system and is used for displaying the temperature curve of each control point in the box body in the visual freeze thawing environment in real time;
the damage data analysis module is connected with a signal output port of a weighing instrument in the rock damage detection system and is used for collecting the drying mass m of a rock sample dry And saturated water mass m sat Based on the porosity n, the mass loss rate M and the damage variable S of the rock sample are automatically calculated;
the water level control module is connected with a control port of the water level control system, when the water level control module is switched to a gas-freezing water thawing mode, the water level control system is in an open state, namely water in the water storage chamber can be pumped into the box body of the visual freezing and thawing environment after being heated in the thawing process, otherwise, when the water level control module is switched to the gas-freezing gas thawing mode, the water level control system is in a closed state, so that the two freezing and thawing modes of gas-freezing water thawing or gas-freezing gas thawing are set according to requirements.
As a further improvement of the present invention, the porosity n is calculated as follows:
wherein m is sat Is saturated rock mass, m dry To dry rock mass ρ w Is the density of water, V is the volume of the rock sample;
calculation of the mass loss rate M is characterized by the dry mass of the sample:
wherein m is 1 For drying mass of rock sample before freeze-thawing cycle, m 2 The mass of the dried rock sample after freeze-thawing cycle;
freeze-thaw damage variable S characterized based on sample porosity n:
wherein S is i The damage variable of the rock sample after i freeze thawing cycles; n is n i And n 0 The porosity of the rock sample after i freeze-thaw cycles and the porosity of the rock sample that has not undergone a freeze-thaw cycle, respectively.
As a further improvement of the invention, the stainless steel sample rack is divided into an upper layer, a middle layer and a lower layer, is arranged in the middle of a box body in a visual freezing and thawing environment, and consists of upright posts and partition plates, wherein the partition plates are hollow partition plates so as to facilitate water circulation in a freezing and thawing mode.
As a further improvement of the invention, the heating and refrigerating assembly consists of a heater and a refrigerating compressor, wherein the heater is used for heating water in the water storage chamber to reach a specified water melting temperature, and the refrigerating compressor is used for reducing the temperature in the freezing and thawing chamber to a specified freezing temperature; the heating and refrigerating assembly is connected with a parameter control module of the total control analysis system, and the heating machine and the refrigerating compressor are controlled to work according to the set freeze-thawing cycle related parameters.
As a further improvement of the invention, the distributed film pressure is positioned in a sealing bag and is arranged on the surface of a rock sample to be tested, the sealing bag is adhered to the surface of a crack of the rock sample, a pressure signal received by an induction area is converted into an electric signal and is transmitted to an ice-containing crack frost heave pressure monitoring system through a Dupont line, and a waterproof heat insulation material is arranged at the bottom of the crack of the rock sample.
As a further improvement of the invention, the rock damage detection system comprises a drying chamber and a saturation chamber; the drying chamber comprises a transmission crawler belt and a weighing instrument, wherein the transmission crawler belt is used for conveying the rock sample subjected to the freeze-thawing cycle for the designated times from the freeze-thawing chamber to the drying chamber of the damage detection system, and the weighing instrument is used for weighing the mass of the freeze-thawing sample dried in the drying chamber in real time; the water saturation chamber comprises a transmission crawler belt and a water saturation region, wherein the transmission crawler belt is used for conveying the dried rock samples from the drying chamber to the water saturation chamber, and the water saturation region is used for carrying out water saturation treatment according to specifications after the freeze-thawing rock samples with different freeze-thawing cycle times are dried.
The invention also provides a rock freeze-thawing cycle test method for monitoring the frost heaving pressure and the freeze-thawing damage, which is characterized in that rock freeze-thawing cycle test equipment for monitoring the frost heaving pressure and the freeze-thawing damage is adopted; the method comprises the following steps:
(1) setting relevant parameters of freeze thawing cycle and whether to monitor frost heaving pressure of the ice-containing crack and detect freeze thawing damage on an operating system;
(2) placing a sample to be tested on a sample rack of a freeze thawing chamber;
(3) if the frost heaving pressure of the crack containing ice is to be monitored, installing a distributed film pressure sensor on the surface of a sample to be tested before the start of a freeze thawing cycle test;
(4) if freeze thawing damage detection is required, placing the sample on a transmission track;
(5) and carrying out a freeze-thawing cycle test of the rock, monitoring ice-containing crack frost heaving pressure and detecting freeze-thawing damage according to a set freeze-thawing cycle test scheme.
The beneficial effects of the invention are as follows:
the invention has the characteristics of simple equipment structure, full-process automation, low operation difficulty, reliable detection result and strong practicability, can monitor the frost heaving pressure evolution process in the rock containing the ice cracks accurately in real time, quantitatively characterizes the rock freeze thawing damage by double parameters, and provides effective data support for the research of rock freeze thawing degradation.
Drawings
FIG. 1 is a schematic perspective view of experimental equipment in an embodiment of the invention;
FIG. 2 is a front view of the experimental setup in an embodiment of the invention;
FIG. 3 is a top view of an experimental setup in an embodiment of the invention;
FIG. 4 is a schematic diagram of monitoring frost heaving pressure of an ice-containing crack according to an embodiment of the present invention.
Reference numerals:
1. the system comprises a total control analysis system, a visual freeze thawing environment box body, a visual freeze thawing environment 3, an ice-containing crack frost heave pressure monitoring system, a temperature acquisition system, a rock damage detection system, a water level control system, a stainless steel sample rack, a heating and refrigerating assembly, a double-layer heat-insulating glass cover plate, a distributed film pressure sensor, a temperature sensor, a drying chamber, a water saturation chamber, a weighing instrument, a transmission crawler, a water saturation region, a water level sensor, a water storage chamber, a sealing bag, a rock sample, a water level control system, a stainless steel sample rack, a water-proof and heat-insulating material, a water-proof and heat-insulating glass cover plate, a water-proof and heat-proof material.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Example 1
1-4, a rock freeze-thawing cycle test device for monitoring freeze-thaw stress and freeze-thawing damage comprises a total control analysis system 1, a visual freeze-thawing environment box body 2, an ice-crack-containing freeze-swell stress monitoring system 3, a temperature acquisition system 4 and a rock damage detection system 5, wherein the total control analysis system 1 is positioned at the upper left position of the whole test device, and the system controls the whole freeze-thawing test process and performs integrated analysis on all data; the visual freeze thawing environment box body 2 is positioned at the center of the test equipment and comprises a stainless steel box body, a stainless steel sample frame 7, a heating and refrigerating assembly 8 and a double-layer heat-insulating glass cover plate 9, and is used for performing freeze thawing cycle treatment on a placed rock sample; the frost heaving pressure monitoring system 3 containing ice cracks is positioned at the bottom of the total control analysis system 1, and the frost heaving pressure of the ice cracks in the freezing and thawing process is monitored in real time by means of the distributed film pressure sensor 10 arranged in the visible freezing and thawing environment box body 2; the temperature acquisition system 4 is positioned at the bottom of the ice-containing crack frost heaving pressure monitoring system 3, and temperature signals of the various parts of the box body in the freezing and thawing process can be acquired in real time by means of temperature sensors 11 arranged in the box body 2; the rock damage detection system 5 is positioned on the right side of the visual freeze thawing environment box body 2, and transmits series of quality data to the total control analysis system 1 through the weighing instrument 14 to quantitatively analyze the freeze thawing damage degree of the sample.
The total control analysis system 1 is a core part of test equipment and is used for controlling the progress of the whole freezing and thawing test and data integration in the test process, and comprises a parameter control module, a pressure data analysis module, a temperature curve display module, a damage data analysis module and a water level control module, wherein the parameter control module is used for presetting freeze thawing mode, freezing temperature, freezing speed, freezing time, thawing temperature, thawing speed, thawing time, freezing and thawing cycle times and the like which are related to freeze thawing circulation parameters, is connected with a power supply control end of the heating and refrigerating assembly 8 and is used for controlling the operation of the heating and refrigerating assembly 8; the pressure data analysis module is connected with a signal output port of the ice-containing crack frost heave pressure monitoring system 3 and is used for displaying an evolution curve of the ice-containing crack frost heave pressure along with time in real time; temperature curve display module and temperature acquisitionThe port of the system 4 is connected and used for displaying the temperature curve of each control point in the visible freeze thawing environment box body 2 in real time; the damage data analysis module is connected with a signal output port of a weighing instrument 14 in the rock damage detection system 5 and is used for collecting the drying mass m of a rock sample dry And saturated water mass m sat Based on the porosity n, the mass loss rate M and the damage variable S of the rock sample are automatically calculated; the water level control module is connected with a control port of the water level control system 6, when the water level control module is switched to a gas-frozen water thawing mode, the water level control system 6 is in an open state, namely water in the water storage chamber 18 is pumped into the visual freezing and thawing environment box body 2 after being heated in the thawing process, otherwise, when the water level control module is switched to the gas-frozen gas thawing mode, the water level control system 6 is in a closed state, so that two freezing and thawing modes of gas-frozen water thawing or gas-frozen gas thawing can be set according to requirements; if the measurement of ice-containing crack frost heave pressure and freeze thawing damage is not needed in the freeze thawing cycle process, the pressure data analysis module and the damage data analysis module in the total control analysis system 1 can be directly closed.
The water level control system is positioned at the bottom of the visual freeze thawing environment box body 2 and comprises a water level sensor 17 and a water storage chamber 18, a system control port is connected with a water level control module of the total control analysis system 1, and the water level control system 6 is controlled according to a set freeze thawing mode so as to control the water replenishing and backwater water level in the visual freeze thawing environment box body.
The stainless steel sample frame 7 is divided into an upper layer, a middle layer and a lower layer, is placed in the middle of a box body in a visual freezing and thawing environment, and consists of upright posts and partition plates, wherein the partition plates are hollow partition plates so as to facilitate water circulation in a freezing and thawing mode.
The heating and refrigerating assembly 8 consists of a heater and a refrigerating compressor, wherein the heater is used for heating water in the water storage chamber 18 to reach a specified water melting temperature, and the refrigerating compressor is used for reducing the temperature in the freezing and thawing chamber to a specified freezing temperature; the heating and refrigerating assembly 8 is connected with a parameter control module of the total control analysis system 1, and controls the operation of the heater and the refrigerating compressor according to the set freeze-thawing cycle related parameters.
The double-layer heat-insulating glass cover plate 9 is composed of double-layer heat-insulating glass and sealing strips, has heat-insulating sealing characteristics to ensure the temperature stability in the freezing and thawing environment box body 1, and also has transparent visual characteristics, so that the appearance change of rock or frost heaving cracking process in the freezing and thawing cycle process can be recorded in real time by using an external industrial camera.
The distributed film pressure sensor 10 comprises a sensor and a series of dupont wires, wherein the sensor is arranged on the surface of a rock sample to be tested, pressure signals received by a sensing area are converted into electric signals and are transmitted to the frost heaving pressure monitoring system 3 containing ice cracks through the dupont wires, the electric signals are converted into the pressure signals again to be transmitted to the total control analysis system for analysis, and further a frost heaving pressure evolution curve inside the ice cracks in the freeze thawing cycle process is obtained.
The temperature sensor 11 comprises a series of sub temperature sensors, wherein the sub temperature sensors are arranged on the side surface of the visual freeze thawing environment box body 2 to monitor the temperature curve in the box body in the freeze thawing cycle process, the sub temperature sensors are arranged on the surface of a rock sample to monitor the temperature curve of the surface of the rock sample, and the sub temperature sensors are arranged on the surface of an ice-containing crack to monitor the temperature curve in the crack of the rock sample.
The working principle of the rock damage detection system 5 is that a rock sample after setting the freeze thawing cycle times is subjected to a treatment method of drying and then water saturation, the drying and water saturation quality of the rock sample is measured, serial quality data are transmitted to the total control analysis system 1 for processing, the porosity n, the mass loss rate M and the damage variable S of the rock sample are obtained, and the rock damage detection system 5 comprises a drying chamber 12 and a water saturation chamber 13.
The drying chamber is composed of a transmission crawler 15 and a weighing instrument 14, wherein the transmission crawler 15 is used for conveying rock samples subjected to a designated number of freeze thawing cycles from the freeze thawing chamber to the drying chamber of the damage detection system, and the weighing instrument 14 is used for weighing the mass of the freeze thawing samples dried in the drying chamber in real time.
The water saturation chamber is composed of a transmission crawler 15 and a water saturation region 16, the transmission crawler 15 is used for conveying the dried rock samples from the drying chamber to the water saturation chamber, and the water saturation region 16 is used for carrying out water saturation treatment according to specifications after the freeze-thawing rock samples with different freeze-thawing cycle times are dried.
The dried samples were sequentially added with water at rock heights of 1/3, 2/3, and 3/3 every 6 hours, and finally immersed for 6 hours, and the treated samples were regarded as saturated water samples.
Stainless steel plates with proper thickness are adopted to separate the systems so as to ensure stable temperature in the box body 2 in the visual freeze thawing environment. Because the acquisition of temperature data and ice-containing crack frost heaving pressure data all need be carried out in the inside of visual freeze thawing environment box 2, the visual freeze thawing environment box 2 lateral wall is equipped with the line mouth in order to make things convenient for temperature sensor and distributed film pressure sensor's arrangement, adopts sealed lid to carry out heat-proof seal to the line mouth after sensor and connecting wire arrangement are accomplished.
The embodiment also provides a rock freeze-thawing cycle test method for monitoring frost heaving force and freeze-thawing damage, which comprises the following steps: (1) setting relevant parameters of freeze thawing cycle and whether to monitor frost heaving pressure of the ice-containing crack and detect freeze thawing damage on an operating system; (2) placing a sample to be tested on a sample rack of a freeze thawing chamber; (3) if the frost heaving pressure of the crack containing ice is to be monitored, installing a distributed film pressure sensor on the surface of a sample to be tested before the start of a freeze thawing cycle test; (4) if freeze thawing damage detection is required, placing the sample on a transmission track; (5) and carrying out a freeze-thawing cycle test of the rock, monitoring ice-containing crack frost heaving pressure and detecting freeze-thawing damage according to a set freeze-thawing cycle test scheme.
Example 2
As shown in fig. 1-3, the rock freeze-thawing cycle test device capable of monitoring ice crack frost heave pressure and freeze-thawing damage in real time comprises a total control analysis system 1, a visual freeze-thawing environment box body 2, an ice crack frost heave pressure monitoring system 3, a temperature acquisition system 4 and a rock damage detection system 5. The total control analysis system 1 is a core part of rock freeze-thawing cycle test equipment, and is connected with other five systems for integrally controlling the freeze-thawing cycle test process and the integrated analysis of characteristic index data. The visual freeze-thawing environment box body 2 is used for placing rock samples to be subjected to freeze-thawing treatment and performing repeated freeze-thawing tests on the samples. One end of the frost heaving pressure monitoring system 3 containing ice cracks is connected with a distributed film pressure sensor 10 arranged in the fractured rock, the other end of the frost heaving pressure monitoring system is connected with a pressure data analysis module of the total control analysis system 1, and electric signals input by the sensor 10 are converted into pressure signals and then transmitted to the pressure data analysis module for analysis and display. One end of the temperature acquisition system 4 is connected with a temperature sensor 11 in the box body of the visual freeze thawing environment, and the other end of the temperature acquisition system is connected to a temperature curve display module of the total control analysis system 1, so that real-time acquisition and recording of temperature signals of all control points are realized, and the combined action of the temperature acquisition system and the total control analysis system 1 ensures smooth performance of freeze thawing cycle tests. The rock damage detection system 5 measures the drying and water saturation quality of the rock sample through the drying chamber 12 and the water saturation chamber 13, and transmits the series of quality data to the damage data analysis module of the total control analysis system 1 for quantitative analysis and display of freeze thawing damage.
As shown in fig. 1 and 4, the ice crack frost heave pressure monitoring system 3 comprises an ice crack frost heave pressure monitoring system 3, a distributed film pressure sensor 10, a sealing bag 19 and a dupont line 22, wherein the distributed film pressure sensor 10 is arranged on a fracture surface 21 of a rock sample to be measured, a pressure signal received by an induction area is converted into an electric signal and is transmitted to the ice crack frost heave pressure monitoring system 3 through the dupont line 22, and the monitoring system 3 converts the electric signal into a pressure data analysis module of a total control analysis system 1 to which the pressure signal is transmitted again, so that a frost heave pressure evolution curve inside the ice crack in the freeze thawing cycle process is obtained; the function of the sealing bag is to adhere the sealing bag to the fracture surface 21 of the rock sample 20 so as to ensure that the position of the distributed film pressure sensor 10 relative to the rock sample fracture surface 21 is unchanged during the freeze-thaw cycle test, and the insertion of the distributed film pressure sensor 10 into the sealing bag 19 can ensure high accuracy and multiple uses of the sensor 10.
As shown in fig. 1 and 3, the working principle of the rock damage detection system 5 is that a rock sample after setting the number of freeze thawing cycles is subjected to a treatment method of drying before water saturation, the drying and water saturation quality of the rock sample is measured, serial quality data are transmitted to a damage data analysis module of the total control analysis system 1 for processing, and the porosity n, the mass loss rate M and the damage variable S of the rock sample are obtained, and the rock damage detection system 5 comprises a drying chamber 12 and a water saturation chamber 13, which are connected through a transmission crawler 15.
The test flow for controlling freeze thawing cycle is as follows:
(1) firstly, adding a proper amount of clear water into the water storage tank 18 until the water level reaches the requirement;
(2) placing the rock sample subjected to water saturation treatment on a stainless steel sample frame 7 of the visual freeze thawing environment box body 2;
(3) after setting relevant parameters (freezing and thawing mode, freezing temperature, freezing speed, freezing time, thawing temperature, thawing speed, thawing time, freezing and thawing cycle times and the like) of the freezing and thawing cycle in the total control analysis system 1, starting a freezing and thawing cycle test;
(4) and (3) freezing and thawing cycle treatment process: firstly, the temperature in a freezing and thawing chamber is reduced to freezing temperature through a refrigerating compressor of a heating and refrigerating assembly 8, after a set freezing time, water in a water storage chamber 18 is heated to a specified thawing temperature by a heater of the heating and refrigerating assembly 8, then water in the water storage chamber 18 is extracted to a sample immersed in a visual freezing and thawing environment box 2 (a gas freezing and thawing mode), and after the set thawing time, one freezing and thawing cycle is completed.
The flow of the ice-containing crack frost heaving pressure monitoring system 3 is as follows:
(1) firstly, prefabricating rock sample cracks, adhering a sealing bag 19 with a proper size on the surface 21 of the rock sample cracks by using glue, and keeping for 6-12 hours to wait for the glue to dry;
(2) sealing the bottom of the rock fracture by adopting a waterproof heat-insulating material 23, and then filling water into the sample fracture to ensure the fracture to be full of water;
(3) placing the distributed film pressure sensor 10 in a sealing bag 19, fixing all the DuPont wires 22, and performing heat insulation sealing treatment on the wire through a sealing cover after the distributed film pressure sensor 10 and the DuPont wires 22 are arranged;
(4) the ice-containing crack frost heave pressure monitoring system 3 is started, the pressure signal received by the sensing area is converted into an electric signal and is transmitted to the ice-containing crack frost heave pressure monitoring system 3 through the DuPont line 22, the monitoring system 3 converts the electric signal into a pressure data analysis module of the total control analysis system 1 to which the pressure signal is transmitted again, and further a frost heave pressure evolution curve inside the ice-containing crack in the freeze thawing cycle process is obtained.
The rock damage detection system 5 operates as follows:
(1) a conveyor track 15 for placing a particular rock sample into the freeze-thaw chamber;
(2) after the appointed freeze thawing cycle times, pushing the rock sample to the weighing instrument 14 in the drying chamber 12 through the transmission crawler 15 for drying treatment;
(4) in the drying process, the damage data analysis module of the total control analysis system 1 records the quality of the rock sample in real time, and when the quality of the rock sample is not changed with time any more, the rock sample is considered to be dried;
(5) after the drying treatment is completed, the dried rock sample is pushed into a water saturation region 16 in the water saturation chamber 13 through a transmission crawler 15;
(6) after the drying treatment of the rock samples after each specified freeze thawing cycle is completed, carrying out water saturation treatment in a water saturation region 16;
(7) after the saturation treatment of all the specific rock samples is completed, the specific rock samples are sequentially pushed into the weighing instrument 14 through the transmission crawler 15, and the saturation quality is measured.
The rock freeze-thawing cycle test equipment and the method capable of monitoring the ice-containing crack freeze-swelling pressure and the freeze-thawing damage in real time aim to conduct the rock freeze-thawing cycle test, simultaneously, quantitatively and automatically and accurately evolve the ice-containing crack freeze-swelling pressure in real time, and quantitatively characterize the rock freeze-thawing damage by adopting double parameters (mass loss and porosity).
The porosity n is calculated as follows:
wherein m is sat Is saturated rock mass, m dry To dry rock mass ρ w For the density of water, V is the volume of the rock sample.
Calculation of the mass damage rate M is characterized by the dry mass of the sample:
wherein m is 1 For drying mass of rock sample before freeze-thawing cycle, m 2 Is the mass of the dried rock sample after the freeze-thaw cycle.
Freeze-thaw damage variable S characterized based on sample porosity n:
wherein S is i The damage variable of the rock sample after i freeze thawing cycles; n is n i And n 0 The porosity of the rock sample after i freeze-thaw cycles and the porosity of the rock sample that has not undergone a freeze-thaw cycle, respectively.
The foregoing examples merely illustrate specific embodiments of the invention, which are described in greater detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention.
Claims (8)
1. The rock freeze-thawing cycle test equipment for monitoring freeze-swelling pressure and freeze-thawing damage is characterized by comprising a total control analysis system, a visual freeze-thawing environment box body, an ice-containing crack freeze-swelling pressure monitoring system, a temperature acquisition system, a rock damage detection system and a water level control system; the total control analysis system is used for controlling the whole freeze thawing test process and carrying out integrated analysis on all data; the visual freeze thawing environment box comprises a stainless steel box body, a stainless steel sample rack arranged in the stainless steel box body, a double-layer heat-insulating glass cover plate arranged at the top of the stainless steel box body and a heating and refrigerating assembly arranged at the bottom of the stainless steel box body, and is used for carrying out freeze thawing cycle treatment on a placed rock sample; the ice crack-containing frost heaving pressure monitoring system monitors the frost heaving pressure of the ice crack in the freeze thawing process in real time through a distributed film pressure sensor arranged in the box body of the visual freeze thawing environment; the temperature acquisition system acquires temperature signals of all positions of the visual freeze thawing environment box body in the freeze thawing process in real time through a temperature sensor arranged in the visual freeze thawing environment box body; the rock damage detection system transmits the series of quality data to the total control analysis system through the weighing instrument to quantitatively analyze the freeze-thawing damage degree of the sample; the water level control system comprises a water storage chamber and a water level sensor arranged in the water storage chamber and is used for controlling water supplementing and water returning levels in the box body in the visual freeze thawing environment.
2. The rock freeze-thaw cycle test apparatus for monitoring freeze-swell pressure and freeze-thaw damage according to claim 1, wherein the overall control analysis system comprises a parameter control module, a pressure data analysis module, a temperature curve display module, a damage data analysis module, and a water level control module; wherein:
the parameter control module is used for presetting freeze-thawing cycle related parameters, is connected with a power supply control end of the heating and refrigerating assembly and controls the heating and refrigerating assembly to work;
the pressure data analysis module is connected with a signal output port of the ice-containing crack frost heaving pressure monitoring system and is used for displaying an evolution curve of the ice-containing crack frost heaving pressure along with time in real time;
the temperature curve display module is connected with a port of the temperature acquisition system and is used for displaying the temperature curve of each control point in the box body in the visual freeze thawing environment in real time;
the damage data analysis module is connected with a signal output port of a weighing instrument in the rock damage detection system and is used for collecting the drying mass m of a rock sample dry And saturated water mass m sat Based on the porosity n, the mass loss rate M and the damage variable S of the rock sample are automatically calculated;
the water level control module is connected with a control port of the water level control system, when the water level control module is switched to a gas-freezing water thawing mode, the water level control system is in an open state, namely water in the water storage chamber can be pumped into the box body of the visual freezing and thawing environment after being heated in the thawing process, otherwise, when the water level control module is switched to the gas-freezing gas thawing mode, the water level control system is in a closed state, so that the two freezing and thawing modes of gas-freezing water thawing or gas-freezing gas thawing are set according to requirements.
3. Rock freeze-thaw cycle test equipment for monitoring freeze-swell pressure and freeze-thaw damage according to claim 2, wherein the calculation of porosity n is as follows:
wherein m is sat Is saturated rock mass, m dry To dry rock mass ρ w Is the density of water, V is the volume of the rock sample;
calculation of the mass loss rate M is characterized by the dry mass of the sample:
wherein m is 1 For drying mass of rock sample before freeze-thawing cycle, m 2 The mass of the dried rock sample after freeze-thawing cycle;
freeze-thaw damage variable S characterized based on sample porosity n:
wherein S is i The damage variable of the rock sample after i freeze thawing cycles; n is n i And n 0 The porosity of the rock sample after i freeze-thaw cycles and the porosity of the rock sample that has not undergone a freeze-thaw cycle, respectively.
4. The rock freeze-thawing cycle test equipment for monitoring frost heaving pressure and freeze-thawing damage according to claim 1, wherein the stainless steel sample rack is divided into an upper layer, a middle layer and a lower layer, is arranged in the middle of a box body in a visual freeze-thawing environment, and consists of upright posts and partition plates, wherein the partition plates are hollow partition plates so as to facilitate water circulation in a gas freeze-thawing mode.
5. The rock freeze-thaw cycle test apparatus for monitoring freeze-thaw stress and freeze-thaw damage according to claim 1, wherein the heating and refrigeration assembly is composed of a heater for heating water inside a water storage chamber to a specified thawing temperature and a refrigeration compressor for reducing a temperature inside the freeze-thaw chamber to the specified freezing temperature; the heating and refrigerating assembly is connected with a parameter control module of the total control analysis system, and the heating machine and the refrigerating compressor are controlled to work according to the set freeze-thawing cycle related parameters.
6. The rock freeze-thaw cycle test apparatus for monitoring freeze-swell pressure and freeze-thaw damage according to claim 1, wherein the distributed film pressure is located in a sealing bag and is installed on the surface of a rock sample to be tested, the sealing bag is adhered to the fracture surface of the rock sample, the pressure signal received by the sensing area is converted into an electric signal and is transmitted to the ice-containing fracture freeze-swell pressure monitoring system through a dupont line, and waterproof and heat-insulating materials are arranged at the bottoms of the fractures of the rock sample.
7. The rock freeze-thaw cycle test apparatus for monitoring freeze-swell pressure and freeze-thaw damage of claim 1, wherein the rock damage detection system comprises a drying chamber and a saturation chamber; the drying chamber comprises a transmission crawler belt and a weighing instrument, wherein the transmission crawler belt is used for conveying the rock sample subjected to the freeze-thawing cycle for the designated times from the freeze-thawing chamber to the drying chamber of the damage detection system, and the weighing instrument is used for weighing the mass of the freeze-thawing sample dried in the drying chamber in real time; the water saturation chamber comprises a transmission crawler belt and a water saturation region, wherein the transmission crawler belt is used for conveying the dried rock samples from the drying chamber to the water saturation chamber, and the water saturation region is used for carrying out water saturation treatment according to specifications after the freeze-thawing rock samples with different freeze-thawing cycle times are dried.
8. A rock freeze-thaw cycle test method for monitoring freeze-swell pressure and freeze-thaw damage, wherein the rock freeze-thaw cycle test apparatus for monitoring freeze-swell pressure and freeze-thaw damage according to any one of claims 1-7 is employed; the method comprises the following steps:
(1) setting relevant parameters of freeze thawing cycle and whether to monitor frost heaving pressure of the ice-containing crack and detect freeze thawing damage on an operating system;
(2) placing a sample to be tested on a sample rack of a freeze thawing chamber;
(3) if the frost heaving pressure of the crack containing ice is to be monitored, installing a distributed film pressure sensor on the surface of a sample to be tested before the start of a freeze thawing cycle test;
(4) if freeze thawing damage detection is required, placing the sample on a transmission track;
(5) and carrying out a freeze-thawing cycle test of the rock, monitoring ice-containing crack frost heaving pressure and detecting freeze-thawing damage according to a set freeze-thawing cycle test scheme.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311046904.3A CN117250219A (en) | 2023-08-19 | 2023-08-19 | Rock freeze-thawing cycle test equipment and method for monitoring frost heaving pressure and freeze-thawing damage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311046904.3A CN117250219A (en) | 2023-08-19 | 2023-08-19 | Rock freeze-thawing cycle test equipment and method for monitoring frost heaving pressure and freeze-thawing damage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117250219A true CN117250219A (en) | 2023-12-19 |
Family
ID=89125551
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311046904.3A Pending CN117250219A (en) | 2023-08-19 | 2023-08-19 | Rock freeze-thawing cycle test equipment and method for monitoring frost heaving pressure and freeze-thawing damage |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117250219A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107631940A (en) * | 2017-10-25 | 2018-01-26 | 武汉科技大学 | A kind of rock fracture frost heave force test device under Action of Vertical Loads |
| CN111198136A (en) * | 2020-02-17 | 2020-05-26 | 北京科技大学 | Rock mass ice crack network frost heaving expansion process monitoring test system and method |
| CN112147177A (en) * | 2020-09-25 | 2020-12-29 | 重庆大学 | Rock freezing-thawing cycle test equipment and method for measuring circumferential strain |
| CN217688925U (en) * | 2022-04-21 | 2022-10-28 | 中国地质调查局成都地质调查中心（西南地质科技创新中心） | Model box for freezing and thawing cycle test of side slope |
| CN115876634A (en) * | 2023-03-02 | 2023-03-31 | 中国有色金属工业昆明勘察设计研究院有限公司 | Rock freezing-thawing cycle degradation overall process multi-channel test equipment and test method |
-
2023
- 2023-08-19 CN CN202311046904.3A patent/CN117250219A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107631940A (en) * | 2017-10-25 | 2018-01-26 | 武汉科技大学 | A kind of rock fracture frost heave force test device under Action of Vertical Loads |
| CN111198136A (en) * | 2020-02-17 | 2020-05-26 | 北京科技大学 | Rock mass ice crack network frost heaving expansion process monitoring test system and method |
| CN112147177A (en) * | 2020-09-25 | 2020-12-29 | 重庆大学 | Rock freezing-thawing cycle test equipment and method for measuring circumferential strain |
| CN217688925U (en) * | 2022-04-21 | 2022-10-28 | 中国地质调查局成都地质调查中心（西南地质科技创新中心） | Model box for freezing and thawing cycle test of side slope |
| CN115876634A (en) * | 2023-03-02 | 2023-03-31 | 中国有色金属工业昆明勘察设计研究院有限公司 | Rock freezing-thawing cycle degradation overall process multi-channel test equipment and test method |
Non-Patent Citations (2)
| Title |
|---|
| 钱波 等: "白鹤滩水电站左岸边坡岩石损伤变形反馈分析", 《岩土工程学报》, vol. 41, no. 8, 31 August 2019 (2019-08-31), pages 1464 - 1471 * |
| 高峰 等: "冻融循环作用下饱水砂岩的强度劣化模型", 《岩土力学》, vol. 40, no. 3, 31 March 2019 (2019-03-31), pages 926 - 932 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104101563B (en) | Portable spontaneous imbibition measuring device | |
| CN104237305B (en) | A kind of rock mass testing device for measuring thermal conductivity and test system | |
| CN207764217U (en) | A kind of earth pillar device of the one-dimensional hydro-thermal salt migration of closed simulation frozen soil | |
| CN102520003A (en) | Device for testing ambient-temperature gradient freezing and thawing processes | |
| CN102854384B (en) | Device for measuring temperature and resistivity distribution in phase-changing process in frozen soil test | |
| CN110031608A (en) | Ever-frozen ground frozen swell and melt settlement characteristic test apparatus and its test method | |
| KR20190021888A (en) | Loading device of freeze testing apparatus for ground | |
| CN104215566A (en) | Visual soil freeze-thawing process test apparatus | |
| CN111272604A (en) | Device and method for monitoring freezing and thawing process of seasonal frozen soil | |
| CN108318607B (en) | Temperature-controllable transparent static box and greenhouse gas field in-situ acquisition method | |
| CN105158438A (en) | Tester for soil frost-heaving ratio | |
| CN114324603B (en) | Rock degradation testing method based on filling joint wave impedance under action of freeze-thaw cycle | |
| KR101979775B1 (en) | Freeze testing apparatus for ground using up and down motion type multiplex cell | |
| CN117250219A (en) | Rock freeze-thawing cycle test equipment and method for monitoring frost heaving pressure and freeze-thawing damage | |
| CN213813610U (en) | Multifunctional road base layer mixture curing, freezing and thawing cycle all-in-one machine | |
| CN109632616A (en) | One kind is from snow melt road surface water stability test device and test method | |
| CN213275573U (en) | Device for testing enrichment layer of coarse-grained saline soil foundation | |
| CN116818588A (en) | Rock-soil property parameter and deformation testing device and method under variable temperature and variable humidity conditions | |
| CN115876634A (en) | Rock freezing-thawing cycle degradation overall process multi-channel test equipment and test method | |
| CN202049154U (en) | Long-term thaw performance simulating and evaluating device for salinization self-thaw road surface | |
| CN116465758A (en) | Direct shear test device and method for measuring tendon-soil interface parameters under freeze thawing cycle | |
| CN116773583A (en) | Crack rock mass frost heaving load and damage expansion characteristic test device and method | |
| CN108333323A (en) | A kind of body frost heaving rate measuring device and measurement method | |
| CN110320345A (en) | A kind of portable field capacity auto testing instrument and test method | |
| CN112903561B (en) | Permeable pavement brick permeable rate detection device |
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 |