CN110261579B - Automatic control rock soil dry-wet circulation test method and device - Google Patents
Automatic control rock soil dry-wet circulation test method and device Download PDFInfo
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- CN110261579B CN110261579B CN201910590447.1A CN201910590447A CN110261579B CN 110261579 B CN110261579 B CN 110261579B CN 201910590447 A CN201910590447 A CN 201910590447A CN 110261579 B CN110261579 B CN 110261579B
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- 239000011435 rock Substances 0.000 title claims abstract description 41
- 239000002689 soil Substances 0.000 title claims abstract description 39
- 238000010998 test method Methods 0.000 title claims abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 188
- 238000012360 testing method Methods 0.000 claims abstract description 88
- 238000000034 method Methods 0.000 claims abstract description 31
- 230000008569 process Effects 0.000 claims abstract description 26
- 239000000523 sample Substances 0.000 claims description 84
- 238000005303 weighing Methods 0.000 claims description 54
- 238000005485 electric heating Methods 0.000 claims description 33
- 238000012544 monitoring process Methods 0.000 claims description 25
- 230000005540 biological transmission Effects 0.000 claims description 20
- 238000010438 heat treatment Methods 0.000 claims description 19
- 238000001035 drying Methods 0.000 claims description 14
- 239000004575 stone Substances 0.000 claims description 10
- 238000009736 wetting Methods 0.000 claims description 10
- 230000001105 regulatory effect Effects 0.000 claims description 9
- YKTSYUJCYHOUJP-UHFFFAOYSA-N [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] Chemical compound [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] YKTSYUJCYHOUJP-UHFFFAOYSA-N 0.000 claims description 8
- 239000000835 fiber Substances 0.000 claims description 8
- 238000002347 injection Methods 0.000 claims description 7
- 239000007924 injection Substances 0.000 claims description 7
- 238000009413 insulation Methods 0.000 claims description 7
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 239000012774 insulation material Substances 0.000 claims description 6
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 6
- 229910001220 stainless steel Inorganic materials 0.000 claims description 6
- 239000010935 stainless steel Substances 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 230000001276 controlling effect Effects 0.000 claims description 5
- 238000004321 preservation Methods 0.000 claims description 5
- 239000000919 ceramic Substances 0.000 claims description 4
- 238000012545 processing Methods 0.000 claims description 4
- 229910000746 Structural steel Inorganic materials 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 238000007791 dehumidification Methods 0.000 claims description 3
- 230000005484 gravity Effects 0.000 claims description 3
- 229910052697 platinum Inorganic materials 0.000 claims description 3
- 125000004122 cyclic group Chemical group 0.000 abstract 2
- 230000006872 improvement Effects 0.000 description 7
- 230000008859 change Effects 0.000 description 5
- 238000002474 experimental method Methods 0.000 description 5
- 238000007605 air drying Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000009423 ventilation Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 239000008239 natural water Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/24—Earth materials
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
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Abstract
The invention discloses an automatic control rock soil dry-wet cycle test method and device, comprising the following steps: A. placing the test sample in a tray, and switching on a power supply/switch; B. inputting wet and dry standing time and circulation times in a time controller instrument panel, setting working temperature in the temperature controller instrument panel, and inputting the dry state moisture content, wet state moisture content and total weight of a sample in a moisture content controller instrument panel; C. the water content controller monitors the water content of a sample in the oven in real time; D. the temperature controller dynamically monitors and adjusts the temperature in the working chamber; E. and the time controller uniformly controls the test process until the whole dry-wet cycle test is finished, and automatically stopping the device. The invention integrates the time control system, the temperature control system and the water content control system, realizes the automatic control of the dry and wet cyclic test of the rock and soil, has simple operation, improves the accuracy of the test, and simultaneously solves the parallel test problem in the dry and wet cyclic test of the rock and soil.
Description
Technical Field
The invention relates to the technical field of geotechnical engineering, in particular to an automatic control geotechnical dry and wet cycle test method and device.
Background
When the roadbed is built, the roadbed is compacted and formed near the OMC with the optimal water content. In the initial stage of road construction, roadbed soil is in an unsaturated state, roadbed is continuously humidified in the operation process, and balance is achieved within 2 to 3 years, namely, the balance humidity of roadbed. The factors influencing the humidity of the roadbed and the time for reaching the equilibrium state are many, and the factors are different according to the factors such as the areas, the ground water level, the climate, roadbed filling materials, the quality of drainage facilities, traffic characteristics and the like. However, the balance humidity of the roadbed is not stable and unchanged, the roadbed exposed in the nature is continuously interfered by the environmental factors such as underground water lifting, atmospheric rainfall, solar evaporation and the like, and the humidity of the roadbed is increased and fluctuation changes are reduced. Because of the long-term dry-wet circulation, the strength and microstructure of the soil body are influenced, so that disasters such as slope instability, roadbed collapse and the like are caused, and huge economic loss and casualties are caused.
The traditional rock soil dry-wet circulation instrument is manually operated, the automation degree is low, the wet-dry circulation experiment is long in time consumption, the humidification and drying conversion process is manually realized, the manual operation is large in labor capacity and low in efficiency, the cost is high, and the experimental result discreteness is large due to the fact that the manual operation is large in experimental interference.
In the existing automatic dry-wet circulation test device, as the technology of a 'dry-wet circulation test device' with the patent application number ZL201420392852.5, the device comprises a box body, a test piece frame is arranged in the box body, a spray head is arranged above the test piece frame, a space for containing test media is arranged in the box body, the space is connected with the spray head through a pump, and a circulation timer is electrically connected with the pump; at least one air-drying electric fan facing the test piece rack is arranged on the box body. The test rack has a certain height, the space for containing test media is formed in the box body under the test piece rack, and the bottom of the box body is communicated with the pump. Although the device can realize the purpose of dry and wet rock soil circulation test, the whole experimental circulation process only depends on preset time control, the degree of automation is not high, and the experimental value and the design value are easily deviated greatly in the experimental process, so that the experimental result is influenced. In another technology of an automatic rock sample dry-wet circulation experimental instrument with a patent application number ZL201410610585.9, a synchronous pulley and a synchronous belt in a dry-wet circulation mechanism transmit power input by a stepping motor to drive screw drive columns arranged on two sides to rotate; the cross beam is matched with the two threaded transmission columns through threads, and the rotation of the threaded transmission columns drives the cross beam to move up and down, so that the sample adjusting mechanism is driven to circularly immerse the sample in the water tank, soak the sample in the water tank, and lift the sample to an air drying area for air drying. The rock sample dry-wet cycle test process is automatically controlled by a matched detection control and processing module arranged outside according to a program. Although the device can realize the purpose of automatically controlling the dry-wet cycle test of the rock sample, the device can not realize accurate control of temperature and can not perform parallel test, so that the test has great contingency. Therefore, an automatic control rock soil dry-wet cycle experiment device and method which have higher automation degree and more comprehensive control factors and can simultaneously carry out dry-wet cycle experiments on a plurality of groups of samples are required to be innovated.
Disclosure of Invention
The first aim of the invention is to provide an automatic control rock soil dry-wet circulation experiment method, wherein the time control system is used for adjusting the wet and dry circulation states and circulation times of all samples in the experiment process, the thermodynamic system is dynamically adjusted by combining a temperature controller, and the water content of the samples is dynamically adjusted by the water content adjuster, so that the working state of the rock soil dry-wet circulation automatic control device is realized.
The invention aims at providing an automatic control rock soil dry-wet cycle test device which is convenient to use, efficient in operation, economical and energy-saving.
In order to achieve the first object, the present invention adopts the following technical scheme: an automatic control rock soil dry-wet cycle test method comprises the following steps:
A. preparing a test sample, placing the test sample into a movable tray, switching on a power supply/switch of a dry-wet circulating device, and controlling the power supply states of a time control system, a temperature control system and a water content control system by the power supply/switch in an overall manner, wherein a time controller in the time control system controls the wetting and drying circulating states and the circulating times of the test sample; the temperature controller in the temperature control system directly controls the working states of the electric heating pipe and the electric fan, the electric heating pipe and the electric fan provide drying hot air for the dry-wet circulation working chamber, and the temperature in the dry-wet circulation working chamber is controlled in real time; the water content controller in the water content control system controls the water inlet valve of the water inlet and controls the water content of the sample in the dry-wet circulation working chamber in real time through feedback information of the water content monitoring probe and the weighing sensor;
B. inputting wet standing time, dry standing time and cycle times into a time controller instrument panel, setting initial working temperature of a dry-wet circulating device into the temperature controller instrument panel, and inputting parameters such as dry state water content, wet state water content, total weight of a sample and the like into a water content controller instrument panel;
C. after corresponding data are set on instrument panels of the time controller, the temperature controller and the water content controller, the dry-wet circulating device starts to work, firstly, the water inlet valve is automatically opened, the water inlet speed is controlled, test water is slowly injected into the permeable stone through the water injection hose, the weighing sensor monitors the weight of a sample in the dry-wet circulating working chamber in real time, and when the total weight of the sample reaches a set value, the water content controller closes the water inlet valve and stops water injection;
D. after the water inlet valve is closed, the sample naturally absorbs water, a water content monitoring probe arranged in the sample monitors and feeds the water content information of the sample back to a water content controller, and when the water content reaches a set value, the water content controller sends a signal to a time controller, and the time controller starts to calculate wetting standing time;
E. when the set standing time is reached, the time controller sends a heating command to the temperature controller, the device automatically opens the air inlet valve and the air outlet valve, the hot air system starts to work, the temperature sensor monitors the temperature inside the dry-wet circulation working chamber in real time, temperature information is fed back to the temperature controller for processing and displaying, and the temperature controller dynamically adjusts the working state of the hot air system according to the difference between the working temperature and the real-time temperature;
F. when the total weight of the sample reaches a set value, the water content controller sends a command to the temperature controller, heating is stopped at the moment, natural cooling is performed, the water content monitoring probe monitors and feeds the water content information of the sample back to the water content controller, when the water content reaches the set value, the water content controller sends a signal to the time controller, the air inlet valve and the air outlet valve are closed, and the time controller starts to calculate the drying standing time; when the set standing time is reached, the time controller sends a command to the water content controller again, the water inlet valve is opened, and then the next cycle test is carried out until the whole cycle test is finished.
The invention has the remarkable technical effects that: the wetting and drying circulation states and the circulation times of the sample in the test process are integrally regulated through the time control system, the thermodynamic system is dynamically regulated through the combination of the temperature controller, the water content of the sample is dynamically regulated through the water content regulator, the working state of the rock soil dry and wet circulation device is automatically controlled, the test accuracy is improved, and meanwhile, the parallel test problem in the rock soil dry and wet circulation test is solved.
In order to achieve the second object, the present invention adopts the following technical scheme: the automatic control rock soil dry-wet circulation test device comprises a box body, a hot air system, a time control system, a temperature control system, a water content control system and a test piece containing device, wherein the box body is a square hollow box with a built-in dry-wet circulation working chamber and consists of the dry-wet circulation working chamber and a box body shell; the hot air system consists of a heating chamber, an electric fan and an electric heating pipe, the time control system is controlled by a time controller, the temperature control system consists of a temperature controller and a temperature sensor, and the water content monitoring system consists of a water content controller, a water inlet valve, a weighing sensor, a water content monitoring probe and a weighing tray; the test piece containing device is placed in a dry-wet circulation working chamber of the box body, the hot air system is embedded in the left side of the dry-wet circulation working chamber, the time control system is embedded in the left upper side of the box body shell, the temperature control system is embedded in the lower part of the box body shell, and the water content control system is embedded in the left lower side of the box body shell; the power supply/switch is connected with a time controller in the time control system, the time controller is simultaneously connected with a temperature controller in the temperature control system and a water content controller in the water content control system, the temperature controller is respectively connected with a temperature sensor, an electric heating pipe in the hot air system and an electric fan, and the water content controller in the water content monitoring system is respectively connected with a water content monitoring probe, a water inlet valve and a weighing sensor.
As an improvement of the above technical scheme, in one embodiment of the invention, aluminum silicate fiber heat insulation materials are filled between the dry-wet circulation working chamber and the box shell, the box shell is made of a thin steel plate, the dry-wet circulation working chamber is made of a high-quality structural steel plate, an air outlet of an air exhaust pipeline is arranged at the upper part of the dry-wet circulation working chamber, a side door is arranged on the front vertical surface of the box, an air outlet is arranged at the bottom end of the right side surface, and a water inlet and four supporting feet are arranged at the bottom.
As an improvement of the technical scheme, in one embodiment of the invention, an electric heating pipe is vertically arranged in a heating chamber, an electric fan is arranged at the lower side of the electric heating pipe and is not connected with the electric heating pipe, the electric fan is a low-noise high-temperature-resistant axial flow fan, an impeller and a volute of the electric fan are both made of stainless steel, an electric fan main machine is arranged at the left side of a box body, and an aluminum silicate fiber heat insulation material is arranged between the electric fan main machine and the heating chamber; the electric heating pipe is formed by arranging a plurality of heating pipes in parallel and is arranged at the left part of the dry-wet circulation working chamber, and a heat preservation and insulation layer is arranged between the electric heating pipe and the dry-wet circulation working chamber.
In one embodiment of the invention, the time controller is integrated with the data processor, the timer, the display and the control panel, and is used as an information transmission center, and is respectively connected with the temperature controller, the water content controller and the power supply/switch by adopting conductive wires to uniformly control the whole test process.
As an improvement of the technical scheme, in one embodiment of the invention, the temperature sensor is arranged at the left side of the dry-wet circulation working chamber and is connected with the temperature controller through a transmission wire, the temperature controller is integrated with the data processor, the display and the control panel into a whole and is connected with the temperature sensor through the transmission wire to collect and process the data of the temperature sensor, and meanwhile, the transmission wire is connected with the electric heating pipe and the electric fan to further control the hot air system, so that the temperature state in the dry-wet circulation working chamber is monitored and regulated in real time.
As an improvement of the technical scheme, in one embodiment of the invention, the water content monitoring probe is arranged in a sample, the measured water content data is transmitted to the water content controller in real time, the weighing tray is connected with the weighing sensor through the heat insulation ceramic pad, the weighing sensor is connected with the water content controller through the transmission wire, the water content controller is integrated with the weighing sensor through the data processor, the display and the control panel, and the water content controller is connected with the weighing sensor through the transmission wire, so that the data of the weighing sensor are collected and processed, the water content information of the sample can be displayed and monitored in real time, and meanwhile, the switching state of the water inlet valve is controlled, and the dehumidification and humidification processes of the sample are controlled; the weighing tray is a tray made of stainless steel, four weighing sensors are arranged below the weighing tray, and the weighing tray transmits the gravity of the movable bracket to the weighing sensors.
As an improvement of the technical scheme, in one embodiment of the invention, the test piece containing device consists of a permeable stone, a tray frame and a tray, wherein the tray frame is fixed at a position 1/6-1/5 of the distance between a dry-wet circulation working chamber and the bottom surface, the tray frame adopts a heat-resistant steel grid, the number of the trays is 6, the trays are uniformly fixed on the tray frame, the shape and the size of the tray can be selected according to rock and soil samples, and the permeable stone is arranged on the tray.
As an improvement of the above technical scheme, in one embodiment of the invention, a reserved test interface is arranged at the lowest part of the left side of the box body and is used for testing parameters such as rebound, stress, strain and the like of a sample.
As an improvement of the above technical solution, in one embodiment of the present invention, the temperature sensor is in the form of a high-temperature high-precision platinum resistor pt100, the maximum measuring range is 110 ℃, and the measurement error is less than 0.1 ℃.
Compared with the prior art, the invention has the following beneficial effects: the invention can automatically control the operation of the rock soil dry and wet circulating device and has the characteristics of convenience, high efficiency, energy conservation and the like. Compared with the traditional rock soil dry-wet circulation instrument, the device integrates a time control system, a temperature control system and a water content control system, realizes the high-automation control of the dry-wet circulation test, solves the problems of large labor capacity, low efficiency and high cost in the dry-wet circulation test, and has the manual operation of large interference to the test result, thereby improving the test efficiency and the test precision. Compared with a 'dry-wet cycle experimental device' with the patent application number ZL201420392852.5, the method and the device design a temperature control system and a water content control system, can monitor and control the temperature and the water content change in a dry-wet cycle working chamber in real time, dynamically adjust the test conditions according to the design value, are different from the dry-wet cycle experimental device which can only control the whole test process by means of preset time, and solve the problem of experimental result errors caused by low automation degree. Compared with an automatic rock sample dry-wet circulation experimental instrument with a patent application number ZL201410610585.9, the method and the device are additionally provided with the temperature control system, so that the accurate control of the test drying temperature is realized, the influence of temperature change on a test result is reduced, the test accuracy is improved, multiple groups of parallel tests are simultaneously carried out, and accidental events in the test are avoided. In addition, the humidifying process of the test adopts a natural water absorption mode, so that the dry-wet circulation process of the roadbed in the actual engineering can be reduced to the greatest extent.
Drawings
In order to more clearly illustrate the technical solutions of the present invention, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a structural elevation view of an automatically controlled soil and rock dry and wet cycle test apparatus of the present invention;
FIG. 2 is a cross-sectional view of the structure of FIG. 1 at I-I in accordance with the present invention;
FIG. 3 is a plan view of the weighing tray of the present invention;
fig. 4 is a control principle frame diagram of the automatic control rock soil dry-wet cycle test method of the invention.
In the figure: 1-box, 2-hot air system, 3-time control system, 4-temperature control system, 5-moisture content control system, 6-test piece holding device, 7-power/switch, 8-reserved test interface, 9-time controller, 10-temperature controller, 11-moisture content controller, 12-ventilation pipeline air inlet, 13-heating chamber, 14-electric heating pipe, 15-insulating layer, 16-air inlet, 17-electric fan, 18-tray frame, 19-temperature sensor, 20-water permeable stone, 21-tray, 22-ventilation pipe air outlet, 23-weighing tray, 24-water inlet, 25-weighing sensor, 26-water injection hose, 27-air outlet, 28-supporting leg, 29-ventilation pipeline, 30-water inlet valve, 31-air inlet valve, 32-air outlet valve, 33-wheel, 34 dry and wet cycle working chamber, 35-moisture content monitoring probe, 36-sample.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The method for automatically controlling the dry and wet cycle test of the rock soil provided by the embodiment of the invention, as shown in figures 1-4, comprises the following steps:
A. preparing a test sample 36, placing the test sample in a movable tray 21, switching on a power supply/switch 7 of a dry-wet circulation device, and controlling the power supply states of a time control system 3, a temperature control system 4 and a water content control system 5 by the power supply/switch 7 as a whole, wherein a time controller 9 in the time control system 3 controls the wetting, drying and circulating states and the circulating times of the test sample; the temperature controller 10 in the temperature control system 4 directly controls the working states of the electric heating pipe 14 and the electric fan 17, the electric heating pipe 14 and the electric fan 17 provide drying hot air for the dry-wet circulation working chamber 34, and the temperature in the dry-wet circulation working chamber 34 is controlled in real time; the water content controller 11 in the water content control system 5 controls the water inlet valve 30, and controls the water content of the sample 36 in the dry-wet circulation working chamber 34 in real time through the feedback information of the water content monitoring probe 35 and the weighing sensor 25, so as to form a total-to-partial power control system, and the wetting and drying circulation processes of the sample in the whole test can be uniformly controlled;
B. inputting wet standing time, dry standing time and cycle times into a meter panel of a time controller 9, setting initial working temperature of a dry-wet circulating device into a meter panel of a temperature controller 10, and inputting parameters such as dry state water content, wet state water content, total weight of a sample and the like into a meter panel of a water content controller 11;
C. after corresponding data are set on the instrument panels of the time controller 9, the temperature controller 10 and the water content controller 11, the dry-wet circulation device starts to work, the water inlet valve 30 is automatically opened at first, the water inlet speed is controlled, the test water is slowly injected into the permeable stone 20 through the water injection hose 26, the weight of the sample 36 in the dry-wet circulation working chamber 34 is monitored by the weighing sensor 25 in real time, and when the total weight of the sample reaches a set value, the water content controller 11 closes the water inlet valve 30 and stops water injection;
D. after the water inlet valve 30 is closed, the sample naturally absorbs water, a water content monitoring probe 35 arranged in the sample monitors and feeds the water content information of the sample back to the water content controller 11, when the water content reaches a set value, the water content controller 11 sends a signal to the time controller 9, the time controller 9 starts to calculate the wetting standing time, and the wetting process of the test adopts a natural water absorption mode, so that the dry-wet circulation process of the roadbed in the actual engineering can be reduced to the greatest extent;
E. when the set standing time is reached, the time controller 9 sends a heating command to the temperature controller 10, the device automatically opens the air inlet valve 31 and the air outlet valve 32, the hot air system 2 starts to work, the temperature sensor 19 monitors the temperature inside the dry-wet circulation working chamber 34 in real time, the temperature information is fed back to the temperature controller 10 for processing and displaying, and the temperature controller 10 dynamically adjusts the working state of the hot air system 2 according to the difference between the working temperature and the real-time temperature; the temperature change in the dry-wet cycle working chamber 34 can be dynamically monitored and displayed in the dry-wet cycle process, and the temperature in the dry-wet cycle working chamber 34 is adjusted by utilizing the temperature information;
F. when the total weight of the sample 36 reaches a set value, the water content controller 11 sends a command to the temperature controller 10, heating is stopped at the moment, natural cooling is performed, the water content monitoring probe 35 monitors the water content of the sample in real time and feeds back the water content information of the sample to the water content controller 11, when the water content reaches the set value, the water content controller 11 sends a signal to the time controller 9, the air inlet valve 31 and the air outlet valve 32 are closed, and the time controller 9 starts to calculate the drying standing time; when the set standing time is reached, the time controller 9 sends a command to the water content controller 11 again, the water inlet valve 30 is opened, and then the next cycle test is carried out until the whole cycle test is finished; in the whole dry-wet circulation process, the water content control system 5 dynamically monitors the water content change of the sample, and displays and processes and utilizes the water content information in real time, so that the dry-wet circulation working state automatically controlled by the water content change state of the sample is realized.
According to the invention, the wetting and drying circulation states and the circulation times of the sample in the test process are integrally regulated through the time control system, the thermodynamic system is dynamically regulated by combining the temperature controller, the water content of the sample is dynamically regulated by the water content controller, the working state of the rock soil dry and wet circulation device is automatically controlled, the test accuracy is improved, and the parallel test problem in the rock soil dry and wet circulation test is solved.
The embodiment of the invention provides an automatic control rock soil dry-wet circulation test device, which is shown in figures 1-4 and comprises a box body 1, a hot air system 2, a time control system 3, a temperature control system 4, a water content control system 5 and a test piece containing device 6, wherein the test piece containing device 6 is arranged in a dry-wet circulation working chamber 34 of the box body 1, an aluminum silicate fiber heat insulation material is filled between the dry-wet circulation working chamber 34 and a shell of the box body 1, the hot air system 2 is inlaid at the left side of the dry-wet circulation working chamber 34, the time control system 3 is inlaid at the left upper side of the shell of the box body 1, the temperature control system 4 is inlaid at the lower part of the shell of the box body 1, and the water content control system 5 is inlaid at the left lower side of the shell of the box body 1; the box power supply/switch 7 is connected with a time controller 9 in the time control system 3, the time controller 9 is simultaneously connected with a temperature controller 10 in the temperature control system 4 and a water content controller 11 in the water content control system 5, the temperature controller 10 is respectively connected with a temperature sensor 19, an electric heating pipe 14 and an electric fan 17 in the thermodynamic system 2, and the water content controller 11 in the water content monitoring system 5 is respectively connected with a water content monitoring probe 35, a water inlet valve 30 and a weighing sensor 25.
The box body 1 is a square hollow box with a built-in dry-wet circulation working chamber 34, and consists of the dry-wet circulation working chamber 34 and the shell of the box body 1, wherein the dry-wet circulation working chamber 34 is connected with the shell of the box body 1 through an aluminum silicate fiber heat-insulating material. The casing of the box body 1 is made of a thin steel plate, the dry-wet circulation working chamber 34 is made of a high-quality structural steel plate, a heat exhaust air duct air outlet 22 is formed in the upper portion of the working chamber 34, a side door is arranged on the front vertical face of the box body 1, an air outlet 27 is formed in the bottom of the right side face, and a water inlet 24 and four supporting feet 28 are arranged at the bottom. The lowest part of the left side of the box body 1 is provided with a reserved test interface 8, and parameters such as rebound, stress, strain and the like of a test sample can be tested.
The hot air system 2 consists of a heating chamber 13, an electric fan 17 and an electric heating pipe 14, wherein the electric fan 17 and the electric heating pipe 14 are respectively connected with the temperature controller 10 through electric leads, the electric heating pipe 14 is vertically arranged in the heating chamber 13, the electric fan 17 is arranged at the lower side of the electric heating pipe 14 and is not connected with the electric heating pipe 14, the electric fan 17 is a low-noise high-temperature-resistant axial flow fan, impellers and scroll shells of the electric fan 17 are made of stainless steel, a main machine of the electric fan 17 is arranged at the left side of the box body 1, and an aluminum silicate fiber heat insulation material is arranged between the main machine of the electric fan 17 and the heating chamber 13; the electric heating pipe 14 is formed by arranging a plurality of (4-8) heating pipes in parallel, the electric heating pipe 14 is arranged at the left part of the dry-wet circulation working chamber 34, a heat preservation and insulation layer 15 is arranged between the electric heating pipe 14 and the dry-wet circulation working chamber 34, and the heat preservation and insulation layer 15 is made of aluminum silicate fiber heat preservation materials. The model of the temperature controller 10 is named as Hua accuse HSTL-PT100-M20, and the model of the electric fan 17 is named as JAKEL FASCO J238-112-11263.
The time control system 3 is mainly controlled by a time controller 9, the time controller 9 is integrated by a data processor, a timer, a display and a control panel, and is used as an information transmission center, and is respectively connected with a temperature controller 10, a water content controller 11 and a power supply/switch 7 by adopting conducting wires to uniformly control the whole test process.
The temperature control system 4 consists of a temperature controller 10 and a temperature sensor 19, wherein the temperature sensor 19 is arranged at the left side of a dry-wet circulation working chamber 34 and is connected with the temperature controller 10 through a transmission wire, the temperature controller 10 is integrated with a data processor, a display and a control panel into a whole and is connected with the temperature sensor 19 through a transmission wire to collect and process temperature sensor data, and meanwhile, the transmission wire is connected with an electric heating pipe 14 and an electric fan 17 to further control a hot air system 2, so that the temperature state in the dry-wet circulation working chamber 34 is monitored, regulated and controlled in real time; the temperature sensor 19 is a high-temperature high-precision platinum resistor pt100, the maximum measuring range is 110 ℃, and the measuring error is less than 0.1 ℃. The temperature sensor 19 is improved by a Hua control CH6 temperature controller.
The water content monitoring system 5 consists of a water content controller 11, a water inlet valve 30, a weighing sensor 25, a water content monitoring probe 35 and a weighing tray 23, wherein the water content monitoring probe 35 is arranged in a sample 36, and transmits measured water content data to the water content controller 11 in real time, the weighing tray 23 is connected with the weighing sensor 25 through a heat insulation ceramic pad, the weighing sensor 25 is connected with the water content controller 35 through a transmission wire, the water content controller is integrated into a whole through a data processor, a display and a control panel, and is connected with the weighing sensor 25 through the transmission wire to acquire and process the data of the weighing sensor 25, and can display and monitor the water content information of the sample in real time, and simultaneously control the on-off state of the water inlet valve 30 so as to control the dehumidification and humidification process of the sample; the weighing tray 23 is a tray made of stainless steel, four weighing sensors 25 are arranged below the weighing tray 23, the weighing sensors 25 are connected with the weighing tray 23 through high-strength heat-insulating ceramic pads, and the weighing tray 23 transmits the gravity of the movable tray frame to the weighing sensors 25; the weighing sensor 25 is a micro spoke type weighing sensor, the measuring range is 20-50kg, and the comprehensive precision is higher than 0.2% F.S. The water content controller 11 is improved by an Oulida AD2015D controller, and the model of the weighing sensor 25 is Oulida AT8106-20.
The test piece holding device 6 consists of a permeable stone 20, a tray frame 18 and trays 21, wherein the tray frame 18 is fixed at the position of the dry and wet circulation working chamber 34 which is 1/6-1/5 away from the bottom surface, the tray frame 18 adopts heat-resistant steel grids, the number of the trays 21 is 6, the trays are uniformly fixed on the tray frame 18, the shape and the size of the trays 21 can be selected according to rock and soil samples, and the permeable stone 20 is arranged on the trays 21.
While the invention has been described with respect to the preferred embodiments, it will be understood that the invention is not limited thereto, but is capable of modification and variation without departing from the spirit of the invention, as will be apparent to those skilled in the art.
Claims (9)
1. The automatic control rock soil dry-wet cycle test method is characterized by comprising the following steps of:
A. preparing a test sample, placing the test sample into a movable tray, switching on a power supply/switch of a dry-wet circulating device, and controlling the power supply states of a time control system, a temperature control system and a water content control system by the power supply/switch in an overall manner, wherein a time controller in the time control system controls the wetting and drying circulating states and the circulating times of the test sample; the temperature controller in the temperature control system directly controls the working states of the electric heating pipe and the electric fan, the electric heating pipe and the electric fan provide drying hot air for the dry-wet circulation working chamber, and the temperature in the dry-wet circulation working chamber is controlled in real time; the water content controller in the water content control system controls the water inlet valve of the water inlet and controls the water content of the sample in the dry-wet circulation working chamber in real time through feedback information of the water content monitoring probe and the weighing sensor;
B. inputting wet standing time, dry standing time and cycle times into a time controller instrument panel, setting initial working temperature of a dry-wet circulating device into the temperature controller instrument panel, and inputting dry state water content, wet state water content and total weight parameters of a sample into a water content controller instrument panel;
C. after corresponding data are set on instrument panels of the time controller, the temperature controller and the water content controller, the dry-wet circulating device starts to work, firstly, the water inlet valve is automatically opened, the water inlet speed is controlled, test water is slowly injected into the permeable stone through the water injection hose, the weighing sensor monitors the weight of a sample in the dry-wet circulating working chamber in real time, and when the total weight of the sample reaches a set value, the water content controller closes the water inlet valve and stops water injection;
D. after the water inlet valve is closed, the sample naturally absorbs water, a water content monitoring probe arranged in the sample monitors and feeds the water content information of the sample back to a water content controller, and when the water content reaches a set value, the water content controller sends a signal to a time controller, and the time controller starts to calculate wetting standing time;
E. when the set standing time is reached, the time controller sends a heating command to the temperature controller, the device automatically opens the air inlet valve and the air outlet valve, the hot air system starts to work, the temperature sensor monitors the temperature inside the dry-wet circulation working chamber in real time, temperature information is fed back to the temperature controller for processing and displaying, and the temperature controller dynamically adjusts the working state of the hot air system according to the difference between the working temperature and the real-time temperature;
F. when the total weight of the sample reaches a set value, the water content controller sends a command to the temperature controller, heating is stopped at the moment, natural cooling is performed, the water content monitoring probe monitors and feeds the water content information of the sample back to the water content controller, when the water content reaches the set value, the water content controller sends a signal to the time controller, the air inlet valve and the air outlet valve are closed, and the time controller starts to calculate the drying standing time; when the set standing time is reached, the time controller sends a command to the water content controller again, the water inlet valve is opened, and then the next cycle test is carried out until the whole cycle test is finished;
the automatic control rock soil dry and wet circulation test device used by the automatic control rock soil dry and wet circulation test method comprises a box body (1), a hot air system (2), a time control system (3), a temperature control system (4), a water content control system (5) and a test piece containing device (6), wherein the box body (1) is a square hollow box with a dry and wet circulation working chamber (34) arranged inside, and consists of the dry and wet circulation working chamber (34) and a shell of the box body (1); the hot air system (2) consists of a heating chamber (13), an electric fan (17) and an electric heating pipe (14), the time control system (3) is controlled by a time controller (9), the temperature control system (4) consists of a temperature controller (10) and a temperature sensor (19), and the water content monitoring system (5) consists of a water content controller (11), a water inlet valve (30), a weighing sensor (25), a water content monitoring probe (35) and a weighing tray (23); the test piece containing device (6) is placed in a dry-wet circulation working chamber (34) of the box body (1), the hot air system (2) is embedded in the left side of the dry-wet circulation working chamber (34), the time control system (3) is embedded in the left upper side of the shell of the box body (1), the temperature control system (4) is embedded in the lower part of the shell of the box body (1), and the water content control system (5) is embedded in the left lower side of the shell of the box body (1); the power supply/switch (7) is connected with a time controller (9) in the time control system (3), the time controller (9) is simultaneously connected with a temperature controller (10) in the temperature control system (4) and a water content controller (11) in the water content control system (5), the temperature controller (10) is respectively connected with a temperature sensor (19), an electric heating pipe (14) in the hot air system (2) and an electric fan (17), and the water content controller (11) in the water content monitoring system (5) is respectively connected with a water content monitoring probe (35), a water inlet valve (30) and a weighing sensor (25).
2. The automatic control rock soil dry-wet cycle test method according to claim 1, wherein aluminum silicate fiber heat insulation materials are filled between the dry-wet cycle working chamber (34) and the shell of the box body (1), the shell of the box body (1) is made of a thin steel plate, the dry-wet cycle working chamber (34) is made of a high-quality structural steel plate, an air exhaust pipeline air outlet (22) is formed in the upper portion of the dry-wet cycle working chamber (34), a side door is arranged on the front vertical face of the box body (1), an air outlet (27) is formed in the bottom end of the right side face, and a water inlet (24) and four supporting legs (28) are arranged at the bottom.
3. The automatic control rock soil dry-wet circulation test method according to claim 1, wherein an electric heating pipe (14) is vertically arranged in a heating chamber (13), an electric fan (17) is arranged at the lower side of the electric heating pipe (14) and is not connected with the electric heating pipe, the electric fan (17) is a low-noise high-temperature-resistant axial flow fan, impellers and a volute of the electric fan (17) are made of stainless steel, a main machine of the electric fan (17) is arranged at the left side of a box body (1), and an aluminum silicate fiber heat insulation material is arranged between the main machine of the electric fan (17) and the heating chamber (13); the electric heating pipe (14) is formed by arranging a plurality of heating pipes in parallel and is arranged at the left part of the dry-wet circulation working chamber (34), and a heat preservation and insulation layer (15) is arranged between the electric heating pipe (14) and the dry-wet circulation working chamber (34).
4. The automatic control rock soil dry and wet cycle test method according to claim 1, wherein the time controller (9) is integrated with a data processor, a timer, a display and a control panel, and is used as an information transmission center, and is respectively connected with the temperature controller (10), the water content controller (11) and the power supply/switch (7) by adopting conductive wires to uniformly control the whole test process.
5. The automatic control rock soil dry-wet circulation test method according to claim 1, wherein the temperature sensor (19) is arranged at the left side of the dry-wet circulation working chamber (34), the temperature sensor is connected with the temperature controller (10) through a transmission wire, the temperature controller (10) is integrated with the data processor, the display and the control panel into a whole, the temperature sensor data are collected and processed through the connection of the transmission wire and the temperature sensor (19), and meanwhile, the transmission wire is connected with the electric heating pipe (14) and the electric fan (17), so that the hot air system (2) is controlled, and the temperature state in the dry-wet circulation working chamber (34) is monitored and regulated in real time.
6. The automatic control rock soil dry and wet circulation test method according to claim 1, wherein the water content monitoring probe (35) is arranged in the sample (36), the measured water content data is transmitted to the water content controller (11) in real time, the weighing tray (23) is connected with the weighing sensor (25) through a heat insulation ceramic pad, the weighing sensor (25) is connected with the water content controller (11) through a transmission wire, the water content controller (11) is integrated with the weighing sensor (25) through a data processor, a display and a control panel, the data of the weighing sensor (25) is collected and processed through the transmission wire, and the water content information of the sample can be displayed and monitored in real time, meanwhile, the switching state of the water inlet valve (30) is controlled, and the dehumidification and humidification processes of the sample are controlled; the weighing tray (23) is a tray made of stainless steel, four weighing sensors (25) are arranged below the weighing tray (23), and the weighing tray (23) transmits the gravity of the movable bracket to the weighing sensors (25).
7. The automatic control rock soil dry-wet circulation test method according to claim 1, wherein the test piece containing device (6) is composed of a permeable stone (20), a tray frame (18) and a tray (21), the tray frame (18) is fixed at the position 1/6-1/5 of a dry-wet circulation working chamber (34) from the bottom surface, the tray frames (18) are made of heat-resistant steel grids, the number of the trays (21) is 6, the trays are uniformly fixed on the tray frame (18), the shape and the size of the tray (21) can be selected according to rock soil samples, and the permeable stone (20) is arranged on the tray (21).
8. The automatic control rock soil dry and wet cycle test method according to claim 1, wherein a reserved test interface (8) is arranged at the lowest part of the left side of the box body (1) and is used for testing rebound, stress and strain parameters of a sample.
9. The automatic control rock soil dry-wet cycle test method according to claim 5, wherein the temperature sensor (19) is of a high-temperature high-precision platinum resistor pt100 type, the maximum measuring range is 110 ℃, and the measuring error is less than 0.1 ℃.
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