CN114563124B - Calibration system with temperature compensation function and calibration method - Google Patents
Calibration system with temperature compensation function and calibration method Download PDFInfo
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- CN114563124B CN114563124B CN202210113242.6A CN202210113242A CN114563124B CN 114563124 B CN114563124 B CN 114563124B CN 202210113242 A CN202210113242 A CN 202210113242A CN 114563124 B CN114563124 B CN 114563124B
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- 239000011148 porous material Substances 0.000 claims abstract description 69
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L25/00—Testing or calibrating of apparatus for measuring force, torque, work, mechanical power, or mechanical efficiency
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/04—Measuring force or stress, in general by measuring elastic deformation of gauges, e.g. of springs
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- 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
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Abstract
The invention provides a high Wen Tuya force sensor system with a temperature compensation function and a calibration method thereof, comprising a high Wen Tuya force sensor, a high Wen Tu medium pore pressure sensor and a sensor calibration system. And (3) constructing a calibration coefficient table according to the relation among the monitored temperature, pressure difference and signal reading by optimizing the heating and stress structure of the sensor, and further determining the soil pressure or the pore pressure in the soil by using the temperature, the temperature field and the signal reading in the test. The invention has the advantages that the soil pressure and the pore pressure sensor in the soil can separate the influence of the thermal stress generated by temperature and temperature difference on the test result, and the error caused by slower gas heat transfer to the temperature stress compensation is reduced; the provided calibration device quantifies uncertain errors caused by temperature and temperature difference on heat dissipation of the sensor, and can remarkably improve the test precision of the soil pressure and the pore pressure sensor in the soil under the conditions of high temperature and heat convection.
Description
Technical Field
The invention belongs to the technical field of environmental geotechnical engineering, and particularly relates to a calibration system with a temperature compensation function and a calibration method.
Background
In the thermal evaporation displacement process of the organic contaminated soil, the soil can be subjected to thermal wet consolidation under the action of steam, so that the soil pressure is changed. Simultaneously, with the progress of the hot steaming process, liquid phase and organic matters in the soil can be gasified, so that the pore water vapor pressure in the soil is changed. Under the multiple actions of soil pressure, pore pressure and high temperature, the substance to be phase-changed in the soil can be in a critical state, so that the disclosure of the thermal evaporation displacement mechanism of the organic polluted soil is greatly restricted. Therefore, it is necessary to provide reliable soil pressure and pore pressure testing techniques to achieve measurements of soil pressure and pore pressure in the soil at high temperatures. The conventional strain sensor is to attach a strain element to a diaphragm, and determine the soil pressure or pore water pressure by using the calibration relation between the micro deformation of the diaphragm and the electric signal. Under the action of high temperature, the strain element, the diaphragm and the sensor are integrally affected by thermal deformation, and then the diaphragm is slightly deformed under the action of load; thus, the micro-deformation of the diaphragm under the action of high temperature cannot be distinguished as being caused by temperature or load, and the soil pressure or pore water pressure cannot be determined through the micro-deformation signal. Meanwhile, the existing high temperature resistant force sensor is used for measuring a load value (kN), the pressure of soil and the pore pressure are pressure values (kPa), and the load value is converted according to the stress area so as not to meet the requirement of the soil body on representing the size of a voxel. In addition, the pressure sensor with the temperature compensation function partially eliminates the influence of the thermal pressure by measuring the temperature of the solid diaphragm and measuring the thermal stress reading value at the temperature, however, the air thermal effect on the inner side of the solid diaphragm obviously influences the temperature measuring and reading accuracy, and particularly, when the sensor is in contact with different temperature differences of stressed measurement and unstressed measurement, the test reading is greatly influenced. Some high temperature resistant sensors with heat dissipation modules only solve the influence of a high Wen Duichuan sensor signal module, and cannot overcome the influence of temperature difference between a stressed side and a non-stressed side caused by heat dissipation on the test result of the high temperature resistant sensor.
In the research of the organic contaminated soil thermal evaporation displacement test, a strain element is stuck on a diaphragm by a strain sensor in the prior art, and the soil pressure or pore water pressure is determined by utilizing the calibration relation between the micro-deformation of the diaphragm and an electric signal, so that the mode can cause the technical defect of inaccurate measurement and reading of a final temperature value;
therefore, for the research technology of the organic contaminated soil thermal evaporation displacement test, when the sensor is in contact with different temperature differences in stress measurement and non-stress measurement, how to overcome the influence of the temperature difference between the stress side and the non-stress side caused by heat dissipation on the test result of the high temperature resistant sensor is a technical problem to be solved by the person skilled in the art.
Disclosure of Invention
The calibration system with the temperature compensation function provided by the invention is used for at least solving the technical problems;
in order to solve the above problems, a first aspect of the present invention provides a calibration system with a temperature compensation function, which includes a high Wen Tuya force sensor, a high Wen Tu pore pressure sensor, a temperature-resistant transmitter, and a sensor calibration system; the high-temperature soil pressure sensor includes: an elastic diaphragm assembly, a pressure guiding cavity and a temperature-resistant transmitter; the elastic membrane block is an integrally formed round cover, the bearing top surface of the elastic membrane block is a high-elasticity membrane, and fine threads are arranged on the inner side of the elastic membrane block; the pressure guiding cavity consists of an external thread at the front end, a mounting thread and a mounting nut head, the middle end of the pressure guiding cavity is provided with an internally and externally through threaded pore canal which is convenient for pouring temperature-resistant fluid in the pressure guiding cavity, the internally and externally through threaded pore canal is respectively sealed by a temperature measuring probe and a plug, and the tail end of the pressure guiding cavity is provided with a threaded pore site of a temperature-resistant transmitter; the diversion cabin in the pressure guiding cavity is communicated with the 2 threaded pore canals at the upper part of the middle end and the threaded hole at the tail end; the upper part of the temperature-resistant transmitter is provided with a temperature measuring probe; connecting the fine thread on the inner side of the elastic membrane module with the external thread on the front end of the pressure guiding cavity, and connecting the thread hole on the tail end of the pressure guiding cavity with the temperature-resistant transmitter; filling the temperature-resistant fluid into the diversion cabin through one threaded pore canal until the temperature-resistant fluid flows out of the other threaded pore canal; screwing the temperature measuring probe into the threaded hole channel and screwing the plug into the other threaded hole channel, reserving a space to be screwed with 2-3 wires, immersing the high Wen Tuya force sensor to be completed into the temperature-resistant fluid, screwing the plug, and taking out the high Wen Tuya force sensor from the temperature-resistant fluid; the high Wen Tu pore pressure sensor includes: hole pressure elastic membrane block, pressure guiding cavity and temperature resistant transmitter; the inner side of the pore pressure elastic membrane module is provided with fine threads, the outer side of the pore pressure elastic membrane module is provided with a water permeable plate installation position, and a high-elasticity membrane is arranged below the water permeable plate installation position; the water permeable plate is arranged on the water permeable plate installation position, and a gap with the height of 1 mm-2 mm is reserved between the water permeable plate and the high-elasticity membrane; connecting the hole pressure elastic membrane block with external threads at the front end of the pressure guide cavity, and connecting the threaded hole position at the tail end of the pressure guide cavity with a temperature-resistant transmitter; filling the temperature-resistant fluid into the diversion cabin of the pressure guiding cavity through one threaded pore canal until the temperature-resistant fluid flows out of the other threaded pore canal; screwing the temperature measuring probe into the threaded hole channel and screwing the plug into the other threaded hole channel and reserving a space to be screwed with 2-3 wires, and then immersing the pore pressure sensor in the high Wen Tu to be completed into the temperature-resistant fluid and taking out the temperature-resistant fluid after screwing the plug; the sensor calibration system comprises: the system comprises a temperature and pressure control box, a convection heat dissipation control box, a servo pressure generator, a constant-temperature circulating water bath, an air supply temperature control system, a return air temperature control system and a signal acquisition system; the outside of the warm-pressing control box and the convection heat dissipation control box are provided with heat preservation plates, and the warm-pressing control box and the convection heat dissipation control box are communicated through mounting threaded holes; the temperature and pressure control box is internally provided with a circulating coil pipe and is filled with temperature-resistant fluid; the upper part of the temperature and pressure control box is provided with a quick connector port and a liquid outlet port so as to facilitate circulation of temperature-resistant fluid through the quick connector port and the liquid outlet port to fill the temperature and pressure control box; the upper part and the lower part in the convection heat radiation control box are respectively provided with a temperature control air supply opening and an air return opening, wherein the temperature control air supply opening is connected with an external air supply temperature control system, and the air return opening is connected with an external air return temperature control system; the temperature-resistant transmitter and the data wires of the temperature probes are connected with the signal acquisition system through the outgoing line sealing port of the convection heat dissipation control box body door; the high temperature soil pressure sensor or the high Wen Tu pore pressure sensor is connected with the mounting threaded hole by the mounting thread, and the servo pressure generator is controlled to pour the temperature-resistant fluid into the temperature-pressure control box through the quick connector until the liquid outlet continuously discharges the temperature-resistant fluid, so that the liquid outlet is closed, and the box door of the convection heat dissipation control box is closed.
In a second aspect, the present invention provides a calibration method of a calibration system of a temperature compensation function, the method being applied to the calibration system of the temperature compensation function, the method comprising the steps of: 1) Assembling the sensor calibration system; 2) Temperature T of temperature-resistant fluid in temperature-pressure control box is controlled through constant-temperature circulating water bath and circulating coil pipe i Controlling pressure P of a temperature-resistant fluid by a servo pressure generator j Temperature T in the convection heat dissipation control box is controlled through a temperature control air supply outlet and an air return outlet which are respectively connected with an air supply temperature control system and an air return temperature control system k And convection heat dissipation capacity H n The method comprises the steps of carrying out a first treatment on the surface of the 3) T to be controlled in step 2) i 、P j 、T k 、H n After stabilization, record the transmissionThe temperature value T of the high Wen Tuya force sensor or the high Wen Tu pore pressure sensor connected with the sensor calibration system (5) t 、T o Sum signal value S g The method comprises the steps of carrying out a first treatment on the surface of the 4) Repeating the operation procedures of the steps 2) and 3), and developing different T i 、P j 、T k 、H n T under the condition t 、T o 、S g And according to the determined T i 、P j 、T k 、H n And T read out t 、T o 、S g Drawing a calibration signal table of the high Wen Tuya force sensor or the high Wen Tu pore pressure sensor installed in the step 1); 5) The sensor can be determined to be at different T according to the calibration signal table determined in the step 4) i 、P j 、T k 、H n T of (2) t 、T o 、S g Numerical value, T measured in use of sensor t 、T o 、S g The pore pressure P in the soil and the soil can be determined by inquiring the calibration signal table by the numerical value j The method comprises the steps of carrying out a first treatment on the surface of the Temperature compensation of soil pressure and pore pressure in the soil is performed according to formula (1), wherein formula (1) is:
in the formula (1), D T1 、D T2 Respectively T 1 、T 2 Bending stiffness of the high-elasticity diaphragm and the high-temperature-resistant transmitter diaphragm at temperature; B. c is a constant parameter respectively; r is the radius of the high-elasticity membrane; r—radius of high temperature resistant transducer diaphragm; p (P) 0 The stress is acquired when no pressure load exists at a fixed temperature; p (P) c Is the acquisition stress when the pressure load is applied at a fixed temperature; p (P) s Is soil pressure or pore pressure in the soil.
The beneficial effects are that: the invention provides a calibration system with a temperature compensation function and a calibration method, which can completely determine three-dimensional stress states, three-dimensional effective stress states, three-dimensional displacement states, temperatures, water contents, electric conductivity and Ph values of the measuring points of a geotechnical structure of a landfill, and can provide values for stability analysis, transient deformation analysis, accumulated deformation analysis, analysis of the geotechnical structure of the landfill and analysis of the temperature field and the water division field based on the test values of different measuring points, thereby providing convenience for safety evaluation of the geotechnical structure of the landfill.
Drawings
In order to more clearly illustrate the embodiments of the present description or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic illustration of a high Wen Tuya force sensor of the present invention;
FIG. 2 is a schematic illustration of a high Wen Tu intermediate pore pressure sensor of the present invention;
FIG. 3 is a schematic diagram of a sensor calibration system according to the present invention.
Reference numerals illustrate:
1. an elastic membrane block;
2. a pressure guiding cavity;
3. a temperature resistant transmitter;
4. hole pressing elastic membrane block;
5. a sensor calibration system;
11. a high elastic membrane;
12. fine thread;
20. installing a thread;
21. an external thread;
22. installing a nut head;
23. a diversion cabin;
24. a threaded bore;
25. a threaded hole site;
26. a temperature measurement probe;
27. a plug;
41. the water permeable plate installation position;
42. a water permeable plate;
50. thermal insulation board
51. A temperature and pressure control box;
52. a convection heat dissipation control box;
53. installing a threaded hole;
54. a quick connector port;
55. a servo pressure generator;
56. a circulation coil;
57. constant temperature circulating water bath;
58. a temperature-controlled air supply port;
59. a wind-feeding temperature control system;
510. an air return port;
511. a return air temperature control system;
512. box door
513. A wire outlet sealing port;
514. a signal acquisition system;
541. and a liquid outlet.
Detailed Description
The following description of the embodiments of the present invention will be made more apparent and fully hereinafter with reference to the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which are derived by a person skilled in the art based on the embodiments of the invention, fall within the scope of protection of the invention.
Meanwhile, in the embodiment of the present specification, when an element is referred to as being "fixed to" another element, it may be directly on the other element or may be present with an intervening element. When a component is considered to be "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. The terms "vertical", "horizontal", "left", "right" and the like are used in the embodiments of the present specification for the purpose of illustration only and are not intended to limit the present invention.
Embodiment one:
as shown in fig. 1-3, the first embodiment provides a calibration system with a temperature compensation function, which is based on the following principle: and (3) constructing a calibration coefficient table according to the relation among the monitored temperature, pressure difference and signal reading by optimizing the heating and stress structure of the sensor, and further determining the soil pressure or the pore pressure in the soil by using the temperature, the temperature field and the signal reading in the test.
Specifically, the calibration system with the temperature compensation function is shown in fig. 1, 2 and 3. The method specifically comprises the following steps: the sensor comprises a high Wen Tuya force sensor, a high Wen Tu middle pore pressure sensor, a temperature resistant transmitter 3 and a sensor calibration system 5; the high-temperature soil pressure sensor includes: an elastic diaphragm assembly 1, a pressure guide cavity 2 and a temperature-resistant transmitter 3; the elastic membrane module 1 is a round cover formed integrally, the bearing top surface of the elastic membrane module is a high-elasticity membrane 11, and fine threads 12 are arranged on the inner side of the elastic membrane module; the pressure guiding cavity 2 consists of an external thread 21 at the front end, a mounting thread 20 and a mounting nut head 22, 2 internally and externally through threaded pore canals 24 are arranged at the middle end of the pressure guiding cavity 2, so that temperature-resistant fluid is conveniently poured into the pressure guiding cavity 2, the 2 internally and externally through threaded pore canals 24 are respectively sealed by a temperature measuring probe 26 and a plug 27, and a threaded pore site 25 of a temperature-resistant transmitter 3 is arranged at the tail end of the pressure guiding cavity 2; the diversion cabin 23 in the diversion cavity 2 is communicated with the 2 threaded pore canals 24 at the upper part of the middle end and the threaded pore position 25 at the tail end; the upper part of the temperature-resistant transmitter 3 is provided with a temperature measuring probe 26; the fine thread 12 on the inner side of the elastic membrane module 1 is connected with the external thread 21 on the front end of the pressure guiding cavity 2, and the thread hole site 25 on the tail end of the pressure guiding cavity 2 is connected with the temperature-resistant transmitter 3; filling the temperature-resistant fluid into the diversion pod 23 through one threaded hole 24 until the temperature-resistant fluid flows out of the other threaded hole 24; screwing the temperature measuring probe 26 into the threaded hole 24 and screwing the plug 27 into the other threaded hole 24 and reserving a space to be screwed with 2-3 wires, sinking the to-be-completed high Wen Tuya force sensor into the temperature-resistant fluid, screwing the plug 27, and taking out the to-be-completed high Wen Tuya force sensor from the temperature-resistant fluid to form the high Wen Tuya force sensor;
the high Wen Tu pore pressure sensor includes: the hole pressure elastic membrane module 4, the pressure guide cavity 2 and the temperature-resistant transmitter 3; the inner side of the pore pressure elastic membrane block 4 is provided with fine threads 12, the outer side is provided with a water permeable plate mounting position 41, and a high elastic membrane 11 is arranged below the water permeable plate mounting position; the water permeable plate 42 is arranged on the water permeable plate mounting position 41, and a gap with the height of 1 mm-2 mm is reserved between the water permeable plate 42 and the high elastic membrane 11; connecting the hole pressure elastic membrane block 4 with external threads 21 at the front end of the pressure guiding cavity 2, and connecting a threaded hole site 25 at the tail end of the pressure guiding cavity 2 with the temperature-resistant transmitter 3; filling temperature-resistant fluid into the diversion chamber 23 of the pressure guiding cavity 2 through one threaded hole 24 until the temperature-resistant fluid flows out of the other threaded hole 24; screwing the temperature measuring probe 26 into the threaded hole 24 and screwing the plug 27 into the other threaded hole 24 and reserving a space to be screwed for 2-3 wires, immersing the to-be-completed high Wen Tu pore pressure sensor into a temperature-resistant fluid, screwing the plug 27, and taking out the to-be-completed high Wen Tuya pressure sensor from the temperature-resistant fluid;
the sensor calibration system 5 includes: a temperature and pressure control box 51, a convection heat dissipation control box 52, a servo pressure generator 55, a constant temperature circulating water bath 57, an air supply temperature control system 59, a return air temperature control system 511 and a signal acquisition system 514; the outside of the temperature and pressure control box 51 and the convection heat dissipation control box 52 is provided with a heat insulation board 50, and the temperature and pressure control box 51 and the convection heat dissipation control box 52 are communicated through an installation threaded hole 53; the temperature and pressure control box 51 is internally provided with a circulating coil 56 and is filled with temperature-resistant fluid; the upper part of the temperature and pressure control box 51 is provided with a quick connector port 54 and a liquid outlet 541 so that the temperature and pressure control box 51 can be filled with temperature-resistant fluid in a circulating way through the quick connector port 54 and the liquid outlet 541; the upper part and the lower part in the convection heat radiation control box 52 are respectively provided with a temperature control air supply opening 58 and an air return opening 510, wherein the temperature control air supply opening 58 is connected with an external air supply temperature control system 59, and the air return opening 510 is connected with an external air return temperature control system 511; the temperature-resistant transmitter 3 and the data wires of the 2 temperature probes 26 are connected with a signal acquisition system 514 through an outgoing wire sealing port 513 of a box body door 512 of the convection heat dissipation control box 52; connecting the mounting screw thread 20 of the high Wen Tuya force sensor or the high Wen Tu pore pressure sensor with the mounting screw hole 53, controlling the servo pressure generator 55 to fill the temperature-resistant fluid into the temperature-pressure control box 51 through the quick connector port 54, and closing the liquid outlet 541 until the liquid outlet 541 continuously discharges the temperature-resistant fluid; closing the cabinet door 512 of the convection heat dissipation control cabinet 52; i.e. the sensor calibration system 5 is formed.
Embodiment two:
the second embodiment of the present invention proposes that the method includes the following steps:
1) Assembling the sensor calibration system 5;
2) Temperature T of temperature-resistant fluid in temperature-pressure control box 51 is controlled by constant-temperature circulating water bath 57 and circulating coil 56 i Pressure P of the temperature-resistant fluid is controlled by servo pressure generator 55 j The temperature T in the convection heat dissipation control box 52 is controlled through a temperature control air supply port 58 and an air return port 510 which are respectively connected with an air supply temperature control system 59 and an air return temperature control system 511 k And convection heat dissipation capacity H n ；
3) T to be controlled in step 2) i 、P j 、T k 、H n After stabilization, the temperature value T of the high Wen Tuya force sensor or the high Wen Tu pore pressure sensor connected with the sensor calibration system 5 is recorded t 、T o Sum signal value S g ；
4) Repeating the operation procedures of the steps 2) and 3), and developing different T i 、P j 、T k 、H n T under the condition t 、T o 、S g And according to the determined T i 、P j 、T k 、H n And T read out t 、T o 、S g Drawing a calibration signal table of the high Wen Tuya force sensor or the high Wen Tu pore pressure sensor installed in the step 1);
5) The sensor can be determined to be at different T according to the calibration signal table determined in the step 4) i 、P j 、T k 、H n T of (2) t 、T o 、S g Numerical value, T measured in use of sensor t 、T o 、S g The pore pressure P in the soil and the soil can be determined by inquiring the calibration signal table by the numerical value j ；
The other implementation method is as follows:
temperature compensation of soil pressure and pore pressure in the soil is performed according to formula (1), wherein formula (1) is:
in the formula (1), D T1 、D T2 Respectively bending rigidity of the high-elasticity diaphragm 11 and the high-temperature-resistant transducer 3 at a fixed temperature; B. c is a constant parameter respectively; r is the radius of the high-elasticity membrane 11; r is the radius of the membrane of the high-temperature resistant transmitter 3; p (P) 0 The stress is acquired when no pressure load exists at a fixed temperature; p (P) c Is the acquisition stress when the pressure load is applied at a fixed temperature; p (P) s Is soil pressure or pore pressure in the soil.
The technical principle of formula (1) is deduced as follows:
based on the integrated structural form of the sensor, the electrical signal errors caused by the two forms of thermal expansion and compression of the temperature-resistant fluid and the bending rigidity of the high-elasticity diaphragm 11 and the diaphragm of the temperature-resistant transmitter 3 along with the temperature change are considered. The thermal expansion and compression control equation of the temperature-resistant fluid adopts the Tiat equation, namely:
wherein P is c Is the acquisition stress when the pressure load is applied at a fixed temperature; p (P) 0 The stress is acquired when no soil pressure load exists at a fixed temperature; B. c is a constant parameter at a constant temperature; dV is the saturated volume change of the temperature-resistant fluid at a fixed temperature.
The high-elasticity diaphragm 11 or the temperature-resistant transducer 3 can be pressed to deform, and the radial deflection deformation of the diaphragm is as follows:
wherein P is the axial stress to which the high-elasticity diaphragm 11 or the temperature-resistant transducer 3 is subjected; d is the bending rigidity of the high-elasticity diaphragm 11 and the diaphragm of the temperature-resistant transmitter 3; r is the total radius of the high-elasticity diaphragm 11 or the diaphragm of the temperature-resistant transmitter 3; and r is the radius of the high-elasticity diaphragm 11 or the diaphragm of the temperature-resistant transmitter 3 at the deflection deformation.
Temperature can cause materialPoisson's ratio and modulus change, will have a corresponding bending stiffness D at a specific temperature T The method comprises the steps of carrying out a first treatment on the surface of the Integrating the formula (3) along the radius, the envelope volume of the deformation of the diaphragm can be obtained as follows:
the total volume change of the pressure guiding cavity 2 at a specific temperature is the sum of the deformation envelope volumes of the high-elasticity diaphragm 11 or the diaphragm of the temperature-resistant transmitter 3, namely dV=dV 1 +dV 2 The method comprises the steps of carrying out a first treatment on the surface of the From the formula (4), dV 1 And dV 2 The method comprises the following steps of:
wherein dV 1 A deformation envelope volume for the highly elastic membrane 11; dV (dV) 2 The deformation envelope volume of the membrane of the temperature-resistant transmitter 3; d (D) T1 、D T2 Respectively bending rigidity of the high-elasticity diaphragm 11 and the high-temperature-resistant transducer 3 at a fixed temperature; r is R 1 A radius of the high elastic membrane 11; r is R 2 The radius of the diaphragm of the high-temperature-resistant transmitter 3; p (P) 0 The stress is acquired when no pressure load exists at a fixed temperature; p (P) c Is the acquisition stress when the pressure load is applied at a fixed temperature; p (P) s Is soil pressure or pore pressure in the soil;
substituting the formulas (5) and (6) into the formula (2) simultaneously to obtain a relation formula of soil pressure or pore pressure in soil and signal value at a fixed temperature, wherein the formula is as follows:
in addition, the sensor also has an effect of heat convection, and equation (7) can be expressed as:
at this time, the temperature compensation range includes three errors of thermal expansion and compression of the temperature-resistant fluid, bending rigidity of the metal diaphragm and convection of external environment heat when the temperature is changed.
In general, the technical solution of the second embodiment has the following technical effects: 1. the provided soil pressure and soil pore pressure sensor can separate the influence of thermal stress generated by temperature difference on a test result; 2. the provided pressure guide cavity reduces errors caused by slower gas heat transfer to temperature stress compensation; 3. the calibration device provided quantifies uncertainty errors caused by temperature and temperature differences in heat dissipation of the sensor.
Since the second embodiment and the first embodiment are an embodiment under the same inventive concept, the partial structures thereof are completely the same, and therefore, the structure substantially the same as that of the first embodiment in the second embodiment is not described in detail, and the detailed description thereof is omitted herein.
Finally, it should be noted that: the above examples are only specific embodiments of the present invention, and are not intended to limit the scope of the present invention, but it should be understood by those skilled in the art that the present invention is not limited thereto, and that the present invention is described in detail with reference to the above examples: any person skilled in the art may modify or easily conceive of the technical solution described in the foregoing embodiments, or perform equivalent substitution of some of the technical features, while remaining within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit of the corresponding technical solutions. Are intended to be encompassed within the scope of the present invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.
Although embodiments of the present invention have been disclosed above, it is not limited to the details and embodiments shown and described, it is well suited to various fields of use for which the invention would be readily apparent to those skilled in the art, and accordingly, the invention is not limited to the specific details and illustrations shown and described herein, without departing from the general concepts defined in the claims and their equivalents.
Claims (2)
1. A calibration system with a temperature compensation function comprises a high Wen Tuya force sensor, a high Wen Tu pore pressure sensor, a temperature-resistant transmitter (3) and a sensor calibration system (5); the method is characterized in that:
the high-temperature soil pressure sensor includes: the device comprises an elastic diaphragm assembly (1), a pressure guide cavity (2) and a temperature-resistant transmitter (3); the elastic membrane block (1) is a round cover formed integrally, the bearing top surface of the elastic membrane block is a high-elasticity membrane (11), and fine threads (12) are arranged on the inner side of the elastic membrane block; the pressure guiding cavity (2) consists of an external thread (21) at the front end, a mounting thread (20) and a mounting nut head (22), 2 internally and externally through threaded pore canals (24) are arranged at the middle end of the pressure guiding cavity (2) so as to be convenient for pouring temperature-resistant fluid in the pressure guiding cavity (2), the 2 internally and externally through threaded pore canals (24) are respectively sealed by a temperature measuring probe (26) and a plug (27), and a threaded pore site (25) of a temperature-resistant transmitter (3) is arranged at the tail end of the pressure guiding cavity (2); the diversion cabin (23) in the diversion cavity (2) is communicated with the 2 threaded pore canals (24) at the upper part of the middle end and the threaded pore sites (25) at the tail end; the upper part of the temperature-resistant transmitter (3) is provided with a temperature measuring probe (26); the fine thread (12) on the inner side of the elastic membrane block (1) is connected with the external thread (21) on the front end of the pressure guiding cavity (2), and the thread hole site (25) on the tail end of the pressure guiding cavity (2) is connected with the temperature-resistant transmitter (3); filling a temperature-resistant fluid into the diversion cabin (23) through one threaded hole channel (24) until the temperature-resistant fluid flows out of the other threaded hole channel (24); screwing a temperature measuring probe (26) into the threaded hole channel (24) and screwing, screwing a plug (27) into the other threaded hole channel (24) and reserving a space to be screwed of 2-3 wires, and then immersing the high-temperature soil pressure sensor into the temperature-resistant fluid and taking out the high-temperature-resistant fluid after screwing the plug (27);
the high Wen Tu pore pressure sensor includes: the device comprises a hole pressure elastic membrane block (4), a pressure guide cavity (2) and a temperature-resistant transmitter (3); the inner side of the pore pressure elastic membrane block (4) is provided with fine threads (12), the outer side of the pore pressure elastic membrane block is provided with a water permeable plate mounting position (41), and a high elastic membrane (11) is arranged below the water permeable plate mounting position; the water permeable plate (42) is arranged on the water permeable plate mounting position (41) and a gap with the height of 1 mm-2 mm is reserved between the water permeable plate (42) and the high-elasticity membrane (11); connecting the hole pressure elastic membrane block (4) with an external thread (21) at the front end of the pressure guiding cavity (2), and connecting a thread hole site (25) at the tail end of the pressure guiding cavity (2) with the temperature-resistant transmitter (3); filling a temperature-resistant fluid into a diversion cabin (23) of the pressure guiding cavity (2) through one threaded hole channel (24) until the temperature-resistant fluid flows out of the other threaded hole channel (24); screwing a temperature measurement probe (26) into a threaded hole channel (24) and screwing, screwing a plug (27) into another threaded hole channel (24) and reserving a space to be screwed of 2-3 wires, immersing a pore pressure sensor in the high Wen Tu into the temperature-resistant fluid, screwing the plug (27), and taking out the temperature-resistant fluid;
the sensor calibration system (5) comprises: the system comprises a temperature and pressure control box (51), a convection heat dissipation control box (52), a servo pressure generator (55), a constant-temperature circulating water bath (57), an air supply temperature control system (59), a return air temperature control system (511) and a signal acquisition system (514); the outside of the warm-pressing control box (51) and the convection heat dissipation control box (52) is provided with a heat insulation board (50), and the warm-pressing control box (51) and the convection heat dissipation control box (52) are communicated through an installation threaded hole (53); a circulating coil pipe (56) is arranged in the temperature and pressure control box (51) and is filled with temperature-resistant fluid; the upper part of the temperature and pressure control box (51) is provided with a quick connector port (54) and a liquid outlet port (541) so as to facilitate circulation of temperature-resistant fluid through the quick connector port (54) and the liquid outlet port (541) to fill the temperature and pressure control box (51); the upper part and the lower part in the convection heat radiation control box (52) are respectively provided with a temperature control air supply opening (58) and an air return opening (510), wherein the temperature control air supply opening (58) is connected with an external air supply temperature control system (59), and the air return opening (510) is connected with an external air return temperature control system (511); the data wires of the temperature-resistant transmitter (3) and the 2 temperature measuring probes (26) are connected with the signal acquisition system (514) through the wire outlet sealing port (513) of the box body door (512) of the convection heat radiation control box (52); the mounting screw thread (20) of the high-temperature soil pressure sensor or the pore pressure sensor in the height Wen Tu is connected with the mounting screw hole (53), and the servo pressure generator (55) is controlled to pour the temperature-resistant fluid into the temperature-pressure control box (51) through the quick-plug connector port (54) until the liquid outlet (541) continuously discharges the temperature-resistant fluid, so that the liquid outlet (541) is closed, and the box body door (512) of the convection heat dissipation control box (52) is closed.
2. A method for calibrating a temperature compensation function calibration system, characterized in that the method is applied to the temperature compensation function calibration system of claim 1, the method comprising the steps of:
1) Assembling the sensor calibration system (5) of claim 1;
2) The temperature T of the temperature-resistant fluid in the temperature-pressure control box (51) is controlled by a constant-temperature circulating water bath (57) and a circulating coil pipe (56) i Pressure P of temperature-resistant fluid is controlled by servo pressure generator (55) j Temperature T in the convection heat dissipation control box (52) is controlled through a temperature control air supply opening (58) and an air return opening (510) which are respectively connected with an air supply temperature control system (59) and an air return temperature control system (511) k And convection heat dissipation capacity H n ；
3) T to be controlled in step 2) i 、P j 、T k 、H n After stabilization, the temperature value T of the high Wen Tuya force sensor or the high Wen Tu pore pressure sensor connected with the sensor calibration system (5) is recorded t 、T o Sum signal value S g ；
4) Repeating the operation procedures of the steps 2) and 3), and developing different T i 、P j 、T k 、H n T under the condition t 、T o 、S g And according to the determined T i 、P j 、T k 、H n And T read out t 、T o 、S g Drawing a calibration signal table of the high Wen Tuya force sensor or the high Wen Tu pore pressure sensor installed in the step 1);
5) The high-temperature soil pressure sensor or the high Wen Tu pore pressure sensor can be determined to be at different T according to the calibration signal table determined in the step 4) i 、P j 、T k 、H n T of (2) t 、T o 、S g Numerical value, the heightWen Tuya force sensor or said high Wen Tu pore pressure sensor through measured T during use t 、T o 、S g The pore pressure P in the soil and the soil can be determined by inquiring the calibration signal table by the numerical value j ；
Temperature compensation of soil pressure and pore pressure in the soil is performed according to formula (1), wherein formula (1) is:
in the formula (1), D T1 、D T2 Respectively T 1 、T 2 Bending stiffness of the high-elasticity diaphragm (11) and the high-temperature-resistant transducer (3) diaphragms at temperature; B. c is a constant parameter respectively; r is the radius of the high-elasticity membrane (11); r-radius of diaphragm of high temperature resistant transducer (3); p (P) 0 The stress is acquired when no pressure load exists at a fixed temperature; p (P) c Is the acquisition stress when the pressure load is applied at a fixed temperature; p (P) s Is soil pressure or pore pressure in the soil.
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| CN102519666A (en) * | 2011-12-29 | 2012-06-27 | 中国燃气涡轮研究院 | Digital temperature compensation system and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US3456509A (en) * | 1966-06-20 | 1969-07-22 | Petur Thordarson | Pore pressure |
| JPS61165629A (en) * | 1985-01-18 | 1986-07-26 | Kyowa Electronic Instr Corp Ltd | Earth pressure sensor |
| CN105352641B (en) * | 2015-10-21 | 2018-02-09 | 上海交通大学 | The device and its installation method of section of jurisdiction soil pressure and pore water pressure can be monitored simultaneously |
| CN109001421A (en) * | 2018-05-30 | 2018-12-14 | 西南交通大学 | A kind of soil pressure and monitoring pore water pressure device |
| CN110118631B (en) * | 2019-06-12 | 2020-09-29 | 中国地震局工程力学研究所 | Pore water pressure meter calibration method and system |
| CN110542499A (en) * | 2019-10-10 | 2019-12-06 | 深圳市基础工程有限公司 | Fiber grating soil pressure sensor with temperature compensation function |
| CN111272635A (en) * | 2020-03-16 | 2020-06-12 | 中国科学院武汉岩土力学研究所 | Rock porosity and permeability combined test device and test method under triaxial condition |
| CN212568292U (en) * | 2020-04-27 | 2021-02-19 | 中建东设岩土工程有限公司 | Cold region soil body multidirectional stress field water-heat-force coupling soil pressure testing device |
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