Anchoring body corrosion test system and method under multi-field coupling effect

Abstract

The invention provides an anchoring body corrosion test system and method under a multi-field coupling effect, and belongs to the technical field of anchoring body corrosion tests.The anchoring body corrosion test system comprises a temperature control module, a corrosion solution circulation module, a deformation measurement module, a prestress loading module and a data processing module; according to the invention, radial deformation monitoring is converted into circumferential deformation monitoring through the deformation measurement module, so that the problem of corrosion damage of a corrosion solution to a sensor is solved, and automatic monitoring of sample deformation in a corrosion environment is realized; automatic control over temperature accelerated corrosion and automatic adjustment of solution concentration are achieved, the corrosion process can be analyzed in real time, and finally, the service life of an anchoring body is predicted through a data processing module by adopting an anchoring body sample failure comprehensive life prediction model. The system can be applied to expansion deformation monitoring and failure prediction of the anchoring body in the corrosion process of the anchoring body under the multi-field coupling effect.

Description

Technical Field

[0001] The present invention relates to the technical field of anchor solid corrosion tests, and particularly to an anchor solid corrosion test system and method under the action of multi-field coupling. Background Art

[0002] Prestressed anchorage structures are widely used in the fields of water conservancy and hydropower, transportation, mines, etc. in China. In anchorage engineering examples, due to the complex and changeable application environments, the number of cases where the anchorage structures fail is increasing and cannot be ignored. Especially, the dry-wet alternating environment caused by seasonal water level fluctuations, as well as the temperature differences between winter and summer, form a multi-field coupling environment (temperature - water - stress - chemistry), which accelerates the corrosion process of the anchorage structures. At the same time, the rust expansion of the anchor cables causes the cracking of the mortar inclusions, forming a vicious cycle for the corrosion process.

[0003] The existing anchor solid corrosion test technologies have the following main problems: First, the sensors are directly immersed in the corrosion solution, which easily leads to the corrosion of the sensors themselves, thereby affecting the measurement accuracy and stability. Second, the existing technologies usually lack an effective multi-field coupling environment control system and cannot achieve precise regulation of temperature, dry-wet cycle, concentration of erosive ions, etc., resulting in poor correlation between the corrosion test results and multiple factors. In addition, the existing technologies fail to realize the automatic monitoring of the multi-factor accelerated corrosion process, making the data collection untimely and incomplete, affecting the real-time analysis of the corrosion process. At the same time, due to the lack of systematic data analysis means, the existing technologies are difficult to accurately predict the service life of the anchor solid, restricting the selection of safety assessment and protection means in the anchorage engineering. Summary of the Invention

[0004] To solve the above problems in the existing technologies, the present invention provides an anchor solid corrosion test system and method under the action of multi-field coupling. The invention converts the radial deformation monitoring into circumferential deformation monitoring through a deformation measurement module, solves the problem of corrosion damage of the sensors by the corrosion solution, and realizes the automatic monitoring of the deformation of the specimen in the corrosion environment. Secondly, through the temperature control module and the corrosion solution circulation module, the automatic control of temperature-accelerated corrosion and the automatic adjustment of the solution concentration are realized, and the corrosion process can be analyzed in real time. Finally, through the data processing module, using the comprehensive life prediction model of the anchor solid specimen failure, the service life of the anchor solid is predicted. To achieve the above object, the technical solution is as follows:

[0005] On the one hand, the present invention provides an anchor solid corrosion test system under the action of multi-field coupling, and the system includes:

[0006] A temperature control module, used to provide a set temperature environment for the anchor solid specimen;

[0007] A corrosion solution circulation module, used to provide a dry-wet alternating corrosion environment for the anchor solid specimen;

[0008] The deformation measurement module is used to measure the cracking deformation of the anchor solid specimen during the corrosion process;

[0009] The prestress loading module is used to provide initial prestress for the anchor solid specimen;

[0010] The data processing module is used to collect and process data, calculate the circumferential stress and radial stress, generate the comprehensive life prediction model of the failure of the anchor solid specimen, and estimate the comprehensive life of the anchor solid at the engineering site.

[0011] Optionally, the anchor solid specimen includes a cable anchor and mortar; the mortar is cylindrical and wraps the cable anchor.

[0012] Optionally, the temperature control module includes: a thermostat, a heater, a radiator, a temperature sensor, and a heat preservation box;

[0013] The thermostat is used to set and adjust the target temperature in the heat preservation box, and control the working states of the heater and the radiator to maintain the required temperature conditions;

[0014] The heater is used to provide heat to ensure that the temperature in the heat preservation box reaches the set value;

[0015] The radiator is used to dissipate heat to ensure that the temperature in the heat preservation box reaches the set value;

[0016] The temperature sensor is used to monitor the actual temperature in the heat preservation box in real time and feedback the actual temperature to the thermostat;

[0017] The heat preservation box is used to enclose the test environment and reduce the influence of external temperature changes.

[0018] Optionally, the corrosion solution circulation module includes a water level controller, a water level gauge, a water pump, a liquid storage tank, a corrosion tank, a concentration regulator, an overflow pipe, a drain pipe, a water injection pipe, a solenoid valve, a corrosion solution, an ion concentration sensor, a solution outlet pipe, and a liquid storage cavity;

[0019] The water injection pipe is connected to the water pump, and the water pump is started to inject the corrosion solution into the corrosion tank. The water level gauge is connected to the water level controller, and the water level controller closes the water pump when the water level reaches the set height;

[0020] The corrosion tank is the container for the corrosion process of the anchor solid specimen. The overflow pipe is arranged at the limit height liquid level of the corrosion tank, and the drain pipe is arranged at the lowest liquid level of the corrosion tank. The drain pipe is connected to the solenoid valve;

[0021] The corrosion solution is composed of erosive ions. The corrosion solution is stored in the liquid storage tank, and the liquid storage tank is arranged outside the heat preservation box;

[0022] The concentration regulator is arranged above the liquid storage tank. The corrosive ion solution is contained in the concentration regulator. When the concentration of the corrosive ion solution is lower than the threshold value, the corrosive ion solution is injected into the liquid storage tank.

[0023] Optionally, the concentration regulator includes: an ion concentration sensor, a solution outlet pipe, and a liquid storage cavity;

[0024] The ion concentration sensor measures the concentrations of various corrosive ions in the corrosive ion solution. The solution outlet pipe extends into the liquid storage tank to inject the corrosive ion solution into the liquid storage tank. The liquid storage cavity stores various corrosive ion solutions separately.

[0025] Optionally, the deformation measurement module includes: a deformation data collector, a thick-walled cylinder, and a deformation sensor;

[0026] The deformation sensor is used to measure the radial expansion deformation of the mortar. The number of deformation sensors is 3, and each is spaced 60°. They are arranged radially along the anchor solid specimen.

[0027] The deformation data collector is used to record the radial expansion deformation of the mortar.

[0028] The thick-walled cylinder is used to fix the deformation sensor. There are 3 fixing holes on the thick-walled cylinder, and the deformation sensor is fixed through these fixing holes.

[0029] Optionally, the prestress loading module includes: a pressure collector, a clamp, a pre-tightening bolt, a planar thrust bearing, a pressure gauge, a cushion block, an internal thread sleeve, and a reaction frame;

[0030] The reaction frame is a U-shaped steel frame. The cushion block is closely attached to the outside of the reaction frame. The pressure gauge is closely attached to the outside of the cushion block. The pressure gauge is connected to the pressure collector, and the pressure collector monitors and records the change in the anchor cable tension. The clamps are respectively arranged at both ends of the anchor cable. One end is the fixed end, and the other end is the prestress application end. The inside of the clamp is conical. The internal thread sleeve is closely attached to the outside of the pressure gauge. The inside of the internal thread sleeve is threaded, and the external shape of the internal thread sleeve is square. The pre-tightening bolt is screwed into the internal thread sleeve, and the planar thrust bearing is located between the pre-tightening bolt and the clamp.

[0031] Optionally, the method for calculating the circumferential stress and the radial stress includes:

[0032] According to the radial expansion deformation of the mortar, through formula (1) and formula (2), the circumferential strain at the outer diameter of the mortar is obtained.

[0033] (1)

[0034] (2)

[0035] In the formula, is the circumferential strain at the outer diameter of the mortar, is the radial expansion deformation of the mortar measured by the first deformation sensor, is the radial expansion deformation of the mortar measured by the second deformation sensor, is the radial expansion deformation of the mortar measured by the third deformation sensor, is the circumferential deformation of the anchor solid specimen, is the outer radius of the mortar;

[0036] According to the circumferential strain at the outer diameter of the mortar, through formula (3), the radial stress at the inner diameter of the mortar is obtained,

[0037] (3)

[0038] In the formula, is the elastic modulus, is the radial stress at the inner diameter of the mortar, is the inner radius of the mortar;

[0039] According to the radial stress at the inner diameter of the mortar, through formula (4), the circumferential stress at the inner diameter of the mortar is obtained,

[0040] (4)

[0041] In the formula, is the circumferential stress at the inner diameter of the mortar.

[0042] Optionally, the method for generating the comprehensive life prediction model of the anchor solid specimen failure and predicting the comprehensive life of the anchor solid at the engineering site includes:

[0043] According to the corrosion experiment under the action of multi-field coupling factors, using the orthogonal design method, data is collected through this data processing module to obtain the first data set under the action of multi-field coupling factors, and the multi-field coupling factors include: temperature factor, stress factor, dry-wet cycling factor and chemical factor;

[0044] According to the first data set under the action of multi-field coupling factors, through data processing extraction, the key features of the first data set are obtained;

[0045] According to this data processing module, through calculation, the corresponding circumferential stress is obtained;

[0046] According to the corresponding circumferential stress, through formula (5) judgment, the corresponding failure state of the anchor solid is obtained,

[0047] (5)

[0048] In the formula, is the tensile strength of the mortar;

[0049] According to the corresponding failure state of the anchor solid, determine the time of the corresponding failure state of the anchor solid, and obtain the life of the anchor solid at the time of failure;

[0050] According to the key features of the first data set and the life of the anchor solid at the time of failure, use the neural network algorithm, and through formula (6), obtain the comprehensive life prediction model of the anchor solid specimen; (6)

[0051] In the formula, is the comprehensive life prediction model of the anchor solid specimen; is the nth moment; is the temperature; is the stress; is the interval time of wet-dry alternation; is the number of wet-dry alternations; is the concentration of erosive ion solution; is the hydrogen ion concentration; is the sulfate ion concentration; is the chloride ion concentration; is the accelerated corrosion weight factor of temperature; is the accelerated corrosion weight factor of stress; is the accelerated corrosion weight factor of the interval time of wet-dry alternation; is the accelerated corrosion weight factor of the number of wet-dry alternations; is the accelerated corrosion weight factor of concentration; is the accelerated corrosion weight factor of hydrogen ion; is the accelerated corrosion weight factor of sulfate ion; is the accelerated corrosion weight factor of chloride ion; is the time function under the influence of temperature; is the time function under the influence of stress; is the time function under the influence of the interval time of wet-dry alternation; is the time function under the influence of the number of wet-dry alternations; is the time function under the influence of concentration; is the time function under the influence of hydrogen ion; is the time function under the influence of sulfate ion and is the time function under the influence of chloride ion;

[0052] Collect the data of the anchor solid at the engineering site through the data processing module, and obtain the data set of the anchor solid at the engineering site under the action of multi-field coupling factors;

[0053] Input the dataset of the anchor solids at the engineering site under the action of the multi-field coupling factors into the comprehensive life prediction model of the failure of the anchor solid specimens to obtain the comprehensive life of the anchor solids at the engineering site.

[0054] On the other hand, the present invention provides a method for testing the corrosion of anchor solids under multi-field coupling, which is implemented by a test system for the corrosion of anchor solids under multi-field coupling. The method includes:

[0055] S1. Design the mortar into a cylindrical shape and wrap the cable anchor to obtain a set of anchor solid specimens;

[0056] S2. Place the set of anchor solid specimens in the prestress loading module, carry out orthogonal experiments under multiple groups of environmental factors through the temperature control module and the corrosion solution circulation module, and measure through the deformation measurement module to obtain the cracking deformation dataset of the set of anchor solid specimens;

[0057] S3. According to the cracking deformation dataset of the set of anchor solid specimens, through the data processing module, obtain the dataset of the anchor solid specimens under the action of multi-field coupling factors;

[0058] S4. According to the dataset of the anchor solid specimens under the action of multi-field coupling factors, adopt the neural network algorithm to obtain the comprehensive life prediction model of the failure of the anchor solid specimens;

[0059] S5. Collect the environmental data at the engineering site and the data of the anchor solids at the engineering site through the data processing module to obtain the dataset of the anchor solids at the engineering site;

[0060] S6. Input the dataset of the anchor solids at the engineering site into the comprehensive life prediction model of the failure of the anchor solid specimens to obtain the predicted service life of the anchor solids at the engineering site;

[0061] S7. According to the predicted service life of the anchor solids at the engineering site, by comparing with the engineering design service life, judge the qualification of the anchor solids at the engineering site. The basis for comparing with the engineering design service life is as follows:

[0062] When the predicted service life ≥ the design service life, the anchor solids at the engineering site are qualified.

[0063] When the predicted service life < the design service life, the anchor solids at the engineering site fail.

[0064] Compared with the prior art, the technical solution of the present invention has at least the following beneficial effects:

[0065] In the first aspect of the above solution, the radial deformation monitoring is converted into circumferential deformation monitoring through the deformation measurement module, solving the problem of corrosion damage of the sensor by the corrosive solution and realizing the automatic monitoring of the deformation of the specimen in the corrosive environment. In the second aspect, through the temperature control module and the corrosive solution circulation module, the automatic control of temperature-accelerated corrosion and the automatic adjustment of the solution concentration are realized, enabling real-time analysis of the corrosion process. In the third aspect, through the data processing module, using the comprehensive life prediction model for the failure of the anchor solid specimen, the service life of the anchor solid is predicted. This system can be applied to the expansion deformation monitoring during the corrosion process of the anchor solid under multi-field coupling and the failure prediction of the anchor solid. Description of the Drawings

[0066] To more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0067] Figure 1 It is a system schematic diagram of an embodiment of the anchor solid corrosion test system under multi-field coupling of the present invention;

[0068] Figure 2 It is a system block diagram of an embodiment of the anchor solid corrosion test system under multi-field coupling of the present invention;

[0069] Figure 3 It is a schematic diagram of the temperature control module of an embodiment of the anchor solid corrosion test system under multi-field coupling of the present invention;

[0070] Figure 4 It is a schematic diagram of the corrosive solution circulation module of an embodiment of the anchor solid corrosion test system under multi-field coupling of the present invention;

[0071] Figure 5 It is a schematic diagram of the deformation measurement module of an embodiment of the anchor solid corrosion test system under multi-field coupling of the present invention;

[0072] Figure 6 It is a schematic diagram of the prestress loading module of an embodiment of the anchor solid corrosion test system under multi-field coupling of the present invention;

[0073] Figure 7 It is a cross-sectional schematic diagram of the anchor solid specimen of an embodiment of the anchor solid corrosion test system under multi-field coupling of the present invention;

[0074] Figure 8 It is a flow chart for calculating the circumferential stress and the radial stress of an embodiment of the anchor solid corrosion test system under multi-field coupling of the present invention;

[0075] Figure 9 It is a flowchart for generating a comprehensive life prediction model of the anchor solid specimen failure and estimating the comprehensive life of the anchor solid at the engineering site in the embodiment of the anchor solid corrosion test system under the multi-field coupling action of the present invention;

[0076] Figure 10 It is a flowchart of the embodiment of the anchor solid corrosion test method under the multi-field coupling action of the present invention.

[0077] Explanation of the reference numerals in the figure: temperature control module 1, corrosion solution circulation module 2, deformation measurement module 3, prestress loading module 4, data processing module 5, anchor solid specimen 6, thermostat 101, heater 102, radiator 103, temperature sensor 104, incubator 105, water level controller 201, water level gauge 202, water pump 203, liquid storage tank 204, corrosion tank 205, concentration regulator 206, overflow pipe 207, drain pipe 208, water injection pipe 209, solenoid valve 210, corrosion solution 211, ion concentration sensor 2061, solution outlet pipe 2062, liquid storage cavity 2063, deformation data collector 301, thick-walled cylinder 302, deformation sensor 303, pressure collector 401, fixture 402, pre-tightening bolt 403, plane thrust bearing 404, pressure gauge 405, spacer 406, internal thread sleeve 407, reaction frame 408, mortar 601, anchor cable 602. Detailed implementation manners

[0078] The technical solutions in the present invention will be described below with reference to the accompanying drawings.

[0079] In the embodiments of the present invention, words such as "exemplarily" and "for example" are used to represent examples, illustrations or explanations. Any embodiment or design solution described as "example" in the present invention should not be construed as being more preferred or having more advantages than other embodiments or design solutions. Exactly speaking, the use of the word "example" is intended to present concepts in a specific manner. In addition, in the embodiments of the present invention, the meaning expressed by "and / or" can be both, or either one of the two.

[0080] To make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following will be described in detail with reference to the accompanying drawings and specific embodiments.

[0081] As Figure 1 shown in the system schematic diagram of the embodiment of the anchor solid corrosion test system under the multi-field coupling action of the present invention and as Figure 2System block diagram of the embodiment of the anchor solid corrosion test system under multi-field coupling of the present invention. The present invention provides an anchor solid corrosion test system under multi-field coupling, which can implement an anchor solid corrosion test method under multi-field coupling. The system includes: a temperature control module 1, a corrosion solution circulation module 2, a deformation measurement module 3, a prestress loading module 4, and a data processing module 5;

[0082] The temperature control module 1 is used to provide a set temperature environment for the anchor solid specimen 6;

[0083] Specifically, as Figure 7 Cross-sectional schematic diagram of the anchor solid specimen of the embodiment of the anchor solid corrosion test system under multi-field coupling of the present invention. The anchor solid specimen 6 includes a cable 602 and mortar 601; the mortar 601 is cylindrical and wraps the cable 602.

[0084] Specifically, as Figure 3 Schematic diagram of the temperature control module of the embodiment of the anchor solid corrosion test system under multi-field coupling of the present invention. The temperature control module 1 includes: a temperature controller 101, a heater 102, a radiator 103, a temperature sensor 104, and a heat preservation box 105;

[0085] The temperature controller 101 is used to set and adjust the target temperature in the heat preservation box 105, and control the working states of the heater 102 and the radiator 103 to maintain the required temperature conditions;

[0086] The heater 102 is used to provide heat to ensure that the temperature in the heat preservation box 105 reaches the set value;

[0087] The radiator 103 is used to dissipate heat to ensure that the temperature in the heat preservation box 105 reaches the set value;

[0088] The temperature sensor 104 is used to monitor the actual temperature in the heat preservation box 105 in real time and feed back the actual temperature to the temperature controller 101;

[0089] The heat preservation box 105 is used to surround the test environment and reduce the influence of external temperature changes.

[0090] The corrosion solution circulation module 2 is used to provide a dry-wet alternating corrosion environment for the anchor solid specimen 6;

[0091] Specifically, as Figure 4Schematic diagram of the corrosion solution circulation module of the embodiment of the anchor solid corrosion test system under multi-field coupling of the present invention as shown. The corrosion solution circulation module 2 includes a water level controller 201, a water level gauge 202, a water pump 203, a liquid storage tank 204, a corrosion tank 205, a concentration regulator 206, an overflow pipe 207, a drain pipe 208, a water injection pipe 209, an electromagnetic valve 210, a corrosion solution 211, an ion concentration sensor 2061, a solution outlet pipe 2062, and a liquid storage cavity 2063;

[0092] The water injection pipe 209 is connected to the water pump 203. Starting the water pump 203 injects the corrosion solution 211 into the corrosion tank 205. The water level gauge 202 is connected to the water level controller 201, and the water level controller 201 closes the water pump 203 when the water level reaches the set height;

[0093] The corrosion tank 205 is a container for the corrosion process of the anchor solid specimen 6. The overflow pipe 207 is arranged at the height-limiting liquid level of the corrosion tank 205, and the drain pipe 208 is arranged at the lowest liquid level of the corrosion tank 205. The drain pipe 208 is connected to the electromagnetic valve 210;

[0094] The corrosion solution 211 is composed of erosive ions. The corrosion solution 211 is stored in the liquid storage tank 204, and the liquid storage tank 204 is arranged outside the heat preservation box 105;

[0095] The concentration regulator 206 is arranged above the liquid storage tank 204. The concentration regulator 206 contains the erosive ion solution. When the concentration of the erosive ion solution is lower than the threshold value, the erosive ion solution is injected into the liquid storage tank 204.

[0096] Specifically, the concentration regulator 206 includes: an ion concentration sensor 2061, a solution outlet pipe 2062, and a liquid storage cavity 2063;

[0097] The ion concentration sensor 2061 measures the concentrations of various erosive ions in the erosive ion solution. The solution outlet pipe 2062 extends into the liquid storage tank 204 to inject the erosive ion solution into the liquid storage tank 204. The liquid storage cavity 2063 stores various erosive ion solutions separately.

[0098] The deformation measurement module 3 is used to measure the cracking deformation of the anchor solid specimen 6 during the corrosion process;

[0099] Specifically, as Figure 5 Schematic diagram of the deformation measurement module of the embodiment of the anchor solid corrosion test system under multi-field coupling of the present invention as shown. The deformation measurement module 3 includes: a deformation data collector 301, a thick-walled cylinder 302, and a deformation sensor 303;

[0100] The deformation sensor 303 is used to measure the radial expansion deformation of the mortar 601. The number of the deformation sensors 303 is three, and each is spaced 60° apart and arranged radially along the anchor solid specimen 6.

[0101] The deformation data collector 301 is used to record the radial expansion deformation of the mortar 601.

[0102] The thick-walled cylinder 302 is used to fix the deformation sensor 303. There are three fixing holes on the thick-walled cylinder 302, and the deformation sensor 303 is fixed through the fixing holes.

[0103] The prestress loading module 4 is used to provide an initial prestress for the anchor solid specimen 6.

[0104] Specifically, as Figure 6 shown in the schematic diagram of the prestress loading module of the embodiment of the anchor solid corrosion test system under multi-field coupling action of the present invention, the prestress loading module 4 includes a pressure collector 401, a fixture 402, a pre-tightening bolt 403, a planar thrust bearing 404, a pressure gauge 405, a spacer 406, an internal thread sleeve 407, and a reaction frame 408.

[0105] The reaction frame 408 is a U-shaped steel frame, and the spacer 406 is closely attached to the outside of the reaction frame 408; the pressure gauge 405 is closely attached to the outside of the spacer 406, the pressure gauge 405 is connected to the pressure collector 401, the pressure collector 401 monitors and records the change in the tension of the anchor cable 602, the fixtures 402 are respectively arranged at both ends of the anchor cable 602, one end is a fixed end, and the other end is a prestress application end. The inside of the fixture 402 is conical. The internal thread sleeve 407 is closely attached to the outside of the pressure gauge 405. The inside of the internal thread sleeve 407 is threaded, and the external shape of the internal thread sleeve 407 is square. The pre-tightening bolt 403 is screwed into the internal thread sleeve 407, and a thrust is formed on the anchor cable 602 by rotating the pre-tightening bolt 403. The planar thrust bearing 404 is located between the pre-tightening bolt 403 and the fixture 402.

[0106] The data processing module 5 is used to collect and process data, calculate the circumferential stress and the radial stress, generate a comprehensive life prediction model for the failure of the anchor solid specimen, and estimate the comprehensive life of the anchor solid at the engineering site.

[0107] Specifically, as Figure 8 shown in the flow chart of calculating the circumferential stress and the radial stress of the embodiment of the anchor solid corrosion test system under multi-field coupling action of the present invention, the method for calculating the circumferential stress and the radial stress includes:

[0108] According to the radial expansion deformation of the mortar 601, the circumferential strain at the outer diameter of the mortar 601 is obtained through formula (1) and formula (2).

[0109] (1)

[0110] (2)

[0111] In the formula, is the circumferential strain at the outer diameter of the mortar 601, is the radial expansion deformation of the mortar 601 measured by the first deformation sensor 303, is the radial expansion deformation of the mortar 601 measured by the second deformation sensor 303, is the radial expansion deformation of the mortar 601 measured by the third deformation sensor 303, is the circumferential deformation of the anchor solid specimen 6, is the outer radius of the mortar 601;

[0112] According to the circumferential strain at the outer diameter of the mortar 601, through formula (3), the radial stress at the inner diameter of the mortar 601 is obtained.

[0113] (3)

[0114] In the formula, is the elastic modulus, is the radial stress at the inner diameter of the mortar, is the inner radius of the mortar 601;

[0115] According to the radial stress at the inner diameter of the mortar 601, through formula (4), the circumferential stress at the inner diameter of the mortar 601 is obtained.

[0116] (4)

[0117] In the formula, Circumferential stress at the inner diameter of the mortar 601.

[0118] Specifically, as Figure 9 shown in the flowchart of generating the comprehensive life prediction model of the anchor solid specimen failure and predicting the comprehensive life of the anchor solid in the engineering field in the embodiment of the anchor solid corrosion test system under multi-field coupling action of the present invention, the method of generating the comprehensive life prediction model of the anchor solid specimen failure and predicting the comprehensive life of the anchor solid in the engineering field includes:

[0119] According to the corrosion experiment under the action of multi-field coupling factors, using the orthogonal design method, data is collected through the data processing module 5 to obtain the first data set under the action of multi-field coupling factors, and the multi-field coupling factors include: temperature factor, stress factor, dry-wet alternation factor, and chemical factor;

[0120] According to the first data set under the action of the multi-field coupling factors, key features of the first data set are obtained through data processing and extraction.

[0121] According to the data processing module 5, through calculation, the corresponding circumferential stress is obtained;

[0122] According to the corresponding circumferential stress, through judgment by formula (5), the corresponding failure state of the anchor solid is obtained.

[0123] (5)

[0124] In the formula, is the tensile strength of the mortar;

[0125] According to the corresponding failure state of the anchor solid, the time of the corresponding failure state of the anchor solid is determined, and the corresponding life at the failure of the anchor solid is obtained.

[0126] According to the key features of the first data set and the corresponding life at the failure of the anchor solid, using the neural network algorithm, through formula (6), the comprehensive life prediction model of the anchor solid specimen failure is obtained. (6)

[0127] In the formula, is the comprehensive life prediction model of the anchor solid specimen failure, is the nth moment, is the temperature, is the stress, is the interval time of dry-wet alternation, is the number of dry-wet alternations, is the concentration of the erosive ion solution, is the hydrogen ion concentration, is the sulfate ion concentration, is the chloride ion concentration, is the acceleration corrosion weight factor of the temperature, is the acceleration corrosion weight factor of the stress, is the acceleration corrosion weight factor of the interval time of dry-wet alternation, is the acceleration corrosion weight factor of the number of dry-wet alternations, is the acceleration corrosion weight factor of the concentration, is the acceleration corrosion weight factor of the hydrogen ion, is the acceleration corrosion weight factor of the sulfate ion, is the acceleration corrosion weight factor of the chloride ion, is the time function under the influence of temperature, is the time function under the influence of stress, is the time function under the influence of the interval time of dry-wet alternation, is the time function under the influence of the number of dry-wet alternations, is the time function under the influence of the concentration, Is a function of time under the influence of hydrogen ions, Is a function of time under the influence of sulfate ions and Is a function of time under the influence of chloride ions;

[0128] The data processing module collects the data of the anchor solids at the engineering site, and obtains a data set of the anchor solids at the engineering site under the action of multi-field coupling factors;

[0129] Input the data set of the anchor solids at the engineering site under the action of multi-field coupling factors into the comprehensive life prediction model of the failure of the anchor solid specimen, and obtain the comprehensive life of the anchor solids at the engineering site.

[0130] As Figure 10 The flowchart of the embodiment of the corrosion test method of the anchor solid under multi-field coupling of the present invention shown, the present invention provides a corrosion test method of the anchor solid under multi-field coupling, which is realized by a corrosion test system of the anchor solid under multi-field coupling, and the method includes:

[0131] S1. Design the mortar into a cylindrical shape and wrap the anchor cable to obtain a set of anchor solid specimens;

[0132] S2. Place the set of anchor solid specimens in the prestressed loading module, carry out orthogonal experiments under multiple environmental factors through the temperature control module and the corrosion solution circulation module, and measure through the deformation measurement module to obtain the cracking deformation data set of the anchor solid specimen set;

[0133] S3. According to the cracking deformation data set of the anchor solid specimen set, through the data processing module, obtain the data set of the anchor solid specimen under the action of multi-field coupling factors;

[0134] S4. According to the data set of the anchor solid specimen under the action of multi-field coupling factors, adopt the neural network algorithm to obtain the comprehensive life prediction model of the failure of the anchor solid specimen;

[0135] S5. The data processing module collects the environmental data of the engineering site and the data of the anchor solids at the engineering site, and obtains the data set of the anchor solids at the engineering site;

[0136] S6. Input the data set of the anchor solids at the engineering site into the comprehensive life prediction model of the failure of the anchor solid specimen, and obtain the predicted service life of the anchor solids at the engineering site;

[0137] S7. According to the predicted service life of the anchor solids at the engineering site, by comparing with the engineering design service life, judge the qualification of the anchor solids at the engineering site, and the basis for comparing with the engineering design service life is as follows:

[0138] When the predicted service life ≥ the design service life, the anchor solids at the engineering site are qualified,

[0139] When the predicted service life < the designed service life, the on-site anchor body of the project fails.

[0140] The present invention provides an anchor body corrosion test system and method under multi-field coupling action. The invention includes a temperature control module 1, a corrosion solution circulation module 2, a deformation measurement module 3, a prestress loading module 4, and a data processing module 5. The invention converts the radial deformation monitoring into circumferential deformation monitoring through the deformation measurement module 3, solves the problem of corrosion damage of the sensor by the corrosion solution, and realizes the automatic monitoring of the deformation of the specimen in the corrosion environment. Secondly, through the temperature control module 1 and the corrosion solution circulation module 2, the automatic control of temperature accelerated corrosion and the automatic adjustment of the solution concentration are realized, and the corrosion process can be analyzed in real time. Finally, through the data processing module 5, using the comprehensive life prediction model of the anchor body specimen failure, the service life of the anchor body is predicted. This system can be applied to the expansion deformation monitoring during the corrosion process of the anchor body under multi-field coupling action and the failure prediction of the anchor body.

[0141] It can be understood that the present invention is described through the above embodiments and should not be construed as a limitation on the embodiments and scope of the present invention. Those skilled in the art know that various changes or equivalent replacements can be made to these features and embodiments without departing from the spirit and scope of the present invention. Additionally, under the teaching of the present invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application belong to the scope protected by the present invention.

Claims

1. An anchor solid corrosion test system under the action of multi-field coupling, characterized in that, The system includes: A temperature control module for providing a set temperature environment for the anchor solid specimen; A corrosion solution circulation module for providing a dry-wet alternating corrosion environment for the anchor solid specimen; A deformation measurement module for measuring the cracking deformation of the anchor solid specimen during corrosion; A prestress loading module for providing an initial prestress for the anchor solid specimen; A data processing module for collecting and processing data, calculating circumferential stress and radial stress, generating a failure comprehensive life prediction model for the anchor solid specimen, and predicting the comprehensive life of the anchor solid at the engineering site.

2. The corrosion test system for an anchored solid under multi-field coupling according to claim 1, wherein, The anchor solid specimen includes a cable anchor and mortar; the mortar is cylindrical and wraps the cable anchor.

3. The corrosion test system for an anchored solid under the action of multi-field coupling according to claim 1, characterized in that, The temperature control module includes: a thermostat, a heater, a radiator, a temperature sensor, and a heat preservation box; The thermostat is used to set and adjust the target temperature in the heat preservation box, and control the working states of the heater and the radiator to maintain the required temperature conditions; The heater is used to provide heat to ensure that the temperature in the heat preservation box reaches the set value; The radiator is used to dissipate heat to ensure that the temperature in the heat preservation box reaches the set value; The temperature sensor is used to monitor the actual temperature in the heat preservation box in real time and feedback the actual temperature to the thermostat; The heat preservation box is used to enclose the test environment and reduce the influence of external temperature changes.

4. The corrosion test system of the anchor solid under the action of multi-field coupling according to claim 3, characterized in that, The corrosion solution circulation module includes a water level controller, a water level gauge, a water pump, a liquid storage tank, a corrosion tank, a concentration regulator, an overflow pipe, a drain pipe, a water injection pipe, a solenoid valve, a corrosion solution, an ion concentration sensor, a solution outlet pipe, and a liquid storage cavity; The water injection pipe is connected to the water pump. Starting the water pump injects the corrosion solution into the corrosion tank. The water level gauge is connected to the water level controller, and the water level controller closes the water pump when the water level reaches the set height; The corrosion tank is the container for the corrosion process of the anchor solid specimen. The overflow pipe is arranged at the limiting liquid level of the corrosion tank, and the drain pipe is arranged at the lowest liquid level of the corrosion tank. The drain pipe is connected to the solenoid valve; The corrosion solution is composed of erosive ions. The corrosion solution is stored in the liquid storage tank, and the liquid storage tank is arranged outside the heat preservation box; The concentration regulator is arranged above the liquid storage tank. The concentration regulator contains the erosive ion solution. When the concentration of the erosive ion solution is lower than the threshold value, the erosive ion solution is injected into the liquid storage tank.

5. The anchor solid corrosion test system under multi-field coupling action according to claim 4, characterized in that, The concentration regulator includes: an ion concentration sensor, a solution outlet pipe, and a liquid storage cavity; The ion concentration sensor measures the concentrations of various erosive ions in the erosive ion solution. The solution outlet pipe extends into the liquid storage tank to inject the erosive ion solution into the liquid storage tank; the liquid storage cavity stores various erosive ion solutions separately.

6. The corrosion test system of the anchored solid under multi-field coupling according to claim 2, characterized in that, The deformation measurement module includes: a deformation data collector, a thick-walled cylinder, and a deformation sensor; The deformation sensor is used to measure the radial expansion deformation of the mortar. The number of deformation sensors is 3, and each is spaced 60°, arranged radially along the anchor solid specimen; The deformation data collector is used to record the radial expansion deformation of the mortar; The thick-walled cylinder is used to fix the deformation sensor. There are 3 fixing holes on the thick-walled cylinder, and the deformation sensor is fixed through the fixing holes.

7. The corrosion test system of the anchored solid under multi-field coupling according to claim 2, characterized in that, The prestressed loading module includes a pressure collector, a fixture, a pre-tightening bolt, a planar thrust bearing, a pressure gauge, a spacer, an internal thread sleeve, and a reaction frame; The reaction frame is a U-shaped steel frame, and the spacer is closely attached to the outside of the reaction frame; the pressure gauge is closely attached to the outside of the spacer, the pressure gauge is connected to the pressure collector, and the pressure collector monitors and records the change in the anchor cable tension. The fixtures are respectively arranged at both ends of the anchor cable, one end is the fixed end, and the other end is the prestress application end. The inside of the fixture is conical. The internal thread sleeve is closely attached to the outside of the pressure gauge. The inside of the internal thread sleeve is threaded, and the external shape of the internal thread sleeve is square. The pre-tightening bolt is screwed into the internal thread sleeve, and the planar thrust bearing is located between the pre-tightening bolt and the fixture.

8. The anchor solid corrosion test system under multi-field coupling action according to claim 6, characterized in that The method for calculating the circumferential stress and radial stress includes: According to the radial expansion deformation of the mortar, through formula (1) and formula (2), the circumferential strain at the outer diameter of the mortar is obtained. （1） （2） Wherein, is the circumferential strain at the outer diameter of the mortar, is the radial expansion deformation of the mortar measured by the first deformation sensor, is the radial expansion deformation of the mortar measured by the second deformation sensor, is the radial expansion deformation of the mortar measured by the third deformation sensor, is the circumferential deformation of the anchor solid specimen, is the outer radius of the mortar; According to the circumferential strain at the outer diameter of the mortar, through formula (3), the radial stress at the inner diameter of the mortar is obtained. （3） In the formula, is the elastic modulus, is the radial stress of the inner diameter of the mortar, is the inner radius of the mortar; According to the radial stress at the inner diameter of the mortar, through formula (4), the circumferential stress at the inner diameter of the mortar is obtained. （4） In the formula, The circumferential stress of the inner diameter of the mortar.

9. The corrosion test system for an anchored solid under the action of multi-field coupling according to claim 8, characterized in that, The method for generating the comprehensive life prediction model of the anchor solid specimen failure and predicting the comprehensive life of the anchor solid at the engineering site includes: According to the corrosion experiment under the action of multi-field coupling factors, using the orthogonal design method, data is collected through the data processing module to obtain the first data set under the action of multi-field coupling factors. The multi-field coupling factors include: temperature factor, stress factor, dry-wet alternation factor, and chemical factor; According to the first data set under the action of multi-field coupling factors, through data processing and extraction, the key features of the first data set are obtained. According to the data processing module, through calculation, the corresponding circumferential stress is obtained. According to the corresponding circumferential stress, through formula (5) judgment, the corresponding anchor solid failure state is obtained. （5） In the formula, is the tensile strength of the mortar; According to the corresponding anchor solid failure state, determine the time of the corresponding anchor solid failure state to obtain the life of the corresponding anchor solid at failure. According to the key features of the first data set and the life of the corresponding anchor solid at failure, using the neural network algorithm, through formula (6), the comprehensive life prediction model of the anchor solid specimen failure is obtained. （6） In the formula, is the comprehensive life prediction model of the anchor solid sample failure, is at the nth moment, is the temperature, is the stress, is the interval time of dry-wet alternation, is the number of dry-wet alternations, is the concentration of erosive ion solution, is the hydrogen ion concentration, is the sulfate ion concentration, is the chloride ion concentration, is the accelerated corrosion weight factor of temperature, is the accelerated corrosion weight factor of stress, is the accelerated corrosion weight factor of the interval time of dry-wet alternation, is the accelerated corrosion weight factor of the number of dry-wet alternations, is the accelerated corrosion weight factor of concentration, is the accelerated corrosion weight factor of hydrogen ion, is the accelerated corrosion weight factor of sulfate ion, is the accelerated corrosion weight factor of chloride ion, is the time function under the influence of temperature, is the time function under the influence of stress, is the time function under the influence of the interval time of dry-wet alternation, is the time function under the influence of the number of dry-wet alternations, is the time function under the influence of concentration, is the time function under the influence of hydrogen ion, is the time function under the influence of sulfate ion and is the time function under the influence of chloride ion; Through the data processing module, collect the data of the anchor solid at the engineering site to obtain the data set of the anchor solid at the engineering site under the action of multi-field coupling factors. Input the data set of the anchor solid at the engineering site under the action of multi-field coupling factors into the comprehensive life prediction model of the anchor solid specimen failure to obtain the comprehensive life of the anchor solid at the engineering site.

10. A corrosion test method for an anchored solid under multi-field coupling action, the corrosion test method for the anchored solid under multi-field coupling action is realized by the corrosion test system for the anchored solid under multi-field coupling action according to any one of claims 1-9, characterized in that, The method includes: S1. Design the mortar into a cylindrical shape and wrap the anchor cable to obtain a set of anchor solid specimens; S2. Place the set of anchor solid specimens in the prestressed loading module, conduct orthogonal experiments under multiple environmental factors through the temperature control module and the corrosion solution circulation module, and measure through the deformation measurement module to obtain the cracking deformation data set of the set of anchor solid specimens; S3. According to the cracking deformation data set of the set of anchor solid specimens, obtain the data set of anchor solid specimens under the action of multi-field coupling factors through the data processing module; S4. According to the data set of anchor solid specimens under the action of multi-field coupling factors, use the neural network algorithm to obtain the comprehensive life prediction model of the failure of anchor solid specimens; S5. Collect the environmental data of the engineering site and the anchor solid data of the engineering site through the data processing module to obtain the data set of the anchor solid at the engineering site; S6. Input the data set of the anchor solid at the engineering site into the comprehensive life prediction model of the failure of anchor solid specimens to obtain the predicted service life of the anchor solid at the engineering site; S7. According to the predicted service life of the anchor solid at the engineering site, judge the qualification of the anchor solid at the engineering site by comparing with the engineering design service life. The basis for comparing with the engineering design service life is as follows: When the predicted service life ≥ the design service life, the anchor solid at the engineering site is qualified; When the predicted service life < the design service life, the anchor solid at the engineering site fails.

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