A test system and method for corrosion testing of anchor solids under multi-field coupling.

Abstract

This invention provides a corrosion testing system and method for anchor solids under multi-field coupling, belonging to the field of anchor solid corrosion testing technology. The invention includes a temperature control module, a corrosion solution circulation module, a deformation measurement module, a prestressing loading module, and a data processing module. The deformation measurement module converts radial deformation monitoring into circumferential deformation monitoring, solving the problem of corrosion damage to sensors by the corrosion solution and realizing automated monitoring of sample deformation in corrosive environments. Secondly, the temperature control module and corrosion solution circulation module achieve automatic control of temperature-accelerated corrosion and automatic adjustment of solution concentration, enabling real-time analysis of the corrosion process. Finally, the data processing module uses a comprehensive life prediction model for anchor solid sample failure to predict the service life of the anchor solid. This system can be applied to monitoring expansion deformation and predicting anchor solid failure during corrosion under multi-field coupling.

Description

Technical Field

[0001] This invention relates to the field of anchor corrosion testing technology, and in particular to an anchor corrosion testing system and method under multi-field coupling. Background Technology

[0002] Prestressed anchorage structures are widely used in water conservancy, hydropower, transportation, mining and other fields in my country. In anchorage engineering cases, due to the complex and variable application environment, there are more and more cases of anchorage structure failure, which cannot be ignored. In particular, the alternating wet and dry environment caused by seasonal water level fluctuations and the temperature difference between winter and summer create a multi-field coupled environment (temperature-water-stress-chemical) that accelerates the corrosion process of anchorage structures. At the same time, the rust expansion of anchor cables causes cracking of mortar inclusions, forming a vicious cycle for the corrosion process.

[0003] Existing anchor corrosion testing technologies suffer from the following main problems: First, the direct immersion of sensors in corrosive solutions easily leads to sensor corrosion, affecting measurement accuracy and stability. Second, existing technologies typically lack effective multi-field coupled environmental control systems, failing to precisely regulate temperature, wet-dry cycles, and corrosive ion concentrations, resulting in poor correlation between corrosion test results and multiple factors. Furthermore, existing technologies fail to automate the monitoring of multi-factor accelerated corrosion processes, leading to untimely and incomplete data acquisition, hindering real-time analysis of the corrosion process. Finally, due to the lack of systematic data analysis methods, existing technologies struggle to accurately predict the service life of anchors, limiting their application in safety assessments and the selection of protective measures in anchoring projects. Summary of the Invention

[0004] To address the problems in the prior art, this invention provides a corrosion testing system and method for anchor solids under multi-field coupling. This invention converts radial deformation monitoring into circumferential deformation monitoring through a deformation measurement module, solving the problem of corrosion damage to sensors by the corrosive solution and achieving automated monitoring of sample deformation in corrosive environments. Secondly, through a temperature control module and a corrosion solution circulation module, it achieves automatic control of temperature-accelerated corrosion and automatic adjustment of solution concentration, enabling real-time analysis of the corrosion process. Finally, through a data processing module, it uses a comprehensive life prediction model for anchor solid sample failure to predict the service life of the anchor solid. To achieve the above objectives, the technical solution is as follows:

[0005] On the one hand, the present invention provides a test system for anchor body corrosion under multi-field coupling, the system comprising:

[0006] The temperature control module is used to provide a set temperature environment for the anchor solid sample;

[0007] The corrosion solution circulation module is used to provide an alternating wet and dry corrosion environment for the anchor solid sample;

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

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

[0010] The data processing module is used to collect and process data and calculate circumferential and radial stresses, generate a comprehensive life prediction model for the failure of the anchor body sample, and estimate the comprehensive life of the anchor body in the engineering field.

[0011] Optionally, the anchor body sample includes an anchor cable and mortar; the mortar is cylindrical and wraps around the anchor cable.

[0012] Optionally, the temperature control module includes: a temperature controller, a heater, a radiator, a temperature sensor, and an insulation box;

[0013] The temperature controller is used to set and adjust the target temperature inside the insulation box, and to control the working status 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 inside the insulation box reaches the set value;

[0015] The radiator is used to dissipate heat and ensure that the temperature inside the insulation box reaches the set value;

[0016] The temperature sensor is used to monitor the actual temperature inside the insulation box in real time and feed the actual temperature back to the temperature controller.

[0017] This insulated chamber is used to surround the test environment and reduce the impact of external temperature changes.

[0018] Optionally, the corrosion solution circulation module includes a water level controller, a water level gauge, a water pump, a 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 storage cavity.

[0019] The water injection pipe is connected to the water pump. The water pump is started to inject the corrosive solution into the corrosion tank. The water level gauge is connected to the water level controller. The water level controller shuts off the water pump when the water level reaches the set height.

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

[0021] The corrosive solution is composed of corrosive ions and is stored in a storage tank located outside the insulated box.

[0022] The concentration regulator is located above the storage tank and contains the corrosive ionic solution. When the concentration of the corrosive ionic solution is lower than a threshold, the corrosive ionic solution is injected into the storage tank.

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

[0024] The ion concentration sensor measures the concentration of various corrosive ions in the corrosive ion solution. The solution outlet pipe extends into the storage tank, into which the corrosive ion solution is injected. The storage cavity is used to classify and hold various corrosive ion solutions.

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

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

[0027] This deformation data acquisition instrument is used to record the radial expansion deformation of the mortar;

[0028] The thick-walled cylinder is used to fix the deformation sensor. The thick-walled cylinder has three fixing holes through which the deformation sensor is fixed.

[0029] Optionally, the prestressed loading module includes a pressure acquisition instrument, a clamp, a preload bolt, a planar thrust bearing, a pressure gauge, a pad, an internal threaded sleeve, and a reaction frame;

[0030] The reaction frame is a U-shaped steel frame, and the pad is tightly attached to the outside of the reaction frame. The pressure gauge is tightly attached to the outside of the pad and is connected to the pressure acquisition instrument, which monitors and records the change in the anchor cable tension. The clamps are respectively arranged at both ends of the anchor cable, one end being the fixed end and the other end being the prestressing end. The inside of the clamp is conical. The internal threaded sleeve is tightly attached to the outside of the pressure gauge. The inside of the internal threaded sleeve is threaded, and the outside of the internal threaded sleeve is square. The preload bolt is screwed into the internal threaded sleeve, and the planar thrust bearing is located between the preload bolt and the clamp.

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

[0032] Based on the radial expansion deformation of the mortar, the circumferential strain at the outer diameter of the mortar is obtained using formulas (1) and (2).

[0033] (1)

[0034] (2)

[0035] In the formula, The circumferential strain at the outer diameter of the mortar. The radial expansion deformation of the mortar measured by the first deformation sensor. The radial expansion deformation of the mortar measured by the second deformation sensor. The radial expansion deformation of the mortar measured by the third deformation sensor. This represents the circumferential deformation of the anchor body specimen. The outer radius of the mortar;

[0036] Based on the circumferential strain at the outer diameter of the mortar, the radial stress at the inner diameter of the mortar is obtained using formula (3).

[0037] (3)

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

[0039] Based on the radial stress of the mortar's inner diameter, the circumferential stress of the mortar's inner diameter can be obtained using formula (4).

[0040] (4)

[0041] In the formula, Circumferential stress in the inner diameter of the mortar.

[0042] Optionally, the method for generating the comprehensive life prediction model for the failure of the anchor body sample and estimating the comprehensive life of the anchor body in the engineering field includes:

[0043] Based on corrosion experiments under the influence of multiple coupled factors, an orthogonal design method was adopted, and data was collected through this data processing module to obtain the first dataset under the influence of multiple coupled factors, which include: temperature factor, stress factor, wet-dry alternation factor and chemical factor.

[0044] Based on the first dataset under the influence of these multiple coupling factors, the key features of the first dataset are obtained through data processing and extraction.

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

[0046] Based on the corresponding circumferential stress, the corresponding anchor failure state is obtained by using formula (5).

[0047] (5)

[0048] In the formula, This refers to the tensile strength of the mortar.

[0049] Based on the corresponding anchor failure state, the time of the corresponding anchor failure state is determined, and the lifespan of the corresponding anchor failure state is obtained.

[0050] Based on the key features of the first dataset and the corresponding anchor failure lifetime, a neural network algorithm is used to obtain the comprehensive lifetime prediction model for anchor failure samples through formula (6).

[0051] (6)

[0052] In the formula, For the comprehensive life prediction model of anchor solid specimen failure, For the nth time, For temperature, For stress, The interval between dry and wet transitions, The number of times the wet and dry conditions alternate. For the concentration of corrosive ionic solutions, For hydrogen ion concentration, For sulfate ion concentration, Chloride ion concentration, The weighting factor for accelerated corrosion due to temperature, The accelerated corrosion weighting factor of stress The accelerated corrosion weighting factor for the interval between wet and dry cycles. The acceleration corrosion weighting factor based on the number of wet-dry alternations. The concentration-based acceleration corrosion weighting factor Hydrogen ion accelerated corrosion weighting factor The accelerated corrosion weighting factor of sulfate ions. The chloride ion is the weighting factor for accelerating corrosion. Time function under the influence of temperature Time function under stress The time function under the influence of the interval between wet and dry periods. The time function affected by the number of wet and dry alternations. The time function under the influence of concentration The time function under the influence of hydrogen ions The time function under the influence of sulfate ions and This is a time function under the influence of chloride ions;

[0053] This data processing module collects data on anchor bodies at the engineering site, resulting in a dataset of anchor bodies at the engineering site under the influence of multiple coupling factors.

[0054] The dataset of the anchor body in the engineering field under the action of multiple field coupling factors is input into the comprehensive life prediction model of the anchor body sample failure to obtain the comprehensive life of the anchor body in the engineering field.

[0055] On the other hand, the present invention provides a method for testing anchor corrosion under multi-field coupling, which is implemented by a system for testing anchor corrosion under multi-field coupling, and includes:

[0056] S1. Design the mortar into a cylindrical shape and wrap it around the anchor cable to obtain an anchor body sample set;

[0057] S2. Place the anchor solid sample set in the prestress loading module, conduct orthogonal experiments under multiple environmental factors through the temperature control module and the corrosion solution circulation module, and measure the crack deformation data set of the anchor solid sample set through the deformation measurement module.

[0058] S3. Based on the crack deformation dataset of the anchor solid sample set, the data processing module is used to obtain the anchor solid sample dataset under the action of multiple field coupling factors.

[0059] S4. Based on the anchor solid sample dataset under the action of multiple field coupling factors, a neural network algorithm is used to obtain the comprehensive life prediction model for anchor solid sample failure.

[0060] S5. Collect environmental data and anchor body data of the engineering site through the data processing module to obtain the dataset of anchor bodies at the engineering site;

[0061] S6. Input the dataset of the anchor body at the engineering site into the comprehensive life prediction model for the failure of the anchor body sample to obtain the predicted life of the anchor body at the engineering site.

[0062] S7. Based on the predicted service life of the anchorages at the project site, and by comparing them with the designed service life of the project, the qualification of the anchorages at the project site is determined. The basis for comparing the designed service life of the project is as follows:

[0063] When the predicted service life is greater than or equal to the design service life, the anchorage body on site for this project is considered qualified.

[0064] When the predicted service life is less than the design service life, the anchor body in the project site is considered to have failed.

[0065] Compared with the prior art, the technical solution of the present invention has at least the following beneficial effects:

[0066] The above-mentioned solution has several key features. First, by converting radial deformation monitoring into circumferential deformation monitoring through a deformation measurement module, it solves the problem of corrosion damage to the sensor caused by the corrosive solution and realizes automated monitoring of sample deformation in corrosive environments. Second, through a temperature control module and a corrosion solution circulation module, it achieves automatic control of temperature-accelerated corrosion and automatic adjustment of solution concentration, enabling real-time analysis of the corrosion process. Third, through a data processing module, it uses a comprehensive life prediction model for anchor body sample failure to predict the service life of the anchor body. This system can be applied to monitoring expansion deformation during the corrosion process of anchor bodies under multi-field coupling and predicting anchor body failure. Attached Figure Description

[0067] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0068] Figure 1 This is a schematic diagram of an embodiment of the anchor solid corrosion test system under multi-field coupling of the present invention;

[0069] Figure 2 This is a system block diagram of an embodiment of the anchor solid corrosion test system under multi-field coupling of the present invention;

[0070] Figure 3 This 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;

[0071] Figure 4 This is a schematic diagram of the corrosion solution circulation module of an embodiment of the anchor solid corrosion test system under multi-field coupling of the present invention;

[0072] Figure 5 This 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;

[0073] Figure 6 This is a schematic diagram of the prestressed loading module of an embodiment of the anchor solid corrosion test system under multi-field coupling of the present invention;

[0074] Figure 7 This is a schematic cross-sectional view of the anchor body sample in an embodiment of the anchor body corrosion test system under multi-field coupling of the present invention;

[0075] Figure 8 This is a flowchart illustrating the calculation of circumferential and radial stresses in an embodiment of the anchor body corrosion test system under multi-field coupling of the present invention;

[0076] Figure 9 This is a flowchart illustrating how the multi-field coupling effect of the anchor body corrosion test system of the present invention generates a comprehensive life prediction model for the failure of the anchor body sample and estimates the comprehensive life of the anchor body in the engineering field.

[0077] Figure 10 This is a flowchart of an embodiment of the anchor solid corrosion test method under multi-field coupling of the present invention.

[0078] Explanation of the numbers in the diagram: Temperature control module 1, Corrosion solution circulation module 2, Deformation measurement module 3, Prestressing loading module 4, Data processing module 5, Anchor solid sample 6, Temperature controller 101, Heater 102, Radiator 103, Temperature sensor 104, Insulation box 105, Water level controller 201, Water level gauge 202, Water pump 203, Storage tank 204, Corrosion tank 205, Concentration regulator 206, Overflow pipe 207, Drain pipe 208, Injector Water pipe 209, solenoid valve 210, corrosive solution 211, ion concentration sensor 2061, solution outlet pipe 2062, liquid storage cavity 2063, deformation data acquisition instrument 301, thick-walled cylinder 302, deformation sensor 303, pressure acquisition instrument 401, clamp 402, preload bolt 403, planar thrust bearing 404, pressure gauge 405, pad 406, internal threaded sleeve 407, reaction frame 408, mortar 601, anchor cable 602. Detailed Implementation

[0079] The technical solution of the present invention will now be described with reference to the accompanying drawings.

[0080] In embodiments of the present invention, words such as "exemplarily," "for example," etc., are used to indicate that something is an example, illustration, or description. Any embodiment or design described as "exemplary" in the present invention should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of the word "exemplary" is intended to present the concept in a concrete manner. Furthermore, in embodiments of the present invention, the meaning expressed by "and / or" can be both, or either one.

[0081] To make the technical problems, technical solutions and advantages of the present invention clearer, a detailed description will be given below in conjunction with the accompanying drawings and specific embodiments.

[0082] like Figure 1 The system schematic diagram of the anchor body corrosion test system under multi-field coupling of the present invention shown is as follows: Figure 2The diagram shown is a system block diagram of an embodiment of the anchor body corrosion test system under multi-field coupling of the present invention. The present invention provides an anchor body corrosion test system under multi-field coupling, which can realize an anchor body 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.

[0083] Temperature control module 1 is used to provide a set temperature environment for anchor solid sample 6;

[0084] Specifically, such as Figure 7 The diagram shows a cross-sectional view of the anchor body specimen in an embodiment of the multi-field coupling corrosion test system of the present invention. The anchor body specimen 6 includes an anchor cable 602 and mortar 601; the mortar 601 is cylindrical and wraps around the anchor cable 602.

[0085] Specifically, such as Figure 3 The schematic diagram shown is of the temperature control module of the anchor solid corrosion test system embodiment of the present invention under multi-field coupling. The temperature control module 1 includes: a temperature controller 101, a heater 102, a radiator 103, a temperature sensor 104, and an insulation box 105.

[0086] The temperature controller 101 is used to set and adjust the target temperature inside the insulation box 105, and to control the working status of the heater 102 and the radiator 103 to maintain the required temperature conditions.

[0087] The heater 102 is used to provide heat to ensure that the temperature inside the insulation box 105 reaches the set value;

[0088] The radiator 103 is used to dissipate heat and ensure that the temperature inside the insulation box 105 reaches the set value.

[0089] The temperature sensor 104 is used to monitor the actual temperature inside the insulation box 105 in real time and to feed the actual temperature back to the temperature controller 101.

[0090] The insulated box 105 is used to surround the test environment and reduce the impact of external temperature changes.

[0091] The corrosion solution circulation module 2 is used to provide an alternating wet and dry corrosion environment for the anchor solid sample 6;

[0092] Specifically, such as Figure 4The diagram shows a schematic of the corrosion solution circulation module of the anchor solid corrosion test system under multi-field coupling of the present invention. The corrosion solution circulation module 2 includes a water level controller 201, a water level gauge 202, a water pump 203, a storage tank 204, a corrosion tank 205, a concentration regulator 206, an overflow pipe 207, a drain pipe 208, a water injection pipe 209, a solenoid valve 210, a corrosion solution 211, an ion concentration sensor 2061, a solution outlet pipe 2062, and a storage cavity 2063.

[0093] The water injection pipe 209 is connected to the water pump 203. The water pump 203 is started to inject the corrosion solution 211 into the corrosion tank 205. The water level gauge 202 is connected to the water level controller 201. The water level controller 201 shuts off the water pump 203 when the water level reaches the set height.

[0094] The corrosion tank 205 is the container for the corrosion process of the anchor solid sample 6. The overflow pipe 207 is located at the height limit of the liquid level in the corrosion tank 205, and the drain pipe 208 is located at the lowest liquid level in the corrosion tank 205. The drain pipe 208 is connected to the solenoid valve 210.

[0095] The corrosive solution 211 is composed of corrosive ions and is stored in the storage tank 204, which is located outside the insulation box 105.

[0096] The concentration regulator 206 is located above the storage tank 204. The concentration regulator 206 contains the corrosive ionic solution. When the concentration of the corrosive ionic solution is lower than the threshold, the corrosive ionic solution is injected into the storage tank 204.

[0097] Specifically, the concentration regulator 206 includes: an ion concentration sensor 2061, a solution outlet pipe 2062, and a liquid storage cavity 2063;

[0098] The ion concentration sensor 2061 measures the concentration of various corrosive ions in the corrosive ion solution. The solution outlet pipe 2062 extends into the storage tank 204 to inject the corrosive ion solution into the storage tank 204. The storage cavity 2063 holds various corrosive ion solutions in different categories.

[0099] Deformation measurement module 3 is used to measure the cracking deformation of the anchor solid sample 6 during the corrosion process;

[0100] Specifically, such as Figure 5 The diagram shows a deformation measurement module of an embodiment of the anchor body corrosion test system under multi-field coupling of the present invention. The deformation measurement module 3 includes: a deformation data acquisition instrument 301, a thick-walled cylinder 302, and a deformation sensor 303.

[0101] The deformation sensor 303 is used to measure the radial expansion deformation of the mortar 601. There are 3 deformation sensors 303, each spaced 60° apart, arranged radially along the anchor solid sample 6.

[0102] The deformation data acquisition instrument 301 is used to record the radial expansion deformation of the mortar 601;

[0103] The thick-walled cylinder 302 is used to fix the deformation sensor 303. The thick-walled cylinder 302 has three fixing holes through which the deformation sensor 303 is fixed.

[0104] Prestress loading module 4 is used to provide initial prestress to the anchor solid specimen 6;

[0105] Specifically, such as Figure 6 The diagram shows a prestressed loading module of an embodiment of the anchor body corrosion test system under multi-field coupling of the present invention. The prestressed loading module 4 includes a pressure acquisition instrument 401, a clamp 402, a pre-tightening bolt 403, a planar thrust bearing 404, a pressure gauge 405, a pad 406, an internal threaded sleeve 407, and a reaction frame 408.

[0106] The reaction frame 408 is a U-shaped steel frame, and the pad 406 is tightly attached to the outside of the reaction frame 408. The pressure gauge 405 is tightly attached to the outside of the pad 406 and is connected to the pressure acquisition instrument 401. The pressure acquisition instrument 401 monitors and records the tension change of the anchor cable 602. The clamps 402 are respectively arranged at both ends of the anchor cable 602, one end is the fixed end and the other end is the prestressing end. The inside of the clamp 402 is conical. The internal threaded sleeve 407 is tightly attached to the outside of the pressure gauge 405. The inside of the internal threaded sleeve 407 is threaded and the outside of the internal threaded sleeve 407 is square. The preload bolt 403 is screwed into the internal threaded sleeve 407. By rotating the preload bolt 403, a thrust is generated on the anchor cable 602. The planar thrust bearing 404 is located between the preload bolt 403 and the clamp 402.

[0107] Data processing module 5 is used to collect and process data and calculate circumferential and radial stresses, generate a comprehensive life prediction model for the failure of the anchor body sample, and estimate the comprehensive life of the anchor body in the engineering field.

[0108] Specifically, such as Figure 8 The flowchart shown is for calculating the circumferential and radial stresses in an embodiment of the anchor body corrosion test system under multi-field coupling of the present invention. The method for calculating the circumferential and radial stresses includes:

[0109] Based on the radial expansion deformation of mortar 601, the circumferential strain at the outer diameter of mortar 601 is obtained using formulas (1) and (2).

[0110] (1)

[0111] (2)

[0112] In the formula, The circumferential strain at the outer diameter of mortar 601 is... The radial expansion deformation of mortar 601 measured by the first deformation sensor 303. The radial expansion deformation of mortar 601 is measured by the second deformation sensor 303. The radial expansion deformation of mortar 601 is measured by the third deformation sensor 303. The circumferential deformation of anchor solid specimen 6 is given. The outer radius of mortar 601;

[0113] Based on the circumferential strain at the outer diameter of mortar 601, the radial stress at the inner diameter of mortar 601 is obtained using formula (3).

[0114] (3)

[0115] In the formula, For elastic modulus, The radial stress is the inner diameter of the mortar. The inner radius of mortar 601;

[0116] Based on the radial stress of the inner diameter of mortar 601, the circumferential stress of the inner diameter of mortar 601 is obtained through formula (4).

[0117] (4)

[0118] In the formula, Circumferential stress of the inner diameter of mortar 601.

[0119] Specifically, such as Figure 9 The flowchart shown in the embodiment of the anchor body corrosion test system under multi-field coupling of the present invention generates a comprehensive life prediction model for the failure of the anchor body sample and estimates the comprehensive life of the anchor body in the engineering field. The method for generating the comprehensive life prediction model for the failure of the anchor body sample and estimating the comprehensive life of the anchor body in the engineering field includes:

[0120] Based on corrosion experiments under the action of multiple coupling factors, orthogonal design method is adopted, and data is collected through data processing module 5 to obtain the first dataset under the action of multiple coupling factors, which include: temperature factor, stress factor, wet-dry alternation factor and chemical factor.

[0121] Based on the first dataset under the influence of these multiple coupling factors, the key features of the first dataset are obtained through data processing and extraction.

[0122] Based on the data processing module 5, the corresponding circumferential stress is obtained through calculation;

[0123] Based on the corresponding circumferential stress, the corresponding anchor failure state is obtained by using formula (5).

[0124] (5)

[0125] In the formula, This refers to the tensile strength of the mortar.

[0126] Based on the corresponding anchor failure state, the time of the corresponding anchor failure state is determined, and the lifespan of the corresponding anchor failure state is obtained.

[0127] Based on the key features of the first dataset and the corresponding anchor failure lifetime, a neural network algorithm is used to obtain the comprehensive lifetime prediction model for anchor failure samples through formula (6).

[0128] (6)

[0129] In the formula, For the comprehensive life prediction model of anchor solid specimen failure, For the nth time, For temperature, For stress, The interval between dry and wet transitions, The number of times the wet and dry conditions alternate. For the concentration of corrosive ionic solutions, For hydrogen ion concentration, For sulfate ion concentration, Chloride ion concentration, The weighting factor for accelerated corrosion due to temperature, The accelerated corrosion weighting factor of stress The accelerated corrosion weighting factor for the interval between wet and dry cycles. The acceleration corrosion weighting factor based on the number of wet-dry alternations. The concentration-based acceleration corrosion weighting factor Hydrogen ion accelerated corrosion weighting factor The accelerated corrosion weighting factor of sulfate ions. The chloride ion is the weighting factor for accelerating corrosion. Time function under the influence of temperature Time function under stress The time function under the influence of the interval between wet and dry periods. The time function affected by the number of wet and dry alternations. The time function under the influence of concentration The time function under the influence of hydrogen ions The time function under the influence of sulfate ions and This is a time function under the influence of chloride ions;

[0130] The data processing module collects data on anchor bodies from the engineering site to obtain a dataset of anchor bodies under the influence of multiple coupling factors.

[0131] The dataset of the anchor body in the engineering field under the action of multiple field coupling factors is input into the comprehensive life prediction model of the anchor body sample failure to obtain the comprehensive life of the anchor body in the engineering field.

[0132] like Figure 10 The flowchart shown is an embodiment of the anchor corrosion test method under multi-field coupling of the present invention. The present invention provides an anchor corrosion test method under multi-field coupling, which is implemented by an anchor corrosion test system under multi-field coupling. The method includes:

[0133] S1. Design the mortar into a cylindrical shape and wrap it around the anchor cable to obtain an anchor body sample set;

[0134] S2. Place the anchor solid sample set in the prestress loading module, conduct orthogonal experiments under multiple environmental factors through the temperature control module and the corrosion solution circulation module, and measure the crack deformation data set of the anchor solid sample set through the deformation measurement module.

[0135] S3. Based on the crack deformation dataset of the anchor solid sample set, the data processing module is used to obtain the anchor solid sample dataset under the action of multiple field coupling factors.

[0136] S4. Based on the anchor solid sample dataset under the action of multiple field coupling factors, a neural network algorithm is used to obtain the comprehensive life prediction model for anchor solid sample failure.

[0137] S5. Collect environmental data and anchor body data of the engineering site through the data processing module to obtain the dataset of anchor bodies at the engineering site;

[0138] S6. Input the dataset of the anchor body at the engineering site into the comprehensive life prediction model for the failure of the anchor body sample to obtain the predicted life of the anchor body at the engineering site.

[0139] S7. Based on the predicted service life of the anchorages at the project site, and by comparing them with the designed service life of the project, the qualification of the anchorages at the project site is determined. The basis for comparing the designed service life of the project is as follows:

[0140] When the predicted service life is greater than or equal to the design service life, the anchorage body on site for this project is considered qualified.

[0141] When the predicted service life is less than the design service life, the anchor body in the project site is considered to have failed.

[0142] This invention provides a corrosion testing system and method for anchor solids under multi-field coupling. The invention includes a temperature control module 1, a corrosion solution circulation module 2, a deformation measurement module 3, a prestressing loading module 4, and a data processing module 5. The deformation measurement module 3 converts radial deformation monitoring into circumferential deformation monitoring, solving the problem of corrosion damage to sensors caused by the corrosion solution and achieving automated monitoring of sample deformation in corrosive environments. Secondly, the temperature control module 1 and the corrosion solution circulation module 2 achieve automatic control of temperature-accelerated corrosion and automatic adjustment of solution concentration, enabling real-time analysis of the corrosion process. Finally, the data processing module 5 uses a comprehensive life prediction model for anchor solid sample failure to predict the service life of the anchor solid. This system can be applied to monitoring expansion deformation and predicting anchor solid failure during corrosion under multi-field coupling.

[0143] It is understood that the present invention has been described through the above embodiments and should not be construed as limiting the implementation and scope of the present invention. Those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the present invention. Furthermore, under the teachings 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 to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of the present invention.

Claims

1. A multi-field coupling based anchorage body corrosion test system, characterized in that, The system comprises: a temperature control module for providing a set temperature environment for the anchorage body sample; the anchorage body sample comprises an anchor cable and mortar; the mortar is cylindrical and wraps the anchor cable; a corrosion solution circulation module for providing a dry-wet alternating corrosion environment for the anchorage body sample; a deformation measurement module for measuring the cracking deformation of the anchorage body sample in the corrosion process; the deformation measurement module comprises a deformation data acquisition instrument, a thick-walled cylinder and a deformation sensor; the deformation sensor is used for measuring the radial expansion deformation of the mortar, and the number of deformation sensors is three, each being spaced 60° apart and arranged along the radial direction of the anchorage body sample; the deformation data acquisition instrument is used for recording the radial expansion deformation of the mortar; the thick-walled cylinder is used for fixing the deformation sensor, and the thick-walled cylinder has three fixing holes, and the deformation sensor is fixed through the fixing holes; a prestress loading module for providing an initial prestress for the anchorage body sample; a data processing module for collecting and processing data and calculating hoop stress and radial stress, generating a failure comprehensive life prediction model of the anchorage body sample and estimating the comprehensive life of the anchorage body in the engineering field; the method for calculating the hoop stress and the radial stress comprises: according to the radial expansion deformation of the mortar, the hoop strain at the outer diameter of the mortar is obtained through formula (1) and formula (2), wherein ε θ,b is the hoop strain at the outer radius of the mortar, ΔR1 is the radial expansion deformation of the mortar measured by the first deformation sensor, ΔR2 is the radial expansion deformation of the mortar measured by the second deformation sensor, ΔR3 is the radial expansion deformation of the mortar measured by the third deformation sensor, is the hoop deformation of the anchoring body sample, and b is the outer radius of the mortar. according to the hoop strain at the outer diameter of the mortar, the radial stress at the inner diameter of the mortar is obtained through formula (3), where E is the modulus of elasticity, σ is the stress, a is the radius of the mortar core, and b is the radius of the mortar core. r,a where E is the modulus of elasticity, σ is the stress, a is the radius of the mortar core, and b is the radius of the mortar core. according to the radial stress at the inner diameter of the mortar, the hoop stress at the inner diameter of the mortar is obtained through formula (4), In the formula, σ θ,a The hoop stress of the inner diameter of the mortar.

2. The multi-field coupled anchoring body corrosion test system according to claim 1, characterized by, the temperature control module comprises a temperature controller, a heater, a heat sink, a temperature sensor and an incubator; the temperature controller is used for setting and adjusting the target temperature in the incubator and controlling the working state of the heater and the heat sink to maintain the required temperature condition; the heater is used for providing heat to ensure that the temperature in the incubator reaches the set value; the heat sink is used for dissipating heat to ensure that the temperature in the incubator reaches the set value; the temperature sensor is used for monitoring the actual temperature in the incubator in real time and feeding back the actual temperature to the temperature controller; the incubator is used for surrounding the test environment to reduce the influence of external temperature changes.

3. The multi-field coupled anchor corrosion test system of claim 2, wherein, the corrosion solution circulation module comprises 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 with the water pump, the water pump is started to inject the corrosion solution into the corrosion tank, the water level gauge is connected with the water level controller, and the water level controller is closed when the water level reaches the set height; the corrosion tank is a container for the corrosion process of the anchorage body sample, the overflow pipe is arranged at the height limit liquid surface of the corrosion tank, the drain pipe is arranged at the lowest liquid surface of the corrosion tank, and the drain pipe is connected with 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 erosive ion solution is filled in the concentration regulator, and the erosive ion solution is injected into the liquid storage tank when the concentration of the erosive ion solution is lower than a threshold value.

4. The multi-field coupled anchor corrosion test system of claim 3, wherein The concentration regulator comprises 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, and the liquid storage cavity separately stores various erosive ion solutions.

5. The multi-field coupled anchor corrosion test system of claim 1, wherein The prestress loading module comprises a pressure collector, a clamp, a pre-tightening bolt, a plane thrust bearing, a pressure gauge, a pad, an internally threaded sleeve and a counterforce frame. The counterforce frame is a U-shaped steel frame, the pad is tightly attached to the outer side of the counterforce frame, the pressure gauge is tightly attached to the outer side of the pad, the pressure gauge is connected to the pressure collector, the pressure collector monitors and records changes in the anchor cable tension, the clamp is arranged at both ends of the anchor cable, one end being a fixed end and the other end being a prestress application end, the inside of the clamp is conical, the internally threaded sleeve is tightly attached to the outer side of the pressure gauge, the inside of the internally threaded sleeve is threaded, the outside of the internally threaded sleeve is square-shaped, the pre-tightening bolt is screwed into the internally threaded sleeve, and the plane thrust bearing is located between the pre-tightening bolt and the clamp.

6. The multi-field coupled anchor corrosion test system of claim 1, wherein The method for generating the anchor body sample failure comprehensive life prediction model and estimating the comprehensive life of an anchor body in an engineering site comprises: According to the corrosion experiment under the action of multiple field coupling factors, the data processing module is used to collect data to obtain a first data set under the action of multiple field coupling factors, and the multiple field coupling factors include temperature factors, stress factors, dry-wet alternating factors and chemical factors. According to the first data set under the action of the multiple field coupling factors, the key features of the first data set are extracted through data processing. According to the data processing module, the corresponding hoop stress is obtained through calculation. According to the corresponding hoop stress, the corresponding anchor body failure state is obtained through formula (5), σ θ,a ≥σ max (5) wherein σ max is the tensile strength of the mortar; According to the corresponding anchor body failure state, the time of the corresponding anchor body failure state is determined to obtain the life of the anchor body at the time of failure; According to the key features of the first data set and the life of the anchor body at the time of failure, a neural network algorithm is used to obtain an anchor body sample failure comprehensive life prediction model through formula (6), In the formula, F(t1, t2, …, t n ) is a comprehensive life prediction model for failure of anchoring body samples, t n is the nth time, T is temperature, S is stress, W t is the interval time of dry-wet alternation, W n is the number of dry-wet alternation, C p is the concentration of erosive ion solution, is the concentration of hydrogen ion, is the concentration of sulfate ion, is the concentration of chlorine ion, r T is the acceleration corrosion weight factor of temperature, r S is the acceleration corrosion weight factor of 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 alternation, is the acceleration corrosion weight factor of concentration, is the acceleration corrosion weight factor of hydrogen ion, is the acceleration corrosion weight factor of sulfate ion, is the acceleration corrosion weight factor of chlorine ion, t(T) is the time function under the influence of temperature, t(s) is the time function under the influence of stress, t(W t ) is the time function under the influence of the interval time of dry-wet alternation, t(W n ) is the time function under the influence of the number of dry-wet alternation, t(C p ) 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 chlorine ion. The data processing module is used to collect data of an anchor body in an engineering site to obtain a data set of the anchor body in the engineering site under the action of multiple field coupling factors. The method comprises:

7. The method for the corrosion test of anchorage body under multi-field coupling effect is realized by the system for the corrosion test of anchorage body under multi-field coupling effect according to any one of claims 1-6, characterized in that, S1, design the mortar into a cylindrical shape and wrap the anchor cable to obtain an anchor body sample set; ​ S2, the anchor body sample set is placed in a prestress loading module, orthogonal experiments under multiple environmental factors are carried out through a temperature control module and a corrosion solution circulation module, and cracking deformation data sets of the anchor body sample set are obtained through a deformation measurement module; S3, according to the cracking deformation data sets of the anchor body sample set, through a data processing module, the anchor body sample data sets under the action of multiple field coupling factors are obtained; S4, according to the anchor body sample data sets under the action of multiple field coupling factors, a neural network algorithm is used to obtain an anchor body sample failure comprehensive life prediction model; S5, through a data processing module, environmental data and engineering site anchor body data of an engineering site are collected to obtain a data set of the engineering site anchor body; S6, the data set of the engineering site anchor body is input into the anchor body sample failure comprehensive life prediction model to obtain a predicted service life of the engineering site anchor body; S7, according to the predicted service life of the engineering site anchor body, by comparing a design service life, the qualification of the engineering site anchor body is judged, and the basis for comparing the design service life is as follows: When the predicted service life is greater than or equal to the design service life, the engineering site anchor body is qualified, When the predicted service life is less than the design service life, the engineering site anchor body is failed.

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