A method and system for predicting the service life of rubber gaskets for shield segments

Abstract

The present invention discloses a method and system for predicting the service life of a rubber gasket for shield segments, belonging to the technical field of tunnel and underground engineering. The method includes: obtaining the pre-compression strain, ambient water pressure and ambient temperature of the rubber gasket between shield segments; determining the service life of the rubber gasket according to the ambient water pressure, the pre-compression strain and the ambient temperature, in combination with a preset performance degradation threshold, through a rubber residual performance equation; wherein the rubber residual performance equation is constructed based on the pre-compression strain by taking the external water pressure as an influence coefficient and considering the time-temperature superposition principle. It can predict the degree of performance degradation during the service period of the elastic gasket, so as to achieve the purpose of predicting the life of the elastic gasket, in order to timely prevent the water seepage and water inrush disasters of shield tunnels; and solves the problem that the accuracy and authenticity of the life prediction of elastic gaskets in the prior art need to be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of tunnel and underground engineering, and particularly to a method and system for predicting the service life of rubber gaskets for shield segments. Background Technique

[0002] The statements in this part only mention the background techniques related to the present invention and do not necessarily constitute prior art.

[0003] A shield tunnel is an assembled structure composed of segments, bolts, rubber gaskets, etc. The joint of the segment structure is a weak point in tunnel waterproofing. The segment waterproofing structure mainly consists of a gasket groove and a rubber gasket. The joint waterproofing depends on the sealing interface formed after the rubber gasket is compressed. The waterproof performance is closely related to the compression degree and surface roughness characteristics of the sealing interface. The failure of the water-stop structure is one of the main reasons for the occurrence of water leakage diseases. Under the long-term extrusion of the segment structure, problems such as rubber gasket aging and stress relaxation are likely to occur. Coupled with the opening and dislocation of the segment structure, it is extremely easy to form a leakage channel between the sealing interfaces of the rubber gaskets, leading to diseases such as water leakage.

[0004] The rubber gasket is the main component for segment structure waterproofing and is difficult to replace once installed. Therefore, it is particularly important to accurately evaluate its mechanical properties and waterproof performance after long-term service. Currently, many studies are devoted to exploring the performance degradation of the rubber waterproof materials used in rubber gaskets. These studies provide a scientific basis for predicting the expected life of rubber gaskets, but they are studies on performance degradation under single aging conditions.

[0005] However, in the tunnel environment, the rubber material is affected by multiple factors such as long-term compression, external water environment interference, and its own aging. Most of the existing life prediction methods predict the performance of the material from the perspective of the laboratory and do not fully consider the various working environments of the actual rubber gasket. Therefore, the existing methods have the problem of being too one-sided in considering factors, resulting in the need to improve the accuracy of life prediction, and the prediction results cannot restore the impact of the real working environment on the service life of the rubber gasket. Summary of the Invention

[0006] In order to solve the deficiencies of the existing technology, the present invention provides a method, system, electronic device, computer-readable storage medium, and computer program product for predicting the service life of rubber gaskets for shield segments, which can more realistically simulate the environment around the shield tunnel and improve the accuracy of predicting the service life of rubber gaskets.

[0007] In the first aspect, the present invention provides a method for predicting the service life of rubber gaskets for shield segments;

[0008] A method for predicting the service life of rubber gaskets for shield segments includes:

[0009] Obtain the pre-compression strain, ambient water pressure, and ambient temperature of the rubber gasket between the shield segments;

[0010] According to the ambient water pressure, the pre-compression strain, and the ambient temperature, and in combination with a preset performance degradation threshold, determine the service life of the rubber gasket through a rubber residual performance equation;

[0011] Among them, the rubber residual performance equation is constructed based on the pre-compression strain, considering the time-temperature superposition principle, with the external water pressure as the influence coefficient.

[0012] In some embodiments, constructing the rubber residual performance equation based on the pre-compression strain, considering the time-temperature superposition principle, and using the external water pressure as the influence coefficient includes:

[0013] According to the pre-compression strain, obtain the external water pressure that the rubber gasket can resist; according to the external water pressure that the rubber gasket can resist, determine the contact stress of the rubber gasket; according to the external water pressure that the rubber gasket can resist and the contact stress of the rubber gasket, generate a water pressure influence coefficient;

[0014] Based on the water pressure influence coefficient, considering the time-temperature superposition principle and the pre-compression strain, construct the rubber residual performance equation.

[0015] In some embodiments, the water pressure influence coefficient is expressed as:

[0016] ;

[0017] In the formula, represents the external water pressure that the rubber gasket can resist, represents the ambient water pressure at which the rubber gasket works, represents the service life of the rubber gasket; represents the contact stress of the rubber gasket, represents the maximum stress that the rubber gasket can withstand.

[0018] In some embodiments, the rubber residual performance equation is expressed as:

[0019] ;

[0020] In the formula, represents the external water pressure that the rubber gasket can resist, represents the ambient water pressure at which the rubber gasket works, represents the service life of the rubber gasket; represents the contact stress of the rubber gasket, represents the maximum stress that the rubber gasket can withstand, represents the first constant, a represents the second constant, m, n, l, krespectively represent the first parameter to be fitted, represent the pre-compression strain, T 2 represent the actual service temperature of the rubber gasket.

[0021] In some embodiments, the pre-compression strain of the rubber gasket between the shield segments is determined according to the compression amount of the rubber gasket between the shield segments, and the compression amount of the rubber gasket is the difference in the spacing before and after the installation of adjacent shield segments.

[0022] In some embodiments, the performance degradation threshold is determined by performing a waterproof performance test on the aged rubber gasket specimen through a rubber waterproof test device.

[0023] In a second aspect, the present invention provides a system for predicting the service life of a rubber gasket for shield segments;

[0024] A system for predicting the service life of a rubber gasket for shield segments, comprising:

[0025] An acquisition module, configured to: acquire the pre-compression strain, ambient water pressure, and ambient temperature of the rubber gasket between the shield segments;

[0026] A service life prediction module, configured to: determine the service life of the rubber gasket through a rubber residual performance equation according to the ambient water pressure, the pre-compression strain, and the ambient temperature, in combination with a preset performance degradation threshold;

[0027] Wherein, the rubber residual performance equation is constructed based on the pre-compression strain by taking the external water pressure as an influence coefficient and considering the time-temperature superposition principle.

[0028] In a third aspect, the present invention provides an electronic device;

[0029] An electronic device, comprising a memory, a processor, and a computer program stored on the memory, and the processor executes the computer program to implement the steps of the above method for predicting the service life of a rubber gasket for shield segments.

[0030] In a fourth aspect, the present invention provides a computer-readable storage medium;

[0031] A computer-readable storage medium, on which a computer program / instructions are stored, and when the computer program / instructions are executed by a processor, the steps of the above method for predicting the service life of a rubber gasket for shield segments are implemented.

[0032] In a fifth aspect, the present invention provides a computer program product;

[0033] A computer program product includes a computer program / instructions. When the computer program / instructions are executed by a processor, the steps of the above-mentioned method for predicting the service life of the rubber gasket for shield segments are implemented.

[0034] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0035] 1. The technical solution provided by the present invention is not affected by the shape of the rubber gasket. The material performance parameters of the rubber can be measured through indoor tests. Given the environmental temperature, environmental water pressure, and compression amount between shield segments at the engineering site, the degree of performance degradation of the elastic gasket during service can be predicted, so as to achieve the purpose of predicting the life of the elastic gasket, and timely prevent the water seepage and water inrush disasters in the shield tunnel.

[0036] 2. The technical solution provided by the present invention predicts the service life of the rubber gasket by considering the combined effects of engineering pressure and hydrothermal conditions on the actual service time of the rubber gasket, and can more realistically simulate the environment around the shield tunnel.

[0037] 3. The technical solution provided by the present invention does not require on-site detection in the project. Only by substituting the on-site temperature, water pressure, and compression amount of the elastic gasket in the project, the performance and life of the elastic gasket can be predicted, greatly reducing the detection cost and detection difficulty. Description of the Drawings

[0038] The specification drawings forming a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention.

[0039] Figure 1 It is a schematic flow chart of the method for predicting the service life of the rubber gasket for shield segments provided by the embodiment of the present invention;

[0040] Figure 2 It is a schematic structural position diagram before the installation of the shield segment and the rubber gasket provided by the embodiment of the present invention;

[0041] Figure 3 It is a schematic structural position diagram after the installation of the shield segment and the rubber gasket provided by the embodiment of the present invention;

[0042] Figure 4 It is the pre-compression strain provided by the embodiment of the present invention =-0.1 when the fitting schematic diagram of the rubber residual performance prediction equation;

[0043] Figure 5 It is the fitting schematic diagram of the rubber gasket's ability to resist external water pressure provided by the embodiment of the present invention;

[0044] Figure 6Schematic diagram of fitting the contact stress of the rubber gasket provided by the embodiment of the present invention;

[0045] Figure 7 Schematic diagram of the stress-strain curve of the rubber gasket provided by the embodiment of the present invention;

[0046] Figure 8 The pre-compressive strain provided by the embodiment of the present invention =-0.1 and the schematic diagram of predicting the residual properties of rubber corresponding to an engineering temperature of 298K. Detailed implementation manners

[0047] It should be noted that the following detailed description is exemplary and is intended to provide further illustration of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention belongs.

[0048] It should be noted that the terms used herein are only for describing specific implementation manners and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular forms are also intended to include the plural forms. In addition, it should be understood that the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those clearly listed steps or units, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0049] In the case of no conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0050] Embodiment 1

[0051] In the prior art, more attention has been paid to the prediction of the service life of rubber gaskets under a single aging condition, and it is impossible to restore the influence of the real engineering environment on the deterioration performance of rubber gaskets, resulting in insufficient accuracy of the service life prediction; therefore, the present invention provides a method for predicting the service life of rubber gaskets for shield segments, considering the service life prediction of rubber gaskets under the combined influence of environmental water pressure, engineering pressure and hydrothermal conditions.

[0052] Next, in combination with Figures 1 - 8 , a method for predicting the service life of rubber gaskets for shield segments disclosed in this embodiment will be described in detail. The method for predicting the service life of rubber gaskets for shield segments includes:

[0053] S1. Obtain the pre-compressive strain, environmental water pressure and environmental temperature of the rubber gasket between shield segments 1.

[0054] In this embodiment, the pre-compression strain of the rubber gasket is determined according to the compression amount of the rubber gasket in actual engineering. By measuring the distance between two shield segments 1 before compression when the shield segment 1 is not installed and the distance between two shield segments 1 after compression when the shield segment 1 is installed and compressed , the difference between the two is the compression amount of the rubber gasket.

[0055] h 0 Specifically, the pre-compression strain of the rubber gasket between the shield segments 1 is expressed as:

[0056] (1)

[0057] In the formula, represents the pre-compression strain, represents the distance between two shield segments 1 before compression when not installed, represents the distance between two shield segments 1 after installation.

[0058] S2. According to the environmental water pressure, pre-compression strain and environmental temperature, combined with the preset performance degradation threshold, the service life of the rubber gasket is determined through the rubber residual performance equation.

[0059] Among them, the rubber residual performance equation is expressed as:

[0060] (2)

[0061] In the formula, represents that the rubber gasket can resist the external water pressure, represents the environmental water pressure at which the rubber gasket works, represents the service life of the rubber gasket; represents the contact stress of the rubber gasket, represents the maximum stress that the rubber gasket can withstand, represents the first constant, a represents the second constant, m, n, l, k respectively represent the first parameter to be fitted, represents the pre-compression strain, T 2 represents the environmental temperature, that is, the actual service temperature of the rubber gasket.

[0062] Specifically, substitute the environmental water pressure, pre-compression strain, and environmental temperature into the rubber residual performance equation, and use MATLAB software to plot the rubber residual performance prediction curve corresponding to the above rubber residual performance equation. Then, substitute the performance degradation threshold into the rubber residual performance prediction curve to obtain the service life of the rubber gasket.

[0063] In this embodiment, the performance degradation threshold is determined by testing the waterproof performance of the aged rubber gasket specimen with an existing rubber waterproof testing device. For rubber gaskets of the same material, only one test is required to achieve universality in practical applications.

[0064] Specifically, first, fix the pre-compression strain, install rubber gasket specimens corresponding to different aging temperatures and aging times in the rubber waterproof testing device, and use the rubber waterproof testing device to test the waterproof performance of the aged rubber gasket specimens; then, record the aging temperatures and aging times corresponding to the leaking rubber gasket specimens, and obtain the residual performance of the specimens through the rubber residual performance equation (the following formula (12)) corresponding to the accelerated aging time in the experiment; under the same pre-compression strain, take the minimum value of the residual performance of the specimens corresponding to the leaking rubber gasket specimens as the performance degradation threshold of the rubber gasket under this pre-compression strain condition; then change the pre-compression strain of the rubber gasket specimens, and perform the above steps to obtain the performance degradation thresholds corresponding to different pre-compression strains and different aging temperatures.

[0065] In practical applications, if the pre-compression strain obtained in S1 has a corresponding value in the measured data, it is directly adopted; otherwise, taking the aging temperature and pre-compression strain as independent variables and the performance degradation threshold as the dependent variable, and using the above experimental data for fitting through MATLAB software, the performance degradation thresholds corresponding to any pre-compression strain and aging temperature can be obtained.

[0066] Here, the rubber waterproof testing device is a common device in existing rubber tests, and its specific structure and usage details will not be elaborated here.

[0067] In order to quantify the performance degradation law of the rubber gasket under the combined action of compression amount, temperature, aging, and water pressure, and improve the accuracy of predicting the service life of the rubber gasket; as an implementation method, before performing S2, it further includes:

[0068] Taking the external water pressure as the influence coefficient, considering the time-temperature superposition principle, and constructing a rubber residual performance equation based on the pre-compression strain; specifically including:

[0069] (1) According to the pre-compression strain, obtain the external water pressure that the rubber gasket can resist; according to the external water pressure that the rubber gasket can resist, determine the contact stress of the rubber gasket; according to the external water pressure that the rubber gasket can resist and the contact stress of the rubber gasket, generate a water pressure influence coefficient.

[0070] The greater the contact stress of the rubber gasket, the greater the external water pressure it can resist, approximately showing a logarithmic relationship; the external water pressure that the rubber gasket can resist has an exponential relationship with the pre-compression strain of the rubber. Specifying the pre-compression strain can determine the external water pressure that can be resisted, and thus determine the contact stress of the rubber gasket.

[0071] Among them, the ability of the rubber gasket to resist external water pressure is expressed as:

[0072] (3)

[0073] In the formula, 、 and respectively represent the second parameters to be fitted, represents the pre-compression strain.

[0074] The contact stress of the rubber gasket is expressed as:

[0075] (4)

[0076] In the formula, represents the contact stress of the rubber gasket, represents the ability of the rubber gasket to resist external water pressure, 、 and represent the parameters to be fitted.

[0077] During actual use, the contact stress of the rubber gasket shall not exceed the maximum stress that the rubber can withstand, and similarly, the external water pressure shall not exceed the maximum water pressure that the rubber gasket can resist. Therefore, the water pressure influence coefficient regarding the external water pressure is expressed as:

[0078] (5)

[0079] In the formula, represents the ability of the rubber gasket to resist external water pressure, represents the environmental water pressure under which the rubber gasket works, represents the service life of the rubber gasket; represents the contact stress of the rubber gasket, represents the maximum stress that the rubber gasket can withstand, which can be represented by the peak stress of the stress-strain curve of the rubber gasket.

[0080] Here, the stress-strain curve of the rubber gasket is a curve obtained by visualizing the stress-strain equation of the rubber gasket through MATLAB. The stress-strain equation of the rubber gasket is expressed as:

[0081] (6)

[0082] In the formula, C 10 、C 01 are the material parameters in the constitutive model of the rubber material, represents the rubber strain, represents the rubber stress.

[0083] (2) Considering the time-temperature superposition principle and pre-compression strain, the temperature is equivalently reflected by the chemical reaction rate.

[0084] Specifically, first, according to the pre-exponential factor, molar gas constant, chemical reaction activation energy, and test temperature, the expression of the chemical reaction rate is determined; then, the pre-compression strain is used to represent the pre-exponential factor and the ratio of the chemical reaction activation energy to the molar constant, and the expression of the chemical reaction rate is updated.

[0085] Among them, the chemical reaction rate K is expressed as:

[0086] (7)

[0087] In the formula, A represents the pre-exponential factor, R represents the molar gas constant, with the unit of J / (mol·K); E represents the chemical reaction activation energy, with the unit of J / mol; T represents the test temperature, with the unit of K.

[0088] Since the parameters A and E / R have a great correlation with the pre-compression strain , so ε pr can be used to represent the parameters A and E / R , expressed as:

[0089] (8)

[0090] (9)

[0091] In the formula, m , n , l , k respectively represent the first fitting parameters to be determined, represents the pre-compression strain.

[0092] (3) Based on the water pressure influence coefficient, a residual performance equation of the rubber material based on the pre-compression strain is constructed.

[0093] Generally speaking, the degree of deterioration of the rubber performance is expressed as:

[0094] (10)

[0095] In the formula, represents the residual performance of the rubber gasket in the engineering environment, represents the water pressure influence coefficient, Indicates the residual performance of the rubber gasket under the condition of no external water pressure environment B Indicates the first constant a Indicates the second constant t Indicates the reaction time

[0096] Then the residual performance of the rubber gasket under the condition of no external water pressure environment is expressed as:

[0097] (11)

[0098] Substituting formulas (7), (8), and (9) into formula (11), the accelerated aging time in the test can be obtained t 1 The corresponding rubber residual performance equation is expressed as:

[0099] (12)

[0100] The service time of the rubber gasket in the project can be expressed as the service life t 2 , which is expressed as:

[0101] (13)

[0102] In the formula, t 1 Indicates the accelerated aging time, Δ T Indicates the actual service temperature of the rubber gasket T 2 The difference between the reciprocal of the accelerated aging test temperature T 1 And the reciprocal of the accelerated aging test temperature .

[0103] Substituting formulas (5), (12), and (13) into formula (10), the service life t 2 The corresponding rubber residual performance prediction equation is expressed as:

[0104] (14)

[0105] Furthermore, in this embodiment, the compression set tested by the pre-compression test device is used as an index for the degree of deterioration of the rubber residual performance, and the accelerated aging time t 1 The first fitting parameter in the corresponding rubber residual performance prediction equation m, n, l, k ; By testing the maximum water pressure that can be resisted and the contact stress of the rubber gasket corresponding to different pre-compression strains through the rubber waterproof test device, the second fitting parameter and the fitting parameter in the influence coefficient of the external water pressure are fitted

[0106] Specifically, first, a test rubber specimen of the same material is customized according to the engineering rubber gasket; then, the test pre-compression amount is set, and the rubber specimen is pre-compressed using a pre-compression test device; then, multiple aging temperatures and aging times are set, and the rubber specimen is subjected to multiple hydrothermal accelerated aging tests; then, the pre-compression test device is placed in water for constant temperature hydrothermal aging, and subsequently, the rubber compression set is measured.

[0107] The rubber compression set is expressed as:

[0108] (15)

[0109] In the formula, Cs represents the rubber compression set, h 2 represents the height of the unaged rubber specimen, with the unit of mm; h r is the height of the limiter in the pre-compression test device, with the unit of mm; h 3 represents the height of the rubber specimen after aging, with the unit of mm.

[0110] Finally, the rubber compression set is used as the actual value of formula (12) for fitting the parameters l 、 k 、 m 、 n ,which is expressed as:

[0111] (16)

[0112] When fitting the parameters to be fitted in the influence coefficient of the external water pressure, the pre-compression strain is fixed, and the maximum water pressure that can be resisted and the contact stress of the rubber gasket corresponding to different pre-compression strains are measured through a rubber waterproof test device. The maximum water pressure that can be resisted and the contact stress are substituted into formulas (3) and (4) to determine the second parameter to be fitted and the parameter to be fitted.

[0113] Here, the pre-compression test device is a common device in existing rubber tests, and its specific structure and usage details will not be elaborated here.

[0114] Next, combined with specific test data, the above fitting process will be further explained.

[0115] Taking the pre-compression strain =-0.1 as an example, the actual measured values of the rubber residual properties are as follows in the table:

[0116] Table 1 Actual measured values of the rubber residual property f(p) at different aging temperatures and different aging times

[0117]

[0118] When the pre-compression strain When [[[parameter]]]= -0.1 and the engineering temperature is 298 K (25 °C), the fitting formula (11) is obtained, and the fitting graph is as Figure 3 shown, and the corresponding fitting parameters are as follows in the table:

[0119] Table 2 Example of the first parameter to be fitted

[0120]

[0121] Then, the maximum water pressure that can be resisted corresponding to different pre-compression strains and the contact stress of the rubber gasket are tested through the rubber waterproof test device, and the parameters to be fitted in the influence coefficient of the external water pressure are fitted, that is, the second parameter to be fitted in formula (3) and the parameter to be fitted in formula (4).

[0122] The test data and the fitting curve are as Figure 4 and Figure 5 shown. Exemplarily, the corresponding fitting parameters are as follows in the table:

[0123] Table 3 Examples of the second parameter to be fitted and the parameter to be fitted

[0124]

[0125] For the pre-compression strain of the rubber gasket [[[parameter]]]= -0.1, the maximum water pressure that can be resisted Ws [[[parameter]]]= 0.582 MPa, and it is calculated that σ 1 [[[parameter]]]= 0.539 MPa;

[0126] When the pre-compression strain [[[parameter]]]= -0.1, the material parameter C 10 [[[parameter]]]= 1.09 、C 01 [[[parameter]]]= 0.1, and the stress-strain curve of the rubber gasket is as Figure 6 shown.

[0127] The peak stress σ max [[[parameter]]]= 38.23 MPa. When there is no influence of water pressure at the engineering site (i.e., W 1 [[[parameter]]]= 0), the influence coefficient of the external water pressure , so when there is no water pressure outside the shield tunnel, there is no need to correct the predicted service life of the rubber gasket through pressure.

[0128] When there is no influence of water pressure at the engineering site (i.e., W 1 [[[parameter]]]= 0) and the pre-compression strain When [[ID=]]=-0.1 and the engineering temperature is 298 K (25 °C), substituting the parameters determined by fitting into Equation (15), the prediction equation for the residual properties of the rubber corresponding to the service time obtained is: . The corresponding performance change curve of the rubber gasket is as Figure 5 shown. In the previous step, the deterioration threshold was determined to be 0.86, and the service time corresponding to this deterioration threshold is the service life of the rubber gasket, which is 38.89 years.

[0129] Only changing the water pressure at the engineering site, when W 1 = 0.1 MPa, , when the performance deterioration threshold is 0.86, the service life of the rubber gasket is 14.74 years.

[0130] When W 1 = 0.2 MPa, , when the performance deterioration threshold is 0.86, the service life of the rubber gasket is 9.17 years.

[0131] When W 1 = 0.3 MPa, , when the performance deterioration threshold is 0.86, the service life of the rubber gasket is 6.35 years.

[0132] Example Two

[0133] This example discloses a prediction system for the service life of rubber gaskets for shield segments, including:

[0134] An acquisition module, configured to: acquire the pre-compression strain, ambient water pressure, and ambient temperature of the rubber gasket between shield segments 1;

[0135] A service life prediction module, configured to: determine the service life of the rubber gasket based on the ambient water pressure, the pre-compression strain, and the ambient temperature, in combination with a preset performance deterioration threshold, through a rubber residual property equation;

[0136] Among them, the rubber residual property equation is constructed based on the pre-compression strain, considering the time-temperature superposition principle, with the external water pressure as the influence coefficient.

[0137] It should be noted here that the above acquisition module and service life prediction module correspond to the steps in Example One. The examples and application scenarios implemented by the above modules and the corresponding steps are the same, but are not limited to the content disclosed in Example One. It should be noted that the above modules, as part of the system, can be executed in a computer system such as a set of computer executable instructions.

[0138] Example Three

[0139] Embodiment III of the present invention provides an electronic device, including a memory, a processor, and computer instructions stored on the memory and running on the processor. When the computer instructions are run by the processor, the steps of the above-mentioned service life prediction method for the shield segment rubber gasket are completed.

[0140] Embodiment IV

[0141] Embodiment IV of the present invention provides a computer-readable storage medium for storing computer instructions. When the computer instructions are executed by a processor, the steps of the above-mentioned service life prediction method for the shield segment rubber gasket are completed.

[0142] Embodiment V

[0143] Embodiment V of the present invention provides a computer program product, including a computer program / instructions. When the computer program / instructions are executed by a processor, the steps of the above-mentioned service life prediction method for the shield segment rubber gasket are implemented.

[0144] The present invention is described with reference to the flowcharts and / or block diagrams of methods, apparatuses (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, and the combination of processes and / or blocks in the flowchart and / or block diagram, can be realized by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing devices generate a device for realizing the functions specified in one process Figure 1 one process or multiple processes and / or blocks Figure 1 one block or multiple blocks.

[0145] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer-readable memory generate a manufactured product including an instruction device, and the instruction device realizes the functions specified in one process Figure 1 one process or multiple processes and / or blocks Figure 1 one block or multiple blocks.

[0146] These computer program instructions can also be loaded onto a computer or other programmable data processing device, and a series of operation steps are executed on the computer or other programmable device to generate a computer-implemented process. Thus, the instructions executed on the computer or other programmable device provide steps for realizing the functions specified in one process Figure 1 one process or multiple processes and / or blocks Figure 1 one block or multiple blocks.

[0147] In the above embodiments, the descriptions of the respective embodiments have their own focuses. For parts not detailed in a certain embodiment, reference may be made to the relevant descriptions of other embodiments.

[0148] The foregoing is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A method for predicting the service life of rubber sealing pads of shield segments, characterized in that: include: Obtain the pre-compression strain, ambient water pressure and ambient temperature of the rubber seal between shield segments; According to the environmental water pressure, the pre-compression strain and the environmental temperature, combined with a preset performance degradation threshold, the service life of the rubber sealing gasket is determined by a rubber residual performance equation; The rubber residual performance equation is constructed based on the pre-compression strain, taking the external water pressure as the influence coefficient and considering the time-temperature superposition principle; Taking the external water pressure as the influence coefficient and considering the time-temperature superposition principle, the rubber residual performance equation based on the pre-compression strain includes: According to the pre-compression strain, the external water pressure that the rubber sealing gasket can resist is obtained; according to the external water pressure that the rubber sealing gasket can resist, the contact stress of the rubber sealing gasket is determined; according to the external water pressure that the rubber sealing gasket can resist and the contact stress of the rubber sealing gasket, the water pressure influence coefficient is generated; Based on the water pressure influence coefficient, the rubber residual performance equation is constructed by considering the time-temperature superposition principle and the pre-compression strain; The water pressure influence coefficient is expressed as: ； In the formula, It means that the rubber seal can resist external water pressure. Indicates the environmental water pressure of the rubber sealing gasket. Indicates the service life of rubber sealing gasket; Indicates the contact stress of the rubber seal. Indicates the maximum stress the rubber seal can withstand.

2. The method for predicting the service life of rubber sealing pads of shield segments according to claim 1, characterized in that: The rubber residual performance equation is expressed as: ； In the formula, It means that the rubber seal can resist external water pressure. Indicates the environmental water pressure of the rubber sealing gasket. Indicates the service life of rubber sealing gasket; Indicates the contact stress of the rubber seal. Indicates the maximum stress that the rubber seal can withstand. represents the first constant, represents the second constant, 、 、 、 They represent the first parameters to be fitted, represents the pre-compression strain, Indicates the actual service temperature of the rubber sealing gasket.

3. The method for predicting the service life of rubber sealing pads of shield segments according to claim 1, characterized in that: The pre-compression strain of the rubber sealing pads between the shield segments is determined according to the compression amount of the rubber sealing pads between the shield segments. The compression amount of the rubber sealing pads is the difference in spacing between adjacent shield segments before and after installation.

4. The method for predicting the service life of rubber sealing pads of shield segments according to claim 1, characterized in that: The performance degradation threshold is determined by conducting a waterproof performance test on an aged rubber sealing gasket sample using a rubber waterproof testing device.

5. A shield segment rubber sealing gasket service life prediction system, characterized in that: include: An acquisition module is configured to: acquire the pre-compression strain of the rubber sealing pad between the shield segments, the ambient water pressure and the ambient temperature; A service life prediction module is configured to: determine the service life of the rubber sealing gasket through a rubber residual performance equation according to the environmental water pressure, the pre-compression strain and the environmental temperature in combination with a preset performance degradation threshold; The rubber residual performance equation is constructed based on the pre-compression strain, taking the external water pressure as the influence coefficient and considering the time-temperature superposition principle; Taking the external water pressure as the influence coefficient and considering the time-temperature superposition principle, the rubber residual performance equation based on the pre-compression strain includes: According to the pre-compression strain, the external water pressure that the rubber sealing gasket can resist is obtained; according to the external water pressure that the rubber sealing gasket can resist, the contact stress of the rubber sealing gasket is determined; according to the external water pressure that the rubber sealing gasket can resist and the contact stress of the rubber sealing gasket, the water pressure influence coefficient is generated; Based on the water pressure influence coefficient, the rubber residual performance equation is constructed by considering the time-temperature superposition principle and the pre-compression strain; The water pressure influence coefficient is expressed as: ； In the formula, It means that the rubber seal can resist external water pressure. Indicates the environmental water pressure of the rubber sealing gasket. Indicates the service life of rubber sealing gasket; Indicates the contact stress of the rubber seal. Indicates the maximum stress that the rubber gasket can withstand; The rubber residual performance equation is expressed as: ； In the formula, It means that the rubber seal can resist external water pressure. Indicates the environmental water pressure of the rubber sealing gasket. Indicates the service life of rubber sealing gasket; Indicates the contact stress of the rubber seal. Indicates the maximum stress that the rubber seal can withstand. represents the first constant, represents the second constant, 、 、 、 They represent the first parameters to be fitted, represents the pre-compression strain, Indicates the actual service temperature of the rubber sealing gasket.

6. An electronic device comprising a memory, a processor and a computer program stored in the memory, characterized in that: The processor executes the computer program to implement the steps of the method for predicting the service life of shield segment rubber sealing pads as described in any one of claims 1-4.

7. A computer-readable storage medium having a computer program / instruction stored thereon, characterized in that: When the computer program / instruction is executed by a processor, the steps of the method for predicting the service life of rubber sealing pads of shield segments as described in any one of claims 1 to 4 are implemented.

8. A computer program product comprising a computer program / instructions, characterized in that When the computer program / instruction is executed by a processor, the steps of the method for predicting the service life of rubber sealing pads of shield segments as described in any one of claims 1 to 4 are implemented.

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