Risk assessment method, system, terminal equipment and medium for performance failure of shield tail sealing grease based on multiple factor influences

Abstract

The application discloses a shield tail sealing grease performance failure risk assessment method and system based on the influence of multiple factors, a terminal device and a medium, and relates to the technical field of shield engineering. The method comprises the following steps: identifying shield tail sealing grease performance failure influencing factors including environmental factors, material factors and exogenous medium mixing factors; quantifying the factors according to a preset scoring standard to obtain a first performance index score set; constructing a simulated environment based on the environmental factors and testing to obtain a second performance index score set; integrating the scores to obtain a comprehensive performance score, and dividing the failure risk level according to a preset threshold. The application scientifically quantifies the risk of shield tail sealing grease performance failure through multi-factor identification, double-path scoring and weight integration, avoids the limitations of single evaluation, provides accurate basis for grease operation and maintenance, reduces engineering risks, and ensures safe and efficient shield construction.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of shield engineering, and in particular to a shield tail sealing grease performance failure risk assessment method and system based on multiple factor influences, a terminal device, and a medium. BACKGROUND

[0002] With the rapid development of urban rail transit and tunnel engineering, the shield method is widely used in subway and cross-sea tunnel construction due to its strong adaptability to strata, high construction safety and efficiency, and high degree of mechanization. Shield tail sealing grease, as a core consumable of the shield machine, is used to fill the gap between the shield tail and the segment of the shield machine, and to block the intrusion of external media such as groundwater, silt, and slurry. Its performance directly determines the construction safety and engineering efficiency, especially in complex environments such as the seabed and high water pressure, where higher performance is required.

[0003] Existing technologies focus on the basic performance indicators of shield tail sealing grease and do not consider the comprehensive influence of environmental factors on grease performance, such as seawater immersion time, sea salt concentration, and working temperature. They also do not take into account the influence of external media such as silt and slurry mixing, and lack a failure risk evaluation system under the synergistic action of multiple factors. The single performance indicator evaluation or the neglect of key influencing factors cannot fully reflect the actual failure risk of grease in complex environments, which may lead to misjudgment of grease performance and cause major engineering accidents such as water seepage, shield machine shutdown, and ground collapse.

[0004] Therefore, there is an urgent need for an evaluation method for shield tail sealing grease that considers multiple influencing factors and scientifically quantifies performance failure risk to fill the gap in existing technologies. SUMMARY

[0005] The technical problem to be solved by the present application is that in the existing technology of the shield engineering field, when evaluating the performance failure risk of shield tail sealing grease, the quantitative risk of multiple environmental factors and external media is not comprehensively related, and the synergistic evaluation of experimental testing and standard scoring is not considered, and there is a lack of risk level division logic for dynamic adaptation scenarios, leading to one-sided evaluation, inaccurate risk warning, and difficulty in ensuring construction safety. Therefore, an effective solution is needed to solve the above technical problems.

[0006] To solve the above technical problems, the technical solution adopted by the present application is as follows:

[0007] In a first aspect, the present application provides a shield tail sealing grease performance failure risk assessment method based on multiple factor influences, which comprises:

[0008] Identifying performance failure influencing factors of shield tail sealing grease, wherein the performance failure influencing factors of shield tail sealing grease include environmental factors, material factors, and external media mixing factors;

[0009] Based on the preset scoring standard, the performance failure influence factors of the shield tail sealing grease are quantified to obtain a first performance index score set of the shield tail sealing grease;

[0010] Based on the environmental factors, a simulation environment is constructed, and performance testing is performed on the shield tail sealing grease in the simulation environment to obtain a second performance index score set of the shield tail sealing grease;

[0011] The first performance index score set and the second performance index score set of the shield tail sealing grease are integrated to obtain a comprehensive performance score;

[0012] Based on the preset risk level division threshold and the comprehensive performance score, the failure risk level of the shield tail sealing grease is divided.

[0013] In an implementation manner, the performance failure influence factors of the shield tail sealing grease are identified, including:

[0014] The environmental factors are collected, wherein the environmental factors include soaking time, sea salt concentration, working environment temperature, and working environment water pressure, the soaking time is the time for which the shield tail sealing grease is soaked in water in a large area, the sea salt concentration is the concentration of sea salt in the seawater in which the shield tail sealing grease is soaked, the working environment temperature is the average temperature in the working environment of the shield tail sealing grease, and the working environment water pressure is the average water pressure in the working environment of the shield tail sealing grease;

[0015] The material factors are detected, wherein the material factors include harmful substance content, and the harmful substance content is the content of harmful substances brought in or generated in the manufacturing and working process of the shield tail sealing grease;

[0016] The exogenous medium mixing factors are detected, wherein the exogenous medium mixing factors include silt content and mud content, the silt content is the mass ratio of silt mixed in the shield tail sealing grease during work, and the mud content is the mass ratio of mud mixed in the shield tail sealing grease during work.

[0017] In an implementation manner, the first performance index score set includes adhesion score, shear strength score, pumpability score, and environmental protection performance score, and the first performance index score set of the shield tail sealing grease is obtained by quantifying the performance failure influence factors of the shield tail sealing grease based on the preset scoring standard, including:

[0018] Based on the soaking time, the sea salt concentration, the working environment temperature, the silt content, and the mud content, the adhesion score is determined by using a preset scoring standard table;

[0019] determining the shearing strength score using a preset scoring standard table based on the sea salt concentration, the working environment temperature, and the mud content;

[0020] determining the pumping property score using a preset scoring standard table based on the sea salt concentration, the working environment temperature, the silt content, and the mud content;

[0021] determining the environmental protection performance score using a preset scoring standard table based on the harmful substance content.

[0022] In an implementation manner, the second performance index score set includes a corrosion resistance score, the simulation environment is constructed based on the environmental factors, the performance test of the shield tail sealing grease is performed in the simulation environment, and the second performance index score set of the shield tail sealing grease is obtained, including:

[0023] obtaining a sample of the shield tail sealing grease;

[0024] constructing a simulation seawater environment consistent with the working environment of the shield tail sealing grease based on the environmental factors;

[0025] immersing the sample of the shield tail sealing grease in the simulation seawater environment, and after immersing for a preset time, taking out the sample and drying;

[0026] calculating the percentage of mass loss of the sample before and after immersion, and determining the corrosion resistance score using a preset scoring standard table.

[0027] In an implementation manner, the second performance index score set includes a water sealing resistance score, the simulation environment is constructed based on the environmental factors, the performance test of the shield tail sealing grease is performed in the simulation environment, and the second performance index score set of the shield tail sealing grease is obtained, further including:

[0028] obtaining a sample of the shield tail sealing grease;

[0029] uniformly applying and tamping the sample on the bottom metal mesh of a sealing barrel at a preset thickness;

[0030] filling a preset volume of water above the sample applied in the sealing barrel;

[0031] sealing the sealing barrel, and pressurizing the sealing barrel through an air inlet pipe of the sealing barrel, so that the water pressure in the sealing barrel is the same as the working environment water pressure;

[0032] maintaining the water pressure in the sealing barrel for a preset time, recording the leakage and leakage time, and determining the water sealing resistance score using a preset scoring standard table.

[0033] In an implementation manner, the integrating the first performance index score set and the second performance index score set of the tail-seal grease obtains a comprehensive performance score, including:

[0034] At least two performance index scores in the first performance index score set and the second performance index score set of the tail-seal grease are selected;

[0035] The selected performance indexes are weighted, and the weights are normalized;

[0036] Based on the normalized weights, the selected performance index scores are integrated to obtain a comprehensive performance score, and the expression is:

[0037]

[0038] wherein, is a weight of the selected performance index score in the weight vector, , is the selected performance index score, is a total number of the selected performance index scores, is a risk comprehensive score.

[0039] In an implementation manner, the dividing the failure risk level of the tail-seal grease based on the preset risk level division threshold and the comprehensive performance score includes:

[0040] A division rule of the failure risk level of the tail-seal grease is constructed, wherein the division rule includes a risk level division threshold, and the risk level is proportional to the performance failure risk of the tail-seal grease;

[0041] The comprehensive performance score of the tail-seal grease is compared with the risk level division threshold to obtain the risk level of the tail-seal grease;

[0042] Based on the risk level of the tail-seal grease, a risk indication is made for the tail-seal grease.

[0043] In a second aspect, the embodiments of the present application also provide a tail-seal grease performance failure risk assessment system based on multiple factors, and the system includes:

[0044] A recognition factor module is configured to recognize performance failure influencing factors of the tail-seal grease, wherein the performance failure influencing factors of the tail-seal grease include environmental factors, material factors, and exogenous medium mixing factors;

[0045] ​​The first performance index score set acquisition module is configured to quantize the performance failure influence factor of the shield tail sealing grease based on a preset scoring standard, and obtain a first performance index score set of the shield tail sealing grease.

[0046] The second performance index score set acquisition module is configured to construct a simulation environment based on the environmental factor, perform performance testing on the shield tail sealing grease, and obtain a second performance index score set of the shield tail sealing grease.

[0047] The comprehensive performance score integration module is configured to integrate the first performance index score set and the second performance index score set of the shield tail sealing grease, and obtain a comprehensive performance score.

[0048] The failure risk grade division module is configured to divide the failure risk grade of the shield tail sealing grease based on a preset risk grade division threshold and the comprehensive performance score.

[0049] In a third aspect, an embodiment of the present application further provides a terminal device, which comprises a memory, a processor, and a shield tail sealing grease performance failure risk assessment program based on multiple factor influences stored in the memory and executable on the processor.

[0050] In a fourth aspect, an embodiment of the present application further provides a computer readable storage medium, which stores a shield tail sealing grease performance failure risk assessment program based on multiple factor influences, and when the shield tail sealing grease performance failure risk assessment program based on multiple factor influences is executed by a processor, the steps of the shield tail sealing grease performance failure risk assessment method based on multiple factor influences in any of the above solutions are implemented.

[0051] Beneficial effects: a shield tail sealing grease performance failure risk assessment method, system, terminal device and medium based on the influence of multiple factors, related to the technical field of shield engineering, the method first identifies the performance failure influence factors of the shield tail sealing grease, wherein the performance failure influence factors of the shield tail sealing grease include environmental factors, material factors, and exogenous medium mixing factors. Subsequently, based on the preset scoring standard, the performance failure influence factors of the shield tail sealing grease are quantified to obtain a first performance index score set of the shield tail sealing grease, and a simulated environment is constructed based on the environmental factors, and the performance of the shield tail sealing grease is tested in the simulated environment to obtain a second performance index score set of the shield tail sealing grease. After obtaining the first performance index score set and the second performance index score set, the comprehensive performance score is obtained by integrating the two sets. Finally, based on the preset risk level division threshold and the comprehensive performance score, the failure risk level of the shield tail sealing grease is divided. The present application breaks through the limitation of single factor evaluation by identifying performance failure influence factors in multiple dimensions, and comprehensively covers the key variables affecting grease failure. At the same time, the performance score is obtained by combining standard quantification and simulated environment testing, which ensures that the score is more suitable for actual working conditions. Further, by integrating the score and the grade division, the precise quantification and clear determination of grease failure risk are realized, which provides a scientific basis for the use and maintenance of grease in shield construction, effectively reduces the engineering safety risk caused by grease failure, and improves the construction safety and efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0052] Figure 1 The flowchart of the specific implementation mode of the shield tail sealing grease performance failure risk assessment method based on multiple factor influences provided by the embodiments of the present application is provided.

[0053] Figure 2 The principle block diagram of the shield tail sealing grease performance failure risk assessment device based on multiple factor influences provided by the embodiments of the present application is provided.

[0054] Figure 3 The internal structure principle block diagram of the terminal device provided by the embodiments of the present application is provided. DETAILED DESCRIPTION

[0055] In order to make the purpose, technical scheme and effect of the present application more clear and definite, the present application will be further described in detail below with reference to the drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.

[0056] The flowchart shown in the drawings is only an example and does not necessarily include all contents and operations or steps, nor does it necessarily execute in the order described. For example, some operations or steps can be decomposed, combined or partially combined, so the actual execution order may be changed according to the actual situation.

[0057] It should be understood that the terms used in the specification of the application are only for the purpose of describing specific embodiments and are not intended to limit the application. As used in the specification and the appended claims of the application, the singular forms "a," "an," and "the" are intended to include the plural forms unless the context clearly indicates otherwise.

[0058] It should be understood that, in order to facilitate the clear description of the technical solutions of the embodiments of the application, in the embodiments of the application, the terms "first", "second", etc. are used to distinguish the same items or similar items with basically the same function and role. For example, the first control information and the second control information are only used to distinguish different control information, and do not limit the order.

[0059] The skilled in the art can understand that the terms "first", "second", etc. do not limit the quantity and execution order, and the terms "first", "second", etc. also do not limit the difference.

[0060] It should also be understood that the term "and / or" used in the specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes these combinations.

[0061] With the rapid development of urban rail transit network, tunnel construction has entered a stage of rapid development. Shield method is widely used in urban subway tunnel construction due to its strong stratum adaptability, construction safety, high degree of mechanization and other advantages. Shield tail sealing grease is a key consumable in shield construction, which is used to fill the gap between the shield tail and the segment to prevent external media such as underground water, silt and slurry from invading the tunnel. Its performance directly affects the construction safety, engineering cost and efficiency, especially in complex geological environmental conditions (such as high water pressure, sandy pebble stratum). If the shield tail sealing grease deteriorates due to environmental factors, water seepage problems will occur inside the shield, which will eventually lead to ground subsidence and other major engineering accidents. Therefore, attention must be paid to the failure of the sealing grease during shield tunneling.

[0062] The various means adopted by the prior art mainly focus on the basic performance indicators of shield tail sealing grease, rarely consider the influence degree of different environmental factors on the performance indicators of the sealing grease, and there is no shield tail sealing failure risk evaluation of multiple environmental factors. Therefore, there is an urgent need for a shield tail sealing grease performance failure risk evaluation method based on the influence of multiple environmental factors.

[0063] The shield tail sealing grease performance failure risk evaluation method provided in the embodiment is based on multiple factors, as shown in Figure 1 The method specifically includes the following steps:

[0064] Step S100, identify performance failure influencing factors of the tail-seal grease, wherein the performance failure influencing factors of the tail-seal grease include environmental factors, material factors, and exogenous medium mixing factors.

[0065] In the embodiment, the tail-seal grease is a functional consumable in the process of shield construction, mainly used to fill the gap between the tail of the shield and the segment, form a sealing barrier, and block the intrusion of external media such as groundwater, silt, and slurry in the construction environment into the inside of the tunnel. The performance stability of the tail-seal grease is directly related to the safety and efficiency of the shield construction. The performance failure influencing factors of the tail-seal grease refer to various key variables that may cause the core performance of the tail-seal grease, such as sealing, adhesion, and shear resistance, to decline, and thus lose the expected sealing effect during the whole cycle of shield construction. In the embodiment, the factors are divided into three categories: environmental factors, material factors, and exogenous medium mixing factors. The three factors act on the tail-seal grease from different dimensions and jointly affect the performance failure risk. The environmental factors refer to the characteristic parameters of the external objective environment in which the tail-seal grease works. These parameters change with the construction scene (such as seabed and different strata underground) and directly act on the grease and affect its performance stability. The material factors refer to the attribute characteristics related to the inherent composition of the tail-seal grease, which are brought in during the production and manufacturing stage or generated due to environmental effects during the working process. Such factors determine the basic performance level of the grease itself. The exogenous medium mixing factors refer to the type of variables that change the original composition and structure of the tail-seal grease and thus affect its performance, as external non-grease substances enter the inside of the tail-seal grease during shield tunneling.

[0066] In an implementation manner, the identifying of the performance failure influencing factors of the tail-seal grease specifically includes the following steps.

[0067] Step S110, collect the environmental factors, wherein the environmental factors include soaking time, sea salt concentration, working environment temperature, and working environment water pressure. The soaking time is the time for which the tail-seal grease is soaked in water in a large area. The sea salt concentration is the concentration of sea salt in the seawater in which the tail-seal grease is soaked. The working environment temperature is the average temperature in the working environment of the tail-seal grease. The working environment water pressure is the average water pressure in the working environment of the tail-seal grease.

[0068] Step S120, detect the material factors, wherein the material factors include harmful substance content. The harmful substance content is the content of harmful substances brought in or generated in the manufacturing and working process of the tail-seal grease.

[0069] In step S130, the exogenous medium mixing factor is detected, wherein the exogenous medium mixing factor includes a silt content and a mud content. The silt content is a mass ratio of silt mixed into the shield tail sealing grease during work, and the mud content is a mass ratio of mud mixed into the shield tail sealing grease during work.

[0070] In this embodiment, the environmental factor is specifically real-time or equivalent characteristic data of an external environment in which the shield tail sealing grease is located. The soaking time corresponds to the continuous contact time of the grease in a water environment such as groundwater or seawater. The sea salt concentration is for salt-containing construction scenes such as seabed and coastal areas. The working environment temperature and water pressure match the construction environment parameters of different depths and different geological regions. The collection process needs to be combined with the environmental monitoring equipment of the shield tunneling machine, such as temperature sensors and pressure sensors, or on-site sampling analysis, to ensure that the data is consistent with the actual working conditions.

[0071] The detection of the material factor is specifically the safety and stability of the composition of the grease. The detection of harmful substance content needs to follow the industry's general chemical analysis standard, such as the RoHS (Restriction of Hazardous Substances) related detection method, covering heavy metals, flame retardants and other substances that may be brought into the grease during production, as well as harmful derivatives generated during work due to high temperature, oxidation, etc. The detection results are used to judge the environmental performance and long-term use safety of the grease, and are the key basis for judging whether the grease meets the basic use requirements.

[0072] The detection of the exogenous medium mixing factor is specifically for the problem of external impurities invading the grease during shield tunneling. The detection of the silt content and the mud content needs to sample the grease in use on site and use physical methods such as filtration and weighing to calculate the impurity ratio. Such impurities can directly damage the colloidal structure of the grease and reduce its adhesion, shear strength and other core sealing performance. Therefore, through the detection data, the actual degree of impurity mixing is accurately reflected, providing analysis data for subsequent performance scoring and risk assessment.

[0073] In step S200, based on a preset scoring standard, the performance failure influence factors of the shield tail sealing grease are quantified to obtain a first performance index score set of the shield tail sealing grease.

[0074] In this embodiment, the identified performance failure influence factors of the shield tail sealing grease are converted into quantifiable first performance index scores through the preset scoring standard. The performance indexes in the set do not need to be obtained through actual experimental tests. Only based on the corresponding relationship between the factor data and the preset standard, the scores can be determined, greatly improving the efficiency and convenience of index quantification.

[0075] The preset scoring standard is formulated in combination with shield engineering practical experience, industry performance evaluation specifications and a large amount of historical data. For performance indexes that do not need to be obtained through actual experiment testing, the association rules of each index and influencing factors are respectively established, and each factor value interval or standard reaching state corresponds to a unique scoring result, so that the quantification process is objective and consistent.

[0076] Specifically, the environmental factors, material factors and detection of exogenous medium mixing factors data are matched to the scoring standard of the corresponding performance index one by one, and the scores of each index are directly generated, and then the first performance index score set is formed. In the scoring process, no experimental device needs to be built or field test needs to be carried out, and the data matching and rule calculation can be completed, which reduces the quantification cost and provides basic data support for subsequent comprehensive performance scoring.

[0077] In an implementation manner, the first performance index score set includes adhesion score, shear strength score, pumping performance score and environmental protection performance score, the performance failure influencing factors of the shield tail sealing grease are quantified based on the preset scoring standard, and the first performance index score set of the shield tail sealing grease is obtained, and the specific steps include the following steps:

[0078] In step S210, the adhesion score is determined by using a preset scoring standard table based on the soaking time, the sea salt concentration, the working environment temperature, the silt content and the mud content.

[0079] In step S220, the shear strength score is determined by using a preset scoring standard table based on the sea salt concentration, the working environment temperature and the mud content.

[0080] In step S230, the pumping performance score is determined by using a preset scoring standard table based on the sea salt concentration, the working environment temperature, the silt content and the mud content.

[0081] In step S240, the environmental protection performance score is determined by using a preset scoring standard table based on the harmful substance content.

[0082] In the embodiment, the adhesion failure risk evaluation indexes of the shield tail sealing grease are mainly related to the soaking time, the sea salt concentration, the silt content, the mud content and the working environment temperature, and the values are determined according to Table 1. The weight ratio in the table is the preferred weight ratio corresponding to all risk evaluation indexes, and the weight ratio can be flexibly adjusted based on actual application scenarios.

[0083] Table 1

[0084]

[0085] The shear strength failure risk evaluation index of the shield tail sealing grease is mainly related to sea salt concentration, mud content and temperature, and is specifically valued according to Table 2.

[0086] Table 2

[0087]

[0088] The pumping failure risk evaluation index of the shield tail sealing grease is mainly related to sea salt concentration, sand content, mud content and temperature, and is specifically valued according to Table 3.

[0089] Table 3

[0090]

[0091] The environmental performance failure risk evaluation index of the shield tail sealing grease is mainly related to harmful substance content, and is specifically valued according to Table 4.

[0092] Table 4

[0093]

[0094] Among them, the 10 specific discrimination standards of RoHS standard heavy metal content exceeding the standard include:

[0095] Lead (Pb): ≤0.1%;

[0096] Mercury (Hg): ≤0.1%;

[0097] Cadmium (Cd): ≤0.01%;

[0098] Hexavalent chromium (Cr VI): ≤0.1%;

[0099] Polybrominated biphenyl (PBB): ≤0.1%;

[0100] Polybrominated diphenyl ether (PBDE): ≤0.1%;

[0101] 4 phthalate esters: DBP, BBP, DEHP, DIBP each ≤0.1%.

[0102] Step S300, based on the environmental factors, a simulation environment is constructed, and performance testing is performed on the shield tail sealing grease in the simulation environment to obtain a second performance index score set of the shield tail sealing grease.

[0103] In this embodiment, by carrying out experimental testing, performance data of the shield tail sealing grease in an actual working scene is obtained, and finally a second performance index score set is formed, and the performance indexes in the set need to be obtained through actual testing, and cannot be obtained only by relying on data matching or theoretical calculation, so as to ensure that the index scores can truly reflect the performance of the grease in a complex environment.

[0104] In an implementation manner, the second performance index score set comprises a corrosion resistance score, and the simulated environment is constructed based on the environmental factors, and the performance test of the tail-seal grease is performed in the simulated environment to obtain the second performance index score set of the tail-seal grease, and the performance test comprises the following steps:

[0105] In step S310, a sample of the tail-seal grease is obtained.

[0106] In step S320, a simulated seawater environment corresponding to the working environment of the tail-seal grease is constructed based on the environmental factors.

[0107] In step S330, the sample of the tail-seal grease is soaked in the simulated seawater environment, and after soaking for a preset time, the sample is taken out and dried.

[0108] In step S340, the percentage of the mass loss of the sample before and after soaking is calculated, and the corrosion resistance score is determined by using a preset scoring standard table.

[0109] In this embodiment, the corrosion resistance score in the second performance index score set is obtained through a simulation experiment. The simulation experiment strictly conforms to the seawater contact scene of the tail-seal grease in actual shield construction, and ensures that the test result can truly reflect the performance stability of the grease in the seawater-containing environment.

[0110] Specifically, a sample is extracted from a batch of tail-seal greases used in actual construction, and the sampling amount needs to meet the experimental requirements of subsequent soaking, drying and weighing, so as to avoid test errors caused by insufficient sample amount or poor representativeness. According to the collected seawater salt concentration data, the seawater solution is accurately configured to ensure that the salinity of the simulated seawater is completely consistent with the salinity of the seawater in the actual working environment of the grease. At the same time, if the working environment temperature has an influence on the characteristics of seawater, the temperature of the simulated seawater environment also needs to be controlled within the range of the collected working environment temperature values, so as to reproduce the seawater environment characteristics under the actual working conditions and avoid the influence of environmental parameter deviation on the corrosion resistance test result. The soaking time needs to match the soaking time collected, that is, the time during which the grease is actually immersed in water in the actual working environment, so as to ensure that the sample experiences seawater erosion equivalent to the actual working conditions. However, since the soaking time in the actual environment may be relatively long, the actual soaking scene can be simulated by soaking for 2 hours to obtain a close soaking effect. After soaking, an industry general drying method, such as low-temperature drying, can be selected to dry the sample to a constant weight. Finally, the mass before soaking and the mass after drying of the sample are obtained by weighing, and the percentage of mass loss is calculated according to the following formula:

[0111] (Pre-soaking mass - post-drying mass) / pre-soaking mass x 100%

[0112] After that, the percentage is matched with Table 5 to determine the final corrosion resistance score, ensuring that the score result is quantified and meets the actual performance evaluation needs.

[0113] Table 5

[0114]

[0115] In an implementation manner, the second performance index score set includes a corrosion resistance score, the simulated environment is constructed based on the environmental factors, the performance test is performed on the shield tail sealing grease in the simulated environment, and the second performance index score set of the shield tail sealing grease is obtained, and the method specifically further includes the following steps.

[0116] Step S350, a sample of the shield tail sealing grease is obtained;

[0117] Step S360, the sample is uniformly applied and tamped on the bottom metal mesh of the sealing barrel at a preset thickness;

[0118] Step S370, a preset volume of water is filled above the sample applied in the sealing barrel;

[0119] Step S380, the sealing barrel is sealed, and the sealing barrel is pressurized through the air inlet pipe of the sealing barrel, so that the water pressure in the sealing barrel is the same as the water pressure of the working environment;

[0120] Step S390, the water pressure in the sealing barrel is maintained for a preset time, the leakage condition and leakage time are recorded, and the water sealing resistance score is determined using a preset scoring standard table.

[0121] In this embodiment, the water sealing resistance in the second performance index score set is tested and scored. Specifically, first, a representative sample is extracted from the actual construction grease batch, and the sample is uniformly applied and tamped on the bottom metal mesh of the sealing barrel at a preset thickness. The thickness of the applied grease is generally 50 mm, and the grease layer structure needs to be tamped after application to ensure that the grease layer structure is dense and the sealing test result is not affected by the interlayer gap. In addition, the metal mesh at the bottom of the sealing barrel needs to use three layers of 20-mesh stainless steel mesh to simulate the gap structure between the shield tail and the segment of the shield tunneling machine, and to reproduce the influence of the actual gap on the grease bearing and sealing effect. Then, a preset volume of water is filled above the sample, and the water volume can be controlled in combination with the subsequent pressurization requirement. Generally, about two-thirds of the water volume of the sealing barrel is used in the experiment, which can ensure that the water can uniformly act on the grease layer during subsequent pressurization, and avoid water overflow during pressurization due to excessive water volume, and ensure the sealing property of the test system.

[0122] After the sealing barrel is sealed, high-pressure nitrogen is introduced into the air inlet pipe of the sealing barrel, and the pressure is slowly adjusted with the help of a pressure reducing valve until the water pressure in the sealing barrel is completely consistent with the actual working environment water pressure collected, and the water pressure condition of the grease in the actual shield construction is reproduced. On this basis, the test time of 30 minutes in the conventional test is preserved. During the pressure preservation period, it is continuously observed whether there is water leakage phenomenon at the leakage hole at the bottom of the sealing barrel, and if there is water leakage, the time of the first leakage is accurately recorded, and the water resistance score is determined in combination with Table 6.

[0123] Table 6

[0124]

[0125] Step S400, integrating the first performance index score set and the second performance index score set of the shield tail sealing grease to obtain a comprehensive performance score.

[0126] In this embodiment, by integrating the first performance index score set and the second performance index score set, the index score based on standard quantification and the index score based on simulation experiment are fused into a unified comprehensive performance score.

[0127] In one implementation manner, the integrating the first performance index score set and the second performance index score set of the shield tail sealing grease to obtain a comprehensive performance score specifically includes the following steps:

[0128] Step S410, selecting at least two performance index scores in the first performance index score set and the second performance index score set of the shield tail sealing grease.

[0129] Step S420, setting weights for the selected performance indexes and normalizing the weights.

[0130] Step S430, integrating the selected performance index scores based on the normalized weights to obtain a comprehensive performance score, and the expression is:

[0131]

[0132] wherein, is the weight of the th selected performance index score in the weight vector, , is the th selected performance index score, is the total number of selected performance index scores, is the risk comprehensive score.

[0133] In this embodiment, when at least two performance index scores are selected, the selected range covers the first performance index score set, i.e., the adhesion, shear strength, pumpability, and environmental performance scores, and the second performance index score set, i.e., the corrosion resistance and water resistance scores. The number of selected indexes is at least two, which can avoid the limitation that a single index score cannot comprehensively reflect the performance of the grease, and at the same time, the selection object can be flexibly adjusted according to the focus of the construction scene. For example, in the seabed shield construction scene, the water resistance, corrosion resistance scores with strong adaptability to seawater environment, and the adhesion score which plays an important role in the sealing effect can be selected to form a selection combination of 3 indexes. For the construction scene in the land soft soil layer, the shear strength, pumpability, and environmental performance scores can be selected to ensure that the selected indexes match the requirements of the actual working conditions.

[0134] After selecting the performance indexes used, the weight setting and normalization need to combine the actual role of the selected indexes in the sealing performance guarantee, and need to combine the actual shield application scene. For the core indexes that directly affect the sealing effect of the shield tail, such as water resistance and adhesion, relatively higher weights can be set. For auxiliary performance indexes, such as environmental performance, relatively lower weights can be set. After the weight allocation is completed, normalization processing is needed to ensure that the sum of the weights of all selected indexes is equal to 1, which meets the normalization requirement. For example, when the water resistance and shear strength are selected as the two indexes, if the initial weights are set as 0.4 and 0.1 respectively, the normalized weights are 0.8 and 0.2 respectively, and the total weight is 1.

[0135] The score of each selected index multiplied by the corresponding normalized weight , and the sum of all products is obtained, and finally the risk comprehensive score is obtained . Taking water resistance (score 25, normalized weight 0.4), adhesion (score 50, normalized weight 0.3), and corrosion resistance (score 25, normalized weight 0.3) as an example, the formula can be obtained . The calculation result reflects the difference in the influence of different indexes on the comprehensive performance of the grease, and at the same time, a unified score is formed through quantitative integration, which provides quantitative data basis for subsequent division of failure risk grade.

[0136] Step S500, based on the preset risk grade division threshold and the comprehensive performance score, the failure risk grade of the shield tail sealing grease is divided.

[0137] In the embodiment, by matching the preset risk level division threshold and the comprehensive performance score, the failure risk of the shield tail sealing grease is graded, and the risk level can directly guide the grease use decision in the shield construction. The preset risk level division threshold is formulated in combination with common accident cases of shield construction, critical data of grease performance failure, and construction safety standards, covers the complete interval from low risk to high risk, and ensures that the threshold setting meets the actual construction safety requirements and can distinguish the risk difference corresponding to different comprehensive scores. For example, the higher the comprehensive performance score, the closer the grease performance to the failure critical state, and the higher the failure risk level, and vice versa.

[0138] Specifically, the comprehensive performance score obtained by integrating the above steps is substituted into the preset threshold interval to determine the failure risk level of the grease. The risk division is completed by interval matching, which ensures the determination efficiency and provides specific basis for the subsequent grease replacement and maintenance frequency adjustment, effectively reducing the engineering safety hidden danger caused by grease failure.

[0139] In an implementation manner, the failure risk level of the shield tail sealing grease is divided based on the preset risk level division threshold and the comprehensive performance score, and specifically includes the following steps:

[0140] Step S510, constructing a division rule of the failure risk level of the shield tail sealing grease, wherein the division rule includes a risk level division threshold, and the risk level is proportional to the failure risk of the shield tail sealing grease performance;

[0141] Step S520, comparing the comprehensive performance score corresponding to the shield tail sealing grease with the risk level division threshold to obtain the risk level of the shield tail sealing grease;

[0142] Step S530, making a risk indication for the shield tail sealing grease based on the risk level of the shield tail sealing grease.

[0143] In the embodiment, when constructing the failure risk level classification rule, the proportional relationship between the risk level classification threshold and the risk level is used. Generally, the risk level can be classified into five levels, including a first risk level, a second risk level, a third risk level, a fourth risk level, and a fifth risk level. The higher the level is, the higher the failure risk of the shield tail sealing grease is. Correspondingly, the comprehensive score classification threshold corresponding to the first risk level ranges from 0 to 20, the comprehensive score classification threshold corresponding to the second risk level ranges from 20 to 40, the comprehensive score classification threshold corresponding to the third risk level ranges from 40 to 60, the comprehensive score classification threshold corresponding to the fourth risk level ranges from 60 to 80, and the comprehensive score classification threshold corresponding to the fifth risk level ranges from 80 to 100. The high risk level represents that the grease has a high probability of sealing failure, water leakage, or shield machine shutdown in a short period of time, and the low risk level represents that the grease has stable performance and can meet the long-term construction demand. The rule setting ensures that there is no threshold overlap or vacancy and covers all possible comprehensive performance score results.

[0144] By comparing the comprehensive performance score of the shield tail sealing grease with the risk level classification threshold, the risk level of the shield tail sealing grease is obtained, and after obtaining the risk level, a risk indication is made based on the risk level. Specifically, the risk indication needs to formulate targeted measures in combination with the actual influence of different risk levels. When the risk level is the first risk level and the second risk level, no prevention and control is needed, that is, when the accident probability level is the first level or the second level, the possibility of shield tail failure is relatively low, and the shield machine can normally tunnel without needing to take corrective measures. When the risk level is the third risk level, the injection amount of the grease is increased, that is, there is a certain amount of leakage in the shield tail, and the sealing pressure and the injection amount of the grease are increased until the leakage is completely blocked. When the risk level is the fourth risk level and the fifth risk level, the shield machine should stop tunneling, replace the high-quality grease, and improve the working environment of the grease, that is, the shield machine should immediately stop tunneling, the shield tail sealing force should be increased, the pumping speed of the shield tail sealing grease should be increased, and the sealing effect should be strengthened. When the sealing still cannot be done, personnel should be immediately organized to quickly evacuate the construction site to avoid accidents. These risk indications are directly related to the construction operation, ensuring that the risk level is not only a determination result, but also can be converted into specific actions to protect the construction safety, effectively linking the risk assessment and the actual construction management.

[0145] In summary, under the technical scheme of the above embodiment, the risk of performance failure of the shield tail sealing grease is scientifically quantified through multi-factor identification, double-path scoring, and weight integration, avoiding the limitation of single evaluation, providing accurate basis for grease operation and maintenance, reducing engineering risk, and ensuring the safe and efficient construction of the shield machine.

[0146] For example, as shown in FIG. 6, the shield tail sealing grease is in the third risk level, and the risk indication is to increase the injection amount of the grease. Figure 2As shown in the figure, the embodiment of the present application provides a shield tail sealing grease performance failure risk assessment system based on multiple factor influences, which comprises: an influence factor identification module 10, a first performance index score set acquisition module 20, a second performance index score set acquisition module 30, a comprehensive performance score integration module 40, and a failure risk grade division module 50.

[0147] Specifically, the influence factor identification module 10 is configured to identify performance failure influence factors of shield tail sealing grease, wherein the performance failure influence factors of the shield tail sealing grease include environmental factors, material factors, and exogenous medium mixing factors; the first performance index score set acquisition module 20 is configured to quantize the performance failure influence factors of the shield tail sealing grease based on preset scoring standards to obtain a first performance index score set of the shield tail sealing grease; the second performance index score set acquisition module 30 is configured to construct a simulated environment based on the environmental factors, and perform performance testing on the shield tail sealing grease to obtain a second performance index score set of the shield tail sealing grease; the comprehensive performance score integration module 40 is configured to integrate the first performance index score set and the second performance index score set of the shield tail sealing grease to obtain a comprehensive performance score; and the failure risk grade division module 50 is configured to divide a failure risk grade of the shield tail sealing grease based on a preset risk grade division threshold and the comprehensive performance score.

[0148] Based on the above embodiment, the present application further provides a terminal device, a principle block diagram of which can be as shown in the figure. Figure 3 The terminal device comprises a processor, a memory, a network interface, a display screen, and a temperature sensor connected through a system bus. The processor of the terminal device is configured to provide computing and control capabilities. The memory of the terminal device comprises a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operating system and the computer program in the non-volatile storage medium to run. The network interface of the terminal device is configured to communicate with external terminals through network connection. The computer program is executed by the processor to implement a shield tail sealing grease performance failure risk assessment method based on multiple factor influences. The display screen of the terminal device can be a liquid crystal display screen or an electronic ink display screen. The temperature sensor of the terminal device is pre-set in the terminal device and is configured to detect the running temperature of the internal device.

[0149] Those skilled in the art can understand that, Figure 3 The principle block diagram shown in the figure is only a block diagram of part of the structure related to the present application scheme, and does not constitute a limitation on the terminal device to which the present application scheme is applied. Specifically, the terminal device can comprise more or fewer components than those shown in the figure, or combine certain components, or have a different component arrangement.

[0150] In one embodiment, a terminal device is provided, comprising a memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by one or more processors, the one or more programs comprising instructions for:

[0151] Identify performance failure influencing factors of the shield tail sealing grease, wherein the performance failure influencing factors of the shield tail sealing grease include environmental factors, material factors, and exogenous medium mixing factors;

[0152] Quantify the performance failure influencing factors of the shield tail sealing grease based on preset scoring criteria to obtain a first performance index score set of the shield tail sealing grease;

[0153] Construct a simulated environment based on the environmental factors, and perform performance testing on the shield tail sealing grease in the simulated environment to obtain a second performance index score set of the shield tail sealing grease;

[0154] Integrate the first performance index score set and the second performance index score set of the shield tail sealing grease to obtain a comprehensive performance score;

[0155] Divide the failure risk level of the shield tail sealing grease based on a preset risk level division threshold and the comprehensive performance score.

[0156] A person of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiments can be completed by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer readable storage medium. When the computer program is executed, it can include the processes of the above-mentioned embodiments. Any reference to memory, storage, database or other medium used in the embodiments provided by the present application can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. As an illustration but not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), Rambus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0157] In summary, the application discloses a shield tail sealing grease performance failure risk assessment method and system based on multiple factors, a terminal device and a medium, relating to the technical field of shield engineering. The method first identifies the performance failure influencing factors of the shield tail sealing grease, wherein the performance failure influencing factors of the shield tail sealing grease include environmental factors, material factors and exogenous medium mixing factors. Then, based on a preset scoring standard, the performance failure influencing factors of the shield tail sealing grease are quantified to obtain a first performance index score set of the shield tail sealing grease, and a simulated environment is constructed based on the environmental factors. The shield tail sealing grease is tested in the simulated environment to obtain a second performance index score set of the shield tail sealing grease. After obtaining the first and second performance index score sets, a comprehensive performance score is obtained by integrating the two sets. Finally, based on a preset risk level division threshold and the comprehensive performance score, the failure risk level of the shield tail sealing grease is divided. The application breaks through the limitations of single factor evaluation by identifying performance failure influencing factors in multiple dimensions, and comprehensively covers key variables affecting grease failure. At the same time, the performance score is obtained by combining standard quantification and simulated environment testing, ensuring that the score is more in line with actual working conditions. Further, by integrating the score and grade division, the precise quantification and clear determination of grease failure risk are realized, providing a scientific basis for the use and maintenance of grease in shield construction, effectively reducing the engineering safety risks caused by grease failure, and improving construction safety and efficiency.

[0158] The technical features of the above embodiments can be combined in any manner. To make the description concise, not all possible combinations of the technical features in the above embodiments are described, but as long as the combinations of the technical features do not exist contradictions, they should be considered as the scope of the present application.

[0159] The above-described embodiments only express several implementation manners of the present application, and the description is specific and detailed, but it should not be understood as a limitation on the scope of the patent of the present application. It should be pointed out that for ordinary skilled persons in the art, some modifications and improvements can be made without departing from the concept of the present application, and these belong to the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A method for assessing the risk of performance failure of a shield tail sealing grease based on the influence of a plurality of factors, characterized by, The method comprises: Identify the performance failure influencing factors of the tail seal grease, wherein the performance failure influencing factors of the tail seal grease include environmental factors, material factors, and exogenous medium mixing factors; Quantify the performance failure influencing factors of the tail seal grease based on preset scoring criteria to obtain a first performance index score set of the tail seal grease; Based on the environmental factors, construct a simulated environment, and perform performance testing on the tail seal grease in the simulated environment to obtain a second performance index score set of the tail seal grease; Integrate the first performance index score set and the second performance index score set of the tail seal grease to obtain a comprehensive performance score; Based on preset risk level division thresholds and the comprehensive performance score, divide the failure risk level of the tail seal grease; The second performance index score set includes corrosion resistance score, and the performance testing of the tail seal grease in the simulated environment based on the environmental factors to obtain the second performance index score set of the tail seal grease comprises: Obtain a sample of the tail seal grease; Based on the environmental factors, construct a simulated seawater environment consistent with the working environment of the tail seal grease; Soak the sample of the tail seal grease in the simulated seawater environment, and after soaking for a preset time, take out the sample and dry it; Calculate the percentage of mass loss of the sample before and after soaking, and determine the corrosion resistance score using a preset scoring criteria table; The second performance index score set includes water resistance score, and the performance testing of the tail seal grease in the simulated environment based on the environmental factors to obtain the second performance index score set of the tail seal grease further comprises: Obtain a sample of the tail seal grease; Uniformly apply the sample to the bottom metal mesh of the sealed barrel with a preset thickness; Fill a preset volume of water above the sample applied in the sealed barrel; Seal the sealed barrel, and pressurize the sealed barrel through the air inlet pipe of the sealed barrel so that the water pressure in the sealed barrel is the same as the working environment water pressure; Maintain the water pressure in the sealed barrel for a preset time, record the leakage and leakage time, and determine the water resistance score using a preset scoring criteria table.

2. The method for assessing the risk of performance failure of the tail-seal grease based on the influence of multiple factors according to claim 1, characterized in that, The identification of the performance failure influencing factors of the tail seal grease comprises: Collect the environmental factors, wherein the environmental factors include soaking time, sea salt concentration, working environment temperature, and working environment water pressure, the soaking time is the time when the tail seal grease is soaked in water in a large area, the sea salt concentration is the concentration of sea salt in the seawater in which the tail seal grease is soaked, the working environment temperature is the average temperature in the working environment of the tail seal grease, and the working environment water pressure is the average water pressure in the working environment of the tail seal grease; Detect the material factors, wherein the material factors include harmful substance content, and the harmful substance content is the content of harmful substances brought in or generated during the manufacturing and working of the tail seal grease; Detecting the exogenous medium mixing factor, wherein the exogenous medium mixing factor includes a silt content and a slurry content, the silt content being a mass ratio of silt mixed into the shield tail sealing grease during work, and the slurry content being a mass ratio of slurry mixed into the shield tail sealing grease during work.

3. The method for assessing the risk of performance failure of the tail-seal grease based on the influence of a plurality of factors according to claim 2, characterized by, The first performance index score set includes adhesion scores, shear strength scores, pumping scores, and environmental performance scores. The performance failure influence factors of the shield tail sealing grease are quantified based on the preset scoring standard to obtain the first performance index score set of the shield tail sealing grease, which includes: The adhesion score is determined based on the soaking time, the sea salt concentration, the working environment temperature, the silt content, and the slurry content using a preset scoring standard table; The shear strength score is determined based on the sea salt concentration, the working environment temperature, and the slurry content using a preset scoring standard table; The pumping score is determined based on the sea salt concentration, the working environment temperature, the silt content, and the slurry content using a preset scoring standard table; The environmental performance score is determined based on the harmful substance content using a preset scoring standard table.

4. The method for assessing the risk of performance failure of the tail-seal grease based on the influence of multiple factors according to claim 1, characterized in that, The first performance index score set and the second performance index score set of the shield tail sealing grease are integrated to obtain a comprehensive performance score, which includes: At least two performance index scores in the first performance index score set and the second performance index score set of the shield tail sealing grease are selected; Weights are set for the selected performance indexes, and the weights are normalized; Based on the normalized weights, the selected performance index scores are integrated to obtain a comprehensive performance score, which is expressed as: wherein, is the weight of the selected performance indicator score in the weight vector, , is the selected performance indicator score, is the total number of selected performance indicator scores, is the risk composite score.​​ 5. The method for assessing the risk of performance failure of the tail-seal grease based on the influence of a plurality of factors according to claim 4, characterized by, Based on the preset risk level division threshold and the comprehensive performance score, the failure risk level of the shield tail sealing grease is divided, which includes: A division rule of the failure risk level of the shield tail sealing grease is constructed, wherein the division rule includes a risk level division threshold, and the risk level is directly proportional to the performance failure risk of the shield tail sealing grease; The comprehensive performance score corresponding to the shield tail sealing grease is compared with the risk level division threshold to obtain the risk level of the shield tail sealing grease; Based on the risk level of the shield tail sealing grease, a risk indication is made for the shield tail sealing grease.

6. A system for assessing the risk of failure of a tail seal grease based on the influence of a plurality of factors, characterized in that The system is applied to implement the steps of the shield tail sealing grease performance failure risk assessment method based on multiple influence factors as claimed in any one of claims 1-5, and the system includes: An influence factor identification module is configured to identify performance failure influence factors of the shield tail sealing grease, wherein the performance failure influence factors of the shield tail sealing grease include environmental factors, material factors, and exogenous medium mixing factors; A first performance index score set acquisition module is configured to quantify the performance failure influence factors of the shield tail sealing grease based on a preset scoring standard to obtain a first performance index score set of the shield tail sealing grease. The second performance index score set obtaining module is configured to construct a simulation environment based on the environmental factors, perform a performance test on the shield tail sealing grease, and obtain a second performance index score set of the shield tail sealing grease. The comprehensive performance score integrating module is configured to integrate the first performance index score set and the second performance index score set of the shield tail sealing grease to obtain a comprehensive performance score. The failure risk grade dividing module is configured to divide a failure risk grade of the shield tail sealing grease based on a preset risk grade dividing threshold and the comprehensive performance score.

7. A terminal device, characterized by comprising: The terminal device comprises a memory, a processor, and a shield tail sealing grease performance failure risk assessment program based on multiple factor influences stored in the memory and executable on the processor. When the processor executes the shield tail sealing grease performance failure risk assessment program based on multiple factor influences, the steps of the shield tail sealing grease performance failure risk assessment method based on multiple factor influences according to any one of claims 1-5 are implemented.

8. A computer-readable storage medium, characterized in that, The computer readable storage medium stores a shield tail sealing grease performance failure risk assessment program based on multiple factor influences. When the shield tail sealing grease performance failure risk assessment program based on multiple factor influences is executed by the processor, the steps of the shield tail sealing grease performance failure risk assessment method based on multiple factor influences according to any one of claims 1-5 are implemented.

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