Asphalt concrete pavement segment joint anti-cracking method and system based on odor removal technology

Abstract

The invention relates to the field of material science, and discloses an asphalt concrete pavement segment joint anti-cracking method and system based on an odor removal technology, and the method comprises the steps: fitting a pavement segment joint model of a segment joint; analyzing a damage area and a fracture area of the pavement segment joint model, and analyzing a material stiffness modulus and a material relaxation modulus of the asphalt concrete; constructing a viscoelastic damage model of the asphalt concrete, calculating the viscoelastic damage coefficient of the asphalt concrete, and analyzing the asphalt viscoelasticity of the asphalt concrete; fitting a crack analysis model of the segment joint, and simulating pavement damage evolution of the segment joint; mixing the chemical additive and the asphalt concrete, and analyzing the viscosity effect of the geotechnical mixed material; and determining the optimal elastic modulus of the geotechnical mixed material, analyzing the anti-cracking effect of the geotechnical mixed material, and executing the anti-cracking scheme of the corresponding section joint of the asphalt concrete pavement. The anti-cracking effect of the asphalt concrete pavement segment joint can be improved.

Description

Technical Field

[0001] The present invention relates to the field of material science, and in particular to an anti-cracking method and system for segment joints of asphalt concrete pavement based on odor-free technology. Background Art

[0002] Asphalt concrete pavement segment joints refer to the connection areas between different asphalt concrete pavement panels. These areas are prone to cracks due to factors such as repeated vehicle loads, temperature changes, and material shrinkage. Anti-cracking of segment joints can significantly improve the durability of asphalt concrete pavements, reduce early damage caused by cracks, and thus extend the service life of the pavement.

[0003] At present, the main method for asphalt concrete pavement crack resistance is to fill and seal cracks regularly to prevent water intrusion and crack expansion. This method requires regular maintenance, has high labor costs, and only treats the symptoms but not the root cause, resulting in low efficiency, making the crack resistance of asphalt concrete pavement segment joints poor. Summary of the invention

[0004] The present invention provides an anti-cracking method and system for asphalt concrete pavement segment joints based on odor-free technology, the main purpose of which is to improve the anti-cracking effect of asphalt concrete pavement segment joints.

[0005] To achieve the above-mentioned purpose, the present invention provides an anti-cracking method for segment joints of asphalt concrete pavement based on odor-free technology, comprising:

[0006] Acquire pavement joint data of a segment joint corresponding to an asphalt concrete pavement, and fit a pavement segment joint model of the segment joint based on the pavement joint data;

[0007] Identify the joint cracks of the pavement segment joint model, determine the crack initiation point coordinates of the joint cracks, analyze the damaged area and the fracture area of ​​the pavement segment joint model based on the crack initiation point coordinates, and analyze the material stiffness modulus and material relaxation modulus of the asphalt concrete corresponding to the asphalt concrete pavement;

[0008] Based on the damaged area, the fractured area, the material stiffness modulus and the material relaxation modulus, a viscoelastic damage model of the asphalt concrete is constructed, a viscoelastic damage coefficient of the asphalt concrete is calculated using the viscoelastic damage model, and according to the viscoelastic damage coefficient, the asphalt viscoelasticity of the asphalt concrete is analyzed;

[0009] Fitting a crack analysis model of the segment joint, analyzing a crack growth factor of the segment joint according to the crack analysis model, and simulating the pavement damage evolution of the segment joint using a preset numerical simulation algorithm based on the crack growth factor;

[0010] According to the preset deodorization technology, a chemical additive of the asphalt concrete is obtained, the chemical additive is mixed with the asphalt concrete to obtain a geomix, and based on the viscoelasticity of the asphalt and the evolution of the pavement damage, the viscosity effect of the geomix is ​​analyzed;

[0011] Based on the viscosity effect, the optimal elastic modulus of the geomix is ​​determined, and based on the optimal elastic modulus, the anti-cracking effect of the geomix is ​​analyzed. Based on the anti-cracking effect, an anti-cracking plan for the corresponding segment joints of the asphalt concrete pavement is implemented.

[0012] Optionally, fitting a pavement segment joint model of the segment joint based on the pavement joint data comprises:

[0013] Preprocessing the pavement joint data to obtain preprocessed joint data;

[0014] Analyzing the purpose of model construction of the segment joint, and determining the model framework of the segment joint based on the purpose of model construction;

[0015] Acquire joint image data, material data and environmental data of the preprocessed joint data;

[0016] Extracting joint image features of the joint image data, and constructing a three-dimensional geometric model of the segment joint according to the joint image features;

[0017] defining model material properties of the model framework according to the material data;

[0018] According to the environmental data, the boundary conditions of the model framework are defined, wherein the boundary conditions include: fixed constraint conditions, load action points and temperature change conditions;

[0019] The model material properties and the boundary conditions are mapped to the three-dimensional geometric model to obtain a pavement segment joint model.

[0020] Optionally, analyzing the damaged area and the fractured area of ​​the pavement segment joint model based on the crack initiation point coordinates includes:

[0021] Based on the crack initiation point coordinates, analyzing crack propagation data of the corresponding joint crack of the pavement segment joint model;

[0022] Analyzing the effective stress of the pavement segment joint model according to the crack growth data;

[0023] determining a material yield stress, a current porosity, and a porosity range for the pavement segment joint model;

[0024] Extracting a lower porosity limit and an upper porosity limit of the porosity range, and analyzing a volume plastic strain rate of the pavement segment joint model;

[0025] The model performance of the initial viscoelastic damage model is tested, and when the model performance meets a preset model performance standard, the initial viscoelastic damage model is used as the viscoelastic damage model of the asphalt concrete.

[0026] Optionally, analyzing the crack extension factor of the segment joint according to the crack analysis model includes:

[0027] Analyze the load types and actual application conditions of the segment joints in actual work;

[0028] extracting a crack propagation algorithm of the crack analysis model to identify the crack tip of the segment joint;

[0029] Calculating the stress intensity coefficient at the crack tip based on the crack propagation algorithm;

[0030] Analyzing the stress state at the crack tip according to the stress intensity coefficient, the load type and the actual application condition;

[0031] Analyzing the segment joint according to the crack analysis model and the stress state to obtain crack extension data;

[0032] Based on the crack growth data, the crack growth factor of the segment joint is analyzed.

[0033] Optionally, the analyzing the viscosity effect of the geomix based on the viscoelasticity of the asphalt and the pavement damage evolution includes:

[0034] Testing the storage modulus and loss modulus of the geomix material, and calculating the complex shear modulus of the geomix material according to the storage modulus and the loss modulus;

[0035] Analyzing the mixed viscoelasticity of the geomix material according to the complex shear modulus;

[0036] Analyzing the viscoelastic gain coefficient of the geomix material according to the asphalt viscoelasticity and the mixed viscoelasticity;

[0037] Based on the pavement damage evolution, simulating the damage evolution of the geomix material to obtain damage simulation data;

[0038] Calculating the mixed damage coefficient of the geomix material according to the damage simulation data;

[0039] The viscosity effect of the geomix is ​​analyzed based on the viscoelastic gain coefficient and the mixed damage coefficient.

[0040] Optionally, determining the optimal elastic modulus of the geomix based on the viscosity effect includes:

[0041] Testing the strain data of the geomix material, and calculating the elastic modulus of the geomix material according to the strain data;

[0042] Analyzing the mutual influence relationship between the elastic modulus and the viscosity effect;

[0043] According to the mutual influence relationship, the elastic modulus and the viscosity effect are proportioned to obtain a multi-mixed sample;

[0044] detecting multi-sample performance of the multiple mixed samples, and screening out the best mixed sample of the multiple mixed samples based on the multi-sample performance;

[0045] The optimal elastic modulus of the geomix is ​​determined based on the optimal mixed sample.

[0046] In order to solve the above problems, the present invention also provides an anti-cracking system for segment joints of asphalt concrete pavement based on odor-free technology, the system comprising:

[0047] A segment joint model module is used to obtain pavement joint data of a segment joint corresponding to an asphalt concrete pavement, and fit a pavement segment joint model of the segment joint based on the pavement joint data;

[0048] A modulus parameter calculation module, used to identify the joint cracks of the pavement segment joint model, determine the crack initiation point coordinates of the joint cracks, analyze the damaged area and the fracture area of ​​the pavement segment joint model based on the crack initiation point coordinates, and analyze the material stiffness modulus and material relaxation modulus of the asphalt concrete corresponding to the asphalt concrete pavement;

[0049] an asphalt viscoelastic analysis module, for constructing a viscoelastic damage model of the asphalt concrete based on the damaged area, the fracture area, the material stiffness modulus and the material relaxation modulus, calculating the viscoelastic damage coefficient of the asphalt concrete using the viscoelastic damage model, and analyzing the asphalt viscoelasticity of the asphalt concrete according to the viscoelastic damage coefficient;

[0050] a pavement damage evolution module, used for fitting a crack analysis model of the segment joint, analyzing a crack extension factor of the segment joint according to the crack analysis model, and simulating the pavement damage evolution of the segment joint using a preset numerical simulation algorithm based on the crack extension factor;

[0051] A viscosity effect analysis module, for obtaining the chemical additives of the asphalt concrete according to a preset deodorization technology, mixing the chemical additives with the asphalt concrete to obtain a geomix, and analyzing the viscosity effect of the geomix based on the viscoelasticity of the asphalt and the evolution of the pavement damage;

[0052] The segment joint anti-cracking module is used to determine the optimal elastic modulus of the geomix based on the viscosity effect, analyze the anti-cracking effect of the geomix according to the optimal elastic modulus, and execute the anti-cracking plan of the segment joint corresponding to the asphalt concrete pavement based on the anti-cracking effect.

[0053] The embodiment of the present invention can more carefully simulate and analyze the initiation of cracks, the expansion path and the formation of crack networks by fitting the pavement joint model of the segment joint based on the pavement joint data, which is helpful to understand the mechanism and prevention measures of cracks; optionally, the embodiment of the present invention can analyze the stiffness of asphalt concrete and the time-varying stress relaxation characteristics of the material by analyzing the material stiffness modulus and material relaxation modulus of the asphalt concrete corresponding to the asphalt concrete pavement, which is helpful to understand the deformation behavior and durability of the pavement under load; the embodiment of the present invention can more accurately predict the changes in the mechanical properties of asphalt concrete under long-term loads by constructing a viscoelastic damage model of asphalt concrete based on the damaged area, the fracture area, the material stiffness modulus and the material relaxation modulus, and quantify the degree of damage of asphalt concrete during loading, thereby optimizing the material ratio and structural design in the design stage, and improving Durability and reliability of asphalt concrete structure; the embodiment of the present invention can predict the expansion path, speed and final form of cracks under different loads and environmental conditions by analyzing the crack expansion factor of the segment joint according to the crack analysis model, thereby optimizing the geometric design, material selection and construction process of the segment joint to reduce the probability of crack occurrence or control the expansion of cracks; the embodiment of the present invention can significantly reduce the irritating odor generated by asphalt concrete during mixing, construction and use by obtaining the chemical additives of the asphalt concrete according to the preset deodorization technology, while enhancing the bonding force between asphalt and aggregate, and improving the overall strength and stability of asphalt concrete. Finally, the embodiment of the present invention can optimize the design of the material by analyzing the anti-cracking effect of the geomix according to the optimal elastic modulus, so that it has better anti-cracking performance when subjected to external forces, thereby reducing the generation and development of cracks. Therefore, the present invention can improve the anti-cracking effect of segment joints of asphalt concrete pavement. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 A schematic flow chart of an asphalt concrete pavement segment joint anti-cracking method based on odor-free technology provided in one embodiment of the present invention;

[0055] Figure 2 A functional module diagram of an asphalt concrete pavement segment joint anti-cracking system based on odor-free technology provided in one embodiment of the present invention;

[0056] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0057] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0058] The embodiment of the present application provides an anti-cracking method for asphalt concrete pavement segment joints based on the clean odor technology. The execution subject of the anti-cracking method for asphalt concrete pavement segment joints based on the clean odor technology includes but is not limited to at least one of the electronic devices such as the server and the terminal that can be configured to execute the method provided by the embodiment of the present application. In other words, the anti-cracking method for asphalt concrete pavement segment joints based on the clean odor technology can be executed by software or hardware installed on a terminal device or a server device, and the software can be a blockchain platform. The server includes but is not limited to: a single server, a server cluster, a cloud server or a cloud server cluster, etc. The server can be an independent server, or it can be a cloud server that provides cloud services, cloud databases, cloud computing, cloud functions, cloud storage, network services, cloud communications, middleware services, domain name services, security services, content delivery networks (Content Delivery Network, CDN), and basic cloud computing services such as big data and artificial intelligence platforms.

[0059] Reference Figure 1 FIG. 1 is a flow chart of an asphalt concrete pavement segment joint anti-cracking method based on the odor-free technology provided by an embodiment of the present invention. In this embodiment, the asphalt concrete pavement segment joint anti-cracking method based on the odor-free technology includes:

[0060] S1. Obtain pavement joint data of a segment joint corresponding to an asphalt concrete pavement, and fit a pavement segment joint model of the segment joint based on the pavement joint data.

[0061] The embodiment of the present invention can identify the main factors causing cracks by acquiring the pavement joint data of the corresponding segment joints of the asphalt concrete pavement, which is helpful to select more suitable anti-cracking materials. The pavement joint data refers to various measurement and performance data related to the segment joints of the asphalt concrete pavement.

[0062] The embodiment of the present invention can simulate and analyze the initiation, expansion path and formation of crack network of cracks more carefully by fitting the pavement segment joint model of the segment joint based on the pavement joint data, which is helpful to understand the mechanism and prevention measures of cracks. Among them, the pavement segment joint model refers to a model that can simulate and visualize the structure and mechanical behavior of asphalt concrete pavement segment joints in three-dimensional space.

[0063] As an embodiment of the present invention, the step of fitting a pavement segment joint model of the segment joint based on the pavement joint data includes:

[0064] Preprocessing the pavement joint data to obtain preprocessed joint data;

[0065] Analyzing the purpose of model construction of the segment joint, and determining the model framework of the segment joint based on the purpose of model construction;

[0066] Acquire joint image data, material data and environmental data of the preprocessed joint data;

[0067] Extracting joint image features of the joint image data, and constructing a three-dimensional geometric model of the segment joint according to the joint image features;

[0068] defining model material properties of the model framework according to the material data;

[0069] According to the environmental data, the boundary conditions of the model framework are defined, wherein the boundary conditions include: fixed constraint conditions, load action points and temperature change conditions;

[0070] The model material properties and the boundary conditions are mapped to the three-dimensional geometric model to obtain a pavement segment joint model.

[0071] Among them, the pre-processed joint data refers to the data after a series of processing of the pavement joint data. The model construction purpose refers to the specific goals and intentions set when creating the pavement segment joint model, such as performance evaluation, design optimization and other purposes. The model framework refers to the basic structure or system used when building the model, which defines the type, components, relationships between the models, and how to process data and perform calculations. The joint image data refers to the visual information about the pavement segment joint obtained by image acquisition technology. The material data refers to the material property information related to the asphalt concrete pavement segment joint. The environmental data refers to the external condition data that affects the performance of the asphalt concrete pavement segment joint. The joint image feature refers to the quantitative or qualitative information extracted from the joint image data for describing and characterizing the characteristics of the pavement segment joint. The three-dimensional geometric model refers to a mathematical model that accurately represents the shape and size of an object in three-dimensional space. The model material properties refer to the characteristic parameters used to describe and define the material behavior in the model. The boundary conditions refer to the rules and restrictions used to define the interaction between the model system and the external environment. The fixed constraint refers to the restriction imposed on a part of the model in a numerical simulation or physical model to prevent its displacement or movement in a specific direction. The load action point refers to the specific location where the load is applied in the structural analysis. The temperature change condition refers to the temperature fluctuation and gradient considered in the pavement segment joint model.

[0072] Optionally, the joint image features of the joint image data may be extracted by image processing techniques, such as Canny edge detection, morphological operations, and the like.

[0073] S2. Identify the joint cracks of the pavement segment joint model, determine the crack initiation point coordinates of the joint cracks, analyze the damaged area and fracture area of ​​the pavement segment joint model based on the crack initiation point coordinates, and analyze the material stiffness modulus and material relaxation modulus of the asphalt concrete corresponding to the asphalt concrete pavement.

[0074] The embodiment of the present invention can analyze the material properties of asphalt concrete by identifying the joint cracks of the pavement segment joint model, thereby guiding the selection and application of materials. The joint cracks refer to cracks or fractures that appear at the joints of the asphalt concrete pavement segments.

[0075] The embodiment of the present invention can more accurately diagnose the health status of the pavement structure by determining the crack initiation point coordinates of the joint crack and accurately locating the crack initiation point. The crack initiation point coordinates refer to the specific spatial position point at the starting position of the crack in the pavement segment joint.

[0076] Optionally, as an embodiment of the present invention, the coordinates of the crack initiation point of the joint crack may be determined by a computer vision algorithm.

[0077] The embodiment of the present invention can analyze the damage degree of the joint area and predict the propagation path and speed of the crack by analyzing the damage area and the fracture area of ​​the pavement segment joint model based on the crack initiation point coordinates. The damage area refers to various damage information related to the pavement segment joint model. The fracture area refers to information related to the fracture of the pavement segment joint model.

[0078] As an embodiment of the present invention, the analyzing the damaged area and the fractured area of ​​the pavement segment joint model based on the crack initiation point coordinates includes:

[0079] Based on the crack initiation point coordinates, analyzing crack propagation data of the corresponding joint crack of the pavement segment joint model;

[0080] Analyzing the effective stress of the pavement segment joint model according to the crack growth data;

[0081] determining a material yield stress, a current porosity, and a porosity range for the pavement segment joint model;

[0082] Extracting a lower porosity limit and an upper porosity limit of the porosity range, and analyzing a volume plastic strain rate of the pavement segment joint model;

[0083] According to the effective stress, the material yield stress, the current porosity, the porosity lower limit, the porosity upper limit and the volume plastic strain rate, the damage variable of the pavement segment joint model is calculated using the following formula:

[0084]

[0085] Where S represents the damage variable, Y b represents effective stress, Y q represents the material yield stress, k represents the current porosity, k min represents the lower limit of porosity, k max represents the upper limit of porosity, β represents the volume plastic strain rate;

[0086] According to the damage variables, damaged areas and fractured areas of the pavement segment joint model are identified.

[0087] Among them, the crack extension data refers to the quantitative information related to the extension and growth of cracks in the pavement segment joint model. The crack extension data refers to the quantitative information related to the extension and growth of cracks in the pavement segment joint model. The effective stress refers to the stress that actually bears the external load after considering the influence of internal defects in the material. The material yield stress refers to the critical stress value at which asphalt concrete begins to undergo plastic deformation when subjected to external loads. The current porosity refers to the percentage of pore volume to total volume of the material under a certain state. The porosity range refers to the possible variation range of the material porosity under certain conditions. The lower limit of the porosity refers to the minimum value of the porosity range. The upper limit of the porosity refers to the maximum value of the porosity range. The volume plastic strain rate refers to the change in volume plastic strain per unit time during the plastic deformation process of the material. The damage variable refers to a dimensionless parameter used to quantify the degree of internal damage to a material or structure.

[0088] Optionally, the material yield stress, current porosity and porosity range of the pavement segment joint model may be determined by multi-scale simulation.

[0089] The embodiment of the present invention can analyze the stiffness of asphalt concrete and the stress relaxation characteristics of the material over time by analyzing the material stiffness modulus and material relaxation modulus of the asphalt concrete corresponding to the asphalt concrete pavement, which is helpful to understand the deformation behavior and durability of the pavement under load. Among them, the material stiffness modulus refers to the ability of the material to resist deformation when subjected to external force. The material relaxation modulus refers to a quantitative indicator of the phenomenon that the strain of the material gradually increases over time under constant stress.

[0090] As an embodiment of the present invention, the analyzing the material stiffness modulus and material relaxation modulus of the asphalt concrete corresponding to the asphalt concrete pavement includes:

[0091] constructing an asphalt concrete specimen of the asphalt concrete, and measuring a support span, a specimen height, and a specimen width of the asphalt concrete specimen;

[0092] Performing a static loading test on the asphalt concrete specimen to obtain a static applied load and a static displacement;

[0093] The material stiffness modulus of the asphalt concrete specimen is calculated using the following formula according to the support span, the specimen height, the specimen width, the static applied load, and the static displacement:

[0094]

[0095] Where J represents the material stiffness modulus, H arepresents the static applied load, D represents the support span, w represents the specimen width, g represents the specimen height, ρ a represents static displacement;

[0096] Performing a dynamic shear rheometer test on the asphalt concrete specimen to obtain shear stress and specimen strain;

[0097] According to the shear stress and the specimen strain, the material relaxation modulus of the asphalt concrete specimen is calculated using the following formula:

[0098]

[0099] Wherein, C(t) represents the relaxation modulus of the material at time t, Q(t) represents the shear stress at time t, and B(t) represents the specimen strain at time t.

[0100] Among them, the asphalt concrete specimen refers to a standard specimen made according to specific size and shape requirements, which is used to perform various performance tests on asphalt concrete materials under laboratory conditions. The support span refers to the distance between two adjacent support points in structural engineering or material testing. The specimen height refers to the dimension of the asphalt concrete specimen in the vertical direction. The specimen width refers to the dimension of the asphalt concrete specimen in the horizontal direction. The static applied load refers to the force gradually applied to the specimen at a constant rate or in an unchanged manner. The static displacement refers to the displacement of a structure or material specimen under the action of a static load. The shear stress refers to the stress of the force acting on the surface of an object in a direction perpendicular to the action surface. The specimen strain refers to the proportion of the relative change in length or shape of the specimen when it is subjected to an external force. It is a dimensionless quantity that measures the degree of deformation of the material.

[0101] S3. Based on the damaged area, the fracture area, the material stiffness modulus and the material relaxation modulus, a viscoelastic damage model of the asphalt concrete is constructed, the viscoelastic damage coefficient of the asphalt concrete is calculated using the viscoelastic damage model, and the asphalt viscoelasticity of the asphalt concrete is analyzed based on the viscoelastic damage coefficient.

[0102] The embodiment of the present invention constructs the viscoelastic damage model of the asphalt concrete based on the damage zone, the fracture zone, the material stiffness modulus and the material relaxation modulus, which can more accurately predict the change of mechanical properties of asphalt concrete under long-term load, quantify the degree of damage of asphalt concrete during loading, thereby optimizing material ratio and structural design in the design stage, and improving the durability and reliability of asphalt concrete structure. Among them, the viscoelastic damage model refers to a mathematical and physical model used to describe and predict the mechanical behavior of viscoelastic materials such as asphalt concrete when subjected to external loads.

[0103] As an embodiment of the present invention, the viscoelastic damage model of the asphalt concrete is constructed based on the damaged area, the fractured area, the material stiffness modulus and the material relaxation modulus, including:

[0104] Based on the damaged area and the fractured area, the material behavior state of the asphalt concrete is analyzed, and the damage evolution equation of the asphalt concrete is defined.

[0105] Determining the model type of the asphalt concrete according to the material behavior state;

[0106] According to the damage evolution equation and the model type, constructing the model framework of the asphalt concrete;

[0107] The material stiffness modulus and the material relaxation modulus are mapped into the model framework to obtain an initial viscoelastic damage model, wherein the initial viscoelastic damage model includes:

[0108]

[0109] Among them, γ b (T) represents the stress at time T, S(T) represents the damage variable at time T, J(T) represents the material stiffness modulus at time T, μ(T) represents the strain at time T, C(θ) represents the material relaxation modulus, represents the strain rate at time T, and dθ represents the integral over time;

[0110] The model performance of the initial viscoelastic damage model is tested, and when the model performance meets a preset model performance standard, the initial viscoelastic damage model is used as the viscoelastic damage model of the asphalt concrete.

[0111] Among them, the material behavior state refers to the comprehensive performance of the internal structure and performance of asphalt concrete changing with time when it is subjected to external loads. The damage evolution equation refers to a mathematical expression that describes the change law of the degree of damage of the material during the stress process with time or loading history. The model type refers to the form of the specific mathematical and physical model selected when constructing the viscoelastic damage model of asphalt concrete. The model framework refers to the basic structure and components used when constructing the viscoelastic damage model of asphalt concrete. The initial viscoelastic damage model refers to the first basic model established when performing viscoelastic damage analysis on asphalt concrete materials. The model performance refers to the performance and ability of the viscoelastic damage model in simulating and predicting the behavior of asphalt concrete materials. The preset model performance standard refers to a series of criteria that are pre-set to measure the quality of the model based on the expected application objectives and actual needs of the model.

[0112] Optionally, the model framework of the asphalt concrete can be constructed by a continuum mechanics method based on the damage evolution equation and the model type.

[0113] The embodiment of the present invention can quantitatively analyze the degree of damage of asphalt concrete under load by calculating the viscoelastic damage coefficient of the asphalt concrete using the viscoelastic damage model, thereby optimizing the formulation and construction process of asphalt concrete to improve its ability to resist damage. The viscoelastic damage coefficient refers to a parameter used to quantify the degree of damage caused by viscoelastic deformation of a material during cyclic loading or long-term loading.

[0114] As an embodiment of the present invention, the viscoelastic damage coefficient of the asphalt concrete is calculated by using the viscoelastic damage model, including:

[0115] According to the viscoelastic damage model, constructing a model stress-strain curve of the stress and strain corresponding to the viscoelastic damage model;

[0116] Defining the initial non-destructive stress-strain curve of the asphalt concrete, and obtaining the current strain and initial elastic modulus of the asphalt concrete;

[0117] According to the model stress-strain curve, mapping the model stress of the current strain, according to the initial lossless stress-strain curve, mapping the lossless stress of the current strain;

[0118] According to the lossless stress, the model stress and the current strain, the viscoelastic damage coefficient of the asphalt concrete is calculated using the following formula:

[0119]

[0120] Among them, α represents the viscoelastic damage coefficient, γ b (τ) represents the model stress of the current strain, M0 represents the initial elastic modulus, μ d represents the current strain, γ init (τ) represents the nondestructive stress at the current strain, and dτ represents a small strain increment.

[0121] Among them, the model stress-strain curve refers to a curve constructed by a viscoelastic damage model, which is used to describe the relationship between stress and strain of asphalt concrete during stress. The initial lossless stress-strain curve refers to a curve that describes the relationship between stress and strain of the material at the initial stage of stress when the material has not yet been damaged or destroyed. The current strain refers to the total strain experienced by the asphalt concrete material at a certain moment or loading stage under certain loading conditions. The initial elastic modulus refers to the ratio of stress to strain at the initial stage of stress, that is, in the elastic deformation stage (before reaching the yield point or failure point). The model stress refers to the internal force distribution state of a material or structure calculated or predicted based on a specific theory or hypothesis when it is subjected to an external force. The lossless stress refers to the stress borne inside the material when the material has not been damaged or destroyed.

[0122] Optionally, the model stress-strain curve of the stress and strain corresponding to the viscoelastic damage model constructed according to the viscoelastic damage model can be constructed by finite element analysis.

[0123] The embodiment of the present invention can help optimize the formulation of asphalt concrete and improve its damage resistance and long-term stability by analyzing the asphalt viscoelasticity of the asphalt concrete according to the viscoelastic damage coefficient. The asphalt viscoelasticity refers to the mechanical properties of asphalt materials that are both viscous and elastic when subjected to external forces.

[0124] Optionally, as an embodiment of the present invention, the analysis of the asphalt viscoelasticity of the asphalt concrete based on the viscoelastic damage coefficient may be performed by a method for analyzing the synergistic effect of composite materials.

[0125] S4. Fitting a crack analysis model of the segment joint, analyzing the crack extension factor of the segment joint according to the crack analysis model, and simulating the pavement damage evolution of the segment joint based on the crack extension factor using a preset numerical simulation algorithm.

[0126] The embodiment of the present invention can predict the crack development of the segment joint under different load and environmental conditions by fitting the crack analysis model of the segment joint. The crack analysis model refers to a mathematical and mechanical model for predicting and evaluating crack behavior in a structure.

[0127] Optionally, as an embodiment of the present invention, the crack analysis model fitting the segment joint may be fitted by a data assimilation technique.

[0128] The embodiment of the present invention can predict the crack expansion path, speed and final form under different load and environmental conditions by analyzing the crack expansion factor of the segment joint according to the crack analysis model, thereby optimizing the geometric design, material selection and construction process of the segment joint to reduce the probability of crack occurrence or control the expansion of the crack. The crack expansion factor is a parameter used to describe the crack expansion rate and mode of a material under stress.

[0129] As an embodiment of the present invention, analyzing the crack extension factor of the segment joint according to the crack analysis model includes:

[0130] Analyze the load types and actual application conditions of the segment joints in actual work;

[0131] extracting a crack propagation algorithm of the crack analysis model to identify the crack tip of the segment joint;

[0132] Calculating the stress intensity coefficient at the crack tip based on the crack propagation algorithm;

[0133] Analyzing the stress state at the crack tip according to the stress intensity coefficient, the load type and the actual application condition;

[0134] Analyzing the segment joint according to the crack analysis model and the stress state to obtain crack extension data;

[0135] Based on the crack growth data, the crack growth factor of the segment joint is analyzed.

[0136] Among them, the load type refers to the types of various forces acting on the segment joints, which may come from different sources and mechanisms of action. The actual applied conditions refer to various internal conditions and external effects applied according to actual conditions. The crack propagation algorithm refers to a set of calculation rules and procedures used to simulate and predict the growth of cracks in structures over time or under load. The crack tip refers to the end of the crack, that is, the front end of the crack. The stress intensity coefficient refers to a dimensionless parameter used in fracture mechanics to describe the stress state at the crack tip. The stress state refers to the stress distribution at various points inside a material or structure when it is subjected to external forces. The crack propagation data refers to information obtained through numerical simulation about the growth of cracks in materials or structures over time or under load.

[0137] Optionally, the stress intensity coefficient at the crack tip calculated based on the crack extension algorithm may be calculated by a boundary element method.

[0138] Optionally, the crack extension factor of the segment joint analyzed based on the crack extension data may be obtained by a correlation analysis method.

[0139] The embodiment of the present invention can predict the expansion path and speed of the cracks in the segment joints under different loads and environmental conditions by simulating the pavement damage evolution of the segment joints using a preset numerical simulation algorithm based on the crack expansion factor, thereby predicting the development trend of the damage. The preset numerical simulation algorithm refers to a series of calculation methods for simulating and analyzing structural mechanical behavior. The pavement damage evolution refers to a series of processes in which its structural performance and surface condition gradually deteriorate due to the effects of various internal and external factors.

[0140] S5. According to the preset deodorization technology, obtain the chemical additives of the asphalt concrete, mix the chemical additives with the asphalt concrete to obtain a geomix, and analyze the viscosity effect of the geomix based on the viscoelasticity of the asphalt and the evolution of the pavement damage.

[0141] The embodiment of the present invention obtains the chemical additives of the asphalt concrete according to the preset deodorization technology, which can significantly reduce the pungent odor generated by the asphalt concrete during mixing, construction and use, while enhancing the bonding force between asphalt and aggregate, and improving the overall strength and stability of the asphalt concrete. Among them, the preset deodorization technology refers to a series of technical measures aimed at reducing or eliminating the odor and harmful gases generated by building materials (such as asphalt concrete) during production, construction and use. The chemical additive refers to a specific chemical substance added during the production process of asphalt concrete.

[0142] In the embodiment of the present invention, the chemical additive and the asphalt concrete are mixed to obtain a geomix material, which can enhance the bonding force between asphalt and aggregate, improve the overall bonding performance of the mixed material, and thus enhance the water damage resistance and durability of the road surface. The geomix material refers to a composite material formed by mixing one or more geotechnical materials with traditional building materials (such as asphalt, concrete, etc.) according to a certain proportion and process.

[0143] Optionally, as an embodiment of the present invention, the mixing of the chemical additive and the asphalt concrete to obtain a geomix can be obtained by intelligent mixing technology.

[0144] The embodiment of the present invention can help enhance the internal bonding force of asphalt concrete by analyzing the viscous effect of the geomix based on the viscoelasticity of the asphalt and the evolution of the pavement damage, thereby improving the overall durability of the pavement and reducing early damage caused by poor bonding. The viscous effect refers to the bonding ability of the asphalt concrete mixture under physical and chemical effects.

[0145] As an embodiment of the present invention, the analysis of the viscosity effect of the geomix based on the viscoelasticity of the asphalt and the evolution of the road surface damage includes:

[0146] Testing the storage modulus and loss modulus of the geomix material, and calculating the complex shear modulus of the geomix material according to the storage modulus and the loss modulus;

[0147] Analyzing the mixed viscoelasticity of the geomix material according to the complex shear modulus;

[0148] Analyzing the viscoelastic gain coefficient of the geomix material according to the asphalt viscoelasticity and the mixed viscoelasticity;

[0149] Based on the pavement damage evolution, simulating the damage evolution of the geomix material to obtain damage simulation data;

[0150] Calculating the mixed damage coefficient of the geomix material according to the damage simulation data;

[0151] The viscosity effect of the geomix is ​​analyzed based on the viscoelastic gain coefficient and the mixed damage coefficient.

[0152] Among them, the storage modulus refers to a measure of the energy storage capacity of a material when it is subjected to periodic stress or strain. The loss modulus refers to a measure of the ability of a material to lose energy in the form of heat energy when it is subjected to periodic stress or strain. The complex shear modulus refers to a complex parameter that describes the viscoelastic behavior of a material under dynamic or alternating stress. The mixed viscoelasticity refers to the property of a material that exhibits both viscosity and elasticity. The viscoelastic gain coefficient refers to a parameter used to describe the change in the viscoelastic properties of a material. The damage simulation data refers to a series of data used to describe the evolution of internal structural damage of a material when it is subjected to an external load. The mixed damage coefficient refers to a parameter used to quantify the degree of damage to a material under complex stress or loading conditions.

[0153] Optionally, the storage modulus and loss modulus of the geomix material may be measured by a dynamic shear test.

[0154] Optionally, the mixed damage coefficient of the geomix material calculated based on the damage simulation data may be calculated by a finite element analysis method.

[0155] S6. Based on the viscosity effect, determine the optimal elastic modulus of the geomix, analyze the anti-cracking effect of the geomix according to the optimal elastic modulus, and based on the anti-cracking effect, implement the anti-cracking plan for the corresponding segment joints of the asphalt concrete pavement.

[0156] The embodiment of the present invention determines the optimal elastic modulus of the geomix material based on the viscosity effect to ensure that the material maintains stability under long-term load, reduces deformation and fatigue damage, and thus extends the service life of the road. The optimal elastic modulus refers to the most suitable elastic modulus value for the geomix material to achieve its design goals and functions.

[0157] As an embodiment of the present invention, determining the optimal elastic modulus of the geomix based on the viscosity effect includes:

[0158] Testing the strain data of the geomix material, and calculating the elastic modulus of the geomix material according to the strain data;

[0159] Analyzing the mutual influence relationship between the elastic modulus and the viscosity effect;

[0160] According to the mutual influence relationship, the elastic modulus and the viscosity effect are proportioned to obtain a multi-mixed sample;

[0161] detecting multi-sample performance of the multiple mixed samples, and screening out the best mixed sample of the multiple mixed samples based on the multi-sample performance;

[0162] The optimal elastic modulus of the geomix is ​​determined based on the optimal mixed sample.

[0163] Among them, the strain data refers to the ratio of the deformation of the material when it is subjected to external force to the original size in the material mechanics test. The elastic modulus refers to the ratio of stress to strain within the elastic deformation range of the material when it is subjected to external force. The mutual influence relationship refers to the interaction and dependence between different factors, variables or components. The multi-mixed sample refers to a series of different geomixed material samples prepared by changing the component ratio, material type or other variables. The multi-sample performance refers to the results obtained from a series of tests on the multi-mixed samples. The best mixed sample refers to the sample that shows the best performance in a series of multi-mixed samples through performance testing and evaluation.

[0164] Optionally, the strain data of the geomix material may be obtained by a triaxial shear test.

[0165] The embodiment of the present invention can optimize the design of the material by analyzing the anti-crack effect of the geomix material according to the optimal elastic modulus, so that the material has better anti-crack performance when subjected to external forces, thereby reducing the generation and development of cracks. The anti-crack effect refers to the ability of the geomix material to resist the generation of cracks when subjected to external loads, temperature changes, humidity changes or other environmental factors.

[0166] Optionally, as an embodiment of the present invention, the analysis of the anti-cracking effect of the geomix material according to the optimal elastic modulus can be performed through an environmental simulation laboratory.

[0167] The embodiment of the present invention implements the anti-cracking scheme of the segment joints corresponding to the asphalt concrete pavement based on the anti-cracking effect, and can reduce cracks at the segment joints through an effective anti-cracking scheme, thereby improving the integrity and continuity of the pavement structure.

[0168] The embodiment of the present invention can more carefully simulate and analyze the initiation of cracks, the expansion path and the formation of crack networks by fitting the pavement joint model of the segment joint based on the pavement joint data, which is helpful to understand the mechanism and prevention measures of cracks; optionally, the embodiment of the present invention can analyze the stiffness of asphalt concrete and the time-varying stress relaxation characteristics of the material by analyzing the material stiffness modulus and material relaxation modulus of the asphalt concrete corresponding to the asphalt concrete pavement, which is helpful to understand the deformation behavior and durability of the pavement under load; the embodiment of the present invention can more accurately predict the changes in the mechanical properties of asphalt concrete under long-term loads by constructing a viscoelastic damage model of asphalt concrete based on the damaged area, the fracture area, the material stiffness modulus and the material relaxation modulus, and quantify the degree of damage of asphalt concrete during loading, thereby optimizing the material ratio and structural design in the design stage, and improving Durability and reliability of asphalt concrete structure; the embodiment of the present invention can predict the expansion path, speed and final form of cracks under different loads and environmental conditions by analyzing the crack expansion factor of the segment joint according to the crack analysis model, thereby optimizing the geometric design, material selection and construction process of the segment joint to reduce the probability of crack occurrence or control the expansion of cracks; the embodiment of the present invention can significantly reduce the irritating odor generated by asphalt concrete during mixing, construction and use by obtaining the chemical additives of the asphalt concrete according to the preset deodorization technology, while enhancing the bonding force between asphalt and aggregate, and improving the overall strength and stability of asphalt concrete. Finally, the embodiment of the present invention can optimize the design of the material by analyzing the anti-cracking effect of the geomix according to the optimal elastic modulus, so that it has better anti-cracking performance when subjected to external forces, thereby reducing the generation and development of cracks. Therefore, the present invention can improve the anti-cracking effect of segment joints of asphalt concrete pavement.

[0169] like Figure 2 , is a functional module diagram of an asphalt concrete pavement segment joint anti-cracking system based on odor-free technology provided by an embodiment of the present invention.

[0170] The asphalt concrete pavement segment joint anti-cracking system 200 based on the clean odor technology of the present invention can be installed in an electronic device. According to the functions to be implemented, the asphalt concrete pavement segment joint anti-cracking system 200 based on the clean odor technology can include a segment joint model module 201, a modulus parameter calculation module 202, an asphalt viscoelastic analysis module 203, a pavement damage evolution module 204, a viscosity effect analysis module 205 and a segment joint anti-cracking module 206. The module of the present invention can also be called a unit, which refers to a series of computer program segments that can be executed by an electronic device processor and can complete fixed functions, which are stored in the memory of the electronic device.

[0171] In this embodiment, the functions of each module / unit are as follows:

[0172] The segment joint model module 201 is used to obtain pavement joint data of the segment joint corresponding to the asphalt concrete pavement, and fit the pavement segment joint model of the segment joint based on the pavement joint data;

[0173] The modulus parameter calculation module 202 is used to identify the joint cracks of the pavement segment joint model, determine the crack initiation point coordinates of the joint cracks, analyze the damaged area and the fracture area of ​​the pavement segment joint model based on the crack initiation point coordinates, and analyze the material stiffness modulus and material relaxation modulus of the asphalt concrete corresponding to the asphalt concrete pavement;

[0174] The asphalt viscoelastic analysis module 203 is used to construct a viscoelastic damage model of the asphalt concrete based on the damaged area, the fracture area, the material stiffness modulus and the material relaxation modulus, calculate the viscoelastic damage coefficient of the asphalt concrete using the viscoelastic damage model, and analyze the asphalt viscoelasticity of the asphalt concrete according to the viscoelastic damage coefficient;

[0175] The pavement damage evolution module 204 is used to fit the crack analysis model of the segment joint, analyze the crack extension factor of the segment joint according to the crack analysis model, and simulate the pavement damage evolution of the segment joint using a preset numerical simulation algorithm based on the crack extension factor;

[0176] The viscosity effect analysis module 205 is used to obtain the chemical additives of the asphalt concrete according to the preset deodorization technology, mix the chemical additives with the asphalt concrete to obtain a geomix, and analyze the viscosity effect of the geomix based on the viscoelasticity of the asphalt and the evolution of the pavement damage;

[0177] The segment joint anti-cracking module 206 is used to determine the optimal elastic modulus of the geomix based on the viscosity effect, analyze the anti-cracking effect of the geomix according to the optimal elastic modulus, and execute the anti-cracking plan of the segment joint corresponding to the asphalt concrete pavement based on the anti-cracking effect.

[0178] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention.

Claims

1. A method for anti-cracking of segment joints of asphalt concrete pavement based on odor-free technology, characterized in that: The method comprises: Acquire pavement joint data of a segment joint corresponding to an asphalt concrete pavement, and fit a pavement segment joint model of the segment joint based on the pavement joint data; Identify the joint cracks of the pavement segment joint model, determine the crack initiation point coordinates of the joint cracks, analyze the damaged area and the fracture area of ​​the pavement segment joint model based on the crack initiation point coordinates, and analyze the material stiffness modulus and material relaxation modulus of the asphalt concrete corresponding to the asphalt concrete pavement; Based on the damaged area, the fractured area, the material stiffness modulus and the material relaxation modulus, a viscoelastic damage model of the asphalt concrete is constructed, a viscoelastic damage coefficient of the asphalt concrete is calculated using the viscoelastic damage model, and according to the viscoelastic damage coefficient, the asphalt viscoelasticity of the asphalt concrete is analyzed; Fitting a crack analysis model of the segment joint, analyzing a crack growth factor of the segment joint according to the crack analysis model, and simulating the pavement damage evolution of the segment joint using a preset numerical simulation algorithm based on the crack growth factor; According to the preset deodorization technology, a chemical additive of the asphalt concrete is obtained, the chemical additive is mixed with the asphalt concrete to obtain a geomix, and based on the viscoelasticity of the asphalt and the evolution of the pavement damage, the viscosity effect of the geomix is ​​analyzed; Based on the viscosity effect, the optimal elastic modulus of the geomix is ​​determined, and based on the optimal elastic modulus, the anti-cracking effect of the geomix is ​​analyzed. Based on the anti-cracking effect, an anti-cracking plan for the corresponding segment joints of the asphalt concrete pavement is implemented.

2. The method for anti-cracking of asphalt concrete pavement segment joints based on odor-free technology according to claim 1, characterized in that: The step of fitting a pavement segment joint model of the segment joint based on the pavement joint data comprises: Preprocessing the pavement joint data to obtain preprocessed joint data; Analyzing the purpose of model construction of the segment joint, and determining the model framework of the segment joint based on the purpose of model construction; The joint image data, material data and environmental data of the pre-processed joint data are acquired.

3. The method for anti-cracking of asphalt concrete pavement segment joints based on odor-free technology as claimed in claim 2, characterized in that: Extracting joint image features of the joint image data, and constructing a three-dimensional geometric model of the segment joint according to the joint image features; defining model material properties of the model framework according to the material data; According to the environmental data, the boundary conditions of the model framework are defined, wherein the boundary conditions include: fixed constraint conditions, load action points and temperature change conditions; The model material properties and the boundary conditions are mapped to the three-dimensional geometric model to obtain a pavement segment joint model.

4. The method for anti-cracking of asphalt concrete pavement segment joints based on odor-free technology as claimed in claim 1, characterized in that: The analyzing the damaged area and the fractured area of ​​the pavement segment joint model based on the crack initiation point coordinates includes: Based on the crack initiation point coordinates, analyzing crack propagation data of the corresponding joint crack of the pavement segment joint model; Analyzing the effective stress of the pavement segment joint model according to the crack growth data; The material yield stress, current porosity, and porosity range of the pavement segment joint model are determined.

5. The method for anti-cracking of asphalt concrete pavement segment joints based on odor-free technology as claimed in claim 4, characterized in that: Extracting a lower porosity limit and an upper porosity limit of the porosity range, and analyzing a volume plastic strain rate of the pavement segment joint model; Calculating the damage variable of the pavement segment joint model according to the effective stress, the material yield stress, the current porosity, the porosity lower limit, the porosity upper limit and the volume plastic strain rate; According to the damage variables, damaged areas and fractured areas of the pavement segment joint model are identified.

6. The method for anti-cracking of asphalt concrete pavement segment joints based on odor-free technology as claimed in claim 1, characterized in that: The analyzing the material stiffness modulus and material relaxation modulus of the asphalt concrete corresponding to the asphalt concrete pavement includes: constructing an asphalt concrete specimen of the asphalt concrete, and measuring a support span, a specimen height, and a specimen width of the asphalt concrete specimen; Performing a static loading test on the asphalt concrete specimen to obtain a static applied load and a static displacement; The material stiffness modulus of the asphalt concrete specimen is calculated based on the support span, the specimen height, the specimen width, the static applied load, and the static displacement.

7. The method for anti-cracking of asphalt concrete pavement segment joints based on odor-free technology as claimed in claim 6, characterized in that: Performing a dynamic shear rheometer test on the asphalt concrete specimen to obtain shear stress and specimen strain; The material relaxation modulus of the asphalt concrete specimen is calculated based on the shear stress and the specimen strain.

8. The method for anti-cracking of asphalt concrete pavement segment joints based on odor-free technology as claimed in claim 1, characterized in that: The viscoelastic damage model of the asphalt concrete is constructed based on the damaged area, the fractured area, the material stiffness modulus and the material relaxation modulus, including: Based on the damaged area and the fractured area, analyzing the material behavior state of the asphalt concrete, and defining a damage evolution equation of the asphalt concrete; The model type of the asphalt concrete is determined according to the material behavior state.

9. The method for anti-cracking of segment joints of asphalt concrete pavement based on odor-free technology as claimed in claim 8, characterized in that: According to the damage evolution equation and the model type, constructing the model framework of the asphalt concrete; Mapping the material stiffness modulus and the material relaxation modulus into the model framework to obtain an initial viscoelastic damage model; The model performance of the initial viscoelastic damage model is tested, and when the model performance meets a preset model performance standard, the initial viscoelastic damage model is used as the viscoelastic damage model of the asphalt concrete.

10. An anti-cracking system for segment joints of asphalt concrete pavement based on odor-free technology, characterized in that: The system is used to implement the anti-cracking method of asphalt concrete pavement segment joint based on the odor-free technology as described in any one of claims 1 to 9, and comprises: A segment joint model module is used to obtain pavement joint data of a segment joint corresponding to an asphalt concrete pavement, and fit a pavement segment joint model of the segment joint based on the pavement joint data; A modulus parameter calculation module, used to identify the joint cracks of the pavement segment joint model, determine the crack initiation point coordinates of the joint cracks, analyze the damaged area and the fracture area of ​​the pavement segment joint model based on the crack initiation point coordinates, and analyze the material stiffness modulus and material relaxation modulus of the asphalt concrete corresponding to the asphalt concrete pavement; an asphalt viscoelastic analysis module, for constructing a viscoelastic damage model of the asphalt concrete based on the damaged area, the fracture area, the material stiffness modulus and the material relaxation modulus, calculating the viscoelastic damage coefficient of the asphalt concrete using the viscoelastic damage model, and analyzing the asphalt viscoelasticity of the asphalt concrete according to the viscoelastic damage coefficient; a pavement damage evolution module, used for fitting a crack analysis model of the segment joint, analyzing a crack extension factor of the segment joint according to the crack analysis model, and simulating the pavement damage evolution of the segment joint using a preset numerical simulation algorithm based on the crack extension factor; A viscosity effect analysis module, for obtaining the chemical additives of the asphalt concrete according to a preset deodorization technology, mixing the chemical additives with the asphalt concrete to obtain a geomix, and analyzing the viscosity effect of the geomix based on the viscoelasticity of the asphalt and the evolution of the pavement damage; The segment joint anti-cracking module is used to determine the optimal elastic modulus of the geomix based on the viscosity effect, analyze the anti-cracking effect of the geomix according to the optimal elastic modulus, and execute the anti-cracking plan of the segment joint corresponding to the asphalt concrete pavement based on the anti-cracking effect.

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