A theoretical model establishment and verification method for assembled elastic solidified track bed track structure

Abstract

The present invention discloses a method for establishing and verifying a theoretical model of an assembled elastically cured track bed track structure, comprising establishing a rail model, a sleeper model, a composite unit block model, an adjustment layer model, and a lower foundation model; assembling the adjustment layer model onto the lower foundation model, assembling the composite unit block model onto the adjustment layer model, assembling the sleeper model onto the composite unit block model, and assembling the rail model onto the sleeper model; connecting a spring model between the rail model and the sleeper model for simulating a fastener system and backfilling gravel; and assigning material parameters to obtain a theoretical model of an assembled elastically cured track bed track structure. The present invention can solve the problem of a lack of theoretical and experimental research methods for the service status of assembled elastically cured track beds in the prior art, achieve the purpose of establishing and verifying a theoretical model of an assembled elastically cured track bed, and provide scientific support for the research and promotion of assembled elastically cured track bed track structures.

Description

Technical Field

[0001] The present invention relates to the field of rail transportation, and in particular to a method for establishing and verifying a theoretical model of an assembled elastically cured track bed track structure. Background Art

[0002] my country's vast territory and the fact that many railway lines traverse seismic zones pose significant challenges to track structure adaptability. my country's railways primarily utilize both ballastless and ballasted track. While ballastless track offers superior overall structural performance, in areas with unique geological conditions, the risk of deformation of the underlying foundation is significant, necessitating the installation of ballasted track. However, ballasted track requires frequent maintenance and repair, making it difficult to adapt to special conditions such as high altitudes and long tunnels. The use of a prefabricated elastically cured track bed structure can meet the demands for low-maintenance, easily repairable track structures in active seismic fault zones.

[0003] However, as a new track structure, the existing technology lacks theoretical and experimental research methods for the service status of prefabricated elastic cured roadbed. It is difficult to grasp the dynamic response and service status change law of prefabricated elastic cured roadbed track structure under complex load fields, making it difficult to promote and apply prefabricated elastic cured roadbed track structure on a large scale. Summary of the Invention

[0004] The present invention provides a method for establishing and verifying a theoretical model of an assembled elastic solidified roadbed track structure, so as to solve the problem that the prior art lacks theoretical and experimental research methods for the service status of the assembled elastic solidified roadbed, and realizes the purpose of establishing and verifying a theoretical model of the assembled elastic solidified roadbed, thereby providing scientific support for the research and promotion of the assembled elastic solidified roadbed track structure.

[0005] The present invention is achieved through the following technical solutions:

[0006] A method for establishing a theoretical model of an assembled elastically cured track bed track structure comprises:

[0007] Establish rail model, sleeper model, composite unit block model, adjustment layer model and lower foundation model;

[0008] Assembling the adjustment layer model onto the lower base model, assembling the composite unit block model onto the adjustment layer model, assembling the sleeper model onto the composite unit block model, and assembling the rail model onto the sleeper model;

[0009] connecting a first spring model between the rail model and the sleeper model, and arranging a second spring model around the composite unit block model;

[0010] Material parameters are assigned to the rail model, sleeper model, composite unit block model, adjustment layer model, and lower foundation model respectively to obtain a theoretical model of the assembled elastic solidified roadbed track structure.

[0011] To address the current lack of theoretical and experimental research methods for the service life of prefabricated elastically cured trackbeds, this paper proposes a method for establishing a theoretical model of a track structure for a prefabricated elastically cured trackbed. This method first establishes models of the rail, sleeper, composite unit block, adjustment layer, and subgrade, and then assembles these models based on the actual on-site conditions. A first spring model is then connected between the rail and sleeper models to simulate the fastener system. A second spring model is positioned around the composite unit block model to simulate the effect of backfill gravel on the composite unit block. Finally, material parameters are assigned to each component of the assembled model to obtain the desired theoretical model of the prefabricated elastically cured trackbed. The subgrade model can be configured to suit the specific subgrade conditions of the test subject. For example, if the analysis of a prefabricated elastically cured trackbed within a tunnel is desired, the subgrade model is established as a tunnel model; if the analysis of a prefabricated elastically cured trackbed on a conventional roadbed is desired, the subgrade model is established as a conventional roadbed model. In addition, the first spring model and the second spring model in this method can both be implemented using existing spring model structures, and are not specifically limited here.

[0012] This method establishes a theoretical model of the prefabricated elastic cured roadbed track structure, which can be used to study the static mechanical properties and dynamic response of the prefabricated elastic cured roadbed track structure, to study the damage-sensitive characteristics of the prefabricated elastic cured roadbed track structure, and to reveal the load transfer mechanism and energy transfer law of the elastic cured roadbed track structure. It provides scientific support for the research and promotion of the prefabricated elastic cured roadbed track structure and is of great value to the exploration and development of track structure technology.

[0013] Furthermore, the adjustment layer model is modeled using solid units; the sleeper model and the composite unit block model are both modeled using the prony series constitutive model, which can better simulate the viscoelastic characteristics of the actual polyurethane-gravel composite unit block, and is conducive to improving the accuracy of the theoretical model of the assembled elastic cured track bed track structure.

[0014] A method for verifying a theoretical model of an assembled elastically cured track bed track structure is provided for verifying the theoretical model of an assembled elastically cured track bed track structure established in this application. The method comprises:

[0015] In the simulation software, train loads and / or earthquake loads are applied to the theoretical model of the assembled elastically cured track bed track structure, and simulation is performed to obtain dynamic response data at a specified position, which is defined as a first parameter set;

[0016] Establish a full-scale test platform for prefabricated elastically cured roadbed;

[0017] Conducting a full-scale test of the prefabricated elastic cured roadbed on the full-scale test platform; during the full-scale test, applying the same train load and / or earthquake load as in the simulation to the prefabricated elastic cured roadbed, and collecting actual dynamic response data at the designated location, which is defined as a second parameter set;

[0018] The first parameter set and the second parameter set are compared to verify the accuracy of the theoretical model of the assembled elastically cured track bed track structure.

[0019] Regarding the theoretical model of the prefabricated elastic cured track bed structure, since there is no good modeling technology in the existing technology, the accuracy of the model established by the method of this application cannot be effectively verified by the existing technology; based on this, this application also proposes a special verification method for verifying the accuracy of the established theoretical analysis model.

[0020] Specifically, the verification method first performs a simulation in the simulation software to simulate the established theoretical model of the prefabricated elastic cured roadbed track structure, and the dynamic response when subjected to specified train loads and / or seismic loads, and obtains the dynamic response data of the specified position in the model, and defines it as the first parameter set for standby. Afterwards, a full-scale test platform that can be used for the prefabricated elastic cured roadbed is established, and a full-scale test is carried out on the actual object of the prefabricated elastic cured roadbed. The type and size of the load applied during the test are consistent with those in the numerical simulation, and the actual dynamic response data are collected at the same specified position on the actual object, and defined as the second parameter set. After obtaining the first parameter set and the second parameter set, the present application compares the first parameter set with the second parameter set, and can verify the accuracy of the theoretical model of the prefabricated elastic cured roadbed track structure through the results of the full-scale test.

[0021] It can be seen that the present application can effectively verify the established theoretical model of the prefabricated elastic cured track bed structure, filling the gap in the existing technology, and is conducive to more accurate simulation of the load transfer of the prefabricated elastic cured track bed structure, thereby providing scientific and reasonable support for the study of the static and dynamic mechanical behavior and energy dissipation law of the prefabricated elastic cured track bed.

[0022] Furthermore, the full-scale test platform includes:

[0023] Full-scale test trough, used for installing prefabricated elastically cured roadbed;

[0024] a top loading device, located above the full-scale test trough, for applying a train load to the assembled elastically cured roadbed;

[0025] A bottom loading device, located below the full-scale test trough, for applying a seismic load to the assembled elastically cured roadbed;

[0026] The monitoring system is used to collect actual dynamic response data of the designated position.

[0027] During their in-depth research, the inventors of this case discovered that the prior art lacks a dedicated full-scale test platform for prefabricated elastically cured trackbed track structures. Traditional track structure test equipment has the defects of low efficiency, difficulty in quickly obtaining the response of prefabricated elastically cured trackbed track structures, and inability to simulate changes in the service status of track structures under earthquake conditions.

[0028] To this end, this proposal designs a dedicated full-scale test platform, which can solve the above-mentioned defects of traditional track structure test equipment, improve the efficiency of full-scale testing of prefabricated elastic cured roadbed, quickly obtain the dynamic response of prefabricated elastic cured roadbed track structure under different loads, and provide an effective reference for verifying the theoretical model of prefabricated elastic cured roadbed track structure.

[0029] In practice, this solution involves installing the prefabricated elastically cured roadbed in a full-scale test trough. A top-loading device simulates a train load from the top of the prefabricated elastically cured roadbed, while a bottom-loading device simulates an earthquake load from the bottom. A monitoring system monitors the dynamic response data of the prefabricated elastically cured roadbed during the test. The monitoring system can be equipped with sensors and other monitoring equipment based on the actual dynamic response data required to achieve its functions.

[0030] Furthermore, the full-scale test trough includes a trough body, a prefabricated bottom plate detachably laid in the trough body, and a braked roller connected to the bottom of the trough body.

[0031] This solution lays a removable prefabricated base plate in the trough, which allows for flexible replacement of prefabricated base plates with different stiffnesses. This allows for simulation of different track substructure conditions, making the test environment of the full-scale test model closer to that of the theoretical model, which is beneficial for reducing test errors and ensuring the accuracy of verification results. For example, in simulating substructure conditions of roadbeds and bridges and tunnels, prefabricated base plates with relatively low stiffness are used for roadbeds to simulate flexible substructure conditions, while prefabricated base plates with relatively high stiffness are used for bridges and tunnels to simulate rigid substructure conditions.

[0032] Furthermore, the designated position includes any one or more of the following positions: the side of the rail, the end of the sleeper, the side wall of the composite unit block, and the groove wall of the full-scale test groove;

[0033] The dynamic response data includes displacement and vibration acceleration;

[0034] The monitoring system includes a displacement sensor and an acceleration sensor.

[0035] Furthermore, the method for verifying the accuracy of the theoretical model of the assembled elastically cured track bed structure includes:

[0036] Extract the vertical displacement of the rail from the first parameter set and the second parameter set respectively, and calculate the displacement accuracy δ1:

[0037]

[0038] Extract the vertical acceleration of the sleeper from the first parameter set and the second parameter set respectively, and calculate the acceleration accuracy δ2:

[0039]

[0040] Calculate the total accuracy δ of the theoretical model: δ = δ1 × W1 + δ2 × W2;

[0041] Where: P1 is the vertical displacement of the rail in the second parameter set; Q is the vertical displacement of the rail in the first parameter set; P2 is the vertical acceleration of the sleeper in the second parameter set; S is the vertical acceleration of the sleeper in the first parameter set; W1 is the displacement accuracy weight; W2 is the acceleration accuracy weight.

[0042] In this solution, the displacement accuracy is determined by the vertical displacement of the rail, and the acceleration accuracy is determined by the vertical acceleration of the sleeper. The displacement accuracy and acceleration accuracy and their respective weights are then combined to obtain the overall accuracy of the theoretical model. If the overall accuracy meets the preset threshold, it can be proved that the accuracy of the theoretical model meets the requirements; conversely, if the overall accuracy does not meet the preset threshold, it indicates that the accuracy of the theoretical model does not meet the requirements, and it is necessary to return to the modeling step to optimize the relevant structural models or material parameters in the theoretical model of the prefabricated elastic cured track bed track structure.

[0043] The specific values ​​of the displacement accuracy weight W1 and the acceleration accuracy weight W2 can be obtained by traditional methods such as empirical value selection and expert scoring method.

[0044] Furthermore, considering the high randomness and high degree of dispersion of seismic wave signals, when studying the impact of different characteristics of seismic loads on the dynamic response of prefabricated elastically cured roadbeds, the traditional weighting method is subject to significant interference from human factors and is highly subjective. To this end, this proposal also proposes improvements and optimizations to the specific calculation methods of the displacement accuracy weight W1 and the acceleration accuracy weight W2. The specific process includes:

[0045] N groups of different seismic waves are used to simulate the theoretical model of the assembled elastic solidified track bed track structure, and the original data matrix X of the theoretical model dynamic response is obtained:

[0046]

[0047] Where: X ij Represents the value of the i-th dynamic response parameter under the j-th earthquake wave; i = 1, 2, 3, 4, 5, 6, representing vertical displacement response, vertical acceleration response, lateral displacement response, lateral acceleration response, longitudinal displacement response, and longitudinal acceleration response, respectively; j = 1, 2, …, N;

[0048] Normalize the matrix X to get the matrix Y:

[0049]

[0050] Based on the matrix Y, calculate the proportion of each dynamic response parameter under N groups of different seismic waves, Y ij For X ij Normalized value;

[0051] Based on the proportion of each dynamic response parameter under N groups of different seismic waves, the entropy value of each dynamic response parameter is calculated;

[0052] Based on the entropy value of each dynamic response parameter, the accuracy weight of each dynamic response parameter is calculated, and the displacement accuracy weight W1 and the acceleration accuracy weight W2 are extracted therefrom.

[0053] As can be seen, in this scheme, six dynamic response parameters are specified. Therefore, both matrices X and Y have six rows. Matrix X can be normalized using any existing normalization method, without further limitation. This method can be used to obtain the accuracy weights corresponding to the six dynamic response parameters, from which the required displacement accuracy weight W1 and acceleration accuracy weight W2 can be extracted.

[0054] The weight calculation method of this scheme is particularly suitable for studying the influence of different characteristics of seismic loads on the dynamic response of prefabricated elastic cured roadbeds, and can overcome the interference caused by the strong randomness and large discreteness of seismic wave signals; and this method obtains the optimal weight through the actual data of seismic wave samples, avoiding the influence of human factors, and has high reproducibility and credibility; compared with existing technologies, it has the advantages of strong objectivity, large amount of information, high accuracy, and can fully consider the data discreteness of various indicators, making the weight distribution more reasonable and scientific.

[0055] Furthermore, the weight of each dynamic response parameter under N groups of different seismic waves is calculated using the following formula:

[0056]

[0057] Where: k ijRepresents the proportion of the i-th dynamic response parameter under the j-th earthquake wave;

[0058] The entropy value of each dynamic response parameter is calculated using the following formula:

[0059]

[0060] Where: E i represents the entropy value of the i-th dynamic response parameter;

[0061] The accuracy weight of each dynamic response parameter is calculated using the following formula:

[0062]

[0063] Where: W i Represents the accuracy weight of the i-th dynamic response parameter.

[0064] Furthermore, when calculating the displacement accuracy weight W1, the data of the theoretical model dynamic response original data matrix X are taken from the side of the rail; when calculating the acceleration accuracy weight W2, the data of the theoretical model dynamic response original data matrix X are taken from the end of the sleeper.

[0065] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0066] 1. The present invention establishes a theoretical model of prefabricated elastically cured track bed structure, which can be used to study the static mechanical properties and dynamic response of prefabricated elastically cured track bed structure, to study the damage-sensitive characteristics of prefabricated elastically cured track bed structure, and to reveal the load transfer mechanism and energy transfer law of the elastically cured track bed structure. It provides scientific support for the research and promotion of prefabricated elastically cured track bed structure and is of great value to the exploration and development of track structure technology.

[0067] 2. The present invention can effectively verify the established theoretical model of the prefabricated elastic cured track bed structure, filling the gap in the existing technology. It is also conducive to more accurate simulation of the load transfer of the prefabricated elastic cured track bed structure, and thus provides scientific and reasonable support for the study of the static and dynamic mechanical behavior and energy dissipation law of the prefabricated elastic cured track bed.

[0068] 3. The present invention defines a weight calculation method for dynamic response parameters, which is suitable for studying the influence of different characteristics of seismic loads on the dynamic response of prefabricated elastic cured roadbed. It can overcome the interference caused by the strong randomness and large discreteness of seismic wave signals, avoid the influence of human factors, and has high reproducibility and credibility.

[0069] 4. The present invention designs a full-scale test platform that can solve many defects of traditional track structure test equipment, achieve the purpose of improving the full-scale test efficiency of prefabricated elastic cured roadbed, quickly obtaining the dynamic response of prefabricated elastic cured roadbed track structure under different loads, and providing an effective reference for verifying the theoretical model of prefabricated elastic cured roadbed track structure.

[0070] The present invention can simulate different track substructure conditions and make the test environment of the full-scale test model closer to that of the theoretical model, which is beneficial to reducing test errors and ensuring the accuracy of verification results. BRIEF DESCRIPTION OF THE DRAWINGS

[0071] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention. In the drawings:

[0072] Figure 1 A schematic flow chart of a model building method in a specific embodiment of the present invention;

[0073] Figure 2 It is a partial schematic diagram of a theoretical model of an assembled elastically cured track bed track structure in a specific embodiment of the present invention;

[0074] Figure 3 This is a schematic diagram of a model in a tunnel in a specific embodiment of the present invention;

[0075] Figure 4 A schematic diagram of a flow chart of a model verification method in a specific embodiment of the present invention;

[0076] Figure 5 This is a schematic diagram of the partial structure of the full-scale test platform after omitting the full-scale test groove in a specific embodiment of the present invention;

[0077] Figure 6 Schematic diagram of a full-scale test tank in a specific embodiment of the present invention.

[0078] Markings and corresponding parts names in the accompanying drawings:

[0079] 1- trough body, 2- prefabricated bottom plate, 3- top loading device, 4- adjustment layer, 5- assembled composite unit block, 6- sleeper, 7- rail, 8- rail model, 9- sleeper model, 10- composite unit block model, 11- adjustment layer model, 12- spring model. DETAILED DESCRIPTION

[0080] In order to make the objects, technical solutions and advantages of the present invention more clear, the present invention is further described in detail below in conjunction with the examples and drawings. The schematic embodiments of the present invention and their description are only used to explain the present invention and are not intended to limit the present invention. In the description of this application, it should be understood that the orientations or positional relationships indicated by terms such as "front", "back", "left", "right", "up", "down", "vertical", "horizontal", "high", "low", "inside", "outside", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of this application.

[0081] Example 1:

[0082] like Figure 1 A method for establishing a theoretical model of an assembled elastically cured track bed structure is shown, comprising:

[0083] Establishing a rail model, a sleeper model, a composite unit block model, an adjustment layer model and a lower foundation model; wherein the adjustment layer model is modeled using solid units; and the sleeper model and the composite unit block model are both modeled using a prony series constitutive model;

[0084] like Figure 2 As shown, the composite unit block model is assembled onto the adjustment layer model, the sleeper model is assembled onto the composite unit block model, and the rail model is assembled onto the sleeper model;

[0085] Setting constraint conditions: connecting a first spring model between the rail model and the sleeper model to simulate the constraint effect of the fastener system on the rail; and setting a second spring model around the composite unit block model to simulate the constraint effect of backfill gravel on the composite unit block;

[0086] Then assemble the adjustment layer model onto the lower base model; Figure 3 Shown is a schematic diagram when the lower foundation model adopts a tunnel model;

[0087] Material parameters are assigned to the rail model, sleeper model, composite unit block model, adjustment layer model, and lower foundation model respectively to obtain a theoretical model of the assembled elastic solidified roadbed track structure.

[0088] Example 2:

[0089] A method for verifying a theoretical model of an assembled elastically cured track bed structure is used to verify the theoretical model of an assembled elastically cured track bed structure established by the method of Example 1. The specific verification method is as follows: Figure 4Shown, including:

[0090] S1. Applying train loads and / or earthquake loads to the theoretical model of the assembled elastically cured track bed in simulation software to obtain dynamic response data at a specified position, which is defined as a first parameter set.

[0091] S2. Establish a full-scale test platform for prefabricated elastically cured roadbed;

[0092] S3. Conducting a full-scale test of the prefabricated elastically cured roadbed on the full-scale test platform; during the full-scale test, applying the same train load and / or earthquake load as in the simulation to the prefabricated elastically cured roadbed, and collecting actual dynamic response data at the designated location, which is defined as a second parameter set;

[0093] S4. Comparing the first parameter set with the second parameter set to verify the accuracy of the theoretical model of the assembled elastically cured track bed track structure; specifically comprising:

[0094] Extract the vertical displacement of the rail from the first parameter set and the second parameter set respectively, and calculate the displacement accuracy δ1:

[0095]

[0096] Extract the vertical acceleration of the sleeper from the first parameter set and the second parameter set respectively, and calculate the acceleration accuracy δ2:

[0097]

[0098] Calculate the total accuracy δ of the theoretical model: δ = δ1 × W1 + δ2 × W2;

[0099] Where: P1 is the vertical displacement of the rail in the second parameter set; Q is the vertical displacement of the rail in the first parameter set; P2 is the vertical acceleration of the sleeper in the second parameter set; S is the vertical acceleration of the sleeper in the first parameter set; W1 is the displacement accuracy weight; W2 is the acceleration accuracy weight.

[0100] In a more preferred embodiment, the displacement accuracy weight W1 and the acceleration accuracy weight W2 are calculated using the following method:

[0101] S401, using N groups of different seismic waves, respectively simulate the theoretical model of the assembled elastic solidified track bed track structure to obtain the original data matrix X of the theoretical model dynamic response:

[0102]

[0103] Where: X ijRepresents the value of the i-th dynamic response parameter under the j-th earthquake wave; i = 1, 2, 3, 4, 5, 6, representing vertical displacement response, vertical acceleration response, lateral displacement response, lateral acceleration response, longitudinal displacement response, and longitudinal acceleration response, respectively; j = 1, 2, …, N;

[0104] S402. Normalize the matrix X to obtain the matrix Y:

[0105]

[0106] S403, respectively calculate the weight k of each dynamic response parameter under N groups of different seismic waves ij :

[0107]

[0108] Where: k ij Represents the proportion of the i-th dynamic response parameter under the j-th earthquake wave;

[0109] S404. Calculate the entropy value E of each dynamic response parameter i :

[0110]

[0111] Where: E i represents the entropy value of the i-th dynamic response parameter;

[0112] S405. Calculate the accuracy weight W of each dynamic response parameter i :

[0113]

[0114] Where: W i represents the accuracy weight of the i-th dynamic response parameter;

[0115] S406 : Extract the displacement accuracy weight W1 and / or the acceleration accuracy weight W2 .

[0116] Wherein, N≥50, and in this embodiment, N=100 is preferably taken.

[0117] In this embodiment, the displacement accuracy weight W1 and the acceleration accuracy weight W2 are calculated twice:

[0118] First, values ​​are taken from the rail side to establish the theoretical model dynamic response original data matrix X, and steps S401 to S406 are executed to obtain the displacement accuracy weight W1;

[0119] Then, the values ​​are taken from the end of the sleeper, the original data matrix X of the theoretical model dynamic response is re-established, and steps S401 to S406 are re-executed to obtain the acceleration accuracy weight W2.

[0120] In a more preferred embodiment, when calculating the displacement accuracy δ1, in addition to extracting the vertical displacement of the rail, the lateral displacement and longitudinal displacement of the rail can also be extracted. After calculating the three displacement accuracies, the average value is taken, and the average value is used as δ1; similarly, when calculating the acceleration accuracy δ2, in addition to extracting the vertical acceleration of the rail, the lateral acceleration and longitudinal acceleration of the sleeper can also be extracted. After calculating the three acceleration accuracies, the average value is taken, and the average value is used as δ2.

[0121] Those skilled in the art should understand that the horizontal, vertical and horizontal directions in this application are based on the XYZ three-axis coordinate system in the model; for example, the X-axis direction is the horizontal direction, the Y-axis direction is the vertical direction, and the Z-axis direction is the longitudinal direction, where the Y-axis direction is the direction of gravity and the Z-axis direction is the direction consistent with the extension of the track on the horizontal plane.

[0122] Example 3:

[0123] A full-scale test platform for an assembled elastically cured roadbed can be used in the verification method of Example 2. The platform structure is as follows: Figure 5 and Figure 6 Shown, including:

[0124] A full-scale test trough, used for installing prefabricated elastically cured roadbed, comprises a trough body 1 and a prefabricated base plate 2 that is detachably placed within the trough body. The prefabricated base plate 2 can be connected to the trough body 1 using any existing detachable connection method, such as bolts, snap-fit ​​connections, or mortise and tenon joints.

[0125] A top loading device 3, located above the full-scale test trough, is used to apply train load to the assembled elastically cured roadbed;

[0126] A bottom loading device, located below the full-scale test trough, for applying a seismic load to the assembled elastically cured roadbed;

[0127] The monitoring system is used to collect actual dynamic response data of the designated position.

[0128] In this embodiment, the aforementioned designated positions include all of the following positions: the side of the rail, the end of the sleeper, the side wall of the composite unit block, and the groove wall of the full-scale test groove; the monitoring system is equipped with displacement sensors and acceleration sensors at all of the aforementioned positions, which are respectively used to monitor the displacement and acceleration of the corresponding positions.

[0129] Those skilled in the art should understand that: the side surface of the rail refers to the outer side wall of the rail along the horizontal direction of the track; the end of the sleeper refers to the center position on both sides of the top surface of the sleeper; the side wall of the composite unit block refers to the outer side wall of the composite unit block along the horizontal direction of the track; the groove wall of the full-scale test groove refers to the outer side wall of the groove body 1 along the horizontal direction of the track.

[0130] In a more preferred embodiment, a braked roller, such as a braked universal wheel, may be installed at the bottom of the tank body 1 .

[0131] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

[0132] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises", or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In addition, the term "connected" as used in this document, unless otherwise specified, may refer to a direct connection or an indirect connection via other components.

Claims

1. A method for verifying a theoretical model of an assembled elastically cured track bed structure, characterized in that: The theoretical model of the assembled elastic solidified track bed is established by the following methods: Establish rail model, sleeper model, composite unit block model, adjustment layer model and lower foundation model; Assembling the adjustment layer model onto the lower base model, assembling the composite unit block model onto the adjustment layer model, assembling the sleeper model onto the composite unit block model, and assembling the rail model onto the sleeper model; connecting a first spring model between the rail model and the sleeper model, and arranging a second spring model around the composite unit block model; Assigning material parameters to the rail model, sleeper model, composite unit block model, adjustment layer model, and lower foundation model respectively to obtain a theoretical model of the assembled elastic solidified roadbed track structure; The adjustment layer model is modeled using solid units; the sleeper model and the composite unit block model are both modeled using the prony series constitutive model; The verification method is used to verify the established theoretical model of the assembled elastically cured track bed track structure, and the verification method includes: In the simulation software, train loads and / or earthquake loads are applied to the theoretical model of the assembled elastically cured track bed track structure, and simulation is performed to obtain dynamic response data at a specified position, which is defined as a first parameter set; Establish a full-scale test platform for prefabricated elastically cured roadbed; Conducting a full-scale test of the prefabricated elastic cured roadbed on the full-scale test platform; during the full-scale test, applying the same train load and / or earthquake load as in the simulation to the prefabricated elastic cured roadbed, and collecting actual dynamic response data at the designated location, which is defined as a second parameter set; Comparing the first parameter set with the second parameter set to verify the accuracy of the theoretical model of the assembled elastically cured track bed; The full-scale test platform includes: Full-scale test trough, used for installing prefabricated elastically cured roadbed; a top loading device, located above the full-scale test trough, for applying a train load to the assembled elastically cured roadbed; A bottom loading device, located below the full-scale test trough, for applying a seismic load to the assembled elastically cured roadbed; The monitoring system is used to collect actual dynamic response data of the designated position.

2. The method for verifying the theoretical model of the assembled elastically cured track bed structure according to claim 1 is characterized in that: The full-scale test trough includes a trough body, a prefabricated bottom plate detachably laid in the trough body, and a braked roller connected to the bottom of the trough body.

3. The method for verifying the theoretical model of the assembled elastically cured track bed structure according to claim 1, characterized in that: The designated position includes any one or more of the following positions: the side of the rail, the end of the sleeper, the side wall of the composite unit block, and the wall of the full-scale test groove; The dynamic response data includes displacement and vibration acceleration; The monitoring system includes a displacement sensor and an acceleration sensor.

4. The method for verifying a theoretical model of an assembled elastically cured track bed structure according to claim 1, characterized in that: The method for verifying the accuracy of the theoretical model of the assembled elastically cured track bed structure includes: Extract the vertical displacement of the rail from the first parameter set and the second parameter set respectively, and calculate the displacement accuracy δ 1: ； Extract the vertical acceleration of the sleeper from the first parameter set and the second parameter set respectively, and calculate the acceleration accuracy δ 2: ； Calculate the overall accuracy of the theoretical model δ : δ = δ 1× W 1+ δ 2× W 2; in: P 1 is the vertical displacement of the rail in the second parameter set; Q is the vertical displacement of the rail in the first parameter set; P 2 is the vertical acceleration of the sleeper in the second parameter set; S is the vertical acceleration of the sleeper in the first parameter set; W 1 is the displacement accuracy weight; W 2 is the acceleration accuracy weight.

5. The method for verifying the theoretical model of the assembled elastically cured track bed structure according to claim 4 is characterized in that: Displacement accuracy weight W 1. Acceleration accuracy weight W 2 calculation methods include: use N The theoretical model of the assembled elastic solidified track bed is simulated by using different sets of seismic waves to obtain the original data matrix of the theoretical model dynamic response. X : ； in: X ij Represents the value of the i-th dynamic response parameter under the j-th earthquake wave; i=1,2,3,4,5,6, respectively represent vertical displacement response, vertical acceleration response, lateral displacement response, lateral acceleration response, longitudinal displacement response, longitudinal acceleration response; j=1,2,…, N ; Pair Matrix X Perform normalization to obtain the matrix Y : ； Matrix-based Y , calculate each dynamic response parameter separately in N The proportion of different seismic waves, Y ij for X ij Normalized value; Based on each dynamic response parameter N The specific gravity of each group under different seismic waves is calculated, and the entropy value of each dynamic response parameter is calculated; Based on the entropy value of each dynamic response parameter, the accuracy weight of each dynamic response parameter is calculated, and the displacement accuracy weight is extracted from it. W 1. Acceleration accuracy weight W 2.

6. The method for verifying the theoretical model of the assembled elastically cured track bed structure according to claim 5, characterized in that: Each dynamic response parameter is N The specific gravity of a group of different seismic waves is calculated by the following formula: ； Where: k ij Represents the proportion of the i-th dynamic response parameter under the j-th earthquake wave; The entropy value of each dynamic response parameter is calculated using the following formula: ； Where: E i represents the entropy value of the i-th dynamic response parameter; The accuracy weight of each dynamic response parameter is calculated using the following formula: ； Where: W i Represents the accuracy weight of the i-th dynamic response parameter.

7. The method for verifying a theoretical model of an assembled elastically cured track bed structure according to claim 5, characterized in that: When calculating displacement accuracy weights W 1, the theoretical model dynamic response original data matrix X The data is taken from the side of the rail; when calculating the acceleration accuracy weight W 2, the theoretical model dynamic response original data matrix X The data is taken from the end of the sleeper.

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