CN112364553A - Method for evaluating coupling of finite element-discrete element of surface layer seepage corrosion of ballastless track foundation bed of high-speed rail - Google Patents
Method for evaluating coupling of finite element-discrete element of surface layer seepage corrosion of ballastless track foundation bed of high-speed rail Download PDFInfo
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Abstract
The invention provides a method for evaluating the coupling of a finite element-discrete element of the surface layer seepage corrosion of a high-speed rail ballastless track bed, which comprises the following steps: acquiring an initial hydraulic gradient of a vehicle-ballastless track-saturated roadbed system power finite element model; calculating the porosity of the (n-1) step and the deformation of the discrete element model of the surface layer of the foundation bed; adjusting contact parameters and permeability coefficients of a base plate and a surface layer of a foundation bed of a vehicle-ballastless track-saturated roadbed system power finite element model, and calculating the hydraulic gradient in the nth step; YADE software calculates n +1 porosity and deformation of discrete element model of the surface layer of the foundation bed; and judging whether the porosity change exceeds a threshold value or not according to macroscopic response parameters such as a track subgrade and the like of the finite element model, and acquiring the whole dynamic process of the loss of fine particles on the surface layer of the foundation bed. The method accurately reflects the contact condition of the base plate and the surface layer of the foundation bed, obtains the microscopic process of the foundation bed slurry-turning and mud-emitting diseases, and performs coupled evaluation on the macroscopic view and the microscopic view, thereby being beneficial to the early warning of high-speed rail operation and ensuring the driving safety.
Description
Technical Field
The invention relates to the technical field of railway engineering computer-aided design, in particular to a finite element-discrete element coupling evaluation method for surface layer corrosion of a high-speed rail ballastless track bed.
Background
Years of operation practice of high-speed railways in China shows that the foundation bed surface water stability function is not considered in the early stage, the roadbed waterproof and drainage design is not complete, the roadbed is in the coupling influence of a stress field and a water seepage field under the repeated action of long-term rainfall, climate and high-frequency impact dynamic load of trains, graded broken stone fillers are granular materials with uneven grain sizes, and the ballastless track roadbed has inevitable foundation bed mortar-overturning diseases. Although the slurry pumping disease of the surface layer of the foundation bed does not influence the safe operation at present, the method becomes a problem which needs to be solved urgently in the field of high-speed railway foundations in China.
Research aiming at the problem of soil body internal corrosion has already had remarkable results in many fields. However, for the dynamic development problem of fine particle migration in railway engineering, the fine particle migration process is difficult to accurately track and quantify by tests and finite element methods, so that the development of microscopic study on the bed mud pumping disease is hindered.
Disclosure of Invention
The technical problem solved by the invention is as follows: the method overcomes the defects of the prior art and provides a finite element-discrete element coupling evaluation method for the surface layer corrosion of the ballastless track bed of the high-speed rail.
The technical solution of the invention is as follows:
in order to solve the technical problem, the invention provides a method for evaluating the coupling of a finite element-discrete element of the surface layer seepage corrosion of a high-speed rail ballastless track bed, which comprises the following steps:
creating a vehicle-ballastless track-saturated roadbed system power finite element model through COMSOL, and creating a bed surface discrete element model through YADE software;
running a JAVA interface to establish TCP connection python and COMSOL, and establishing and modifying a model by reading a python script through YADE software;
acquiring an initial hydraulic gradient of a vehicle-ballastless track-saturated roadbed system power finite element model;
introducing an initial hydraulic gradient into a discrete element model of the surface layer of the foundation bed as a boundary condition, and calculating the porosity of the discrete element model of the surface layer of the foundation bed in the (n-1) th step and the deformation of the discrete element model of the surface layer of the foundation bed, wherein the (n-1) th step is the previous time of the nth iteration, and n is the number of times of calculating data transmission between COMSOL and YADE software; and n is a natural number greater than 2;
reading the porosity of the (n-1) step and the geometric dimension of the outer contour of the discrete element model of the surface layer of the foundation bed;
counting the void area S1 of the discrete element model of the surface layer of the foundation bed in YADE software, wherein the YADE software sends the porosity of the step (n-1) and the geometric dimension of the outer contour of the discrete element model of the surface layer of the foundation bed to COMSOL;
COMSOL is according to the porosity of step n-1 and the geometric dimension of the outer contour of the discrete element model of the surface layer of the foundation bed;
determining a void fraction N by N = S1/S2, wherein S2 is the surface area of the surface of the bedding skin;
according to the void ratio N, adjusting a penalty factor of an augmented Lagrange algorithm in the contact function;
based on the above porosity in step n-1, the permeability parameters in COMSOL of the type calculated according to the input Kozenv-Garman formula,
according to an input Biot saturated soil u-P dynamic fluid-solid coupling equation, obtaining updated n-step pore water pressure and hydraulic gradient, wherein u is soil particle displacement, and P is pore water pressure;
the hydraulic gradient in the nth step is transmitted to a python script through a JAVA interface, the YADE software reads the python script, and the hydraulic gradient is adjusted to calculate the porosity in the n +1 step and the deformation of the discrete element model on the surface layer of the foundation bed, so that a data mutual iterative transmission cycle calculation process is completed;
determining a macroscopic response parameter of a track subgrade of a vehicle-ballastless track-saturated subgrade system power finite element model;
comparing the macroresponse parameter to the n +1 step porosity;
if the macroscopic response parameters do not exceed the specification limit values and the corresponding porosity variation is judged to be temporarily smaller than the threshold value, the mutual iterative transmission cyclic calculation process of the data is continuously executed;
and if the macroscopic response parameters exceed the standard limit values, judging that the porosity variation of the fine particles on the surface layer of the foundation bed is larger than a threshold value if the track subgrade, the stress, the displacement and the acceleration exceed the standard limit values, endangering the upper structure, stopping calculation, outputting results and obtaining the dynamic whole process of the fine particle loss on the surface layer of the foundation bed.
Optionally, the step of creating a dynamic finite element model of the vehicle-ballastless track-saturated roadbed system through COMSOL and creating a discrete element model of the surface layer of the roadbed through YADE software includes:
creating a dynamic finite element model of a vehicle-ballastless track-saturated roadbed system through COMSOL;
acquiring the initial porosity of a vehicle-ballastless track-saturated roadbed system power finite element model;
and establishing a YADE software foundation bed surface discrete element model based on the initial porosity and the geometric dimension of the foundation bed surface in the vehicle-ballastless track-saturated roadbed system power finite element model.
Optionally, the vehicle-ballastless track-saturated roadbed system power finite element model comprises a vehicle body, a track, a bed plate, a bed surface layer and a bed bottom layer;
the surface layer size of the foundation bed comprises the thickness, the length and the width of the surface layer of the foundation bed;
the size of the discrete element model on the surface layer of the foundation bed is the same as that of the foundation bed in a vehicle-ballastless track-saturated roadbed system power finite element model, and the porosity is the same as the initial porosity;
the solving processes of the vehicle-ballastless track-saturated roadbed system power finite element model and the bedbed surface discrete element model have the same iteration steps.
Optionally, the vehicle-ballastless track-saturated roadbed system power finite element model vehicle body adopts a rigid body, the track, the bed plate and the bed bottom layer adopt isotropic elastic media, and the bed surface layer adopts a saturated two-phase medium.
Compared with the prior art, the invention has the advantages that:
the scheme provided by the embodiment of the invention combines a finite-discrete element coupling numerical analysis method, accurately tracks and quantifies the loss and migration process of fine particles on the surface layer of the foundation bed, accurately reflects the contact condition of the foundation plate and the surface layer of the foundation bed, and combines the microscopically dynamic evolution process of the mud pumping disease of foundation bed turning. The method provides a theoretical basis for improving the stability of the surface water of the foundation bed, and carries out coupled evaluation on macroscopical and microscopic views, thereby being beneficial to the early warning of high-speed rail operation and ensuring the driving safety. The method provides a theoretical basis for improving the surface water stability of the foundation bed and provides a new idea for analyzing related similar particle loss working conditions; the analysis method has clear flow and strong reliability. The invention is an effective means for analyzing the transverse and longitudinal dynamic migration process and distribution rule of fine particles in a saturated porous medium under the action of high-speed train load.
Drawings
Fig. 1 is a flow chart illustrating steps of a finite element-discrete element coupling evaluation method for surface layer erosion of a high-speed rail ballastless track bed according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a dynamic finite element model of a vehicle-ballastless track-saturated roadbed system according to an embodiment of the invention;
fig. 3 is a schematic diagram of a discrete element model of a surface layer of a foundation bed according to an embodiment of the present invention.
Detailed Description
Those skilled in the art will appreciate that those matters not described in detail in the present specification are well known in the art.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a flowchart of steps of a finite element-discrete element coupling evaluation method for surface layer erosion of a high-speed rail ballastless track bed according to an embodiment of the present invention is shown.
The method for evaluating the surface layer seepage corrosion finite element-discrete element coupling of the ballastless track bed of the high-speed rail provided by the embodiment of the invention comprises the following steps:
step 101: a dynamic finite element model of a vehicle-ballastless track-saturated roadbed system is created through COMSOL, and a discrete element model of a surface layer of a foundation bed is created through YADE software.
JAVA creates an interface between COMSOL and YADE software, including calling a client-server class and reading the YADE software result data class.
Step 102: running a JAVA interface to establish TCP connections python and COMSOL, YADE software builds and modifies the model by reading python scripts.
The client-server subclass contains the TCP socket method, the connection COMSOL and YADE software, and the method of transferring iteration steps.
The COMSOL and YADE software establish the connection via TCP.
TCP: the Transmission Control Protocol TCP is a connection-oriented (connection-oriented) reliable Transport layer (Transport layer) communication Protocol based on byte streams, which is specified by RFC 793 of IETF (specified). In the simplified OSI-model of computer networks, which performs the functions specified by the transport layer four, UDP is another important transport protocol within the same layer.
COMSOL is a large piece of high-level numerical simulation software. The method is widely applied to scientific research and engineering calculation in various fields.
And (3) creating a vehicle-ballastless track-saturated roadbed system power finite element model through COMSOL, and as shown in FIG. 2, the vehicle-ballastless track-saturated roadbed system power finite element model is a schematic diagram. In fig. 2, 1, a base plate; 2. a surface layer of the foundation bed; 3. a base layer of the foundation bed. And obtaining the initial porosity and the initial hydraulic gradient of the dynamic finite element model of the vehicle-ballastless track-saturated roadbed system. Based on the initial porosity and the hydraulic gradient, a YADE software discrete element model of the surface layer of the foundation bed is established, and as shown in FIG. 3, a schematic diagram of the discrete element model of the surface layer of the foundation bed is shown. In fig. 3, 4 is a discrete element model of the surface layer of the bed. The discrete element model size of the surface layer of the foundation bed comprises the thickness, the length and the width of the surface layer of the foundation bed, the discrete element model size of the surface layer of the foundation bed is the same as the surface layer size of the foundation bed in the finite element, and the porosity is the same as the initial porosity.
The vehicle-ballastless track-saturated roadbed system power finite element model comprises a vehicle body, a track, a base plate, a bed surface layer and a bed bottom layer; the surface layer of the bed adopts a saturated two-phase medium.
Establishing a dynamic finite element model of a vehicle-ballastless track-saturated roadbed system, adopting rigid body units for a vehicle body, adopting isotropic elastic solid units for the track, a base plate and a foundation bed bottom layer, adopting saturated two-phase soil body units for the foundation bed surface layer, and adopting spring dampers for simulation due to vertical elasticity provided by a fastener system and a CA mortar layer; according to the actual situation of the high-speed railway ballastless track foundation bed, the horizontal displacement of the bed plate, the surface layer of the foundation bed and the bottom layer of the foundation bed is restrained, and the bottom of the model is fixedly restrained; vehicle rail interaction employs the Hertz contact model.
Step 103: and obtaining the initial hydraulic gradient of the dynamic finite element model of the vehicle-ballastless track-saturated roadbed system.
A python script capable of reading COMSOL and YADE software result data is written, and an initial hydraulic gradient is obtained by running the python script.
Hydraulic gradient refers to the ratio of head loss along the permeation pathway to the length of the permeation pathway; it is understood that the mechanical energy lost to the flow of water through the osmotic pathway per unit length to overcome frictional resistance, or the driving force for the flow of water at a certain flow rate to overcome frictional forces. Hydraulic gradient, also called hydraulic gradient, refers to head loss per unit of osmotic path in the direction of the water flow. The ground water overcomes the frictional resistance in the movement process, continuously consumes mechanical energy and generates head loss, the head loss is maximum along the flow line direction, the head value is reduced most rapidly, and the head line is a descending curve forever. The curvature of a certain point on the water head line is the hydraulic gradient of the point. Alternatively, the hydraulic gradient is the head loss per unit of percolation path along the direction of the groundwater flow.
Step 104: and (3) introducing the initial hydraulic gradient into the discrete element model of the surface layer of the foundation bed as a boundary condition, and calculating the porosity of the discrete element model of the surface layer of the foundation bed in the step (n-1) and the deformation of the discrete element model of the surface layer of the foundation bed.
Wherein, the step (n-1) is the previous time of the nth iteration, and n is the number of times of calculating the data transmission between the COMSOL software and the YADE software; and n is a natural number greater than 2.
Wherein, the step (n-1) is the previous time of the nth iteration, and n is the number of times of calculating the data transmission between the COMSOL software and the YADE software; and n is a natural number greater than 2.
Porosity is the percentage of the volume of pores in the bulk material relative to the total volume of the material in its natural state. Porosity includes true porosity, closed porosity and pre-porosity.
Another concept corresponding to the porosity of a material is the compactness of the material. Solidity, which represents the degree of filling by solids in a material, reflects the content of solids inside the material in quantities, with the effect on the material properties directly opposite to that of porosity. The porosity or compactness of the material directly reflects the compactness of the material. A high porosity of the material indicates a low degree of densification.
Step 105: and reading the porosity of the step (n-1) and the geometric dimension of the outer contour of the discrete element model of the surface layer of the foundation bed.
And reading the porosity of the step (n-1) and the geometric dimension of the outer contour of the discrete element model of the surface layer of the foundation bed through a JAVA interface.
Step 106: and (4) counting the void area S1 of the discrete element model of the surface layer of the foundation bed in YADE software, wherein the YADE software sends the porosity of the step (n-1) and the geometric dimension of the outer contour of the discrete element model of the surface layer of the foundation bed to COMSOL.
Step 107: COMSOL depends on the porosity of step n-1 and the geometry of the outer contour of the discrete element model of the surface layer of the foundation bed.
Step 108: the void fraction N was determined by N = S1/S2.
Wherein S2 is the surface area of the surface layer of the foundation bed.
Step 109: and adjusting a penalty factor of an augmented Lagrange algorithm in the contact function according to the void ratio N.
Step 110: and (3) according to the porosity of the step n-1, calculating the permeability parameter in the COMSOL according to an input Kozenv-Garman formula, and according to an input u-P dynamic fluid-solid coupling equation of the Biot saturated soil body, calculating the updated pore water pressure and hydraulic gradient of the step n.
Wherein u is the displacement of soil particles and P is the pore water pressure.
Step 111: and transmitting the hydraulic gradient of the nth step to a python script through a JAVA interface, reading the python script by YADE software, and adjusting the hydraulic gradient to calculate the porosity of the n +1 step and the deformation of the discrete element model on the surface layer of the foundation bed, thereby completing a data mutual iterative transmission cycle calculation process.
Step 112: and determining the macroscopic response parameters of the track subgrade of the vehicle-ballastless track-saturated subgrade system power finite element model.
Step 113: the macroscopic response parameter is compared to the n +1 step porosity.
Step 114: and if the macroscopic response parameters do not exceed the specification limit value and the corresponding porosity variation is judged to be temporarily smaller than the threshold value, the mutual iterative transmission cyclic calculation process of the data is continuously executed.
Step 115: and if the macroscopic response parameters exceed the standard limit values, judging that the porosity variation of the fine particles on the surface layer of the foundation bed is larger than a threshold value if the track subgrade, the stress, the displacement and the acceleration exceed the standard limit values, endangering the upper structure, stopping calculation, outputting results and obtaining the dynamic whole process of the fine particle loss on the surface layer of the foundation bed.
And the specific position of fine particle loss void is evaluated, so that political measures can be taken conveniently and pertinently, and void deterioration and subsequent safety accidents are prevented.
The whole dynamic process of the loss of the fine particles on the surface layer of the foundation bed comprises a porosity change process and a concentration change rule of the fine particles on the surface layer of the foundation bed.
The scheme provided by the embodiment of the invention combines a finite-discrete element coupling numerical analysis method, accurately tracks and quantifies the loss and migration process of fine particles on the surface layer of the foundation bed, accurately reflects the contact condition of the foundation plate and the surface layer of the foundation bed, and combines the microscopically dynamic evolution process of the mud pumping disease of foundation bed turning. The method provides a theoretical basis for improving the stability of the surface water of the foundation bed, and carries out coupled evaluation on macroscopical and microscopic views, thereby being beneficial to the early warning of high-speed rail operation and ensuring the driving safety.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (4)
1. A method for evaluating coupling of a finite element-a discrete element in seepage and erosion of a high-speed railway ballastless track bed surface layer is characterized by comprising the following steps:
creating a vehicle-ballastless track-saturated roadbed system power finite element model through COMSOL, and creating a bed surface discrete element model through YADE software;
running a JAVA interface to establish TCP connection python and COMSOL, and establishing and modifying a model by reading a python script through YADE software;
acquiring an initial hydraulic gradient of a vehicle-ballastless track-saturated roadbed system power finite element model;
introducing an initial hydraulic gradient into a discrete element model of the surface layer of the foundation bed as a boundary condition, and calculating the porosity of the discrete element model of the surface layer of the foundation bed in the (n-1) th step and the deformation of the discrete element model of the surface layer of the foundation bed, wherein the (n-1) th step is the previous time of the nth iteration, and n is the number of times of calculating data transmission between COMSOL and YADE software; and n is a natural number greater than 2;
reading the porosity of the (n-1) step and the geometric dimension of the outer contour of the discrete element model of the surface layer of the foundation bed;
counting the void area S1 of the discrete element model of the surface layer of the foundation bed in YADE software, wherein the YADE software sends the porosity of the step (n-1) and the geometric dimension of the outer contour of the discrete element model of the surface layer of the foundation bed to COMSOL;
COMSOL is according to the porosity of step n-1 and the geometric dimension of the outer contour of the discrete element model of the surface layer of the foundation bed;
determining a void fraction N by N = S1/S2, wherein S2 is the surface area of the surface of the bedding skin;
according to the void ratio N, adjusting a penalty factor of an augmented Lagrange algorithm in the contact function;
based on the above porosity in step n-1, the permeability parameters in COMSOL of the type calculated according to the input Kozenv-Garman formula,
according to an input Biot saturated soil u-P dynamic fluid-solid coupling equation, obtaining updated n-step pore water pressure and hydraulic gradient, wherein u is soil particle displacement, and P is pore water pressure;
the hydraulic gradient in the nth step is transmitted to a python script through a JAVA interface, the YADE software reads the python script, and the hydraulic gradient is adjusted to calculate the porosity in the n +1 step and the deformation of the discrete element model on the surface layer of the foundation bed, so that a data mutual iterative transmission cycle calculation process is completed;
determining a macroscopic response parameter of a track subgrade of a vehicle-ballastless track-saturated subgrade system power finite element model;
comparing the macroresponse parameter to the n +1 step porosity;
if the macroscopic response parameters do not exceed the specification limit values and the corresponding porosity variation is judged to be temporarily smaller than the threshold value, the mutual iterative transmission cyclic calculation process of the data is continuously executed;
and if the macroscopic response parameters exceed the standard limit values, judging that the porosity variation of the fine particles on the surface layer of the foundation bed is larger than a threshold value if the track subgrade, the stress, the displacement and the acceleration exceed the standard limit values, endangering the upper structure, stopping calculation, outputting results and obtaining the dynamic whole process of the fine particle loss on the surface layer of the foundation bed.
2. The method for evaluating the coupling of the seepage finite element and the discrete element of the surface layer of the high-speed railway ballastless track bed according to claim 1, wherein the step of creating the dynamic finite element model of the vehicle-ballastless track-saturated roadbed system through COMSOL and the step of creating the discrete element model of the surface layer of the bed through YADE software comprise the following steps:
creating a dynamic finite element model of a vehicle-ballastless track-saturated roadbed system through COMSOL;
acquiring the initial porosity of a vehicle-ballastless track-saturated roadbed system power finite element model;
and establishing a YADE software foundation bed surface discrete element model based on the initial porosity and the geometric dimension of the foundation bed surface in the vehicle-ballastless track-saturated roadbed system power finite element model.
3. The method for evaluating the coupling of the seepage finite element and the discrete element of the surface layer of the high-speed rail ballastless track bed according to claim 1, wherein the dynamic finite element model of the vehicle-ballastless track-saturated roadbed system comprises a vehicle body, a track, a base plate, a bed surface layer and a bed bottom layer;
the surface layer size of the foundation bed comprises the thickness, the length and the width of the surface layer of the foundation bed;
the size of the discrete element model on the surface layer of the foundation bed is the same as that of the foundation bed in a vehicle-ballastless track-saturated roadbed system power finite element model, and the porosity is the same as the initial porosity;
the solving processes of the vehicle-ballastless track-saturated roadbed system power finite element model and the bedbed surface discrete element model have the same iteration steps.
4. The method for evaluating the coupling of the seepage finite element and the discrete element on the surface layer of the high-speed rail ballastless track foundation bed according to claim 3, wherein the vehicle-ballastless track-saturated roadbed system dynamic finite element model adopts a rigid body, the track, the bed plate and the foundation bed layer adopt elastic media, and the foundation bed surface layer adopts a saturated two-phase medium.
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| CN113887092B (en) * | 2021-08-31 | 2023-03-31 | 浙江工业大学 | Discrete element model construction method for pumping water by geotextile wrapped slurry and drainage plate |
| CN114491781A (en) * | 2022-04-08 | 2022-05-13 | 西南交通大学 | Ballastless track foundation bed damage early warning method and system considering uncertainty |
| CN114491781B (en) * | 2022-04-08 | 2022-07-01 | 西南交通大学 | Ballastless track foundation bed damage early warning method and system considering uncertainty |
| CN116628784A (en) * | 2023-07-19 | 2023-08-22 | 天河超级计算淮海分中心 | Optimization method for parameters of gyratory grinding equipment |
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