Method for building vibration response three-dimensional numerical models of railway roadbeds in seasonally frozen ground regions in parameterized manner

Abstract

The invention discloses a method for building vibration response three-dimensional numerical models of railway roadbeds in seasonally frozen ground regions in a parameterized manner, and relates to a parameterized modeling method by the aid of computers. By the aid of the method, problems that existing finite element modeling is mainly carried out via manual GUI (graphical user interface) operation and is low in efficiency and unfavorable for vibration response characteristic research and influence factor analysis on railway roadbeds in seasonally frozen ground regions under train loads and the like can be solved. The method includes building railway roadbed vibration response three-dimensional computational models and railway roadbed temperature-field three-dimensional computational models (as shown in a figure 2) in a parameterized manner; inputting loads; introducing temperature-field computational results as initial-field variables; analyzing roadbed vibration response of the railway roadbeds in the seasonally frozen ground regions in different seasons and under different train loads. The railway roadbed vibration response three-dimensional computational models comprise sleepers, ballast beds, roadbeds and fields, and phase change is taken into consideration in the railway roadbed temperature-field three-dimensional computational models. The inputted loads are time intervals of acting force of the sleepers of trains. The method has the advantage that the method is favorable for further improving a plurality of technical details, design specifications, construction regulations, maintenance standards and the like of current Chinese railway specifications for designs of the roadbeds in the seasonally frozen regions.

Description

technical field [0001] The invention relates to a three-dimensional numerical model of the vibration response of a railway subgrade in a seasonally frozen soil area caused by train running, and relates to a computer parameterized modeling method. Background technique [0002] As the world's third largest country with frozen soil, China's seasonally frozen soil covers an area of ​​5.14 million square kilometers, of which the area of ​​alpine and deep seasonal frozen soil with a freezing depth exceeding 1m and which has a serious impact on engineering is 3.67 million square kilometers, mainly distributed in Northeast China and Inner Mongolia. Most areas and parts of Xinjiang, Qinghai, and Tibet. According to the medium- and long-term plan for national railway development, various main-line railways, branch-line railways, and local railways in my country are mainly built in areas of seasonally frozen soil, and very few main railway lines are located in areas where permafrost an...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for establishing a three-dimensional numerical model of the vibration response of the railway subgrade in seasonally frozen soil regions based on the parameterization of python annotations, so as to solve the problem that the current finite element modeling is mainly carried out through manual GUI operation, and the infinite element boundary construction of the railway subgrade Modeling involves sweeping directionality of infinite elements, which brings huge workload and low efficiency to manual modeling

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