Abstract
The evaluation of the parameters of multi-layered foundations (railroad basis, foundations of railway structures, etc.) plays an important role in ensuring the safe movement of trains. The method of estimating the mechanical and geometric parameters of such foundations based on the solutions of inverse problems for multi-layered elastic packets is proposed. As input data for such problems the measured displacements of certain points on the package surface are used. The method allows estimating the parameters of the a priori distribution of unknown variable parameters, identifying and excluding outliers of the measured data from the created model, and constructing a posteriori estimation of the unknown parameters probability density with acceptable resolution. Proposed method can be used to create a new generation of equipment intended for non-destructive monitoring and estimating of the condition of the railroad basis and the foundations of artificial structures. The appropriate software of such vehicles based on the developed methods of data processing can be developed. The use of such equipment allows to operatively analyzing the state of individual areas of the railroad to decide on the need of repairing or replacing the railroad base or foundation of other elements of railroad infrastructure.
Highlights
The issues of non-destructive monitoring and control of the mechanical and geometrical parameters of the roadbed are of great importance in the practice of safe railways operation
The uncertainty of the train movement process over long distances greatly complicates the transportation planning and ensuring traffic safety. This is due to factors associated with the risks in the process of organizing the movement of trains, when it is necessary to ensure high reliability of all railway subsystems, in particular infrastructure subsystems
It is known that the consequences of train derailments caused by the collapse of railway embankments often exceed the consequences of accidents caused by the destruction of the rail track itself [2]
Summary
The main goal of this work is to develop methods for analyzing data from scanning devices designed to determine the surface points displacement velocities of the loaded railway bed, which helps to recognize the weakness of the roadbed structures and prevent unallowable deformations and destruction of the it and, increase the safety of train traffic. The disadvantage of such tools is that they must be equipped with a complex system of precise positioning of rangefinder sensors, as well as a speed integrator to determine accurately the time intervals between fixing the results of two adjacent displacement sensors at the same point of the investigated surface Another significant problem is the vibration of the mounting base of optical sensors, the amplitude of which can significantly (sometimes by several orders of magnitude) exceed the values of the measured displacements. Data processing supplied by the considered tools is based on certain models of layered foundations, discussed below
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