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Dynamic track-soil interaction——calculations and measurements of slab and ballast tracks

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2021年第1期22卷 21-36页

作者： lutz auersch Samir SAID Federal Institute of Material Research and Testing Berlin 12200Germany

The dynamic behaviour of slab and ballast tracks was investigated using measurements and *** impacts and train passages were analysed and measurements were made using geophones(velocity transducers)which had been time-integrated to *** calculations were carried out in the frequency-wavenumber domain for multi-beamon-continuous soil *** characteristics of the different tracks and track elements were established in theory and by *** frequency-dependent compliances(displacement transfer functions)showed clear rail-on-railpad resonances or highly damped track-soil *** to the rail and sleeper,the track slab had much lower *** slab track usually had the highest rail amplitudes due to soft *** passage yielded track displacements which were a superposition of the axle loads from the two neighbouring axles of a bogie and from the two bogies of two neighbouring *** global behaviour was characteristic of the track slab of the slab track,whereas the rails of the slab and the ballast tracks behaved more locally with only one bogie of *** measurements agreed very well with the theory of continuous soil in the case of the six measured slab tracks and acceptably well for the six measured ballast *** measurements allowed us to find appropriate model parameters and to check the *** example,the Winkler model of the soil was found to be less appropriate because it reacted more locally.

关键词： Slab track Ballast track Train passage Hammer impact Track-soil interaction

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Simple and fast prediction of train-induced track forces,ground and building vibrations

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Railway Engineering Science 2020年第3期28卷 232-250页

作者： lutz auersch Federal Institute of Materials Research and Testing D-12200 BerlinGermany

A simple and fast prediction scheme is presented for train-induced ground and building *** models such as(one-dimensional)transfer matrices are used for the vehicle–track–soil interaction and for the building–soil *** wave propagation through layered soils is approximated by a frequency-dependent homogeneous *** prediction is divided into the parts“emission”(excitation by railway traffic),“transmission”(wave propagation through the soil)and“immission”(transfer into a building).The link between the modules is made by the excitation force between emission and transmission,and by the free-field vibration between transmission and *** formula for the simple vehicle–track,soil and building models are given in this *** behaviour of the models is demonstrated by typical examples,including the mitigation of train vibrations by elastic track elements,the low-and high-frequency cut-offs characteristic for layered soils,and the interacting soil,wall and floor resonances of multi-storey *** is shown that the results of the simple prediction models can well represent the behaviour of the more time-consuming detailed models,the finite-element boundary-element models of the track,the wavenumber integrals for the soil and the three-dimensional finite-element models of the *** addition,measurement examples are given for each part of the prediction,confirming that the methods provide reasonable *** the prediction models are fast in calculation,many predictions can be done,for example to assess the environmental effect along a new railway *** simple models have the additional advantage that the user needs to know only a minimum of ***,the prediction is fast and user-friendly,but also theoretically and experimentally well-founded.

关键词： Railway-induced vibration Ground vibration Layered soil Building response Excitation forces Track and vehicle irregularities

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Attenuation of ground vibrations due to different technical sources

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Earthquake Engineering and Engineering Vibration 2010年第3期9卷 337-344页

作者： L.auersch S.Said Federal Institute of Material Research and Testing

The attenuation of technically induced surface waves is studied theoretically and experimentally. In this paper, nineteen measurements of ground vibrations induced by eight different technical sources including road and rail traffic, vibratory and impulsive construction work or pile driving, explosions, hammer impulses and mass drops are described, and it is shown that the technically induced ground vibrations exhibit a power-law attenuation v - r ~ where the exponents q are in the range of 0.5 to 2.0 and depend on the source types. Comparisons performed demonstrate that the measured exponents are considerably higher than theoretically expected. Some potential effects on ground vibration attenuation are theoretically analyzed. The most important effect is due to the material or scattering damping. Each frequency component is attenuated exponentially as exp（-kr）, but for a broad-band excitation, the sum of the exponential laws also yields a power law but with a high exponent. Additional effects are discussed, for example the dispersion of the Rayleigh wave due to soil layering, which yields an additional exponent of 0.5 in cases of impulsive loading.

关键词： wave attenuation environmental vibrations field tests material damping scattering damping Rayleigh wave

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