Chemo-mechanical behaviour of lightweight cemented soils     

Vitale  E.  Deneele  D.  Russo  G.  De Sarno  D.  Nicotera  M. V.  Papa  R.  Urciuoli  G. 《Acta Geotechnica》2020,15(4):933-945

Acta Geotechnica - In this paper, a multi-scale analysis of the effect of foam on chemo-mineralogical and microstructural features of the soil–cement–water system is presented....  相似文献   

Selecting time windows of seismic phases and noise for engineering seismology applications: a versatile methodology and algorithm     

Vincent Perron  Aurore Laurendeau  Fabrice Hollender  Pierre-Yves Bard  Céline Gélis  Paola Traversa  Stéphane Drouet 《Bulletin of Earthquake Engineering》2018,16(6):2211-2225

Seismic signal windowing is the preliminary step for many analysis procedures in engineering seismology (standard spectral ratio, quality factor, general inversion techniques, etc.). Moreover a noise window is often necessary for the data quality control through the signal-to-noise verification. Selecting the noise window can be challenging when large heterogeneous datasets are considered, especially when they include short pre-event noise signals. This study proposes a fully automatic and configurable (i.e., with default parameters that can also be user-defined) algorithm to windowing the noise and the P, S, coda and full signal once the P-wave (T _P ) and S-wave (T _S ) first arrivals are known. An application example is given on a KiK-net dataset. A Matlab language implementation of this algorithm is proposed as an online resource.  相似文献   

Key structural parameters affecting earthquake ground motion in 2D and 3D sedimentary structures     

Peter Moczo  Jozef Kristek  Pierre-Yves Bard  Svetlana Stripajová  Fabrice Hollender  Zuzana Chovanová  Miriam Kristeková  Deborah Sicilia 《Bulletin of Earthquake Engineering》2018,16(6):2421-2450

Alluvial valleys generate strong effects on earthquake ground motion (EGM). These effects are rarely accounted for even in site-specific studies because of (a) the cost of the required geophysical surveys to constrain the site model, (b) lack of data for empirical prediction, and (c) poor knowledge of the key controlling parameters. We performed 3D, 2D and 1D simulations for six typical sedimentary valleys of various width and depth, and for a variety of modifications of these 6 “nominal models” to investigate sensitivity of EGM characteristics to impedance contrast, attenuation, velocity gradient and geometry. We calculated amplification factors, and 2D/1D and 3D/2D aggravation factors for 10 EGM characteristics, using a representative set of recorded accelerograms to account for input motion variability. The largest values of the amplification and aggravation factors are found for the Arias intensity and cumulative absolute velocity, the lowest for the root-mean-square acceleration. The aggravation factors are largest for the vertical component. For each model, at least one EGM characteristic exhibits a significant 2D/1D aggravation factor, while all EGM characteristics exhibit significant 2D/1D aggravation factor on the vertical component. For all investigated sites, there is always an area in the valley for which 1D estimates are not sufficient. 2D estimates are insufficient at several sites. The key structural parameters are the shape ratio and overall geometry of the sediment-bedrock interface, impedance contrast at the sediment-bedrock interface, and attenuation in sediments. The amplification factors may largely exceed the values that are usually considered in GMPEs between soft soils and rock sites.  相似文献   

Correction to: The probabilistic seismic hazard assessment of Germany—version 2016, considering the range of epistemic uncertainties and aleatory variability     

Gottfried Grünthal  Dietrich Stromeyer  Christian Bosse  Fabrice Cotton  Dino Bindi 《Bulletin of Earthquake Engineering》2018,16(10):4397-4398

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