Počet záznamů: 1
Measurements and modeling of the post-failure micro-deformations and tilts of the Preonzo unstable slope, Alpe di Roscioro, Switzerland
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SYSNO ASEP 0542058 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Measurements and modeling of the post-failure micro-deformations and tilts of the Preonzo unstable slope, Alpe di Roscioro, Switzerland Tvůrce(i) Opršal, Ivo (GFU-E) ORCID, RID
Thun, Johannes (GFU-E) ORCID
Burjánek, Jan (GFU-E) ORCID, RID
Fäh, D. (CH)Číslo článku 105919 Zdroj.dok. Engineering Geology. - : Elsevier - ISSN 0013-7952
Roč. 280, January (2021)Poč.str. 14 s. Forma vydání Tištěná - P Jazyk dok. eng - angličtina Země vyd. NL - Nizozemsko Klíč. slova rock slope instability ; finite difference modeling ; directional deformations ; micro deformations ; micro tilt ; data mining Vědní obor RIV DC - Seismologie, vulkanologie a struktura Země Obor OECD Volcanology Způsob publikování Open access Institucionální podpora GFU-E - RVO:67985530 UT WOS 000615526300010 EID SCOPUS 85097090130 DOI 10.1016/j.enggeo.2020.105919 Anotace The Alpe di Roscioro, is a site of an unstable rock slope located above the village of Preonzo in southern Switzerland. There have been numerous rock-slope failures with a major event that happened in May 2012. After that event, several seismic stations were set up at the site of the remaining highly fractured and unstable rock mass. The analysis of continuous seismic recordings has shown a high number of permanent micro-deformations and tilts, recorded by a seismometer located on top of the unstable part of the slope. In terms of the ground motion, the directions of these disturbances are parallel to the mean strike of the mapped fracture network, implying a connection to the ongoing deformations of the rock mass. The static deformation field of the fractured rock mass is modeled by finite-difference method (FD). The FD method enables us to apply a reciprocal approach by tilting the affected body of block 1, closest to the stable massif, by measured values and observing the deformations below the seismometer and in the neighboring blocks. The numerical model explains the following features observed in situ: feature 1. The combination of the horizontal displacement and tilt observed approximately at the same measurement point, feature 2. The block 1 center of rotation is shifted towards SSE by similar to 10 m off its center, feature 3. The sensors placed on the stable massif did not record any micro-deformation and tilt signals above the background noise. In the light of the numerical modeling, the weak coupling between the micro-tilt active block 1 and neighboring media explains the absence of detected events in the reference stations placed on the stable massif. The simplified shear and bending force system FD model, indicates that the aftermath of the May 2012 main failure consisted of numerous episodic elementary relaxations of the SSE part of block 1 after the collapse of its NNW compartment, which was previously connected to it. Pracoviště Geofyzikální ústav Kontakt Hana Krejzlíková, kniha@ig.cas.cz, Tel.: 267 103 028 Rok sběru 2022 Elektronická adresa https://www.sciencedirect.com/science/article/pii/S0013795220318160
Počet záznamů: 1