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@article{57381, author = {Opršal, Ivo and Thun, Johannes and Burjanek, Jan and Faeh, Donat}, article_location = {Amsterdam}, article_number = {January}, doi = {http://dx.doi.org/10.1016/j.enggeo.2020.105919}, keywords = {Rock slope instability; Finite difference modeling; Directional deformations; Micro deformations; Micro tilt; Data mining}, language = {eng}, issn = {0013-7952}, journal = {Engineering Geology}, title = {Measurements and modeling of the post-failure micro-deformations and tilts of the Preonzo unstable slope, Alpe di Roscioro, Switzerland}, url = {https://www.sciencedirect.com/science/article/pii/S0013795220318160?via%3Dihub}, volume = {280}, year = {2021} }
TY - JOUR ID - 57381 AU - Opršal, Ivo - Thun, Johannes - Burjanek, Jan - Faeh, Donat PY - 2021 TI - Measurements and modeling of the post-failure micro-deformations and tilts of the Preonzo unstable slope, Alpe di Roscioro, Switzerland JF - Engineering Geology VL - 280 IS - January SP - 1-12 EP - 1-12 PB - Elsevier SN - 00137952 KW - Rock slope instability KW - Finite difference modeling KW - Directional deformations KW - Micro deformations KW - Micro tilt KW - Data mining UR - https://www.sciencedirect.com/science/article/pii/S0013795220318160?via%3Dihub N2 - 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. ER -
OPRŠAL, Ivo, Johannes THUN, Jan BURJANEK a Donat FAEH. Measurements and modeling of the post-failure micro-deformations and tilts of the Preonzo unstable slope, Alpe di Roscioro, Switzerland. \textit{Engineering Geology}. Amsterdam: Elsevier, 2021, roč.~280, January, s.~1-12. ISSN~0013-7952. Dostupné z: https://dx.doi.org/10.1016/j.enggeo.2020.105919.
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