Geotechnical and kinematic parameters affecting the coefficients of restitution for rock fall analysis

Asteriou, Pavlos; Saroglou, H.; Tsiambaos, G.

doi:10.1016/j.ijrmms.2012.05.029

Cited by 129 publications

(74 citation statements)

References 13 publications

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“…Thus, impact velocity should be greater, which is possible if the launch velocity of the previous impact was higher than the assumed minimum. For the cases where V cor < 1, it is observed that kinematic COR ranges between 0.55 and 1.0 and presents smaller variation compared to the normal or tangential coefficient of restitution, similar to what was previously reported in the relevant literature (i.e., Asteriou et al, 2012;Asteriou and Tsiambaos, 2016).…”

Section: Coefficients Of Restitutionsupporting

confidence: 87%

“…12, the normal COR increases as the impact angle reduces, similarly to previous observations by Giacomini et al (2012), Asteriou et al (2012) and Wyllie (2014). The correlation proposed by Wyllie (2014) is also plotted in Fig.…”

Section: Coefficients Of Restitutionsupporting

confidence: 85%

“…Moreover, normal COR values higher than one were calculated in 11 out of the 15 remaining impacts. Normal CORs higher than one have been observed in both experimental (e.g., Spadari et al, 2011;Buzzi et al, 2012;Asteriou et al, 2012) and back-analysis studies (e.g., Paronuzzi, 2009) and are related to irregular block shape and slope roughness, as well as to shallow impact angle and angular motion. A more detailed presentation of the reasons why the normal COR exceeds unity can be found in Ferrari et al (2013).…”

Section: Coefficients Of Restitutionmentioning

confidence: 90%

See 2 more Smart Citations

UAV-based mapping, back analysis and trajectory modeling of a coseismic rockfall in Lefkada island, Greece

Saroglou

Asteriou

Zekkos

et al. 2018

Nat. Hazards Earth Syst. Sci.

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Abstract. We present field evidence and a kinematic study of a rock block mobilized in the Ponti area by a M w = 6.5 earthquake near the island of Lefkada on 17 November 2015. A detailed survey was conducted using an unmanned aerial vehicle (UAV) with an ultrahigh definition (UHD) camera, which produced a high-resolution orthophoto and a digital terrain model (DTM). The sequence of impact marks from the rock trajectory on the ground surface was identified from the orthophoto and field verified. Earthquake characteristics were used to estimate the acceleration of the rock slope and the initial condition of the detached block. Using the impact points from the measured rockfall trajectory, an analytical reconstruction of the trajectory was undertaken, which led to insights on the coefficients of restitution (CORs). The measured trajectory was compared with modeled rockfall trajectories using recommended parameters. However, the actual trajectory could not be accurately predicted, revealing limitations of existing rockfall analysis software used in engineering practice.

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Section: Coefficients Of Restitutionsupporting

confidence: 87%

Section: Coefficients Of Restitutionsupporting

confidence: 85%

Section: Coefficients Of Restitutionmentioning

confidence: 90%

See 1 more Smart Citation

UAV-based mapping, back analysis and trajectory modeling of a coseismic rockfall in Lefkada island, Greece

Saroglou

Asteriou

Zekkos

et al. 2018

Nat. Hazards Earth Syst. Sci.

View full text Add to dashboard Cite

show abstract

“…Kinematic COR values are less affected by the rebound angle. In general, the kinematic COR is more appropriate than the normal COR for use in correlations as it provides more consistent trends (Asteriou et al 2012).…”

Section: Effect Of Shapementioning

confidence: 99%

Empirical Model for Predicting Rockfall Trajectory Direction

Asteriou

Tsiambaos

2015

Rock Mech Rock Eng

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A methodology for the experimental investigation of rockfall in three-dimensional space is presented in this paper, aiming to assist on-going research of the complexity of a block's response to impact during a rockfall. An extended laboratory investigation was conducted, consisting of 590 tests with cubical and spherical blocks made of an artificial material. The effects of shape, slope angle and the deviation of the post-impact trajectory are examined as a function of the pre-impact trajectory direction. Additionally, an empirical model is proposed that estimates the deviation of the post-impact trajectory as a function of the pre-impact trajectory with respect to the slope surface and the slope angle. This empirical model is validated by 192 small-scale field tests, which are also presented in this paper. Some important aspects of the three-dimensional nature of rockfall phenomena are highlighted that have been hitherto neglected. The 3D space data provided in this study are suitable for the calibration and verification of rockfall analysis software that has become increasingly popular in design practice.

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“…Rockfall mass was determined by the statistical analysis method. The coefficients of restitution and friction are affected by slope shape, surface vegetation and block shape [35,36], which can be obtained by four methods including in situ tests [37], back analysis [38], theoretical estimation [39,40] and literature query [41]. Because of the impossibility to perform in situ tests and a lack of some historical events records for back analysis and theoretical estimation, the first three methods are not suitable for this study.…”

Section: Rockfall Simulationsmentioning

confidence: 99%

Analysis of Potential Rockfalls on a Highway at High Slopes in Cold-Arid Areas (Northwest Xinjiang, China)

Yang

Shang

et al. 2017

Sustainability

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Abstract:In the steep mountainous areas in northwest Xinjiang, where rock mass is broken seriously due to intense freeze thaw weathering, rockfall is one of the most common geological hazards on highway high slopes. Engineering geological investigations on geological hazards along a segment of the G219 highway was conducted, indicating that rockfalls on the high slopes threaten the safety of vehicles on the highway seriously. In this study, a combination of field investigations, laboratory experiments and numerical simulation methods was performed to identify unstable high slopes, simulate the rockfall trajectories and assess the rockfall hazard in the study area. The results show that there are five high slopes (i.e., W01, W02, . . . , W05) where rockfall hazard is extremely serious. Considering both the total kinetic energy and the accumulation rate of blocks, rockfall influence area zonation was performed, leading to the conclusions that the sections of highway on W01 to W05 are located at the medium-intensity low-accumulation zone, high-intensity medium-accumulation zone, high-intensity low-accumulation zone, high-intensity low-accumulation zone and medium-intensity high-accumulation zone, respectively. Based on the analysis, a zonation map was accomplished, which could help engineers select effective mitigation measures against rockfalls to avoid casualty and property losses.

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Geotechnical and kinematic parameters affecting the coefficients of restitution for rock fall analysis

Cited by 129 publications

References 13 publications

UAV-based mapping, back analysis and trajectory modeling of a coseismic rockfall in Lefkada island, Greece

UAV-based mapping, back analysis and trajectory modeling of a coseismic rockfall in Lefkada island, Greece

Empirical Model for Predicting Rockfall Trajectory Direction

Analysis of Potential Rockfalls on a Highway at High Slopes in Cold-Arid Areas (Northwest Xinjiang, China)

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