Analysis of Rockfall Hazards Based on the Effect of Rock Size and Shape

Nagendran, Sharan Kumar

doi:10.1007/s40999-019-00418-1

Cited by 35 publications

(6 citation statements)

References 16 publications

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“…On the basis of the above-described observations, our findings are consistent with several literature works, real case observations and experimental activities [10,30,[36][37][38][39]. With reference to the lateral angle , the 98th percentile of the CDF was considered as a reference value in order to maximize the lateral dispersion of the trajectories.…”

supporting

confidence: 89%

Preliminary Modeling of Rockfall Runout: Definition of the Input Parameters for the QGIS Plugin QPROTO

2021

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The identification of the most rockfall-prone areas is the first step of the risk assessment procedure. In the case of land and urban planning, hazard and risk analyses involve large portions of territory, and thus, preliminary methods are preferred to define specific zones where more detailed computations are needed. To reach this goal, the QGIS-based plugin QPROTO was developed, able to quantitatively compute rockfall time-independent hazard over a three-dimensional topography on the basis of the Cone Method. This is obtained by combining kinetic energy, passing frequency and detachment propensity of each rockfall source. QPROTO requires the definition of few angles (i.e., the energy angle and the lateral angle ) that should take into account all the phenomena occurring during the complex block movement along the slope. The outputs of the plugin are a series of raster maps reporting the invasion zones and the quantification of both the susceptibility and the hazard. In this paper, a method to relate these angles to some characteristics of the block (volume and shape) and the slope (inclination, forest density) is proposed, to provide QPROTO users with a tool for estimating the input parameters. The results are validated on a series of case studies belonging to the north-western Italian Alps.

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supporting

confidence: 89%

Preliminary Modeling of Rockfall Runout: Definition of the Input Parameters for the QGIS Plugin QPROTO

2021

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“…The run-out of rockfall is a probabilistic and random process due to the uncertainties in the mechanical parameters of the real surface. Several parameters are essential for simulating the rockfall movement, such as the shapes, volumes and masses of the rock blocks, the angle and aspect of the slope, the normal and tangential restitution coefficients (R N and R T ) and the dynamic friction angle (f) of the soil (Lan et al 2007;Volkwein et al 2011;Olmedo et al 2015;Ferrari et al 2016;Marchelli and De Biagi 2019;Nagendran and Ismail 2019).…”

Section: Rockfall Characteristics and Simulationmentioning

confidence: 99%

“…Third, it has a narrow foundation and can be adapted to steep and narrow slopes. Finally, it is easy to maintain, disassemble and reinstall (Nagendran and Ismail 2019). A flexible protection system is divided into an active protection system and passive protection system.…”

Section: Measures To Mitigate Rockfall Hazardmentioning

confidence: 99%

Quantitative hazard assessment of rockfall and optimization strategy for protection systems of the Huashiya cliff, southwest China

Jiang

Liu

et al. 2020

Geomatics, Natural Hazards and Risk

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Frequent rockfall events at the Huashiya cliff near the dam site of Jinsha Hydropower Station poses great threats to construction projects along the Jinsha River. In order to protect the construction area, a comprehensive analysis of rockfall hazard was carried out including field survey, numerical simulation, quantitative assessment and mitigation strategy. High resolution Digital Terrain Model (DTM) was created by Terrestrial Laser Scanning (TLS), then used for the identification of rockfall sources and simulation of rockfall run-out behaviours. Approximately 60 rockfall simulations were conducted to analyze the interaction between rockfall block and protection nets. Quantitative assessment of rockfall hazard was then made to visualize the distribution and hazard of rockfall. The difference between the 60 rockfall simulations was quantified through Rockfall Interception Ratio (RIR) and the Energy Ratio of Overflying Rockfall (EROR). By integrating RIR, EROR and cost, the performance of protection measures were quantitatively assessed. Then, an optimization strategy was proposed to improve the cost-efficiency of the protection system. At the end of this paper, some problems that can be encountered when creating DTM and hazard maps were discussed, and some advices for designing passive protection system were introduced.

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“…It can be said that the kinetic energy and motion trajectory are the main basis for determining the strength as well as the location and scale of rockfall protection structures. Thus, many methods, such as analytical calculations (Azzoni et al 1995;Zambrano 2008;Irfan and Chen 2017), laboratory model tests (Asteriou et al 2012;Asteriou and Tsiambaos 2016;Nagendran and Ismail 2019), field experiments (Giacomini et al 2009;Ma et al 2011;Spadari et al 2012), and numerical simulations (Stevens 1998;Jones et al 2000;Guzzetti et al 2002), have been used to study the movement characteristics of rockfalls. However, only a few studies have analysed the failure mechanisms and dynamic characteristics during the initial failure phase of rockfalls.…”

Section: Introductionmentioning

confidence: 99%

Three-Dimensional Discontinuous Deformation Analysis of Failure Mechanisms and Movement Characteristics of Slope Rockfalls

Liu

2021

Rock Mech Rock Eng

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A rockfall is a typical dynamic problem of a discontinuous block system originating from a dangerous rock mass and always presents serious geo-hazards along highway slopes in mountainous areas. This study aims to investigate the failure mechanisms and movement characteristics of rockfalls through a three-dimensional discontinuous deformation analysis (3D DDA) method and attempts to comprehensively examine the complicated kinematic process of rockfall disasters. In terms of the initial failure and post-movement characteristics (i.e., motion trajectory and kinetic energy) of a rockfall, the effectiveness of 3D DDA is verified by comparing its results with those of laboratory experiments. Taking the K4580 typical high-steep slope undergoing rockfalls along the G318 national highway in Tibet as an example, the initiation and failure of a single boulder and a large-scale rock mass at the source area were simulated by 3D DDA. Then, the movement characteristics of the boulder and massive collapsing rocks along the slopes of different geometrical characteristics, i.e., the slopes before the landslide and after the shallow and deep landslides, were studied. The results show that the 3D DDA has significant advantages in analysing the failure mechanisms of slope rockfalls and can satisfactorily simulate the spatial movement (e.g., lateral deviation and deflection) of blocks by considering the 3D geometry of the slopes and blocks. The 3D DDA numerical simulation can predict the movement range, deposition position, and affected area of rockfall disasters, which can provide a basis for formulating disaster prevention countermeasures in actual projects.

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Analysis of Rockfall Hazards Based on the Effect of Rock Size and Shape

Cited by 35 publications

References 16 publications

Preliminary Modeling of Rockfall Runout: Definition of the Input Parameters for the QGIS Plugin QPROTO

Preliminary Modeling of Rockfall Runout: Definition of the Input Parameters for the QGIS Plugin QPROTO

Quantitative hazard assessment of rockfall and optimization strategy for protection systems of the Huashiya cliff, southwest China

Three-Dimensional Discontinuous Deformation Analysis of Failure Mechanisms and Movement Characteristics of Slope Rockfalls

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