A quick-assessment procedure to evaluate the degree of conservation of rockfall drapery meshes

Marchelli, Maddalena; Biagi, Valerio De; Peila, Daniele

doi:10.3221/igf-esis.47.34

Cited by 16 publications

(8 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For this purpose, based on the outcomes of past studies reported in the literature [20,21,23,98], and in-situ observations, different types of damages have been identified and classified into several groups related to: (i) surrounding context (i.e., connected with vegetation, variation in time of morphology); (ii) design, positioning and installation techniques; (iii) post-impact conditions (in the hypothesis that no maintenance is performed after the impact); (iv) aging, weathering, wearing and corrosion (in the hypothesis that no maintenance procedure is performed); and (v) incorrect maintenance procedures.…”

Section: Risk Management and Conservation Assessment Of Protection Dementioning

confidence: 99%

“…Then, starting from the initial hypothesis that at the beginning of its working life the protection system has its maximum efficiency, i.e. assuming that it has been properly designed and positioned, a procedure able to evaluate the degree of degradation and to assess the state of conservation of both rockfall net fences and drapery mesh systems has been developed [98]. The method is based on a multi-criteria analysis, involving screening survey and providing a semi-quantitative value of the degree of conservation showing if the effectiveness is compromised, even though a complete assessment of the efficiency loss is far to be found.…”

Section: Risk Management and Conservation Assessment Of Protection Dementioning

confidence: 99%

See 1 more Smart Citation

Evaluating Rockfall Risk: Some Critical Aspects

et al. 2020

Self Cite

View full text Add to dashboard Cite

Rockfalls evolve rapidly and unpredictably in mountain environments and can cause considerable losses to human societies, structures, economical activities, and also natural and historical heritage. Rockfall risk analyses are complex and multi-scale processes involving several disciplines and techniques. This complexity is due to the main features of rockfall phenomena, which are extremely variable over space and time. Today, a considerable number of methods exists for protecting land, as well as assessing and managing the risk level. These methodologies are often very different from each other, depending on the data required, the purposes of the analysis, and the reference scale adopted, i.e., the analysis level of detail. Nevertheless, several questions still remain open with reference to each phase of the hazard and risk process. This paper is devoted to a general overview of existing risk estimation methodologies and a critical analysis of some open questions with the aim of highlighting possible further research topics. A typical risk assessment framework is exemplified by analyzing a real case study. Each step of the process is treated at both the detailed and the large scale in order to highlight the main characteristics of each level of detail.

show abstract

Section: Risk Management and Conservation Assessment Of Protection Dementioning

confidence: 99%

Section: Risk Management and Conservation Assessment Of Protection Dementioning

confidence: 99%

Evaluating Rockfall Risk: Some Critical Aspects

et al. 2020

Self Cite

View full text Add to dashboard Cite

show abstract

“…In addition, due to their environmental exposure, net fences require a constant monitoring and maintenance, to guarantee their effectiveness and efficiency in time (Luciani et al 2018;Marchelli 2020;Jaccard et al 2020). A periodic inspection to assess the degree of conservation is thus suggested .…”

Section: Introductionmentioning

confidence: 99%

Multiple Lines of Rockfall Net Fences: A Design Proposal of the System

Marchelli

2022

Rock Mech Rock Eng

Self Cite

View full text Add to dashboard Cite

Net fences constitute a valuable and widely adopted solution for mitigating rockfall risk. Nevertheless, in complex morphological situation with several rocky cliffs, a single line cannot be effective, and a double line of net fences is thus often required. At present, the existing design procedure has been conceived for a single line, only. In the present work, a design procedure for double line of net fences is introduced, considering the double line as a system, in which the upslope line stops, or at least decelerates, the great majority of the blocks, while the downslope line stops the remaining part. As a system, the effects of actions and resistances should be evaluated as a whole. The integrative trajectory analyses are required to optimise the design in terms of necessary energy absorption capacity, height of the lines, and maintenance planning. This system is suitable for mitigating rockfall risk, especially in very complex situations.

show abstract

“…Infrastructure damage has been investigated (Bunce et al 1997;Budetta 2004;Mignelli et al 2012;Macciotta et al 2016;Mineo 2020). Passive protection structures such as embankments and fences are widely used to protect the infrastructure downhill of steep slopes (Ronco et al 2009;Peila and Ronco 2009;Marchelli et al 2019). Fences have been designed to intercept and withstand the impact of blocks, which are referred to as functional and structural designs, respectively (De Biagi et al 2020;Marchelli et al 2020).…”

Section: Introductionmentioning

confidence: 99%

Risk mitigation for rockfall hazards in steeply dipping coal seam: a case study in Xinjiang, northwestern China

Wang

et al. 2021

Geomatics, Natural Hazards and Risk

View full text Add to dashboard Cite

Many recent examples have shown that rockfalls can occur in underground steep coal mines. The stratigraphic circumstances, block formation mechanism, and cumulative damage effects of rockfalls in the longwalls of a steeply dipping coal seam (SDCS) make them detrimental to workplace safety. Therefore, this study examined an approach for mitigating rockfall hazards in SDCSs. A passive mesh system was installed to prevent the propagation of rockfalls, which decreased the number of collisions between the falling rocks and mining equipment. The interactions of the falling rocks and passive mesh were studied using a series of full-scale numerical impact tests. The following conclusions could be drawn. The displacement of the mesh increased with the rockfall kinetic energy, showing the characteristic of strain hardening. The peak stress appeared near the contact area between the rockfall and mesh, and it spread to the mesh edge in an X-shaped pattern. Stress concentrations were likely to occur in areas that were in direct contact with the mesh and mesh edges. The displacement of the mesh increased when the incidence angle increased, and the number of mesh cells entering the plastic state increased significantly. The internal energy ratio increased with an increase in the incidence angle, indicating that a greater incidence angle led to a larger amount of kinetic energy being transferred from the block into the internal energy of the passive mesh. Finally, the method was verified by comparing the numerical test with the on-site damaged equipment. The high replacement frequency of a passive mesh system and the annual fatality rate in the longwalls of SDCS were significantly improved. This study provided the design for a drapery mesh system for rockfall disaster prevention, particularly the mitigation of rockfall hazard risks in underground SDCSs.

show abstract

A quick-assessment procedure to evaluate the degree of conservation of rockfall drapery meshes

Cited by 16 publications

References 19 publications

Evaluating Rockfall Risk: Some Critical Aspects

Evaluating Rockfall Risk: Some Critical Aspects

Multiple Lines of Rockfall Net Fences: A Design Proposal of the System

Risk mitigation for rockfall hazards in steeply dipping coal seam: a case study in Xinjiang, northwestern China

Contact Info

Product

Resources

About