For the design of rockfall protection systems, please suggest a method to calculate the volume of unstable rock debris within a single mesh panel and the maximum theoretical debris that could be held by the mesh.
Potential unstable volumes depend on geostructural pattern and slope geometry. In case of debris (I suppose you mean heavily fractured rock mass), it is relevant to establish the thickness of de-stressed zone, then it becomes a matter of geometrical evaluation.
The focus should be pointed on the anchoring system of bolts supporting mesh panels and eventual reinforcing cables: the length of the anchor zone is fundamental to maintain the stability of the overall system.
Finally you should consider the strength of the panel adopted.
I can suggest a couple of papers for reference
- Full scale testing of draped nets for rock fall protection, by Bertolo, Oggeri and Peila, in Can. Geotech. J, 46: 306-317 (2009).
and
_ Contributo al dimensionamento delle reti in aderenza per la protezione di distacchi rocciosi, by Peila, Barbero and Oggeri, in XXV Nat. Conf. of Geotechnics, AGI ( 2014) . This is in Italian but the flow chart containing the design procedure is graphical and can be undestood easily.
Regards and good luck
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