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3D Stress–Strain Analysis of a Failed Limestone Wedge Influenced by an Intact Rock Bridge

Paronuzzi P.
•
Bolla A.
•
Rigo E.
2016
  • journal article

Periodico
ROCK MECHANICS AND ROCK ENGINEERING
Abstract
This paper presents a back-analysis of a rock wedge failure (volume = 25–30 m3) that involved a limestone scarp in the Rosandra valley (Trieste karst, NE Italy). Thanks to the mechanical survey of the detachment surface, a single rock bridge having a size of about 15 cm × 30 cm has been ascertained. A 3D stress–strain analysis has been performed to examine the influence of the rock bridge on the block stability (initial unweathered condition: strength reduction factor SRF equal to 1.14). The shear strength provided by the basal and lateral joints represents the main contributing factor for the wedge stability (about 60–75 % of the whole resisting system). However, the equilibrium of the wedge was temporarily attained thanks to the strength contribution provided by the rock bridge (25–40 %) until the acting forces locally exceeded the resisting forces, thus determining the bridge rupture and, as a consequence, the wedge collapse. The mean shear stress acting on the rock bridge at failure ranges from about 3.5 to 5 MPa. Calculated block displacements up to failure vary from 0.6 to 1.5 mm, depending on the different elastic modulus assumed for the wedge (E = 30, 10, and 4 GPa). Pre-collapse block displacements increase as a result of the shear strength decrease that was initially caused by the weathering of the delimiting rock joints and, further, by the progressive failure of the rock bridge. The cohesion at failure of the rock bridge ranges from 2.1 to 2.6 MPa (friction angle of intact rock φ = 40°). © 2016, Springer-Verlag Wien.
DOI
10.1007/s00603-016-0963-7
WOS
WOS:000381218100017
Archivio
http://hdl.handle.net/11390/1127092
info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84962671671
https://link.springer.com/article/10.1007%2Fs00603-016-0963-7
Diritti
closed access
Soggetti
  • Slope stability, Roc...

Web of Science© citazioni
28
Data di acquisizione
Mar 27, 2024
Visualizzazioni
3
Data di acquisizione
Apr 19, 2024
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