On the Use and Interpretation of In Situ Load Tests in Weak Rock Masses

2021 ◽  
Author(s):  
Pouyan Asem ◽  
Paolo Gardoni
Keyword(s):  
Weak Rock ◽  
Rock Masses ◽  
Load Tests ◽  
Weak Rock Masses

Development of a Highly Portable Plate Loading Device and In Situ Modulus Measurements in Weak Rock Masses

2015 ◽  
Vol 49 (2) ◽  
pp. 443-454 ◽  
Author(s):  
Raj R. Kallu ◽  
Evan R. Keffeler ◽  
Robert J. Watters ◽  
Sean N. Warren
Keyword(s):  
Weak Rock ◽  
Rock Masses ◽  
Loading Device ◽  
Weak Rock Masses ◽  
Plate Loading

Tunnel behaviour associated with the weak Alpine rock masses of the Driskos Twin Tunnel system, Egnatia Odos Highway

2013 ◽  
Vol 50 (1) ◽  
pp. 91-120 ◽  
Author(s):  
N. Vlachopoulos ◽  
M.S. Diederichs ◽  
V. Marinos ◽  
P. Marinos
Keyword(s):  
Numerical Models ◽  
Three Dimensional ◽  
Monitoring Data ◽  
Tunnel Construction ◽  
Weak Rock ◽  
Rock Masses ◽  
Tunnel Excavation ◽  
Twin Tunnel ◽  
Geological Conditions ◽  
Weak Rock Masses

Based on the excessive deformations and support failure encountered during tunnel construction at the Driskos Twin Tunnel site in Northern Greece, this paper provides insight on how tunnels designed in such weak rock environments can be realistically analyzed with a view of determining better analytical tools to predict deformations and improving current design methods. Specific factors that were assessed include rock strength based on the geological strength index (GSI), tunnel deformation, numerical analysis techniques employed, three-dimensional model type, support considerations, dilation, sequencing of tunnel excavation, influence of single bore construction on twin bore, and homogenization of tunnel faces. This work involves the use of nominally identical two- and three-dimensional numerical models of tunnel sequencing for analytical simulation of weak material behaviour and sequential tunnel deformation response with the goal of investigating the strength and deformation of such weak rock masses. These have been used in combination with monitoring data that were obtained in the field during the Driskos Twin Tunnel construction. A discussion of the geological conditions, material property determination, monitoring data, and model calibration strategy is given. This paper provides insight into these issues and poses many more fundamental questions regarding the analysis of tunnel excavation within weak rock masses requiring further investigation.

Empirical approaches for opening design in weak rock masses

2005 ◽  
Vol 114 (1) ◽  
pp. 13-20 ◽  
Author(s):  
Tom Brady ◽  
Lewis Martin ◽  
Rimas Pakalnis
Keyword(s):  
Weak Rock ◽  
Rock Masses ◽  
Weak Rock Masses ◽  
Empirical Approaches
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