Effect of normal load on shear behavior and acoustic emissions of rock joints under direct shear loading

2010 ◽  
pp. 239-242
Keyword(s):  
Normal Load ◽  
Acoustic Emissions ◽  
Shear Behavior ◽  
Shear Loading ◽  
Rock Joints ◽  
Direct Shear

Application of acoustic emission for monitoring shear behavior of bonded concrete–rock joints under direct shear test

2012 ◽  
Vol 39 (8) ◽  
pp. 887-896 ◽  
Author(s):  
Z.A. Moradian ◽  
G. Ballivy ◽  
P. Rivard
Keyword(s):  
Acoustic Emission ◽  
Shear Strength ◽  
Normal Load ◽  
Adhesive Bond ◽  
Shear Behavior ◽  
Displacement Rate ◽  
Bond Breaking ◽  
Bonded Joints ◽  
Direct Shear ◽  
Shear Process

Studying shear behavior and failure mechanism of concrete–rock interfaces between concrete structures and rock mass is highly important. To this end, laboratory direct shear tests were conducted on several bonded interfaces. The effect of normal stress, displacement rate, and bonding percentage on shear behavior of bonded joints were also evaluated. The results showed that the adhesive bond between concrete and rock has the most important effect on shear mechanism of concrete–rock interfaces. When the normal load is low, the asperities do not contribute in shear process, so the shear strength of the joints is governed by adhesive bond. The only contribution of the asperities is that they show a small peak after bond breaking peak. When the normal load is high, the asperities break simultaneously with adhesive bond and they show their contribution in the whole shear process. In a constant normal load, by decreasing bonding percentage, the brittle failure of the bonded joints is changed into softening failure because of less contribution of the adhesive bond and more contribution of the rough asperities in joint failure. Acoustic emission (AE) monitoring of bonded joints showed that for all different tested samples under various loading conditions, there has been no or very few AE activities before adhesive bond breaking point, indicating that other parameters (roughness, normal load, displacement rate) are impressed by adhesive bond and maximum shear strength is determined by this parameter.

scholarly journals Simulation of direct shear tests using a forces on fracture surfaces (FFS) approach

2021 ◽  
Vol 80 (8) ◽  
Author(s):  
Thomas Frühwirt ◽  
Daniel Pötschke ◽  
Heinz Konietzky
Keyword(s):  
Normal Load ◽  
Crystalline Rock ◽  
Rock Joints ◽  
Direct Shear ◽  
Shear Tests ◽  
Data Set ◽  
Direct Shear Tests ◽  
Complex Process ◽  
Shear Characteristics ◽  
Constant Normal Stiffness

AbstractThe aim of this work is to provide a complete data set of direct shear tests and to propose a corresponding simulation approach. Tests have been conducted on crystalline rock samples applying constant normal load (CNL) and constant normal stiffness (CNS) boundary conditions. A physical consistent algorithm which explicitly calculates the forces acting on the fracture surface (FFS) has been developed. This FFS approach can explain the occurrence of surface degradation and shows the main shear characteristics. After all, shearing of rough rock joints remains a complex process and the differences between laboratory and simulation results are still significant in some cases. All data and input files are provided free for download and testing.

Direct shear behavior of a plane joint under dynamic normal load (DNL) conditions

2016 ◽  
Vol 213 ◽  
pp. 133-141 ◽  
Author(s):  
Wengang Dang ◽  
Heinz Konietzky ◽  
Thomas Frühwirt
Keyword(s):  
Normal Load ◽  
Shear Behavior ◽  
Direct Shear ◽  
Plane Joint

Study of shear behavior of grouted vertical joints between precast concrete wall panels under direct shear loading

2018 ◽  
Vol 20 (2) ◽  
pp. 564-582 ◽  
Author(s):  
Aparup Biswal ◽  
Anumolu Meher Prasad ◽  
Amlan Kumar Sengupta
Keyword(s):  
Precast Concrete ◽  
Shear Behavior ◽  
Shear Loading ◽  
Direct Shear ◽  
Concrete Wall ◽  
Wall Panels
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