... slope design q-slope value Upstream Oil & Gas stable slope discontinuity rock-wall contact strength reduction factor plane failure stability excavation slope angle wedge failure orientation factor Reservoir Characterization Barton rock slope stable structure filling q-slope method...

... calculates failure indices which are calculated as ratios of the number of discontinuities that cause plane failures or toppling failures, or the number of intersection lines that cause wedge failures, to the total number of discontinuities or intersection lines. The calculated failure indices are unaffected...

... the stuck-pipe wells. The tests were conducted in different orientations to the bedding planes. It was found that the strength along the bedding planes of the shale was much weaker than the intact shale material. Effect of bedding plane failure on wellbore stability in the shale was assessed using...

... ABSTRACT: The significance of tension cracks for the stability of slopes has been widely recognized. Prior studies are based on the Plane Failure model for the analytical solution of rock slopes in which the upper slope surface and the tension crack are inclined. In the present paper...

... of the toppling rock columns. The general character of the nomograms is discussed, together with the possibility of plane failure associated with toppling under certain conditions. The nomograms are then used to discuss the validity of the simple kinematic test intended for use on a stereonet. Its validity...