A new approach to kinematic analysis of stress-induced structural slope instability

• Published in: Engineering geology 2015-03, Vol.187, p.56-59
• Main Author: Smith, J.V.
• Format: Article
• Language: English
• Subjects: Compressive properties; Instability; Kinematic analysis; Kinematics; Orientation; Planar sliding; Rock slopes; Slopes; Stability; Stress; Stresses; Toppling; Trajectories
• ISSN: 0013-7952; 1872-6917
• DOI: 10.1016/j.enggeo.2014.12.015

The compressive stress trajectory in a slope is parallel to the slope face. In a benched slope the compressive stress trajectory approximates the down-dip line of the overall slope. In steep, high slopes where compressive stress magnitude is high, slope-parallel compressive stress can play a major role in controlling instability related to movement on geological structures such as bedding, foliation and joints. A stereographic approach can be used for kinematic analysis of stress-induced structural instability. The proposed stereographic approach is based on identification of structural orientations relative to the local stress trajectories. Structures oriented obliquely to the principal compressive stress in a slope can become unstable leading to sliding and toppling mechanisms which can differ in orientation from those recognised in conventional gravity-based kinematic analysis. •The compressive stress trajectory in a slope is parallel to the slope face.•The compressive stress trajectory approximates the overall slope of benched slopes.•Stereographic approach used for kinematic analysis of stress-induced instability•Structural orientations with stress-induced instability can differ from conventional kinematic analysis.