The slope may demonstrate these conditions in a simple uniform manner or there may be complex conditions owing to variability in the slope geometry and heterogeneity in the slope material. The limiting equilibrium methods for slopes under various conditions against plane failure have been previously proposed by several investigators. A short summary of this paper. KEYWORDS: slopes; rocks/rock mechanics INTRODUCTION Plane failure—the downdip sliding on a single set of dis-continuities—constitutes an important mode of failure of rock slopes. Geotechnique -London- 54 (4) , pp. Kinematic Analysis – Planar Rock Slope Failure To consider the kinematic admissibility of plane instability, five necessary but simple geometrical criteria must be met: (i) The plane on which sliding occurs must strike near parallel to the slope face (within approx. The aim of the investigation is to determine the influence of the main parameters on the safety factor (Hoek and Londe, 1974). 2.4 Geometries of plane slope failure: (a) tension crack in the upper slope; (b) tension crack in the face 12 Fig. Planar rock slope failure occurs when a mass of rock in a slope slides down and along a relatively planar failure surface. While in rock the failure plane is predetermined, in soil failure, the failure plane occurs along the line of maximum stress. Mining under an open pit slope results in the collapse and slide of the slope. The slope face is vertical with a height H, the failure plane is oriented at an angle ψ, and a vertical load, L, is applied to the upper slope. 1: Dimensions and surfaces defining size and shape of wedge. Observed failure modes in rock slopes are of a wide variety. Landslide developed in rock mass usually has irregular shear plane. Copyright © 2021 Elsevier B.V. or its licensors or contributors. The wedge failure generates a failure plane that is inclined. Free PDF. a) For the rock slope shown below, derive an equation for the factor of safety against sliding using the plane failure equilibrium technique. Failure in rock slope masses governs by the presence of joints, its orientation, and joints’ persistence. joints and bedding planes) would be needed for every cut-slope for the assessment and identification of potential instability problems. Footwall slope Bi-planar failure Ploughing failure FDEM DEM Brittle fracture Footwall slopes refer to unbenched rock slopes in which the slope face is parallel to a set of persistent disconti-nuities (e.g. Areas subjected to slope deforma-tion can provide important insights into the actual cause of rock avalanching, and may help to identify key observations that warn or are precursors of future events. Conventional methods include; kinematic methods, empirical methods, limit equilibrium and probabilistic methods, whereas numerical methods include continuum, discontinuum and hybrid methods. The 24. Download PDF Package. Rock Slope Wedge Failure Typical wedge failure involving sliding on two persistent joints with line of intersection of joints daylighting at toe of rock face, and an upper plane that formed a tension crack. Rotational failure can be seen in finite slopes such as earthen dams, embankments, man-made slopes etc. Hoek and Bray 31 proposed a sliding failure model for the stability analysis of a plane rock slope for which the upper sliding body includes the horizontal sliding surface and vertical tension cracks. … There are several parameters including surcharge and seismic loads that govern the stability of the rock slope against plane failure in field projects. Summary A simple formula for plane slope failure is derived, which may be used for the design of … Rock slope failure involves an interplay between existing discontinuities and development of new fractures in intact material. Definitions of key Terms in Slope Failure. Geometry of slope exhibiting plane failure: (a) cross-section of the rock slope with a plane failure situation; and (b) release surfaces at ends of plane failure. Login; Hi, User . A three-dimensional wedge failure analysis was presented by Coates (1967), Lond et al (1970) and Hudson & Harrison (1997). Search: Search all titles. Stability analysis of anchored rock slopes against plane failure subjected to surcharge and seismic loads @inproceedings{Hossain2011StabilityAO, title={Stability analysis of anchored rock slopes against plane failure subjected to surcharge and seismic loads}, author={M. Hossain}, year={2011} } 9, No. If sliding distance of rock block or rock mass that detached by sliding, toppling, or falling was negligible to descending distance through air, it is dened as Download Free PDF. This construction legal animation illustrates how a slope failure occurred in a reservoir. Plane failure in rock slope. Hoek and Bray (1981) gave an analytical approach for plane failure analysis for rock slopes that is limited to those slopes in which the upper slope surface is horizontal and the tension crack is vertical. Source: A Short Course in Soil and Rock Slope Engineering, 1 Jan 2001 (241–261) Investigation of rock anchorage failures and cutting remediation at Glyn Bends, North Wales, UK. Therefore, in kinematic analysis, the orientation of the combination of discontinuities and slope face is examined to determine if certain modes of failure can be occurred. 3.2 . Failure of a rock slope on one or two plane surfaces is the simplest but at the same time the most important type of sliding failure and forms the basis for the stability analysis of rock slopes. discontinuities, several types of slope failure, such as plane failure, wedge failure, toppling failure, buckling failure and circular failure, are often observed. In Fig. PDF. The intersection of planar discontinuities in the rock mass with the surface slope is predisposing toward plane and wedge failures. Major plane failure in granite rock slope. The K M Mountain land-slide in the state of Washington (Lowell 1990), Corpus ID: 109749725. Sliding mass is the mass of soil within the slip plane and the ground surface. 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