From a rock slope design perspective, the most important characteristic of a discontinuity is its (a) Wedge failure on two Planar failure in rock in which a intersecting discontinuities with discontinuity 'daylights" the a line of intersection which slope face Random sets arise as a powerful tool to deal with uncertainty, even when limited information of inputs is available. slopes such as cut slope, other types of rock slope failure (wedge failure, planer failure, and toppling) may eventually lead to the rockfall event. The results indicated the potential for both planar … 0000002658 00000 n The proposed techniques arguably result in an improved level of confidence in the design of rock slopes susceptible to wedge failure. Markland JT. Translational Slide. This type of failure occurs when there are fissures, joints, or weak soil layers in slope, or when a slope is made of two different materials. There are several tools of increasing complexity that can be used to facilitate a limit equilibrium analysis of rock slopes. Multiple failure surfaces usually occur and change continuously as flow proceeds. Slope failure can be improved by flattening the slope which will reduce the mass of soil and make it light. Thus, the stability assessment method has to be capable of coping with this uncertainty. IS 14448 (1997): Code of practice for reinforcement of rock slopes with plane wedge failure SWedge is a quick, interactive and simple-to-use analysis tool for evaluating the geometry and stability of surface wedges in rock slopes. These failure modes pro-vide a basis for the formulation of limit state functions so the prob-lem of stability of individual wedges in rock slopes is considered. Block or wedge slides occur when a soil mass is shattered along joints, seams, fissures, and weak zones by forces emanating from adjacent soils. startxref The stability of the rock wedge is controlled by: joint sets dip and dip direction, slope geometry and direction, external forces (including water pressure and earthquake) and rock and joints mechanical properties. 0000000656 00000 n Wedge Failure Wedge failure can occur in rock mass with two or more sets of discontinuities whose lines of intersection are approximately perpendicular to the strike of the slope and dip towards the plane of the slope. The toe of the cut was within 6 m (20 ft) of the railway, so even a minor slope failure could reach the track. The stability of the rock wedge is controlled by: joint sets dip and dip direction, slope geometry and direction, external forces (including water pressure and earthquake) and rock and joints mechanical properties. The analysis and design of rock slopes susceptible to wedge failure is of interest to both civil and mining engineering. Introduction. Stability-charts-for-rock-slopes-based-on-the-Hoek-Brown-failure-criterion The present work focuses on the study of the wedge failure, which occurs as sliding of a mass of rock on two intersecting planes, generally discontinuity planes. An extract from Stability Analysis of Rock Slopes for Plane & Wedge Failure with the Aid of a programmable Pocket Calculator, K. Kovari and P. Fritz, Federal Institute of Technology Zurich, Switzerland Institute of Highways and Underground Structures, Department of Rock Mechanics, 10 pgs. " Abstract: The failure mechanisms of hard rock slopes are usually dominated by the joint and fault system of the rock mass, the properties of which show an inherent spread. Among these mechanisms, the wedge failure is one of the most common ways of failure in rock slopes. Because the potential failure was located above a major railroad line, it was necessary to carry out this work with minimal interruption of traffic. The analysis technique chosen depends on both site open pit mining, road cuts, etc.) Contrasting features of the different rock [22] Smith JV. 4). Fourth Geo-China International Conference. E-mail: Professor, Dept. The wedge failure is quite similar to a translational failure. 0000005876 00000 n Because the rock mass behavior is significantly governed by the presence of joints or other discontinuities, several types of slope failure, such as plane failure, wedge failure, toppling failure, buckling failure and circular failure, are often observed. open pit mining, road cuts, etc.) Slope failures depend on the soil type, soil stratification, groundwater, seepage, and the slope geometry. 0000005198 00000 n Translational slides in rock masses are dependent upon the spatial arrangement of the discontinuities within the mass and their relationship to the geometry of the slope. Calculated factor of safety = 0.4. Two arrangements are considered: Plane failure Note: The application Rock Slope can evaluate a broken rock wall by a shear failure (rock slides) using a planar and/or a polygonal shear plane and a rock wedge. %%EOF Overall stability is always checked for the possibility of deep-seated failure through the rock mass and the method of slices is usually the tool of choice. Improvement of slope failure. of Civil and Agricultural Engineering, National Univ. The wedge failure is quite similar to a translational failure. <]>> 0000000016 00000 n Dilatancy in a rock mass is unconstrained near slopes as normal stress on joints is small due to weight of the wedge. This paper presents the results of the slope failure analyses from fracture distributions and their relation to tectonic activity; the analytical results have indicated that the phenomena of plane failure, wedge failure and toppling failure can occur at almost of the survey sites within the study area. increases more complex mechanisms such as step-path failuresand rotational shear failure , which Summary A simple formula for plane slope failure is derived, which may be used for the design of … Slope stability in mining and civil engineering projects is always a problem of great concern. The rock type was a very competent, massive granite 110 0 obj<>stream of Colombia, Carrera 30 No. PDF | On Jun 20, 2008, Mohamed Fadlelmula and others published Reliability-Based Modeling of Wedge Failure in Rock Slopes | Find, read and cite all the research you need on ResearchGate 0000003821 00000 n slopes with plane wedge failure [CED 48: Rock Mechanics] IS 14448: 1997 Indian Standard CODEOFPRACTICE FOR REINFORCEMENT OFROCKSLOPES WITH PLANEWEDGEFAILURE ICS 93.020 1997 BUREAU OF INDIAN STANDARDS MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG NEW DELHI 110002 October 1997 Price Group 5 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. The wedge failure phe-nomena in a rock slope. Rock slope stability analyses are routinely performed and directed towards assessing the safe and functional design of excavated slopes (e.g. the study of the wedge failure, which occurs as sliding of a mass of rock on two intersecting planes, generally discontinuity planes. Kinematic Analysis – Rock Slope Wedge Failure Similar to planar failures, seve ral conditions relating to the line of intersection must be met for wedge failure to be kinematically admissible : (i) The dip of the slope must exceed the dip of the line of intersection of the two wedge forming discontinuity planes. We will introduce a few types of slope failure that are common in soils. 2nd Quarter 2005 C over Story Figure 3. Wedge Failure Wedge failure, also known as block failure or plane failure, generates a failure plane that is inclined. Among these mechanisms, the wedge failure is one of the most common ways of failure in rock slopes. 0 0000024197 00000 n of Colombia, Carrera 30 No. 0000001488 00000 n While performing kinematic analysis for wedge failure of rock slope in Dips 6.0 software (RocScience), it indicates region of secondary wedge failure envelop (marked by yellow by default). With this framework, this work presents a reliability assessment of wedge stability in rock slopes by random sets, considering the joints geometry and strength parameters as random uncertain variables. E-mail: © 2016 American Society of Civil Engineers, Estimation of the Lower and Upper Probabilities of Failure Using Random Sets and Subset Simulation, Vulnerability, Uncertainty, and Risk: Quantification, Mitigation, and Management, Stochastic Response Surfaces, Interval Analysis, and the Reliability of Structures, Comparison of Slope Reliability Methods of Analysis, GeoFlorida 2010: Advances in Analysis, Modeling & Design, A Random Field Approach to Reliability Analysis With Random and Interval Variables, ASCE-ASME Journal of Risk and Uncertainty in Engineering Systems, Part B: Mechanical Engineering, https://doi.org/10.1061/9780784480007.002, © 1996–2021, American Society of Civil Engineers. 0000001110 00000 n The main assumptions in a planar wedge analysis such as ROCPLANE… Is based on information of inputs is wedge failure in rock slopes of wedge geometry and stability rock... 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