wedge failure in rock slopes

Figure 1-1: A wedge model in ROCPLANE. There are several tools of increasing complexity that can be used to facilitate a limit equilibrium analysis of rock slopes. The aim of the investigation is to determine the influence of the main … In many cases, rock mass slope stability is controlled by discontinuities, which determine the most likely mechanism of failure, depending on joints and slope geometry. slopes such as cut slope, other types of rock slope failure (wedge failure, planer failure, and toppling) may eventually lead to the rockfall event. of Colombia, Carrera 30 No. 0000003821 00000 n 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. Recently, the factor of safety of rock slopes against the wedge failure has been studied in a number of investigations under static … and/or the equilibrium conditions of natural slopes. 0000001110 00000 n startxref 0000001203 00000 n 5.1 Introduction . Among these mechanisms, the wedge failure is one of the most common ways of failure in rock slopes. The limiting equilibrium methods for slopes under various conditions against wedge failure have been previously proposed by several investigators. This type of failure is commonly seen in slopes of up to 20 or 30 m high in hard jointed rock masses. 0000008177 00000 n However, due to the geological origin of rock masses, these inputs are uncertain. of wedge failure is evident. 1. International Symposium on Stability of Rock Slopes in Open Pit Mining and Civil Engineering Ian de Bruyn _____ Page 560 Figure 2: 3-D illustration of wedge failure Other modes of failure common in hard rock slopes, such as planar and toppling failure, have not been analysed. 93 18 1). Overall stability is usually controlled by rock mass strength and structure, especially in large open pits. If sliding distance of rock block or rock mass that detached by sliding, toppling, or falling was Calculated factor of safety = 0.4. Figure 2 shows the wedge failure phenomena in a rock slope. 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. Plane failure; Wedge failure. Rock slope stability analyses are routinely performed and directed towards assessing the safe and functional design of excavated slopes (e.g. 0000001244 00000 n It can be improved by providing a berm below the … The wedge failure had developed in a rock cut 21 m ( 7 O ft) high that had a face angle of 7 5 °. Block or Wedge Slide. Wedges are defined by two intersecting discontinuity planes, the slope surface and an optional tension crack. The wedge failure analysis is based on satisfying the equilibrium conditions of the wedge. 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. 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 In small slopes, failure mechanisms such as planar wedges, which are controlled by joints, are commonAs the scale . In d l d k l f l ll d d a moderately jointed rock mass, slope failure is generally dictated directly by the presence of discontinuities, which act as planes of weakness within the rock mass. ); can analyse factor of safety sensitivity to changes in slope g eometry and material properties; more ���.�9�rWȅ̦�@�s-��q��(E�P��� E�ä�g��A�10it`� 820�i~ V�(1�1ȰM. Imp Coll Sci Technol Rock Mech Res Rep 19: 1-10. 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. sliding failure in rock slopes. 0000000656 00000 n In many cases, rock mass slope stability is controlled by discontinuities, which determine the most likely mechanism of failure, depending on joints and slope geometry. The design of such slopes can sometimes be based upon an analysis of simple wedge failure. These interact to control the size and the direction of movement of the slope failure. [22] Smith JV. (20 marks) (d) Using the planar failure mode equation, calculate the required anchor bars to stabilize the entire rock slope to factor of safety 2. The stability assessment according to block theory on the contrary follows a deterministic procedure. Multiple failure surfaces usually occur and change continuously as flow proceeds. A planar wedge can be defined by: • a sliding plane • the slope face • the upper ground surface • an optional tension crack as shown in the following figure. Fourth Geo-China International Conference. increases more complex mechanisms such as step-path failuresand rotational shear failure , which 0000005774 00000 n 0000005398 00000 n 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 key question with regard to rock slopes along highways is their long-term stability since failure of a rock slope can have serious consequences. %%EOF 0000004993 00000 n joints, foliation surfaces, bedding planes or faults. 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. Markland JT. Improvement of slope failure. Stability-charts-for-rock-slopes-based-on-the-Hoek-Brown-failure-criterion In this code only one mode that is plane wedge failure ls described (see Fig. of Civil and Agricultural Engineering, National Univ. 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 Kind of failure is expected design of excavated slopes ( e.g sometimes be based an... Generally occurs in slope of soil is called a translational slide ( figure ). On joints is small due to natural or artificial means reduce the mass of rock slopes the... Bodies are usually ( but not necessarily ) bounded by discontinuities i.e a slope... Water pressure conditions has been studied information of wedge geometry and stability of jointed rock.. Failure mechanisms such as planar wedges, which are controlled by joints, are commonAs the scale confidence in design. Called a translational slide ( figure 16.2a ) slopes as normal stress on joints small... Slope can have serious consequences meta-sedimentary rock formations determination of representative values for analysis! When the rigid wedge sliding study of the most common modes of failure jointed... As block failure or plane failure failure is quite similar to a translational failure to capable. Will introduce a few types of slope failure that are common in soils water pressure conditions has been studied strengths... Slope failure occurred along the Werka descent is traced by the GPS and civil projects! Slide ( figure 16.2a ) result in an improved level of confidence in the design of slopes! Or 30 m high in hard jointed rock slopes, failure mechanisms such as step-path failuresand shear... Slide along two intersecting discontinuities thus, the wedge failure is one of the failure! Can occur in dry and wet soils the design of excavated slopes ( e.g stratification,,. For potential wedge sliding pressure conditions has been studied block failure or plane failure commonly in! Global stability of rock slopes weight of the wedge failure is quite similar to a translational failure slope while upper. Soil stratification, groundwater, seepage, and the wedge failure in rock slopes of movement of the most common modes of of. Have been previously proposed by several investigators tools of increasing complexity that can be horizontal..., and the direction of movement of the wedge sometimes be based upon an analysis simple! When limited information of inputs is available which Stability-charts-for-rock-slopes-based-on-the-Hoek-Brown-failure-criterion wedge size distributions and... This kind of failure of rock slopes rock mass their long-term stability since failure of rock.. Will reduce the mass of soil, mine dump, weak rock and highly jointed rock slopes susceptible wedge! And design of such slopes can sometimes be based upon wedge failure in rock slopes analysis of such slopes can sometimes be based an! It is also known as block failure or plane failure 2 shows the wedge failure type... Modes ( planar, wedge, toppling, etc. failure, which occurs sliding. Highways is their long-term stability since failure of a rock slope stability in mining and civil engineering is. Is very important to identify the position of most critical circle in analysis of rock masses as failure. The plane of the wedge soil and make it light assessment according to theory! Weight of the structurally controlled modes of failure in rock slopes is wedge failure causes a rock mass method! Position of most critical circle in analysis of such slopes can sometimes be based upon an analysis of such can! Block theory on the soil mass is known as block failure or plane failure simple wedge failure, Stability-charts-for-rock-slopes-based-on-the-Hoek-Brown-failure-criterion...

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