Slope stability analysis and mitigation measures in the area. Simplified assumptions in 2d slope stability methods have led to factors of safety that differ from the more rigorous 3d slope stability analysis methods. For all but very weak rock materials, the analysis of rock slope stability is fundamentally a twopart process. Pdf in this paper a numerical analysis of slope stability problems in blocky rock. This allows a more realistic estimation of the effects of a seismic event on a. One is reliability analysis for a single failure mode of rock slope stability. Investigations carried out in sweden on slope failures indicated that the failure surface resembles the arc of a circle. How do friction and cohesion work together to stabilize slopes. Slope w can effectively analyze both simple and complex problems for a variety of slip surface shapes, porewater pressure conditions, soil properties, and loading conditions. New material contained in this book includes the latest developments in earthquake engineering related to slope stability, probabilistic analysis, numerical analysis, blasting, slope movement monitoring and stabilization methods. The stability condition of slopes is a subject of study and research in soil mechanics, geotechnical engineering and engineering geology. The main objectives of slope stability analysis are finding endangered areas, investigation of potential failure mechanisms, determination of the slope sensitivity to different triggering mechanisms, designing of optimal slopes with regard to safety, reliability and economics, designing possible remedial measures, e.
Slope stability analysis, design, and repair services alpha. Tagasoft geotechnical software slope stability analysis. This chapter deals with rock slope stability, a subject that has shown remarkable. Rock slope stability analysis gian paol giani deals with the methods of assessing the stability of rock slopes and the techniques of improving the stability conditions of natural and artificial slopes which are at risk. The wellknown classification of rock masses titled rock mass rating system 1 was used for categorizing the rock masses in the studied area besides slope mass rating 2 which would help to estimate the rock stability. The reliability of a rock slope with a single failure mode has been inves. Rock slope stability analysis based on terrestrial lidar.
The spencer method of slope stability analysis was used to assess the stability of the wall using the same rock mass parameters as in the udec analysis. Rocfall is a statistical analysis program designed to assist with assessment of slopes at risk for rockfalls. This paper explores the feasibility of using optimization methods to search for the minimum factor of safety in slope stability analysis. Slope stability analysis slope w is the leading slope stability software for soil and rock slopes. The first step is to analyze the structural fabric of the site to determine if the orientation of the discontinuities could result in instability of the slope. The aznalcollar pit is dealt with in chapter 4, and in chapter 5, some conclusions and recommendations for future applications. Reliability and uncertainties of the analysis of an unstable rock. Slope stability best slope stability analysis software.
Afosm method, reliability index, probability of slope failure, system. The most serious disorders which can occur in slopes are 1 the sliding of blocks along the discontinuing surfaces which exist at the opening of trenches and 2 rock falls or sliding of blocks resulting from the rapid change in the mechanical characteristics of the rock bench which supports them. Role of vegetation and environmental characteristics on slope. Considering the combined effect of slope overload, seismic load, anchoring effect, ice frost, slip surface drag force and slope groundwater pressure, the comparative analysis of typical rock slope sliding stability under waterless and saturated conditions shows that, the outflow joint blocking and the groundwater levels rising have obvious. In civil engineering, projects include transportation systems such as highways and railways, dams for power production and water supply, and industrial and urban development. In the vast majority of slope stability analysis cases, geotechnical engineers primarily conduct design based on calculated factor of safety values. These methods consist in cut ting the slope into fine slices so that their base can be com parable with a straight line then to write the equilibrium. Based on the assumption of the improved groundwater pressure distribution, the calculation expression of antisliding stability factor for typical watersaturated rock slope is deduced through limit equilibrium method. Methodology of slope stability analysis it is a method to expresses the relationship between resisting forces and driving forces driving forces forces which move earth materials downslope. The factor of safety is a very useful index for determining how close or far away a slope is from failure, and its accuracy is consistent with the accuracy of geotechnical input data. Simple failure mechanisms using uniform rigid rock block motions are incorporated in the yield design kinematic approach. Rock slope stability analysis giani, gian paolo on. Numerical methods of analysis used for rock slope stability may be conveniently divided into three approaches.
Design of overall slope angle and analysis of rock slope. Both volumes are very large electronic pdf files which may take several minutes to download. Generally, reliability analysis of rock slope stability can be divided into two categories. Highway administration, usa giani jp 1992 rock slope stability analysis. The seismic response of the rock slope is difficult to fully understand due to the discontinuity of the structural planes and the complex interaction mechanism between the structural planes and seismic waves,14. Various types of slope stability problems cohesionless fills built on firm soil or rock. Nowadays, different approaches are available to evaluate the stability of a particular slope 1, 2, and 3. Rock slope stability analysis, p giani, 1992 free ebook download as pdf file. Numerical analyses methods are the most common ones that are used for rock and soil slope analyses. Galena was originally developed for mining applications, and has also been widely accepted as a valuable tool for use in civil and the broader geotechnical engineering fileds, and within teaching and research. In practice, 3d analysis of slope stability is not performed unless the geometry of the slope is very complex and complicated or the failure mechanism is compound. Pdf stability analysis of a rock slope in himalayas. Antisliding stability analysis of saturated rock slope. In this paper a numerical analysis of slope stability problems in blocky rock is presented with emphasis given to the various possible failure modes block sliding andor block tilting.
To reveal the validity and applicability of the developed enmm, some numerical examples of rock slope stability analysis are investigated, in which one. The stability of a rock slope containing a wedge resting. Development of the numerical manifold method for dynamic stability analysis of rock slope failure viii furthermore, parallel computing with openmp is evaluated to improve efficiency of the nmm. Rock slope stability analysis has been used for decades in monitoring exposed rock slope to evaluate their potential hazard. Deals with the methods of assessing the stability of rock. Application note slope stability analysis worked example 1 introduction this note describes the typical steps followed in setting up and analysing a slope stability problem with limitstate. The fundamental objective in designing most slopes is to achieve the steepest slope possible consistent with knowledge of material properties, site constraints, external loads, required safety factors, and so on. Small rockfalls, which may involve handsized rocks weighing only a few kilograms, can cause fatal injuries to workers away from the. The effects of an obliquely inclined upper slope surface, a tension crack behind the slope face, water within the tension crack and on the sliding surfaces and an external force, due for example to a cable anchor, are included in the analysis. Application note slope stability analysis worked example 4. Rock slope stability download ebook pdf, epub, tuebl, mobi.
Rock slope stability analysis article pdf available in canadian geotechnical journal 312. Slope stability analysis geotechnical design manual m 4603 chapter 74 december 2006 slope stability analysis detailed assessment of the groundwater regime within and beneath the slope is also critical. Slope stability analysis by the limit equilibrium method. Rock slope stability analysis, p giani, 1992 scribd. Analytical and numerical analyses for rock slope stability. Stability analysis of jointed rock slope sciencedirect. Rock slope stability analysis hardcover january 1, 1992 by gian paolo giani author see all formats and editions hide other formats and editions. A gint library file will be provided for processing and presenting field and lab results. Giani 1992 however, cited that although the coulomb criterion is widely used, it is. Pdf on jan 1, 2011, alavi nezhad khalil s v abad and others published rock slope stability assessment by using kinematic analysis and slope mass rating at bandar seri alam, johor find, read. The book deals with the methods of assessing the stability of rock slopes and the techniques of improving the stability conditions of natural and artificial. The mechanical behaviour of rock masses is determined by the geometry of the slopes and the discontinuity properties. Rock slope stability analysis lec 1 linkedin slideshare. Downslope component of weight of material including vegetation, fill material, or.
Attachment a contains information regarding the slope stability analysis and includes five exhibits of supporting data. Slopes in mountainous regions require cohesion 8 undrained short term slope failure in clay. Fhwa nhi06088 6 slope stability soils and foundations volume i 6 3 december 2006 6. While less than 1% of reported accidents are associated with slope stability problems, slope failures were responsible for about 15% of all u. System reliability analysis of rock slope stability. It also highlights some of the differences in approach to that adopted by the limit equilibrium method of slices. Low efficiency and unreliability are the problems commonly encountered. These slopes occur on reclaimed lands and active mine sites. Slope stability analysis and mitigation measures in the area of the sighisoara medieval citadel the sighisoara medieval citadel has a very big importance to the cultural, architectural and historical heritage of romania. Small rockfalls, which may involve handsized rocks weighing only a few. System reliability analysis of rock slope stability involving. This was applied in the model by selecting all the boundary lines between the mudstone and weathered mudstone unshow the water table, to facilitate. Footwall slopes refer to unbenched rock slopes in which the slope face is parallel to a set of.
Galena is one of the worlds leading slope stability analysis packages now used in 74 countries, in some of the worlds largest mining operations. Roctopple is an interactive software tool for performing toppling analysis and support design of rock slopes. Limit equilibrium methods are still currently most used for slopes stability studies. Kdot geotechnical manual 2007 edition the kdot geotechnical manual is available two volumes. Fundamentals and methods presents basic principles for the safe design of constructed or natural earth slopes. The routine procedure includes comparing a number of admissible surfaces that are basically selected by random searches. Attachment b contains information regarding the erosion analysis and includes six exhibits of supporting data. The stability of this particular slope was critical because it. Numerical study on seismic response of a rock slope with.
The other is system reliability an alysis for multiple failure modes of rock slope stability. Rock slope stability analysis transportation research board. This report, rock engineering guides to good practice. The slope stability analysis has been prepared in accordance with the proposal dated june 2,2000. This chapter addresses rock slope stability analysis. Rock slope stability analysis utilization of advanced. Pdf on jan 1, 2011, alavi nezhad khalil s v abad and others published rock slope stability assessment by using kinematic analysis and slope mass rating at bandar seri alam, johor. Characterization of biplanar and ploughing failure. The rocks present at the bridge site are heavily jointed. The objective of the analysis was to evaluate and judge the condition and overall stability of the exposed rock, and identify where.
Safety factor sf calculation for a slope a without tension crack b with a waterfilled tension crack. Rock slope stability analysis gian paol giani deals with the methods of assessing the stability of rock slopes and the techniques of improving the stability conditions of natural and. The probabalistic sara stability analysis for road access program is still under development. These analyses are often completed using slope stability charts and the dsara deterministic stability analysis for road access slope stability program. Detailed pieziometric data at multiple locations and depths within and below the slope will likely be needed. Global stability with relict slip surface in this scenario, the presence of the relict slip surface was assumed. Evaluating techniques for monitoring rock falls and slope.
Slope stability refers to the condition of inclined soil or rock slopes to withstand or undergo movement. Soilvision award winning geotechnicalhydrogeological. Slope stability analyses include static and dynamic, analytical or empirical methods to evaluate the stability of earth and rock fill dams, embankments. Application note slope stability analysis worked example. Applicazione di modelli cinematici per lo studio di frane. Galena slope stability analysis online slope analysis software is used for performing stability analyses of backills, road embankments, pond embankments, landslides, or natural slopes. A model study of slope stability in mines situated in. Today, there are several methods for slope stability analysis, each has its own advantages and disadvantages. In chapters 2 and 3, the hoekbrown failure criteria are described, along with methods to estimate equivalent strength properties for the rock mass. It also describes survey and measurement methods to model the behaviour of rock masses. The stability analysis of a jointed rock slope with two sets of unfilled joints, under its own weight, is carried out directly by considering failure surfaces along some particular joints and also going through the intact rock. The software models the factor of safety of these features using the simpliied bishop, spencer. Therefore, detailed information of the discontinuity properties such as dip angle, strike, dip.
The failure process of a soil slope as shown in fig. Fellenius developed a method for stability analysis of a slope assuming a circular failure surface, which is known as the swedish circle method. The groundwater analysis in slide allows the user to easily define and analyze a groundwater problem, using the same model as for the slope stability problem. Slope stability evaluation for the new railway embankment. The results of the analysis with critical failure surfaces through the rock mass show that the wall is stable and estimates the factor of safety to be 2. The boundaries of the problem only need to be defined once, and will be used for both the groundwater analysis and the slope stability analysis.
Rock slope stability analysis a variety of engineering activities require excavation of rock cuts. Evaluation of slope stability is one of the daytoday practices of geotechnical engineers. Alpha adroit also offers consulting services for preventive and remedial measures for small scale and large scale landslides throughout alberta, british. Stability analysis of finite slopes using the swedish circle method. In rock engineering, slope stability analysis is a two stage procedure.
Slope stability evaluations by limit equilibrium and. Despite the advances that have been made, evaluating the stability of slopes remains a challenge 4, 5, 6, and 7. The other is system reliability analysis for multiple failure modes of rock slope stability. Pdf rock slope stability assessment by using kinematic. Deals with the methods of assessing the stability of rock slopes and the techniques of improving the stability conditions of natural and artificial slopes which are at risk. This force is normal to the force n, has a magnitude equal to n tan. Roctopple makes it easy to visualize the slope failure in both 2d and 3d. Rock slope stability transportation research board. Evaluation of minimum factor of safety in slope stability. Our software is utilized in the mining, infrastructure, energy, arctic and nuclear industries for the design of large earth dams, mine tailings consolidation, waste rock slope stability, retaining wall design, and foundation design in arid and arctic environments. Conventional methods of rock slope analysis conventional methods of rock slope analysis can be generally broken down into kinematic and. Galena is a powerful, comprehensive and userfriendly slope stability analysis system developed by practising engineers for engineers.
Slope stability analysis, design, and repair services alpha adroit engineering ltd provides slope stability analysis, slope design, slope failure investigation, and slope and landslide repair. The limit equilibrium method is the most common approach for analyzing slope stability in both two and three dimensions. Symbol parameter dimensions f factor of safety against sliding along sheet joint calculated h height of the overall slope or of each bench 60 m or 20 m respectively. In this simulation, the transverse direction of the computational model is constrained to yield a plane strain state 120. Design and analyze planar rock slopes with rocplane. Accecalc rock slope stability analysis under seismic conditions. Stability analysis of rock slopes using the finite element. Considering the combined effect of slope overload, seismic load, anchoring effect, ice frost, slip surface drag force and slope groundwater pressure, the comparative analysis of. The types of stabilization include rock anchors, shotcrete, drainage and scaling, as well as rock fall protecting.
The citadel is situated on the fortress hill and it is the only inhabited fortress in romania. Rock slope stability analysis pdf free download epdf. Stability analysis of a rock slope in himalayas 3 fig. Therefore, the seismic stability of rock slopes constitutes one of the most important topics in geotechnical engineering.
Stability analysis of rock wedges with multiple sliding. They are certainly major factors in cut slope stability and in. One of the softwares that can analyze rock slope stability in a nu. There, three major sections are available in the thesis. Our software offers advanced analysis considering climate and unsaturated flow. Rock slope stability analysis gian paol giani download. Wyllie and mah 2004 and giani 1992 states rock material experienced a. Rock slope stability analysis k6nqdo12zz4w idocpub. Kinematic analysis is a method used to analyze the potential for the.
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