This assessment is difficult due to the large difference in. Stabilityassessmentandslopedesignat sandslootopenpit. Consistent standards fo r slope instability risk assessment criteria and procedures 5. Awba dam, analytical methods, factor of safety, morgensternprice method, slope stability. This is frequently the greatest source of inaccuracy in slope stability work, since the determination of the most critical conditions of pore water pressure is complex and costly. Seismic slope stability tfsss to study this issue and to make appropriate recommendations. Types of rock slope failures as shown in figure 151, most rock slope failures can be classified into one of four categories depending. The slope stability risk is presented as a factor of safety fos, analysis and assessment can be tailored to the requirements of our clients and results can be presented in accordance with industry standards.
Purpose this report presents the results of a slope stability assessment carried out for gortadroma landfill in october november 2016. Slope stability hazard assessment and mitigation methodology. Conditional probability of slope failure under seismic loading the dynamic model of slope stability, based on the newmark approach 24, considers landslide mass as a solid block sliding along the planar surface. Dozens of infinite slope analysis approaches and models onedimensional or twodimensional, such as shallow. One of the most widely used methods for this purpose is the classication of the slope rock mass. The slope stability assessment in this report is based on subsurface conditions in the boreholes, the observations during our site visits, and the slope profiles provided by the client.
Nicholson, hazard assessment for progressive, weatheringrelated break stability than other slope stability classification systems and can down of excavated rockslopes, q. Task specification determine the slope stability degree, first without the action of a strip surcharge and then under the. An overview on methods for slope stability analysis. Detailed assessment of the groundwater regime within and beneath the slope is also critical. Stability analyses of the slopes were carried out using the computer program slide 6 with the bishops method of analysis. Pdf to each variable instead of a single design value.
Pdf assessment of slope stability taleb hosni abderrahmane academia. Integration of all data types to develop a siteperformance model in terms of slope stability. The objective of this manual is to analyse the slope stability degree factor of safety. Slope stability hazard assessment and mitigation 167 presence of these filled sinkholes during excavation, have an adverse effect on the slope stability. Geology report agriculture slope stability assessment. Qualitative geotechnical hazard and risk assessment. Consider a slope in terms of geometry, geotechnical fabric and adverse dipping faults that form a wedge. It has been introduced recently to provide an initial prediction of rock slope stability assessment by applying simple assumptions which tend to reflect different failure mechanisms. Slope stability assessment on a regional scale represents a vital aspect of geoenvironmental disaster prevention and mitigation, and has been commonly utilized in slope stability analysis especially during critical rainfall events. Methods for analysis of slope stability are described and are illustrated by examples in the appendixes. Slope stability analysis is performed to assess the safe design of a humanmade or natural slopes and the equilibrium conditions. One of the most important parameters influencing the assessment of the stability is the shear resistance that the soil material can mobilize during shearing. The methods of analysis allow for the calculation of factors of safety for hypothetical or assumed failure surfaces through the slope. Stability analysis techniques specific to rock slopes, are described in chapter 12.
These lecture notes introduces the field of rock slope stability analysis and the purpose such analyses serve in the investigation of potential slope failure mechanisms. Threedimensional seismic slope stability assessment with the. Slope stability verification manual deep excavation llc page 11 e. Assessment of the stability of natural and articial rock slopes is an important topic in the rock mechanics sciences. A tsa may include options or recommendations to manage hazard or risk. Comparative study of slope stability analysis using. Assessing the stability of slopes is a difficult task that requires a rigorous approach. Santiago chile, november 2009 slope stability using these definitions, a risk assessment involves identifying hazards and calculating the risk, for example. Slope stability evaluation from a risk management perspective. Relationships between slope conditions, instability mechanisms, and resulting geometries. Pdf the paper deals with the assessment of slope stability on the road ii 595 near the village zlatno before and after the landslide caused by. Methods are also presented for checking the results of complex analyses and for presenting results of slope stability analyses.
Very often, due to the dynamics of mine slope layout and monitoring difficulties, information relating to groundwater pressures is either nonexistent or of poor quality. Assessing submarine slope stability requires estimating the likelihood, extent, and impact of a slide during the lifetime of the facility. Task specification determine the slope stability degree, first without the action of a strip surcharge and then under. Retaining walls assessment of overall stability global and compound. Detailed stability assessment of landslides is described in chapter. Initial structural stability assessment for the east ash pond at the f. Slope is the resistance of inclined surface to failure by sliding or collapsing. Cornwall consultants ltd are able to undertake analytical slope stability assessment in all material types, including soil and rock slopes. This book describes the stateoftheart methodology for evaluating and analyzing soil strength and the design and stabilization of slopes in soil. Embankments that do not support structures with side slopes of 2h.
Perform a slope stability analysis with a limit equilibrium method and find the critical slip surface i. Evaluation of the slope surface for safety factor against surficial failure shall be based either on analysis procedures for an infinite slope with seepage parallel to the slope surface or on other methods approved by the department. Slope stability assessment lot 3 on rp837881, 318 thirkettle avenue, frenchville 3. A thorough geotechnical assessment must me done in order to determine erosion control concerns and subsequent treatments.
Problems slope stability analysis natural slopes evaluation of existing natural slopes. Slope stability evaluation and acceptance standards. How does the slope angle play a role in slope stability. Determine the yield acceleration for the critical slip circle found in step 1 by. Terrain stability assessment tsa an assessment of landslide hazard, a landslide hazard analysis or a landslide risk analysis for terrain on or adjacent to which operations may be carried out. Geotechnical engineering is always governed by great uncertainties since. Focus is on the principles of limit equilibrium analysis and the appropriate use of computer programs. Assessment of seismic slope stability using gis modeling equations of slope and site response and their raster or vector based data integration methodologies.
Thepitissituatedonthe northern limb of the bushveld complex, some 250km northeast of johannesburg. Slope stability guidelines for development applications. This engineer manual em provides guidance for analyzing the static stability of slopes of earth and rockfill dams, slopes of other types of embankments, excavated slopes, and natural slopes in soil and soft rock. Based on the complete knowledge of the slope, this stability assessment re. Pdf the paper deals with the assessment of slope stability on the road ii595 near the village zlatno before and after the landslide caused by. Assessment of seismic slope stability using gis modeling. Slope stability assessment of layered soil v abstract slope stability is a crucial problem in geotechnical engineering. Thepitissituatedonthe northern limb of the bushveld complex, some 250km.
The advantages are that the slope stability assessment method based on the arctangent and tangent similarity measures of nns is simple and suitable and can assess slope stability problems in nn setting. Pdf on oct 3, 2015, mahammedi charf published slope stability analysis report find, read and cite all the research you need on researchgate. Downslope component of weight of material including vegetation, fill material, or. This paper starts by presenting a geotechnical characterization of slope movements that helps in classifying the information related to slopes. Stability assessment of landslideprone road cut rock.
Using specialist analytical software and industry best practice methodology, cornwall consultants ltd are able to. Fhwa nhi06088 6 slope stability soils and foundations volume i 6 3 december 2006 6. Slope stability analysis is performed to assess the safe and economic design of humanmade or natural slopes like embankments, road cuts, openpit mining, excavations, and landfills and the equilibrium conditions ammar and. For assessments of slope stability, it is important to characterize all the different types of uncertainties related to the.
Slope stability analyses exceed the criteria listed in 257. Slope stability analysis in that paper they conclude a methodology of slope stability analysis and provide an insight into the basic of constant affected by change in relationship for shearing stress and resistance. Slope stability evaluation from a risk management perspective diva. Threedimensional seismic slope stability assessment with. Numerous methodologies have been developed for slope stability analyses such as the limit equilibrium method, the numerical analysis method and the limit analysis method. Slope stability assessment of awba earth embankment using. However, more sophisticated methods have been developed to alleviate the deficiencies of the pseudostatic approach. One of the most widely used methods for this purpose is the classication of the slope. Application of the modified qslope classification system for.
The focus of this document is on the local stateofpractice, which has developed in part due to ottawas. The influence of groundwater pressure on mine slope. Slope stability analysis geotechnical design manual m 4603 chapter 74 december 2006 slope stability analysis. Slope stability assessment report somerset regional. The slope stability probability classification sspc system is a rock mass classification system for slope engineering and slope stability assessment. Rock slope stability analysis utilization of advanced.
Only after slope stability factors and the probability for slope failure have. Slope stability analysis is used in a wide variety of problems including, but not limited to. Hazardconsistent earthquake scenario selection for. This is in accordance with the epa waste licence w001704 issued to the site. Assessment of the slope stability of the existing final cover using two analytical methods, the infinite slope method soong and koerner, 1996, and the giroud and beech 1989 method. Slope stability analysis is a static or dynamic, analytical or empirical method to evaluate the stability of earth and rockfill dams, embankments, excavated slopes, and natural slopes in soil and rock. Thus, the fsmr method provides a better assessment of slope 27 d. The failure of a slope may lead to loss of life and property. Today, a vast range of slope stability analysis tools exist for both rock and mixed rocksoil slopes. Pdf assessment of slope stability on the road researchgate. The following three sets of conditions are usually. Slope stability assessment nuclear regulatory commission.
Slope stability causes of instability mechanics of slopes analysis of translational slip analysis of rotational slip site investigation remedial measures soil or rock masses with sloping surfaces, either natural or constructed, are subject to forces associated with gravity and seepage which cause instability. The presentation in this attachment has been separated into two parts. Geology slope stability assessment 2 p a g e geology slope stability assessment report for the tobias ecological restoration project area introduction the following information addresses the affected environment or existing pretreatment condition for the geology and slope stability within the tobias ecological restoration project area. The engineering design of slopes of manmade slopes in advance a earth dams and embankments, b excavated slopes, c deepseated failure of foundations and retaining walls. Schematic representation of a reinforced slope under seismic excitation the main seismic slope stability assessment. Importance of soil property sampling location in slope. Table 12 describes the details of landslide risk issues for different types of development applications that should be addressed in a geotechnical stability assessment report. Slope stability refers to the condition of inclined soil or rock slopes to withstand or undergo movement. As a result these guidelines were revised in 2008 to introduce two new methods of seismic slope analysis of soil slopes based on the concept of tolerable. Jan 01, 2020 the q slope system is an empirical method for discontinuous rock slope engineering classification and assessment.
Pdf integration of uav photogrammetry and kinematic. Slope stability assessment using stochastic rainfall simulation. Slope stability analysis portland state university. How do friction and cohesion work together to stabilize slopes. A set of 5 basic slope stability problems, together with 5 variants, was distributed in the australian geomechanics profession and overseas as part of a survey sponsored by acads association for computer aided design, in 1988. Rock slope stability assessment is basically used for designing and evaluating the slope stability of the rock and mean while this is used for safety of the mine site. Pdf soil strength and slope stability semantic scholar. Slope stability report gortadroma landfill waste licence w001704 page 1 of 11 1. Pdf assessment of rock slope stability using the fuzzy. Slope stability assessment sssa at the site in compliance with condition 8. The slope stability assessment was based on an effective stress limiting equilibrium analysis for long term slope stability using spencer, bishop and jambu methods. Rock slope stability analysis transportation research.
The stability condition of slopes is a subject of study and research in soil mechanics. They are certainly major factors in cut slope stability and in. During blasting the explosion gases will force their way out of the rock mass via the karstic discontinuities rather than by breaking intact rock or by following discontinuities to the next. The strength reduction method is usually adopted to determine the fs if the fem is used for slope stabilityanalysis grif. The resulting slope stability analysis provides an opportunity to assess the inherent distribution of failure statistics, and provides a much more complete picture of slope behavior. In geotechnical engineering, the topic stability of slopes deals with. Research article assessment of slope instability and risk. Detailed pieziometric data at multiple locations and depths within and below the slope.
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