November 1984 with the computer program utexas stephen g. Methods for analysis of slope stability are described and are illustrated by examples in the appendixes. Free download slope stability analysis spreadsheet, method of slices slope stability analysis, slope stability analysis software free download, slope stability analysis examples, ordinary method of slices spreadsheet, slope stability analysis methods pdf, factor of safety calculation for slope stability, swedish method of slices example, slope analysis pdf, incoming search terms. The calculation of slope stability safety factors is a routine practice. These analyses are often completed using slope stability charts and the dsara deterministic stability analysis for road access slope stability program. Slope stability is controlled by relief material strength soil water content vegetation. What kinds of rock structures can reduce the stability of slopes. Global stability with relict slip surface in this scenario, the presence of the relict slip surface was assumed. With the development of cheaper personal computer, finite element method has been increasingly used in slope stability analysis. Stability of slopes in open excavation in different soil condition along with the factors that control slope stability in open excavation are discussed. Salunkhe and others published an overview on methods for slope stability analysis find, read and cite all the research. In the lecture part of this course we will discuss a variety of methods of analysis of slope stability and instability. Most critical circular shear surface from longterm stability computations for example prob lem b when cohesion is neglected crosssection of slope and coordinate axes for example problem c.
Evaluation of minimum factor of safety in slope stability analysis. Focus is on the principles of limit equilibrium analysis and the appropriate use of computer programs. Types of rock slope failures as shown in figure 151, most rock slope failures can be classified into one of four categories depending on the type and degree of structural control. What is the factor of safety and how does it apply to slope stability. The ph creduction stability analysis is based on an.
Slope stability analysis spreadsheet laobing kaisuo. This book describes the stateoftheart methodology for evaluating and analyzing soil strength and the design and stabilization of slopes in soil. The unit weight of the soil is 20 knm3, the effective cohesion c is 5 kpa and the effective angle of friction is 30. The slope stability probability classification sspc system is a rock mass classification system for slope engineering and slope stability assessment. Traditional slope stability analysis delivers the safety factor with respect to. Various excavation condition factors affecting slope stability in open excavation types of soil time during which the excavation is required to be open allowable degree of risk of. Pdf importance of slope stability problem is the reason why so many alternate methods have been developed for evaluating the safety of a slope. Slope stability is the best slope stability analysis software suite around providing complete supported slope analysis. This paper aims an overview on various methods of slope stability on the basis of assumptions, factor of safety calculation, soil conditions, soil types, applicability of output of the method with its limitations. Chapter 10 slope stability analysis nysdot geotechnical page 104 january 21, 2014 design manual 10. Verification hand calculations geoslope international.
Slope stability calculator last updated 12 dec 2014 requires firefox 3. Pdf nonlinear shear strength reduction technique in. Step 4 analyze the stability of the slope if a groundwater flow calculation is specified first to establish the phreatic surface, and then the stability of the slope is calculated. Stability computations with zero pore water pres sures for example problem b. The software in general is very good and ties in well with the way we do things here. Pdf advanced calculations of safety factors for slope. Analyzing slope stability by the limit equilibrium method, a. Slope w is formulated based on limit equilibrium theory. Please like and subscribe for an nguyens channel to watch the new videos.
Step 3 analyze the stability of the slope if a groundwater phreatic surface is specified in the slope. A larger slope permeability coefficient is associated with a greater probability of penetration with decreasing water level, which is favorable for slope stability. A guide to the program, including a detailed description of the procedures for input of data and an explanation of. The charts presented here are based on the kinematic approach of limit analysis that leads to a strict lower bound on. To assess the possibility of landslides involving natural or existing engineered. Geoslope international ltd, calgary, alberta, canada. It is essential that the engineering geologist be intimately familiar with all of these methods because they provide ways of.
In what ways does water added to a slope affect its stability. 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. Comparison with hand calculations geoslope international. Extensive studies have been under taken in this area, and a variety of these methods are. The method of stability analysis used see section 6. Application note slope stability analysis worked example 4. To exactly implement the nonlinear hoekbrown shear strength reduction in slope stability calculations, three aspects of the problem are considered. Chapter 6 slope stability, embankments, and hydraulic failure trevor l. Advanced calculations of safety factors for slope stability article pdf available in international journal of geotechnical engineering 34. Slope stability analysis stability analyses stability analyses were performed on eight cross sections of the proposed midbarataria sediment diversion mbsd to assess the potential for stability concerns or problems along the channel alignment from the inlet system to the western end of the conveyance channel.
Html 5capable browser required for graphical output. The setback gradient line measured from the toe of the slope, or channel assuming the location of the toe remains fixed with time. The effect of water on cut and fill slope stability is briefly discussed below. Determination of the critical slip surface in slope stability. Moreover, the verification process can increase the analysts confidence and understanding of the software. Stability of slopes for excavations in different soil types. Ru bbar and shansep soil strength pdf gsz page 2 of 8 3 case 1 ru only in this case, the porewater pressure condition is assumed to be described with an ru of 0. 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. Slope stability analysis of the potential failures using appropriate methods for the type of failure identified from the kinematic analysis. Engineers completing slope stability calculations should be familiar with the assumptions and limitations of the methods selected.
Determine the factor of safety fs for a soil slope. The probabalistic sara stability analysis for road access program is still under development. Firstly, the normal and shear stress relationship of the generalized hoekbrown criterion 2002. It accepts inputs of two known points, or one known point and the slope. Methods are also presented for checking the results of complex analyses and for presenting results of slope stability analyses. Various methods are available for slope stability analysis.
Pdf slope stability analysis methods danial salajegheh. Comparison of slope stability methods of analysis canadian. Slope stability evaluations by limit equilibrium and. Griffiths abstract a footing on the crest of a slope may be considered as either a slope stability or a bearing capacity problem. This type of analysis is also utilized to determine. Pdf in slope stability analysis, the limit equilibrium method is usually used to calculate the safety factor of slope based on mohrcoulomb criterion find.
Slope stability evaluations by limit equilibrium and finite. Calculate the factor of safety f against sliding along the potential failure surface qs. The paper compares six methods of slices commonly used for slope stability analysis. The use of the finite elements in calculations of stability has to overcome the weakness of the traditional methods. Application note slope stability analysis worked example. The stability analysis methods satisfying only moment equilibrium may be affected by manual. Limit equilibrium methodresults of slope stability analysesstatic loading filename. Chapter 9 embankments washington state department of. Slopew limit equilibrium software for slope stability analysis. First, calculate the factor of safety for a specified slip surface using the method of slices. Example application 1 slope stability for a cohesive and. The factor of safety equations are written in the same form, recognizing whether moment and or force equilibrium is explicitly satisfied. This was applied in the model by selecting all the boundary lines between the mudstone and weathered mudstone unshow the water table, to facilitate.
Some embankments constructed of material that is susceptible. Pdf slope stability analysis using limit equilibrium method in. Slope stability analyses and settlement calculations xenaki, doulis and athanasopoulos accompanying files 51. Further, for more complex analyses, the use of multiple methods for comparison is prudent. The calculation of the safety factors did not note any significant dif. Geo slope international ltd, calgary, alberta, canada. Also, explore hundreds of other calculators addressing math, finance, health, fitness, and more. Extensive studies have been under taken in this area, and a variety of these methods are available for generalized slip surfaces. A new computer program for performing slope stability calculations has been developed as part of research project 353 by the center for transportation research at the university of texas. Calculations and failure surface cross sections used in stability evaluations. Ru bbar and shansep soil strength geoslope international. The model domain used for this illustration is shown in figure 1. Next to gravity, water is the most important factor in slope stability.
Civilax is the knowledge base covering all disciplines in civil engineering. Among his papers ssmos slope stability analysis by three methods of slices with the hp41 programmable calculator in 1985 and ssis and sschkspreliminary slope stability analysis with the hp41 programmable calculator in. An analysis of stability was applied to a slope, of complex geometry, composed of alternating sandstone and marls using finite elements and limit equilibrium methods. Define the following a angle of repose, b sensitive soils, c hydrocompacting clays, d groundwater, e quick clays. It is essential that the engineering geologist be intimately familiar with all of these methods because they provide ways of determining, relatively unambiguously, whether a. Mar 21, 2016 the aims of slope stability analyses are to understand the development and form of natural slopes and the processes responsible for different natural features. Download spreadsheet to calculate slope stability calculation. The normal force equation is of the same form for all methods with the exception of the ordinary method. Results of your manual calculation with the help of excell program. Slope stability is the resistance of inclined surface to failure by sliding or collapsing. They are certainly major factors in cut slope stability and in the stability of fill slopes involving both internal and external slope failures. Calculation of slope stability by phic reduction ratio between available shear strength and the mobilized shear strength in the limit state of the system 2. Detailed pieziometric data at multiple locations and depths within and below the slope. Slope stability best slope stability analysis software.
Pdf advanced calculations of safety factors for slope stability. The forces acting on a sliding mass can therefore be verified using hand calculations. Stability of finite slopes with plane failure surface o culmanns method. Chapter 4 slope stability universiti teknologi malaysia.
Slope stability analysis is performed to assess the safe design of a humanmade or natural slopes e. Chapter 10 slope stability analysis nysdot geotechnical page 1011 january 21, 2014 design manual 10. A simplified solution for calculating the phreatic line. Slopew can effectively analyze both simple and complex problems for a variety of slip surface shapes, porewater pressure conditions, soil properties, and loading conditions. How do friction and cohesion work together to stabilize slopes. Slope stability analysis slopew is the leading slope stability software for soil and rock slopes. Evaluation of minimum factor of safety in slope stability. The aims of slope stability analyses are to understand the development and form of natural slopes and the processes responsible for different natural features.
Since, the sample analytical method for bearing resistance calculation in the informative annex d of ec7 does not apply to the case of footing on the crest of the slope, meyerhofs 1957 method will be used. 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. Run slope stability analyses and calculate required support force for given fs for the simple infinite slope case, hand calculation is sufficient but better use slope stability software use lpile or similar software that allows input of soil displacements instead of loads calculate soil reaction, deflection, bending moment. An analysis of stability was applied to a slope, of complex geometry, composed of alternating sandstone and marls us ing finite elements and limit equilibrium methods.
Application of the finite element method to slope stability. The graphics and the pointandclick data input are also very good and makes the program very easy to use. In some cases, the stability andor durability of the existing embankment fill may be questionable because the fill materials are suspect or because slope instability in the form of raveling, downslope lobes, or slope failures have been observed during the site reconnaissance phase. While computational tools have made most graphical methods and charts obsolete, stability charts for slopes are still routinely used in practice. Results of geotechnical calculations of the embankment internal slope stability analyses of the embankment under static and seismic loading conditions the internal slope stability analyses for the critical cross section of the examined.
European commission joint research centre institute for the protection and security of the citizen. The factor of safety with respect to strength f as expressed in equation 11. The presented geotechnical data have resulted from the geotechnical study implemented by edafomichaniki s. An overview on methods for slope stability analysis. Before the calculation of slope stability in these methods, some assumptions, for example, the side forces and their directions, have to be given out artificially in order to build the equations of equilibrium. It is clear from the results that when the height of reservoir water level decreases from 175 m to 145 m, the difference in the safety factor is only approximately 6% at md and md. Detailed pieziometric data at multiple locations and depths within and below the slope will likely be needed. Importance of water next to gravity, water is the most important factor in slope stability. Theory of slope stability kenneth m cruikshank portland state. This free slope calculator solves for multiple parameters involving slope and the equation of a line.
Slope stability analysis by the limit equilibrium method books. Pdf an overview on methods for slope stability analysis. Pdf soil strength and slope stability semantic scholar. To assess the stability of slopes under shortterm often during construction and longterm conditions. Slope stability verification manual deep excavation llc page 14. Determination of the critical slip surface in slope stability analysis muhammad alizadeh naderi submitted to the institute of graduate studies and research in partial fulfillment of the requirements for the degree of master of science in civil engineering eastern mediterranean university august 20 gazimagusa, north cyprus. Slope stability evaluation and acceptance standards.
379 244 396 695 249 1119 933 246 635 1643 831 488 824 1488 805 396 361 333 5 184 1407 1565 693 1382 1445 1063 502 1015 849 1460 1123 644 430 694 959 451 1378