System sciences and earth natural hazards stability of. Slope stability analysis of peat landslides has been undertaken in relatively few cases. Factors affecting the stability analysis of earth dam slopes. 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. 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. Slope stability is ultimately determined by two factors. Rightofway is too limited for constructing side slopes. What are the factors that influence slope stability. In order to promote public education and public safety, equal justice for all, a better informed citizenry, the rule of law, world trade and world peace, this legal document is hereby made available on a noncommercial basis, as it is the right of all humans to know and speak the laws that govern them. The first to make a valid slope stability analysis possible through use of simple charts and simple equations was taylor 9.
The most common slope stability analysis methods are based on simplifying assumptions and the design of a stable slope relies heavily on experience and careful site investigation. Slope failure can often be catastrophic, involving the loss of considerable property and many lives. The following figures shows a retaining wall of height h. Chapter 10 slope stability analysis nysdot geotechnical page 106 january 21, 2014 design manual 10. This paper research explained about slope stability of earthen dams using geostudio software. Slope stability analysis of earth dam by slip circle method.
The second is the influence of calculating factor of safety to slope stability and the third aspect is the definition of the slope. It provides guidance for understanding and applying policies, standards and criteria in recognition of the need to. The stability of a natural slope is also important. On the reliability of earth slopes in three dimensions.
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. The biggest drawback for general determination of slip surface is that it must presuppose the shape of slip surface and is unable to. In this chapter, we will examine the stability of earth slopes in two dimensional space using limit equilibrium methods. Static analyses of embankment stability, including subsections on the limit equilibrium method of slope stability analysis, types of potential failures surfaces evaluated, location of potential failure surfaces for analyses, and recommended factors of safety. For the numerical dynamic calculations are necessary detailed knowledge of structure and properties of slope. Earth pressure and retaining wall basics for nongeotechnical engineers richard p. Slope and general stability to din 4084 and ec7 analysis after bishop, janbu, using the general wedge or vertical slice method choice of analysis using either partial safety factors to din 1054. The influence of earthquakes on openpit slope stability.
The majority of slope designs will be established based on the provisions in this section. In the lecture part of this course we will discuss a variety of methods of analysis of slope stability and instability. Kleinfelders team of slope stability experts includes engineering geologists, geotechnical engineers, construction professionals, structural engineers, civil engineers, and asset management specialists experienced in the specific demands of earth and rock slopes. Slope stability analysis incorporating tbe effect of soil suction d. Geotechnical technical guidance manual may 2007 introduction 11 section 1 introduction this geotechnical technical guidance manual tgm provides technical guidance for geotechnical work performed by the federal lands highway flh. Washington division of geology and earth resources open file. Slope stability of the centraliachehalis area, lewis county, washington by allen j. Division of geology and earth resources raymond lasmanis, state geologist slope stability of the longviewkelso urban area cowlitz county by allen j. An earth slope is an unsupported inclined surface of a mass. Eurosoilstab, 2002 for a successful stabilization, a. Slope stability upper section earth tech material properties figure e8 1.
This program is used to perform slope stability analysis embankments, earth cuts, anchored retaining structures, mse walls, etc. Pdf probabilistic stability analysis of earth dam slope. Pdf stability analysis of embankments and slopes researchgate. There are numerous factors that affect slope stability analysis. This is due to the removal of the balancing hydraulic forces acting on the dams and the undrained condition within the upstream slope soils. Claraw, a windows version of the threedimensional slope stability program. Generally, in earthen dams, the factors included in this analysis are the specific site, foundation conditions, construction material characteristics and. The probabalistic sara stability analysis for road access program is still under development. On the reliability of earth slopes in 3d 3147 table 1. Gravitational force force due to seepage water erosion of the surface of slopes due to flowing water the sudden lowering of water adjacent to a slope.
Thus, the pseudostatic slope stability procedure is a potentially attractive design tool. Detailed slope stability analysis and assessment of the. They are certainly major factors in cut slope stability and in. In addition, for comparison reasons, a slope stability analysis of the carsington earth embankment. Application of the finite element method to slope stability. Procedures for design of earth slopes using lrfd missouri. Washington division of geology and earth resources open file report 7301s, slope stability map of southern snohomish county, washington 1974 author. The stability of slopes of earth dams is checked under the following conditions. This book is a practical treatise on the stability analysis of earth slopes. Chapters include geotechnical and geomechanical analysis techniques, hydrology, rock slope stabilization techniques, and geotechnical instrumentation and monitoring. Overview of manual the objective of this manual is to present guidance on the design, construction, and performance monitoring of and modifications to embankment. Methods for analysis of slope stability are described and are illustrated by examples in the appendixes. In geotechnical engineering, the topic stability of slopes deals with. Corestones at the slope face clayinfilled relict joint parallel to the slope face relict joint surfaces within weak matrix fig.
Another aspect of water that affects slope stability is fluid pressure. However, use of these load and resistance factors will limit the benefits that can be achieved through adopting. The stability condition of slopes is a subject of study and research in soil mechanics, geotechnical engineering and engineering geology. Client resources all files posted on this page are password protected. Gravity the main force responsible for mass movement is gravity. Physical properties of soil and its implication to slope. The comprehensive formulation of slope w makes it possible to easily analyze both simple and complex slope stability problems using a variety of methods to calculate the factor of safety. Verification analysis of the slope stability program. We can see that the shear strength of a soil plays a critical role in the evaluation of stability for earth slopes and retaining structures. The slip surface is considered as circular bishop, felleniuspetterson, janbu, morgensternprice or spencer methods or polygonal sarma, janbu, morgensternprice or. Slope stability analysis under different soil nailing parameters using the slope w software article pdf available in journal of physics conference series 11741. Although similar in concept to its dos predecessor, which has been in use for more than a decade, this is a totally new program with a number of powerful capabilities for both 3d and 2d analysis. The important factors that cause instability in a slope and lead to failure are 1. Earth pressure and retaining wall basics for nongeotechnical.
Principle of slope stability analysis sliding will occur if the shear stress developed exceeds the corresponding shear resistance of the soil. Nelson, 6 oct 2010 gravity is the main force for mass wasting. The implications of joints and structures for slope stability s. Slope stability slope stability slope stability, triggering events, mass wasting hazards gravity the main force responsible for mass wasting is gravity. Chart solutions for analysis of earth slopes john h. 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.
Where this has been done, the peat failure is usually treated as a translational planar slide and a simple infinite slope analysis is used to back calculate strength parameters of the slope at the time of failure hendrick, 1990. Thus, the classification of earth slopes is as follows see fig. Use porewater pressures from seepw, seep3d, sigmaw, or quakew. The results of the handmade calculations are compared with the results from the geo5 slope. Slope w is a software product that uses limit equilibrium theory to compute the factor of safety of earth and rock slopes. Determination of pore pressure at the bottom of each slice 3. Bedrock bedrock rocky flats original landfill geotechnical investigation cross section b 1 cover material unit wt 120 pcf, c 50 psf, phi 30 deg. References required and related publications are listed in appendix a. By looking at the figure 1, gravity acts downwards on the flats surface. Important aspects in slope stability analysis in this section, three major aspects that influence slope stability analysis are discussed. On a flat surface the force of gravity acts downward.
Pdf in this paper the limit equilibrium method of stability analysis of embankments and slopes is. Section a slope stability upper section earth tech material. Accordingly, an important objective of this course is to apply the theory of earth pressures and use the calculated lateral pressures to design earth retaining structures. Such surcharges can include buildings, highways, or railroads. An earth retaining system shall be considered in the situations as follows. Fiksdal, geologist washington department of natural resources division of geology and earth resources olympia, washington 98504 open file report 732 1973. Numerous examples, drawings, and photos enhance the text. Using 2d or 3d finite element computed porewater pressures in slope w makes it possible to deal with highly irregular saturatedunsaturated conditions or transient porewater pressure conditions in a stability analysis. Chapter 4 slope stability universiti teknologi malaysia. Modelling the effectiveness of a soilcement protective cover for slopes 231 m. The results of a slope failure can often be catastrophic, involving the loss of considerable property and many lives. Earth slopes may be formed naturally, as for a hill slope. It also highlights some of the differences in approach to that adopted by the limit equilibrium method of slices. Washington division of geology and earth resources open file report 7618, slope stability map of the uncasport ludlow area, jefferson county, washington author.
It describes the basic rock slope failure modes and methods of analysisboth kinematic and kinetic techniques. The drawdown of reservoirs can significantly affect the stability of upstream slopes of earth dams. Washington division of geology and earth resources open. The nonlinear unified strength theory ust, which takes into account the effect of intermediate stress and nonlinear behavior on geotechnical strength, is applied in slope stability analysis of earth rockfill dams erd in this paper. Weber course content content section 1 retaining walls are structures that support backfill and allow for a change of grade. Stability analysis of slopes of earth dams soil engineering. Stability analysis of homogeneous earth slopes ipcbee. These analyses are often completed using slope stability charts and the dsara deterministic stability analysis for road access slope stability program. Earth embankment dam was analysed and presented, and certain valuable conclusions concerning the overall stability conditions of the earth embankment dam during its original construction are deduced in this research paper. Slope stability refers to the condition of inclined soil or rock slopes to withstand or undergo movement.
Fhwa micropile design and construction 2005 version. Slope stability analyses include static and dynamic, analytical or empirical methods to evaluate the. Slope stability analysis consists of determining and comparing the shear stress developed along the potential rupture surface with the shear strength of the soil. Gravity is the force that acts everywhere on the earth s surface, pulling everything in a direction toward the center of the earth. Its acts everywhere on the earth s surface, and then pulls everything in direction towards the middle of the earth s. There is a proximate liveload surcharge whichmust remain in place. Stability of downstream slope under steady seepage. The study of the stability of existing or natural slopes of earthworks and natural 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. The system uses mechanically stabilized earth mse principles and geotextile technology to create strong and easytoinstall geomodular block structures made up of planter block bags and interlocking plates. The original questionnaire was prepared by constantine g. Slope stability analysis slope w is the leading slope stability software for soil and rock slopes. Determine the required soil reinforcement length and strength, facingsoil reinforcement connection strength, and facing stability in accordance with the plans and this sts. Material and method in order to establish and characterize the problem nature of the slope material in terms of its implications for slope stability, a range of analysis were carried out at the geotechnical laboratory, department of earth sciences, manipur university.
This report describes a proposed procedure and process for implementation of lfrd for slope stability analysis applications, including evaluation of overall stability of earth retaining structures. For instance a retaining wall can be used to retain fill along a slope or it can be used to support a cut into a slope as illustrated in. As soil and rock get buried deeper in the earth, the grains can rearrange themselves to form a more compact structure, but the pore water is constrained to occupy the same space. Special emphasis is placed on the utility and application of stablity formulas, charts, and computer programs developed recently by the author for the analy sis of humancreated slopes. The purpose of this course is to teach engineers, contractors and construction managers the fundamental concepts of slope stability analysis. Slope stability, triggering events, mass movement hazards. Hunter, department of civil engineering, virginia polytechnic institute and state university.
Fhwa nhi06088 6 slope stability soils and foundations volume i 6 3 december 2006 6. Pdf study on slope stability of earthen dams by using. The first is about the material properties of the slope model. When the reservoir on the us side of the earth dam is. The remainder of these guidelines is organized into three different sections. Upstream and ds slopes during and immediately after construction. While utilizing the passive force of earth anchors to resist shear and lateral forces related with soil mobilization, this armoring. This engineer manual em provides guidance for analyzing the static stability of slopes of earth and rockfill dams, slopes of other. Slope stability is an important engineering consideration in earth and rockfill dams, slopes of other types of embankments, excavated slopes, and natural slopes in soil and soft rock. In this case, failure is assumes at a certain plane w sin.
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