Costeffective and sustainable road slope stabilization and. Completion of soil mechanics module i, soil classification, or the equivalent. Dowel a hole is drilled and provide untensioned steel bars, usually 25mm to 35mm dia. Theory of slope stability portland state university. Slope stabilization a number of methods have been used to stabilize slopes, each of them found. Slope stability and protection continuing education for. The soil containing the setting agent may be fibersoilcement which provides a satisfactory bed to grow plants as well as protection of the slope surface 1. Field engineers and design engineers involved in slope stability analysis for earth embankments, streambanks, excavated slopes, and landslide stabilization, as well as in contracting out of this kind of work to outside. Paul guyer is a registered mechanical engineer, civil engineer, fire protection engineer and architect with over 35 years experience in the design of buildings and related infrastructure. Second, the basic mechanics applied to estimate the stability of a cut slope in soil are the same as those used to estimate the stability of a fill slope. Using and, which were calculated using jakys formula, formula 10.
For more free video tutorials covering slope stability and soil mechanics. What are the different types of slope protection measures in soil. A new calculation method for the soil slope safety factor. The classification of rock and soil slopes is based on the mode of failure. Design of slope protection systems and maintenance procedures to minimize erosion. Costeffective and sustainable road slope stabilization and erosion control presents information on costeffective and sustainable road slope stabilization techniques, with a focus on shallow or nearsurface slope stabilization and related erosion control methods used on lowvolume roads. Soil mechanics, bearing capacity and slope stabilization. This discussion presents methods of analyzing stability of natural slopes and. The probabalistic sara stability analysis for road access program is still under development. Slope stability analyses include static and dynamic, analytical or empirical methods to evaluate the. Ce6405 notes pdf free download soil mechanics notes. They must have a thorough mastery of soil mechanics and soil strength, a solid understanding of the computer. Nov 18, 2014 the contents include identification and classification of soil and rock, field exploration, testing, and instrumentation, laboratory testing, distribution of stresses including pressures on buried structures, analysis of settlement and volume expansion, seepage and drainage, and slope stability and protection. More robust fabrics, such as cable nets, have more recently been introduced to improve the capacity of these rockfall protection systems.
Unit v slope stability 9 ce8491 syllabus sm soil mechanics infinite slopes and finite slopes friction circle method use of stability number guidelines for location of critical slope surface in cohesive and c soil slope protection measures. Fhwa nhi06088 6 slope stability soils and foundations volume i 6 2 december 2006 figure 61. In this way, the book gives a clear and comprehensive picture of the special fields of soil mechanics and its subjects. Chapter 8 slope stability and protection pile buck magazine. Trbs national cooperative highway research program nchrp synthesis 430. The two categories of slopes are ones occurring naturally and those that are manmade, which include landfills, open pit mining and road cuts to name but a few. Rock slope protection can be used with a variety of bmps to break up the system rather than. Written by worldleading geotechnical engineers who share almost 100 years of combined experience, slope stability and stabilization, second edition assembles the background information, theory, analytical methods, design and construction approaches, and practical examples necessary to carry out a complete slope stability project. Fs slope stability analysis geotechnical design manual m 4603 chapter 74 december 2006 slope stability analysis. Slope stability technical guidance on the geotechnical. Viswanadham,department of civil engineering,iit bombay. Changing slope geometry 3 cut slopes in soils thin soil cover over rock.
Mod05 lec40 lecture 1 on stability of slopes youtube. Soil mechanics of earthworks, foundations and highway. For a complete version of this document click here. Chapter 18, soil bioengineering for upland slope protection and erosion reduction is one of the 18 chapters of the u. Chapter 8 slope stability and protection pile buck.
The effectiveness of each slope stabilization method is assessed using principles of unsaturated soil mechanics. Osha recently revised subpart p, excavations, of 29 cfr 1926. The stability condition of slopes is a subject of study and research in soil mechanics, geotechnical engineering and engineering geology. Conventional methods of slope stability analysis can be divided into three groups. Ce6405 notes soil mechanics regulation 20 anna university free download. Overstressing of a slope or reduction in shear strength of the soil may. Installation of wire mesh on slopes and locking them together. Pdf unsaturated soil mechanics for slope stabilization. May 04, 2017 for a complete version of this document click here. Remove the upper soils of the slope to create a flatter slope. Benching the slope if each bench is on competent subgrade.
Removal and protection drainage of water reinforcement. These analyses are often completed using slope stability charts and the dsara deterministic stability analysis for road access slope stability program. Understand key properties of soil, including soil permeability and compressibility. Erosion control with ebs engineered base stabilizer ebs provides effective erosion control short medium or long term. Some earthwork mitigation techniques are as follows.
Earthwork the steeper the slope, the more prone it is to fail. A layer of loose rock or aggregate placed over an erodible soil surface. Stability of slopes for excavations in different soil types. Types of slope protection solid mechanics mechanical. Introduction to slope stability soil mechanics youtube. The failure process of a soil slope as shown in fig. Slope protection works for soft surface hydro seeding turfing plant growth 16. Analysis and design of wire meshcable net slope protection. What are the different types of slope protection measures in. The long slope of the face of a mountain is an example of this type, whereas finite slopes are limited in extent. In all three methods, the material should be placed with the butt ends slightly dipping into the fill 20 percent and the tips protruding a few centimeters. Selection criteria for slope stabilization methods. Soil solutions provides a long term sustainable guaranteed solution that significantly decreases costs on any erosion control project. One application of ebs will last from 3 months to 10 years pending the material and recommended application rate.
Guniting shortcreting application of concrete with force on slopes 1. Ce8491 syllabus soil mechanics regulation 2017 anna university. Since the 1950s, heavy gage wire mesh has been used along north american highways to control rockfall on actively eroding slopes. For an additional 9 years he was a principal advisor to. The simplest and most cost effective means of stabilizing bare soil surfaces is through the use. Pdf a slope stability case study by limit equilibrium and.
Slope can collapse easily by shear if the soil is nearly. Buttress the slope toe by filling with rock, gravel or soil. Pdf a slope stability case study by limit equilibrium. It is inevitable to excavate slide slope and damage rock slope under the rapid development of expressway. This course is designed to supplement the theory and practice of soil mechanics that you learn in courses taught in civil engineering. Osha will allow only rock to be cut vertically without worker protection. Mar 04, 2019 the analyses of slope stability are based on simplifying assumptions, and the design of a stable slope relies heavily on experience and careful site investigation. Download link is provided and students can download the anna university ce8491 soil mechanics sm syllabus question bank lecture notes part a 2 marks with answers part b marks and part c 15 marks question bank with answer, all the materials are listed below for the students to make use of it and score good maximum marks with our study materials. Where a natural vegetated slope is required, simply placing top soil on a sterile slope is often not sufficient and topsoil layers are seen slumped at the base of newly constructed slopes. Time during which the excavation is required to be open. Louies ungria soil slope unrestrained slope is an exposed ground surface that stands at an angle with the horizontal the slope can be natural or constructed.
Civil engineering embankment slope protection with drain system duration. An introduction to slope stability and protection j. Determine bearing capacity and know how to increase it through draining and compaction. Slope stability assessment and mitigation soil mechanics. Goel, in engineering rock mass classification, 2011. Soilrock transition hard residual soils to weathered rock are often excavated to between 1h. Soil tends to fail in shear, these concepts directly govern slope failures. Various types of slope surface protection surface drains to channel surface runoff water away from slope turfing to protect the slope surface from soil erosion stone pitching shotcrete weepholes. The fellenius slice method and bishop formula were used to calculate the slope safety factor.
Department of agriculture natural resources conservation service nrcs engineering field handbook, previously referred to as the engineering field manual. Allowable degree of risk of slipping which is determined based on the existing structures and new constructed buildings around the. Embankments for the storage of water for irrigation, as attested to both by historians and archaeologists, have been used since the early days of civilization. Standard designs have been developed on the basis of soil mechanics and past performance.
Some of the structures built in antiquity were of considerable size. Design of slope protection systems and maintenance. Infinite slopes and finite slopes friction circle method use of stability number guidelines for location of critical slope surface in cohesive and c soil slope protection measures click below link to download soil mechanics syllabus notes question papers question banks 2 marks with answers part b questions with answers download. The term infinite slope is used to designate a constant slope of infinite extent. The failed soil mass can move very quickly over large distances. To further remedy ecological environment, correct understanding of side slope stability is essential for the effective reinforcement and protection of rocksoil slope. The stability condition of slopes is a subject of study and research in soil mechanics, geotechnical. What are the different types of slope protection measures.
This section presents methods of analyzing stability of natural slopes and safety of embankments. Soil mechanics slope stability most trail construction should take place on slopes, not flat ground, and should proceed with the best practices of road construction engineering, yet depending on the user groups it wont have quite the same load requirements or factors of safety required for roads local requirements or regulations pending. Slope height m, slope angle, soil gravity knm3, angle of soil internal friction, and cohesion kpa were known. Effects of soil parameters and groundwater on stability. The fibersoilcement is a mixture of sand or sandy soil as the main ingredient, cement as the setting agent and a fiber admixture as basic materials for the growth of plants. Pdf investigation of slope failures in soil mechanics. In the majority of cases, the slope failures in rock masses are governed by joints and occur across surfaces formed by one or several joints. A slope stability case study by limit equilibrium and finite element methods. Soil slope stability analysis using the friction circle. Costeffective and sustainable road slope stabilization. Soil has shear strength, conventionally defined as friction and cohesion.
Slope stability analyses include static and dynamic, analytical or empirical methods to evaluate the stability of earth and rockfill dams, embankments. The soil should be removed or retained as the condition is unstable. Chapter 18 soil bioengineering for upland slope protection. A slope failure adjacent to a roadway is shown in figure 16. Slope stability is the primary means of quantitatively assessing the level of stability of a slope, done using a factor of safety. Diagrams are included for stability analysis, and procedures for slope stabilization are discussed. The first step utilizes the results of conventional slope stability analysis. Standards for soil erosion and sediment control in new jersey may 2012 251 standard for slope protection structures definition structures to safely conduct surface runoff from the top of a slope to the bottom of the slope.
Performance of rocksoil slope reinforcement and protection. The slopes of embankments and earth dams are examples of finite. Investigation of slope failures in soil mechanics article pdf available in electronic journal of geotechnical engineering 17bund. In this simulation, the transverse direction of the computational model is constrained to yield a plane strain state 120.
Application of slope purpose of stabilizing time available accessibility of the site types of construction equipment, and the cost of repair these methods can be classified into three categories removal and protection drainage of water reinforcement. The analyses of slope stability are based on simplifying assumptions, and the design of a stable slope relies heavily on experience and careful site investigation. Stability of slopes in open excavation in different soil condition along with the factors that control slope stability in open excavation are discussed. Sheet piling retaining walls sheet piling in the soil. The contents include identification and classification of soil and rock, field exploration, testing, and instrumentation, laboratory testing, distribution of stresses including pressures on buried structures, analysis of settlement and volume expansion, seepage and drainage, and slope stability and protection. This 6 pdh online course is intended for civil and geotechnical engineers and other infrastructure design and construction professionals who want to learn about the basic technology, design guidelines and materials and equipment used for analysis of slope stability and protection methods. Ledlie klosky for furnishing the improved version of dm 7. Design and construction of soil slopes transportation research. This consists of the decoupling of the slope geometry from the computation of pile lateral capacity, which allows numerical simulation of only a limited region of soil around the piles. Dec 31, 2015 advanced geotechnical engineering by dr. Pdf ce8491 soil mechanics sm books, lecture notes, 2. Types of slopes natural, artificial, infinite, finite slopes.
May 14, 2019 infinite slopes and finite slopes friction circle method use of stability number guidelines for location of critical slope surface in cohesive and c soil slope protection measures click below link to download soil mechanics syllabus notes question papers question banks 2 marks with answers part b questions with answers download. For example, the first chapter deals not only with the stability of slopes, but also discusses the natural and artificial effects, slope protection, filter design, stresses in embankments, and the time factor. Ce6405 notes soil mechanics regulation 20 anna university. Soil mechanics of earthworks, foundations and highway engineering.
Introduction to slope stability and protection cedengineering. Slope can collapse easily by shear if the soil is nearly saturated and. Slope stability refers to the condition of inclined soil or rock slopes to withstand or undergo movement. In this way, the book gives a clear and comprehensive picture of. Overstressing of a slope or reduction in shear strength of the soil. In this video we introduce the concept of slope stability as.
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