Stabilize the upper soil layer on embankments with the 3d geoweb slope protection system to resist sliding, prevent severe erosion caused by surface runoff, and allow steeper slopes to be built. The maximum recommended slope of a randomplaced armor stone revetment is 1. Engineering measures for landslide disaster mitigation mihail e. Oct 20, 2015 vegetation trees, shrubs, grasses, flower and ground covers helps stabilize slopes in numerous ways. End hydraulic problems hydraulic problems highway bridges, designed to resist loads brought by. The actual load imparted is a function of the mass and velocity of the block and the manner in and orientation at which the block impacts the system. Methods for analysis of slope stability are described and are illustrated by examples in the appendixes. Conventional methods of slope stability analysis can be divided into three groups.
Most slope stability analysis computer programs are based on the limit equilibrium concept for a twoor threedimensional model. Slope protection structures help to stablise the slope and can last a lifetime in protecting surrounding properties from damage and people from injury if they are maintained in a good and functional condition at all times. Design of slope protection systems and maintenance procedures to minimize erosion. Sweets provides slope protection product directories to help you construct any building. To evaluate the effect of plant roots on soil shear strength, it is necessary to quantify the biotechnical and mechanical properties of the roots. Vegetation has a great importance in erosion control and slope stabilisation, protecting and restraining the soil at the surface and increasing the strength and competence of the soil mass at depth.
A system of permanent design measures used alone or in combination to minimize erosion from disturbed surfaces. Design of slope protection systems and maintenance procedures. Lecture capture on slope stability, ordinary method of slices and modified simplified bishops method. Native plants provide wildlife habitat, are adapted to our native soils, can adapt better to climate disruptions, and interact with each other in ways hybridexotic plant communities do not. How does the slope angle play a role in slope stability. Selection criteria for slope stabilization methods. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Check and analyze the stability of slopes using various method of analysis and propose the best solution to the problem given. Properly designed slope protection and stabilization has to include two components. Among slope protection methods applied in the past to this type of slope are. What are the different types of slope protection measures in soil. This is important because as the slope becomes saturated with water, its strength and stability. 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.
Vegetation trees, shrubs, grasses, flower and ground covers helps stabilize slopes in numerous ways. On rock slopes, where loss of rock fragments from the face is the prime concern, our macro. Gandhinagar institute of technology presentation on slope protection works civil engineering department presented by. Other systems and methods of fall protection may be used when performing certain activities. This chapter provides further discussion and explanation related to stability of slope.
Temporary slope protection method for shallow or surficial. The erosion mats, biodegradable biomac and the permanent mat macmat provide costeffective methods of retaining both soil and moisture on the slope, thereby promoting sustainable vegetation for longterm erosion protection. The centrifugal forces developed by moving vehicles on. Unlike traditional methods, cc generates no rebound, reduces the need for line or lane possession and can be installed around sensitive infrastructure.
Engineering measures for landslide disaster mitigation. How do friction and cohesion work together to stabilize slopes. Mar 21, 2016 analysis of infinite slope with completely submerged slope if the slope is completely submerged, and if there is no seepage as in fig. Slope stability technical guidance on the geotechnical. Protect geomembranes on dams, landfills, and containment basins with the industrys only complete geocell solution featuring the tendon and. The steepness of the slope will affect the solution chosen. Type of slope failure type of soil presence of groundwater poor drainage slope failure is generally classified as either a rotational slide or a surficial soil creep failure. For maximum effect, both components must be integrally planned prior to road construction. Landslide disaster prevention and mitigation through works. Protection to slope by rigid surface rigid surface protection on slopes are commonly used to reduce rainwater infiltration and to prevent erosion of the slopeforming materials. The weight and dynamic effect of moving load called live load. 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. Slopew can effectively analyze both simple and complex problems for a variety of slip surface shapes, porewater pressure conditions, soil properties, and loading conditions. Water control is generally maintained through installation of surface and subsurface drainage devices within and adjacent to potentially unstable slopes.
Slope face stabilization for critical slope surfaces state of california. Installation of wire mesh on slopes and locking them together. Geotechnically unstable slopes will require additional retention systems or soil nailing to be used in conjunction with our erosion protection solutions. Popescu illinois institute of technology, usa, katsuo sasahara kochi university, japan abstract correction of an existing landslide or the prevention of a pending landslide is a function of a reduction in the driving. Types of slope protection solid mechanics mechanical engineering.
Our erosion slope protection systems provide surface stabilisation alone for geotechnically stable slopes. Protection to slope by rigid surface rigid surface protection on slopes are commonly used to reduce rainwater infiltration and to prevent erosion of the slope forming materials. Shotcrete figures prominently among several methods for slope stabilization due to its versatility, durability, early resistance and its capacity to adhere to adherence to the subtract. Purpose to protect the soil surface from erosive forces andor improve the stability of soil slopes that are subject to seepage or have poor soil structure. Theory of slope stability portland state university. Assuming that the ct saturation will occur for the through fault current then. Lowell washington state department of transportation p. On nearvertical slopes where the mesh is sub parallel to the slope and in limited contact, the rockfall trajectory is generally also sub parallel to the slope. What are the different types of slope protection measures. Because shotcrete is applied pneumatically, the material is compacted against the surface to fill cracks and fissures and prevent loose material from falling. Most rock slopes need some forms of treatment to ensure continued stability. Introduction to landslide stabilization and mitigation. An introduction to slope stability and protection j.
Slope stability publications, software and technical guidance for the career development, information, and resources for geotechnical engineers. Introduction to slope stability and protection course no. The second bias slope is intended to ensure additional restraint with severe through fault currents that could lead to ct saturation. The total weight w of the mass above the trial circle acting through the centre of mass.
Slope protection maccaferri philippines maccaferri. Slope protection products construction materials sweets. Popescu illinois institute of technology, usa, katsuo sasahara kochi university, japan abstract correction of an existing landslide or the prevention of a pending landslide is a function of a reduction in the driving forces or an increase in the available resisting forces. By using well established biotechnical slope protection principles in conjunction with improved erosion control products, erosion control and slope surface stability can be significantly enhanced. Worlds best powerpoint templates crystalgraphics offers more powerpoint templates than anyone else in the world, with over 4 million to choose from.
Types of riparian failure types of riparian protection riprap can fail due to particle erosion, translational slides, slumps and side slope failure riprap should not be used on slopes steeper than 1v. Design guidelines for wire meshcable net slope protection. Slope stability analysis is the property of its rightful owner. Landslide can result either from rock failure or soil failure. Slope failures are essentially natural hazards that occur in many areas over the world. The weight of the structure itself called dead load. Rock slope protection should be implemented only when hydrologic conditions prohibit. Hong kong has a hilly terrain with little flat land. Functions of slope surface protection and earth retaining wall slope protection structures slope protection structures help to stablise the slope and can last a lifetime in protecting surrounding properties from damage and people from injury if they are maintained in a good and functional condition at all times.
Standard and specifications for riprap slope protection definition a layer of stone designed to protect and stabilize areas subject to erosion. Guidelines for the construction of earthfill dams november 2008 1 1. Drainage of water is an effective method of increasing the stability of a slope. Information includes slope stability analysis methods, calculations, illustrations, slope improvement methods, slope stabilization, method of circles, wedge method, bishop, slope mitigation, bearing capacity, foundations, shallow foundations, deep. Ppt slope stability analysis powerpoint presentation. Protection and treatment to rock slope most rock slopes need some forms of treatment to ensure continued stability. Slope stability united states army corps of engineers. 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. What are the different types of slope protection measures in. If so, share your ppt presentation slides online with. Winner of the standing ovation award for best powerpoint templates from presentations magazine.
Where possible, revetment slopes should be selected to match the existing bluffbank slopes stable angle of repose. This user guide provides simple, costeffective methods for stabilizing locally maintained slopes along roadways in minnesota. Temporary slope protection method for shallow or surficial failures. Popularly known as landslides, slope failures describe a wide variety of mechanisms that cause the outward or downward movement of slope forming materials like rock, soil or landfills. 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. Summary of slope treatment methods for stabilization treatment conditions general purpose preventive or remedial change slope geometry reduce height rotational slides preventtreat during early stages reduce inclination all soilrock preventtreat during early stages add weight to toe soils treat during early stages control surface water. Gabions consists of placing wire mesh boxshaped baskets filled onsite with hard, durable rocks sackedconcrete slope protection used when a number of serious failures have occurred. This broad definition encompasses many and varied applications. For an additional 9 years he was a principal advisor to. These approaches should not be considered long term permanent. Types of slope protection free download as powerpoint presentation.
Reinforced soil slopes and embankments for the purposes of this document, a reinforced slope is defined as a compacted fill embankment that incorporates the use of horizontally placed geosynthetic reinforcement to enhance the stability of the soil structure. In the lecture part of this course we will discuss a variety of methods of analysis of slope stability and instability. The main objective of these methods is to reduce the amount of water flowing onto the ground surface in the area of the slide by using a system of plastic sheets and sandbags. Scaling loose blocks or boulders to be removed from exposed rock surfaces, this is usually done by manual method. Slope paving covers a variety of methods for paving slopes, including colored slope paving, exposed aggregate slope paving, and slope paving with concrete pavers.
In the rollout presentation of the riprap design standard, chapter 7, bobby rinehart of. This guide is based on information provided in slope stabilization and repair solutions for local government engineers, which presents the results of a minnesota department of transportation mndot research project on slope stabilization methods. If you have indicators of potentially unstable slopes, call us. Analysis of infinite slope with completely submerged slope if the slope is completely submerged, and if there is no seepage as in fig. Because of the intense urban development, a large number of manmade slopes are formed on hillsides in. Chapter 15 1 slope stability ppt download slideplayer.
Failure modes in rock and soil slopes slope failure. These protection methods, however, produce difficult conditions for initially introduced plants to grow. Temporary slope protection method for shallow or surficial failures the following are general guidelines for minimizing additional movement of shallow or surficial slope failures during the winter months. Theyll give your presentations a professional, memorable appearance the kind of sophisticated look that todays audiences expect.
Design of slope protection systems and maintenance. Deep slope erosion control and embankment stabilization. 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. Removal and protection drainage of water reinforcement. A perfect comprehensive presentation which covers different slope protection method in hard surfaces as well as smooth surface. Slope stability analysis slopew is the leading slope stability software for soil and rock slopes.
To stabilize the soil, to reduce raindrop impact, to reduce the. Osha refers to these systems as conventional fall protection. Generally, fall protection can be provided through the use of guardrail systems, safety net systems, or personal fall arrest systems. Guniting shortcreting application of concrete with force on slopes 1. A simple method to increase slope stability is to increase the weight of the. Impetus to understand analytical methods, investigative tools and stabilization methods. Hattamleh department of civil and environmental engineering washington state university pullman, washington 991642910 thomas c. Frictioncircle method the friction circle method of slope analysis is a convenient approach for both graphical and mathematical solutions. The primary purpose of riprap or other slope protection elements on the upstream slope of an embankment dam is to prevent erosion and damage to the design standard no. Installation of wire mesh on slopes and locking them.
Three site conditions should be considered when choosing an appropriate method for stabilizing a slope. Design guidelines for wire meshcable net slope protection balasingam muhunthan shanzhi shu navaratnarajah sasiharan omar a. Types of slope protection solid mechanics mechanical. Cc can be laid up to 10 times faster than conventional concrete solutions, reducing time on site and asset closures. Water in a slope may come from two primary sources. Department of the interior bureau of reclamation december 2012. Reducing the driving forces and increasing the resisting forces. Protection relays differential relays example d slope 2. Alternative slope protection methods, mentions some alternative methods and references. Design of slope protection systems and maintenance procedures to minimize erosion dennis duffy and hilda hatzell effective control of erosion on highway slopes involves assess ing the ero ive environment correctly, predicting the erosfon resistance of materials before u1eir placement or exposure on. Chunam plastering this is an appliedon surface protection to slope using a clay and cement mixed plaster. Inspect periodically to see if rocks have been dislodged. Ppt slope stability analysis powerpoint presentation free.
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