The majority of slope designs will be established based on the provisions in this section. To determine the influence of enumerated factors, the computations of a stability coefficient were per formed for a number of clay slopes using software. 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. It is commonly required in the construction of hill roads, masonry dams, abutments and wings walls of bridges and so on. 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. Global slope stability of the west wall failure through moderately weathered. The setback gradient line measured from the toe of the slope, or channel assuming the location of the toe remains fixed with time. 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. What is the factor of safety and how does it apply to slope stability. Slope stability refers to the condition of inclined soil or rock slopes to withstand or undergo movement. This type of analysis is also utilized to determine. April 2015 publication of guideline for batter surface stabilisation.
For an additional 9 years he was a principal advisor to. In the lecture part of this course we will discuss a variety of methods of analysis of slope stability and instability. Slope stability verification manual deep excavation llc page 11 e. Erosion, driven by gravity, is the inevitable response to that uplift, and various types of erosion, including mass wasting, have created slopes in the uplifted regions. Guideline august 1999 geotechnical considerations in open pit mines version 1. In recognition of his years of guidance and support as a mentor and friend to geotechnical specialists in the northwest, we dedicate these volumes, a summary of what we have. The wall slope system is designed for overall external stability as well as internal stability. Methods for analysis of slope stability are described and are illustrated by examples in the appendixes. An introduction to slope stability and protection j. Construct cut and fill slopes that are flat enough to be.
In what ways does water added to a slope affect its stability. Pdf holcim nz limited distribution 1 copy geoscience consulting. Slope stability depends on many factors like height h and inclination angle. To ensure that the wall does not have a negative slope or batter slope outward from guardrail installation at no additional expense to the department. Retaining walls and chapter 730 steep reinforced slopes. They are certainly major factors in cut slope stability and in. Slope stability analyses were undertaken for shortterm conditions, longterm conditions, and longterm with seismic conditions. Determine the required soil reinforcement length and strength, facingsoil reinforcement connection strength, and facing stability in accordance with the plans and this sts.
The aims of slope stability analyses are to understand the development and form of natural slopes and the processes responsible for different natural features. The following methodology was undertaken by cardno bowler in order to achieve the objective noted above. Fhwa nhi06088 6 slope stability soils and foundations volume i 6 3 december 2006 6. The embankment stability was assessed using the morgensternprice method of slope stability analysis. Contents 1 introduction 1 2 terminology 2 types of slopeground failure 2 planar failure 3 wedge failure 4. The applicant needs to assess the risk of landslide which may adversely affect the. The most significant aspects relating to the slope of a batter are the slope gradient and the slope length. However, if you want to perform a global stability analysis, a slope stability analysis software, such as slopew or slide, is. You can enter any batter angle of the wall face and analyze slope stabilization using soil nails. The stability condition of slopes is a subject of study and research in soil mechanics, geotechnical engineering and engineering geology. The stability analysis of the finished embankment shall demonstrate that it is. How do friction and cohesion work together to stabilize slopes. However, that is not to say that all geologists and civil engineers will.
Chapter 11 slope stabilization and stability of cuts and fills. City plan policy geotechnical stability assessment major update to city plan policies schedule 6 draft for adoption page 2 of 11 f emergent seepages and depth of groundwater table. The bench face angle and berm width geometries must be chosen to fit the bench stack angle but. For a bench stack angle that satisfies the stability criteria, various combinations of bench height, bench face angle and berm width can be used in the slope design. Stability study on the northern batter of mbc open pit using plaxis 3d. The following main assumptions were made in the stability assessment. Depending upon the site conditions, type of material to be. To assess the stability of slopes under shortterm often during construction and longterm conditions. Slope stability and rockfall hazard analysis in open pit zinc mine. Title guideline for batter surface stabilisation using vegetation. The stability analysis of batters may be carried out manually, however, the use of professional software, such as slopew by geoslope. The effect of water on cut and fill slope stability is briefly discussed below. The landslides caused by two heavy rainfall events are. It is not intended as a textbook of soil mechanics or geotechnical engineering.
Planar failure a planar failure occurs along a surface where a block moves downwards along a surface. What kinds of rock structures can reduce the stability of slopes. Soils and foundations testing experience theory lesson 06 chapter 6 slope stability. This broad definition encompasses many and varied applications. Importance of water next to gravity, water is the most important factor in slope stability. The remainder of these guidelines is organized into three different sections. Slope stability audits will form an ongoing subject area of compliance audits going forward and findings from these audits will be communicated to industry. For the purposes of this guideline, where a batter has complex shapes or multiple gradients, the selection of a stabilisation technique. For example, typical drystone construction of retaining walls utilizes a 1. To respond to the different problems associated with instability of rock faces, geofabrics also has a broad range of independently verified rockfall mitigation systems. Design of micropile walls for slope stability improvement.
Slope stability in temporary excavations temporary works. Slope stability lesson 06 topic 1 stability analysis of slopes. 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. Chapter 10 slope stability analysis nysdot geotechnical page 104 january 21, 2014 design manual 10. Anglesea mine geotechnical and slope stability technical study introduction alcoa s anglesea mine is located at anglesea, in south western victoria, approximately 35 kilometres from geelong. Geotechnical assessment of slope stability mornington peninsula. The modelled water conditions and acceptance criteria are presented in table 1 below. Geotechnical stability assessment city of gold coast.
The batter angle is typically described as a ratio of the offset and height or a degree angle that is dependent on the building materials and application. Turner and halvorson 20 recommend the upslope batter. Geofabrics offers a range of engineered slope, embankment and retaining wall solutions of use in transport infrastructure projects. How does the slope angle play a role in slope stability. Geotechnical design standard minimum requirements websitem. The length of increases, as the downslope batter angle increases. Define the following a angle of repose, b sensitive soils, c hydrocompacting clays, d groundwater, e quick clays. Overall external stability includes stability of the slope the wallreinforced slope is a part of and the local. The subject of slope stability falls within the fields of both geology and civil engineering. Retaining walls may be defined as a wall built to resist the pressure of liquid, earth filling, sand, or other granular material filled behind it after it is built. Embankment settlement an overview sciencedirect topics. They are certainly major factors in cut slope stability and in the stability of fill slopes involving both internal and external slope failures. Hence from the economic point of view, downslope batter angle is limited to 100.
The stability of a landform surface is a function of many factors. Guideline for batter surface stabilisation using vegetation. Slope stability analyses were carried out for critical sections with respect to embankment height. As nouns the difference between slope and batter is that slope is an area of ground that tends evenly upward or downward while batter is a beaten mixture of flour and liquid usually egg and milk, used for baking eg pancakes, cake, or yorkshire pudding or to coat food eg fish prior to frying or batter can be an incline on the outer face of a built wall or batter can be the person. Pdf stability study on the northern batter of mbc open. The most significant aspects relating to the slope of a batter are the slope. Geotechnical design standard transport and main roads. Site slope constraints po1 section 5 and 6 table 8. Detailed pieziometric data at multiple locations and depths within and below the slope will likely be needed. Slope stability analysis in three dimensions is more realistic and can advance comprehension of the sliding mechanism.
This manual presents the techniques used by allan block in our engineering practice to design retaining walls. This method of slope stability analysis is not widely used since it has been found that plane surfaces of sliding are observed only with very steep slopes, and for. Anglesea mine geotechnical and slope stability technical study. The anglesea mine supplied brown coal to the anglesea power station since its inception in 1969 until shutdown in august 2015. Pdf slope stability and rockfall hazard analysis in open pit zinc mine. 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.
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