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. The modelled water conditions and acceptance criteria are presented in table 1 below. The stability of a landform surface is a function of many factors. What kinds of rock structures can reduce the stability of slopes. Chapter 10 slope stability analysis nysdot geotechnical page 104 january 21, 2014 design manual 10. How does the slope angle play a role in slope stability. Retaining walls and chapter 730 steep reinforced slopes. 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. The effect of water on cut and fill slope stability is briefly discussed below. Turner and halvorson 20 recommend the upslope batter. The stability condition of slopes is a subject of study and research in soil mechanics, geotechnical engineering and engineering geology.
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. Define the following a angle of repose, b sensitive soils, c hydrocompacting clays, d groundwater, e quick clays. How do friction and cohesion work together to stabilize slopes. 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. 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. This broad definition encompasses many and varied applications. Contents 1 introduction 1 2 terminology 2 types of slopeground failure 2 planar failure 3 wedge failure 4. Slope stability and rockfall hazard analysis in open pit zinc mine. This manual presents the techniques used by allan block in our engineering practice to design retaining walls. Slope stability analysis in three dimensions is more realistic and can advance comprehension of the sliding mechanism. Chapter 11 slope stabilization and stability of cuts and fills. Importance of water next to gravity, water is the most important factor in slope stability. However, that is not to say that all geologists and civil engineers will. 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.
They are certainly major factors in cut slope stability and in. Slope stability audits will form an ongoing subject area of compliance audits going forward and findings from these audits will be communicated to industry. Guideline for batter surface stabilisation using vegetation. Geotechnical assessment of slope stability mornington peninsula. However, if you want to perform a global stability analysis, a slope stability analysis software, such as slopew or slide, is. Site slope constraints po1 section 5 and 6 table 8. Guideline august 1999 geotechnical considerations in open pit mines version 1. It is not intended as a textbook of soil mechanics or geotechnical engineering. Detailed pieziometric data at multiple locations and depths within and below the slope will likely be needed. The subject of slope stability falls within the fields of both geology and civil engineering. Title guideline for batter surface stabilisation using vegetation. In what ways does water added to a slope affect its stability. To assess the possibility of landslides involving natural or existing engineered. 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.
To determine the influence of enumerated factors, the computations of a stability coefficient were per formed for a number of clay slopes using software. Depending upon the site conditions, type of material to be. Pdf slope stability and rockfall hazard analysis in open pit zinc mine. 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 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. They are certainly major factors in cut slope stability and in the stability of fill slopes involving both internal and external slope failures. You can enter any batter angle of the wall face and analyze slope stabilization using soil nails. Methods for analysis of slope stability are described and are illustrated by examples in the appendixes. This type of analysis is also utilized to determine. 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. Slope stability lesson 06 topic 1 stability analysis of slopes.
In the lecture part of this course we will discuss a variety of methods of analysis of slope stability and instability. Slope stability analyses were undertaken for shortterm conditions, longterm conditions, and longterm with seismic conditions. 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. Pdf stability study on the northern batter of mbc open. 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 wall slope system is designed for overall external stability as well as internal stability. Recommendations for specifying and constructing rockeries that are. April 2015 publication of guideline for batter surface stabilisation. 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. The stability analysis of the finished embankment shall demonstrate that it is. The majority of slope designs will be established based on the provisions in this section. For example, typical drystone construction of retaining walls utilizes a 1. Slope stability analyses were carried out for critical sections with respect to embankment height. Slope stability analyses include static and dynamic, analytical or empirical methods to evaluate the stability of earth and rockfill dams.
Planar failure a planar failure occurs along a surface where a block moves downwards along a surface. Geotechnical design standard transport and main roads. For the purposes of this guideline, where a batter has complex shapes or multiple gradients, the selection of a stabilisation technique should be based on the steepest gradient and the longest slope on the given batter. An introduction to slope stability and protection j. For the purposes of this guideline, where a batter has complex shapes or multiple gradients, the selection of a stabilisation technique. The embankment stability was assessed using the morgensternprice method of slope stability analysis. Stability study on the northern batter of mbc open pit using plaxis 3d.
The following main assumptions were made in the stability assessment. The setback gradient line measured from the toe of the slope, or channel assuming the location of the toe remains fixed with time. Geofabrics offers a range of engineered slope, embankment and retaining wall solutions of use in transport infrastructure projects. The remainder of these guidelines is organized into three different sections. To assess the stability of slopes under shortterm often during construction and longterm conditions. The stability analysis of batters may be carried out manually, however, the use of professional software, such as slopew by geoslope.
Fhwa nhi06088 6 slope stability soils and foundations volume i 6 3 december 2006 6. Anglesea mine geotechnical and slope stability technical study. Slope stability depends on many factors like height h and inclination angle. It is commonly required in the construction of hill roads, masonry dams, abutments and wings walls of bridges and so on. Hence from the economic point of view, downslope batter angle is limited to 100.
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. Slope stability verification manual deep excavation llc page 11 e. 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. Design of micropile walls for slope stability improvement.
The length of increases, as the downslope batter angle increases. Soils and foundations testing experience theory lesson 06 chapter 6 slope stability. 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. 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. The landslides caused by two heavy rainfall events are. The bench face angle and berm width geometries must be chosen to fit the bench stack angle but. Global slope stability of the west wall failure through moderately weathered. Slope stability in temporary excavations temporary works. To respond to the different problems associated with instability of rock faces, geofabrics also has a broad range of independently verified rockfall mitigation systems.
The following methodology was undertaken by cardno bowler in order to achieve the objective noted above. Embankment settlement an overview sciencedirect topics. The most significant aspects relating to the slope of a batter are the slope. Overall external stability includes stability of the slope the wallreinforced slope is a part of and the local. The structural elements of the wall or slope and the soil below, behind, andor within the structure are designed together as a system. What is the factor of safety and how does it apply to slope stability. For an additional 9 years he was a principal advisor to.
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