open pit slope height angle

Geotechnical considerations for the stability of open pit ...

Open Pit Slope Design' (Read & Stacey 2009), are addressed in Chapter 14: Open Pit Closure (van Zyl 2009). The chapter outlines the following typical steps in developing an open pit closure plan: • Develop closure goals and criteria, with local community and other stakeholder engagement. Geotechnical considerations for the stability of open pit

Safety Evaluation on Slope of Saindak Open-pit Mine

4.3. Analysis and calculation of membership grade of slope morphology indexes of Saindak open-pit mine's slope Safety levels of slope morphology of Saindak open-pit mine are shown in Table 5. According to the ridge shape function, membership functions of slope's height and gradient were constructed and calculated. Table 5.

Influence of Slope Curvature on Stability — FLAC3D 7.0 ...

Further, for radii of curvature greater than twice the slope height, the maximum slope angle given by a two-dimensional analysis should be used. The model shown in Figure 1 represents a quarter-section of an open pit. The height of the slope is 25 m, and the slope angle is 2 vertical to 1 horizontal (approximately 63°).

Open pit mine planning considering geomechanical fundamentals

the relation between the slope height and the slope angle based on the steepest and highest slopes at specific open pit mines and to indicate the stable and unstable slopes (Figures 4 and 5). However, these approaches did not recognise the differences in the failure mechanism, which con-trols the rock mass.

Slope Design and Implementation in Open Pit Mines ...

Slope design and implementation in open pit mines; geological and geomechanical approach. Jean-Alain FLEURISSON MINES ParisTech - Centre de Géosciences, 35 Rue Saint Honoré, F -77305 FONTAINEBLEAU Cedex. E-mail: [email protected] Abstract: Slopes in open pit mines must be considered as geotechnical structures.

Research on Slope Stability of a Certain Open-Pit Mine

Research on Slope Stability of a Certain Open-Pit Mine Wang Wuling Institute of Rock and Soil Mechanics, Academia Sinica, Wuhan, ... economical and reasonable angle of slope and the corresponding measures to ensure . ... vaction depth is -96m and slope height is 230m.

Large scale slope stability in open pit mining : a review

Small changes in the overall pit slope angle have large consequences on the overall economy of the mining operation. A case in particular is the Aitik open pit mine in northern Sweden, which currently faces the design of the overall slope angles for continued mining toward a depth of around 500 meters.

PAPER OPEN ACCESS Slope Stability Analysis Under a Complex ...

24-04-2020· The individual slope has a height and angle of 9 meters and 45 degrees, respectively, ... In other words, the top portion of the proposed open pit slopes from the depth of 56-meters down to the depth of -15-meters sea level is predicted to be in stable condition.

Surface mining planning and design of open pit mining

09-01-2016· Fig. 2 illustrates how the pit slopes may vary in the deposit. A proper slope evaluation will give the slope that allows the pit walls to remain stable. The pit walls should be set as steep as possible to minimize the strip ratio. The pit slope analysis determines the angle to be used between the roads in the pit. The overall pit slope used for design must be flatter to allow for the road ...

Selection of practical bench height in open pit mining ...

Key words: Open pit mining, bench height, multi-criteria decision making. INTRODUCTION As a definition in open pit mining, bench height is the vertical distance between crest and toe of the bench (Fourie and Dohm, 1992). Determination of optimum bench height is a major concern in most open pit …

Slope Design and Implementation in Open Pit Mines ...

01-01-2012· This article reminds the principles of slope design in open pit mines, and presents techniques and tools available to address the successive stages of slope design. Their practical implementation is then illustrated by two case studies of open pit mines. * Corresponding author. Tel.: +33 1-6469-4813; fax: +33 1-6469-4711.

Design of Overall Slope Angle and Analysis of Rock Slope ...

In engineering projects associated with rock mechanic science like open pit mines, assessment and slope sta- bility of mine walls is one of the important performance in generate of these structures. Estimating and knowledge of stable slope angle is one of main parts that should be occurring to special attention in open pit mines studies phase.

New slope stability considerations for deep open pit mines

very deep pits. In the past 10 years, open pit planning has ventured into the 'ultra-deep' pit scenario, ... account in this programme: slope angle, slope height and horizontal

SLOPE STABILITY ANALYSIS FOR OPEN PITS 1

The pit wall has an overall slope angle of 37º and a height of 600 metres with an inter-ramp angle of 45º. The main rock types in this domain of the pit are Diorite with a central

Study of Slope Stability (Open Pit Mining, Algeria ...

12-07-2017· The pit is excavated as benches with slope angles of 75° to 85°, 30 m in height, and 10 m in width, (Fig. 2). The depth of the base of mine is 70 m. The thickness of the phosphate layer is about 50 m; the barren covering Consists of a series of Y Persian dolomite limestone with flint, locally Overcome by lutetium limestone, Miocene sands, and quaternary alluvium.

open-pit slope stability - Map Your Show

open-pit slope stability pit-wall stability analysis for open-pit mining Designing the steepest pit-wall angle that is consistant with safety and stability will obtain the best economic result from a mining project. Barr Engineering Co. has more than 40 geotechnical en-gineers and scientists. We assist our clients by …

Pit Wall Angles and Bench Width – How Do They Relate?

10-05-2015· Typically the bench face angle ("BFA") will be dictated by the rock strength, the structural fabric, and whether controlled blasting is used (minimizing damage to …

AN ANOTHER WAY FOR OPEN PIT MINE DESIGN OPTIMIZATION ...

height and width or length presents tangent of the angle of the final slope. III. Every block inside the block model has been ... steeper incline from the dip of the final slope of open pit…

Slope orientation assessment for open-pit mines, using GIS ...

an open-pit slope design: overall slope angle, interramp angle, and bench face angle (Fig. 1). The overall pit slope angle is from crest to toe andincorporates all ramps and benches. The interramp angle of the slope is defined as the slope lying between each ramp. The face angle of individual benches depends on the bench height, or combined ...

Slope Design Considerations for Shallow Open Pit Mines: A ...

03-10-2017· The different aspects that should be considered during the design of slopes in open pit mines are discussed. The paper focuses on the selection of practical bench width and height, bench face angle to match the desired overall slope angle at the study mine and neighbouring mines. Five scenarios were considered during the design.

Pit Slope Design Process - Home - LOP

At that time, few open pit slopes were higher than 300 m and many had been designed on the "45° suck it and see" principle. Failures were relatively common, resulting in loss of life and injuries to workers, as

Application of Blast Damage when Modelling Open Pit Slopes

Reduced influence of 'zoning' the blast damage as: – Slope height increases – Magnitude of blast damage decreases – Slope angle decreases D = 0.7 in 500 m high 45° Slope in Rock Mass A D = 1 in 1000 m high Slope in Rock Mass A Mine to Market Conference: Application of Blast Damage when Modelling Open Pit Slopes 17 Rock Mass B and C Rock Mass B Finite Element Analyses Stability …

Slope Design Criteria for Large Open Pits - Case Study

Height Berm Wdith Batter Angle Overall Angle Haul Road Interramp Angle Interramp Height Overall Height Figure 1 Parameters that define the geometry of an open pit slope Current slope design practices utilise criteria as set out in Table 1. The probability values can be translated to …

How can i determine the open pit mine design parameters ...

How can i determine the open pit mine design parameters such overall slope angle, bench slope angle, bench height, bench width and inter ramp angle?

(PDF) Slope Design and Implementation in Open Pit Mines ...

The results showed that the maximum single slope angle in a safe pit was 52° with a safety factor of 1.266, while the coal reserves obtained with the said slope angle are 29, 965, 008 tons.

Inter-ramp and bench design of open-pit mines: the Portage ...

Open pit slopes terminology (modified from Wyllie and Mah 2004). Nelson et al. (2007) used a geographical information system (GIS) ... on a bench height of 20 m and bench face angles that varied from 70° to 90°. The resulting ultimate pit has a length of 2400 m …

Geotechnical Considerations for Open Pit Design | Earth ...

21-12-2019· The figure below shows the flow chart of the general geotechnical work in an open pit mine. The responsibility of geotechnical engineer is to determine the optimal pit's configuration for the preliminary design. The pit's configuration includes the overall slope angle, inter-ramp slope angle, bench slope angle, bench's height and bench ...