Slope stability analysis by the limit equilibrium method. The typical geotechnical rock mass profile of the ter rain is divided into two. Abstract in this paper, the effect of length of rock bolts on the stability of rock slopes was investigated. The cuajone porphyry copper deposit is located on the western slopes of cordillera occidental, in the southern andes of peru. You can specify water pressure, material shear strength, surface loads and horizontal ground acceleration.
The user interface and analysis options are almost identical to the generalised slope analys is module except for the ability to define a slip surface of any general shape. Slope stability best slope stability analysis software. The mechanical anchor bolt consists of a smooth bar with a threaded anchor end. Slope stability analysis of soil slopes using the nonvertical slice method proposed by sarma noncircular slip. Rock slope stability analysis a variety of engineering activities require excavation of rock cuts. Developed by the makers of geo5, the easytouse free software ensures all the details of your project are accounted for while the robust input options allow for extremely precise geotechnical modeling. The aim of the chapter of this engineering manual is to explain a rock slope stability situated in a. Rock slope stability analysis lec 1 linkedin slideshare. Rock slope design guide page 11 section 100 rock slope design background 101 introduction this manual is intended to provide guidance for the design of rock cut slopes, rockfall catchment, and rockfall controls. Plaxis software, abaqus software, geoslope software are commercial licence software or in other terms, you have to pay a lot of money for a regular full licence. Rs2 can be used for a wide range of engineering projects and includes excavation design, slope stability, groundwater. This essential slope software analyses reinforcing elements such as soil nails, rock bolts, ground anchors and geotextiles to bs8006bs8081.
The incredible ibex defies gravity and climbs a dam forces of nature with brian cox bbc duration. Not all slope stability software is real expensive. Robust geotechnical design of rock bolts for stability. Rock bolts jointed or sheared rock preventtreat sliding slabs concrete straps and bolts heavily jointed or soft rock prevent cable anchors dipping rock beds preventtreat during early stages wire meshes steep rock slopes contain falls concrete impact walls moderate slopes contain sliding or rolling blocks shotcrete soft or jointed rock prevent. Robust geotechnical design of rock bolts for stability of. Modem methods for design and stabi lization of rock. Ground support design ground support design is a key subdiscipline of underground rock engineering and forms part of the overall ground control measures that are a vital part of all underground mining and subsurface civil engineering projects. All types of soil and rock slopes, embankments, earth dams and retaining walls can be analyzed.
Asuccessful rock slope stabilization program requires the integration of a. Geotechnical midas engineering software structural. Uncertainty in input parameters that determine the stability of rock slopes may lead to uncertainty in evaluating the factor of safety. Software for slope stability analysis slope stability. A new nonlinear hoekbrown strength reduction method based on the characteristics of a jointed rock mass is proposed. May 06, 2011 slope stability stabilization techniques stabilization through support ground inclusions ground anchor soil nails rock bolt ground inclusion. How do friction and cohesion work together to stabilize slopes. Reliabilitybased robust geotechnical design of rock bolts. Stability calculation method of slope reinforced by.
Roctopple is an interactive software tool for performing toppling analysis and support design of rock slopes. Also included in the document are two detailed design examples and technical specifications for ground anchors and for anchored walls. The example of rock bolts design for slope stabilization is used. General purpose re sponse surface as a surrogate model to. The most serious disorders which can occur in slopes are 1 the sliding of blocks along the discontinuing surfaces which exist at the opening of trenches and 2 rock falls or sliding of blocks resulting from the rapid change in the mechanical characteristics of the rock bench which supports them. Slope design at cuajone pit, peru s rk chiles rock mechanics team completed a study of the slope design at cuajone pit. The effect of length of rock bolts on the stability of rock. Mar 07, 2019 tutorial on the basic use of slide software for slope stability analysis. Discontinuities are geologic breaks such as joints, faults, bedding planes, foliation, and shear zones that can. Study of effect of bolt anchorage parameters on rock slope stability by. Rockpack iii rockware rockware geoscientific software.
To study the effect of installation angle of rock bolts on the stability of rock slopes, the slopes in different dips such as 30, 45, 60, and 75 were modeled by phase2 software rocscience, 1999. Slide 2d limit equilibrium slope stability analysis software. Aug, 2017 the incredible ibex defies gravity and climbs a dam forces of nature with brian cox bbc duration. Geotechnical design software slope stability analysis of rocky. Plaxis software, abaqus software, geo slope software are commercial licence software or in other terms, you have to pay a lot of money for a regular full licence. The graphics and the pointandclick data input are also very good and makes the program very easy to use. General purpose response surface as a surrogate model to. The effect of spacing of rock bolts on the stability of.
Rock slope stability analyses are routinely performed and directed towards assessing the safe and functional design of excavated slopes e. Slope stability analysis slope w is the leading slope stability software for soil and rock slopes. Rock3d geotechnical design software slope stability. Factor of safety of slope is evaluated using commercial software phase2d. Context sensitive rock slope design solutions fhwa us. This engineer manual em provides guidance for analyzing the static stability of slopes of earth and rock fill dams, slopes of other types of embankments, excavated slopes, and natural slopes in soil and soft rock. Dowels are used on steep slopes in the same fashion as rock bolts, while shear pins are used on. By increasing the distance of rock bolts, the strength. The effect of installation angle of rock bolts on the stability of rock.
Rock slope stability analysis utilization of advanced. Bolting, trans tech publications, series on rock and soil. When a torque is applied to the bolt, the force drives a plug against the outer shell, which then expands and sets against the rock in the borehole walls figure 22. Study of effect of bolt anchorage parameters on rock slope stability. A multiobjective optimization is used to identify a set of robust designs. Conclusion in this research that with aim to analysis the effect of spacing of rock bolts on the stability of rock slopes is done the following results are obtained. Rocplane is a software tool for planar rock slope stability analysis and design. Slope w can effectively analyze both simple and complex problems for a variety of slip surface shapes, porewater pressure conditions, soil properties, and loading conditions. Is there any free software available for slope stability. Redirock wall freeware is a robust software tool for geotechnical engineers to design and analyze cross sections of redirock gravity walls. The effect of spacing of rock bolts on the stability of rock. Rocplane contains many helpful features that allow users to.
The limit equilibrium method is the most common approach for analyzing slope stability in both two and three dimensions. The fully grouted bolt is a convenient, effective, and economic technology for slope reinforcement. Rocplane is an interactive software tool for performing planar rock slope stability analysis and design. Design and analyze planar rock slopes with rocplane, a quick and easy tool to help you build planar models and visualize them in 2d and 3d.
College of engineering, ahmedabad, india abstractthe slope stability is a very important problem in geotechnical engineering. Given the size of blocks and the maximum lenght for the bolt. Stability calculation model of frame supporting structure with prestressed anchor. Rocplane contains many helpful features that allow users to rapidly build, modify and run models. In the models, the pattern of parallel deterministic joints was used in spacing of 2. Integrated computer aided stability analysis and rock bolting design for underground excavations.
Stability analysis of bolts reinforced rock jointed slope. Ge, principal consultant with gregory geotechnical gregeo. The first analysis should be done in the slope stability program, where the active an. By analyzing the change in slope failure mode, effects of the bolt head, spacing, inclination, and arrangement on the stability of the slope are investigated. Roctopple makes it easy to visualize the slope failure in both 2d and 3d. Rocplane planar sliding stability analysis for rock slopes. Rock3d is a program for stability analysis of removable blocks on planar rock slopes. Figure 43 depicts a rock slope stability analysis diagram assuming a tension crack in the slope. The diagram shows the values of srf for the slope with dip of 75 degrees and different spacing of rock bolts that were installed at different angles the diagrams in figs.
For this purpose, the rock slopes with different dips in jointed schist rocks were modeled using the phase2 software and their stability were determined using the. Proper ground support design is essential for the safety and productivity of underground mines and civil engineering projects. Rockbolting design is indeed mainly based on experience and it appears that rockbolting design is simply a business of selection of rockbolt types and the determination of bolt length and spacing, but, one essentially uses, either explicitly or implicitly, a methodology. Recommendations presented in this manual are based on research presented in shakoor. The criterion now incorporates both intact rock and discontinuities, such as joints, characterized by the geological strength index gsi, into a system designed to estimate the mechanical behaviour of typical rock masses encountered in tunnels, slopes and foundations. Based on the failure mode of soil slope, it takes the soil, frame structure, and anchor rod rope interaction into consideration, and, according to the literature, for soil slopes and largescale rock slope structure circular sliding method is appropriate. Rockpack iii is a package of programs useful for all phases of rock slope analysis and design where stability is controlled by the orientations and characteristics of rock mass discontinuities joints, bedding, foliations, faults, etc. Designing, constructing and monitoring of slopes in rock. In the models, the pattern of parallel deterministic joints was used in spacing of 2 meters. The hoekbrown failure criterion and gsi 2018 edition. What is the best software to analyse the slope stability. Rock slope design guide ohio department of transportation.
Methods of reinforcement and monitoring based on the above calculations, the slope stability expert will design the slope angles in order to ensure the desired level of stability. At cut design, stability analysis for the failure through the rock mass, plane and wedge failure and. It is a metal bar that is driven or drilled into competent bedrock rock which is not highly fractured or broken up to a provide stable foundation for structures such as retaining walls and piles, or. Kinematic analysis is a method used to analyze the potential for the various modes of rock slope failures plane, wedge, toppling failures, that occur due to the presence of unfavorably oriented discontinuities figure 1.
Different scenarios incorporating or not reinforcement systems surface water drainage, rock mass dewatering, mechanical reinforcement using rock bolts and. Including calculations for bolt diameter, bond length, bolt length, bearing plates, number of bolts for block stabilization. The effect of installation angle of rock bolts on the. There are two types of untensioned anchors used in rock stabilization. Create planar models, visualize them in 2d and 3d, and evaluate results. Tutorial on the basic use of slide software for slope stability analysis. Slope stability analysis must take into account a variety of factors relating to topography, geology and material properties, often associated to whether the slope was naturally formed or engineered. The software in general is very good and ties in well with the way we do things here.
The hoekbrown criterion was introduced in 1980 to provide input for the design of underground excavations in rock. In civil engineering, projects include transportation systems such as highways and railways, dams for power production and. A process of the unstable 3d rock wedge stabilization design is described later on the. Slope stability analysis slopew is the leading slope stability software for soil and rock slopes. Dave2 1pg student 2professor 1,2department of applied mechanics 1,2l. Fundamentals and methods presents basic principles for the safe design of constructed or natural earth slopes. Soilworks is designed for structural engineers with a background in geotechnical engineering and geotechnical engineers with a background in finite elements. Redi rock wall freeware is a robust software tool for geotechnical engineers to design and analyze cross sections of redi rock gravity walls. Make sure you understanding the different input parameters between rock slope, soil. A mechanical shell anchor attached to the threaded end of the bolt is used to anchor the system. Rockbolt is the most widely used support element in support systems in underground mines and civil tunnels. I am seeking an example or reference that goes through the design for a cliff face that needs to be spot stabilized with rock bolts. Rocplane makes it easy to quickly create planar models, visualize them in both 2d and 3d, and evaluate analysis results. Stability of rock slopes in many civil engineering projects involves installation of rock bolts for stabilization.
Slope stability stabilization techniques stabilization through support ground inclusions ground anchor soil nails rock bolt ground inclusion. This program is used for design of pile walls stabilizing slope movement or increasing safety factor of the slope. Slopew can effectively analyze both simple and complex problems for a variety of slip surface shapes, porewater pressure conditions, soil properties, and loading conditions. Designing, constructing and monitoring of slopes in rock mass in. Also, the joints all over the slopes have the same. Slope checks a range of slip circles and gives you the option to force slips through a point or. The rgd methodology is utilized to achieve a certain level of design robustness against the uncertainty in the estimated statistics of rock properties, in addition to meeting safety and cost requirements. Once the geometry of the rock blocks has been identified, the bolt forces necessary. Slide is the most comprehensive slope stability analysis software available, complete with finite element groundwater seepage analysis, rapid drawdown, sensitivity and probabilistic analysis and support design. Designing, constructing and monitoring of slopes in rock mass. For specific slope, stability analysis can be performer by utilize slide software from rock science or plaxis. It identifies and analyses all the blocks that have formed under each kinematic mode.