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 design at cuajone pit, peru s rk chiles rock mechanics team completed a study of the slope design at cuajone pit. Factor of safety of slope is evaluated using commercial software phase2d. The hoekbrown criterion was introduced in 1980 to provide input for the design of underground excavations in rock.
All types of soil and rock slopes, embankments, earth dams and retaining walls can be analyzed. Rock slope stability analysis utilization of advanced. 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. 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. Slope stability stabilization techniques stabilization through support ground inclusions ground anchor soil nails rock bolt ground inclusion. 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 critical strength reduction factor srf of slopes.
Mar 07, 2019 tutorial on the basic use of slide software for slope stability analysis. Is there any free software available for slope stability. May 06, 2011 slope stability stabilization techniques stabilization through support ground inclusions ground anchor soil nails rock bolt ground inclusion. Stability of rock slopes in many civil engineering projects involves installation of rock bolts for stabilization. Slope stability, slope stability analysis deep excavation. Rockbolt is the most widely used support element in support systems in underground mines and civil tunnels. Discontinuities are geologic breaks such as joints, faults, bedding planes, foliation, and shear zones that can. 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. 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. There are two types of untensioned anchors used in rock stabilization. Different scenarios incorporating or not reinforcement systems surface water drainage, rock mass dewatering, mechanical reinforcement using rock bolts and.
The software in general is very good and ties in well with the way we do things here. 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. The graphics and the pointandclick data input are also very good and makes the program very easy to use. The cuajone porphyry copper deposit is located on the western slopes of cordillera occidental, in the southern andes of peru. This essential slope software analyses reinforcing elements such as soil nails, rock bolts, ground anchors and geotextiles to bs8006bs8081. The effect of spacing of rock bolts on the stability of rock. The effect of installation angle of rock bolts on the stability of rock. In the models, the pattern of parallel deterministic joints was used in spacing of 2 meters. The incredible ibex defies gravity and climbs a dam forces of nature with brian cox bbc duration.
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. 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. Slope stability analysis slopew is the leading slope stability software for soil and rock slopes. The limit equilibrium method is the most common approach for analyzing slope stability in both two and three dimensions.
How do friction and cohesion work together to stabilize slopes. Rocplane makes it easy to quickly create planar models, visualize them in both 2d and 3d, and evaluate analysis results. Modem methods for design and stabi lization of rock. 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. Designing, constructing and monitoring of slopes in rock.
General purpose response surface as a surrogate model to. Redi rock wall freeware is a robust software tool for geotechnical engineers to design and analyze cross sections of redi rock gravity walls. 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. Slope stability analysis by the limit equilibrium method. It identifies and analyses all the blocks that have formed under each kinematic mode. Bolting, trans tech publications, series on rock and soil. Make sure you understanding the different input parameters between rock slope, soil. Rock slope stability analysis lec 1 linkedin slideshare. Roctopple is an interactive software tool for performing toppling analysis and support design of rock slopes. Recommendations presented in this manual are based on research presented in shakoor. Figure 43 depicts a rock slope stability analysis diagram assuming a tension crack in the slope.
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. By increasing the distance of rock bolts, the strength. Integrated computer aided stability analysis and rock bolting design for underground excavations. Asuccessful rock slope stabilization program requires the integration of a. The effect of length of rock bolts on the stability of rock. The typical geotechnical rock mass profile of the ter rain is divided into two. Rocplane contains many helpful features that allow users to. Rock slope design guide ohio department of transportation. College of engineering, ahmedabad, india abstractthe slope stability is a very important problem in geotechnical engineering. 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. The aim of the chapter of this engineering manual is to explain a rock slope stability situated in a. Rock slope stability analysis a variety of engineering activities require excavation of rock cuts. Dowels are used on steep slopes in the same fashion as rock bolts, while shear pins are used on.
The hoekbrown failure criterion and gsi 2018 edition. Once the geometry of the rock blocks has been identified, the bolt forces necessary. Rocplane planar sliding stability analysis for rock slopes. Slope stability analysis of soil slopes using the nonvertical slice method proposed by sarma noncircular slip. 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. Slide 2d limit equilibrium slope stability analysis software. 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. 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. Stability analysis of bolts reinforced rock jointed slope. Rocplane contains many helpful features that allow users to rapidly build, modify and run models. Soilworks is designed for structural engineers with a background in geotechnical engineering and geotechnical engineers with a background in finite elements.
The example of rock bolts design for slope stabilization is used. Rock3d is a program for stability analysis of removable blocks on planar rock slopes. 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. Stability calculation method of slope reinforced by. The mechanical anchor bolt consists of a smooth bar with a threaded anchor end. Given the size of blocks and the maximum lenght for the bolt. Rocplane is a software tool for planar rock slope stability analysis and design. A mechanical shell anchor attached to the threaded end of the bolt is used to anchor the system. 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. 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. Abstract in this paper, the effect of length of rock bolts on the stability of rock slopes was investigated.
Rocplane is an interactive software tool for performing planar rock slope stability analysis and design. Redirock wall freeware is a robust software tool for geotechnical engineers to design and analyze cross sections of redirock gravity walls. Designing, constructing and monitoring of slopes in rock mass in. 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. Rock3d geotechnical design software slope stability. In civil engineering, projects include transportation systems such as highways and railways, dams for power production and. Study of effect of bolt anchorage parameters on rock slope stability by. Robust geotechnical design of rock bolts for stability. Reliabilitybased robust geotechnical design of rock bolts.
By increasing the distance of rock bolts, the strength reduction factor srf has been decreased. Uncertainty in input parameters that determine the stability of rock slopes may lead to uncertainty in evaluating the factor of safety. Tutorial on the basic use of slide software for slope stability analysis. 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. The effect of installation angle of rock bolts on the. Rockpack iii is applicable to practically all rock excavations, including highway roadcuts, quarries, mines, and building excavations. The first analysis should be done in the slope stability program, where the active an. 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. Analysis of planar failure stability in the slope stability calculation for planar failure and the wedged failure, shear strength of rock mass is dominant, and it presents the function of discontinuity strength and the paths in intact rock mass that separate the discontinuities arbanas, 2002. Study of effect of bolt anchorage parameters on rock slope stability. A process of the unstable 3d rock wedge stabilization design is described later on the. In the models, the pattern of parallel deterministic joints was used in spacing of 2. 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. Aug, 2017 the incredible ibex defies gravity and climbs a dam forces of nature with brian cox bbc duration.
Rs2 can be used for a wide range of engineering projects and includes excavation design, slope stability, groundwater. 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. Fundamentals and methods presents basic principles for the safe design of constructed or natural earth slopes. 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. Rockpack iii rockware rockware geoscientific software. 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. 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. 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. 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. Including calculations for bolt diameter, bond length, bolt length, bearing plates, number of bolts for block stabilization. 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.
Not all slope stability software is real expensive. For specific slope, stability analysis can be performer by utilize slide software from rock science or plaxis. Stability analysis and rock bolting design in a multiple joint rock mass. Stability calculation model of frame supporting structure with prestressed anchor. Slope stability best slope stability analysis software. Robust geotechnical design of rock bolts for stability of. Ge, principal consultant with gregory geotechnical gregeo. Also included in the document are two detailed design examples and technical specifications for ground anchors and for anchored walls. Software for slope stability analysis slope stability. Geotechnical design software slope stability analysis of rocky.
At cut design, stability analysis for the failure through the rock mass, plane and wedge failure and. Slope stability analysis slope w is the leading slope stability software for soil and rock slopes. Slope checks a range of slip circles and gives you the option to force slips through a point or. Geotechnical midas engineering software structural. This program is used for design of pile walls stabilizing slope movement or increasing safety factor of the slope. Context sensitive rock slope design solutions fhwa us. The fully grouted bolt is a convenient, effective, and economic technology for slope reinforcement.
Roctopple makes it easy to visualize the slope failure in both 2d and 3d. Proper ground support design is essential for the safety and productivity of underground mines and civil engineering projects. Once the geometry of the rock blocks has been identified, the bolt forces necessary to reach a required safety factor are calculated. What is the best software to analyse the slope stability.1446 1135 649 1203 133 929 1499 1545 19 630 625 59 1426 343 334 192 192 1575 79 650 1151 774 1467 1225 1393 753 1164 217 308 864 1281 1153 126 1407 1288 570 816 938 1427 432 863 768 1249 342