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Application of geogrids in waste dump stability: a numerical modeling approach
- Rai, Rajesh, Khandelwal, Manoj, Jaiswal, Ashok
- Environmental earth sciences 2012 v.66 no.5 pp. 1459-1465
- computer software, mathematical models, mining, particle size distribution, safety factor, soil, spatial distribution, tensile strength
- Geosynthetic is widely used to reinforce the weak rock mass, mine waste dump, soil slopes road cut slopes, etc. The present paper discusses the effect of geogrids on the stability of mine waste dump. The stability of mine waste dump has been done by Fast Langrage Analysis of Continua (FLAC) slope software, which is based on finite difference method. Reinforcement by geogrids mainly depends on the tensile strength, aperture size of geogrids, and particle size distribution of dump rock mass. Different permutations and combinations of spacing between two geogrid sheets have been taken into consideration to study the stability of mine waste dump. The factor of safety is calculated to quantify the effect of geogrids on waste dump slope. It has been observed from numerical modeling that the maximum slope angle is 45Â° at a height of 10Â m. The scope of increasing slope angle from 45 to 60Â° is evaluated using geogrids. It has been found from the study that the factor of safety increases as the spacing between geogrids decreases. Maximum strain is also plotted of each case to identify the slip circle. The positions of geogrids modify the probable slip circle or failure plane of mine waste dump. Using ten geogrids at a spacing of 1Â m, the slope angle can be increased up to 60Â° with factor of safety of 1.4.