INDIAN INSTITUTE OF TECHNOLOGY ROORKEE

Abstract

A landslide has not been issue of today but is continuing in every part of the world from centuries. Geotechnical Fngineers are well versed in applicability of traditional methods of slope stability analysis. Fellenius(1936) introduced the Ordinary or Swedish method of slices. In mid- 1950s. Janbu(1954) and 13ishop(1955) developed advanced method of slices. With the advent of computers, the rigorous methods like Mongestron-Price and Spenccr(1967) have been developed. Freduland, 1984 worked on quantitative comparisons of deterministic approaches. In this work, his idea has been followed to extend to know difference between the results from different approaches without considering the depth-factor. In deeper perspective to the problem of slope stability analysis, uncertainty in field values is a common problem which can be encountered. Natural soils vary spatially in physical properties due to their composition and depositional process. The uncertainty in geotechnical engineering is mainly attributed to spatial variations, errors in testing and sampling and modeling. 1)uc to economic and safety constraints, the risk cannot be reduced to zero and the designs must be as 'low and reasonable' as possible. Unless all the parameters affecting the uncertainty are considered, it is not possible to define specifically the structure. A blanket of factor of factor of safety cannot cover the risk involved in uncertainty. Owing to the random nature of the prevailing conditions, it is essential to extensively study, characterize and evaluate sources of uncertainty. The present work aims to find out the reliability of the slope by application of different methods. It defines the minimum value of the variable parameter required for stability of the structure. In this study, the variation has been seen for reliability index with respect to the height of the slope. which is considered as the primary cause affecting the safety of the slope.