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Saman Daneshmand, Bujang B. K. Huat Improving Soil Properties to Prevent Surficial Slope Failure


Many hill slope areas are vulnerable to soil erosion and shallow slope failures due to intense and frequent rainfall of tropical climate.In this study, Laboratory tests were performed on natural soil and soil mixed with deferent percentage of lime to improve soil properties and resistance against slope failure.When lime mixed with in-situ soil, it reduces swelling potential and shrinkage hence inhibit formation of cracks and also reduce soil's dispersibility therefore, reduce erosion possibility. Soil mixed with lime has lower permeability thus, it enhances capillary barrier effects and limits rainfall infiltration into the soil.Results show that optimum lime content to be used in the mix design is 7% by dry unit weight of soil. A two dimensional finite element model of slope was used to evaluate performance of the optimum lime-soil mixed as capillary barrier. The analysis revealed that the optimum thickness of slope cover system in capillary barrier is 30cm. Finding of this study, would contribute to a practical method of slope stabilisation and to display optimum slope cover thickness in capillary barrier effects.

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J. Duncan Michael Soil Strength and Slope Stability


The definitive guide to the critical issue of slope stability and safety Soil Strength and Slope Stability, Second Edition presents the latest thinking and techniques in the assessment of natural and man-made slopes, and the factors that cause them to survive or crumble. Using clear, concise language and practical examples, the book explains the practical aspects of geotechnical engineering as applied to slopes and embankments. The new second edition includes a thorough discussion on the use of analysis software, providing the background to understand what the software is doing, along with several methods of manual analysis that allow readers to verify software results. The book also includes a new case study about Hurricane Katrina failures at 17th Street and London Avenue Canal, plus additional case studies that frame the principles and techniques described. Slope stability is a critical element of geotechnical engineering, involved in virtually every civil engineering project, especially highway development. Soil Strength and Slope Stability fills the gap in industry literature by providing practical information on the subject without including extraneous theory that may distract from the application. This balanced approach provides clear guidance for professionals in the field, while remaining comprehensive enough for use as a graduate-level text. Topics include: Mechanics of soil and limit equilibrium procedures Analyzing slope stability, rapid drawdown, and partial consolidation Safety, reliability, and stability analyses Reinforced slopes, stabilization, and repair The book also describes examples and causes of slope failure and stability conditions for analysis, and includes an appendix of slope stability charts. Given how vital slope stability is to public safety, a comprehensive resource for analysis and practical action is a valuable tool. Soil Strength and Slope Stability is the definitive guide to the subject, proving useful both in the classroom and in the field.

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Sebnem Duzgun Reliability-Based Rock Slope Stability Analysis


Design of a safe slope or checking the safety of an existing one is an important and complicated problem in rock engineering. The main source of complication is the existence of uncertainties, which can be analyzed and quantified in a rational way only through probabilistic methods. This book explains the principles of reliability-based analyses and design of rock slopes that can easily be used by the practicing engineers. The first-order second-moment (FORM) method and Monte Carlo Simulation (MCS) procedure are adopted as the reliability assessment models and they are implemented for the case of plane failure. For the systematic analysis of uncertainties associated with the rock slope stability parameters, a model developed within the framework of first-order second-moment approach is presented. The implmentation of the described principles and approaches also illustarated with real case study examples

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Rolando Javellonar and Victorino Taylan Rice Straw Geotextile as Ground Cover for Soil Erosion Mitigation


Results of simulation revealed that the main effects of slope gradient and geotextile on the different parameters investigated were found to be highly significant. Regardless of the intensity of rainfall applied, significantly higher sediment concentration, sediment yield and soil erosion were observed at slope gradient of 35 degrees. Except for sediment yield, lowest sediment concentration and soil erosion were noted at the lowest slope gradient of 10 degrees. On the other hand, the different geotextiles used as ground cover greatly affected all the parameters being evaluated. Irrespective of rainfall intensity, all the geotextiles tested had significantly lower sediment concentration, sediment yield and soil loss as compared with NGC. Generally, the relationships of slope gradient versus sediment concentration, sediment yield and soil erosion were found to be nonlinear. At any given level of rainfall intensity, the three indicators increased correspondingly as the slope was increased from 10 to 35 degrees and then declined when the slope was further increased from 35 to 60 degrees.

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