# Analysis of nailed slopes using limit equilibrium and finite difference methods

 Author: Lam, Wing-yin Title: Analysis of nailed slopes using limit equilibrium and finite difference methods Degree: M.Sc. Year: 1999 Subject: Slopes (Soil mechanics)Soil stabilizationFinite differencesHong Kong Polytechnic University -- Dissertations Department: Multi-disciplinary StudiesDept. of Civil and Structural Engineering Pages: 105, [76] leaves : ill. ; 30 cm Language: English InnoPac Record: http://library.polyu.edu.hk/record=b1480009 URI: http://theses.lib.polyu.edu.hk/handle/200/1885 Abstract: Nowadays, the factor of safety (FOS) of soil nailed cut slopes is commonly computed by conventional slope stability programs. These conventional programs are based on limit equilibrium methods of slices, for examples, Spenser Method, Spencer-Wright Method, Simplified Janbu Method. In the analysis, additional stabilisation forces provided by soil nails are assumed acting in the same direction as the axial direction of the nails before deformation. However, after a certain slope deformation or sliding, a soil nail will be actually deflected with a resulting force deviated from the nail's axis, probably providing more resistance against slope sliding. It is now commonly considered that the stability analysis using the conventional method is conservative. This thesis will present the results of a comparative study of nailed slope stability analysis using Spenser-Wright Method, a conventional slope program based on limit equilibrium and 'FLAC', a finite difference program (FD) based on continuum mechanics. In the conventional slope program, the soil behaviour is assumed rigid-plastic. While in the FD program, an elastic-plastic model is used for the soil behaviour. The FOS in the FD is defined as cc'= c'/FOS and tan 峖c'=tan(峖')/FOS. The parameters cc' and 峖c' are used in the FD analysis and FOS is computed by try and error. The computed FOS from FD is compared with the FOS obtained using the conventional slope program. The ratio of FOS from FD and FOS from slope program will be studied for variation of key parameters such as slope angle, slope height, and strength parameters (c'and 峖'). The results from this study will provide a better understanding of the performance of soil nailed slopes and useful relationships for design purposes.

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