By N. Simons, B. Menzies, M. Matthews
This new addition to the 'Short direction' sequence combines either soil and rock slope engineering - in impact, brief classes - in a single concise quantity. Like its acclaimed significant other quantity a quick path in origin Engineering, this e-book makes a speciality of the necessities, explaining easy equipment of balance research and employing them to quite a lot of useful purposes
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Additional resources for A Short Course in Soil and Rock Slope Engineering
The minimum factor of safety occurs at the equilibrium long term condition when the strength is lowest. Whether the soil is loaded or unloaded, the stability is generally represented in terms of a factor of safety that is the integrated amount by which the available soil strength may be reduced around a hypothetical shear surface before limiting equilibrium occurs. If a ®eld failure occurs the factor of safety is unity and the average in situ shear strength may be estimated from a back-analysis of the slipped mass.
13, there is a weak correlation of factor of safety with soil plasticity showing how inappropriate the short-term 0 analysis is to what is essentially a long-term stability problem. This is, of course, to be expected from the soil mechanics considerations of short-term stability given at the beginning of this chapter. e. for positive loading conditions and for the short-term undrained condition for temporary cuttings and excavations. g. see Fig. 10) and from the idealized rigid±perfectly plastic value back-analysed from a ®eld failure.
E. the soil specimen or zone is undisturbed the size of the test specimen or test zone is representative of the soil in the mass during the test the structural distortions and rates of distortion of the soil mass are similar to those which would arise in the ®eld at failure in the test, the distortions and rates of distortion of shear surfaces are similar to those which would arise in a full-scale failure. Finally, of course, the principle of similitude requires a realistic analytical model in which the shear test data may be used to give an estimate of the stability of the ®eld prototype.