Titlebook: Cavity Expansion Methods in Geomechanics; Hai-Sui Yu Book 2000 Hai-Sui Yu 2000 Fundament.applied mechanics.geotechnical engineering.mechan

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Further Elastoplastic Solutionsmodels. Although critical state models are widely used in soil mechanics, other types of plasticity models have also been used to describe the non-linear stress-strain behaviour of soil and rock. For this reason, this chapter describes some additional solutions for cavity problems in elastic-plastic strain hardening/softening soils and rocks.

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Pile Foundations and Earth Anchorsn in soils, the rigorous analysis of the behaviour of driven piles is difficult because of its highly material and geometric nonlinear nature. Although considerable progress has been made over the last 20 years in the analysis of driven piles in clays, the analysis and design of piles in sand is still largely empirical.

Adrenal-Glands

Underground Excavations and Tunnelling (i.e. unlined tunnels), completely removes the initial stresses which existed in the area of tunnelling or excavations, Figure 10.1. Therefore, it may be reasonable to assume that the action of tunnelling and underground excavation can be modelled by the unloading of a cavity from the . stress state.

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Wellbore Instabilityue of lost equipment and time arising directly from wellbore instability, but no one would dispute estimates of over $500 millions per year worldwide (Dusseault, 1994). Better analysis and prediction methods for wellbore instability will definitely help reduce the costs associated with the wellbore breakout and instability problems.

Galactogogue

Diastole

Methodisches Vorgehen in der Arbeit,e of perfect plasticity is that the strength of material remains constant during the loading and unloading process. In reality, however, the strength of soil may vary considerably with deformation history. To account for this dependence in cavity expansion analysis, a strain-hardening/softening plas

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