The initial stresses on a soil are s91 5 s9z and s93 5 Kos9z

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The initial stresses on a soil are s91 5 s9z and s93 5 Kos9z, where K o is the lateral earth pressure coefficient at res

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The initial stresses on a soil are s91 5 s9z and s93 5 Kos9z, where K o is the lateral earth pressure coefficient at rest (see Chapter 7). The soil was then brought to failure (critical state) by reducing s93 while keeping s91 constant. At failure, s93 5Ks91, where K is a lateral earth pressure coeffi cient. Show that t cs t zx 5 1 2 K 1 2 K o cos fcs r where t zx is the maximum shear stress under the initial stresses and t cs is the failure (critical) shear stress.

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