求翻译：Another way of indicating the difference between elasticity and plasticity theories is shown in Fig 8. A soil specimen is acted upon by vertical and horizontal normal stresses such that
v >
h, but failure has not been reached, as shown in Fig 8(a). An increment in shear stress is added to the soil element, as shown in Figs 8(b) and (c). Plastic behavior, shown in Fig. 8(b), entails vertical compression of the specimen, because the direction of the much larger total stress determines the direction of the plastic strain increment, independent of whether the stress increment is a normal or a shear stress increment. In comparison, elastic behavior results in strain increments in proportion to the applied stress increment and is independent of the already existing stress state.是什么意思？

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