Spanish translation: La base se mantiene estática, y la cima del talud cae
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15:51 Feb 21, 2008
English to Spanish translations [PRO] Geology
English term or phrase:as the toe heaves and the top of the slide drops
Most techniques used to calculate slope stability are static, rigid block, limiting?equilibrium analyses. If the driving forces exceed the resisting forces, the slope is considered unstable.
These analyses cannot be used to predict post-displacement deformation because the dynamic energy relationships of a moving block are not considered in this type of analysis. Therefore, our knowledge of the behavior of unstable slopes is largely empirical.
Predicting slope movement is further complicated by changes in the excess driving force that can occur with displacement. The shear surface is rarely a smooth plane, and shearing of asperities can reduce the resisting force. Where the shear surface approximates a rotational shear, the driving force decreases ***as the toe heaves and the top of the slide drops***.
The cyclic nature of slope displacement can also be explained by changes in pore pressure and mining activity. For example, in the case of a water-filled tension crack, displacement will cause the crack to widen and the water level to drop, reducing the driving force. As the crack fills again, the driving force will increase.