Abstract
It is evident from extensive geological investigations completed since 1934 that the permanent landslides originate at the contact between loesses and Tertiary clays. The direct neighbourhood of subsurface watersheds and the lithological differentiation of the loesses are responsible for the lack of direct correlation between precipitation, ground water oscillations and the somewhat delayed slide movements. Site investigations, particularly by universal probe and Dutch penetrometer, provided relatively accurate results for calculating the stability of slopes by the Bishop and Nonveiller methods. The calculated results coincide very well with field observations.
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