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Abstract In order to study the stability characteristics of the multi-stair high cut slope in loess highway，the centrifugal test was carried out based on loess slope engineering of Yanliang—Yumenkou highway，and numerical analysis method was used to analyze the stability behavior of multi-stair high cut slope by ANSYS program modeling，including the deformation process，destruction character，and stability characteristics. The results show that the lateral deformation will occur before the damage of multi-stair low unsaturated loess slope，and the maximum horizontal displacement appeared in 1/3 slope height and from 2/3 slope toe，and the characteristic of slope deformation is vertical firstly，and then horizontal. When the lateral deformation of unsaturated loess slope appears，there is a very short region of no horizontal strain in the loess slope. The stability of multi-stair-low slope is mainly controlled by macro-ratio of slope，but there is no influence of secondary low slope on high slope stability. Multi-stair-low slope，where inclination is above 70°，can eliminate the surface washing out by upstanding characteristic of loess. Therefore，the water infiltration is increased and the runoff generation is decreased. A good site condition is created for the protection of plant growth. Multi-stair-low slope is a well form in slope engineering of loess area highway，which has good engineering and application values.
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Received: 23 March 2009
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