DEFORMATION MODE AND STABILITY ANALYSIS OF HIGH STICKING SLOPE OF COLLAPSIBLE LOESS
HU Changming1，MEI Yuan1，LIU Zengrong1，WANG Xueyan1，2
(1. College of Civil Engineering，Xi?an University of Architecture and Technology，Xi?an，Shaanxi 710055，China；
2. Huaqing College，Xi?an University of Architecture and Technology，Xi?an，Shaanxi 710043，China)
Abstract：Intact loess and remolded loess are combined for modeling. The centrifugal test is carried out to study the stability and deformation mode of the high sticking slope of collapsible loess in the states of natural moisture content and saturation. According to the results，in the state of natural moisture content，the stability of high sticking slope of collapsible loess is good；and consolidation deformation of sticking slope is the leading factor for high sticking slope deformation. The amount and rate of deformation after construction are large at early stage yet small at later stage；and the thicker the sticking slope thickness，the larger the settlement after construction and the longer the demand time of deformation completion. The thickness of sticking slope has a linear relation with settlement after construction. In the state of saturation，sticking slope consolidation and loess collapse cause the settlement of high sticking slope. If the settlement deformation is too large，the slope may crack along the weak zone formed by water penetration. The intensity of collapsible loess decides the stability of high sticking slope. The slide surface from soil damage passes through collapsible soil；and its location depends on the intensity difference between collapsible soil and its adjacent soil. When the interface between collapsible soil and its adjacent soil forms a weak layer caused by large intensity difference；the interface is definitely a part of slide surface；and the interface with lower intensity is firstly damaged. Moreover，the soil at the top of slide surface is in a typical translation sliding mode. On the contrary，the slide surface is approximately in circular arc；and there is a filter layer with a certain thickness between slide surface and interface.
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2012, Vol. 31 
