کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4744334 | 1641851 | 2011 | 8 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Methods for assessing the stability of slopes during earthquakes—A retrospective Methods for assessing the stability of slopes during earthquakes—A retrospective](/preview/png/4744334.png)
During the twentieth century, several methods to assess the stability of slopes during earthquakes were developed. Pseudostatic analysis was the earliest method; it involved simply adding a permanent body force representing the earthquake shaking to a static limit-equilibrium analysis. Stress-deformation analysis, a later development, involved much more complex modeling of slopes using a mesh in which the internal stresses and strains within elements are computed based on the applied external loads, including gravity and seismic loads. Stress-deformation analysis provided the most realistic model of slope behavior, but it is very complex and requires a high density of high-quality soil-property data as well as an accurate model of soil behavior. In 1965, Newmark developed a method that effectively bridges the gap between these two types of analysis. His sliding-block model is easy to apply and provides a useful index of co-seismic slope performance. Subsequent modifications to sliding-block analysis have made it applicable to a wider range of landslide types. Sliding-block analysis provides perhaps the greatest utility of all the types of analysis. It is far easier to apply than stress-deformation analysis, and it yields much more useful information than does pseudostatic analysis.
Research Highlights
► Pseudostatic slope-stability analysis is very simple but commonly over-conservative.
► Permanent-displacement analysis is simple and yields reliable results.
► Stress-deformation analysis is complex but yields highly accurate results.
Journal: Engineering Geology - Volume 122, Issues 1–2, 12 September 2011, Pages 43–50