In-flight Excavation of a Loess Slope in a Centrifuge Model Test

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• 作者：Zhongjie Fan ; P. H. S. W. Kulatilake…
• 关键词：Loess slopes ; Centrifuge model test ; Excavation ; Earth pressure ; Deformation process ; Progressive failure
• 刊名：Geotechnical and Geological Engineering
• 出版年：2016
• 出版时间：October 2016
• 年：2016
• 卷：34
• 期：5
• 页码：1577-1591
• 全文大小：7,489 KB
• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Geotechnical Engineering
  Hydrogeology
  Terrestrial Pollution
  Waste Management and Waste Technology
  Civil Engineering
  
• 出版者：Springer Netherlands
• ISSN：1573-1529
• 卷排序：34

文摘

An in-flight excavation centrifuge model test was conducted to investigate the behavior of a loess slope under different excavation slope angles. The displacements of the loess slope were measured using the particle image velocimetry system. Measurement results showed that the slope can be divided into several zones according to the features of the horizontal displacement. The excavation slope angles significantly affected the deformation process and the division of the slope. The term “slip zone” that described the area where strain highly concentrated when the slip surface ran through was used to analyze the failure process. The analysis results showed that the shear failure initially occurred near the excavation zone and progressed upwards and was accompanied with the tensile failure generated in the upper part of the slope. The shear failure eventually ran through the slip zone when it reached the upper tensile failure. The results of the earth pressure measurements demonstrated that the slope under excavation had undergone a stress path similar to the reduced triaxial compression tests prior to failure. It is clear that loess slopes are more likely to failure when they are influenced simultaneously by excavation and precipitation.