CENTRIFUGE MODELING OF APPARENT DIP SLIDE FROM OBLIQUE THICK BEDDING ROCK LANDSLIDE
FENG Zhen1,YIN Yueping2,LI Bin1,YAN Jinkai1
(1. Key Laboratory of Neotectonic Movement and Geohazard,Ministry of Land and Resources,Institute of Geomechanics,Chinese Academy of Geological Sciences,Beijing 100081,China;2. China Institute of Geoenvironment Monitoring,Beijing 100081,China)
Abstract:An experimental investigation into mechanism of apparent dip slide from oblique thick bedding slope failure is performed through geotechnical centrifuge modeling test. The model is casted by mixture of gypsum,cement and barite and consists of four sets of joints. Agreements are obtained between field investigation and centrifuge test that weak layer softening and key block failure are the main reasons why Jiweishan landslide occurs. Driving blocks reach equilibrium and then start to creep crushing on key block in front as centrifugal acceleration rises. Finally,rock slope model fails instantaneously when centrifugal acceleration reaches 16.2 g. The key block fails in shear abruptly and slides in apparent dip followed by high-speed slide of driving blocks. The results of this experiment validate and reproduce the driving-blocks-and-key-blocks mode of apparent dip slide from oblique thick bedding rock slope failure proposed by previous studies.
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