Estimating the properties of weathered bedrock and pilerock interaction from the geological strength index |
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| Authors: | " target="_blank">Chun-mei Zhou Wei Shao " target="_blank">Kun-long Yin " target="_blank">Zong-ji Yang |
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| Institution: | 1.School of Civil Engineering and architecture,Wuhan Institute of Technology,Wuhan,China;2.Key laboratory of Meteorological Disaster, Ministry of Education/Joint International Research Laboratory of Climate and Environment Change / Collaborative Innovation Centre on Forecast and Evaluation of Meteorological Disasters/School of Hydrology and Water Resources,Nanjing University of Information Science and Technology,Nanjing,China;3.Faculty of Engineering,China University of Geosciences,Wuhan,China;4.Key Laboratory of Mountain Hazards and Surface Processes, Institute of Mountain Hazards and Environment,Chinese Academy of Sciences,Chengdu,China |
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| Abstract: | The effect of variable rock mass properties on pile-rock interaction poses a great challenge to the design of stabilizing piles and numerical analysis of pile-rock interaction. The paper presents a novel method to estimate the properties of weathered bedrock, which can be applied to routine design of landslide-stabilizing piles for collivial landslides. The Ercengyan landslide located in the Three Gorges Reservoir, China, is the area of interest for this study. A geological investigation and triaxial tests were conducted to estimate the basic parameters, including Geological Strength Index (GSI), uniaxial compressive strength σci and Hoek-Brown constant mi of intact bedrock in the study area. Hoek-Brown criterion was used to estimate mechanical properties of the weathered rock, including elastic modulus Em, cohesion c, friction angle Φ, and normal ultimate lateral resistance pmax. A parametric study was performed to evaluate the effect of parameterizations of GSI, σci and mi on the bedrock properties and p-y curves. The estimated rock mass properties were used with PLAXIS 2D software to simulate pile-rock interaction. Effect of GSI on stress at the pile-rock interface and in the rock, pile bending moment, pile shear force, and p-y curve were analysed. |
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