Vol15 No.8: 1757-1776
【Title】Estimating the properties of weathered bedrock and pile-rock interaction from the geological strength index
【Author】ZHOU Chun-mei1; SHAO Wei2*; YIN Kun-long3; YANG Zong-ji4
【Addresses】1 School of Civil Engineering and architecture, Wuhan Institute of Technology, Wuhan 430073, 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 210044, China ; 3 Faculty of Engineering, China University of Geosciences, Wuhan 430074, China; 4 Key Laboratory of Mountain Hazards and Surface Processes, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China
【Corresponding author】SHAO Wei
【Citation】Zhou CM, Shao W, Yin KL, et al. (2018) Estimating the properties of weathered bedrock and pile-rock interaction from the geological strength index. Journal of Mountain Science 15(8). https://doi.org/10.1007/s11629-017-4576-8
【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.
【Keywords】Landslide; Stabilizing pile; Weathered rock; Pile-rock interaction; Geological strength index