Estimating the properties of weathered bedrock and pile-rock interaction from the geological strength index  

作　　者：ZHOU Chun-mei SHAO Wei YIN Kun-long YANG Zong-ji 

机构地区：[1]School of Civil Engineering and architecture, Wuhan Institute of Technology [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 [3]Faculty of Engineering, China University of Geosciences [4]Key Laboratory of Mountain Hazards and Surface Processes, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences

出　　处：《Journal of Mountain Science》2018年第8期1757-1776,共20页山地科学学报（英文）

基　　金：supported by the National Natural Science Foundation of China (Grant No. 41002112);Key teaching construction projects of Wuhan Institution of Technology (J201403);the Chinese Postdoctoral Science Foundation (Grant No. 2017M621783, 2018T110527);the International Postdoctoral Exchange Fellowship Program by China Postdoctoral Council (Year 2017);the Startup Foundation for Introducing Talent of NUIST (Grant No. 2017r045)

摘　　要：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 σ_(ci) and Hoek-Brown constant m_i of intact bedrock in the study area. Hoek-Brown criterion was used to estimate mechanical properties of the weathered rock, including elastic modulus E_m, cohesion c, friction angle Φ, and normal ultimate lateral resistance p_(max). A parametric study was performed to evaluate the effect of parameterizations of GSI, σ_(ci) and m_i 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.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 σ_（ci） and Hoek-Brown constant m_i of intact bedrock in the study area. Hoek-Brown criterion was used to estimate mechanical properties of the weathered rock, including elastic modulus E_m, cohesion c, friction angle Φ, and normal ultimate lateral resistance p_（max）. A parametric study was performed to evaluate the effect of parameterizations of GSI, σ_（ci） and m_i 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.

关 键 词：LANDSLIDE Stabilizing pile Weathered rock Pile-rock interaction Geological strength index 

分 类 号：S0[农业科学]