Effect of undercut on the lower bound stability of vertical rock escarpment using finite element and power cone programming
作者机构：Department of Civil EngineeringIndian Institute of Technology KharagpurWest Bengal 721302India
出 版 物：《Frontiers of Structural and Civil Engineering》 (结构与土木工程前沿（英文版）)
年 卷 期：2022年第16卷第8期
页 面：1040-1055页
核心收录：
学科分类：07[理学] 0814[工学-土木工程] 0701[理学-数学]
基 金：This work used the Supercomputing facility of IIT Kharagpur established under National Supercomputing Mission(NSM) Government of India and supported by Centre for Development of Advanced Computing(CDAC) Pune.
主 题：undercut vertical escarpment stability Hoek-Brown yield criterion PCP
摘 要：In the present study,the stability of a vertical rock escarpment is determined by considering the influence of undercut.Lower bound finite element limit analysis in association with Power Cone Programming(PCP)is applied to incorporate the failure of rock mass with the help of the Generalized Hoek-Brown yield criterion.The change in stability due to the presence of undercut is expressed in terms of a non-dimensional stability number(σci/γH).The variations of the magnitude ofσci/γH are presented as design charts by considering the different magnitudes of undercut offset(H/vu and wu/vu)from the vertical edge and different magnitudes of Hoek-Brown rock mass strength parameters(Geological Strength Index(GSI),rock parameter(mi),Disturbance factor(D)).The obtained results indicate that undercut can cause a severe stability problem in rock mass having poor strength.With the help of regression analysis of the computed results,a simplified design equation is proposed for obtainingσci/γH.By performing sensitivity analysis for an undisturbed vertical rock escarpment,we have found that the undercut height ratio(H/vu)is the most sensitive parameter followed by GSI,undercut shape ratio(wu/vu),and mi.The developed design equation as well as design charts can be useful for practicing engineers to determine the stability of the vertical rock escarpment in the presence of undercut.Failure patterns are also presented to understand type of failure and extent of plastic state during collapse.
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