文章基本信息

标题：Solution for strain-softening surrounding rock reinforced by grouted bolts
本地全文：下载
作者：Jin-feng Zou ; Ze-hang Qian ; Han-cheng Dan 等
期刊名称：Advances in Mechanical Engineering
印刷版ISSN：1687-8140
电子版ISSN：1687-8140
出版年度：2017
卷号：9
期号：5
DOI：10.1177/1687814017697280
语种：English
出版社：Sage Publications Ltd.
摘要：To evaluate the reinforcement effectiveness of the grouted rock bolts, a dimensionless parameter’s approach (i.e. bolt density β ) is adopted. Following the Mohr–Coulomb and generalized Hoek–Brown failure criteria, the concept of the neutral point for the grouted rock bolts is introduced, and the determination of the equivalent plastic zone is divided into three categories (i.e. minimal yielding, major yielding, and excessive yielding). The potential plastic zone is sufficiently subdivided into a large number of concentric annuli through the finite difference approximation of equilibrium and compatibility equations. A simple approach for circular tunnel in strain-softening surrounding rock incorporating the neutral point of the grout rock bolts is proposed to derivate the solutions of stress and displacement. The proposed approach is validated with the published results. With the increase in bolt density β , the plastic radius would reduce 10%–30%, and the radial displacements would decrease by 10%–40%.
关键词：Strain-softening surrounding rock; grouted rock bolts; bolt density parameter; neutral point; stepwise approach