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论文类型：期刊论文

发表时间：2012-03-01

发表刊物：TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY

收录刊物：SCIE、EI、Scopus

卷号：28

期号：1

页面范围：345-349

ISSN号：0886-7798

关键字：Rock bolt; Ultimate pullout capacity; Bond cohesive strength; Friction angle; Dichotomy

摘要：This paper focuses on the grout cohesive strength and the grout friction angle of rock bolt, which have a significant influence on the pullout force and are difficult to estimate. Traditional method estimate the two parameters from the results of pull-out test conducted under different confining pressures. St. John and Van Dillen gave two approximate empirical formulas in 1984. In this text, a new method was proposed to back calculate the grout cohesive strength and the grout friction angle based on given field pullout force of rock bolt. In order to verify the method, a numerical model was built by FLAC(3D) to approach the two parameters by the principle of dichotomy. The convergence result had been proved to be right by numerical pull-out tests. (C) 2011 Elsevier Ltd. All rights reserved.