A New Perspective on the Constant mi of the Hoek–Brown Failure Criterion and a New Model for Determining the Residual Strength of Rock,Rock Mechanics and Rock Engineering

当前位置： X-MOL 学术 › Rock Mech. Rock Eng. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

A New Perspective on the Constant mi of the Hoek–Brown Failure Criterion and a New Model for Determining the Residual Strength of Rock
Rock Mechanics and Rock Engineering ( IF 5.5 ) Pub Date : 2020-06-03 , DOI: 10.1007/s00603-020-02164-6
Mingming He , Zhiqiang Zhang , Jun Zheng , Fangfang Chen , Ning Li

The constant mi is a fundamental parameter required in the Hoek–Brown (H–B) failure criterion for estimating rock strength. Triaxial tests for the calculation of this constant are time-consuming and expensive. In this paper, a new perspective is presented for the physical meaning of the parameter mi of the H–B model in consideration of the contact friction coefficient. A correlation between the contact friction coefficient and mi is established using published data. A practical approach is proposed to determine the value of the parameter mi. In addition, previously proposed methods of estimating the residual strength of rock are reviewed. A novel method based on the H–B failure criterion is established to predict the residual strength of rock. The single model parameter used in the new model controls the residual strength nonlinearity. The strengths predicted by the proposed method for limestone, granite, slate, and sandstone are in good agreement with those measured during laboratory tests. The corresponding errors are within a range of 15%. This method is applied to an actual rock mass around a tunnel in the Hanjiang to Weihe River Project of China.

更新日期：2020-06-03

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11