Stress-drop effect on brittleness evaluation of rock materials

来源期刊:中南大学学报(英文版)2019年第7期

论文作者:潘玉涛 杨小礼 史贵才 陈冠 刘勇 代国忠

文章页码:1807 - 1819

Key words:rock material; stress-drop effect; plastic flow factor; strength criteria

Abstract: Uniaxial or triaxial compression test of cylindrical rock specimens using rock mechanics testing machine is a basic experimental method to study the strength and deformation characteristics of rock and the development process of rock fracture. Extensive literature review has been conducted on this issue; meanwhile, experimental and numerical studies have been conducted on the stress-drop effect on the brittleness of rock materials. A plastic flow factor of λ is proposed to describe the stress-drop effect. Evaluation methods of the factor λ corresponding to the four yield criteria of rock mass are proposed. Those four yield criteria are Tresca criterion, von-Mises criterion, Mohr-Coulomb criterion and Drucker-Prager criterion. For simplicity purposes, an engineering approximation approach has been proposed to evaluate the stress-drop with a non-zero strain increment. Numerical simulation results validated the effectiveness of the plastic flow factors λ as well as the engineering approximation approach. Based on the results in this study, finite element code can be programmed for brittle materials with stress-drop, which has the potential to be readily incorporated in finite element codes.

Cite this article as: SHI Gui-cai, CHEN Guan, PAN Yu-tao, YANG Xiao-li, LIU Yong, DAI Guo-zhong. Stress-drop effect on brittleness evaluation of rock materials [J]. Journal of Central South University, 2019, 26(7): 1807-1819. DOI: https://doi.org/10.1007/s11771-019-4135-2.

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