A method for evaluating dynamic tensile damage of rock

被引：42

作者：

Wang, Zhiliang ^{[1
,2
]}

Li, Yongchi ^{[1
]}

Wang, J. G. ^{[3
]}

机构：

[1] Univ Sci & Technol China, Dept Modern Mech, Hefei 230027, Anhui, Peoples R China

[2] Tech Univ Bergakad Freiberg, Inst Geotech, D-09596 Freiberg, Germany

[3] Natl Univ Singapore, Ctr Protect Technol, Singapore 119260, Singapore

来源：

ENGINEERING FRACTURE MECHANICS | 2008年 / 75卷 / 10期

关键词：

rock; tensile damage; evolution law; empirical formula; velocity-time history; sensitivity analysis;

D O I：

10.1016/j.engfracmech.2008.01.005

中图分类号：

O3 [力学];

学科分类号：

08 ; 0801 ;

摘要：

This paper presents two evolution laws for dynamic tensile damage of brittle rock based on light gas gun (LGG) tests. By analyzing the attenuation of sound-wave propagation in the rock samples before and after impact tests, one evolution law for dynamic tensile damage of rock is introduced and incorporated into the finite element code LS-DYNA through a user-defined subroutine. The improved code is then applied to the simulation of the tensile damage and blast crater near free face of rock mass, and the resulting crater geometry is compared with empirical formula. In addition, based on the phenomenological point of view and the velocity-time histories recorded in LGG tests, another evolution law of tensile damage is proposed to consider the nucleation and growth of microflaws in rock. Parametric analyses are carried out with the self-developed finite difference code and an optimization procedure for the parameter determination is suggested. (c) 2008 Elsevier Ltd. All rights reserved.

引用

页码：2812 / 2825

页数：14

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