Modeling the progressive failure of hard rock pillars

被引：56

作者：

Renani, H. Rafiei ^{[1
]}

Martin, C. D. ^{[1
]}

机构：

[1] Univ Alberta, Dept Civil & Environm Engn, Edmonton, AB T6G 1H9, Canada

来源：

TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY | 2018年 / 74卷

基金：

加拿大自然科学与工程研究理事会;

关键词：

Pillar strength; CWFS model; Failure mechanism; CANADIAN GEOTECHNICAL COLLOQUIUM; STRESS-STRAIN RELATION; BRITTLE ROCK; SPECIMEN SIZE; STRENGTH; DAMAGE; LOCALIZATION; DEFORMATION; PREDICTION; DESIGN;

D O I：

10.1016/j.tust.2018.01.006

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

An enhanced cohesion weakening and friction strengthening model is proposed to simulate the progressive failure of hard rock pillars using two- and three-dimensional finite difference analysis. The documented behavior of 85 pillars in two mines was used for model validation. The numerical models successfully separated unstable/failed pillars from stable pillars and also captured the observed mechanism of progressive failure in hard rock pillars. Pillar stress-strain curves indicated that while pillars with W/H < 2 exhibit strain softening, wider pillars begin to display strain hardening. It was shown that strength of wide pillars may be overestimated by conventional models using empirically estimated parameters.

引用

页码：71 / 81

页数：11

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