岩土工程学报2016，Vol.38Issue(8)：1391-1398,8.DOI:10.11779/CJGE201608005
脆性岩石渐进及蠕变失效特性宏细观力学模型研究
Macro-micro mechanical modelfor progressive and creep failure of brittle rock
摘要
Abstract
The progressive and creep failure of brittle rock in compression plays an important role in the investigation of rock mechanics. It has great significance for judging the stability of surrounding rock in deepunderground.Furthermore, growth of microcracks of brittle rock has greatinfluence on creep properties. Based on the relation between stress and crack growth, and on theevolution law of crack growth, andconsidering the link of damage in micromechanical and macroscopic scales, a new macro-micro model is proposed.The theoretical expressionsfor stress-strain relationship and creep are derived.The effects of confining pressure ontherelationship between stress and strain are analyzed.The effects of initial mcirocrack size and friction coefficient on stress-strain relationship and rock strength are also investigated. Thecrack initiation stress andthepeak stress under different confining pressures are obtained, which providesareference for applied stress under creep tests.The creep strain and strain rate under constant confining pressure and step axial loading are analyzed. Rationality of theoretical results is verified by these experimental results. Itmayprovide the theoretical reference for understanding the effects of microcrack growth onthemechanical properties of brittle rock in compression.关键词
宏细观力学模型/应力-应变关系/蠕变/断裂/损伤Key words
macro-micro model/stress-strain relation/creep/fracture/damage分类
建筑与水利引用本文复制引用
李晓照,邵珠山..脆性岩石渐进及蠕变失效特性宏细观力学模型研究[J].岩土工程学报,2016,38(8):1391-1398,8.基金项目
国家自然科学基金项目（51375373）；陕西省科技统筹创新工程计划项目 （）
