长江科学院院报2019，Vol.36Issue(2)：71-76,80,7.DOI:10.11988/ckyyb.20170645
原始损伤性片麻岩变形破坏中的能量特征分析
Energy Properties of Original Damaged Gneiss During Deformation Failure
摘要
Abstract
In an attempt to investigate the energy variation properties of gneiss under different initial fracture states, uniaxial and triaxial tests were designed and conducted on rock specimens from a tunnel project. By analyzing the stress-strain curves of test specimens, the evolution of energy with strain was obtained. Results show that in-situ stress environment has great influence on the properties of rock specimens. The energy evolution rule of gneiss can be divided into three stages in triaxial test: secondary steady growth stage, stable fracture stage, and accelerated fracture stage. Gneiss of high damage degree is of weak ability to restore elastic energy.The expansion of gneiss is more obvious and fracture occurs at more positions. Fractured compacted rock stores higher proportion of elastic en-ergy, with more apparent brittle failure. If the practical energy release rate is higher than theoretical elastic energy release rate under confining pressure unloading, damage will be produced to weaken the strength of rock.This study enriches the cognition of energy evolution of damaged rock mass and provides a new idea for the construction in gneiss engineering.关键词
片麻岩/弹性能/能量耗散/单轴试验/三轴试验/损伤程度Key words
gneiss/elastic energy/energy dissipation/uniaxial test/triaxial test/damage degree分类
建筑与水利引用本文复制引用
冯伟,邓荣贵,王拓,陈拔进..原始损伤性片麻岩变形破坏中的能量特征分析[J].长江科学院院报,2019,36(2):71-76,80,7.基金项目
广东省水利科技创新项目(2015-11) （2015-11）
国家自然科学基金面上项目(51779017) （51779017）
长江科学院中央级公益科研院所基本科研业务费项目(CKSF2017023/YT) （CKSF2017023/YT）
