中南大学学报（自然科学版）2016，Vol.47Issue(12)：4147-4152,6.DOI:10.11817/j.issn.1672-7207.2016.12.025
加轴压卸围压条件下岩石的力学特性与能量特征
Mechanical and energy characteristics of granites under unloading test
摘要
Abstract
Through carrying out unloading experiments by increasing axial pressure while decreasing confining pressure on granites in tri-axial unloading test, the complete stress-strain curves, deformation characteristics and energy characteristics were obtained. The dilatancy angle was used to describe the dilatancy characteristics of rock.The results show that the relationship between lateral strain and confining pressure is firstly linear, and then nonlinear in the total stage of unloading confining pressure. Development of lateral plastic deformation is more rapid than that of the axial direction, which shows obvious lateral dilatancy. Deformation modulus decreases with the increase of the unloading confining pressure, and with the increase of the initial confining pressure, deformation modulus increases. The Poisson’s ratio increases continually with the decrease of the confining pressure.The variation of axial increment strain in the same time is slightly greater than that of the lateral increment. The dilatancy angle decreases with the increase of the initial confining pressures.关键词
岩石力学/三轴卸载试验/力学特征/能量特征Key words
rock mechanics/tri-axial unloading test/mechanical characteristics/energy characteristics分类
矿业与冶金引用本文复制引用
方前程,商丽,商拥辉,陈钊峰..加轴压卸围压条件下岩石的力学特性与能量特征[J].中南大学学报（自然科学版）,2016,47(12):4147-4152,6.基金项目
国家科技部科研院所专项基金资助项目(2011EG122210)；河南省高等学校重点科研项目(16A120015)；湖南省自然科学基金资助项目(2015JJ4023)；湖南省教育厅资助项目(13C308)(Project(2011EG122210) supported by the Special Funds for Research Institute of National Ministry of Science and Technology （2011EG122210）
Project(16A120015) supported by the Key Scientific Research Projects of Colleges and Universities in Henan Province （16A120015）
Project(2015JJ4023) supported by the Natural Science Foundation of Hunan Province （2015JJ4023）
Project(13C308) Scientific Research Fund of Education Department of Hunan Province) （13C308）
