辽宁工程技术大学学报（自然科学版）2012，Vol.31Issue(1)：26-30,5.
单轴循环荷载对煤弹塑性和能量积聚耗散的影响
Influence of cyclic uniaxial loading on coal elastic-plastic properties and energy accumulation and dissipation
摘要
Abstract
In order to investigate the influence of cyclic loading on the coal-rock elastic-plastic properties and energy accumulation & dissipation, the cyclic loading test on uniaxial compression on Coal 22 was conducted in this study. Based on the analysis results, the first loading and unloading, and reloading are positively correlated with elasticity modulus. With the increase of cycle number, the elastic strain appears in an inverted U-shape change while the plastic strain exhibits a U-shape change. AH the elasticity modulus E, elastic energy index Wet and energy dissipating rate Wed caused by strain follows an inverted U-shape change. The first average variation rate n of elasticity modulus is 30%, and the energy dissipation φ>sd follows a U-shape change. When elastic energy index Wet reaches its maximum, a burst phenomenon will easily occur. With the increase of stress amplitude, the speed of production and propagation of micro-crack will increase, as well as the micro-plastic deformation speed will also increase. With the increase of loading level, the elastic energy index shows a tendency of increasing earlier and decreasing later during the compression and linear elasticity period, and reaches the maximum at "elastic-plastic critical point".关键词
煤/循环荷载/弹塑性/能量积聚耗散/弹性能/塑性能/弹性能量指数/能量耗散率Key words
coal/ cyclic loading/ elastic-plastic properties/ energy accumulation & dissipation/ elastic energy/plastic energy/ elastic energy index/ energy dissipation rate分类
矿业与冶金引用本文复制引用
刘江伟,黄炳香,魏民涛..单轴循环荷载对煤弹塑性和能量积聚耗散的影响[J].辽宁工程技术大学学报（自然科学版）,2012,31(1):26-30,5.基金项目
国家自然科学基金资助项目(51004104) （51004104）
国家重点基础研究发展计划资助项目(2007CB209400) （2007CB209400）
