循环加卸载下饱和岩石变形破坏的损伤与能量分析  

Analysis on Damage and Energy in Deformation and Fracture of Saturated Rock Subjected to Cyclic Loading and Unloading

作　　者：夏冬[1,2] 杨天鸿[1,2] 王培涛[1,2] 张鹏海[1,2] 

机构地区：[1]东北大学深部金属矿山安全开采教育部重点实验室,辽宁沈阳110819 [2]东北大学资源与土木工程学院,辽宁沈阳110819

出　　处：《东北大学学报（自然科学版）》2014年第6期867-870,共4页Journal of Northeastern University(Natural Science)

基　　金：国家重点基础研究发展计划项目(2013CB227902);国家自然科学基金资助项目(50904013;51174045);国家自然科学基金重点资助项目(51034001);中央高校基本科研业务费专项资金资助项目(N090101001;N120601002);教育部高等学校博士学科点专项科研基金资助项目(20120042120053)

摘　　要：以中关铁矿深部饱水闪长岩单轴循环加卸载的室内力学试验结果为基础,结合线弹性损伤力学理论,针对饱和岩石在单轴循环加卸载作用下的变形、损伤及能耗特性进行了研究.结果表明:每一级加载与卸载过程的应力-应变曲线均呈内凹形,随着循环次数及应力水平的增加,塑性滞回曲线向应变增大的方向移动,且应变中不可恢复的变形逐渐减小;轴向应变、横向应变和体应变的绝对损伤参数与累积损伤参数均随循环次数及应力水平的增大而增大,且三者的变化趋势基本一致;能量耗散值与循环的次数近似呈线性关系,后一循环的能耗不等于前几次循环能耗之和.The deformation, damage and energy consumption were investigated based on the experiment of water-saturated diorite samples from Zhongguan iron mine, under the uniaxial cyclic loading and unloading. The results show that the stress-strain curves display internally sunken at each loading and unloading cycle. With the increasing of the cycle times and the stress level, the plastic hysteresis curve moves towards the larger and the non-recoverable deformation declines. The absolute and total damage parameters of the axial, lateral and volumetric strains increase with the stress. Moreover, a same trend is found for the three parameters. The value of energy dissipation shows approximately liner relationship with the cycle times, and the later energy dissipation is not equal to the sum of previous energy dissipations.

关 键 词：单轴压缩 循环加卸载 饱和岩石 损伤 能量耗散 

分 类 号：TD458[矿业工程—矿山机电]