| 循环加卸载下岩石变形破坏的损伤、能量分析 |
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| 引用本文： | 张向阳,成建,康永红,吴东,武尚荣.循环加卸载下岩石变形破坏的损伤、能量分析[J].有色金属(矿山部分),2011,63(5). |
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| 作者姓名： | 张向阳 成建 康永红 吴东 武尚荣 |
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| 作者单位： | 1. 昆明冶金研究院,昆明650031;中南大学,长沙410083
2. 昆明冶金研究院,昆明,650031 |
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| 基金项目： | 国家自然科学基金资助项目(50774093); 中南大学研究生学位论文创新选题资助项目(2009ssxt227) |
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| 摘 要： | 利用金川二矿区深部采集的含辉橄榄岩、花岗岩和混合岩进行了常规单轴压缩试验和循环加卸载试验,结果表明循环加卸载条件下的弹性模量值较常规单轴压缩试验小。运用损伤力学分析了循环加卸载条件下弹性模量降低的现象,结果表明应力—损伤呈线性关系,损伤—应变也呈线性变化,含辉橄榄岩的累积损伤最大,花岗岩次之,混合岩最小;基于损伤力学的"应变等效假说"算出了加卸载条件下弹性模量的理论值,与实测值比较发现偏差较大。对循环加卸载应力—应变曲线中的塑性滞环进行了能量分析,研究表明含辉橄榄岩的能量耗散值最大,花岗岩次之,混合岩能耗最小;能量耗散值与应力呈线性关系,后次循环加卸载所耗散的能量不等于前几次能耗值的累加,主要是由于岩石材料的缺陷和非线性的特征所致。
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| 关 键 词： | 循环加卸载 弹性模量 损伤 能量耗散 |
Analysis on damage and energy during rock deformation under cyclic loading and unloading conditions |
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| Authors: | ZHANG Xiangyang CHENG Jian KANG Yonghong WU Dong WU Shangrong |
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| Affiliation: | ZHANG Xiangyang1,2,CHENG Jian1,KANG Yonghong1,WU Dong1,WU Shangrong1(1.Kunming Metallurgy Research Institute,Kunming 650031,China,2.Central South University,Changsha 410083,China) |
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| Abstract: | Uniaxial compression experiment and cyclic loading and unloading experiments are carried out by using peridotite specimen,granite specimen and migmatite specimen collected in deep mining of Jinchuan No.2 mining district.Experimental results show that the elastic modulus under cyclic loading and unloading conditions are smaller than that under uniaxial compression.This phenomenon has been analyzed using damage mechanics and the results show that the relationship between stress and damage is linear as well as... |
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| Keywords: | cyclic loading and unloading elastic modulus damage energy dissipation |
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