【作者】 朱珍德； 孙林柱； 王明洋；

【Author】 ZHU Zhen-de~(1,2),Sun Lin-Zhu~2,Wang Ming-yang~3 (1.College of architecture and civil engineering,Wenzhou University,Wenzhou,Zhejiang 325035,China; 2.Institute of Geotechnical Engineering,Hohai University,Nanjing,Jiangsu 210098,China) (3.Engineering Institute of Engineering Corps:PLA Univ.ofSci.&Tech.;Nanjing 210007;China)

【机构】 温州大学建筑与土木工程学院； 河海大学岩土工程科学研究所； 中国人民解放军理工大学工程兵工程学院；

【摘要】 通过对取自海南昌江核电厂一期工程主厂区的黑云母花岗岩在RMT-150B多功能全自动刚性岩石伺服试验机进行单轴不同频率的循环加卸载试验,研究花岗岩动应变-应力滞回曲线、动弹性模量和阻尼比同循环频率之间的规律,然后对破坏断裂断口进行细观电镜扫描试验,分析了不同频率下花岗岩断口细观形貌与结构特征。结果表明:花岗岩在循环荷载作用下的加卸应力-应变曲线并不重合,而是形成一个封闭的滞回环;当循环频率在0.01-1.0 Hz范围内变化时,随着频率增大,花岗岩滞回环面积、动弹模和阻尼比都增大;通过细观数字图像试验分析发现,在循环荷载作用下,随着频率的增大,岩石断口细观裂纹总的数目、面积、分形维数均变大,给出不同频率循环荷载作用下岩石破裂的细观损伤力学机理。研究成果对海南昌江核电厂的地震反应分析和场地安全性评价有着重要参考价值。更多还原

【Abstract】 The uniaxial different frequency cyclic loading and unloading tests on biotite granite comes form the changjiang of Hainan nuclear power first-stage construction major factory district are done on the RMT-150B multi-function automatic rigid rock servo material testing machine.The law between cyclic frequency and dynamic stress- dynamic strain hysteretic curve,dynamic elastic modulus and damping ratio are researched.Then the micro-test is carried out to study its microscopic morphology and micro structure character of failure surface under different frequency cyclic loading.The results showed that the curves of strain and stress for loading and unloading are not superposition under cyclic loading,but hysteretic loops.When cyclic frequency changes between 0.01 Hz and 1.0 Hz,the granite hysteretic loop area,dynamic elastic modulus and damping ratio are increase following with frequency increase.Based on the testing analysis of microscopic digital image,there are more total number,larger area and fractal dimension of micro-cracks on rock fracture under higher frequency cyclic loading.Microscopic damage mechanics of rock failure under different frequency cyclic loading is given. The research result offers great reference value to seismic response analysis and site safety evaluation of the changjiang nuclear power.更多还原