| 应用数字散斑相关方法实验研究雁列断层变形破坏过程 |
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| 引用本文： | 陈俊达,马少鹏,刘善军,金观昌.应用数字散斑相关方法实验研究雁列断层变形破坏过程[J].地球物理学报,2005,48(6):1350-1356. |
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| 作者姓名： | 陈俊达 马少鹏 刘善军 金观昌 |
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| 作者单位： | 清华大学工程力学系,北京,100084;北京大学地球物理学系,北京,100871;北京理工大学理学院力学系,北京,100081;河北理工大学资源与环境工程学院,唐山,063100 |
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| 基金项目： | 国家自然科学基金(NSFC50504001)，辽宁省教育厅高等学校科学研究项目(202183390)资助 |
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| 摘 要： | 以数字散斑相关方法（DSCM）为观测手段，对雁列断层结构的破坏过程进行了实验研究，观测和分析了变形破坏过程中模型表面的变形场演化过程.断层结构由一块含两条平行割缝的大理岩平板模拟，模型试件在双轴试验机上加载；DSCM观测系统在加载过程中记录试件表面的散斑图像，然后分析得到模型表面待测区域各记录时刻的位移场及应变场.全场连续的变形数据清晰地反映了雁列断层结构的变形破坏过程的各种细节.实验结果显示，变形最初集中在断层带周围，然后迁移到雁列区，最后雁列区贯通，结构发生滑动导致整个结构发生失稳破坏.对变形破坏过程中的变形场进行统计分析发现，一种描述变形局部化特征的统计指标—Cv值，可以作为一个雁列断层破坏的前兆指标.
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| 关 键 词： | 雁列断层 破坏 数字散斑相关方法(DSCM) 变形场 破坏前兆 |
| 文章编号： | 0001-5733（2005）06-1350-07 |
| 收稿时间： | 2004-09-28 |
| 修稿时间： | 2004-09-282005-06-05 |
An experimental study of the failure process of en-echelon fault structure using the digital speckle correlation method |
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| CHEN Jun-Da,MA Shao-Peng,LIU Shan-Jun,JIN Guan-Chang.An experimental study of the failure process of en-echelon fault structure using the digital speckle correlation method[J].Chinese Journal of Geophysics,2005,48(6):1350-1356. |
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| Authors: | CHEN Jun-Da MA Shao-Peng LIU Shan-Jun JIN Guan-Chang |
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| Institution: | 1.Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China 2 Department of Geophysics, Peking University, Beijing 100871, China 3 Department of Mechanics, School of Science, Beijing Institute of Technology, Beijing 100081,China 4 Sc |
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| Abstract: | The failure process of en-echelon fault structure is experimentally studied and the evolution of the deformation filed during failure is inspected and analyzed using the digital speckle correlation method(DSCM).The fault structure is simulated by a marble plate with 2 parallel slits that firstly cut and then filled with gypsum.The specimens are loaded on a large-scale double-axis test machine.The DSCM system captures speckle images during the test process and then processes them to obtain deformation field.The whole failure process of the echelon fault structure is revealed by evolution of the deformation field.The result shows that the deformation is firstly localized around the fault and then the echelon area,where the two faults are interactive with each other.The failure also finally evolves in this echelon area.Moreover,the deformation field during loading is statistically studied and a quantitative C-v-value,which expresses the characteristics of deformation localization,is an indicator for the failure of the echelon fault structure. |
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| Keywords: | En-echelon fault structure Failure Digital speckle correlation method(DSCM) Deformation field Precursor of failure |
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