雁列式断层拉张破裂有限元数值模拟
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摘要
为了研究典型断层构造形式——雁列式断层的变形破坏特征,采用拉张破裂有限元程序开裂准则8,当0.995σmax≤σ1≤σmax时节点开裂,模拟了雁列式断层的破裂过程。雁列式断层按错列方向与运动方向的关系可分为两类:拉张型和挤压型。分别对这两种断层结构的破裂过程进行了模拟,并与数字散斑实验和岩石试件现场实验结果进行了对比,数值试验很好的模拟了第2条裂纹即拉破坏裂纹,可以为研究地震的发生机制及前兆特征等提供理论支持。
In order to study the conformation form of the typical faults—the distortion damage characteristic of en-echelon faults,the paper uses the eighth fracture rule of the finite element program of the tension fracture.When 0.995σmax≤σ1≤σmax,the node cracks,the fracture process of the en-echelon faults is simulated.The en-echelon faults is divided into extrusion type and tension type according to the relation between staggered direction and movement direction.The fracture processes of these two kinds fault structures and comparison is made of the experiment results of the digital speckle experiment with the field experiment of the rock sample.The numerical experiment simulates the second crack,that is,the crack of the tension fracture.This can provide the theory support for the study on the occurrence mechanism and warning signs of the earthquake.
In order to study the conformation form of the typical faults—the distortion damage characteristic of en-echelon faults,the paper uses the eighth fracture rule of the finite element program of the tension fracture.When 0.995σmax≤σ1≤σmax,the node cracks,the fracture process of the en-echelon faults is simulated.The en-echelon faults is divided into extrusion type and tension type according to the relation between staggered direction and movement direction.The fracture processes of these two kinds fault structures and comparison is made of the experiment results of the digital speckle experiment with the field experiment of the rock sample.The numerical experiment simulates the second crack,that is,the crack of the tension fracture.This can provide the theory support for the study on the occurrence mechanism and warning signs of the earthquake.
引文
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[3]王来贵,黄润秋,王泳嘉,等.岩石力学系统运动稳定性及其应用[M].北京:地质出版社,1998:57-58.
[4]王勖成,邵敏.有限单元法基本原理和数值方法[M].北京:清华大学出版社,1997.
[5]凌贤长,蔡德所.岩体力学[M].哈尔滨:哈尔滨工业大学出版社,2002.
[6]吴德伦,黄质宏,赵明阶.岩石力学[M].重庆:重庆大学出版社,2002.
[7]王来贵,王泳嘉.岩石拉伸流变失稳模型及其应用[J].矿山压力与顶板管理,1994(3/4),3-6.
[8]王来贵,赵娜,周永发,等.岩石受拉破坏的数值模拟方法[J].辽宁工程技术大学学报,2007,26(2):198-200.
[9]王来贵,赵娜,初影,周永发.不同面积载荷作用下的岩石试件破裂数值模拟[J].沈阳建筑大学学报:自然科学版,2007,(6):44-47.
[10]王来贵,李建新,赵娜,等.岩石工程系统破坏的弱场控制探讨[J].辽宁工程技术大学学报,2005,24(5):671-673.
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