远场应变速率对非均质断层滑动成核影响研究  

Research on Influence of Rote Strain Loading Rate on Heterogenetic Fault Slip Nucleation

作　　者：王威[1] 任青文[1] 张丽峰[2] 

机构地区：[1]河海大学土木工程学院,江苏南京210098 [2]中国石油大庆油田有限责任公司天然气分公司,黑龙江大庆163511

出　　处：《水电能源科学》2008年第3期50-53,共4页Water Resources and Power

基　　金：国家重点基础研究发展计划(973项目)基金资助项目(2007CB714104)

摘　　要：为进一步探讨断层滑动成核机理,以无限体弹性位错理论为基础,结合速率—状态相关摩擦准则,采用数值方法研究了远场应变加载率对非均质断层成核的影响及各物理量在断层失稳过程中的变化。结果表明,对于非均质断层,远场应变加载率对断层成核的时间和后期的速率、摩擦应力均有影响。远场应变加载率越高,断层成核时间越早,成核后期速率越高,应力降越小,成核区的尺寸略有增加。In order to discuss the mechanism of fault slip nucleation, the effect of rote strain loading rate on the heterogenetic fault slip nucleation is researched based on the theory of the infinite elastic dislocation and rate-state dependent friction law, and the numerical method is adopted. The result of study indicates that the rote strain loading rate has great influence on the nucleation time, the velocity and the friction stress in the later stage of the nucleation process. With the rote strain loading rate increasing, the fault nucleation time is earlier, the velocity is faster and faster and the stress drop is lower and lower in the later stage of the nucleation process, and at the same time the dimension of nucleation increases slightly.

关 键 词：速率-状态相关摩擦准则 断层 成核 弹性位错 非均质 

分 类 号：P315[天文地球—地震学]