| Physical meaning and prediction efficiency of the load/unload response ratio of rocks in strain-weakening phase before failure |
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| 作者姓名： | 许昭永 杨润海 王彬 赵晋明 王赟赟 梅世蓉 |
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| 作者单位： | ZHAO Jin-ming1) WANG Yun-yun1) MEI Shi-rong2)1) Seismological Bureau of Yunnan Province，Kunming 650041，China 2) Center for Analysis and Prediction，China Seismological Bureau，Beijing 100036，China |
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| 基金项目： | Key project from China Seismological Bureau (9691309020301)，State Natural Sciences Foundation of China (19732060). |
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| 摘 要： | Introduction In studying the instability of a non-linear system, YIN (1987), YIN and YIN (1991), YIN, et al (1994), and Yin, et al (1994, 1995, 2000) have presented a concept of load/unload response ratio (LURR) of the system. When the system is in a stable state, its response process to the load/unload follows the same trajectory on the stress-strain diagram, and the load/unload response ratios are equal. However, when the system departs from a stable state, its response to the load/un…
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| 收稿时间： | 23 April 2001 |
| 修稿时间： | 4 November 2001 |
Physical meaning and prediction efficiency of the load/unload response ratio of rocks in strain-weakening phase before failure |
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| Xu Zhao-yong , Yang Run-hai , Wang Bin , Zhao Jin-ming , Wang Yun-yun and Mei Shi-rong.Physical meaning and prediction efficiency of the load/unload response ratio of rocks in strain-weakening phase before failure[J].Acta Seismologica Sinica(English Edition),2002,15(1):47-55. |
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| Authors: | Xu Zhao-yong Yang Run-hai Wang Bin Zhao Jin-ming Wang Yun-yun and Mei Shi-rong |
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| Institution: | 1. Seismological Bureau of Yunnan Province, Kunming 650041, China
2. Center for Analysis and Prediction, China Seismological Bureau, Beijing 100036, China |
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| Abstract: | Rock experiment results indicate that the load/unload response ratio (LURR) of rocks expressed via strain energy may have singular or negative value after the stress in the rock reaches its maximum before rock failure or when the rock goes into the strain-weakening phase. The universality of this phenomenon is discussed. Expressed via strain or strain energy and the travel time of P wave, the variation form of the reciprocal of LURR during the process of rock failure preparation is derived. The results show that after a sharp decrease the reciprocal of LURR reaches its minimum when the main fracture of the rock is about to appear. This feature can be taken as an indication that the rock main fracture is impending. |
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| Keywords: | strain-weakening phase load/unload response ratio prediction efficiency |
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