| 含预制软弱带的岩石破裂过程的数值模拟 |
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| 引用本文： | 焦明若,张国民,唐春安,傅宇方. 含预制软弱带的岩石破裂过程的数值模拟[J]. 地震学报, 2002, 24(1): 35-41 |
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| 作者姓名： | 焦明若 张国民 唐春安 傅宇方 |
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| 作者单位： | １）中国沈阳110031辽宁省地震局 ２）中国沈阳110006东北大学资源与土木工程学院博士后流动站３）中国北京100036中国地震局分析预报中心 ４）中国沈阳110006东北大学岩石破裂与失稳研究 |
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| 基金项目： | 国家重点基础研究发展规划项目 ( G1 9980 4 0 7)，国家自然科学基金 ( 4 9974 0 0 9)共同资助 |
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| 摘 要： | 考虑到岩石脆性破坏过程中介质的不均匀性之特点，对岩石样品中含预制弱介质条带的岩石样品破坏过程进行二维有限元数值模拟，并对弱介质带的破坏贯通过程、新的断层的产生和有关的地震活动进行了研究．数值模型展示了岩石从变形、微观破坏到整体破坏的全过程以及微震活动的时空分布特征．应力、应变和微震活动的时空分布形象地描绘了岩石变形的局部化和时空迁移等现象，这与实际地壳中所观测到的现象是一致的．此外，模拟结果与实验观测结果也是一致或相似的．
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| 关 键 词： | 预制弱带 岩石破坏 微震活动 数值模拟 |
| 文章编号： | 0253-3782(2002)06-0035-07 |
| 修稿时间： | 2000-10-13 |
NUMERICAL SIMULATION OF ROCK PROGRESSIVE FAILURE ON SAMPLES WITH A PRE-EXISTED WEAK ZONE DURING BRITTLE FAILURE |
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| Abstract: | Considering the heterogeneity of geomechanical materials, seismicity during brittle rock failure under compressive loading on the sample with an original weak zone are simulated by using rock failure process analysis code (RFPA 2D). The run-through process of weak zone, the forming of new fault and associated micro-seismicities are studied. The modeling demonstrates the total process of source development of earthquake from deformation, micro-failure to collapse and the behavior of temporal-spatial distribution of micro-seismicities. The stress, strain and the temporal-spatial distribution of micro-seismicities life-likely portrayed the phenomena of localization and temporal transitions, which is similar to those observed in our real crust. Also, the results obtained in simulations are in agreement with or similar to the reported experimental observations. |
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| Keywords: | pre-existed weak zone rock failure micro-seismicity numerical simulation |
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