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| 组合坚固体应变扰动及波速异常的破裂前兆特征研究 | |
| 引用本文： | 许昭永,王彬,杨润海,赵晋明,梅世蓉.组合坚固体应变扰动及波速异常的破裂前兆特征研究[J].地震,1999,19(4):331-337. |
| 作者姓名： | 许昭永 王彬 杨润海 赵晋明 梅世蓉 |
| 作者单位： | 1)中国昆明 650041云南省地震局; 2)中国北京 100036中国地震局分析预报中心 |
| 摘 要： | 研究了高、低强度3段拼合岩石样品在单轴压缩和双轴单面直接剪切时的破裂特征及突发应变扰动与波速异常的破裂前兆。从分别置于高、低强度段上的应变变化看,在整个样品破裂前,低强度段(弱岩)先出现突发扰动,高强度段(强岩)后出现突发扰动。从分别穿过高、低强度段上的波速变化看,低强度段波速先出现下降,高强度段后出现下降。主破裂后明显的裂缝贯穿整个拼合岩样。进而讨论了坚固体孕震模式(主破裂前)的突发性应变前兆与波速异常的时空特征。 |
| 关 键 词： | 拼合岩样 坚固体破裂 应变扰动 P波走时 |
| 收稿时间： | 1998-10-28 |
| 修稿时间： | 1999-01-10 |
STRAIN SHAKING AND WAVE VELOCITY ANOMALY AND STUDIES ON FRACTURING PRECURSORY FEATURES OF COMBINED STRONG BODY |
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| Xu Zhaoyong,Wang Bin,Yang Runhai,Zhao Jinming,Mei Shirong.STRAIN SHAKING AND WAVE VELOCITY ANOMALY AND STUDIES ON FRACTURING PRECURSORY FEATURES OF COMBINED STRONG BODY[J].Earthquake,1999,19(4):331-337. | |
| Authors: | Xu Zhaoyong Wang Bin Yang Runhai Zhao Jinming Mei Shirong |
| Institution: | 1) Seis mological Bureau of Yunnan Province, Kunmi ng 650041，China; 2) Center for Analysis and Prediction, CSB, Beijng 10036, China |
| Abstract: | Under the conditions of uniaxial compression and biaxial single lateral direct shearing, the authors have studied fracturing features, sudden strain shaking and wave velocity anomalies for fracturing precursors of the 3 segment combined sample with high and low strengths. Viewing from the variations of strains in high and low strengths, there appears sudden shaking first in the segment with low strengths (weak rock), and then in the segment with high strength (strong rock), before the whole sample fracturing. Viewing from variations of wave velocities passing through segments with high and low strengths, there appears decrease of wave velocities first in the segment with low strength, and then in the segment with high strength. The fissures pass throughout the whole segmented sample obviously after the main fracture. Further, the authors have discussed spatial temporal features of the sudden strain precursor and wave velocity anomalies in the seismogenic model of strong body (before main fracture). |
| Keywords: | Segmented rock sample Fracture of strong body Strain shaking P travel time |
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