A tensile model for the interpretation of microseismic events near underground openings

被引:109
作者
Cai, M [1 ]
Kaiser, PK [1 ]
Martin, CD [1 ]
机构
[1] Laurentian Univ, Geomech Res Ctr, Sudbury, ON P3E 2C6, Canada
关键词
microseismic event; seismic energy; source size; stress-induced fracturing; tensile fracturing;
D O I
10.1007/s000240050185
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
For small-scale microseismic events, the source sizes provided by shear models are unrealistically large when compared to visual observations of rock fractures near underground openings. A detailed analysis of the energy components in data from a mine-by experiment and from some mines showed that there is a depletion of S-wave energy for events close to the excavations, indicating that tensile cracking is the dominant mechanism in these microseismic events. In the present study, a method is proposed to estimate the fracture size from microseismic measurements. The method assumes tensile cracking as the dominant fracture mechanism for brittle rocks under compressive loads and relates the fracture size to the measured microseismic energy. With the proposed method, more meaningful physical fracture sizes can be obtained and this is demonstrated by an example on data from an underground excavation with detailed, high-quality microseismic records.
引用
收藏
页码:67 / 92
页数:26
相关论文
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