Failure precursor of surrounding rock mass around cross tunnel in high-steep rock slope
来源期刊：中南大学学报(英文版)2013年第1期
论文作者：MA Ke(马克) 唐春安 Xu Nu-wen(徐奴文) LIU Feng(刘峰) XU Jing-wu(徐敬武)
文章页码：207 - 217
Key words：rock slope; cross tunnel; microseismic monitoring; precursory characteristics; heterogeneity
Abstract: The stability of the surrounding rock mass around cross tunnel in the right bank slope of Dagangshan hydropower station, in the southwestern China, was analyzed by microseismic monitoring as well as numerical simulations. The realistic failure process analysis code (abbreviated as RFPA3D) was employed to reproduce the initiation, propagation, coalescence and interactions of micro-fractures, the evolution of associated stress fields and acoustic emission (AE) activities during the whole failure processes of the surrounding rock mass around cross tunnel. Combined with microseismic activities by microseismic monitoring on the right bank slope, the spatial-temporal evolution and the micro-fracture precursor characteristics during the complete process of progressive failure of the surrounding rock mass around cross tunnel were discussed and the energy release law of the surrounding rock mass around the cross tunnel was obtained. The result shows that the precursor characteristic of microfractures occurring in rock mass is an effective approach to early warn catastrophic damage of rock mass around cross tunnel. Moreover, the heterogeneity of rock mass is the source and internal cause of the failure precursor of rock mass.
MA Ke(马克)1,2, TANG Chun-an(唐春安)1,2, Xu Nu-wen(徐奴文)3, LIU Feng(刘峰)4, XU Jing-wu(徐敬武)5
(1. Institute of Rock Instability and Seismicity Research, Faculty of Infrastruction Engineering,
Dalian University of Technology, Dalian 116024, China;
2. State Key Laboratory of Coastal and Offshore Engineering (Dalian University of Technology),
Dalian 116024, China;
3. State Key Laboratory of Hydraulics and mountain River Engineering
(College of Water Resources and Hydropower, Sichuan University), Chengdu 610065, China;
4. HydroChina Chengdu Engineering Corporation, Chengdu 610072, China;
5. China Guodian Dadu River Dagangshan Hydropower Development Co., Ltd., Chengdu 610072, China)
Abstract:The stability of the surrounding rock mass around cross tunnel in the right bank slope of Dagangshan hydropower station, in the southwestern China, was analyzed by microseismic monitoring as well as numerical simulations. The realistic failure process analysis code (abbreviated as RFPA3D) was employed to reproduce the initiation, propagation, coalescence and interactions of micro-fractures, the evolution of associated stress fields and acoustic emission (AE) activities during the whole failure processes of the surrounding rock mass around cross tunnel. Combined with microseismic activities by microseismic monitoring on the right bank slope, the spatial-temporal evolution and the micro-fracture precursor characteristics during the complete process of progressive failure of the surrounding rock mass around cross tunnel were discussed and the energy release law of the surrounding rock mass around the cross tunnel was obtained. The result shows that the precursor characteristic of microfractures occurring in rock mass is an effective approach to early warn catastrophic damage of rock mass around cross tunnel. Moreover, the heterogeneity of rock mass is the source and internal cause of the failure precursor of rock mass.
Key words:rock slope; cross tunnel; microseismic monitoring; precursory characteristics; heterogeneity
