Title of Paper:Failure precursor of surrounding rock mass around cross tunnel in high-steep rock slope

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Date of Publication:2013-01-01

Journal:JOURNAL OF CENTRAL SOUTH UNIVERSITY

Included Journals:SCIE、EI

Volume:20

Issue:1

Page Number:207-217

ISSN No.:2095-2899

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 RFPA(3D)) 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.