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Abstract The assess principle and basic idea of regional tectonic stability are discussed based on engineering practice. The zoning of regional tectonic stability is obtained according to geological data in region of first stage West Route of South-to-North Water Transfer Project. Faults nearby the project are nonactive. There are no active faults and seismic epicenters in dam sites and tunnel areas. The crust of the project site is relative stable. The surrounding rock masses are mainly grades II-III，and rock classifications of grades IV-V are distributed regionally. Density of rockburst is not high. Deformational phenomena of surround rocks exist in slate strata and faulted zones. In case of surrounding rock and deformation feature，the tunnel boring machine(TBM) is applicable to the project. The possible water quantities flowing into tunnel are calculated initially. There are possible zones of groundwater inflowing in the section of shallow tunnel，syncline core and faulted zones.
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Received: 04 February 2009
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