Abstract. Surrounding rock masses' stabilities of cavities and crane beams of the hydropower station were studied using FLAC 3D . Results show that, due to the large excavation span and height, the main powerhouse and tail water hole have larger plastic zones after the excavation, and the same as 1 # unit and 2 # unit affected by the alteration belt; after the excavation, the plastic zones of the main powerhouse and main transformer hole appear connected and it is reduced obviously after support; from the comprehensive consideration of cavities' stabilities and economic benefits, scheme 3 ( bolts and nineteen cables ) is the optimal supporting plan, apt to ensure the overall stability of surrounding rock; displacements of surrounding rock and bolts' axial forces of crane beams are caused mainly by excavation, while the parts caused by wheel pressure are small. This offers a reliable basis for stability analysis and supporting design for underground cavern group.
For the characteristics of metro earch pressure balance (EPB) shield tunnel construction, first of all, the EPB shield tunnel is analyzed in detail, and their causes, impacts and mitigation measures are also studied accordingly. Then the risk factors of shield tunnel construction by using the idea of system engineering are identified, and its levels are analyzed, and safety assessment index system is structured. The case history of risk control for EPB shield tunnel in Changsha confirmed the rationality and feasibility of the suggested risk control measures.
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