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Discontinuous Deformation Analysis for an Underground Cavern Group with Stepwise Support
(1 Geotechnical and Structure Engineering Research Center, Shandong University, Jinan 250061; 2 Shandong Urban Construction Vocational College, Jinan 250103; 3 School of Civil Engineering, Shandong University, Jinan 250061)
Abstract In this paper, an existing discontinuous deformation analysis program was improved using the aspects of stepwise support and relevant convergence criterion. The stability of an underground cavern group with random joints in a large hydropower station was analyzed by the improved program, especially in terms of the effects of construction factors and the stepwise support, and it was verified by comparing the analyzed results with the measured ones. Through a comparison of the influence of various excavation sequences of the three caverns (main powerhouse, transformer chamber and tailrace surge chamber) on rock stability, an optimization was carried out for the support scheme based on the deduced depths of the failure zone and the displacements of key points, showing that the optimal excavation sequence is to excavate the main powerhouse and the tailrace surge chamber first and then the transformer chamber; the cable bolting may be additionally installed at key parts of the tailrace surge chamber to improve the stress state of the surrounding rock.
Abstract：
In this paper, an existing discontinuous deformation analysis program was improved using the aspects of stepwise support and relevant convergence criterion. The stability of an underground cavern group with random joints in a large hydropower station was analyzed by the improved program, especially in terms of the effects of construction factors and the stepwise support, and it was verified by comparing the analyzed results with the measured ones. Through a comparison of the influence of various excavation sequences of the three caverns (main powerhouse, transformer chamber and tailrace surge chamber) on rock stability, an optimization was carried out for the support scheme based on the deduced depths of the failure zone and the displacements of key points, showing that the optimal excavation sequence is to excavate the main powerhouse and the tailrace surge chamber first and then the transformer chamber; the cable bolting may be additionally installed at key parts of the tailrace surge chamber to improve the stress state of the surrounding rock.
WANG ,
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.Discontinuous Deformation Analysis for an Underground Cavern Group with Stepwise Support[J] MODERN TUNNELLING TECHNOLOGY, 2015,V52(3): 182-188
2015, Vol. 52 