高拱坝谷幅变形机制及非饱和裂隙岩体有效应力原理研究

doi:10.13722/j.cnki.jrme.2015.0972

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Abstract Valley deformation induced by impoundment affects the current working behavior and long-term safety of high arch dams. However，the evaluation criterion for the influence of valley deformation is still limited in the design method of arch dam. In this paper，the features of valley deformation during impoundment in the site of high arch dam and the limitation of conventional calculation methods were summarized. Based on the effects of water pressure in fractures，the hydrostatic pressure was taken into consideration in the yield function of elastoplastic model，and applied in the numerical simulation of Jinping I arch dam. The calculated displacements agreed well with the observed values，which preliminarily explained the reduction of valley width and other deformation phenomena in the dam site. The mesoscopic deformation mechanism of fractured rock mass during initial impoundment was then explored. The effective stress principle for unsaturated and non-persistent fractured rock mass was presented. The research revealed that the water pressure distributed in fractures changed the equilibrium state of rock mass，which was the main driving force of plastic deformation in the dam site after impoundment.

Key words： rock mechanics fractured rock mass effective stress plastic deformation high arch dam

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2015.0972 OR http://www.rockmech.org/EN/Y2015/V34/I11/2258

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