锦屏一级水电站左岸坝肩高边坡长期稳定性数值分析

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Abstract The long-term stability of left bank abutment high slope greatly affects the normal operation and safety of Jinping I hydropower station. In order to sufficiently understand the long-term stability of left bank abutment high slope，a geomechanical model containing weak structural planes of f5，f8，f2，f42–9 and lamprophyre veins X is established. The long-term creep behavior of slope rock mass is simulated under normal water level condition by using of Nishihara model and finite difference numerical calculation method. Results of numerical analysis show that the basic tendency of change for long-term creep numerical calculation results and field monitoring data of engineering are consistent. After a period of time，the specific creep deformation of slope rock mass gradually tended to be constant，and the creep rate went to a steady value. The Nishihara rheological model could reflect the rheological deformation characteristics of slope rock mass in Jinping I hydropower station. Creep deformation was obvious in many positions，such as the outcrop regions of f5，f8，f2，f42–9 and lamprophyre veins X，dangerous rock slope，cableway platform slope upper the elevation of 1 960 m，excavation slope in the elevation of 1 885～1 960 m，“bulk mass”，deep rock mass of PD44X. The creep deformation of intersection parts between excavation platform of spandrel groove and weak structural plane in 1 730 m were more apparent under the thrust at push force of arch abutment condition，which needed to pay more attention and strengthen monitoring.

Key words： slope engineering Jinping I hydropower station long-term stability creep effect Nishihara model numerical analysis

Received: 09 January 2013

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https://rockmech.whrsm.ac.cn/EN/Y2014/V33/IS1/3105

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