Earthquake 2resistance safety evaluation of overflow section of Qingtianhe masonry gravity dam
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Abstract:
According to the engineering geological conditions of Qingtianhe masonry gravity dam, a three 2dimensional finite ele 2 ment model of the overflow dam section was built using the three 2dimensional finite element method. The response spectrum method was used to conduct the seismic response and safety evaluation of the dam. In consideration of the load combinations caused by the seismic loading, the most disadvantaged tensile stress superposition principle was adopted to linearly superpose the static and dynamic calculation results, and the comprehensive static dynamic response was obtained. On the basis, the strength and stability against sliding of the dam were analyzed and evaluated. T he results showed that the strength of the dam meets the standard requirement under the static and dynamic loadings with seismic intensity of level VII; the safety coefficient of stability against sliding of the dam foundation is 3. 47, which is greater than the minimum safety coefficient allowed by the standard; and however, the carrying capacity of dam foundation is insufficient and needs to be reinforced.
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