地震作用下的灰坝液化特征及其动力稳定性分析——以安阳电厂为例

LIQUEFIED CHARACTERS AND DYNAMIC STABILITY OF ASH DAM OF THE ANYANG POWER PLANT UNDER THE ACTION OF EARTHQUAKE

根据安阳电厂灰坝岩土工程性质及其动力学特性 ,建立了适合灰坝工程的动力分析模型并采用有限元法进行了动力分析。在此基础上 ,在不同工况条件下对灰坝进行了抗液化安全评价及抗震稳定性分析。研究表明 ,在不设碎石桩、无排渗体条件下 ,粉煤灰子坝的抗液化安全系数 Ks<1.2 5 ,将发生液化 ;在设碎石桩、有排渗体条件下 ,粉煤灰子坝的抗液化安全系数明显提高 ,Ks≥ 1.2 5 ,不会发生液化。抗震稳定性分析表明 ,在上述两种工况条件下灰坝是稳定的。

According to rock soil engineering properties and dynamic character of the ash dam of Anyang Power Plant, the dynamic analytical model is set up by the finite element method. Based on this, the evaluations of anti liquefaction and earthquake have been made for the dam in different conditions.The research shows that the ash sub dam will be liquefied when the sub dam does not be set up metal piles and drainage works,and anti liquefied safety coefficient K s<1.25. In contrast,when metal piles and drainage works are set up, the sub dam will not be liquefied, and its anti liquefied safety coefficients K s will be significantly improved more than 1.25. The stable analysis of the earthquake indicates that the ash dam will be stable in the forenamed two conditions.