中文摘要：

以粉煤灰坝工程为研究对象,采用二维动力有限元分析和坝坡极限平衡分析相结合的方法,研究在地震作用下粉煤灰坝的液化特性及动力稳定性。研究表明：目前粉煤灰子坝宜按照坡比1∶3左右、单级子坝坝高不超过5 m进行设计;在子坝有必要的防渗和排水设施、初期坝排水设施比较完善的情况下,需在运行期给灰库上游再留50 m左右的干滩;粉煤灰子坝在地震作用下不会发生液化,只是在上游灰库表面1.0~2.0 m深度内的粉煤灰会发生液化,不至于引起坝体失稳,坝体安全有保证。

英文摘要：

The liquefaction and dynamic stability of the foundation of a fly-ash dam under seismic load were studied by combining the two-dimensional dynamic finite element analysis with the limit equilibrium analysis of dam slope method.The research results show that according to the slope ratio of 1∶3 for the current flay-ash sub-dams,the height of single-stage sub-dam is not designed more than 5 m.When the sub-dam has necessary impervious elements and drainage facilities and the starter dam has good drainage facilities,dry sands about 50 m in length are designed at the upper reaches of fly-ash silo during the operating period.Liquefaction does not occur in the flay-ash sub-dam under seismic load,but it only occurs within the range of 1.0～2.0 m in depth at the upper reaches of fly-ash silo.Accordingly,it does not cause dam instability so as to ensure the dam safety.