粉煤灰作为排水垫层筑坝的动力分析

Dynamic Analysis of Flyash Drainage Blanket Dam

淮南某电厂灰坝设计拟采用粉煤灰作为坝基排水垫层筑坝以节约资金。为研究其可行性,在已有的大量静力和动力特性试验研究基础上,对该灰坝在地震荷载作用下的动力反应进行研究。研究中以Biot波动方程为基础,考虑水土动力耦合作用和土体和非线性性质,引入地震孔隙水压力和残余变形项,把动力分析与动力渗流、液化发展及骨架变形加以综合考虑。研究表明,7°地震烈度条件下用本文配制的粉煤灰代替砂作为排水垫层筑坝是可行的。

In order to study the possibility, for using flyash as the drainage blanket materials of dam, based on a series of static and dynamic laboratory tests the dynamic response of the dam under earthquake load was inverstigated Based on Biot wave theory, the interaction effects of water and soil and the nonlinear properties of soil were regarded. Several aspects such as dynamic analysis, dynamic permeability and development of liquefaction were considered comprehensively. Besides, the pore pressure and residual deformation were also introduced. The study confirm the feasibility of using flyash as the drainage blanket of dam.