某电站工程设计变更防洪堤渗流稳定分析

Seepage stability analysis of dike design alteration of a hydropower station project

为了验证某电站工程防洪堤结构设计变更的可行性与合理性,采用水工结构有限元分析软件Autobank对某区两段2级堤防进行渗流稳定计算分析,结果表明:①两段堤防的渗流出口最大渗透坡降分别为0.051和0.033,均在允许坡降范围内;②防洪堤的单宽渗流量和累计渗流量很小,对电站库区蓄水没有影响;③两段堤防在3种不同运行工况下的边坡安全系数均大于规范要求的最小值。说明本次两段堤防的结构变更设计是合理可行的。

In order to verify the feasibility and rationality of structural design modification of flood dike in a hydropower station, the finite element analysis software Autobank is used to calculate and analyze seepage stability of two-stage dike in a certain area. The results show that:①the maximum seepage gradient at the outlet of two-stage dike is 0.051 and 0.033, respectively, which are within the allowable gradient range;②the single-width seepage discharge and the permissible gradient of the dike;The cumulative seepage flow is very small, which has no effect on the reservoir water storage.③The slope safety factors of the two sections of embankment under three different operating conditions are greater than the minimum required by the code. It shows that the structural change design of the two levees is reasonable and feasible.