渗流反分析在柴河土坝防渗加固设计中的应用

Application of seepage inversion analysis to seepage control reinforcement in Chaihe earth dam

通过对柴河水库大坝长期观测数据的分析,发现大坝右坝段及坝肩部位存在渗漏破坏的危险性。为提出合理的防渗加固措施,首先,根据渗流正常坝段实测数据,进行反演分析,得到坝体渗透参数;按得到的渗透参数推求坝体渗流量,并与实测数据对比校核,验证反演分析方法的合理性;然后,把正常坝段的合理渗流量作为设计渗流量,通过反分析法,得出渗漏坝段的渗透参数,为水库土坝的防渗加固提供设计依据;最后,针对大坝的渗漏状况,提出了土工膜和排水棱体的防渗加固措施,并对加固前后的渗流量进行了对比,证明了防渗加固方法的有效性。对同类工程具有参考作用。

Based on analysis of long-term observation data of Chaihe reservoir dam,seepage was found at right bank and dam abutment monoliths.In order to put forward rational seepage control reinforcement measures,firstly,inversion analysis was conducted on the basis of actual seepage measurements at normal dam monoliths to obtain dam permeable parameters,and then dam seepage discharge was calculated by the permeable parameters;the calculated and measured values were compared to confirm the rationality of inversion method.Taking reasonable seepage discharge at normal dam monolith as designed value,permeable parameters of seepage dam monoliths were computed with inversion analysis to provide design references to seepage control reinforcement of the earth dam.Finally,according to the seepage condition of the dam,the stability of one reinforcement scheme is studied,which shows validity of the seepage control reinforcement measure.