桓仁单支墩大头坝安全性评价

Safety Evaluation on Huanren Massive-head Single Support Pier Dam

在桓仁大坝共发现裂缝2 084条,其中上游面的劈头缝威胁大坝安全。为此,先后采取在上游面做防渗层、背面打"砂浆棒"、对封腔盖板进行改造等一系列工程措施。采取措施后,现场检查和监测表明,大坝渗漏水明显减少,坝腔温度升高、温差变幅减小,劈头裂缝稳定。大坝三次安全定期检查均被评定为正常坝。

2084 cracks are found on Huanren dam, among which cleavage cracks in upstream surface threatens the saiety ot the dam. As a result, a series engineering measures are taken such as construction of seepage-prevention layer, of mortar bar on the backside and the modification of seal cavity cover-plate. After all these measures, field checkup and monitoring shows that water penetration decreased obviously, temperature of dam cavity raised, temperature difference minimized, cleavage cracks remained stable. The dam is assessed normal in the following three periodic checkups.