桓仁单支墩大头坝劈头裂缝稳定性分析

Stability analysis on abutment cracks of Huanren single supporting pier solid-head buttress dam

桓仁大坝上游面施工期发现严重的劈头缝20条,威胁大坝安全。因此,蓄水前在上游面做了防渗层,并在背面做了"砂浆棒"。1981年又发现新劈头缝8条,扩展的11条。为此,采用沥青混凝土对原防渗层加高,采用沥青席进行坝顶平面防渗,对封腔盖板用膨胀珍珠岩进行改造。采取这些加固措施后,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。

There were 20 cracks at upstream face dam head of Huanren dam during construction which threatened dam safety. So that upstream anti-seepage layer and mortar bar at the back were made before impounding. In 1981, 8 new cracks were found and 11 old cracks had expanded. According to this, measures were taken that highered the anti-seepage layer with asphalt concrete, made dam crest anti-seepage layer with asphalt felt and recast the capping plate with expansion perlite. After these measures, site inspection and monitoring showed that the dam seepage decreased, dam temperature rose, temperature difference minimized and the cracks turned stable.