土工膜膜下排水、排气措施

为有效排(pai)出库岸边坡及(ji)库盆土工膜， 膜下渗水及(ji)气体(ti)，保证运行期(qi)土工膜安全，自库尾开挖(wa)1.5m×1m 梯形槽(cao)， 设置基(ji)础一根 DN500 排(pai)水 PVC花(hua)(hua)管，自坝轴线上游 254m 处至(zhi)坝趾处，沿河(he)谷两侧(ce)设置环形主排(pai)水 PVC 花(hua)(hua)管， 与坝趾处设置的PVC 排(pai)水花(hua)(hua)管相(xiang)接，统一汇至(zhi)输(shu)(shu)水隧(sui)洞(dong)(dong)进口(kou)处，由DN500 钢管引至(zhi)输(shu)(shu)水隧(sui)洞(dong)(dong)出口(kou)。

库岸(an)埋设(she)(she)排(pai)水(shui)(shui)(shui)盲(mang)管(guan)(guan)(guan)及通(tong)(tong)气(qi)管(guan)(guan)(guan)对土工膜进行排(pai)水(shui)(shui)(shui)、通(tong)(tong)气(qi)减压，排(pai)水(shui)(shui)(shui)盲(mang)管(guan)(guan)(guan)间距为 30m，施工过程(cheng)中冲沟以及地下水(shui)(shui)(shui)渗漏(lou)点可以根据实(shi)际情况设(she)(she)置(zhi)双排(pai)排(pai)水(shui)(shui)(shui)盲(mang)管(guan)(guan)(guan)或者随机(ji)加密排(pai)水(shui)(shui)(shui)盲(mang)管(guan)(guan)(guan)， 排(pai)水(shui)(shui)(shui)盲(mang)管(guan)(guan)(guan)采用(yong)DN110 排(pai)水(shui)(shui)(shui)盲(mang)管(guan)(guan)(guan)，通(tong)(tong)气(qi)管(guan)(guan)(guan)采用(yong)DN110PVC 管(guan)(guan)(guan)，库岸(an)左(zuo)岸(an)、右岸(an)各设(she)(she)置(zhi) 4 道通(tong)(tong)气(qi)孔，并在坝面设(she)(she)置(zhi)一道通(tong)(tong)气(qi)管(guan)(guan)(guan)以保证主(zhu)排(pai)水(shui)(shui)(shui)管(guan)(guan)(guan)排(pai)水(shui)(shui)(shui)顺畅。