HDPE土工膜用于水库防渗适用条件
土(tu)工薄(bo)膜防渗(shen)(shen)技术主要应用(yong)(yong)在由于坝土(tu)质量(liang)(liang)、防渗(shen)(shen)性能、施工质量(liang)(liang)等较差而引(yin)起(qi)水库大(da)面积漏(lou)水，尤其(qi)是(shi)针对运输不便、材料(liao)短缺的(de)水库防渗(shen)(shen)加固(gu)(gu)工程，选择合(he)适的(de)土(tu)工薄(bo)膜材料(liao)应用(yong)(yong)于上游坡(po)防渗(shen)(shen)加固(gu)(gu)环节，该防渗(shen)(shen)技术方式相对经济合(he)理，坝基漏(lou)水可采用(yong)(yong)垂直(zhi)铺塑防渗(shen)(shen)技术。值(zhi)得注意的(de)是(shi)，坝体(ti)局部(bu)漏(lou)水不适合(he)采用(yong)(yong)土(tu)工薄(bo)膜防渗(shen)(shen)技术。
水库防渗加固工程中防渗膜料的选择与水库防渗系统工程成本及安全性密切相关，选择土工薄膜应综合考虑各种膜料的性能、价格、质量、使用寿命等因素，现阶段辽宁省主要依据水库防渗加固工程实际情况，围绕水库防渗膜料的安全系数、耐用性等选择性价比相对较高的PE复合土工膜。相较于塑料薄膜，PE复合土工薄膜的使用寿命长较长、价格稍高，相较于RmPVC合金膜，PE复合土工薄膜摩擦系数较大、价格相差不大，且力学性能较好，使用寿命较长，抗破损能力强，尤其PE复合土工薄膜的种类性能较全、排水性好、整体性能稳定，另外，相较于其他土工薄膜材料而言，PE复合土工膜对垫层的匹配要求不高，且PE复合土工膜的形变能够快速分散
由于垫层(ceng)凹凸(tu)造成的(de)(de)应力(li)，并有效分(fen)散(san)水(shui)体触面(mian)的(de)(de)浮托力(li)及孔隙(xi)压力(li)。
水(shui)库(ku)防(fang)(fang)(fang)(fang)渗加(jia)固(gu)工(gong)(gong)(gong)(gong)程(cheng)精(jing)细化施(shi)(shi)(shi)工(gong)(gong)(gong)(gong)也是(shi)确(que)保(bao)(bao)(bao)水(shui)库(ku)防(fang)(fang)(fang)(fang)渗工(gong)(gong)(gong)(gong)程(cheng)质(zhi)量(liang)的重(zhong)要环节，在(zai)进(jin)行(xing)实际水(shui)库(ku)防(fang)(fang)(fang)(fang)渗加(jia)固(gu)过(guo)程(cheng)中，应(ying)以确(que)保(bao)(bao)(bao)工(gong)(gong)(gong)(gong)程(cheng)质(zhi)量(liang)为前(qian)提(ti)展开施(shi)(shi)(shi)工(gong)(gong)(gong)(gong)工(gong)(gong)(gong)(gong)作(zuo)，施(shi)(shi)(shi)工(gong)(gong)(gong)(gong)前(qian)仔细筛(shai)查(cha)(cha)(cha)(cha)铺膜(mo)基面是(shi)否平整，施(shi)(shi)(shi)工(gong)(gong)(gong)(gong)中严(yan)格检(jian)查(cha)(cha)(cha)(cha)验(yan)收环节，始终确(que)保(bao)(bao)(bao)土工(gong)(gong)(gong)(gong)薄(bo)膜(mo)完(wan)整性(xing)，严(yan)防(fang)(fang)(fang)(fang)老化及(ji)破(po)损，及(ji)时修补破(po)损处，并确(que)保(bao)(bao)(bao)豁结处连(lian)接紧密。施(shi)(shi)(shi)工(gong)(gong)(gong)(gong)后(hou)应(ying)不(bu)定期查(cha)(cha)(cha)(cha)看保(bao)(bao)(bao)护(hu)层及(ji)垫层土料质(zhi)量(liang)、固(gu)埋沟及(ji)排水(shui)槽(cao)尺寸、回(hui)填(tian)土回(hui)填(tian)状况等(deng)。水(shui)库(ku)防(fang)(fang)(fang)(fang)渗加(jia)固(gu)工(gong)(gong)(gong)(gong)程(cheng)验(yan)收运行(xing)阶(jie)段，应(ying)定期进(jin)行(xing)排查(cha)(cha)(cha)(cha)管理，及(ji)时发(fa)现土工(gong)(gong)(gong)(gong)薄(bo)膜(mo)保(bao)(bao)(bao)护(hu)层裂缝、下陷、滑动等(deng)，并有针对性(xing)地进(jin)行(xing)修缮(shan)，提(ti)高土工(gong)(gong)(gong)(gong)薄(bo)膜(mo)保(bao)(bao)(bao)护(hu)层的稳(wen)定性(xing)，使水(shui)库(ku)防(fang)(fang)(fang)(fang)渗加(jia)固(gu)工(gong)(gong)(gong)(gong)程(cheng)发(fa)挥最佳防(fang)(fang)(fang)(fang)渗作(zuo)用。
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