HDPE土工(gong)膜的(de)使(shi)(shi)(shi)用壽命有時也在(zai)于鋪(pu)設(she)方法，和鋪(pu)設(she)廠地，以(yi)及其(qi)它影響因素。 HDPE土工(gong)膜的(de)使(shi)(shi)(shi)用年限問題，主要(yao)是由塑料薄膜是否失(shi)去防滲(shen)隔(ge)水作用而定，據蘇聯國(guo)家標準規定，水工(gong)用的(de)厚度為(wei)0.2m的(de)加(jia)穩定劑的(de)聚乙烯薄膜，在(zai)清水條(tiao)件下工(gong)作年限可達40~50年，在(zai)污(wu)水條(tiao)件下工(gong)作年限為(wei)30~40年。因此(ci)復合土工(gong)膜的(de)使(shi)(shi)(shi)用年限足以(yi)滿(man)足大壩防滲(shen)要(yao)求的(de)使(shi)(shi)(shi)用年限。

HDPE土(tu)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)膜(mo)(mo)的(de)鋪(pu)設應(ying)(ying)在干燥和暖天色(se)進(jin)行(xing)，為了便(bian)于(yu)拼(pin)接(jie)，防止應(ying)(ying)力(li)集中(zhong)，復合(he)土(tu)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)膜(mo)(mo)鋪(pu)設采用波浪形松(song)馳(chi)方式(shi)，富(fu)余度(du)約為1.5%，攤開(kai)后及時拉(la)平(ping)，拉(la)開(kai)，要求復合(he)土(tu)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)膜(mo)(mo)與坡面吻合(he)平(ping)整，無突起(qi)褶皺，施(shi)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)職員應(ying)(ying)穿(chuan)平(ping)底布(bu)(bu)(bu)鞋(xie)或(huo)軟膠鞋(xie)，嚴禁穿(chuan)釘鞋(xie)，以免踩壞(huai)土(tu)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)膜(mo)(mo)，施(shi)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)時如發(fa)現土(tu)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)膜(mo)(mo)損壞(huai)，應(ying)(ying)及時修補。 施(shi)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)時，應(ying)(ying)盡力(li)避免石塊直接(jie)砸在HDPE土(tu)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)膜(mo)(mo)上，最好是邊(bian)(bian)鋪(pu)膜(mo)(mo)邊(bian)(bian)進(jin)行(xing)保護層的(de)施(shi)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)。這樣也會增加(jia)復合(he)土(tu)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)膜(mo)(mo)的(de)壽命，復合(he)土(tu)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)膜(mo)(mo)與周邊(bian)(bian)結構物連接(jie)應(ying)(ying)采用膨脹螺栓和鋼板壓條(tiao)錨(mao)固，連接(jie)部位要涂刷乳化(hua)瀝青（厚2mm）粘接(jie)，以防該處發(fa)生滲漏。用不(bu)(bu)同的(de)編制編織(zhi)設備和工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)藝將經紗與緯(wei)(wei)紗交織(zhi)在一起(qi)織(zhi)成布(bu)(bu)(bu)狀，可根據不(bu)(bu)同的(de)使(shi)用范圍編織(zhi)成不(bu)(bu)同的(de)厚度(du)與密實度(du)，一般有(you)紡(fang)土(tu)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)布(bu)(bu)(bu)較薄(bo)縱橫向(xiang)都具(ju)有(you)相當強的(de)抗拉(la)強度(du)（經度(du)大(da)于(yu)緯(wei)(wei)度(du)），具(ju)有(you)很好的(de)穩定性能。有(you)紡(fang)土(tu)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)布(bu)(bu)(bu)根據編織(zhi)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)藝和使(shi)用經緯(wei)(wei)的(de)不(bu)(bu)同分為加(jia)筋土(tu)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)布(bu)(bu)(bu)和不(bu)(bu)加(jia)筋土(tu)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)布(bu)(bu)(bu)兩大(da)類，加(jia)筋土(tu)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)布(bu)(bu)(bu)的(de)經向(xiang)抗拉(la)強度(du)遠遠大(da)于(yu)普通土(tu)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)布(bu)(bu)(bu)。

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