[摘要]要防治凍害,主要是降低地下水位和改善路基的排水,用鋼塑土工格柵修筑滲溝來降低地下水位效果顯著。
在防治凍害方面有著顯著效果:
要(yao)防(fang)治(zhi)凍(dong)害,主要(yao)是(shi)降低(di)地下(xia)水(shui)(shui)(shui)位和改善(shan)路(lu)基的排水(shui)(shui)(shui),用(yong)鋼塑(su)土工(gong)(gong)(gong)格柵修筑(zhu)滲溝來降低(di)地下(xia)水(shui)(shui)(shui)位效果顯(xian)著。同時(shi),鋼塑(su)土工(gong)(gong)(gong)格柵在路(lu)基中(zhong)的分離和排水(shui)(shui)(shui)作(zuo)(zuo)用(yong),會中(zhong)斷(duan)路(lu)基中(zhong)水(shui)(shui)(shui)分移動的毛細作(zuo)(zuo)用(yong),特別是(shi)凍(dong)結時(shi)水(shui)(shui)(shui)分向結凍(dong)區的聚集,防(fang)止了凍(dong)脹的形成。當春融時(shi),鋼塑(su)土工(gong)(gong)(gong)格柵又阻擋了土壤微粒隨水(shui)(shui)(shui)分上冒(mao)而(er)形成翻漿(jiang)。
防治道(dao)床(chuang)翻槳冒泥主要是(shi)做好道(dao)床(chuang)的(de)(de)排水工(gong)作。傳統的(de)(de)方法是(shi)在路(lu)墓和(he)道(dao)碴之間鋪(pu)設砂(sha)墊(dian)(dian)層,加強路(lu)墓的(de)(de)排水,并使碎(sui)石道(dao)渣傳來的(de)(de)動應力(li)均勻(yun)地(di)分布(bu)在路(lu)基(ji)上,減(jian)少動力(li)沖擊和(he)應力(li)集中對道(dao)碴的(de)(de)粉碎(sui)作用,從而減(jian)少翻槳胃泥。但是(shi)隨著運(yun)輸量的(de)(de)增加,墊(dian)(dian)砂(sha)地(di)段(duan)又會重新出(chu)現病害。降低線路(lu)質(zhi)量,增加日常養護維修工(gong)作,嚴重時(shi)會影響行(xing)車速度和(he)行(xing)車安(an)全。
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