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      歡迎來到肥城聯誼工程塑料有限公司!
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      玻璃纖維土工格柵對路基工程的穩定作用
      日期:2020年 11月 25日 共閱:256次 文章來源:山東肥城聯誼工程塑料有限公司
            多年凍土是一種不同于常規土體的特殊土體 ,由于表面受到太陽的照射,產生一定的融化,然后隨季節的變化產生一種凍融過程 ,在這一過程中會發生各種凍土地質現象 ,對公路的路基施工造成了非常大的難度。而土工格柵是一種土工合成材料,在凍土區使用能夠對公路的路基起到防塌作用,保證公路路基的正常使用。此外 ,通過該材料的使用 ,還能減少對凍土區的融沉現象,防止公路路基出現裂縫 而影 響其正常使用 。
             玻璃纖維土工格柵主要用于冰封沼澤和濕地地基的處理,以及融冰湖、塘子和多年凍土區路基邊坡的柔性保溫防護措施。試驗結果表明,在上述工程中使用玻璃纖維土工格柵是可行的。物理測試結果表明,高溫下的材料強度遠低于低溫下的材料強度,而負溫循環下的材料強度遠高于常溫下的材料強度,延伸率較低,說明玻璃纖維塑料土工格柵材料更適合多年凍土地區。
            玻璃纖維土工格柵層對防止路基(路堤)縱向裂縫,提高路基(路堤)整體性和不均勻沉降有明顯效果.高含冰量路堤地段也采取了加固措施。實際試驗結果表明,玻璃纖維土工格柵路堤的變形比非路堤更均勻.結果表明,玻璃纖維塑料土工格柵對應力的均勻分布起著重要作用。在多年凍土地區的一些路塹邊坡防護中,也采用了加固型上部邊坡防護結構.初步實踐表明,在高寒地區凍融環境下,護坡結構能滿足邊坡穩定等方面的使用要求。擋土墻采用高密度聚乙烯格柵和(高強度)格柵,需要200次低溫-45℃凍融循環,抗拉強度不低于設計值。
            1.首先精確放出路基邊坡線,為了保證路基寬度,每側各加寬0.5m,把晾曬好的基底土進行整平后用25T振動壓路機靜壓兩遍,再用50T震壓四遍,不平整的地方人工配合整平。 
            2.鋪墊0.3m厚的中(粗)砂,人工配合機械整平后,25T的振動壓路機靜壓兩遍。
            3.鋪設土工格柵,土工格柵鋪設時底面應平整、密實,一般應平鋪,拉直、不得重疊,不得卷曲、扭結,相鄰的兩幅土工格柵需搭接0.2m,并沿路基橫向對土工格柵搭接部分每隔1米用8號鐵絲進行穿插連接,并在鋪設的格柵上,每隔1.5-2m用U型釘固定于地面。
            4.第一層土工格柵鋪好后,開始填設第二層0.2m厚的中(粗)砂,其方法:汽車運砂到工地卸于路基一側,而后用推土機向前趕推,先把路基兩側2米范圍內填筑0.1m后,把第一層土工格柵折翻上來再填上0.1米的中(粗)砂,禁止兩側向中間填筑和推進,禁止各種機械在沒有填筑中(粗)砂的土工格柵上通行作業,這樣能保證土工格柵平整,不起鼓,不起皺,待第二層中(粗)砂平整后,要進行水平測量,防止填筑厚度不均勻,待抄平無誤后用25T振動壓路機靜壓兩遍。 
            5.第二層土工格柵施工方法同第一層方法一樣,最后再填筑0.3m的中(粗)砂,填筑方法同第一層一樣,用25T壓路機靜壓兩遍后,這樣路基基底加固就處理完畢。
            6.在第三層中(粗)砂碾壓好后,沿線路縱向在邊坡兩側各鋪設土工格柵兩幅,搭接0.16m,并用同樣方法連接好,然后開始土方施工作業,鋪設土工格柵進行邊坡防護,必須每層測量出鋪設的邊線,每側要保證邊坡整修后土工格柵埋于邊坡內0.10m。

            7.邊坡土工格柵每填筑兩層土,即厚度0.8m時就需兩側同時鋪設一層土工格柵,然后以此類推,直至鋪到路肩表面土下。 

      玻璃纖維土工格柵

            8.路基填筑好后,及時進行邊坡整修,并進行坡腳的干砌片石防護,對該段路基除每側加寬0.3m外,并預留1.5%的沉落量。
            對于多年凍土區,其地址主要表現為融沉和凍脹等現象,在融沉過程中,融土會隨著凍結過程的發生而產生體積脹大的現象,且在這一過程中會出現水分的遷移,導致土骨架產生一定的位移量,從而對融土的結構造成一定的改變。相反,在融化過程中,凍土中含有的冰會發生融化現象,從而增加凍
      土中的剩余空間,導致產生融化下沉問題。對于多年凍土,其在短期的荷載情況下不會發生壓縮『生改變或者改變很小,一般情況下不會對其進行考慮,但對于長期荷載作用,其形變量是非常大的。兩種情況下的形變量相差幾乎在十幾倍以上,對于多年凍土,其在融化完全之后和一般的土質幾乎一樣。
             而在采用土工格柵工藝之后,荷載作用產生的壓力會促使土工格柵和地基之間的摩擦力增大,然后通過土體中的拉應力作用將這些荷載力全部轉移到鋼筋體上,鋼筋體在承受了拉力作用之后,其間的土體所承受的壓力會和鋼筋體之間產生作用,導致兩者之間的黏聚作用和嵌固作用更加明顯,增加土體內的土質密度,保證公路路基的整體性,這對公路路基的穩定陛具有較大的提高。
            相信大家看完以上內容以后,應該也對玻璃纖維土工格柵對路基工程的穩定作用有所了解了,希望會對大家有所幫助吧。
            本文詞標簽:玻璃纖維土工格柵
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