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      歡迎來到肥城聯誼工程塑料有限公司!
      熱門關鍵詞: 單向土工格柵| 滌綸土工格柵| 土工格柵| 山東土工格柵廠家| 肥城聯誼工程塑料有限公司|
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      土工格柵高填方邊坡治理方案
      日期:2019年 12月 26日 共閱:775次 文章來源:山東肥城聯誼工程塑料有限公司
          隨著保護基本農田的政策得到廣泛落實,基本建設項目(如變電站項目等)中高填方邊坡工程越來越普遍。高填方邊坡支擋防護形式多種多樣,如放坡(占地較大)、重力式擋墻(高度超過8m 后經濟性相對差些)、混凝土扶壁式擋墻(費用較高)、土工格柵加筋技術等,其中土工格柵加筋技術造價低、環保,成為近年常被采用的高填方邊坡支擋防護形式之一。土工格柵加筋技術在高填方邊坡工程中的應用雖然越來越多。但其中也存在一些常被忽視的重要問題和一些值得商榷的做法。
          為節約占地,常在土工格柵加筋場地范圍內布置建(構)筑物,而不同的地基處理方案對筋帶造成不同的局部損壞,對加筋土體邊坡造成不利影響,所以有必要分析討論這些影響情況,以便采取相應措施,有利于高填方加筋邊坡的整體穩定。
          對于土工格柵加筋高回填區域,當采用人工挖孔灌注樁時,施工中必須截斷筋帶,造成這部分筋帶的作用喪失,是否需要增加筋帶來彌補截斷的筋帶。經過分析,采取了在挖孔樁樁徑范圍內的土工格柵筋帶由人工剪斷,并在樁體混凝土澆筑時,將筋帶澆筑在鋼筋混凝土樁體內,筋帶與樁很好地結合在一起,這時,錨入挖孔樁的一側筋帶將水平荷載傳給挖孔樁,樁又將水平荷載傳給另一側的筋帶,挖孔樁并沒有真正承受水平荷載。也就是說,在采用挖孔樁處理地基時,筋帶的受力作用沒有改變,不需要增加筋帶,邊坡安全穩定不受影響。
          旋挖灌注樁施工過程中旋斷筋帶,施工控制得好則影響不大,即對樁以外范圍加筋土結構幾乎沒有影響或影響很小,但應考慮旋斷筋帶造成此處筋帶截面減?。ㄍㄟ^了解多個實際工程,這種減小很有限),應在設計時注意這一問題,并通過增大周邊的筋帶來解決。在500kv草鋪變擴建、500kv仁和開關站等工程采用過。
          沉管灌注樁、長螺旋灌注樁、沖擊成孔灌注樁在施工過程中產生較大的沖擊力,沖斷土工格柵筋帶,易產生隨意撕扯,造成周邊較大范圍內土體破壞。且沖擊鉆施工時,需要用泥漿護壁成孔,對現場施工環境影響較大,土體的抗剪強度降低,樁以外加筋土結構的整體穩定性受到影響。因此,土工格柵平面布置范圍內,不宜采用沉管灌注樁、沖擊鉆成孔灌注樁和長螺旋灌注樁等類樁,如若一定要采用,應有充分經驗,采取可靠的設計和施工處理措施,確保樁基對回填土中的筋帶不產生不利影響。
          1.當邊坡較高且下伏土層抗剪指標較差時,應注意僅靠土工格柵方案可能不經濟,應與換填、復合地基、抗滑樁等方案進行技術經濟比較,結合采用。
          2.對于有土工格柵加筋帶的回填區域,應考慮樁基選型對土工格柵的不利影響。 
          ① 人工挖孔灌注樁施工中截斷土工格柵再澆筑在樁身中對邊坡安全穩定沒有不利影響。 
          ② 不宜使用沉管灌注樁、沖擊成孔灌注樁、長螺旋灌注樁等易對樁身周邊較大范圍的土工格柵產生損壞的成孔工藝。 
          ③ 旋挖灌注樁施工中截斷的格柵,一般可增加樁兩側的格柵或在格柵設計時留有余地。
          3.當坡腳下采用換填碎石層且周圍巖土層為粘土類(滲水性不好)時,雨季期間碎石層形成的積水不能及時排出,會降低周邊土體強度,易發生剪切破壞甚至邊坡局部失穩。應設置碎石排水盲溝將水引出或采用剛性基礎解決承載力不足問題,避免邊坡局部失穩。

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