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    淺析城區河道防洪工程設計
    RSS 打印 復制鏈接 發布時間:2019-06-13 10:36:04

     摘要:防洪工程涉及面廣, 與人民的生命財產安全息息相關, 是重要的基礎設施, 應基于工程布置區的周邊環境及經濟條件, 采用不同的設計方案。本文介紹某河道城區段防洪工程設計內容, 可為相關河道防洪治理設計提供參考。

      關鍵詞:防洪墻; 加固; 灌注樁;

      1 引言

      某河道橫穿縣城, 河道全長23km, 本次治理總長約7.8km, 本河道防洪標準為20年一遇, 設計防洪水位為11.27~12.03m, 堤防級別為3級, 上下游均已建防洪墻, 因征地拆遷等原因, 現遺留路橋上游43m未實施。本段現場建筑垃圾堆集, 雜草叢生, 且岸坡坡度較陡, 岸坡高度約4m, 居民房屋密集, 距坡頂約4.5m有5層樓的民房, 隨時都有塌坡的危險, 嚴重威脅防洪安全及城區環境, 為保障縣城人民的生命財產安全, 改善市民的生活環境, 本段治理是地區防洪保安的迫切需要。

      2 防洪墻工程設計

      2.1 工程地質條件
    擬建防洪墻工程區地震動峰值加速度為0.05g, 對應的工程區地震基本烈度為Ⅵ度。工程區地下水類型主要為孔隙潛水及孔隙承壓水;孔隙潛水主要分布于上部粉質壤土中, 孔隙承壓水主要賦存于下部的砂礫石夾碎石中。測得場地地下水埋深2.9~3.2m, 相應地下水位高程為8.16~8.45m;地下水位隨河水位變化而變化。結合現場原位測試及室內土工試驗成果, 場地地層可分為7層, 各土層特征敘述如下:
    雜填土:以建筑垃圾為主, 主要成分以碎石、塊石夾壤土為主, 局部含混凝土塊, 其中上部2.9m為灰巖堆筑。土層厚3.3~3.6m, 層底高程7.76~8.14m。
    (1) 層重粉質壤土 (Q4al) :呈褐黃夾灰色, 濕, 軟可塑~可塑。屬于中等偏高壓縮性土。土層厚0.9~1.3m, 層底高程6.84~7.21m。
    (2) 層重粉質壤土 (Q4al) :呈褐黃、灰黃、灰色, 很濕, 流塑~軟塑, 局部可塑;局部夾輕粉質壤土, 底部夾淤泥質重粉質壤土。屬高壓縮性土。層厚3.4~5.1m, 層底高程2.44~3.61m。
    (3) 層淤泥質重粉質壤土夾礫石 (Q4al) :灰色, 飽和, 軟塑/稍密, 礫石直徑1~15mm, 含量10%~30%。屬高壓縮性土。層厚0.5~2.2m, 層底高程1.41~2.86m。
    (4) 層砂礫石夾碎石 (Q4al) :夾壤土, 雜色, 飽和, 中密~密實, 礫石、碎石含量50%以上, 礫石直徑2mm左右, 碎石直徑4cm以上。屬低壓縮性土。該層未完全揭穿, 已揭露最大層厚6.8m, 最深層底高程-4.36m。
    (5) 1層全風化花崗巖 (K) :白、灰白色, 硬塑, 呈砂質粘性土狀。層厚2.5~3.4m, 層底高程-7.25~-6.44m。
    (5) 2層強~弱風化花崗巖 (K) :灰白色, 夾黑色斑點, 呈短柱狀或柱狀。該層未完全揭穿, 已揭露最大層厚3.1m, 最深層底高程-10.35m。
    2.2 方案選擇
    根據地形及現場勘查的情況, 對擬建堤防加固提出了以下三種方案。
    (1) 土堤方案:即迎水側按1∶3邊坡進行削坡, 按設計標斷面在背水側加培, 堤頂高程為設計洪水位, 迎水側設1.0m高防洪墻, 見圖1。該方案相對來講, 工程直接投資較小, 施工方便, 但占地和拆遷工程量和投資較大, 總體投資較大。

      (2) 仰斜式擋墻+防洪墻方案:即在堤防迎水側按1∶1開挖 (寬度需滿足施工和結構要求) , 澆筑C20砼仰斜式擋墻, 擋墻頂設1.0m高防洪墻, 墻頂高程滿足堤防超高要求, 堤頂不低于設計洪水位即11.27m;背水側與地面順接。同時, 為滿足穩定要求, 擋墻埋深不小于1.0m, 見圖2。該方案相對來講, 工程直接投資較大, 且堤后有5層民房, 需考慮支護, 施工難度一般, 拆遷工程量和投資, 總體較大。

    (3) 支護樁防洪墻方案:即在在靠近房屋邊緣4m外設置一排鋼筋砼鉆孔灌注樁;在灌注樁之間設置一排高壓旋噴樁進行防滲;灌注樁迎水側采用鋼筋砼罩面, 以減輕水流沖刷、減少水土流失和增加護岸的整潔美觀。在上述灌注樁及罩面前設親水平臺。親水平臺與道路采用臺階連接, 與現有防洪墻前平臺平順銜接。該方案相對來講, 工程直接投資稍大, 施工難度較高, 但占地工程量和投資小, 且能少占用河道, 景觀性較好, 總體投資稍大。

    三個方案工程量與投資比較詳見表1。

    綜合上述比較, 進一步從工程實施以及管理、拆遷以及占地、工程量及投資、景環境觀及上下游銜接等方面綜合考慮, 運漕鎮鎮區段、雍鎮段鎮區段本次加固擬采用方案三, 即支護樁防洪墻方案。
    2.3 灌注支護樁防洪墻方案布置及設計
    防洪墻設置二排鋼筋砼鉆孔灌注樁, 在靠近房屋側設置一排灌注樁直徑1.0m、間距1.2m, 灌注樁底高程為-4.03m, 樁頂設1.2m×0.8m (寬×高) 冠梁, 冠梁頂高程為11.7m;在灌注樁之間設置二排高壓旋噴樁進行防滲, 水泥旋噴樁直徑0.6m、間距1.2m, 靠近房屋側旋噴樁底高程為5.69m, 靠近河道側旋噴樁底高程為4.68 m;灌注樁迎水側采用0.8m厚鋼筋砼罩面, 以減輕水流沖刷、減少水土流失和增加護岸的整潔美觀。另外, 為便于市民親水、游憩, 擬在上述灌注樁及罩面前設2.5m寬親水平臺, 平臺高程為8.08m, 平臺為0.6m厚鋼筋砼平板結構, 并采用灌注樁支撐, 樁直徑1.0m, 間距2.8~3.0m, 樁底高程為-3.52m。親水平臺外側設1.2m高防腐實木欄桿;親水平臺與道路采用臺階連接, 與現有防洪墻前平臺平順銜接。
    考慮到該地區的人文地理條件, 提高居民的生活品質, 結合城市的遠景規劃, 本次防洪墻規劃設計在罩面側墻墻體上嵌入砂巖浮雕, 以地區的歷史文化、現代化建設為題材, 將其篆刻在浮雕上, 游人在休憩的同時, 便可感知地區的文化底蘊及現代發展。
    依據文獻[2]及地質資料, 利用理正深基坑軟件, 將樁視為剛性樁, 采用M法計算, 分為樁身的推力和庫侖壓力兩部分, 安全系數均為1.2。計算內力結果見表2、圖4。防洪墻最大位移 (拋物線法) 為20mm, 整體抗滑穩定安全系數最小為1.41, 抗傾穩定系數最小為1.54, 抗隆起穩定系數為6.0, 按照《建筑基坑支護技術規程》 (JGJ120-2012) 及《堤防工程設計規范》 (GB50286-2013) , 均滿足要求。


    2.4 防洪墻施工
    本支護樁防洪墻主要施工步驟為:鉆孔灌注樁 (靠河側) 施工→鉆孔灌注樁 (靠房屋側) 施工 (二序法) →旋噴樁施工 (二序法) →澆筑樁頂冠梁→開挖至7.48m高程→澆筑0.6m厚平臺板→澆筑砼罩面→開挖至河底高程。
    2.4.1 灌注樁施工
    本次灌注樁必須采用旋挖鉆施工, 不得采用沖擊鉆, 且應采取間隔成樁施工, 并應在混凝土終凝后才可進行鄰樁施工。在造孔施工過程中應采取有效護壁措施, 嚴防塌孔。清孔后應盡快吊放鋼筋籠, 澆注水下砼。灌注樁樁底沉渣厚度≤50mm。成樁后, 所有樁體采用低應變法檢測樁身完整性, 不少于50%樁體采用超聲波復測其完整性。
    2.4.2 高壓旋噴樁施工
    施工前結合各土層分布高程, 嚴格進行旋噴施工工藝試驗, 并根據工藝試驗結果進一步優化調整詳細施工控制參數。旋噴樁鉆孔孔位允許偏差不得大于3cm, 孔斜率不得大于0.5%, 鉆孔采用泥漿護壁, 孔深超過設計樁底。
    2.4.3 鋼筋砼罩面施工
    首先清理表面土體, 然后綁扎鋼筋, 且鋼筋應與帽梁伸出鋼筋綁扎在一起, 然后澆筑混凝土, 鋼筋綁扎采用Φ16@200三級鋼筋, 混凝土強度為C25。
    2.4.4 施工注意事項
    施工時應該嚴格按照施工的工序進行施工, 待灌注樁以及帽梁達到設計強度時才可進行土方開挖, 并且做好對灌注樁主體結構、附近建 (構) 筑物 (包括房屋、管道) 等進行全過程的監測。

      3 結語

      本工程主體部分已基本完工, 工程施工對周邊建筑物影響很小, 防洪墻結構設計方案做到了經濟合理, 因地制宜, 有效的改善了該段河道的防洪安全及周邊環境, 可供類似工程設計參考。

      參考文獻
    [1]建筑基坑支護技術規程.[S].JGJ120-2012.
    [2]黃峰, 付挺, 楊智本.抗滑樁的原理及其設計[J].山西建筑, 2007, 33 (1) :106-107.
    [3]堤防工程設計規范.[S].GB50286-2013.
    [4]李榮峰.抗滑樁設計計算方法研究[D].西安:長安大學碩士學位論文, 2006.
    [5]繁昌縣西門河左岸防洪墻工程簡要設計說明, 安徽省水利水電勘測設計院, 2016.

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