管井降水專項施工方案

管井降水專項施工方案目錄TOC\o"1-5"\h\z一、編制依據(jù)1二、工程地質(zhì)及水文概況12.1、工程概況12.2、水文地質(zhì)概況22.3、地基土滲透性3三、降水設(shè)計方案43.1、設(shè)計說明43.2、設(shè)計參數(shù)及管網(wǎng)組成43.3、降水井平面布置4四、施工計劃44.1、測量放線44.2、施工用電、用水配置54.3、施工進(jìn)度計劃（從開工令下發(fā)算起）54.4、打井機(jī)械及井點設(shè)備54.5、人員的組織及安排6五、施工工藝7六、降水井質(zhì)量要求10七、降水過程的控制10八、降水工程質(zhì)量保證措施118.1、降水管理118.2、施工技術(shù)措施118.3、生產(chǎn)設(shè)備準(zhǔn)備118.4、質(zhì)量措施12九、成品保護(hù)及環(huán)保措施12十、降水對周圍環(huán)境影響及防治措施1310.1、對周圍環(huán)境的影響1310.2、防范措施13十一、主要安全技術(shù)措施14十二、基坑降水應(yīng)急預(yù)案15十三、計算書1613.1、計算依據(jù)1613.2、水文地質(zhì)資料1613.3、管井降水1計算書1613.4、管井降水2計算書18第第#頁共22頁基坑降水示意圖根據(jù)基坑邊界條件選用以下公式計算：Q=1.366k(2H0-S)S/lg[(R+ro)/ro]=1.366*8*(2*30-2)*2/lg[(61.968+66.700)/66.700]=4442.528m3/dR=2S(kH)1/2=2*2*(8*30)1/2=61.968mro=1.16(a+b)/4=1.16*(148+82)/4=66.700mQ為基坑涌水量(m3/d)；k為滲透系數(shù)(m/d)；H為潛水含水層厚度(m)；H0為非完整井有效含水層厚度(m)；R為引用影響半徑(m)；r0為基坑半徑(m)；S為水位降深(m)；a、b分別為基坑的長、寬(m)；通過以上計算可得基坑日總涌水量為4442.528m3。3、降水井?dāng)?shù)量確定：單井出水量計算：q0=120nrslki/3=120*n*0.2*15.*8i/3=226.195m3/d降水井?dāng)?shù)量計算：n=1.1Q/q0=21.6q0為單井出水能力(m3/d)；

rs為過濾器半徑(m)；l為濾管進(jìn)水部分長度(m)；k為含水層滲透系數(shù)(m/d)。通過計算得井點管數(shù)量為22個。管井降水界面參數(shù)表一、基本參數(shù)管井類型選擇疏干井管井半徑Y(jié)w(m)0.2基坑開挖類型放坡開挖矩形或近似矩形基坑的長(m)143(148)矩形或近似矩形基坑的寬(m)112(82)基坑邊界條件潛水層非完整井降水深度(m)2基坑開挖深度D(m)1.5基坑中心處水位與基坑設(shè)計開挖面的距離Sw(m)1地下靜水位埋深dw(m)0.5含水層厚度H(m)30設(shè)計降水面到潛水層底面的距離h(m)28二、土層參數(shù)土層編號-土層名稱細(xì)砂土層埋深(m)30土層厚度(m)30容重(kN/m3)19.5粘聚力(kPa)0滲透系數(shù)k(m/d)8平均粒徑(mm)-

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