三、土方工程施工方案.doc

根據現場場地及施工安排，基坑四周均采用放坡，坡度為1:0.2，邊坡采用土釘墻錨噴支護。土方開挖采用機模大開挖，人工配合清除基底預留土層。機械挖土方量170136m3，人工挖土方量1925m3。
3.施工部署
根據隆水觀測情況，滿足開挖條件后，開始按由西向東的行走方向開挖。采用三臺WY160型反鏟挖土機，20輛翻斗運土車，一臺汽車吊（人工清理基底土層時吊運基坑內土體），具體步驟如上：
4、操作工藝
4.1土方開挖工程
4.1.1先放好坡頂線、坡底線，經復測及驗收合格后開媽開挖。
4.1.2機械挖土分三大步進行，第一步挖3.5m，第二步挖4.5m,第三部挖4.8m。預留20cm土層人工清理。（詳見基坑開挖剖面圖）
4.1.3第一步先挖去面層渣土層至自地坪下2m，自西向東進行，開挖時邊坡預留20cm人工清理。再挖基坑中心基土至-3.5m，四周預留8m，做土釘墻錨桿施工的作業面，隨挖土隨修整喧坡，并進行邊坡土釘墻施工（詳見降水護坡方案）。待第一步土釘墻混凝土達到充許強度（通常在土釘墻混凝土噴射完成后12h），挖除第一部四周預留的作業面土層，隨挖土隨修整喧坡，并進行邊坡土釘墻混凝土噴 射完居后12h），挖除第一部四周預留的作業面土層，隨挖土隨修整喧坡，并進行坡土釘墻施工。
4.1.4第一步挖土結束，待土釘墻混凝土達到允許強度后開始第二步
Site and construction of the arrangement according to the site, are used around the foundation Slope, gradient 1:0.2 slope using soil nailing anchor support. Large scale earth excavation by machine excavation, soil and artificial clear basal reserved. Mechanical excavators side volume 170136m3, the amount of artificial earth digging 1925m3.
3. Construction of the deployment
Long observation under conditions of water to meet the excavation conditions, started walking from west to east direction of excavation. With three WY160-type backhoe, 20 dump trucks of earth, a mobile crane (to clean up the basement foundation soil within the soil when lifting), the specific steps as above:
4, the operation process
4.1 Earthwork Excavation
4.1.1 first put away crest line, slope the bottom line, and the acceptance by the retest after the mother open excavation.
4.1.2 Mechanical excavators were three big first step in digging 3.5m, the second step dug 4.5m, third dig 4.8m. 20cm of soil set aside to clean up. (See profile excavation)
4.1.3 The first step surface muck dredged from the floor level under 2m, from west to east to, excavation slope reserved 20cm to clean up. Foundation Center-based soil and then dug to-3.5m, earmarked around 8m, so soil nail wall surface anchor construction operations, finishing with a noise slope with an excavator, and the slope of soil nail wall construction (see precipitation Slope Programme ). Soil nail wall to be the first step to achieve full promise strength concrete (usually in the soil nail wall after concrete jet 12h), excavation around the first layer of work space set aside, with the dressing with a noise slope excavation, and the slope Soil Nail Wall concrete jet End home after 12h), reserved for excavation work around the first surface layer, finishing with an excavator with a noise slope, and soil nailing for slope construction.
4.1.4 The first step in digging the end, when soil nail wall to allow the strength of concrete after the second step
 

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