| 逆作法基坑开挖的坑底回弹规律及其对中板的影响 |
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| 引用本文： | 顾利军,王洪新. 逆作法基坑开挖的坑底回弹规律及其对中板的影响[J]. 地下工程与隧道, 2012, 0(3): 7-10,64 |
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| 作者姓名： | 顾利军 王洪新 |
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| 作者单位： | 上海城建市政工程(集团)有限公司 |
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| 摘 要： | 在上海世博会世博轴1标基坑工程中，为控制世博轴轴I标工程逆作法施工时的中板标高，采用离心模型试验研究了基坑开挖引起的坑底回弹规律；以离心模型试验为基础，采用Plaxis有限元软件研究了基坑开挖引起的坑底和立柱桩回弹规律；通过现场监测，得到了结构浇筑引起的模板沉降量值。结合以上各因素，最终确定中板的预留拱度为10～15mm，在施工中取得了良好的控制效果。
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| 关 键 词： | 基坑 坑底回弹 离心模型试验 中板标高控制 结构浇筑 模板沉降 |
Base Soil Resilience Law and its Impact on Middle Slab in Top-down Constructed Excavation Pit |
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| Gu Lijun,Wang Hongxin. Base Soil Resilience Law and its Impact on Middle Slab in Top-down Constructed Excavation Pit[J]. Underground Engineering and Tunnels, 2012, 0(3): 7-10,64 |
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| Authors: | Gu Lijun Wang Hongxin |
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| Affiliation: | Gu Lijun,Wang Hongxin |
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| Abstract: | In the top-down excavation pit engineering in the World Expo Axis Contract 1 of Shanghai World Expo Exhibition,in order to control the elevation of middle slab,the following measures were applied.First,centrifuge model test was conducted to study the base soil resilience law in excavation process;then the resilience law of base soil and column pile was analyzed by Plaxis finite element software;finally the formwork settlement induced by structure casting was monitored on site.Through the above mentioned measures,the camber of middle slab was reserved 10~15mm,which has achieved good effect in the construction. |
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