| 上海中山医院基坑逆作法施工时间效应分析 |
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| 引用本文： | 王国粹,梁志荣,魏详.上海中山医院基坑逆作法施工时间效应分析[J].岩土力学,2014,35(Z2):495-500. |
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| 作者姓名： | 王国粹 梁志荣 魏详 |
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| 作者单位： | 现代设计集团上海申元岩土工程有限公司，上海 200040 |
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| 摘 要： | 软土具有流变性,因此,分析基坑开挖时需要考虑时间效应。逆作法施工时,由于出土条件和结构施工条件的限制,导致施工周期延长,因此,基坑施工的时间效应尤为显著。以上海中山医院工程为例,考虑软土流变效应,建立有限元模型对逆作法基坑的施工过程进行模拟,分析了施工期间各工况的围护和土体的内力与变形性状,并与实测结果进行了对比分析。结果表明,考虑土体流变的分析方法能较好的模拟逆作法施工的时间效应,并合理地反映基坑开挖过程对围护以及周边环境的影响。逆作法基坑施工过程复杂,开挖周期相对较长,应合理安排施工流程和施工速度,以达到控制围护结构及土体变形、保护周边环境的目的。
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| 关 键 词： | 基坑 逆作法 时间效应 土体流变 |
| 收稿时间： | 2014-05-08 |
Study of time effect on top-down excavation of Shanghai Zhongshan Hospital |
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| WANG Guo-cui,LIANG Zhi-rong,WEI Xiang.Study of time effect on top-down excavation of Shanghai Zhongshan Hospital[J].Rock and Soil Mechanics,2014,35(Z2):495-500. |
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| Authors: | WANG Guo-cui LIANG Zhi-rong WEI Xiang |
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| Institution: | Shenyuan Geotechnical Engineering Co., Ltd., Shanghai Xiandai Architectural Design Group, Shanghai 200040, China |
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| Abstract: | In light of the effect of soft soil rheology, the time effect of rheology should be considered in excavation analysis. Due to the excavated and structural construction conditions, construction period is prolonged, therefore time effect is particularly significant in the construction process. For the project of Shanghai Zhongshan Hospital, the finite element model is built to simulate the construction process of top-down excavation of foundation pits. The calculated displacement of diaphragm wall and soil is compared to the measured one in various operating conditions during construction. The results show that the model can reasonably reflect the impact of excavation on the structure and the surrounding environment, and rationally simulate the time effect of excavation. The construction process of top-down excavation and the excavation period is relatively long, so the construction process and the construction time should be reasonable arranged to control the deformation of structure and soil and protect the surrounding environment. |
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| Keywords: | foundation pit top-down method time effect soil rheology |
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