| 抽真空引起周围土体竖向变形的有限元分析 |
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| 引用本文： | 艾英钵,刘加才,施建勇,雷国辉.抽真空引起周围土体竖向变形的有限元分析[J].岩土力学,2007,28(Z1):868-872. |
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| 作者姓名： | 艾英钵 刘加才 施建勇 雷国辉 |
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| 作者单位： | 1. 河海大学 岩土工程水利部重点实验室，南京 210098；2. 河海大学 岩土工程研究所，南京 210098；3. 南京工业大学，南京 210009 |
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| 摘 要： | 真空预压法加固深厚超软土地基时，一方面使地基土体产生侧向收缩变形，有利于地基的稳定；但另一方面向真空预压区的侧向变形对周围房屋、地下管线、道路等建筑物也产生不利影响，甚至会出现管道断裂、围墙倒塌、路堤被毁等严重工程事故。结合真空预压加固软基工程中出现的对周围环境影响的问题，进行了考虑土体拉裂影响的有限元分析，研究抽真空过程及加固区外不同距离、不同土体深度沉降的变化规律。研究结果表明，采用Biot固结理论、考虑土体拉裂的有限元计算结果与现场加固区外土体沉降及影响区范围的实测结果基本一致。
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| 关 键 词： | 真空预压 沉降 有限元 土体拉裂 |
| 收稿时间： | 2007-04-21 |
FEM analysis of vertical soil deformation caused by vacuum pumping |
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| AI Ying-bo,LIU Jia-cai,SHI Jian-yong,LEI Guo-hui.FEM analysis of vertical soil deformation caused by vacuum pumping[J].Rock and Soil Mechanics,2007,28(Z1):868-872. |
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| Authors: | AI Ying-bo LIU Jia-cai SHI Jian-yong LEI Guo-hui |
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| Institution: | 1. Key Laboratory for Geotechnical Engineering of Ministry of Water Resources, Hohai University, Nanjing 210098, China; 2. Geotechnical Research Institute, Hohai University, Nanjing 21098, China; 3. Nanjing University of Technology, Nanjing 210098 |
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| Abstract: | When deep and thick soft ground is improved by vacuum preloading, lateral contract deformations will be induced in the soils, and this is beneficial to ground stability. On the other hand, the lateral deformation towards the vacuum preloading area will have an adverse effect on the adjacent buildings, underground pipelines, road embankments and other structures. Serious engineering failures may take place, such as crack of the pipelines, collapse of the retaining walls, and damage of the road embankments. In order to investigate the impact of the vacuum preloading on the surrounding soils, FEM analysis has been carried out, considering the influence of soils’ tension crack. The variation behavior during the vacuum preloading process is studied on the settlement at different depths and at different distances away from the preloading area. It has been found that the calculation results from the FEM analysis based on the Biot’s theory and the consideration of tension crack are consistent with the measurement results of the settlements and the extents of the influence outside the preloading area. |
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| Keywords: | vacuum preloading settlement FEM analysis tension crack of soils |
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