被动区深层搅拌桩加固对超大深基坑变形的影响

刘溢; 李镜培; 陈伟

被动区深层搅拌桩加固对超大深基坑变形的影响 English Version

刘溢^1,2,
李镜培^1,2,
陈伟³

(1.同济大学土木工程学院地下建筑与工程系，上海 200092；2. 同济大学岩土及地下工程教育部重点实验室，上海 200092；3. 上海陆家嘴金融贸易区开发股份有限公司，上海 200127)

详细信息

作者简介:
刘溢(1988– )，男，江苏武进人，硕士研究生，从事岩土工程研究工作。

中图分类号: TU47
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出版历程
- 收稿日期: 2012-11-12
- 发布日期: 2012-11-12

Effect of reinforcement of deep mixing piles on deformation of ultra-deep excavations in passive zone

(1. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China; 2. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China; 3. Shanghai Lujiazui Finance and Trade Zone Development Co., Ltd., Shanghai 200127, China)

摘要

摘要: 选取不同加固土体参数，采用土体卸载条件下的HS(hardening-soil)有限元模型，分析了被动区加固对超大深基坑变形的影响。结果表明：深搅加固对墙体侧向位移的影响随深度增加而增大，可以最终减小墙体侧向位移达27%左右；在临近墙体局部范围内抑制坑底隆起效果显著，抑制隆起量最多超过50%；对墙背土体沉降抑制显著，局部降低60%左右。因此，根据不同地质条件和基坑变形控制要求，选择合理的加固形式使加固土体达到设计强度，既能保证基坑安全和环境影响的要求，又能节省造价。
- 超大深基坑 /
- 被动区加固 /
- 深搅桩 /
- HS模型
Abstract: By selecting different parameters of reinforced soil and adopting hardening-soil finite element model based on unloading, the influence of bottom soil on deformation of excavations is studied. The results show that the reinforcing influence on lateral deformation increases with the increase of the excavation depth, and the final lateral deformation can be reduced by 27%. This effect is prominent for controlling the uplift in bottom soil around retaining structures, and the utmost inhibition of uplift may exceed 50%. The influence of reinforcement on soil settlement behind the retaining structures is conspicuous, about 60% in local zone. Therefore, selecting a rational reinforcing form based on different geological conditions and deformation requirements is needed to make the reinforced soil intensity reach the design demand, which can guarantee the excavation safety and environment impact and save the engineering cost.
- ultra-deep excavation /
- passive zone reinforcement /
- deep mixing pile /
- HS model

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参考文献(12)

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