锚索布置对深搅加芯桩的受力影响

发布时间：2018-06-12 09:16

本文选题：深基坑支护 + 深搅加芯桩　；参考：《昆明理工大学》2013年硕士论文

【摘要】：土层锚索深搅拌加芯属于SMW (Soil Mixing Wall)工法,是一种比较新颖、快捷的深基坑支护方法。这种新型的施工技术多应用于在软土地区的基坑支护,目前已在日本、中国等大多数城市得到了广泛的应用。该工法引入越南的时间相对较短,首次应用是在1997年应用于河内VietcomBank高层楼基坑支护及越南电力总公司的信息与管理中心高层楼基坑支护,随后于2008年越南最高的高层楼Keangnam Landmark Tower基坑支护也开始使用SMW工法施工。随着SMW工法的推广使用,在越南地区得到很多宝贵的施工经验。本文结合某实际工程实例,进一步深入探讨土层锚索分布对深搅加芯桩的受力影响,具体内容如下：本文首先总结了锚索、深搅桩支护结构的典型型式及土压力计算理论。其次结合具体工程实例采用岩土工程专用软件Plaxis(?)析不同锚索间距、超载、开挖深度对桩身弯矩、位移的影响规律。结果表明当锚索间距在3m-4m之间时桩身弯矩分布规律比较合理,并且针对不同位置的锚索,其施加的预应力值应根据实际地质情况具体考虑；随着基坑周边超载的增大,其弯矩及位移也会相应增加,施工中应严格控制周边荷载大小；基坑开挖越深则桩身弯矩及位移越大,为保证基坑的安全,在开挖过程中应做好监测工作,随时调整施工方案。
[Abstract]:The deep mixing and core-adding of soil anchor cable belongs to the SMW Soil Mixing Wall method, which is a novel and quick method for supporting deep foundation pit. This new construction technology is mostly used in foundation pit support in soft soil area and has been widely used in most cities such as Japan and China. The first application of the method was applied in 1997 to support the foundation pit of the Viet com Bank high-rise building in Hanoi and the information and management center of Vietnam Electric Power Corporation in 1997. SMW construction was followed in 2008 by Keangnam Landmark Tower, Vietnam's tallest high-rise building. With the popularization and application of SMW method, a lot of valuable construction experience has been gained in Vietnam. Combined with a practical engineering example, this paper further discusses the influence of the distribution of soil anchor cable on the stress of deep mixing pile. The concrete contents are as follows: firstly, this paper summarizes the anchor cable, Typical types of Deep mixing pile supporting structure and Earth pressure calculation Theory. Secondly, the special software Plaxis for geotechnical engineering is adopted in combination with concrete engineering examples. The influence of different cable spacing, overload and excavation depth on bending moment and displacement of pile body is analyzed. The results show that the distribution law of pile bending moment is reasonable when the spacing of anchor cable is between 3m-4m, and the applied prestress value of anchor cable in different position should be considered according to the actual geological conditions, with the increase of the overload around the foundation pit, The bending moment and displacement will increase correspondingly, and the magnitude of surrounding load should be strictly controlled in construction, and the deeper the excavation, the greater the bending moment and displacement of pile body. In order to ensure the safety of foundation pit, monitoring work should be done in the excavation process and the construction scheme should be adjusted at any time.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU473.1

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