Numerical study on oblique-straight alternate piles for active support of excavations
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摘要: 随着可持续发展在岩土工程行业日益得到重视,无支撑支护技术得到了大力发展。在此基础上提出一种新型的可以有效控制基坑变形的主动式无支撑支护技术,将主动控制技术与斜直交替倾斜桩支护技术相结合,并利用FLAC3D有限差分软件建立三维模型,针对千斤顶位置、主动控制膨胀位移、主动桩倾角等因素对该技术工作性能的影响展开研究分析。结果发现,主动式控制技术可以很好地应用在斜直交替倾斜桩支护中;同时发现液压千斤顶布置于斜桩桩顶效果最佳;此外,膨胀位移的增加、主动桩倾角的增大都有利于主动控制效果的增强;此外,根据研究结果针对不同工程情况提出一些合理的建议。Abstract: With the increasing emphasis on the sustainable development in geotechnical engineering, the support technology without horizontal support has been vigorously developed. A new type of active controllable support technology without horizontal support that can effectively control the deformation of soils is put forward. The finite difference software FLAC3D is used to create 3D models, in which, the influences of factors such as jack position, expansion displacement, and inclination angle of active piles are studied and analyzed. The results show that the active control technology can be well applied to oblique-straight alternate pile support technology. At the same time, it is found that the hydraulic jack is better to be placed on the inclined pile top. In addition, the increases of expansion displacement and inclination angle of the active control piles are beneficial to the enhancement of the active control performance. Some reasonable suggestions are also proposed for different engineering situations.
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