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支盘桩是在钻孔灌注桩基础上发展起来的具有较高承载力、较低变形的新型桩,随着支盘桩工程应用的增多。对支盘桩的研究也在深入,但对支盘桩及支盘受力破坏的特点探讨相对较少,尤其是对支盘破坏的可能性的研究涉及不多。此次研究中,利用现场支盘桩载荷试验资料及FLAC3D数值模拟方法对支盘桩的受力机理、桩及支盘受力变形破坏的特点进行了分析计算,得出结论在承载土层相对较硬的情况下,支盘下部土层的剪切破坏是支盘桩的主要破坏形式,对较软土层,支盘桩则为整体刺入破坏,支盘不存在被剪切破坏的可能。
The branch pile is a new type of pile with higher bearing capacity and lower deformation developed on the basis of the bored pile. With the increase of branch pile construction, The research on the branch pile is also in-depth, but there are few studies on the characteristics of the branch-pile and the branch’s force failure, especially the research on the possibility of the branch-branch failure. In this study, by using the data of on-site pile driving test and FLAC3D numerical simulation method, the stress mechanism of pile driving and driving pile, the deformation and failure of pile and support were analyzed and calculated. In the harder case, the shear failure of the soil layer below the support plate is the main failure form of the branch pile, while for the soft soil layer, the branch pile is the whole piercing failure, and the branch plate may not be damaged by shearing .