支盘桩及支盘受力特征分析

Stress Characteristics Analysis of Squeezed Branch Pile and Plates

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。

Squeezed branch pile is a new-type pile with higher bearing capacity and lower deformation, which is developed from bored pile. Along with its application in engineering increases, the squeezed branch pile is further studied. But it is less to discuss the characteristics about the stress failure of squeezed branch pile, espe- cially the probability of squeezed branch pile failure is less studied. In the research, using the data of static loading test and the method of FL AC3D numerical simulation, the bearing mechanism of squeezed branch pile and the failure characteristics of piles and plate have been analyzed and computed, the conclusion is obtained that if the loading soil layer of squeezed branch pile is harder, the failure form of squeezed branch pile is shear failure under the plates, for the softer soil layers, the failure form of squeezed branch pile is the whole stab into break, the possibility of plate shear failure is not exist.