斜桩施打过程中锤击能折减因素分析

针对施打斜桩时折减后的锤击能量与实际值相差过大的问题，对液压打桩锤的锤击原理和折减因素进行分析，得出锤击能量损失及桩身的侧摩阻力增加的影响因素，并推导出倾斜锤击工况下的主动能量损失及桩身与岩土作用下的被动阻力增量的计算公式，并将计算结果与工程实际相比较。结果表明，本文公式的计算结果能较好地反映工程实际，可为类似工程提供参考。

Analysis on reduction factor of hammering energy in process of driving sloping pile

Aiming at the problem that the reduced hammering energy is excessively different from the actual value when driving sloping pile,we analyze the hammering principle and reducing factors of hydraulic pile driving hammer,obtain the factors affecting energy loss of hammering and increase of side friction resistance of pile,deduce the formulas for calculating active energy loss and passive resistance increment under inclined hammering,and compare the calculation results with the engineering practice.The results show that the calculation results of the formula in this paper can better reflect the engineering practice,and can provide references for the similar projects.