高频液压振动锤打桩有限元方法分析

Finite Element Analysis of vibratory driving with high frequency hydraulic vibratory hammer

高频液压振动锤的使用在国外已经很普遍了,在国内也慢慢的推广开来,但是对高频振动锤的沉桩理论的研究还是落后于其实际应用。以前的研究主要集中在试验方面,在此基于PLAXIS 8.2岩土工程分析软件的动力模块分析高频振动锤打桩相关问题,主要对沉桩的位移、振动沉桩的应力场、超孔隙水压力的分布做简要的动力分析。分析表明超孔隙水压力的产生对振动沉桩起到一个很重要的影响,特别是无粘性土层中,如果桩周土体能产生振动液化,那么就能加快沉桩速度,提高施工效率。

High frequency hydraulic vibratory hammer, which is popular in foreign countries, has been used in our country recently. But the theories of vibratory hammer is lacking. The former research is focused on the experimental work and empirical examination. In this paper geoteehnique analysis software PLAXIS 8.2 is used to analyze problem about vibratory pile driving. Displacement of pile, state of stress and excess pore pressure are considered. The excess pore pressure effects the pile driving largely. If liquefaction is developed, the velocity of pile driving and efficiency of construction is increased.