液压锤打桩动态过程有限元分析

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液压锤打桩过程是由多结构组成的冲击过程。对其复杂的相互作用进行动态分析，对实现液压锤打桩效果及桩的设计有着指导作用。针对锤头、锤垫、砧座、桩垫、桩与土组成的锤击系统，建立有限元模型，采用罚函数法处理接触，对工业试验进行模拟。打击软土层与持力层时，测试点应力的计算结果与实测值吻合较好，验证了模型的正确性。在此基础上，分析了不同打击层应力沿桩长和桩径的分布，得到了桩上的应力分布规律，指导桩的设计。使用持力层打击模型，就垫层弹性模量比对桩顶锤击应力的影响进行了分析，得到了垫层材料的选择依据。 The process of hydraulic hammer piling is an impact process related to many parts oi structures, lhe dynamic analysis of the complicated interactions is important to realize piling effect and guide the design of pile. Considering the hammer-blow system is composed of hammer, hammer cushion, anvil, pile cushion, pile and soil, an integrated finite element model was established, the penalty function method was adopted to deal with the contact, and the industrial test was simulated. The calculation results of the stress at the tested point, while the hammer is beating on the soft soil and the supporting layer, are in good agreement with the test results. The accuracy of the model was adopted. The stress distributions along pile and pile diameter were analyzed. By using the model of beating on the supporting layer, the impact stresses in the cushions with materials of different elastic modulus ratios were compared and the guide for choosing cushion material was presented.