钻孔灌注桩与施工土体受力作用有限元分析

Finite Element Analysis on Force Effect of Bored Cast-in-Situ Pile and Surrounding Soil

钻孔灌注桩在实际工程中具有良好的性能优势和应用前景,其在施工过程中与影响土体相互作用关系的量化研究对其技术发展有重要作用。本文在实际工程背景下,选用简化桩体和土体模型,采用有限元软件对两者施工相互作用的主要力学性能指标进行分析,评价桩基施工安全性,并将与工程实际情况吻合的模拟结果进行参数扩展分析,描述桩径、桩长、材料弹性模型等关键指标对模型整体力学性能的影响。计算结果表明,桩体尺寸和材料特性对土体最大应力和位移影响明显,而土体材性变化对整体力学性能影响较小。

Since bored cast-in-place piles have good mechanical performance and promising application prospect in practical engineering,the quantitative study on its interaction with soil in the construction process is significant for the development of its technology.In this paper,the simplified pile and soil models were used to analyze the main mechanical properties of the construction interaction between the two,and the construction safety of the pile foundation was evaluated.The simulation results in accordance with actual projects were developed to describe the influence of the key indexes such as pile diameters,pile lengths and material elastic moduli on the overall mechanical properties of the model.The calculation results show that the dimensions and material properties of piles have obvious influence on the maximum stress and displacement of soil,while the variation of soil properties has little effect on the overall mechanical properties.