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利用有限元软件COMSOL自定义模块功能,将建立的水热力三场顺序耦合模型导入,模拟二维轴对称条件下多种螺旋桩在土体冻结过程中发生的冻拔,并设置光滑桩作对比.在冻深达到桩长全长时,全螺旋小叶片桩具有良好的抗冻拔效果(仅为光滑桩的19.5%).使用COMSOL内嵌热应力模块,模拟三维条件下螺旋桩抗冻拔过程,并与室内试验结果作对比.结果显示冻深只有桩长一半时,双螺旋小叶片桩明显减少桩体冻拔量.表明:通过数值分析可比选出抗冻拔的最优桩型,对于现场试验的光伏支架螺旋桩型设计提供参考.
By using the COMSOL custom module function, finite element software COMSOL was used to import the coupled three-field hydrothermal model to simulate the freezing and thawing of many screw piles in the soil freezing process under the condition of two-dimensional axisymmetry, and to set the comparison of the smooth piles When the depth of the pile reaches the full length of the pile, the full spiral small leaf pile has a good anti-freezing effect (only 19.5% of the smooth pile). COMSOL embedded thermal stress module, simulated three-dimensional screw pile anti- The results show that when the length of the frozen soil is only half of the length of the pile, the double helixlet leaflet pile significantly reduces the amount of freezing and thawing of the pile body, which shows that the optimal pile type of anti-freezing extraction can be selected by numerical analysis, For the field test of photovoltaic stent screw pile design reference.